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Rion NA-28 Instruction Manual

Other manuals for NA-28: Instruction Manual

Summary of NA-28

  • Page 1

    3-20-41 higashimotomachi, kokubunji, tokyo 185-8533, japan http://www.Rion.Co.Jp/english/ instruction manual sound level meter na-28.

  • Page 3

    I organization of the na-28 documentation documentation for the sound level meter na-28 comes in three parts, as listed below. Instruction manual (this document) describes operating procedures for the sound level meter na-28, connec- tion and use of peripheral equipment such as a level recorder and ...

  • Page 4

    Ii.

  • Page 5

    Iii organization of this manual this manual describes the features, operation and other aspects of the sound level meter na-28 (with 1/3 octave analysis function). If the unit is used together with other equipment to confi gure a measurement system, consult the documentation of all other components ...

  • Page 6

    Iv memory card explains how to use a memory card with the unit. Input/output connectors explains the input and output connectors of the unit. Default settings lists the factory default settings of the unit. Setup file explains how to start up the unit using settings saved in a setup fi le. Optional ...

  • Page 7: Caution

    V for safety in this manual, important safety instructions are specially marked as shown below. To prevent the risk of death or injury to persons and severe damage to the unit or peripheral equipment, make sure that all instructions are fully understood and observed. Caution important d isr ega r d ...

  • Page 8

    Vi.

  • Page 9: Quantifi Er Notation

    Vii quantifi er notation (sound level and sound pressure level are expressed uniformly as sound pres- sure level, distinguished by the use of frequency weighting.) measurement value the time weighting characteristics f, s, 10 ms i l p sound pressure level a-weighted sound pressure level l af , l as ...

  • Page 10

    Viii.

  • Page 11

    Ix quantifi er notation of sound level meter na-28 according to international standards and jis (excerpts from iso 1996, 3891, iec 61672-1, jis z 8202, 8731) na-28 notation description frequency weighting iso notation iec notation jis notation l z sound level z l p — l p l a a-weighted sound level a...

  • Page 12

    X.

  • Page 13: Precautions

    Xi precautions operate the unit only as described in this manual. The na-28 is a precision instrument. Protect it from shocks and vibrations. Take special care not to touch the microphone diaphragm. The diaphragm is a very thin metal fi lm which can easily be damaged. Use only the microphone/preampl...

  • Page 14

    Xii to ensure continued accuracy, have the unit checked and serviced at regular intervals. Contact the supplier. Dispose of the unit and of batteries only according to national and local regulations at the place of use. This product can be used in any areas including residential areas. To conform to...

  • Page 15

    Xiii contents organization of the na-28 documentation ..................................... I organization of this manual ........................................................ Iii outline ............................................................................................1 controls and fu...

  • Page 16

    Xiv power on/off ................................................................................38 to turn the unit on ...................................................................38 to turn the unit off ..................................................................39 power-on mode .........

  • Page 17

    Xv store operation .............................................................................86 inserting and removing the cf card ......................................88 manual ....................................................................................89 auto1 ............................

  • Page 18

    Xvi.

  • Page 19: Outline

    1 outline the sound level meter na-28 allows octave and 1/3 octave band analysis in real time. It conforms to legal requirements for quantity measurements and to jis and iec standards. It supports diffuse sound fi eld measurements and also meets standard requirements when the supplied windscreen is ...

  • Page 20

    2 outline the sound level meter na-28 allows the following quantity measure- ments. Main processing (sound level meter mode, analyzer mode) simultaneous measurement of all items with selected time weighting and frequency weighting characteristics sound level l p equivalent continuous sound level l e...

  • Page 21: Controls And Functions

    3 controls and functions front view microphone/preamplifi er the microphone/preamplifi er unit can be detached from the main unit and connected via an optional extension cable. This allows use at a separate location. Be sure to use only the microphone/preamplifi er assembly with the number as shown ...

  • Page 22: Operation Key Panel

    4 controls and functions operation key panel start/stop key press to start or stop the measurement (including the various processing functions). Store key serves to start the auto store process or to perform manual store for en- tering data into the memory. Mode key switches the processing mode. Eac...

  • Page 23

    5 controls and functions level keys (level range switching keys) serve for selecting the level range for measurement. In sound level meter mode, the following six settings are available. 20 to 80, 20 to 90, 20 to 100, 20 to 110, 20 to 120, 30 to 130 db in analyzer mode, the following six settings ar...

  • Page 24: Memory Card Slot Cover

    6 controls and functions light key this key turns on the display backlight, for easier reading in a dark loca- tion. Press the key again to turn the backlight off. When the automatic light out function was selected from the menu, the backlight will turn itself off automatically after the preset time...

  • Page 25: Bottom View

    7 controls and functions bottom view cover this cover protects the connectors on the bottom during transport or stor- age. Removing the cover gives access to the connectors shown above. External power supply jack the supplied ac adapter nc-94b can be connected here for powering the unit from an ac o...

  • Page 26: Rear View

    8 controls and functions rear view name plate shows various information including model number of the unit, microphone number, preamplifi er number, serial number, and date of manufacture. Tripod mounting thread the unit can be mounted on a camera tripod using this thread. Battery compartment four b...

  • Page 27: Preparations

    9 preparations power the na-28 can be powered by four iec r14, size c batteries (alkaline or manganese), the supplied ac adapter nc-94b. Rechargeable batteries may also be used, but the na-28 does not have a facility for charging the batteries. Note when the ac adapter is connected, the unit will be...

  • Page 28: Important

    10 preparations important take care not to reverse the (+) and (-) polarity when inserting the batteries. Always replace all four batteries together. To prevent the risk of damage, do not mix old and new batteries or batteries of different type. To prevent the risk of battery fl uid leakage, re- mov...

  • Page 29: Ac Adapter

    11 preparations dc 5-6v trig in/ comp out ac dc output usb external power supply jack ac adapter nc-94b to ac outlet, 100 to 240 v ac, 50/60 hz open cover on bottom ac adapter connect the ac adapter as shown below. Important to prevent the risk of damage, do not use any ac adapter other than the nc-...

  • Page 30: Windscreen (Ws-10)

    12 preparations windscreen (ws-10) when making outdoor measurements in windy weather or when measuring air conditioning equipment or similar, wind noise at the microphone can cause measurement errors. Such effects can be reduced by using the wind- screen ws-10. When using the windscreen, set the win...

  • Page 31: Diffuse Field Correction

    13 preparations diffuse field correction when using the unit as an ansi compliant device, set the diffuse fi eld cor- rection to on. This compensation feature is designed to ensure fl at frequency response in a diffuse sound fi eld. 1. Select [measurement] from the menu list and press the ent key. 2...

  • Page 32: Inserting A Card

    14 preparations memory cards (cf card) and program cards measurement data can be stored on a memory card for use and further pro- cessing in a computer. Optional program cards can also be used for loading software into the na-28 to expand the measurement functions of the unit. Inserting a card impor...

  • Page 33: Important

    15 preparations microphone extension cables (ec-04 series) be sure to turn power to the unit off before separating the microphone from the main unit. To reduce measurement deviations due to refraction effects and the acoustic infl uence of the operator, the microphone can be detached from the unit a...

  • Page 34

    16 preparations 2. Connect the extension cable to the preamplifi er and to the main unit and fasten the connectors with the fastening screw. 3. When mounting the microphone on a tripod, fi rst fasten the micro- phone holder (supplied with the extension cable) to the tripod. Then insert the extension...

  • Page 35

    17 preparations connection to a printer (bl-112ui) (bl-112ui was discontinued in 2010.) the usb port on the bottom of the unit can be used for connection to a usb printer, using the optional printer connection cable cc-97. Connection to a level recorder (lr-07, lr-20a) sound level recording connect ...

  • Page 36: Connection To A Computer

    18 preparations connection to a computer the usb port on the bottom of the unit can be used for connection to the usb port of a computer, using the generic a male - mini b male usb cable. A memory card inserted in the unit will be recognized as a removable disk by the computer when connected via usb...

  • Page 37: Setting The Date and Time

    19 preparations setting the date and time the na-28 incorporates a clock which allows recording the date and time along with measurement data. Set the date and time as described below. 1. Press the power key to turn the unit on. 2. Press the menu key. The menu list screen appears on the display. 3. ...

  • Page 38

    20 preparations note an internal rechargeable backup battery serves to keep clock setting on the unit. The backup battery is automatically charged by the main batteries, but the retention period for clock setting depends on charging time (see page 11). Full charge of the backup battery requires appr...

  • Page 39

    21 preparations measurement in a dark location pressing the light key will turn on the display backlight, for easier read- ing in a dark location. The backlight operation pattern can be controlled via a menu, as follows. 1. Press the menu key to bring up the menu list screen. 2. Use the keys to sele...

  • Page 40: Sub Channel Settings

    22 preparations sub channel settings to use the sub channel, you must make certain settings on a menu screen. 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [measurement] and press the ent key. The measurement menu screen appears. 3. Use the keys to select [sub cha...

  • Page 41: Trigger Mode Settings

    23 preparations trigger mode settings the na-28 offers a trigger mode whereby measurement is initiated by one of three kinds of trigger: time trigger (time-controlled triggering), level trig- ger (sound level controlled triggering), and external trigger (triggering by an external signal). Time trigg...

  • Page 42: Time Trigger Setting

    24 preparations time trigger setting for auto1 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [store] and press the ent key. 3. Use the keys to select [store mode] and press the ent key. 4. Use the keys to select [auto1] and press the ent key. 5. Press the menu key...

  • Page 43

    25 preparations for auto2 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [store] and press the ent key. 3. Use the keys to select [store mode] and press the ent key. 4. Use the keys to select [auto2] and press the ent key. 5. Press the menu key to bring up the menu...

  • Page 44: Sleep Mode

    26 preparations sleep mode if time trigger has been selected for the auto1 or auto2 mode, you can enable sleep mode (power-saving standby mode). When sleep mode is enabled, the unit will enter a power-saving standby condition before the measurement is started and during intervals between measurement...

  • Page 45

    27 preparations measurement - trigger menu screen select "time" as trigger mode set sleep mode to on measurement - trigger menu screen in the measurement standby condition, the indicator led fl ashes in blue using the following pattern. 0.1 second intervals 5 seconds lit out lit lit out lit note whe...

  • Page 46: Level Trigger Setting

    28 preparations level trigger setting 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [measurement] and press the ent key. 3. Use the keys to select [trigger mode] and press the ent key. 4. The measurement-trigger menu screen is shown. Select [trigger mode] again an...

  • Page 47: External Trigger Setting

    29 preparations external trigger setting 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [measurement] and press the ent key. 3. Use the keys to select [trigger mode] and press the ent key. 4. The measurement-trigger menu screen is shown. Select [trigger mode] again...

  • Page 48: Comparator Output

    30 preparations comparator output this is an open collector output that can be used to control external equip- ment. 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [i/o(input/output)] and press the ent key. 3. The input/output menu screen is shown. Use the keys to ...

  • Page 49: Comparator Band

    31 preparations comparator band use the keys to select [comparator band] and press the ent key. The following menu appears. Use the keys to set the band, and press the ent key. When the keys are kept pressing, the band values are fast-forwarded. I/o - comparator menu screen.

  • Page 50: About The Comparator Output

    32 preparations about the comparator output when the sub channel is off, the comparator will not function if sub chan- nel is selected as comparator band. Similarly, if analyzer mode is set for simultaneous analysis of octave and 1/3 octave bands, and 16 khz or 20 khz is selected as comparator band,...

  • Page 51: Language Selection

    33 preparations language selection the language used for displaying messages and menus can be selected as follows. 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [system (language)] and press the ent key. 3. The system menu screen appears. Use the keys to select [l...

  • Page 52: Calibration

    34 calibration before starting a measurement, the na-28 must be calibrated. There are two types of calibration, namely electrical calibration using an internally gener- ated signal and acoustic calibration using an external sound calibrator. Electrical calibration calibration is carried out using a ...

  • Page 53

    35 calibration signal output for calibration of external equipment the normal level range setting for calibration is scale upper limit 120 db, but for calibration of external equipment, another level range setting can also be chosen. In this case, ''xx db'' fl ashes on the calibration value indicati...

  • Page 54: Important

    36 calibration acoustic calibration with sound calibrator nc-74 for acoustic calibration, a sound calibrator is mounted to the microphone of the sound level meter, and adjustment is performed so that the reading of the meter is equal to the sound pressure level inside the coupler. 1. Turn off the so...

  • Page 55

    37 calibration 8. Press the cal key. If ''internal calibration'' is shown under the bar graph, press the store key. The indication will change to ''acoustic calibration''. 9. Use the keys to adjust the reading of the na-28 to the value shown below. Sound calibrator nc-74: 94.0 db 10. Press the cal k...

  • Page 56: Power On/off

    38 power on/off to turn the unit on hold down the power key until the power-on screen (mosaic pattern rion logo mark) appears (at least 1 second). When the screen is shown, release the power key. After the unit has been started, the measurement screen appears. During start up, the indicator led fl a...

  • Page 57: To Turn The Unit Off

    39 power on/off to turn the unit off hold down the power key until the unit is turned off (several seconds). When the power-off screen appears, release the power key. Note after turning the unit off, wait at least 10 seconds before turning it on again. If the key lock has been activated, pressing th...

  • Page 58: Reading The Display

    40 reading the display sound level meter display the illustration below shows all elements of the display for explanation pur- poses. In actual operation, such a screen will not be shown, and the size and font of the actual display may be slightly different. Comparator on/comparator level when the c...

  • Page 59

    41 reading the display store mode shows the selected mode for storing data in memory (manual, auto1, or auto2). Level range shows the upper and lower limit of the bar graph. Can be switched with the level keys. Bar graph shows the sound level as a bar graph indication. (the display is updated every ...

  • Page 60

    42 reading the display main channel level display shows the measured sound level in the main channel. (the display is updated every second.) sub channel level display shows the measured sound level in the sub channel. (the display is up- dated every second.) current date and time shows the current d...

  • Page 61

    43 reading the display sub channel time weighting indicates the sub channel time weighting characteristic. F: fast, s: slow, : 10 ms, i: impulse the sub channel time weighting characteristic is set from a menu. Sub channel frequency weighting indicates the sub channel frequency weighting characteris...

  • Page 62

    44 reading the display mode of analysis indicates the condition of the display screen. Slm: sound level meter display oct.: octave band analysis screen 1/3oct.: 1/3 octave band analysis screen oct&1/3oct: simultaneous octave and 1/3 octave band analysis screen windscreen correction [ ws off ] symbol...

  • Page 63: Analysis Screen

    45 reading the display analysis screen an example for the oct & 1/3 oct analysis screen is shown below. Use the and keys of the keys to move the cursor to the target frequency. T-l (time/level) display screen an example for the 1/3 oct. Analysis screen is shown below. Cursor frequency and level at c...

  • Page 64: Numeric Display Screen

    46 reading the display numeric display screen examples for oct., 1/3 oct., and oct & 1/3 oct analysis screens are shown below. Numeric display (oct) screen numeric display (1/3 oct) screen numeric display (oct, 1/3 oct) screen frequencies that are currently not displayed can be called up with the / ...

  • Page 65: Indicator Messages

    47 reading the display indicator messages when keys such as start/stop or store are pressed, indicator messages such as shown below will appear on the display for about 1 second. When start/stop key was pressed and processing has started when store key was pressed (store address is also shown) when ...

  • Page 66: Menu List Screen

    48 reading the display menu list screen pressing the menu key brings up the menu list screen as shown below. Use the keys to select the desired menu and press the ent key. System use the keys to select [system] and press the ent key. The sys- tem menu comes up. Cf card format off/exec. (can only be ...

  • Page 67

    49 reading the display read/save setting bring the cursor to [read/save setting] and press the ent key. The [system - setting] screen appears. / / / keys to select the item and press the ent key. Use the [system - settings - save] screen appears. Return menu / / / keys to select the item and press t...

  • Page 68

    50 reading the display time setting bring the cursor to [time setting] and press the ent key. The [system - time setting] screen appears. Program information bring the cursor to [program information] and press the ent key. The [system - program information] screen appears. Language /english/deutsch/...

  • Page 69: Display

    51 reading the display display use the keys to select [display] and press the ent key. The display menu screen appears. Max hold on/off (can be selected in analyzer mode) leq on/off le on/off lmax on/off lmin on/off ln1 (l01 to l99) on/off ln2 (l01 to l99) on/off ln3 (l01 to l99) on/off ln4 (l01 to ...

  • Page 70: I/o (Input/output)

    52 reading the display i/o (input/output) use the keys to select [i/o (input/output)] and press the ent key. The input/output menu screen appears. Ac out off/main/sub dc out off/main/sub comparator on/off usb communication on/off remote control on/off backlight brightness dark/bright backlight auto-...

  • Page 71

    53 reading the display comparator next menu level use the keys to move the cursor to [comparator] and press the ent key. The following next menu level appears. Comparator on/off comparator level 25 to 130 db (1-db steps) comparator band sub ap/main ap/12.5 hz/16 hz/20 hz/25 hz ... 20 khz (1/3 octave...

  • Page 72: Store

    54 reading the display store use the keys to select [store] and press the ent key. The store menu appears. Store mode manual/auto1/auto2 store name man_**** au1_**** au2_**** **** is a 4-digit number from 0000 to 9999 store name is settable when cf card is inserted. Sampling period (slm/rta) (only s...

  • Page 73: Measurement

    55 reading the display measurement use the keys to select [measurement] and press the ent key. The measurement menu appears. Wind screen correction on/off measurement time auto1: 1 s to 1000 h auto2 or normal measurement: 1 s to 24 h back-erase off/5 s delay time 0 to 10 s lmax/lmin type band/ap/ap(...

  • Page 74

    56 reading the display trigger mode next menu level use the keys to select [trigger mode] and press the ent key. The following next menu level appears. Available trigger mode settings are level 1, level 2, time, and ext. Level 1 setting items trigger level 25 to 130 db, 1-db steps trigger band main ...

  • Page 75

    57 reading the display sub channel next menu level use the keys to select [sub channel] and press the ent key. The following next menu level appears. Measurement-sub channel menu screen measurement-sub channel.

  • Page 76: Print

    58 reading the display printing screen print use the keys to select [print] and press the ent key. The print menu screen appears. At the recall screen, it is possible to select a range for simultaneous printing of data for multiple addresses. However, the print format will depend on the screen that ...

  • Page 77: Recall

    59 reading the display recall use the keys to select [recall] and press the ent key. The select file menu appears. Select file menu screen.

  • Page 78

    60 reading the display menu list items system cf card format read/save settings [v]---------- load default group save for cf card [v]---------------- list of setting groups on cf card group loading/delete for cf card [v]---- list of setting groups on cf card time setting ----------------year/month/d...

  • Page 79: Measurement

    61 measurement when using the na-28 in a mode other than "sound level measurement", all processing functions provided by the unit ( l eq , l e , l max , l min , l n ) are car- ried out simultaneously. (however, for the sub channel, only the additional processing function set to "on" in the menu scre...

  • Page 80

    62 measurement 2. Use the freq weight key to select the frequency weighting characteristic. For normal sound level measurements, select the "a" setting. When l z (flat) is selected for display, the sound pressure level from 10 hz to 20 khz is measured with fl at characteristics. When l c is selected...

  • Page 81: Important

    63 measurement important during sound level measurement, do not press the mode key. Otherwise other processing results will be shown. The sound level is being displayed when there is no character string after the basic indication. Laf: sound level is being displayed laeq: sound level is not being di...

  • Page 82: ) Measurement

    64 measurement equivalent continuous sound level (l aeq ) measurement the procedure for equivalent continuous sound level measurement is de- scribed below. Preparations as described in the "preparations" chapter must be completed fi rst. 1. Turn power to the unit on. 2. Use the freq weight key to se...

  • Page 83

    65 measurement grp num menu slm rta ent cal light power + 1 2 start/stop store mode pause/cont - level 4 3 freq weight time start/stop key level power key freq weight/ time weight keys menu key ent key mode key indicator led / / / keys / keys 6. Set the measurement time from the menu. Press the menu...

  • Page 84

    66 measurement display menu screen set leq to on 10. Press the menu key to return to the menu list screen and use the keys to select [display]. Press the ent key. The display menu screen appears. 11. Use the keys to select [leq] and press the ent key. 12. Use the keys to select on and press the ent ...

  • Page 85: Important

    67 measurement 14. Press the start/stop key to start the measurement. At this point, previous measurement values are cleared. While the measurement is in progress, the symbol fl ashes and the elapsed time is displayed. When the measurement time set in step 9 has elapsed, the measurement is terminate...

  • Page 86

    68 measurement if the back-erase function was enabled in steps 7 and 8, using the time-level screen is convenient. Data excluded by the back-erase function are indicated on the display as follows. Time-level screen data excluded by back-erase function (on, 5 s) 15. When the measurement is completed,...

  • Page 87: Sound Exposure Level (L

    69 measurement sound exposure level (l ae ) measurement the procedure for sound exposure level measurement is similar to that for equiva- lent continuous sound level measurement, but the menu item selection differs. Preparations as described in the "preparations" chapter must be completed fi rst. 1....

  • Page 88: Important

    70 measurement during measurement, the pause/cont key can be used to pause and resume the measurement. During pause, the pause symbol ( ) is shown. (the paused interval and the back-erase interval are not included in the measurement time.) important during measurement, the level keys, freq weight ke...

  • Page 89: Maximum Sound Level (L

    71 measurement maximum sound level (l max ) and minimum sound level (l min ) measurement the procedure for maximum sound level and minimum sound level measure- ment is similar to that for equivalent continuous sound level measurement, but the menu item selection differs. Preparations as described in...

  • Page 90: Important

    72 measurement 9. Press the start/stop key to start the measurement. While the measurement is in progress, the symbol fl ashes and the elapsed time is displayed. When the preset measurement time has elapsed, the measurement is terminated automatically. To terminate the measurement before the allocat...

  • Page 91

    73 measurement note during measurement, you can use the mode key to check the equivalent continuous sound level as cur- rently calculated. (this applies only to the numeric level display. The bar graph shows the sound level.) after the measurement is completed, changing the frequency weighting (a/c/...

  • Page 92: Selecting The L

    74 measurement measurement menu screen select lmax/lmin type press ent key select band/ap/ap(s) press ent key selecting the l max /l min type band (band maximum/band minimum): the analysis result applies to the point where the level for each frequency band was maximum or minimum within the sampling ...

  • Page 93: Percentile Sound Level (L

    75 measurement percentile sound level (l n ) measurement the procedure for percentile sound level measurement is similar to that for equiva- lent continuous sound level measurement, but the menu item selection differs. Preparations as described in the "preparations" chapter must be completed fi rst....

  • Page 94: Important

    76 measurement 6. Press the start/stop key to start the measurement. While the measurement is in progress, the symbol fl ashes and the elapsed time is displayed. When the preset measurement time has elapsed, the measurement is terminated automatically. To terminate the measurement before the allocat...

  • Page 95

    77 measurement note during measurement, you can use the mode key to check the equivalent continuous sound level as currently calculated. (this applies only to the nu- meric level display. The bar graph shows the sound level.) after the measurement is completed, changing the frequency weighting (a/c/...

  • Page 96: , L

    78 measurement additional processing value (l peak , l atm5 ) measurement when the na-28 is in sound level meter mode and the sub channel is on, one of the following processing functions is available in addition to l eq , l e , l max , l min , and l n . L peak : peak sound level l atm5 : time-weight...

  • Page 97: Important

    79 measurement 6. Use the keys to select [sub channel] and press the ent key. 7. Use the keys to select [ l peak / l tm5 ] and press the ent key or key. Use the keys to select l peak or l tm5 and press the ent key. 8. Press the start/stop key to return to the measurement screen. 9. Use the level key...

  • Page 98: Important

    80 measurement important l ai is the time-weighted sound level. Processing for this value begins when the start/stop key is pressed, and the display is updated ac- cordingly. The display will not be updated when processing has stopped. Therefore using the manual mode is recommended for l ai . Note d...

  • Page 99

    81 measurement 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [measurement] and press the ent key. The measurement menu screen appears. 3. Use the keys to select [back erase] and press the ent key. The indication "5 s/off" appears. 4. Use the keys to select "5 s" a...

  • Page 100: Marker

    82 measurement marker during processing of l eq and other values, it is possible to add markers to the data. 1. Select the store mode on the menu list screen. Also set the required measurement parameters such as frequency weighting and time weighting. 2. Press the start/stop key to set the unit to t...

  • Page 101: Max Hold

    83 measurement max hold this function retains the maximum value for one second, for easier reading of the changing bar graph indication. Max hold level is shown only on the analysis screen. 1. Press the menu key to bring up the menu list screen. 2. Select [display] to bring up the display menu scree...

  • Page 102: Delayed Measurement

    84 measurement delayed measurement the na-28 allows setting a delay time to be inserted before the actual start of the measurement. 1. Press the menu key to bring up the menu list screen. 2. Select [measurement] and press the ent key to bring up the mea- surement menu screen. 3. Select [delay time] ...

  • Page 103

    85 measurement when the trigger function is also used, the start of measurement will be delayed by the preset delay time from the trigger event point. When a delay time has been set, the na-28 will operate as follows. When the start/stop key is pressed, the measurement standby symbol starts to fl as...

  • Page 104: Store Operation

    86 store operation the na-28 can store measurement data (processed data such as sound level and equivalent continuous sound level, and measurement parameters such as frequency weighting and time weighting characteristics) in the internal memory or on cf card. This chapter describes how to store data...

  • Page 105: Auto2

    87 store operation analyzer mode continuous store of sound level l p values for each band and all-pass main channel: all-pass value and band level values sub channel: all-pass value sampling cycle: 1 ms to 1 sec, l eq,1s internal memory: max. 10000 data (2.7 hours for 1 sec or l eq,1s ) auto2 sound ...

  • Page 106

    88 store operation inserting and removing the cf card insert or remove the cf card as shown below. Note be sure to turn power off before inserting or re- moving a card. 1. Slide 2. Lift 1 2 cf card card slot lever (push to remove card) engage this section with your nail to open the cover. Front side...

  • Page 107: Manual

    89 store operation manual memory store at the point where the store key is pressed, the current sound level and processing values are stored. Immediately after turning power on, there will be no processing values, therefore only the sound level is stored when the store key is pressed. If no cf card ...

  • Page 108

    90 store operation 5. Use the keys to select [manual] and press the ent key. 6. Specify the store name (when cf card is inserted). 6-1. Use the keys to select [store name] and press the ent key. 6-2. Use the keys to specify the fi rst two digits and press the ent key. 6-3. Press the ent key or the k...

  • Page 109

    91 store operation 9. Specify the store address. The currently selected address is shown on the screen. If the address is shown in red, it already contains data. Take care not to overwrite data that you want to keep. The keys can be used to specify the address in the range from 0001 to 1000. Any dat...

  • Page 110: Important

    92 store operation important any measurement data present in the currently displayed address will be overwritten. If the address is shown in red, it contains data. Take care not to accidentally overwrite data. Note when address 1000 is reached, it will be overwrit- ten without confi rmation. When th...

  • Page 111

    93 store operation start/stop key power key menu key ent key mode key grp/num key / / / keys select store name with and press ent key / keys recall screen, sound level meter mode recall screen, analyzer mode.

  • Page 112: Erasing Stored Data

    94 store operation erasing stored data to erase data stored in manual mode, proceed as follows. Note data are erased in store name units. It is not possible to selectively erase data for a specifi c address. 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [recall] a...

  • Page 113: Auto1

    95 store operation auto1 memory store if no cf card is inserted, the data will be stored in the internal memory of the na-28. If a cf card is inserted, the data will automatically be stored on the card. Storing data on cf card is recommended. Sound level meter mode l p , l eq , l max , l min of main...

  • Page 114

    96 store operation 5. Specify the store name (when cf card is inserted). 5-1. Use the keys to select [store name] and press the ent key. 5-2. Use the keys to specify the fi rst two digits and press the ent key. 5-3. Press the ent key or the key to move to the next two digits. 5-4. Use the keys to sp...

  • Page 115: Important

    97 store operation 9. Press the store key to start the measurement. Important during measurement, only the start/stop key, pause/cont key, light key, store key, mode key and power key are operative. Other keys such as the freq weight key and time weight key have no effect. Be sure to complete all se...

  • Page 116: Recalling Stored Data

    98 store operation recalling stored data the procedure for recalling data stored in memory is described below. 1. Turn power to the unit on. 2. Press the menu key to bring up the menu list screen. 3. Use the keys to select [recall] and press the ent key. The fi le selection menu appears. 4. Use the ...

  • Page 117

    99 store operation recall screen, sound level meter mode recall screen, analyzer mode.

  • Page 118: Erasing Stored Data

    100 store operation erasing stored data to erase stored data, proceed as follows. 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [recall] and press the ent key. 3. The fi le selection screen appears and stored data are displayed. Use the keys to select the data tha...

  • Page 119: Auto2

    101 store operation auto2 memory store if no cf card is inserted, the data will be stored in the internal memory of the na-28. If a cf card is inserted, the data will automatically be stored on the card. Storing data on cf card is recommended. Sound level meter mode continuous store of main channel ...

  • Page 120

    102 store operation 5. Specify the store name (when cf card is inserted). 5-1. Use the keys to select [store name] and press the ent key. 5-2. Use the keys to specify the fi rst two digits and press the ent key. 5-3. Press the ent key or the key to move to the next two digits. 5-4. Use the keys to s...

  • Page 121: Recalling Stored Data

    103 store operation measurement menu screen time trigger menu screen measurement start time (trigger start time) trigger interval measurement end time (trigger end time) measurement time measurement interval measurement time measurement interval note during auto2 store, the pause function cannot be ...

  • Page 122: Screen Hard Copy

    104 store operation screen hard copy when you press the level key while holding down the menu key, the current screen contents will be saved as a bitmap fi le on the cf card. Store target folder: \screenshot\ file name: time at which the fi le was stored file name extension: .Bmp.

  • Page 123: Memory Card

    105 memory card using a memory card open the cover of the memory card slot and insert a cf card. To remove the card, push the lever so that the card pops out. Important make sure that power is off before inserting or removing a card. 1. Slide in arrow direction 2. Lift 1 2 cf card card slot lever (p...

  • Page 124: Data Size Information

    106 memory card data size information when using manual store the approximate number of data sets that can be stored on a 128 mb memory card is as follows. Sizes per one data (byte) number of data slm mode 1330 55000 oct. Mode 2059 28000 1/3 oct. Mode 3541 28000 oct & 1/3 oct mode 4291 18000 for exa...

  • Page 125: When Using Auto2 Store

    107 memory card when using auto2 store the approximate number of data sets for various card capacity ratings are listed below. Sizes per one data (byte) number of data card size 128 m 256 m 1 g 2 g slm mode 301 390 k 800 k 3.2 m 6.2 m oct. Mode 879 130 k 270 k 1.1 m 2.1 m 1/3 oct. Mode 2067 58 k 110...

  • Page 126: About Memory Cards

    108 memory card about memory cards be sure to use optional memory cards from rion co., ltd. The memory cards that can be used in this unit are compactflash tm cards. * compactflash is a trademark of san disk corporation. Memory cards even from the same manufacturer and of the same type exhibit certa...

  • Page 127: About The Store Data Format

    109 memory card about the store data format data stored on the memory card are in csv format. Various fi les and subdi- rectories are created on the card, depending on the store mode. Manual store the store name specifi ed on the menu screen is created as a 4-digit number under the subdirectory name...

  • Page 128: Important

    110 memory card formatting (initializing) a cf card important formatting (initializing) a cf card will erase all data present on the card. A cf card can be formatted either in a computer or in the na-28. The procedure for formatting the card in the na-28 is described below. 1. Press the menu key to ...

  • Page 129: Input/output Connectors

    111 input/output connectors ac output 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [i/o (input/output)] and press the ent key. 3. Use the keys to select [ac out] and press the ent key. 4. Use the keys to select [main/sub] and press the ent key. The signal is avai...

  • Page 130

    112 input/output connectors the relationship between the display value shown by the na-28 and the output voltage is indicated below. When the na-28 is set to the calibration mode, the output signal (level range upper limit 120 db -6 db = 114 db, 1000 hz sinusoidal wave) is 0.5 vrms. Output v oltage ...

  • Page 131: Dc Output

    113 input/output connectors dc output 1. Press the menu key to bring up the menu list screen. 2. Use the keys to select [i/o (input/output)] and press the ent key. 3. Use the keys to select [dc out] and press the ent key. 4. Use the keys to select [main/sub] and press the ent key. The signal is avai...

  • Page 132: Trig In/comp Out Jack

    114 input/output connectors trig in/comp out jack the trig in/comp out jack is located at the bottom of the unit. A connection diagram for the trig in/comp out jack is shown below. The optional splitter adapter cc-59 is required for using the trig in/comp out jack. If the output cable cc-24 (monaura...

  • Page 133

    115 input/output connectors trig in (trigger input) 0 to 5 v logic-level signal, falling edge trigger, pulse width 1 ms or more comp out (comparator output) logic level 0 v pulse width > 1 ms comparator output approx. 480 tr time comparator le v el signal output continues for 1 second after level fa...

  • Page 134: Default Settings

    116 default settings the factory default settings of the unit are listed below. Slm/rta ........................................................ Slm mode ............................................................... L p main channel frequency weighting .................. A main channel time weight...

  • Page 135

    117 default settings l n1 (l05) ......................................... Off l n2 (l10) ......................................... Off l n3 (l50) ......................................... On l n4 (l90) ......................................... Off l n5 (l95) ............................................

  • Page 136: Setup File

    118 setup file loading settings from a setup fi le at startup has the following advantages: setup fi le stored on cf card is loaded automatically and establishes the desired settings, allowing quick measurement start. If settings were changed by mistake, simply turning the unit off and on again will...

  • Page 137

    119 setup file preparing a setup fi le for automatic loading 1. Set the na-28 to the intended condition, so that measurement pa- rameters and other settings are as desired. 2. To enable automatic loading, a simple preparatory step is required using a computer. This can be realized in two ways: (1) r...

  • Page 138

    120 setup file automatic loading of settings at startup 1. Insert a cf card prepared as described in the preceding section "preparing a setup fi le for automatic loading" into the na-28, and turn power on. 2. A dialog appears asking whether to load the settings. Select "yes" at this dialog or wait f...

  • Page 139: Saving A Setup Fi Le

    121 setup file saving a setup fi le 1. Set the na-28 to the intended condition, so that measurement pa- rameters and other settings are as desired. 2. On the menu screen, select [system], then select [read/save setting] and press the ent key. 3. Bring the cursor to any position between no. 1 and no....

  • Page 140

    122 setup file copying a setup fi le to cf card up to fi ve setup fi les can be saved in internal memory. If you want to create more setup fi les, or if you want to automatically load a setup fi le at startup, the cf card can be used. The na-28 does not allow directly saving settings in a fi le on t...

  • Page 141: Optional Accessories

    123 optional accessories microphone extension cables (ec-04 series) for enhanced measurement accuracy, the microphone can be detached from the unit and connected via an extension cable. This will reduce measurement deviations due to refraction effects of the unit or the acoustic infl uence of the op...

  • Page 142: Printer Bl-112Ui

    124 optional accessories printer bl-112ui (bl-112ui was discontinued in 2010.) data stored in the memory of the na-28 and on cf card can be printed out on a printer. You can also produce hard copy of measurement screens. (the printer, printer paper, and printer cable are options.) to print measureme...

  • Page 143: Printing Stored Data

    125 optional accessories printing stored data the steps for printing hard copy of a stored data screen are described be- low. 1. On the menu list screen, select [recall] and press the ent key. 2. Use the keys to select the stored data that you want to print. 3. When you press the ent key, the stored...

  • Page 144

    126 optional accessories 4. When you press the ent key once more, the recall menu list screen appears. Select [print] and press the ent key. 5. A display such as shown below appears. If you want to print only a range of data, select "data range print" and specify the range. Then select "execute" and...

  • Page 145: Sound Level Recording

    127 optional accessories level recorder lr-07/lr-20a by connecting a level recorder to the na-28, the sound level changes over time can be recorded. Sound level recording the procedure for recording sound level changes over time is described below. Turn power to the na-28 and the level recorder on. ...

  • Page 146

    128 optional accessories 6. Adjust the level control (level adj) of the level recorder so that the pen registers at -6 db from the top of the scale. 7. Press the cal key once more to return the na-28 to the measure- ment mode. 8. Use the freq weight key to set the frequency weighting character- isti...

  • Page 147: Program Cards

    129 optional accessories program cards the na-28 can make use of a range of optional program cards. For details on usage, refer to the documentation supplied with the respective card..

  • Page 148: Remote Control

    130 optional accessories remote control the infrared remote control (na-27rc1) can be used to control the basic functions and measurement parameters of the sound level meter. This is achieved by pressing buttons arranged on the panel of the remote control. The operation range of the remote control i...

  • Page 149: Important

    131 optional accessories insert two iec r03, size aaa batteries (lr03 or r03) into the battery compartment on the rear of the remote control. 1. Pull the cover of the battery compartment down while pushing on the section marked with the symbol. 2. Insert two iec r03, size aaa batteries, taking care ...

  • Page 150: Specifi Cations

    132 specifi cations applicable standards general measurement law of japan: precision sound level meters iec 61672-1:2013 class 1 iec 61260:1995 class 1 ansi s1.11-2004 class 1 ansi s1.4-2014 class 1 jis c 1509-1:2005 class 1 jis c 1513:2002 class 1 jis c 1514:2002 class 1 jis c 1516:2014 class 1 iec...

  • Page 151

    133 specifi cations measurement items simultaneous measurement of all items, using selected time weighting and frequency weighting sound level l p equivalent continuous sound level l eq sound exposure level l e maximum sound level l max minimum sound level l min percentile sound level l n (1 to 99, ...

  • Page 152

    134 specifi cations microphone and preamplifi er microphone uc-59 sensitivity -27 db ±2 db (re. 1 v/pa) preamplifi er nh-23 measurement level range a-weighting 25 to 140 db c-weighting 33 to 140 db z-weighting 38 to 140 db total range 25 to 140 db (a-weighting, 1 khz) upper limit for peak sound leve...

  • Page 153

    135 specifi cations linear operating range all-pass (a-weighting) 110 db (30 to 130 db range, 1 khz) spectrum 95 db level range sound level meter mode bar graph display range max. 100 db 30 to 130 db 20 to 120 db 20 to 110 db 20 to 100 db 20 to 90 db 20 to 80 db analyzer mode bar graph display range...

  • Page 154

    136 specifi cations display backlit semitransparent color tft lcd display (240 × 320 dots) update frequency: 100 ms (200 ms when performing auto store with simultaneous analysis at sampling cycles of less than 100 ms) trigger function controls measurement and memory store start level 1 trigger level...

  • Page 155

    137 specifi cations manual store data for measurement results and measurement start time are stored manually, in single address increments. Data store capacity internal memory max. 1000 data sets cf card max. 1000 data sets per store name, max. 100 store names auto store measurement results are stor...

  • Page 156

    138 specifi cations auto2 sound level meter mode continuous store of main channel and sub channel all-pass value and measurement start time, at each measurement interval analyzer mode continuous store of main channel band level and all-pass values, sub channel all-pass value, and measurement start t...

  • Page 157

    139 specifi cations dc output main channel or sub channel all-pass signal can be selected. Output voltage 3.0 v, 25 mv/db at range full- scale point output impedance 50 Ω load impedance 10 kΩ or more comparator output open-collector output band-level determination also possible connector is shared w...

  • Page 158

    140 specifi cations ambient conditions -10 to +50°c, 10 to 90% rh dimensions 331 × 89 × 51 mm weight approx. 730 g (with batteries) supplied accessories cf card 256 mb 1 storage case 1 soft case 1 ac adapter nc-94b 1 windscreen ws-10 1 output cable (bnc-mini plug cable) cc-24 1 hand strap 1 size c b...

  • Page 159

    141 specifi cations sound level meter 1/3 octave band analyzer na-28 grp num menu slm rta ent cal light power + 1 2 start/stop store mode pause/cont - level 4 3 freq weight time 51 331 89 front view side view bottom view rear view rion unit: mm dimensional drawings.

  • Page 160

    No. 50497 15-08.