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NARDA ELT-400 Operating Manual

Manual is about: Exposure Level Tester

Summary of ELT-400

  • Page 1

    Elt-400 exposure level tester operating manual bn 2 300 /9 8. 11 advanced test equipment rentals www.Atecorp.Com 800-404-atec (2832) ® established 1981.

  • Page 3: Elt-400

    Elt-400 exposure level tester bn 2304/xx, series a ... Operating manual.

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    If you have any questions about this product, please contact your local sales partner. Narda safety test solutions gmbh sandwiesenstr. 7, 72793 pfullingen © 2004 order no.: 2300/98.11 edition : 03/04.07, a ... Previous edition: 02/03.08, a ... Subject to change our normal guarantee and delivery term...

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    Contents 1 introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 about this instrument. . . . . . . . . . . . . . . . . . . . . . 1-1 1.1.1 application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1.2 about this manual . . . . . . . . . . . ...

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    5 operation and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.1 operating modes . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.1.1 exposure std (shaped time domain) . . . . . . . . 5-2 5.1.2 field strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 5...

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    7 remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.1 setting up the data link . . . . . . . . . . . . . . . . . . . . 7-1 7.1.1 data cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.1.2 interface parameters . . . . . . . . . . . . . . . . ...

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    Notes:.

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    1-1 1 introduction 1.1 about this instrument 1.1.1 application magnetic fields are present in production areas, public places and the everyday environment. Measurements are often made in these areas to ensure that people are not exposed to fields that could cause injuries. Global efforts to provide ...

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    1 introduction elt-400 1-2 emc test laboratory the elt-400 is ideal for investigating the magnetic fields produced by household equipment or other electrical devices. The reference test method described in the latest product standards such as en 50366 and pren 50392 is implemented precisely in this ...

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    Elt-400 1 introduction 1-3 1.1.2 about this manual typographic conventions some special symbols are used in certain paragraphs to make it easier to read and understand this manual. ª this symbol indicates a cross-reference to another chapter, section or document. Note: this indicates important addit...

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    1 introduction elt-400 1-4 notes:.

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    2-1 2 safety instructions 2.1 before connecting up this instrument was shipped in perfect condition. Please follow the instructions below to ensure that this condition is maintained and that operation remains safe. 2.2 correct usage the instrument must only be used under the conditions and for the p...

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    2 safety instructions elt-400 2-2 danger electric shock very high voltages can occur inside the instrument. ⇒ make sure that the instrument or the probe does not touch any part carrying a voltage. ⇒ do not open the instrument. ⇒ do not use an instrument which is opened or which is visibly damaged. ⇒...

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    Elt-400 2 safety instructions 2-3 2.3 ac adapter / charger unit 2.4 faults and excessive stresses take the unit out of service and secure it against unintentional operation if safe operation is no longer possible. This will be the case, for example, if: • the instrument shows visible signs of damage...

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    2 safety instructions elt-400 2-4 notes:.

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    3-1 3 preparation for use 3.1 unpacking 3.1.1 packaging the packaging is designed to be re-used as long as it has not been damaged during previous transport. Please therefore keep the original packaging and use it whenever you want to transport the instrument in future. 3.1.2 checking the package co...

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    3 preparation for use elt-400 3-2 3.2 power supply the elt-400 is designed to be powered from alkaline or rechargeable batteries. The ac adapter / charger unit can also be used to provide power. Note: the measurement characteristics of the elt-400 may be affected by the effect of the cable on the fi...

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    Elt-400 3 preparation for use 3-3 3.2.1 charging the rechargeable batteries complete recharging takes less than 2 hours. Starting the charging cycle ✓ the ac line voltage matches the operating voltage of the ac adapter / charger unit. ✓ the appropriate ac line adapter has been fitted. 1. Connect the...

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    3 preparation for use elt-400 3-4 3.3 preparing for field measurements 3.3.1 test setup the following are part of the complete test setup for measuring a field: • the basic instrument • the b field probe (cross sectional area 100 cm 2 ) the instrument uses an external isotropic magnetic field probe ...

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    Elt-400 3 preparation for use 3-5 disconnecting the field probe ⇒ hold the field probe by the locking sleeve and pull it off the basic instrument..

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    3 preparation for use elt-400 3-6 notes:.

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    4-1 4 control and display elements the instrument diagram in the annex shows the positions of all control and display elements. 4.1 keypad key function on/off on / off key • starts the instrument with its default settings. • switches the display backlight on or off (press briefly) • switches the ins...

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    4 control and display elements elt-400 4-2 mode operating mode selection key • switches between “exposure std” and “field strength” modes. • switches between standardized evaluation schemes and measurement ranges. • all evaluation schemes and measurement ranges implemented in the instrument are show...

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    Elt-400 4 control and display elements 4-3 4.2 lcd display 4.2.1 lcd display elements fig. 4-1 lcd elements (example) no. Function 1 measured value including units the units depend on the selected measurement mode • % • µt, mt table 4-2 lcd display elements 1 2 6 3 4 5 7.

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    4 control and display elements elt-400 4-4 2 battery symbol consisting of a frame containing four segments. Indicates the current charge status of the rechargeable batteries. In operation • outer frame displayed. • inner segments displayed to indicate the charge level. Batteries discharged • outer f...

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    Elt-400 4 control and display elements 4-5 4.2.2 display backlight switching on the display backlight ⇒ with the instrument switched on, press the on/off key briefly. The display backlight switches on. Switching off the display backlight ⇒ press the on/off key briefly. The display backlight switches...

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    4 control and display elements elt-400 4-6 4.3 external connectors there are three connector sockets for external equipment on the left side of the instrument. Socket function rs-232 serial data interface computer (pc) connection • 19200 baud • 8n1 • handshake xon/xoff • for pin connections (see fig...

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    5-1 5 operation and use 5.1 operating modes direct numerical display of: • safety margin compared with the exposure limit values specified in standards (“exposure std” mode) • field strength (“field strength” mode) • also for specialized analysis using an oscilloscope or fft analyzer (active probe)....

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    5 operation and use elt-400 5-2 5.1.1 exposure std (shaped time domain) broadband measurement with simultaneous real-time exposure assessment fig. 5-1 measurement display in “exposure std” mode measurement goal: rapid, reliable assessment of field exposure with reference limits from a selected stand...

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    Elt-400 5 operation and use 5-3 5.1.2 field strength broadband real time measurement of magnetic flux density fig. 5-2 measurement display in “field strength” mode measurement goal: measurement of overall field strength. Measured quantity: rms or peak flux density value. Display: numerical display o...

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    5 operation and use elt-400 5-4 5.2 example applications to take advantage of the full performance of the elt-400, it is important to optimize the instrument settings to match the expected characteristics of the field being investigated. The table below provides assistance for this important task. I...

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    Elt-400 5 operation and use 5-5 electronic article surveillance (electromagnetic) complex pulse shape, 20 hz to 10 khz • mode: exposure std (gen. Pub.) • range: high • low cut: 10 hz electronic article surveillance (magneto-acoustic) complex pulse shape, 58 khz • mode: exposure std (gen. Pub.) • ran...

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    5 operation and use elt-400 5-6 5.3 measuring 5.3.1 switching the elt-400 on and off switching the elt-400 on ✓ you have made sure of the power supply ⇒ press the on/off key briefly. The basic instrument switches on. The function test runs. Function test the function test checks the internal memory,...

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    Elt-400 5 operation and use 5-7 when the function test is successfully completed, – the measurement display appears. – you can now start making measurements. Fig. 5-4 measurement display switching off the elt-400 ⇒ press and hold down the on/off key for about 3 seconds. The basic instrument switches...

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    5 operation and use elt-400 5-8 the display shows the error message “nopr”. The probe is not connected or has not been detected by the instrument. ⇒ remove the probe and reconnect it. ª connecting / disconnecting the b field probe: see page 3-4 the display shows the error message “unpr”. The unknown...

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    Elt-400 5 operation and use 5-9 5.3.3 selecting the detection mode (detect) three modes of detection are available depending on the selected operating mode: ª detection mode / detector: see page c-2 ⇒ press the detect key until the required detection mode is shown in the display. Note: the selected ...

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    5 operation and use elt-400 5-10 5.3.4 selecting the lower frequency range limit (low cut) the default measurement range setting is limited to 30 hz to 400 khz. The lower frequency range limit can be extended down to 1 hz or 10 hz. ⇒ press the low cut key until the required value for the lower frequ...

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    Elt-400 5 operation and use 5-11 note: the measurement display will fluctuate whenever the setting is changed. This fluctuation depends on the selected lower frequency range limit and may continue for several seconds, particularly if 1 hz or 10 hz is selected. Wait until the display has settled befo...

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    5 operation and use elt-400 5-12 5.3.7 interpreting the measurement results fig. 5-5 measurement display showing measurement result no. Explanation 1 numerical value of measurement result the following applies to “exposure std” mode: the percentage displayed refers to the limit value specified in th...

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    Elt-400 5 operation and use 5-13 possible faults: the overload display appears fig. 5-6 overload display the selected measurement range is unsuitable for the measurement task. 1. Select high range. 2. If the overload display is still shown, increase the distance of the elt-400 from the field source....

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    5 operation and use elt-400 5-14 5.4 active probe (using the three-channel analog output) the signal detected by the field probe (measurement coils) can be displayed for scientific applications or further analysis of the signal shape and frequency. An oscilloscope or fft analyzer can be connected to...

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    Elt-400 5 operation and use 5-15 example sinusoidal signal in range 10–500 hz, measured in exposure std mode • analog output voltages on channels x, y and z are phase-shifted relative to the measured field strength by approx. 90° (due to the differentiating transfer function in exposure std mode). •...

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    5 operation and use elt-400 5-16 notes:.

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    6-1 6 maintenance and repairs 6.1 rechargeable and alkaline batteries 6.1.1 replacing the rechargeable batteries and alkaline batteries ✓ the elt-400 is switched off ✓ the elt-400 is disconnected from the ac adapter / charger unit changing the rechargeable or alkaline batteries 1. Remove the probe. ...

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    6 maintenance and repairs elt-400 6-2 6.1.2 disposal of alkaline and rechargeable batteries the instrument contains nimh batteries or alkaline batteries. Note: do not put rechargeable or alkaline batteries in household trash. Return them to the appropriate recycling center. 6.2 cleaning • do not use...

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    7-1 7 remote control 7.1 setting up the data link you will need a suitable cable for making the link between the elt-400 and the measurement computer. It is available as an accessory (bn 2260/90.51). 7.1.1 data cable db9 plug: fig. 7-1 db9 plug connections jack plug: fig. 7-2 jack plug connections d...

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    7 remote control elt-400 7-2 connecting the instrument to the measurement computer 1. Plug the jack plug into the “rs-232” socket on the elt-400. 2. Plug the db9 plug into the serial interface connector (com) of the measurement computer. 7.1.2 interface parameters ✓ the elt-400 is connected to the p...

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    Elt-400 7 remote control 7-3 7.2 fundamentals of remote control all settings can be made and results read out by remote control instead of manual operation. Note: the instrument parameters are set to defined default values if you switch the elt-400 off and then on again before using it in remote con...

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    7 remote control elt-400 7-4 the following remote control commands can additionally be used in the measurement phase: remote control command calc:bat[?]param>[cr] see page 7-17 calc:ovld[?]param>[cr] see page 7-18 get:mode_info[?]std>name>[cr] see page 7-8 meas[?][cr] see page 7-14 sen:type?[cr] see...

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    Elt-400 7 remote control 7-5 7.2.2 remote control command format the following conventions are used to describe the remote control commands: note: the remote control commands do not distinguish between upper and lower case letters. The remote control command will be ignored if the value of the trans...

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    7 remote control elt-400 7-6 7.2.3 response value formats different formats are used for the values returned as responses by the elt-400. Response strings are terminated with a “carriage return” and a “line feed”. It is a good idea to filter out and delete unnecessary characters before subjecting th...

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    Elt-400 7 remote control 7-7 7.3 remote control commands all the remote control commands used for the elt-400 are described in this section. The commands are sorted according to their meanings. Field probe sen:type?[cr] response: meaning: returns the type of field probe connected. Response values: p...

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    7 remote control elt-400 7-8 measured quantity, evaluation mode get:mode_info?[cr] response: , meaning: returns the operating mode that is selected. Note: the length of is limited to 30 characters. Param explanation 0 “field strength” mode 1 “exposure std” mode table 7-4 operating mode characterizat...

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    Elt-400 7 remote control 7-9 set:detector[cr] set:detector?[cr] response: meaning: selects the detection mode. Param explanation rms the rms value measured using the selected operating mode will be output. Peak the peak value measured using the selected operating mode will be output. Stnd in “exposu...

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    7 remote control elt-400 7-10 set:low_cut[cr] set:low_cut?[cr] response: meaning: sets the lower frequency range limit. Param explanation 1 defines 1 hz as the lower frequency range limit. 10 defines 10 hz as the lower frequency range limit. 30 defines 30 hz as the lower frequency range limit. Table...

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    Elt-400 7 remote control 7-11 set:max_hold[cr] set:max_hold?[cr] response: meaning: activates / deactivates the max hold display function. Param explanation on activate max hold display function • the highest value measured since the function was activated is output instead of the current measuremen...

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    7 remote control elt-400 7-12 set:mode[cr] set:mode?[cr] response: meaning: selects the operating mode. The operating modes are numbered consecutively (1 to 4). The mode assigned to each number depends on the instrument version. Note: the operating mode selected can also be queried as text informati...

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    Elt-400 7 remote control 7-13 set:range[cr] set:range?[cr] response: meaning: sets the measurement range for the selected operating mode. Param explanation low measurement range particularly suitable for low field strengths • high measurement sensitivity. • reduced overload capacity. High measuremen...

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    7 remote control elt-400 7-14 meas meaning: transfers the measured values and, where appropriate, the status information. Different modes for transferring individual values and for transferring values continuously are provided. Remote control command explanation meas?[cr] transfers the latest measur...

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    Elt-400 7 remote control 7-15 response values: [, ovld] [, bat] example: 1.234e-07, t, n, o ª remote control command set:low_cut, see page 7-10 ª remote control command calc:bat, see page 7-17 ª remote control command calc:ovld, see page 7-18 response explanation unit units of measured value; depend...

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    7 remote control elt-400 7-16 syst:kloc[cr] syst:kloc?[cr] response: meaning: locks / unlocks the keypad of the basic instrument. Note: the basic instrument can still be switched off using the on/off key when the keypad is locked. The keypad is unlocked when you switch the basic instrument on again....

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    Elt-400 7 remote control 7-17 instrument status query calc:bat[cr] calc:bat?[cr] response: meaning: activates / deactivates battery status information. The battery status is appended to the response values for a field measurement. ª remote control command meas, see page 7-14 param explanation on bat...

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    7 remote control elt-400 7-18 calc:ovld[cr] calc:ovld?[cr] response: meaning: sets whether or not overload status information is returned at the end of a result: the overload status indication is appended to the response values for a field measurement. ª remote control command meas, see page 7-14 me...

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    Elt-400 7 remote control 7-19 syst:bat?[cr] response: meaning: queries the battery charge status. Note: if you regularly query the charge status, the instrument will continue to operate for about 15 minutes after the first appearance of the “bat_low” message. The instrument will then switch off auto...

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    7 remote control elt-400 7-20 syst:err?[cr] response: meaning: queries the error status resulting from the last command used. The response value indicates the correct interpretation of the previously sent command or the instrument status. Param explanation 0 no error -109 incomplete parameter -110 u...

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    Elt-400 7 remote control 7-21 data transfer protocol syst:xonxoff[cr] syst:xonxoff?[cr] response: meaning: selects the software handshake setting the default values syst:defaults[cr] meaning: sets the instrument settings to their default (factory) values. ª annex a: default values the instrument inf...

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    7 remote control elt-400 7-22 notes:.

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    8-1 8 specifications the specifications are valid for the following conditions and settings unless otherwise stated: • ambient temperature: 23 °c (±3 °c) • relative humidity: 40 % ... 60 % • sine wave signal (cw) • root mean square value (rms) • lower frequency range limit: 30 hz • operation from re...

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    8 specifications elt-400 8-2 8.2 field strength mode brief description • measurement of magnetic flux density based on a broadband evaluation of the measurement signal. • display of measurement result in units of mt or µt. Frequency range measurement range, dynamic range all measurement range inform...

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    Elt-400 8 specifications 8-3 damage level the frequency-dependent overload limit shown in figure 8-1 must be taken into account in all measurements. Fig. 8-1 damage level note: the damage level (peak) applies to a pulse duration of ≤15.6 ms and a duty cycle of ≤1/64. Measurement value collection sam...

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    8 specifications elt-400 8-4 measurement uncertainty note: the following influence quantities must also be taken into account: • frequency response at the selected band limits: 10 hz, 30 hz, 400 khz: -3 db ±1 db 1 hz: -3 db ±2 db • sufficient signal to noise ratio result display measurement uncertai...

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    Elt-400 8 specifications 8-5 8.3 exposure std (shaped time domain) mode brief description • measurement of magnetic flux density taking the limit value characteristic of the selected standard into account. • rms and peak values are measured and calculated simultaneously. • display of magnetic flux d...

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    8 specifications elt-400 8-6 measurement range, dynamic range nominal measurement range the fixed measurement range is nominally 100 % of the selected limit value curve. 1 the frequency-dependent damage level should also be taken into account. ª (see fig. 8-1) measurement value collection operating ...

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    Elt-400 8 specifications 8-7 result display 8.4 general specifications display type and warning features remote control interface (serial) result display, selectable instantaneous value or maximum value (max hold) display type digital digital display resolution 4 digits refresh rate 4 times per seco...

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    8 specifications elt-400 8-8 analog signal output “scope” 1 see under “measurement range” for the selected operating mode measurement probe power supply battery operation – or – output signal x, y, z (isotropic). Three separate channels output voltage for nominal measurement range (1) 50 mv (rms) ou...

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    Elt-400 8 specifications 8-9 ac adapter / charger unit calibration interval the recommended calibration interval is 24 months. 8.5 conformance labeling this fulfils the conditions required for affixing the ce conformance label. Primary batteries (alkaline) 4 x size aa, iec lr6 operating time from pr...

  • Page 78

    8 specifications elt-400 8-10 8.6 climatic environmental conditions environment classes selected climatic parameters 8.7 dimensions and weight environment class as per … storage transport operation iec 60721-3 class 1k3, 1m2 class 2k4, 2m3 class 7k2, 7m3 low air temperature restricted air temperatur...

  • Page 79

    Elt-400 8 specifications 8-11 8.8 ordering information 8.9 package contents built-in operating modes (mode) order number • exposure std: icnirp gen. Pub. • exposure std: icnirp occ. • fieldstrength: 320 µt • fieldstrength: 80 mt bn 2304/101 • exposure std: bgv b11 exp2 • exposure std: bgv b11 exp1 •...

  • Page 80

    8 specifications elt-400 8-12 8.10 accessories (optional) extension cable probe / instrument (length 1 m) 2300/90.30 rs 232 interface cable (length 2 m) with jack plug / db9 plug 2260/90.51 analog interface cable (d sub 15 / 3 x bnc, length 3 m) 2260/90.80 tripod, non conductive (height 1.65 m) 2244...

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    A-1 annex a: default values the table below lists the default values (ex-works settings) of the elt-400: • when the instrument is switched on, • after the remote control command syst:defaults has been executed. The following table shows the status of the major parameters after various actions. Param...

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    Annex a: default values elt-400 a-2 parameter status of parameter after action change of measuring range [range] change of operating mode [mode] change of lower frequency range limit [low cut] change of probe status of parameter after remote control command set: range set: mode set: low_cut range as...

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    B-1 annex b: exposure std mode technical background health and safety standards prescribe various methods for determining field exposure, where the reference values stated in the standard are compared with the measured values: in calculating the exposure, this means: the result of the exposure calcu...

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    Annex b: exposure std mode elt-400 b-2 limit value curve frequency dependency the frequency response describes the degree to which the field strength at a given frequency f1 may differ from that at another given frequency f2 for the limit value to be achieved in both cases. The limit value curve can...

  • Page 85

    Elt-400 annex b: exposure std mode b-3 advantages of this method this method is particularly useful when the signal shape is unknown, e.G. Multiple-frequency fields or pulsed fields. The rms and peak detectors ensure that such fields are evaluated properly. The elt-400 continuously and automatically...

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    Annex b: exposure std mode elt-400 b-4 please note when you compare the results from the elt-400 in “exposure std” mode with those from other field measuring instruments, some possible factors that need to be taken into account are: • the comparison system must also measure isotropically and combine...

  • Page 87

    C-1 annex c: instrument function functional principle the voltage induced in the measurement coils (field probe) is evaluated in order to measure the magnetic flux density. The signal voltages are digitized and evaluated by a digital signal processor (dsp). The dsp calculates the measurement result ...

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    Annex c: instrument function elt-400 c-2 transfer function the transfer function defines the intended frequency response of the measuring instrument and includes the field probe measuring coils. The transfer functions for the various operating modes differ significantly from each other. Detection mo...

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    Elt-400 annex c: instrument function c-3 peak value the peak value of the magnetic flux density is calculated from the variation with time b x (t) through b z (t) of the magnetic flux density in each of the three measurement axes. The peak value always depends on the phases of the measured field com...

  • Page 90

    Annex c: instrument function elt-400 c-4 band limits the signal is attenuated according to the following function at the upper and lower limits of the frequency range. Fig. C-2 lower band limits (low cut = 1 hz, 10 hz and 30 hz) fig. C-3 upper band limit.

  • Page 91

    Elt-400 annex c: instrument function c-5 settling time the variation with time of the field under investigation is sampled at intervals of about 1 µs. This means that the internal signal voltages reflect any changes in the field immediately. The peak value is measured at the same, high sampling rate...

  • Page 92

    Annex c: instrument function elt-400 c-6 overload monitoring the measurement signals of all three measurement channels (x, y, z) are monitored separately. The overload indicator is displayed if an overload occurs in at least one of the channels. Fig. C-4 overload indicator the overload indicator is ...

  • Page 93

    D-1 annex d: probe configuration / signal output the internal sensor coils are arranged orthogonally. The configuration of the coils is not immediately visible externally. If you require the result display to be referred to the spatial axes of the room in which the measurement is made, the probe coi...

  • Page 94

    Annex d: probe configuration / signal output elt-400 d-2 connecting cable the following connections are provided if the analog interface cable (bn 2260/90.80) is used: koax plug: • red: x axis • green: y axis • blue: z axis db9 plug: fig. D-2 db9 plug connections 1 = x-axis 2 = y-axis 3 = z-axis 6 =...

  • Page 95

    Elt-400 b field probe connector rs-232 scope charge.

  • Page 96

    Notes:.

  • Page 97

    Index of key words a ac adapter / charger unit 2-3 , 6-2 , 8-9 accessories 8-12 active probe 1-2 , 5-14 alkaline batteries 6-1 application 1-1 emc test laboratory 1-2 everyday environment 1-1 production areas 1-1 b b field probe 3-4 connecting 3-4 disconnecting 3-4 basic instrument keypad 4-1 batter...

  • Page 98

    F fft analyzer 1-2 , 5-14 fiber optic cable 7-1 field strength 1-2 , 5-1 , 5-3 , c-2 dynamic range 8-2 measurement range 8-2 measurement uncertainty 8-4 measurement value collection 8-3 frequency response c-2 function test 5-6 functional principle 8-1 , c-1 i instrument connecting to the measurement...

  • Page 99

    S safety instructions 2-1 scope 4-6 settling time c-5 specifications 8-1 stnd (standard) 5-9 , c-3 switching on 5-6 t test setup 3-4 transfer function c-2 transport damage 3-1 u unpacking 3-1 w weight 8-10

  • Page 100

    Notes:.