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  5. Getting Started

NARDA 8718 Getting Started

Summary of 8718

  • Page 1

    Getting started with your 8718 an communications company narda safety test solutions l 3 this getting started guide is a duplication made as a reference and convenience to our customers who have misplaced the original (printed in 1996) that came with their 8718 rf radiation survey meter. Narda’s log...

  • Page 2: Table Of Contents

    2 table of contents section name. . . . . . . . . . . . . . . . Pg 1 introduction . . . . . . . . . . . . 3 2 description . . . . . . . . . . . . . 5 3 getting ready . . . . . . . . . . . 11 4 making a measurement . . . . . . 13 5 menu system . . . . . . . . . . . 29 index . . . . . . . . . . . . . ...

  • Page 3: Introduction

    3 1 introduction about the model 8718 your model 8718 is a hand-held, battery-powered meter designed to simplify the measurement of electromagnetic fields. It can be used with any narda 8700 series probe. The meter enables you to perform both simple measurements and more demanding ones that require ...

  • Page 4

    4.

  • Page 5: General Description

    5 2 understanding your model 8718 general description it is important to be familiar with the model 8718 before you use it. This section includes descriptive data keyed to highlighted illustrations to help you locate the various features of the meter. The descriptions not only identify the features ...

  • Page 6: Probe Connection

    6 probe connection to make measurements, use your model 8718 with a probe. Connect the cable of the probe to the probe connector located at the top of the unit. If you use a fiber optic link, the probe connects to a fiber optic transmitter. A fiber optic cable connects the transmitter to the rectang...

  • Page 7: Strap And Tripod Mount

    7 strap and tripod mount a strap is provided on the underside of the model 8718. It has a hook and loop closure to permit easy adjustment, around your hand. Behind the strap is a threaded connector used to secure the meter to a tripod. Loosen the strap to access this connector. Operation with a comp...

  • Page 8: Keyboard

    8 keyboard the model 8718 has four groups of keys distinguished by their color. Function keys (green) numeric keys (yellow) special function keys (white) power keys (blue, green) power keys two power keys are used to turn the model 8718 on and off. Function keys use the four function keys (f1-f4) to...

  • Page 9: Numeric Keypad

    9 numeric keypad use the numeric keypad to enter number data into the model 8718. You also use the numeric keypad to select an option listed on the display screen. Special function keys six special function keys enable you to perform specific functions. Esc returns you to the previous menu. In a few...

  • Page 10

    10

  • Page 11: Introduction

    11 introduction this section will help you get ready to take measurements with your model 8718. Information is included for selecting a probe, connecting the probe to your model 8718, and connecting the optional fiber optic link. 3 getting ready frequency range power density or field strength electr...

  • Page 12: Connecting A Probe

    12 connecting a probe connect the cable of your probe to the probe connector at the top of your model 8718. Make certain that the retaining ring of the connector is securely fastened. Using a fiber optic link (optional) a fiber optic link is useful when remote or low frequency ( to use the fiber opt...

  • Page 13: Making A Measurement

    13 4 making a measurement introduction this section will help you take measurements with your model 8718. Information is included for turning the meter on, selecting, zeroing, and testing a probe, plus an explanation of the main measurement screen of the meter. Some general information is also inclu...

  • Page 14: Entering The Probe Model

    14 entering the probe model narda's 8700 series system is completely modular — all 8700 meters work with all 8700 probes. The single most important thing you must do is "tell" the 8718 meter which probe you are using. The model 8718 has the basic characteristics of every 8700 series probe stored in ...

  • Page 15

    15 to select from the probes in memory... 1. If you haven’t already, press f1 (measure). 2. The model number and the serial number of the last probe used will be displayed on the second line of the display. If you want to use the same probe, press enter. 3. If you want to use a different probe, look...

  • Page 16: Ote

    16 to use a probe that is not in memory... 1. If you haven't already, press f1 (measure). 2. The model number of the last probe used will be displayed on the second line of the display. If you want to use the same model probe, press enter. 3. If you want to use a different model probe, select probe ...

  • Page 17: Zeroing The Probe

    17 zeroing the probe the probe and meter must be “zeroed” together. It is important that the probe is not exposed to radiated fields during the zeroing process. The storage case is shielded and provides a convenient “zero density” environment. To zero the probe... 1. Place the probe in the storage c...

  • Page 18

    18 • the field strength is not low enough. Move away from the antenna and use the storage case to zero the probe. • the probe is damaged. Try another probe. To reconfirm the zero while the instrument is in use... 1. Establish a zero density environment for the probe as before. 2. Press the auto zero...

  • Page 19: (Shaped Probes)

    19 main measurement display screen (shaped probes) 1 2 . 1 % s t d 2 7 . 5 m a x c f 1 . 0 0 l o g m e n u % s t d f r e q f1 f2 f3 f4 field strength • indicates actual measured value • unit of measure is always % std for shaped frequency response probes bar graph • indicates approximate field stren...

  • Page 20: Alternate Display Screen

    20 alternate display screen the alternate display screen is very similar to the main measurement display screen with one difference. On the third line an instantaneous indication of the percent of standard is shown instead of displaying a maximum value. This screen should only be used with flat resp...

  • Page 21: Bar Graph Ranges

    21 value to the standard at the frequency shown on line 3. This instantaneous readout of percent of standard is particularly useful where the allowable level must normally be calculated. If you are using a probe in memory or have entered a numeric correction factor, the meter will also be correcting...

  • Page 22: Using Audio Alarms

    22 using audio alarms you can set an audio alarm to sound at a specific value. You can also activate a variable tone alarm. Both alarms can help you conduct surveys and can provide a warning of high electromagnetic fields. You can even use both at the same time. Under these conditions, the variable ...

  • Page 23: Testing The Probe

    23 testing the probe your model 8718 is equipped with two rf sources for testing probes. Press test source and both sources will stay on for approximately 20 seconds. A contact on the right side of the unit is used for testing low frequency probes. These probes have three test points around the head...

  • Page 24

    24 correction factors can be used: • when there is only a single emitter being surveyed. • when there are multiple emitters all operating at the same frequency (this is often the case with industrial equipment). • when there are multiple emitters with frequencies that are close to each other and the...

  • Page 25

    25 to use a correction factor for a probe not in memory... 1. Press f2 (menu). The first menu screen will appear. 2. Press 3 (cor fact). A screen will appear that shows the correction factor. 3. Use the correction factors on the handle of the probe to determine the appropriate correction factor and ...

  • Page 26: Measurement Uncertainty

    26 measurement uncertainty the uncertainty of any measurement includes several factors: • frequency response or frequency sensitivity is typically ±1 db to ±2 db (from about ±25% to about ±55%). The correct use of correction factors can greatly reduce the amount of uncertainty associated with freque...

  • Page 27: About Measurement Surveys

    27 about measurement surveys when you perform surveys, it is important that you observe a few guidelines to insure accurate readings: • make sure you move the probe to obtain a maximum reading. • keep the arm holding the probe extended out from your body as far as possible with the probe pointed tow...

  • Page 28: Precautions

    28 precautions when making measurements of electromagnetic fields, a potential exists to expose yourself to excessive levels. Approach the source of energy slowly and begin making measurements from a distance at which low field levels exist. Be prepared to evacuate the area immediately if rf field l...

  • Page 29: Introduction

    29 introduction this section will help you use the model 8718's menu system. The menu system allows you to enter and store data and to select various options during operation. The menu system is always available from any measurement mode. It is accessed by pressing the appropriate function key that ...

  • Page 30: First Menu Screen

    30 key menu options 1 setups up to four sets of measurement situations can be stored and recalled. Setups are similar to macros in other computer programs and can save keystrokes when repeating measurements with the same meter settings. 2 display avg select from four options to determine how fast th...

  • Page 31: Second Menu Screen

    31 second menu screen key menu options 1 cable/fo select between the standard probe cable input and the fiber optic receiver. 2 time avg turn fixed time averaging (various duration) on or off. Turn the spatial averaging mode (used for whole body averaging measurements) on or off. 3 data log log with...

  • Page 32: Third Menu Screen

    32 third menu screen key menu options 1 lockout lock the keypad so that settings will not accidentally change. To release, press enter and esc together. 2 blankout blank the display and lock the keypad. To release, press enter and esc together and then select another menu item. 3 back return to the ...

  • Page 33: Index

    33 alarm, audio description .................................................6 using ........................................................22 audio, menu .............................................30 auto zero, key..............................................9 back, menu ..........................

  • Page 34: Narda

    An communications company narda safety test solutions l 3 usa: 435 moreland road hauppauge, ny 11788 tel 1-631 231-1700 fax 1-631 231-1711 e-mail nardasts@l-3com.Com www.Narda-sts.Com germany: sandwiesenstrasse 7 d-72793 pfullingen tel +49-7121-9732-777 fax +49-7121-9732-790 e-mail support@narda-sts...