NARDA 8718B Manuel utilisateur

USER'S GUIDE

Model 8718B

Electromagnetic

Radiation

Survey Meter

P/N 42983600 RevB

narda

SafetyTest Solutions

an communications company

1Chapter 1 Introduction

1Introduction

About the Model 8718B

Your Model 8718B 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 8718B is an

upgraded version of the original Model 8718.

Although there are many enhancements, the

8718B is most easily distinguished from its

predecessor by the quick-release style probe

connector.

The meter enables you to perform both simple

measurements and more demanding ones that

require averaging and/or data logging. It can be

mounted on a tripod and used with an optional

fiber optic link for enhanced accuracy in certain

applications.

Getting Started with the Model 8718B

It is important to become familiar with the Model 8718B before

you use it. Chapter 2 explains the basic meter hardware.

Chapters 3 and 4 cover probe selection and basic operation.

The menu system, which is the gateway to all the meter’s

advanced features, is the subject of Chapter 5.

It is strongly recommended that, as a minimum, you read

Chapters 2-4, and preferably Chapter 5, thoroughly before you

attempt to use the Model 8718B. The advanced features in

Chapters 6 though 17 can then be referred to as required.

Chapter 18 covers the use of the User's Software.

Return the Owner

Registration Card for

updates and your

copy of the

Applications Booklet.

Note

2Operating the Meter

User’s Guide Updates

This User’s Guide was thoroughly reviewed for accuracy prior to

publication. Corrections to this guide necessitated by errors or

omissions or by minor revisions to the meter firmware will be

covered in the README file enclosed with the User's Software.

The README file is available at any time from the HELP menu

within the User's Software.

Equipment Supplied

Your Model 8718B is supplied with:

•Meter

•Battery Charger/Power Supply

•Power Cord (230 volt chargers only)

•Storage Case

•Probe Extension Cable Model 8744-04

•Electric Field Attenuator Model 8713B

•User's Software (CD-ROM)

•Computer Cable

•User’s Guide

Using this Guide with a Model 8718

The Model 8718 can be upgraded to take advantage of most, but

not all, of the improvements incorporated into the Model 8718B.

The upgrade includes some minor hardware changes and the

installation of the Version 3.0 firmware that is described in this

guide. There are only a few differences in the operation of a

Model 8718 upgraded with Version 3.0 firmware versus the new

8718B. Those differences are noted in this guide.

3Chapter 2 Understanding Your Model 8718B

2Understanding Your Model 8718B

General Description

It is important to be familiar with the Model 8718B 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 but

tell you how they are used.

Battery Charger and Power Cord

The battery charger and power cord are used to recharge the

battery within the Model 8718B.

To recharge the meter, first connect the cable of

the battery charger to the larger jack on the left

side of the meter. Make sure the plug is fully

inserted into the jack. Connect the power cord to

the wall outlet.

The battery will be fully charged in about 8 hours.

The indicator light on the charger illuminates

during charging. A full charge will give you about

20 hours of operation (approximately 6.5 hours if

back lighting is used).

The charger can also be used to power the

Model 8718B when it is to be operated for periods

beyond the capacity of the battery.

NiCad batteries

should be fully dis-

charged (<20% indi-

cation) before

recharging. Charge

for a minimum of 8

hours. See Checking

Battery Status in

Chapter 12.

Note

4Operating the Meter

Probe Connection

To make measurements, you must use your

Model 8718B with a compatible 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 rectangular fiber optic jack on

the left side of the meter.

Audio Alarm

Your Model 8718B is equipped with an audible

alarm that emits sound through a tiny hole on the

bottom of the meter. The alarm sounds whenever

the field strength exceeds the measurement range

of the probe (over ranges).

You can also set the meter to sound its alarm at a

specific level and/or turn on a variable-tone mode.

Probe Test Sources

Your Model 8718B is equipped with two RF

sources for testing your probes. The Test Source

key will turn these sources on. They will stay on for

approximately 20 seconds.

A microwave (waveguide) window on the right side

of the probe is used for testing high frequency

probes.

A contact on the right side of the meter is used for

testing low frequency probes. Most probes have

three test points on the head of the probe.

5Chapter 2 Understanding Your Model 8718B

Strap and Tripod Mount

A strap is provided on the underside of the Model

8718B. 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 Computer

To update probe calibration information or retrieve

stored measurements, you must connect your

Model 8718B to a personal computer and use the

User's Software provided by Narda.

See Chapter 18, User's Software.

Operation With a Recorder

To obtain a continuous record of measurement

over an extended period of time, you can connect a

data recorder to the smaller jack located on the left

side of the meter.

See Chapter 17, Operation with a Data Recorder.

6Operating the Meter

Keypad

The Model 8718B 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

8718B On and Off.

Function Keys

Use the four function keys

(F1-F4) to select the options displayed on

the bottom line of the display screen

directly above the F1, F2, F3, and F4

markings. In a few cases the options will be

spelled out on the display.

The keys on the

8718B must be firmly

depressed to per-

form their function

and give a tactile

feedback when prop-

erly depressed.

Note

7Chapter 2 Understanding Your Model 8718B

Numeric Keypad

Use the numeric keypad to enter number data into the Model

8718B. You also use the numeric keypad to select a numbered

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

cases you must enter a selection rather than

use the Esc key.

Auto Enables you to automatically zero the meter

Zero and probe.

Help Displays a help screen that explains your options.

Test Turns on the built-in low frequency and high

Source frequency probe test sources for approximately

20 seconds.

Range Locks in a specific measurement range for the

bar graph. The digital display is not affected. The

meter automatically displays a digital value over

the probe’s entire measurement range. See Bar

Graph Ranges on page 23.

Enter Stores data you entered with the numeric

keypad. Confirms an option you selected from

a menu screen.

8Operating the Meter

9Chapter 3 Probe Selection

Introduction

The 8700 series RF measurement system offers a very broad

selection of probes. The factors that you should consider in

selecting the probe, or probes, best suited for your task are

described in this section.

3Probe Selection

The probe frequency range should include the frequencies of all

the emitters to be surveyed at one time.

The measurement range of the probe should be adequate for

the field levels that you anticipate, i.e., do you expect strong

fields or weak fields? Probes give more accurate and more

stable readings when they are not used at the extreme low end

of their sensitivity range. Therefore, if you anticipate measuring

very weak fields, select a probe with a lower power full-scale

measurement range to get greater sensitivity. In contrast, higher

power probes give additional safety margins, especially at

microwave frequencies where field strength can change rapidly

with a small change in distance to the source. Select a probe

with a higher power full-scale measurement range if you

anticipate measuring high level fields.

Most standards recommend that you measure both electric (E)

and magnetic (H) fields below 300 MHz (due to the possibility

that measurements may be made in the near field). Since most

experts agree that the electric field poses a greater danger at

lower frequencies due to induced and contact currents that can

occur, the electric field is normally measured first. Higher

frequency measurements are normally made of only the electric

field since measurements will generally be made in the far field.

FREQUENCY

RANGE

POWER

DENSITY

OR FIELD

STRENGTH

ELECTRIC FIELD

VERSUS

MAGNETIC

FIELD

Key Factors in Selecting a Probe

Table des matières

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