NARDA 8718B Bedienungsanleitung
USER'S GUIDE
Model 8718B
Electromagnetic
Radiation
Survey Meter
P/N 42983600 RevB
narda
SafetyTest Solutions
an communications company
L
3
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
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