NARDA 8718B, User Manual

Page: 21 / 137

20 Operating the Meter
Alternate Measurement Display Screen
The Alternate Measurement Display Screen is very similar to the
Main Measurement Display Screen with one difference. This
display mode is used to show frequency-specific, real time
information on the third line of the display instead of a maximum
value. It should be used only for single frequency or narrow
band measurement applications. The information that is shown
depends on whether a flat frequency response probe or a
shaped frequency response probe has been selected.
•
Flat Frequency Response Probes. This display mode
instantly converts the measured value to a percent of
the referenced exposure standard at a particular
frequency.
•
Shaped Frequency Response Probes . This display
mode instantly converts the measured value, shown in
Percent of Standard, to an equivalent power density
value at a particular frequency.
The use of the Alternate Measurement Display Screen also
introduces an automatic correction for probe frequency
deviation for probes in memory.
The option to change display screens is only available when
other options such as spatial averaging, data logging or time
averaging have not been turned on.
To use the Alternate Measurement Display Screen...
1. Make sure that the 8718B is set to the correct exposure
standard. See Chapter 11 Using the Standards
Feature .
2. Press F4 ( FREQ ) from the Main Measurements Display
Screen . A new screen will appear to allow you to enter
a frequency.
3. Enter the frequency that you are measuring. You must
fill all four positions. If you make a mistake just enter
more digits until correct. For greater accuracy, use the
units that allow the larger number. For example, enter
10.00 kHz, not 00.01 MHz.
The Alternate Mea-
surement Display
Screen should only
be used for single
frequency measure-
ments or where all
emitter frequencies
are close and the ex-
posure standard has
the same limits. Re-
fer to Using Probe
Correction Factors
on page 24.
N
ote