NARDA 8718B, User Manual

Page: 42 / 137

41 Chapter 7 Spatially-Averaged Measurements
6. Press F1 (START) while slowly moving the probe
vertically at a constant rate of movement.
7. Strive for an interval of about ten seconds between
starting and stopping the timer. The meter will beep
every second as a timing aid.
8. When the probe reaches the height equal to the top of
an adult’s head ( about 6 ft./1.9 m), press F1 again
( STOP ).
9. The meter will show the average value on the second
line of the display and the maximum value on the left
side of the third line of the display. The bar graph will
be indicating the instantaneous field magnitude in real
time. The averaging interval will be shown on the right
side of the third line, which can be useful in perfecting
your spacial averaging technique.
2 4 . % S D T
3 9 . 5 M A X C F 1 . 0
T S A R T M A X M E N Q U I T
2
F1 F2 F3 F4
0
R
U
1 7 . % S D T
E R A G E
3 9 . 5 M A X 1 0 . 4 S E C
T S A R T C L R M E N U Q U I T
8
F1 F2 F3 F4
A V
1 2 . % S D T
3 9 . 5 M A X C F 1 . 0
S T O P
1
Fl F2 F3 F4
0
It is important to
move the probe
vertically at a con-
stant rate to obtain
an accurate spa-
tially averaged
measurement.
N
ote
The averaging time
resolution is approxi-
mately 1/4 second.
N
ote