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6. Place cursor in the "Display:" field and
press
CLEAR
CLEAR SCOPE screen should appear
similar to figure 18-5.
No waveform is present until the
transmitter is turned on.
7. Turn on the ASTRO radio and press PTT.
CAUTION
The analyzer's built-in RF load dissipates
up to 50 W for three minutes and up to
125 W for one minute. If a high-power
transmitter is keyed into the analyzer for a
time long enough to threaten overheating
the
power
measuring
analyzer's audible alarm sounds and the
display
changes
to
OVERTEMPERATURE warning, signaling
t
he operator to unkey.
8.
Move the cursor to "H
select the desired scale.
9.
Move the cursor to
the desired scale.
10.
Move the cursor to "Vert Position:" field.
Use
move up/move down
rotary control to position the recovered
audio
w
aveform
graticule.
softkey.
The
SCOPE
circuitry,
the
the
RF
LOAD
oriz:" field and
"Vert:" field and select
softkeys or
on
a
convenient
11. Move the cursor to "Horiz Position:" field.
Use
move left/move right
rotary control to position the recovered
audio
graticule.
12. Move the cursor to "Mrk:" field.
V
13. Press
markers that measure voltage differential
(Vp-p).
14. Press T softkey to display movable
markers that measure time differential
(sec).
15. Press 1/T softkey to display movable
markers that measure reciprocal time
differential (in Hz).
16. Position the markers as desired using
TUNING knob (press toggle marker
softkey to select marker). The movable
marker is indicated by a dashed line.
Observe digital readout of marked values
below "Mrk:" field.
249
waveform
on
a
softkey to display movable
softkeys or
convenient
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