Model
8904A
Performance Tests
4. On the Multifunction Synthesizer, press the
0
or
U
keys until the negative-going zero crossing
of
the
last
cycle
of
the tone burst touches
OV
with no positive
or
negative slewing. (Slewing refers
to the rapid change in voltage which appears
as
a vertical line on the oscilloscope.) The
“On
Time”
setting which appears on the Multifunction Synthesizer’s display should be between 4.98
and
5.02
ms.
On-Time Timing:
4.98 5.02
ms
Off
-Time
Accuracy
5.
On the Multifunction Synthesizer, press
f4
(Off
Time),
key in the number recorded in step
4, then press
ms.
(The off-time should equal the on-time as shown on the Multifunction
Synthesizer’s display and should be approximately
5
ms.)
6.
Adjust the spectrum analyzer to observe the
1
kHz tone burst and its
100
Hz
sidebands. Refer
to Figure 4-9.
7.
On the Multifunction Synthesizer, press the
0
or
U
keys until the second upper sideband
of the
1
kHz carrier is nulled. The
“Off
Time”
setting which appears on the Multifunction
Synthesizer’s display should be within
0.01
ms of the
“On
Time”
setting.
Off-Time Timing Difference:
-0.01
0.01
ms
Performance Test
12
4-39
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