HP 8340B Manual page 70

4-14.
PULSE MODULATION VIDEO FEEDTHROUGH TEST (Cont'd)
3.
Set both oscilloscope
channels (A and B)
to
50 Ohm
input.
Set the oscilloscope to view the pulse
generator output waveform.
Adjust the
HP 8012B
pulse width
VERNIER
for
a
100 nanosecond
pulse. Adjust the pulse period
VERNIER
for
a
100 microsecond period. Adjust the amplitude
VERNIER
for about
a
3V
pulse amplitude (TTL
level).
Set
the oscilloscope horizontal
sweep
to
50
nanoseconds/division and select channel
A
input
only.
4.
On the
OUT, press [INSTR PRESET] followed by
[CW] [.] [4]
[GHz].
Press the [PULSE] key (pulse
ON).
5.
Press the
[POWER LEVEL]
key and
enter
the first
power
level,
[8] [dBm].
6. Adjust the
oscilloscope channel
A
vertical sensitivity and vertical position to
view
the video
feedthrough
signal similar to
Figure 4-18.
Figure 4-18.
Pulse Modulation Video Feedthrough
Waveform
7.
The
test limits
for the three power levels are shown
in
Table 4-28. (Note that the test
limit is
5%
of
Vpk.)
Table
4-28. Pulse Modulation Video Feedthrough Test Limits
HP8340B/41B
RF
Output
Level
(dBm)
+8
0
-10
P=
(dBm)
-2
-10
-20
Vpk
0.2511
0.0999
003162
TEST
LIMIT
(pk voltage)
12
mV
5mV
1.6mV
HP 8340B/41B
Performance Tests