HP 8340B Manual page 322

5-18.
PULSE ADJUSTMENTS (Cont'd)
11.
Connect the output
IF
port of the mixer to CH A of oscilloscope and set oscilloscope to
50 Ohm
input and .005 V/DIV.
12. At the Local Oscillator,
make
settings as follows:
a.
Press
[INSTR PRESET] [CW]
and enter
[4] [.] [9] [5] [GHz].
b.
Press
[POWER LEVEL]
and enter [1]
[0] [dBm].
13. Turn pulse
ON and then OFF alternately by
pressing
[PULSE] pushbutton. Adjust
A25R58 BAL
control so that the
peak-to-peak
amplitude of the envelope disiplayed on the oscilloscope
is the
same
value with pulse on and pulse off.
INTEGRATOR GATE BALANCE ADJUSTMENT
14.
Set the pulse generator
for
a
pulse width of
5
microseconds and
a
pulse period of
20
microse¬
conds. Set oscilloscope to
1
psec/Div.
15. On the DUT, press
[PULSE] [SHIFT] [AM]
and adjust
A26R7 BAL
for the flattest pulse envelope
on the
CH
A
display.
Press
[AM] OFF and the pulse envelope should be flatter. Proceed to step 23.
SLOW PULSE MODULATION,
COURSE ADJUSTMENT
NOTE
Steps
16
through 22 should only be performed for HP 83408s that are
equipped
with 006, Delete Pulse Modulation. Steps
23 through 28 should
be performed for
all
DUTs.
16.
Connect the
instruments as shown in Figure 5-67.
OSCILLOSCOPE
Figure 5-67. Pulse
Modulation Rise and Fall Time Test Setup
HP 8340B/41B
Adjustments
5-125