5-18.
PULSE ADJUSTMENTS (Cont’dJ
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 [INSTRPRESET] [CW] and enter [4]
[.]
[9] [5] [GHz].
b.
Press [POWERLEVEL] and enter [11[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 lisec/Oiv.
15. On the
OUT, 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 834OBs 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.
our~u~
OSC I LLOSCOPE
Figure 5-67.
Pulse Modulation Rise and Fall Time Test Setup
HP 8340B/41B
Adjustments
5-125