Adjustment Procedure; Adjustments (Continued); Procedure; Input Amplifier Adjustment Waveform - HP 5384A Operating And Service Manual

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HP 1740A TRIGGERED
SWEEP OSCILLOSCOPE
HP 5384A and HP 5385A
Adjustments
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REMOVE HP 5384A/HP 5385A TOP COVER; CONNECT
OSCILLOSCOPE PROBE AT THE JUNCTION OF R19
AND R65E.
RF OUTPUT
EXT 10 MHz
REFERENCE
HP 5384A/HP 5385A
FREQUENCY
COUNTER
BNC CABLE
INPUT A
Figure 5-2. Channel A Input Amplifier Adjustment Setup
0.05V
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J.LSec
Figure 5-3. Input Amplifier Adjustment Waveform
5-15. HP 5384A Channel 8 Input Amplifier
Adjustment Procedure
5-16. To perform the sensitivity adjustment proceed
as follows:
a. Connect the HP 8656A Signal Generator as
shown in Figure 5-4.
b. Cycle the power switch from STBY to ON and
press the FREQ B button on the HP 5384A front panel.
c. Set the HP 8656A to output a 200 MHz sinewave
at 6 mV rms. Adjust A 1 R32 for a stable display count.
Vary the frequency from 200 MHz to 50 MHz and
verify that the counter shows a stable display.
d. This completes the adjustment for Channels A
and B; switch the counter to STBY and disconnect all
test equipment.
5-17. HP 5385A Channel 8 Input Amplifier
Adjustment Procedure
5-18. To perform the sensitivity adjustments, pro-
ceed as follows:
a. Cycle the power switch from STBY to ON. Press
FREQ B button on the front panel.
b. Locate variable resistor A 1 R34 on the A 1 Mother-
board. Refer to the A 1 component locator in Section
VIII.
c. Connect instruments as shown in Figure 5-5.
5-3