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10. Step Gain and 18.4 MHz Local Oscillator Adjustments
Equipment
Procedure
3-88 Adjustments
Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP436 A
Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8481A
10 dB Step Attenuator . . . . . . . . . . . . . . HP 355D, Option H89
1 dB Step Attenuator . . . . . . . . . . . . . . . HP 355C, Option H25
1. Position instrument upright as shown in Figure 3-46 and remove
top cover.
2. The validity of the results of this adjustment procedure is based
in part on the performance of the Log Amplifiers, the Video
Processor, and the Track and Hold. These adjustments must be
done before proceeding with
Step Gain and 18.4 MHz Local Oscillator.
3. Set instrument LINE switch to ON and press
Connect CAL OUTPUT to RF INPUT.
Key in
4.
[
CENTER FREQUENCY
0 dB,
[
FREQUENCY SPAN
100 Hz, and
[
SWEEP TIME
IF Gain Adjustment
5. Disconnect cable 97 (white/violet) from A4A8Jl and connect cable
to power meter/power sensor. Refer to Figure 3-47 for location of
cable 97 and A4A8Jl.
6. Adjust front-panel AMPTD CAL adjustment for a power meter
indication of -5 dBm.
7. Disconnect power meter and reconnect cable 97 to A4A8Jl.
8. Press LIN pushbutton and MARKER (-1.
9. Note MARKER amplitude in mV and adjust A45A5R33 CAL to
70.7 mV (top CRT graticule line). See Figure 3-47 for location of
adjustment.
3 MHz BANDWI D T H
F I L T E R
Figure 3-47. Location of IF Gain Adjustment
adjustment procedure of the
the
MHz,
20
]
[
R E F E R E N C E L E V E L
0 Hz, [-BW) 1 kHz, l-1
)
ms.
20
)
S T E P G A I N
C A L
).
PRESET
- 1 0 dBm,
]
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