126 Chapter2
Making Adjustments
18. Modulator Offset and Gain for Option 010 or 011
18. Modulator Offset and Gain for
Option 010 or 011
This adjustment applies to:
8590L spectrum analyzers, Option 010 or 011
8591E spectrum analyzers, Option 010 or 011
8591C cable TV analyzers, Option 011
The gain and offset of the modulator is adjusted with the internal
Automatic Level Control disabled. The modulator test point on the
A7A1 tracking generator control assembly is multiplexed onto test
point A7TP2 located on the A7 Analog Interface assembly. This is done
by executing the command MOD_TP in screen title mode.
Equipment Required
Digital multimeter (DMM)
DMM test leads
Adapter, Type N (m) to BNC (f) (two required)
Cable, BNC, 50 Ω
Additional Equipment for Option 011
Cable, BNC, 75 Ω
Procedure
1. Switch the analyzer on and let it warm up 30 minutes.
2. Connect the BNC cable to the analyzer CAL OUT to the RF INPUT
connector.
CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped
with 75 Ω inputs or damage to the input connectors will occur.
3. Press
PRESET, then perform the CAL AMPTD and CAL FREQ
adjustment routines. Refer to “CAL AMPTD Adjustment Routine”
and “CAL FREQ Adjustment Routine” procedures.
It is normal for FREQ UNCAL to appear on the display. This will
disappear after the CAL routines are finished.
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