Chapter 2 49
Making Adjustments
5. Crystal and LC Bandwidth Filter
5. Crystal and LC Bandwidth Filter
This adjustment applies to:
All 8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers
8594Q QAM analyzers
The crystal and LC bandwidth filter circuits are adjusted for symmetry,
center frequency, and peak amplitude.
First, correction constants are turned off. This allows for uncorrected 3
dB resolution bandwidth centering and amplitude adjustments.
New corrections are then generated by performing the CAL FREQ and
CAL AMPTD adjustment routines.
Equipment Required
Crystal shorts (set of three)
Cable, BNC, 23 cm (9 in)
Additional Equipment for 75 Ω Input
Cable, BNC, 75 Ω, 30 cm (12 in)
Procedure
1. Turn the analyzer LINE switch to OFF. Remove the instrument cover
assembly.
2. Turn the analyzer LINE switch to ON, then press the following
analyzer keys.
PRESET
CAL, More 1 of 4
CORRECT ON OFF (OFF)
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