44 Chapter2
Making Adjustments
3. 10 MHz Reference
3. 10 MHz Reference
This adjustment applies to:
All 8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers with Option 704
8594Q QAM analyzers with Option 704
The internal 10 MHz time base is adjusted for frequency accuracy. This
procedure does not adjust for long-term drift or aging rate. Only
short-term accuracy is adjusted.
A frequency counter is connected to the CAL OUT, which is locked to
the 10 MHz reference. This yields better effective resolution.
The time base is adjusted for a frequency of 300 MHz as read by the
frequency counter.
Equipment Required
Microwave frequency counter
Frequency standard
Cable, 122 cm (48 in) (two required)
Figure 2-6 10 MHz Reference Adjustment Setup
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