10 MHz Internal Frequency Reference Adjustment

This adjustment applies to the following models:

All X-Series models

This procedure adjusts the internal 10 MHz Frequency Reference to within ± 0.5 Hz of 10 MHz. This adjustment is necessary when the 10 MHz Accuracy Performance Test fails.

For this test, the output of a 10 MHz frequency standard is connected to the analyzer RF input. The analyzer measures the signal and the internal timebase is adjusted until the marker reads 10.0000000 MHz +/- 0.5 Hz. A timestamp is placed on the file to show when the 10 MHz reference was adjusted.

A minimum warmup time of 24 hours is required for minimal frequency reference drift.

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Required Test Equipment

Test Equipment	Recommended Model Number
Frequency Standard	5071A
20 dB Fixed Attenuator	8491A Option 020
Type-N Cable	11500C
Type-N (m) to BNC (f) adapter	1250-1476

Connection Setups

In the following setups, cables are designated as solid lines and direct connections are designated as dashed lines.

10 MHz Internal Frequency Reference Adjustment

This adjustment applies to the following models:

Required Test Equipment

Connection Setups

10 MHz Internal Frequency Reference Adjustment Setup