10 MHz Internal Reference Adjustment

This adjustment applies to the following models:

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

For this test, the output of a 10 MHz frequency standard is connected to the DUT RF input. The DUT 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.

Required Test Equipment

Test Equipment

Model Number1

Frequency Standard

Microsemi 5071A-C002

Fixed Attenuator, 20 dB

8491A Option 020

Cable, BNC

8120-1840

Adapter, Type-N (m) to BNC (f)

1250-1476

Adapter, Type-N (f) to 3.5 mm (f)

  • For Option C35

1250-1745

Adapter, Type-N (f) to 2.4 mm (f)

  • For Option 544

11903B
  1. Refer to the main Required Equipment table for a list of alternative models.

Connection Setups

10 MHz Internal Reference Adjustment Setup