10 MHz Internal Frequency Reference Adjustment

This procedure adjusts the internal 10 MHz Frequency Reference to within ± 0.2 Hz of 10 MHz. This adjustment is necessary when the Frequency Reference Accuracy Performance Test fails.

For this adjustment, the output of a 10 MHz frequency standard is connected to the RF Input of the DUT. The DUT measures the signal and the internal timebase is adjusted until the marker reads 10.0000000 MHz +/– 0.2 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

Recommended Model Number1

Frequency standard2

5071A

Attenuator, 20 dB fixed

8493C Option 020

Cable, BNC (m) to BNC (m)

8120-2582

Adapter, BNC (f) to 3.5 mm (m)

1250-1200
  1. Refer to the main equipment list for a list of alternative models (if available).
  2. If using the 10 MHz External Reference, be sure to update the Additional Properties in TME to the correct frequency accuracy in parts per million (ppm). For example, if overall accuracy is 9e-12, the equivalent is 9e-6 ppm. Refer to the Additional Properties section in the TME Help for instructions.

Connection Setups