Frequency Reference Accuracy Performance Test

This test applies to the following models:

The instrument is turned ON, set to Internal Reference mode, and allowed to warm up for 30 minutes (except for CXA with Option PFR is 15 minutes and all other models with Option PFR is 4 hours). The frequency of the 10 MHz Reference is measured at the DUT's rear-panel port using a frequency counter which is locked to a primary frequency standard. The measured value is compared to the allowable offset guideline and is included in the Performance Test printout.

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Required Test Equipment

Test Equipment

Recommended Model Number

Universal Counter

53230A 

Frequency Standard1

5071A 

BNC Cable (2 required)

8120-1840 
  1. 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 N7800A TME Help for instructions.

Connection Setups

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

Frequency Reference Accuracy Test Setup