Frequency Reference Accuracy Performance Test

This test determines that the frequency reference is functional,  provides a measured frequency value, suggests that an adjustment be made if the yearly allowable frequency offset value is exceeded.

The instrument is set to Internal Reference mode and is allowed a sufficient warm-up time of 30 minutes while powered on (not in Standby mode). The frequency of the 10 MHz Reference is measured at its rear-panel port using a counter locked to a frequency standard. The measured value is compared to the allowable offset guideline, and is also printed on the Performance Test printout.

Placing the analyzer in Standby mode turns the frequency reference oscillator off, while continuing to provide power to the oven. While keeping the oscillator warm will reduce its stabilization time, it will not cause aging.

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Required Test Equipment

Test Equipment

Model Number

Universal Counter

53230A 

Frequency Standard1

Microsemi 5071A-C002

BNC Cable (2 required)

8120-2582 

  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 Setup