Keysight Technologies M937 A PXIe Series Service Manual

Also see for M937 A Series: Startup guide

Contents

Keysight Technologies M937 A PXIe Series Service Manual Manual pdf 56 page image

2-36 Keysight M937xA PXIe Service GuideTests, Adjustments, and TroubleshootingPerformance Tests2-Frequency Accuracy TestFunction of the TestTo verify the frequency accuracy and range of the analyzer’s source output.Specification TestedTest Port Output – CW AccuracyEquipment Used- Frequency counter 1- Test cable- Any necessary adaptersDescription of the TestThis test is performed at key frequencies over the frequency range of thesource voltage controlled oscillator (VCO), not the full frequency range of theanalyzer. To generate the higher frequencies, the analyzer passes the signalthrough a series of frequency doublers. These doublers exactly double thesource frequency, so the deviation from a perfectly accurate frequency isexactly doubled. The frequency accuracy is specified as the ratio parts permillion (ppm), so this ratio is unaffected by the signal doubling. Therefore, onlythe frequency accuracy of the VCO needs to be tested.1. The analyzer is Preset.2. The analyzer is set up for a CW measurement on Port 1.3. A test cable is connected between Port 1 and a frequency counter with anynecessary adapters.4. The signal frequency is measured and compared with the analyzer sourcefrequency setting. The difference must be less than the source frequencydivided by 106 for a 1 part per million (ppm) specification.5. This test is repeated at several frequencies across the range of the VCO.If the Analyzer Fails this Test- Verify the accuracy of the 10 MHz REF OUT by using a frequency counter. Ifthe 10 MHz reference is off by more than 10 Hz, perform the “10 MHzFrequency Reference Adjustment” on page 2-45 and then repeat this test.1. Refer to Get the Hardware Required for your GPIB Instruments.