Trace Noise Test - Keysight Technologies M937 A PXIe Series Service Manual

Tests, Adjustments, and Troubleshooting
Performance Tests

Trace Noise Test

Function of the Test
To confirm the stability of a signal in the internal source and receiver system of
your analyzer.
Specification Tested
Test Port Input – Trace Noise Magnitude and Trace Noise Phase
Equipment Used
- A test cable
- Any necessary adapters
Description of the Test
Trace Noise is a calculation of the standard deviation of a 201 point CW
measurement. In a healthy analyzer, this measurement is only affected by the
sampling error of the analog to digital conversion.
Ports 1 and 2 are tested as a pair using S
1. The analyzer is Preset.
2. The analyzer is set up for a 201 point CW transmission measurement for the
port pair to be tested with the specified IF bandwidth (typically 1 kHz). Both
a magnitude and a phase trace are displayed.
3. A test cable is connected between the port pair to be tested.
4. The analyzer is set to a series of CW frequencies across its full frequency
range. The analyzer's trace statistics function is used to calculate the
standard deviation of both the magnitude trace and the phase trace.
5. The standard deviation values are reported as the analyzer's trace noise and
are compared with the Trace Noise magnitude and phase specifications.
If the Analyzer Fails this Test
If the analyzer fails this test, return it to Keysight for repair. Refer to
Your Network Analyzer for Service or Repair" on page
Keysight M937xA PXIe Service Guide
and S measurements.
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