Keysight M937xA PXIe Service Guide 2-31
Tests, Adjustments, and Troubleshooting
Performance Tests
Source Power Accuracy Test
Function of the Test
To confirm the accuracy of the source output power of your network analyzer
over its full frequency range.
Specification Tested
Test Port Output – Power Level Accuracy
Equipment Used
- Components for the PNAasPowerMeter
1
:
— PNA (N5241A/42A, or N5221A/22A, or E8363C/64C
2
)
— 10 dB attenuator
— 3.5 mm (-m- to -f-) test cable
- Components for calibrating the PNAasPowerMeter:
— U8485A USB Thermocouple Power Sensor (or N8485A power sensor
with N1912A/13A/14A power meter)
— ECal module (N4691B)
Description of the Test
1. The PNA, with cable and 10 dB attenuator, is calibrated for use as a highly
accurate, tuned power meter. This set is referred to as PNAasPowerMeter.
2. The analyzer is Preset.
3. The analyzer is set up for a CW reflection measurement on the test port to
be measured.
4. The PNAasPowerMeter is connected to the test port.
5. The analyzer frequency is set to the desired value.
6. The PNAasPowerMeter is set to the same frequency.
7. The output power is measured, and the value is compared to the Preset
setting.
8. This process is repeated at hundreds of frequencies across the full range of
the analyzer. The difference between the measured power and the output
setting must be within the specified accuracy range at all points for the test
to pass.
1. Refer to Power Measurement Receiver System (PNAasPowerMeter).
2. Refer to Get the Hardware Required for your GPIB Instruments.
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