2-40 Keysight M937xA PXIe Service Guide
Tests, Adjustments, and Troubleshooting
Performance Tests
2-
Noise Floor Test
Function of the Test
To measure the absolute power level of the noise floor for the receivers.
Specification Tested
Test Port Input – Maximum Test Port Noise Floor
Equipment Used
- 3.5 mm (-m- to -f-) test cable
- 83059A 3.5 mm (-m- to -m-) adapter
- 10 dB attenuator
- 50 ohm loads (available in a mechanical calibration kit)
- 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
— 83059B 3.5 mm (-f- to -f-) adapter
- Components for calibrating the PNAasPowerMeter:
— U8485A USB Thermocouple Power Sensor (or N8485A power sensor
with N1912A/13A/14A power meter
1
)
— ECal module (N4691B)
Description of the Test
This test uses the source signal out of one analyzer test port as part of the
noise floor measurement on another test port. Port 2 is the source port when
measuring the noise floor of Port 1. Port 1 is the source port when measuring
the noise floor of Port 2.
1. The PNA, with cable, adapter, 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 transmission measurement between the
source port and the test port to be measured. The analyzer is set to an IF
bandwidth of 1 kHz and 801 points per sweep.
1. Refer to Power Measurement Receiver System (PNAasPowerMeter).
2. Refer to Get the Hardware Required for your GPIB Instruments.
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