Keysight M937xA PXIe Service Guide 2-35
Tests, Adjustments, and Troubleshooting
Performance Tests
Source Power Linearity Test
Function of the Test
To verify that the power level is linear over the analyzer’s frequency range and
to check the linearity of the automatic leveling control (ALC).
Specification Tested
Power Sweep Range and Power Level Linearity
Equipment Used
-Test cable
-Any necessary adapters
Description of the Test
Ports 1 and 2 are tested as a pair. The Port 2 receiver is used to test the
linearity of the source power out of Port 1, and vice versa. The receiver linearity
is the standard against which the source linearity is checked.
1. The analyzer is Preset.
2. The analyzer is set up for a CW transmission measurement on the test port
to be measured.
3. A test cable is connected between the port pair to be tested with 20 dB of
attenuation in series with the cable. This is done with an external 20 dB
attenuator. This attenuation ensures that the receiver remains in its linear
range.
4. The receiver measurement is normalized at this Preset power level.
5. The source setting is then stepped from the minimum to the maximum ALC
power setting range in 1 dB steps, and the receiver power is measured at
each setting.
6. The non-linearity in dB at each frequency point is calculated as the
difference between the change in the source power setting away from
Preset and the change in the receiver power reading.
7. This power linearity measurement is repeated at several CW frequencies
across the full frequency range of the analyzer.
If the Analyzer Fails this Test
-Perform the “Source Adjustment” on page 2-46 and repeat this test.
- If the analyzer still fails this test, return it to Keysight for repair. Refer to
“Shipping Your Network Analyzer for Service or Repair” on page 1-3.
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