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 55 page image

Keysight M937xA PXIe Service Guide 2-35Tests, Adjustments, and TroubleshootingPerformance TestsSource Power Linearity TestFunction of the TestTo verify that the power level is linear over the analyzer’s frequency range andto check the linearity of the automatic leveling control (ALC).Specification TestedPower Sweep Range and Power Level LinearityEquipment Used- Test cable- Any necessary adaptersDescription of the TestPorts 1 and 2 are tested as a pair. The Port 2 receiver is used to test thelinearity of the source power out of Port 1, and vice versa. The receiver linearityis 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 portto be measured.3. A test cable is connected between the port pair to be tested with 20 dB ofattenuation in series with the cable. This is done with an external 20 dBattenuator. This attenuation ensures that the receiver remains in its linearrange.4. The receiver measurement is normalized at this Preset power level.5. The source setting is then stepped from the minimum to the maximum ALCpower setting range in 1 dB steps, and the receiver power is measured ateach setting.6. The non-linearity in dB at each frequency point is calculated as thedifference between the change in the source power setting away fromPreset and the change in the receiver power reading.7. This power linearity measurement is repeated at several CW frequenciesacross 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.