1 Performance Tests - Verifying Specifications46 Keysight 53147A/148A/149A Assembly Level Service GuidePower Meter Reference Level: Method 2Equipment RequiredKeysight 432A Power MeterKeysight 478A-H75 or 478A-H76 Thermistor MountKeysight 34401A Digital MultimeterKeysight 8120-1082 Power Sensor Cable1 Turn the Keysight 432A Power Meter off. Do not turn it on until instructed to doso.2 Set the Keysight 34401A Digital Multimeter to measure resistance, andconnect the DVM test prods between the center pin of the VRF connector onthe Keysight 432A Power Meter rear panel and pin 1 on the thermistor-mountend of the Keysight 8120-1082 Power Sensor Cable (see Figure 1-10 to locatepin 1).Figure 1-10 Keysight 8120-1082 Power Sensor Cable End View3 Round off the resistance reading to two decimal places and keep a record ofthis value as R. It is the internal bridge resistance (R) of the Keysight 432APower Meter (this should be approximately 200.3 ohms).4 Connect the Keysight 478A-H75 or 478A-H76 Thermistor Mount to theKeysight 53147A/148A/149A Power Meter OUTPUT connector, as shown inFigure 1-11.NOTE – To ensure that the test results are valid, the instrument and the testequipment should be powered on for at least 30 minutes prior to beginningthe tests. This allows the internal temperatures of the equipment to stabilize.– This test is appropriate for the Keysight 53147A, 53148A, and 53149A.6 53124
