Performance Tests 2
Keysight E4416A/E4417A Power Meters Service Guide 63
1 Record the input VRC magnitude of the thermistor mount at 50 MHz with the
Keysight 432A power meter set to 200 Ω:
– |R1| ___________
2 Record the input VRC magnitude of the thermistor mount at 50 MHz with the
Keysight 432A power meter set to 100 Ω:
– |R2| ___________
3 Set the Keysight 432A mount resistance switch to 200 Ω.
4 Set the DVM to measure resistance:
Connect the DVM between the VRF connector on the rear panel of theKeysight
432A and pin 1 on the thermistor mount end of the sensor cable. Verify that no
power is applied to the Keysight 432A.
5 Round off the DVM reading to two decimal places. Record this value as the
first internal bridge resistance (R
1
) of the Keysight 432A:
–R
1
___________ Ω
6 Set the Keysight 432A mount resistance switch to 100 Ω.
7 Round off the DVM reading to two decimal places. Record this value as the
second internal bridge resistance (R
2
) of the Keysight 432A:
–R
2
___________ Ω
8 Set the Keysight 432A mount resistance switch to 200 Ω.
9 Connect the equipment as shown in Figure 2-10 ensuring that the DVM input
leads are isolated from chassis ground.
Steps 1 to 7 of this procedure require pre-requisite knowledge of some Keysight
432A and 478A parameters. Refer to Appendix A for further information.
Ensure that the Keysight 432A and the power meter under test have been
switched on for at least 30 minutes before performing the following steps.
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