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Agilent 432A Power Meters & 478A Sensors: Additional Information
Appendix A
Appendix A
Agilent 432A Power Meters: Additional Information
The internal bridge resistance of the Agilent 432A can be set to either
200Ω or 100Ω. It is important that this value is measured accurately
(rounded to the nearest 0.01Ω) and recorded for use in the following tests:
• Power Reference Level Test.
• Output Standing Wave Ratio (SWR) Test.
Before attempting to measure the internal bridge resistance of the Agilent
432A, verify that no power is applied to the unit. Connect a DVM (set to
measure resistance) between the V
Agilent 432A and pin 1 on the thermistor mount end of the sensor
cable.The Agilent 432A front panel MOUNT RESISTANCE switch
determines which bridge resistance is selected.
For reference only, typical bridge resistance values are as follows:
• R
• R
Using incorrect resistance values in these calculations will introduce
Note
significant errors.
Agilent 478A Sensors: Additional Information
The Voltage Reflection Coefficients (VRC) of the Agilent 478A sensor must
be known before attempting to perform the Output Standing Wave Ratio
(SWR) Test. The VRC values required for this test are as follows:
• Frequency 50 MHz, with the mount resistance of the Agilent 432A set
• Frequency 50 MHz, with the mount resistance of the Agilent 432A set
For reference only, typical values of these VRC values are as follows:
• |Γ
• |Γ | ≅ 0.3317
Note
Using incorrect VRC values in the Output SWR calculations will
introduce significant errors.
A-2
≅ 200.05Ω.
200
≅ 100.25Ω.
100
to 200Ω (recorded as |Γ
to 100Ω (recorded as |Γ
| ≅ 0.0012
1
2
connector on the rear panel of the
RF
|).
1
|).
2
Agilent E4416A/E4417A Service Guide
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