Agilent Technologies 4418B Service Manual page 62

Performance Tests
Output Standing Wave Ratio (SWR) Test
2.
3 . Round off the DVM reading to two decimal places. Record this value as
4.
5.
6.
7.
Note Ensure that the Agilent 432A and the power meter under test have
been switched on for at least 30 minutes before performing the
following steps.
8.Preset the power meter:
9.Zero the Agilent 432A test power meter:
10.Set the DVM to measure microvolts.
11.Connect the positive and negative input leads to the V
12.Observe the reading on the DVM:
2-26
(h) Measure the VCR of the thermistor mount =
• Record |Γ | = ________
2
( i ) Disconnect the thermistor mount from the network analyzer.
( j ) Change the 432A mount resistance back to 200R.
Set the DVM to measure resistance:
Connect the DVM between the VRF connector on the rear panel of the
Agilent 432A and pin 1 on the thermistor mount end of the sensor
cable. Verify that no power is applied to the Agilent 432A.
the first internal bridge resistance (R
• R ___________Ω
1
Set the Agilent 432A mount resistance switch to 100Ω.
Round off the DVM reading to two decimal places. Record this value as
the second internal bridge resistance (R
• R ___________Ω
2
Set the Agilent 432A mount resistance switch to 200Ω.
Connect the equipment as shown in Figure 2-7 ensuring that the DVM
input leads are isolated from chassis ground.
Preset
• Press , then
Confirm
Local
• Set the Agilent 432A RANGE switch to Coarse Zero.
• Adjust the front panel Coarse Zero control to obtain a zero meter
indication.
• Fine zero the Agilent 432A on the most sensitive range.
• Set the RANGE switch to 1 mW.
connectors respectively, on the rear panel of the Agilent 432A.
If less than 400 uV, go to step 15. If 400 uV or more, press and hold the
Agilent 432A Fine Zero switch and adjust the Coarse Zero control so
that the DVM indicates 200 uV or less. Release the Fine Zero switch
and go to step 15.
|Γ |
2
) of the Agilent 432A:
1
) of the Agilent 432A:
2
on the power meter.
Agilent E4418B/E4419B Service Guide
and V
comp RF