Agilent Technologies E4418B, Руководство по обслуживанию

Страница: 54 / 154

Performance Tests
Power Reference Level Test
2-18 Agilent E4418B/E4419B Service Guide
4. Preset the power meter:
Press , then on the power meter.
Set the Agilent 432A RANGE switch to Coarse Zero. Adjust the front
panel Coarse Zero control to obtain a zero meter indication.
5. Zero the Agilent 432A test power meter:
• Fine zero the Agilent 432A on the most sensitive range.
• Set the RANGE switch to 1 mW.
6. Set the DVM to measure microvolts.
7. Connect the positive and negative input leads to the V
comp
and V
RF
connectors respectively, on the rear panel of the test power meter.
8. Observe the reading on the DVM. If less than 400
µ
V, proceed to the
next step. If 400
µ
V or greater, press and hold the test power meter
Fine Zero switch and adjust the Coarse Zero control so that the DVM
indicates 200
µ
V or less. Release the Fine Zero switch and proceed to
the next step.
9. Round the DVM reading to two decimal places.
Record this reading as V
0
.
• V
0
___________
10.Turn the power reference on:
Press , .
11.Round the DVM reading to two decimal places.
Record this reading as V
1
.
• V
1
___________
12.Disconnect the DVM negative input lead from the V
RF
connector on the
Agilent 432A. Reconnect it to the Agilent 432A chassis ground.
13.Observe the DVM reading. Record the reading as V
comp
.
• V
comp
__________
14.Calculate the Power Reference Oscillator power using equation 2-4.
15.Verify that P
meas
is within the limits shown in Table 2-5 and record the
reading in the table.
Table 2-5: Power Reference Level Test Result
Min Max Actual Result
0.999
mW
1.001
mW ________________
Preset
Local
Confirm
Zero
Cal
Power Ref On
4402serv.book Page 18 Tuesday, October 14, 2003 3:18 PM