3-38 Service Guide E8361-90001
Tests and Adjustments PNA Series Microwave Network Analyzers
Performance Tests (Agilent N2721A Software Package) E8361A
4. Setup the digital voltmeter (DVM) as follows:
a. Reset the DVM: Press the blue key followed by Reset.
b. Set the sample period to a value greater than one second: Press NPLC, 5, 0, then
Enter.
5. Set the range calibrator controls as follows:
POLARITY . . . . . . . . . . . . . . . . . . . NORMAL
RANGE . . . . . . . . . . . . . . . . . . . . . . 1 mW
FUNCTION. . . . . . . . . . . . . . . . . . . CALIBRATE
6. Allow the equipment to warm up for approximately 30 minutes. Do not change any
connections or control settings during this time.
7. Zero and calibrate the power meter channel to which the range calibrator is connected:
a. The range calibrator’s RANGE switch should be set to 1 mW.
b. Set the range calibrator’s FUNCTION switch to STANDBY.
c. Press [Zero/Cal], then Zero A or Zero B (as appropriate). Wait for the operation to
complete.
d. Set the range calibrator’s FUNCTION switch to CALIBRATE.
e. Press [Zero/Cal], Cal, then Cal A or Cal B (as appropriate). Wait for the operation to
complete.
8. Monitor the drift rate of the power meter reading: Five minutes following calibration,
the meter must read 0.001, 0.000, or −0.001 dBm. If the power meter reading is not one
of these values, allow additional warm up time, then check the drift rate again. The
range calibrator must remain connected to the power meter during this warm up time.
9. Zero and calibrate the power meter channel to which the range calibrator is connected:
NOTE After a channel on the power meter is calibrated, do not allow more than 5
minutes to elapse before completing the remaining measurement steps for
that channel.
a. The range calibrator’s RANGE switch should be set to 1 mW.
b. Set the range calibrator’s FUNCTION switch to STANDBY.
c. Press [Zero/Cal], then Zero A or Zero B (as appropriate). Wait for the operation to
complete.
d. Set the range calibrator’s FUNCTION switch to CALIBRATE.
e. Press [Zero/Cal], Cal, then Cal A or Cal B (as appropriate). Wait for the operation to
complete.
10. Record the DVM voltage reading as value A in the test record on page 3-40.
NOTE All DVM readings in this procedure should be recorded showing five
significant digits.
11. The reading on the power meter should be 0.000 ±0.001 dBm.
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