Series 8650B Universal Power Meters
4-6
Publication 31470-001, Rev C, November 2, 2017
4.4.2.2
Setup Parameters
The following setup parameters should be accomplished prior to performing the Power Linearity test:
1.
The 8650B and sensor should be calibrated (See Section 2.4.3: Sensor Calibration & Zeroing. Refer also
to the complete instructions on how remotely calibrate the sensor in Appendix A.3 of this publication).
2.
The Averaging is set to AUTO by entering the key sequence:
[Sensor Setup]
select Sensor A or B
[Avg]
set the number of Periods
[Averages] [Auto]
4.4.2.3
Test Procedure
Extreme care is required in the following procedure since the accuracy requirements are critical to ensure the
most accurate test results.
Power readings are determined using the thermistor power meter in the same general way as given in the
Power Reference Level test. That is, P1 and P2 north Power Meter reading column of the Performance
Verification Test Data Sheet tables are calculated each time for the respective values of V
COMP
, V
0
, and V
1
read on
the DVM.
1.
Set the step attenuator to 70 dB. Turn the source power output off, and then zero the 8650B.
(The 8650B is zeroed by pressing
[CAL/ZERO]
and then following the softkey label instructions.)
2.
Set the step attenuator to 0 dB after the 8650B has zeroed.
3.
Set the power output of the RF source so that the thermistor power meter indicates 1.00 mW ±0.025
mV.
4.
Record the calculated power meter reading and the displayed 8650B reading in the correct columns of
the Linearity Data recording sheet on page 4-8.
5.
Set the power output of the RF source so that the thermistor power meter indicates 3.98 mW ±0.10
mW.
6.
Record the new calculated power meter reading and the new displayed 8650B reading as in Step 4
above.
7.
Set the power output of the RF Source so that the thermistor power meter indicates 5.01 mW ±0.13
mW.
8.
Record the new calculated power meter reading and the new displayed 8650B reading as in Step 4
above.
9.
Repeat using the power meter indications in the Performance Verification Data Sheet on page 4-9. Note
that the Step Attenuator is used to generate the remaining 70 dB range of 10 dB steps for a total range
of 80 dB. Repeat Step 1, above, between each 10 dB step shown on the Linearity Data Recording sheet.
10.
Make the calculations indicated on the Linearity Data sheet, and enter the values in the appropriate
blank spaces.
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