Agilent Technologies 8719D, User Manual

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6-7. Characteristic Power Meter Calibration Speed and Accuracy
-16
50
1 Sweep speed applies to every sweep in continuous correction mode, and
to the sweep in sample-and-sweep mode. Subsequent sweeps in
sample-and-sweep mode will be much faster.
The values were derived by combining the accuracy of the
power meter and linearity of the analyzer’s source, as
the mismatch uncertainty with the power sensor.
Notes on
The accuracy values in 6-7 were derived by combining the accuracy of the power meter
and linearity of the analyzer’s internal source, as well as the mismatch uncertainty associated
with the test set and the power sensor.
Power meter calibration measures the source power output (at the measurement port) at a
single stimulus point, and compares it to the calibrated power you selected. If the two values
are different, power meter calibration changes the source output power by the difference. This
process is repeated at every stimulus point. The accuracy of the result depends on the amount
of correction required. If the selected number of readings = 1, the measurement accuracy
is signillcantly affected by a large power change. However, if the selected number of readings
is 1, the power change
on
the second or third reading is much smaller: thus accuracy is much
better.
Set source power approximately correct at the measurement port, then activate power meter
calibration. This method can significantly increase the accuracy of the measurement when the
selected number of readings 1. Smaller accuracy improvements occur with a higher number
of readings. Remember that mismatch errors affect accuracy as well.
Note
Power meter correction applies to one port only; the other port is not
corrected.
Appliwtion and Operation Concepts