HP HP 8753E, Руководство пользователя, Страница: 387 / 699

The speed and accuracy of a power meter calibration vary depending on the test setup and the
measurement parameters. For example, number of points, number of readings, if the power is
less than -20 continuous versus sample and sweep mode. Accuracy is improved if you
set the source power such that it is approximately correct at the measurement port. Power
meter calibration should then be turned on. With number of readings 2, very accurate
measurements are achieved.
6-7 shows typical sweep speed and power accuracy. The times given apply only to the
test setup for continuous correction or for the first sweep of sample-and-sweep correction.
The typical
given in 6-7 were derived under the following conditions:
Equipment Used
HP 8753E network analyzer
n
HP power meter
n
HP power sensor
Stimulus Parameters
The time required to perform a power meter calibration depends on the source power and
number of points tested. The parameters used to derive the typical values in 6-7 are as
follows:
number of points: 51, 300 to 3
n
test port power: equal to calibration power
6-7.
Characteristic Power Meter Calibration Sweep Speed and Accuracy
Power Desired Number
of Sweep Time Characteristic
at
Port Accuracy
1 33
2
I I
3 I 96
fO
.l
1 43
l
0.7
-16 2 92
3 123 fO.l
1 194
-30 2 360
3 447 fO.l
1 Sweep speed applies to every sweep in continuous correction mode, and
to the sweep in sample-and-sweep made. sweeps in
sample-and-sweep mode will be much faster.
2 The were derived by combining the of the
power meter and of the analyzer’s internal source, as well as
the uncertainty associated with the power sensor.
Application and Operation Concepts