HP 8530A, Руководство по эксплуатации и программированию, Страница: 100 / 439

Antenna Calibration
Important Note On Antenna Measurements
Before you make actual measurements (with calibration ON), IT IS VIT AL THA T Y OU READ
THE FOLLOWING:
The frequencies you measure must exactly match the frequencies in the cal set le .
F or example , assume you have calibrated from 10 GHz to 11 GHz with a step size of 100 MHz.
The calibrated frequencies in the cal set are:
10.0 GHz 10.6 GHz
10.1 GHz 10.7 GHz
10.2 GHz 10.8 GHz
10.3 GHz 10.9 GHz
10.4 GHz 11.0 GHz
10.5 GHz
Y ou can measure any of these frequencies during the actual measurement. Y ou cannot,
however , measure any other frequencies . F or example , you cannot measure 10.55 GHz. The
receiver does not interpolate between frequencies in the cal set.
This is another reason why Frequency List mode is so useful when performing calibrations .
Entering a known, convenient step size makes it easy to know what frequencies are in the cal
set. Thus , you know precisely which frequencies you can measure with that calibration.
Things to Try
Assume you created a calibration in the Frequency Domain, using the Frequency List mode ,
and you save the cal set to Cal Set Register 1. Now go to the Angle Domain. Some HP 8530A
receivers will now display the message CAUTION: CORRECTION RESET. Simply press 4 CAL 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CORRECTION ON
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CAL SET 1 to turn the calibration ON again. The Frequency Domain
calibration is still valid, even though you are now in the Angle Domain. Y ou can select any of
the frequencies in the original Frequency Domain calibration, and the calibration will remain
valid.
Now change the start and stop angle , notice that the calibration remains valid.
Menus Block 5-17