User's Manual

Power Delta Calibration – continued
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
H-12
HP8921A Power Delta
Calibration
Use the HP8921A communications test set to measure power during ISC
only for IS–95A and B operation of 800 MHz systems. After the offset
value has been calculated, add it to the TX cable loss value.
Follow the procedure in Table H-4 to perform the HP8921A Power Delta
Calibration procedure.
This procedure requires two HP8921A communication test
sets.
NOTE
Table H-4: HP8921A Power Delta Calibration Procedure
Step Action
* IMPORTANT
Perform this procedure after test equipment has been allowed to warm–up and stabilize for a minimum
of 60 minutes. After it is warmed up and stabilized, calibrate the test equipment as described in the
“Test Set Calibration” section of Chapter 3.
1
Zero the Power Meter prior to connecting the power sensor to the RF cable from the signal generator.
* IMPORTANT
For best accuracy, always re–zero the power meter before connecting the power sensor to the
component being calibrated.
2 Connect a short RF cable between the HP8921A Duplex Out port and the HP437 power sensor (see
Figure H-7).
3 Set the HP8921A signal source as follows:
– Measure mode to CDMA Generator
– Frequency to the CDMA Calibration target frequency
– CW RF Path to IQ
– Output Port to Dupl
– Data Source to Random
– Amplitude to 0 dBm
4 Measure and record the power value reading on the HP437 Power Meter.
5 Record the Power Meter reading as result A ________________________.
6 Turn off the source HP8921A signal output, and disconnect the HP437.
NOTE
Leave the settings on the source HP8921A for convenience in the following steps.
7 Connect the short RF cable between the source HP8921A Duplex Out port and the measuring
HP8921A RF–IN port (see Figure H-8).
8 Ensure that the source HP8921A settings are the same as in Step 3.
. . . continued on next page
H