User Manual

Calibrating Output Power68P09255A57-2
Aug 2002
SC4812ET Optimization/ATP Manual Software Release R16.1.x.x
PRELIMINARY
G-3
HP8921A Power Delta Calibration
Use the HP8921A Spectrum Analyzer to measure power during
In-Service Calibration for 800 MHz systems. After the offset value has
been calculated, add it to the TX cable loss value.
Follow the procedure in Table G-1 to perform the HP8921A Power Delta
Calibration procedure.
NOTE
This procedure requires two HP8921As.
Table G-1: 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.
1 Connect a short RF cable between the HP8921A Duplex Out port and the HP437B power sensor (see
Figure G-1).
2 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
3 Measure and record the power value reading on the HP437B Power Meter.
4 Record the Power Meter reading as result A ________________________.
5 Turn off the source HP8921A signal output, and disconnect the HP437B.
NOTE
Leave the settings on the source HP8921A for convenience in the following steps.
6 Connect the short RF cable between the source HP8921A Duplex Out port and the measuring
HP8921A RF-IN port (see Figure G-2).
7 Ensure that the source HP8921A settings are the same as in Step 2.
8 Set the measuring HP8921A as follows:
- Measure mode to CDMA Anl
- Frequency to the CDMA calibration target frequency
- Input Attenuation to 0 dB
- Input port to RF-IN
- Gain to Auto
- Analyzer Direction to Fwd
9 Turn on the source HP8921A signal output.
10 Measure and record the channel power reading on the measuring HP8921A as result
B ________________________.
11 Turn off the source HP8921A signal output and disconnect the equipment.
. . . continued on next page
G