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frequency, bandwidth, and temperature by using the broadband power meter to correct the in-band
power measurement. This correction occurs when an in-band user calibration is performed.
Procedure:
1
Press the
UTILS
button on the service monitor twice.
NOTICE:
Wait for approximately 1 second or more before pressing the
UTILS
button the
second time.
The
Utility Menu
screen appears.
2
From the menu, select
User Calibration
.
The
User Calibration
screen appears.
3
Click
Run User Calibration
in the upper right corner of the
User Calibration
screen.
NOTICE:
The default user calibration setting is 1.0 dB. This setting means that a user re-
calibration is not indicated on the HPD service monitor until the in-band power
measurement has a potential of 1.0 dB error in the measurement (same as the basic in-
band power meter accuracy). For HPD, a 0.5 dB value or lower is more appropriate. This
value may require more frequent re-calibrations, but it provides better performance.
A
User Calibration
message box appears instructing you to remove all connectors from the
ports.
4
Remove all connectors from the ports. Click
Continue
.
A progress bar appears showing the progress of the calibration process. The calibration
completes in approximately 2 min.
NOTICE:
Failure to remove all connectors and cables from the ports causes an
inaccurate user calibration. Any connectors present causes a variation on the impedance
seen by the instrument during calibration.
5.12.3
Measuring HPD Base Radio Tx Power, Frequency Accuracy, and Tx
EVM
Procedure:
1
Perform the High Performance Data (HPD) service monitor setup steps in
Service Monitor for Testing the Base Radio on page 198
2
Configure the service monitor T/R port to receive transmissions from the base radio, as follows:
• Click the
T/R
soft key under
RF In
on the right side of the screen.
3
Maximize the
RF Control Settings
window, by clicking the upper left corner of the window.
MN003286A01-E
Chapter 5: GTR 8000 Base Radio Optimization
200