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Chapter 4, Troubleshooting
Questionable Measurement Results
Questionable Measurement Results
Overview Refer to the topics in this section if you are seeing measurement results with no
indicated errors, but you are failing a test or you believe you’re getting erroneous
results. The following pages list some common sources of measurement errors for
each type of test.
Average Power Potential causes of measurement error in average power readings include:
Cable loss values are incorrect
Since the Software will compensate for the cable loss between your base station’s
transmitter test port and the Test System, it is very important that you have the
correct values entered into the Configuration Information Menu.
You can view the loss value in the Average power menu. If they do not match
your setup (do not forget to allow for losses through couplers, attenuators, and so
forth) go to the
Configuration Information Menu and enter the correct
value under TX Measurement Path Loss.
Power meter not zeroed recently
Periodically, you should zero the power meter. This is done by pressing the
Zero Pow (k1) key while in the Average power menu.
Measurement units are incorrect
Verify that the measurement display is reporting in the units that you expect for
this test (choices are Watts, milliwatts, and dBm). The displayed units can be
changed in the Average power menu using USER keys k2, k3, and k4.
Input signal is outside the measurement range of the PCS Interface
The specified range for average power measurements with the PCS Interface is
−13 to +30 dBm (50 µW to 1 W) when testing CDMA base station transmitters.
Verify that the signal applied to the RF IN/OUT port of the PCS Interface falls
within this range before continuing with your tests. You can use the
Go To
Spectrum Analyzer
modes to view the transmitted signal.
Connections are missing or faulty
Make sure that you have connected your transmitter signal to the RF IN/OUT port
on the front panel of the PCS Interface.