Performing Auto Measurements; Setting Limit For Auto Measure - JDS Uniphase CellAdvisor JD780A Series User Manual

JD780A Series Analyzers
Waveform quality (Rho)
Carrier feed through
Pilot power
Highest level among inactive channels
4.
Optional. You can enable alarm sound that goes off if the measurement falls outside of the limit.
Toggle the Beep soft key between On and Off to enable or disable the beep sound.
5.
Optional. Go to SAVE/LOAD > Save, and then select Limit to save the limit settings.
See "Using save" on page 31 for more information.
NOTE
The Time Offset compares the PN offset timing with the overall system time and the
instrument checks the start of PN offset in comparison to either the GPS signal or the
even second clock signal.
NOTE
The Rho measures the modulation quality for a CDMA transmitter along with EVM and
Walsh Channel Power. It includes all errors occurred along the transmitter chain such as
base band filtering, abnormality of I/Q modulator and distortion in power amplifier. A
perfect Rho value is 1.0 indicating that all of the power is being transmitted correctly.
NOTE
The Carrier Feed Through is a result of the RF carrier signal feeding through the I/Q
modulator and riding on the output circuitry without being modulated.

Performing auto measurements

The Auto Measure function of the JD780A series allows a complete signal profiling covering RF
characterization and modulation quality parameters of up to 10 different carriers, particularly useful on
an overlay architecture where base stations are transmitting in different frequencies.
The Auto Measure can be easily executed either by selecting a menu in the instrument or by running a
programmed scenario in the PC-based application so that the instrument automatically configure and
perform tests on every aspect of all the carriers.

Setting limit for auto measure

You can set test limits for test item(s) in the auto measurement.
Procedure
1.
Press the LIMIT hot key.
2.
Press the RF Test Limits soft key, and then enable test limits as desired.
3.
Press the Modulation Test Limits soft key, and then enable test limits as desired.
4.
Optional. You can enable alarm sound that goes off if the measurement falls outside of the limit.
Toggle the Beep soft key between On and Off to enable or disable the beep sound.
5.
Optional. Go to SAVE/LOAD > Save, and then select Limit to save the limit settings.
See "Using save" on page 31 for more information.
356
Rho
Carrier Feed Through
Pilot Power
Max Inactive
Using CDMA Signal Analyzer
Low Limit
High Limit
High Limit [Abs|Rel]
Low Limit [Abs|Rel]
High Limit