Agilent Technologies E8285A TM Rho, TM Test Mode Rho, Queries the current Rho measurement result

Chapter 4, Description of Fields

Fields

TM Rho

This field displays the mobile station’s measured waveform quality factor, Rho.

Rho can be measured in either of two available modes.

•Traffic Rho

Traffic Rho measures Rho when the mobile station is transmitting a reverse traffic channel. The Connected annunciator on the CDMA CALL CONTROL screen must be lit.

•TM (Test Mode) Rho

TM (Test Mode) Rho measures Rho when the CDMA mobile station is transmitting an unmodulated RF signal (short-spreading PN sequence only). This measurement can only be made on mobile stations with a non-industry-standard test mode provided by some mobile station manufacturers. Refer to the mobile station’s service documenta- tion for key sequences or bus commands used to put the mobile station in this mode.

The only code channel output by the Test Set during TM Rho measurements is the pilot channel. The pilot channel provides a time reference for the mobile station, and once the mobile station acquires (synchronizes to) the pilot channel, Rho measure- ments can be made.

GPIB Example

“DISP CTXT;CDMA:MEAS:RHO ‘Traffic Rho’”

selects Traffic Rho as the current Rho measurement.

“DISP CTXT;MEASure:CDManalyzer:RHO?“

queries the current Rho measurement result.

GPIB commands for selecting rho measurement modes are not available yet.

Operating Considerations

Rho is defined as the percentage of the mobile station’s signal waveform that cross-correlates with an ideal signal waveform carrying the same data.

The default Rho measurement, Traffic Rho, should be used whenever a mobile station is capable of making a call. A Rho of 0.9444 or greater is required for the mobile station to meet EIA/TIA IS-98 standards.

Screens Where Field is Present

CDMA CELLULAR MOBILE TRANSMITTER TEST

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