Agilent Technologies E8285A manual Attack Time, Queries the Cdma gated power attack time

Chapter 4, Description of Fields

Fields

See Also

“Measurement Triggering Process” in the Operating Overview chapter of the E8285A User’s Guide

Disarm field description, on page 223

Screens Where Field is Present

CDMA CELLULAR MOBILE RECEIVER TEST

CDMA CELLULAR MOBILE TRANSMITTER TEST

CDMA GATED POWER

Attack Time

This field displays the time period between the -20 and -3 dB points of the rising edge of an ensemble average of CDMA RF bursts. This field will display a value only after a gated power measurement is made.

GPIB Example

“MEAS:GPOWer:ATTack:TIME?”

queries the CDMA gated power attack time.

Operating Considerations

When a mobile station is operating in variable data rate transmission mode, the RF power is gated on during randomized 1.25 ms periods. During a CDMA Gated Power measurement the mobile station transmits eighth-rate data. The Test Set analyzes an ensemble of gated-on periods, referred to as bursts with the number of bursts controlled by the "Averages" field on page 178.

The attack time represents the slope of the rising edge of the RF power, which is required to conform to a transmission envelope mask. This mask is displayed as a graph on the CDMA Gated Power screen and shows whether the burst is within the limits specified in test standards. The Attack Time field provides a convenient way to observe or programmatically query the time period of the burst’s rising edge.

Screens Where Field is Present

CDMA GATED POWER

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