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QPSK EVM Measurement
Meas Setup
IF Gain
In order to take full advantage of the RF dynamic range of the test set, we will offer a switched IF
amplifier with approximately 10 dB of gain. When it can be turned on without an overload, the dynamic
range is always better with it on than off. The IF Gain key can be used to set the IF Gain function to
Auto, or to On (the extra 10 dB) or Off. These settings affect sensitivity and IF overloads.
Sets the IF Gain function to Auto, Low Gain or High Gain. These settings affect sensitivity and IF
overloads.
This only applies to the RF input. It does not apply to baseband I/Q input.
IF Gain Auto
Activates the auto rules for IF Gain
Preset WCDMA: 3.84 MHz
C2K: 1.2288 MHz
1xEVDO: 1.2288 MHz
State Saved Saved in instrument state.
Min 100 kHz
Max 20 MHz
Instrument S/W Revision Prior to A.02.00
Key Path
Meas Setup, Advanced
Instrument S/W Revision Prior to A.02.00
Remote Command [:SENSe]:EVMQpsk:IF:GAIN:AUTO[:STATe] ON|OFF|1|0
[:SENSe]:EVMQpsk:IF:GAIN:AUTO[:STATe]?
Example EVMQ:IF:GAIN:AUTO OFF
EVMQ:IF:GAIN:AUTO?
Key Path
Meas Setup, Advanced, IF Gain
Mode WCDMA, C2K, 1xEVDO
Notes This only applies to the RF input. It does not apply to baseband I/Q input.
Couplings 'When either the auto attenuation works (for example, with electrical
attenuator), or the optimize mechanical attenuator range is requested, the IF
Gain setting is changed as following rule.
Auto sets IF Gain to On under any of the following conditions: the input
attenuator is set to 0 dB, the preamp is turned on, or the Max Mixer Level is
–20 dBm or lower. For other settings, Auto sets IF Gain to Off.
Preset ON