1081
Meas Setup
Low Gain (Best for Large Signals)
Forces Swept IF Gain to be off.
High Gain (Best Noise Level)
Forces Swept IF Gain to be on.
FFT IF Gain Accesses the keys to set the ranging in the digital IF when doing FFT sweeps. When in Autorange mode,
the IF checks its range once for every FFT chunk, to provide the best signal to noise ratio. You can
specify the range for the best FFT speed, and optimize for noise or for large signals.
When the sweep type is FFT and this function is in Autorange, the IF Gain is set ON initially for each
chunk of data. The data is then acquired. If the IF overloads, then the IF Gain is set OFF and the data is
re-acquired. Because of this operation, the Auto setting uses more measurement time as the test set
checks/resets its range. You can get faster measurement speed by forcing the range to either the high or
low gain setting. But you must know that your measurement conditions will not overload the IF (in the
high gain range) and that your signals are well above the noise floor (for the low gain range), and that the
signals are not changing.
Initial S/W Revision Prior to A.02.00
Key Path Meas setup, ADC Ranging
Example IF:GAIN:SWEP OFF
State Saved Saved in instrument state.
Readback Low Gain
Initial S/W Revision Prior to A.02.00
Key Path Meas setup, ADC Ranging
Example IF:GAIN:SWEP ON
Dependencies The High setting for Swept IF Gain is grayed out when FFT IF Gain is
manually set to Low (not when Low is chosen by the auto-rules).
State Saved Saved in instrument state.
Readback High Gain
Initial S/W Revision Prior to A.02.00
Key Path Meas Setup
Remote Command [:SENSe]:IF:GAIN:FFT[:STATe] AUTOrange|LOW|HIGH
[:SENSe]:IF:GAIN:FFT[:STATe]?