Agilent Technologies N8201A Service Manual download pdf (Page 89)

100

101

Auto Couple 3

Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 89

Auto Ranging

Turns the ADC ranging to automatic which provides the best signal to noise ratio. Auto

Couple All sets the ADC ranging to Autorange. Autorange is usually preferred over Bypass.

Key Path: Auto Couple

State Saved: Saved in Instrument State

Remote Command:

[:SENSe]:ADC:RANGe AUTO

Example:

ADC:RANG AUTO

Autorange (Best S/N)

Turns the ADC ranging to automatic which provides the best signal to noise ratio.

Key Path: Auto Couple, Auto Ranging

State Saved: Saved in Instrument State

Remote Command:

[:SENSe]:ADC:RANGe AUTO

Example:

ADC:RANG AUTO

Bypass (Best £(f))

Turning the ADC ranging to bypass mode allows higher throughput for FFT measurements.

(It can improve FFT measurement speed by 10% to 50%.) Bypass also provides better phase

noise, though the effect is negligible when using swept analysis or for offsets below 300

kHz. The £(f) improvement is a few dB in FFT mode at 800 kHz offset.

Bypass allows triggered FFT measurements to occur at the trigger time instead of following

an autoranging time. Therefore, whenever the trigger selected is anything other than Free

Run, and the Manual:FFT sweep selection is made, the ADC hardware is set to Bypass

regardless of the setting of ADC Ranging. See “Tip: Making Gated FFT Measurements" on

page 78. Another advantage of Bypass is lower IF harmonic distortion, which may be visible

with very high signal levels at the input mixer.

Key Path: Auto Couple, Auto Ranging

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Agilent Technologies N8201A Service Manual Page 89

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