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N o t e
The sweep time (ST) that is displayed in the lower portion of the display is the
time for the WDCA to sweep over one gain stage. The WDCA may take up to
three sweeps in three different gain stages to make the measurement. This
depends on the settings for sensitivity, reference level, auto range and also the
particular device being measured. The final data trace is a blended composite
of each trace taken in the different gain stages. For more information, refer to
"Increase in Sweep Time" on page 3-32.
Setting Auto Range to off will force the WDCA to use a single gain stage and
achieve the desired sensitivity by applying a digital filter.
Key Path
Amplitude > Amplitude Setup > Auto Range
Auto Zero (Amplitude Setup Panel)
Turns Auto Zero on and off. Auto Zero on enables the internal amplifiers to be
zeroed between sweeps. In this mode, the analyzer compensates for tempera-
ture-related current drift between each sweep. Although this "zeroing"
increases amplitude accuracy, it also increases the time between sweeps. If
amplitude accuracy is not critical to your measurement, turning off auto zero
will improve throughput. Pressing the front-panel Preset key resets this func-
tion to on.
Tip: The analyzer performs a more complete zeroing when the instrument is
first turned on. You can run this more complete routine anytime by pressing
the Zero Now softkey.
Key Path
Amplitude > Amplitude Setup > Auto Zero
Related Functions
Zero Now
Remote
CALibration:ZERO
Commands
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Function Reference
Auto Zero (Amplitude Setup Panel)
2-9
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