Keithley 2001 Operator's Manual page 276

IEEE-488 Reference
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Auto aperture; ACV
Measurement type
RMS, average
RMS, average
RMS, average
RMS, average
RMS, average
RMS, average
Low freq RMS
Low freq RMS
Peak, positive and negative spikes
Peak, positive and negative spikes
* Auto resolution disabled.
** The currently selected aperture value is not used for this measurement type.
Programming example
4-118
Resolution
7H digits*
6H digits*
5H digits*
4H digits*
3H digits*
Auto resolution enabled
Any*
Auto resolution enabled
Any*
Auto resolution enabled
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
Auto aperture; DCV,
Resolution
7H digits*
6H digits*
5H digits*
4H digits*
3H digits*
Auto resolution enabled
* Auto resolution disabled.
10 OUTPUT 716; ":curr:ac:aper:auto on; auto?"
20 ENTER 716; A$
30 PRINT A
40 END
Line 10 Enables auto aperture and then queries auto aperture.
Line 20 Addresses the Model 2001 to talk.
Line 30 Displays the state of auto aperture (1).
Aperture value
(Auto Aperture Enabled)
166.67msec (60Hz)
200msec (50Hz and 400Hz)
166.67msec (60Hz)
200msec (50Hz and 400Hz)
333.33µsec (60Hz)
400µsec (50Hz and 400Hz)
166.67µsec (60Hz)
200µsec (50Hz and 400Hz)
166.67µsec (60Hz)
200µsec (50Hz and 400Hz)
16.67msec (60Hz)
20msec (50Hz and 400Hz)
Selection not used**
Selection not used**
Selection not used**
Selection not used**

2 and 4
Aperture value
(Auto aperture enabled)
33.33msec (60Hz)
40msec (50Hz and 400Hz)
3.33msec (60Hz)
4msec (50Hz and 400Hz)
333.33µsec (60Hz)
400µsec (50Hz and 400Hz)
166.67µsec (60Hz)
200µsec (50Hz and 400Hz)
166.67µsec (60Hz)
200µsec (50Hz and 400Hz)
16.67msec (60Hz)
20msec (50Hz and 400Hz)
2001-900-01 Rev. K / August 2010