Keithley 2002 User Manual

IEEE-488 Reference
3-94
:AUTO <b>|ONCE
[:SENSe[1]]:CURRent:AC:APERture:AUTO <b>|ONCE Control auto aperture for ACI
[:SENSe[1]]:CURRent:DC:APERture:AUTO <b>|ONCE Control auto aperture for DCI
[:SENSe[1]]:VOLTage:AC:APERture:AUTO <b>|ONCE Control auto aperture for ACV
[:SENSe[1]]:VOLTage:DC:APERture:AUTO <b>|ONCE Control auto aperture for DCV
[:SENSe[1]]:RESistance:APERture:AUTO <b>|ONCE Control auto aperture for Ω2
[:SENSe[1]]:FRESistance:APERture:AUTO <b>|ONCE Control auto aperture for Ω4
[:SENSe[1]]:TEMPerature:APERture:AUTO <b>|ONCE Control auto aperture for TEMP
<b> = 1 or ON Enable auto aperture
0 or OFF Disable auto aperture
ONCE Enable and then disable auto aperture
:AUTO? Query state of auto aperture.
These commands are used to enable or disable auto aperture for the specified measurement func-
tion. With auto aperture enabled, the instrument automatically optimizes the aperture value for
the present resolution setting. This is the same as selecting SET-BY-RSLN from the front panel
(see paragraph 2.4).
Tables 2-8, 2-13, 2-18 and 2-24 provide the integration times for SET-BY-RSLN (AUTO). Note
that the times are provided as NPLC values. To convert to aperture times, use the formula in
paragraph 3.18.5.
The ONCE parameter is analogous to a momentary toggle switch. When :AUTO ONCE is sent,
auto aperture turns on momentarily and then disables. While enabled, it automatically selects
the appropriate value as summarized in the tables. When auto aperture disables, the aperture
remains at the selected value.
:APERture:AUTO is coupled to the command that manually sets the aperture value (:APERture
<n>). When auto aperture is enabled, the parameter value for :APERture <n> changes to the
automatically selected aperture value. Thus, when auto aperture is disabled, the aperture
remains at the automatically selected value. Also, a valid aperture value sent using the
:APERture <n> command disables auto aperture.
Auto aperture is also coupled to auto NPLC. Enabling or disabling auto aperture also enables or
disables auto NPLC. Also, a valid NPLC value sent using the :NPLC command disables auto
aperture.
PRINT #1, "output 16; :curr:ac:aper:auto on; auto?" ' Enable auto APER for ACI
PRINT #1, "enter 16" ' Get response from 2002
:NPLCycles <n>
[:SENSe[1]:CURRent:AC:NPLCycles <n> Set NPLC for ACI
[:SENSe[1]]:CURRent:DC:NPLCycles <n> Set NPLC for DCI
[:SENSe[1]]:VOLTage:AC:NPLCycles <n> Set NPLC for ACV
[:SENSe[1]]:VOLTage:DC:NPLCycles <n> Set NPLC for DCV
[:SENSe[1]]:RESistance:NPLCycles <n> Set NPLC for Ω2
[:SENSe[1]]:FRESistance:NPLCycles <n> Set NPLC for Ω4
[:SENSe[1]]:TEMPerature:NPLCycles <n> Set NPLC for TEMP
<n> = 0.01 to 50 Power line cycles per integration
DEFault 1
MINimum 0.01
MAXimum 50
Parameters
Query
Description
Program fragment
3.18.6
Parameters

Keithley 2002 Specifications

General

Brand	Keithley
Model	2002
Category	Multimeter
Language	English