Keithley 6517B Reference Manual

Section 14: SCPI command reference Model 6517B Electrometer Reference Manual
14-60 6517B-901-01 Rev. C / August 2015
:AUTO <b>|ONCE
This command is used to control auto aperture for volts, amps, ohms, and coulombs.
Usage
[:SENSe[1]]:VOLTage[:DC]:APERture:AUTO <b>|ONCE
[:SENSe[1]]:CURRent[:DC]:APERture:AUTO <b>|ONCE
[:SENSe[1]:RESistance:APERture:AUTO <b>|ONCE
[:SENSe[1]]:CHARge:APERture:AUTO <b>|ONCE
:AUTO?
<b>
 1 or ON: Enable auto aperture
 0 or OFF: Disable auto aperture
 ONCE: Enable and then disable auto aperture
Details
These commands are used to enable or disable auto aperture for the specified measurement
function. 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 Display resolution (on page 5-18) for 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 on the previous
page.
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.
Also see
:APERture <n> (on page 14-59)

Keithley 6517B Specifications

General

Brand	Keithley
Model	6517B
Category	Measuring Instruments
Language	English