Keithley 2461

Section
6: SCPI command reference Model 2461 Interactive SourceMeter® Instrument
Reference Manual
6-52 2461-901-01 A/November 2015
SENSe1 subsystem
The SENSe1 subsystem commands configure and control the measurement functions of the
instrument.
Many of these commands are set for a specific function (current, voltage, or resistance). For example,
you can program a range setting for each function. The settings are saved with that function.
[:SENSe[1]]:<function>:APERture
This command determines the aperture setting for the selected function.
Type Affected by Where saved Default value
Command and query
Recall settings
Instrument reset
Power cycle
Measure configuration list
Save settings
Measure configuration list
AUTO
Usage
[:SENSe[1]]:<function>:APERture <n>
[:SENSe[1]]:<function>:APERture DEFault
[:SENSe[1]]:<function>:APERture MINimum
[:SENSe[1]]:<function>:APERture MAXimum
[:SENSe[1]]:<function>:APERture?
[:SENSe[1]]:<function>:APERture? DEFault
[:SENSe[1]]:<function>:APERture? MINimum
[:SENSe[1]]:<function>:APERture? MAXimum
<function>
The digitize function:
• Digitize current: DIGitize:CURRent
•
Digitize voltage: DIGitize:VOLTage
<n>
1
µ
s to 1 ms set in 1
µ
s increments or AUTO (automatic)
Details
If you are using a digitize function, the aperture determines how long the instrument makes
measurements. The aperture is set to automatic or to a specific value in 1 µs intervals.
The aperture is the actual acquisition time of the instrument on the signal. It must be less than the set
sample rate. The minimum aperture is 1 µs when the maximum sampling rate is 1,000,000 samples
per second.
When the aperture is set to automatic, the aperture is equivalent to the sample rate interval.
If you specify an aperture and the value is less than 1 µs, it is rounded down to the nearest micro
second resolution.
If you set a value that is longer than the sample rate interval, the instrument generates an error event.
Set the sample rate before changing the aperture.
The maximum aperture available is 1 divided by the sample rate. The aperture cannot be set to more
than this value.
When automatic is selected, the aperture setting is set to the maximum value possible for the
selected sample rate. You select automatic by sending AUTO.