Keithley 2461 Reference Manual

Section
8: TSP command reference Model 2461 Interactive SourceMeter® Instrument Reference Manu
al
8-106 2461-901-01 A/November 2015
smu.digitize.aperture
This attribute determines the aperture setting for the selected function.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Configuration script
Measure configuration list
smu.APERTURE_AUTO
Usage
time = smu.digitize.aperture
smu.digitize.aperture = time
time
The time of the aperture in seconds or automatic:
• Range: 1 µs to 1 ms; set in 1 µs increments
•
Automatic: 0 or smu.APERTURE_AUTO
Details
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.
Example
smu.digitize.func = smu.FUNC_DIGITIZE_CURRENT
smu.digitize.samplerate = 1000000
smu.digitize.aperture = smu.APERTURE_AUTO
smu.digitize.count = 1
print(smu.digitize.read())
Set the digitize function to measure current.
Set the sample rate to 1,000,000, with a
count of 1, and automatic aperture.
Make a digitize measurement.
Also see
Digitize functions (on page 2-113)
smu.digitize.func (on page 8-108)
smu.digitize.samplerate (on page 8-128)

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV