Display Commands; Making Resistance Measurements - Keithley 2461 Reference Manual

Appendix D: Convert Model 2400 to Model 2461 code
In the Model 2461, the READ? command does not initiate a trigger when it makes a measurement. It
also makes only one measurement at a time. The data is automatically stored in a buffer
(defbuffer1 if the buffer is not specified in the command).
In the Model 2461, use the TRACe:DATA? command to read the information from the buffer and take
a specified amount of data instead of all data. You can also define which data to return, such as the
date, time, and units of measure.
The :INITiate command is used to start the trigger model. To trigger measurements when you are
not using the trigger model, use :TRACe:TRIGger.
The command for the number of readings is also different. In the Model 2461, use the Simple Loop
Trigger Template command TRIG:LOAD "SimpleLoop".
An example of a data acquisition done for the Model 2400 compared with one done for the Model
2461 is shown in the following table. In these examples, the SourceMeter
programmed to output 5 V and take 10 current readings with autorange ON. The instruments return
the source value, current measurements, and relative timestamps.
Model 2400
*RST
SOUR:FUNC VOLT
SOUR:DEL 0.1
SOUR:VOLT 5
SENS:FUNC "CURR"
SENS:CURR:RANG:AUTO ON
SENS:CURR:PROT 0.01
:FORM:ELEM VOLT, CURR, TIME
:TRIG:COUNT 10
:SYST:TIME:RES:AUTO ON
:OUTP ON
READ?
OUTP OFF

Display commands

The display commands have changed in the Model 2461 to accommodate the change to the
touchscreen display. For information, see

Making resistance measurements

The method for selecting manual or auto ohms and for making resistance measurements is different
in the Model 2461 than it is in the Series 2400. For information about resistance measurements, see
Making resistance measurements
D-2
Model 2461 Interactive SourceMeter® Instrument Reference Manual
Model 2461
*RST
SOUR:FUNC VOLT
SOUR:VOLT 5
SOUR:VOLT:ILIM 0.01
SENS:FUNC "CURR"
SENS:CURR:RANG:AUTO ON
TRIG:LOAD "SimpleLoop", 10, 0.1
OUTP ON
INIT
*WAI
TRAC:DATA? 1, 10, "defbuffer1", SOUR, READ, REL
OUTP OFF
Display features
(on page 2-105).
®
instruments are
(on page 2-45).
2461-901-01 A/November 2015