Source Readback; Setting Source Readback - Keithley 2450 Reference Manual

Section 2: General operation

Source readback

You can set the instrument to record and display the voltage or current of the configured source value
or the actual source value. When you use the configured source value, the instrument records and
displays the value that was configured. When you use the actual source value, the instrument
measures the actual source value immediately before making the measurement of the device under
test.
Using source readback results in more accurate measurements, at the cost of a reduction in
measurement speed.
When source readback is on, the front-panel display shows the measured source value and the buffer
records the measured source value immediately before the device under test measurement. For
example, if you have the source set to 60 V, you will see something like +059.998 V in the
SOURCE VOLTAGE area of the Home screen.
When source readback is off, the front-panel display shows the configured source value and the
buffer records the configured source value immediately before the measurement of the device under
test. For example, if the source is set to 60 V, you will see something like +060.000 V in the
SOURCE VOLTAGE area of the Home screen.

Setting source readback

Using the front panel:
1. Press the MENU key.
2. Under Source, select Settings.
3. Next to Source Readback, select On or Off.
4. Select HOME to return to the operating display.
Using SCPI commands:
To set readback off for the current source, send the command:
:SOURce:CURRent:READ:BACK OFF
To set readback for the voltage source, replace CURRent with VOLTage. To turn readback off,
replace OFF with ON.
Using TSP commands:
To set readback off for the current source, send the commands:
smu.source.func = smu.FUNC_DC_CURRENT
smu.source.readback = smu.OFF
To set readback for the voltage source, replace smu.FUNC_DC_CURRENT with
smu.FUNC_DC_VOLTAGE. To turn readback on, replace smu.OFF with smu.ON.
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Model 2450 Interactive SourceMeter® Instrument Reference Manual
2450-901-01 Rev. B/September 2013