Display Messages - Keithley 2651A Reference Manual

Section 3: Functions and features
Measurement functions
With a source-measure screen selected, the measured reading can be displayed as volts, amperes,
ohms, or watts. Configure the type of measured reading displayed by setting the
display.smua.measure.func attribute. The following programming example illustrates how to set
SMU A to display ohms measurements:
display.smua.measure.func = display.MEASURE_OHMS
Display resolution
Display resolution for measured readings can be set to 4-1/2, 5-1/2 or 6-1/2 digit resolution. Configure
the type of resolution displayed by setting the display.smua.digits attribute. The following
programming example illustrates how to set SMU A for 5-1/2 digit resolution for measured readings:
display.smua.digits = display.DIGITS_5_5
Display trigger wait and clear
The display.trigger.wait() function waits for the front panel TRIG key to be pressed, while the
display.trigger.clear() function clears the trigger event detector.

Display messages

Most of the display functions and attributes that are associated with display messaging will
automatically select the user screen. The attribute for the display screen is explained in
screen (on page 3-71).
The reset functions, reset() or smua.reset(), have no effect on the defined display message or
its configuration, but will set the display mode back to the previous source-measure display mode.
The display of the Model 2651A can be used to display user-defined messages. For example, while a
test is running, the following message can be displayed on the Model 2651A.
Test in Process
Do Not Disturb
The top line of the display can accommodate up to 20 characters (including spaces). The bottom line
can display up to 32 characters (including spaces) at a time.
The display.clear(), display.setcursor(), and display.settext() functions (which are
explained in the following paragraphs) are overlapped, nonblocking commands. The script will NOT
wait for one of these commands to complete.
These nonblocking functions do not immediately update the display. For performance considerations,
they write to a shadow and will update the display as soon as processing time becomes available.
3-72
Model 2651A High Power System SourceMeter® Instrument Reference Manual
NOTE
NOTE
Display
2651A-901-01 Rev. A / March 2011