Keithley 2450 Application Note

View the measurements on the front-panel graph
To view the leakage current measurements on the front-panel graph:
1. Press the MENU key.
2. Under Views, select Graph.
3. Select the Scale tab.
4. Under Y-Axis, next to Scale Format, select Log.
5. Under X-Axis, next to Auto Scale, select On.
6. Select the Graph tab to view the graph.
Figure 5 shows the front-panel graph for this application.
Set up the leakage current application using SCPI commands
The following SCPI code performs a capacitor leakage measurement by sourcing 20V and measuring the resulting leakage current.
The Duration Loop trigger model template applies the voltage for 60 seconds and makes measurements at 200ms intervals. After the
duration time, the capacitor is discharged at 0V and the output is turned off.
Send the following commands for this example application:
Command Description
*RST
:SOUR:FUNC VOLT
:SOUR:VOLT 20
:SOUR:VOLT:ILIMIT 0.01
:SENSE:FUNC “CURR”
:ROUT:TERM REAR
:CURR:RANG:AUTO ON
:SENSE:CURR:NPLC 1
:TRIG:LOAD:LOOP:DUR 60, 0.2
:OUTP ON
:INIT
*WAI
:TRAC:ACT? “defbuffer1”
:TRAC:DATA? 1, <n>, “defbuffer1”, READ, REL
:SOUR:VOLT 0
:OUTP OFF
Reset the Model 2450.
Set to source voltage.
Set the source voltage to 20 V.
Set the current limit to 10 mA.
Set the instrument to measure current.
Set to use rear-panel terminals.
Set the current range to autorange.
Set the number of power line cycles to 1.
Load the Duration Loop trigger model to run for 60 s at 200 ms intervals.
Turn on the output.
Trigger the measurement.
Wait for the measurement to finish.
<n> is the queried number of readings.
Query the number of readings in defbuffer1 and return the readings and time.
Discharge the capacitor to 0 V.
Turn off the output.
Set up the leakage current application
using TSP commands
NOTE: The following TSP code is designed to be run from
Keithley Instruments Test Script Builder (TSB). TSB is
a software tool included on one of the CD-ROMs that
came with your Model 2450. You can install and use
TSB to write code and develop scripts for TSP-enabled
instruments. Information about how to use TSB is in
the online help for TSB and in the “Introduction to TSP
operation” section of the Model 2450 Reference Manual.
To use other programming environments, you may need
to make changes to the example TSP code.
By default, the Model 2450 is configured to use the SCPI
command set. You must select the TSP command set before
sending TSP commands to the instrument.
To enable TSP commands:
1. Press the MENU key.
2. Under System, select Settings.
3. Select the button next to Command Set and select TSP.
4. You are prompted to reboot. Select Yes.
The following TSP code performs a capacitor leakage
measurement by sourcing 20V and measuring the resulting
leakage current. The Duration Loop trigger model template
applies the voltage for 60 seconds and makes measurements
at 200ms intervals. After the duration time, the capacitor is
discharged at 0V and the output is turned off.
After the code is executed, the measurement results are
displayed in the Instrument Console of Test Script Builder.
From the Instrument Console, you can copy the data into a
spreadsheet for graphing.
Send the following commands for this example application:

Keithley 2450 Specifications

General

Brand	Keithley
Model	2450
Category	Test Equipment
Language	English