Keithley Interactive SourceMeter 2450 User Manual

Model 2450
Interactive SourceMeter® Instrument User's Manual Section 7: Measuring I-
V characteristics of FETs
2450-900-01 Rev. C / December 2013 7-7
SMU 2
*RST
SENS:FUNC "CURR"
SENS:CURR:RANG:AUTO ON
ROUT:TERM REAR
SOUR:FUNC VOLT
SOUR:VOLT:RANG 20
SOUR:VOLT:ILIM 1
SOUR:CONF:LIST:CRE "sweepVals"
DIG:LINE2:MODE TRIG, OUT
DIG:LINE1:MODE TRIG, IN
TRIG:DIG2:OUT:STIM NOT2
TRIG:DIG1:IN:CLE
TRIG:DIG1:IN:EDGE RIS
• Reset the instrument.
• Set to measure current.
• Set to measure with autorange enabled.
• Set to rear terminals.
• Set to source voltage.
• Set to 20 V source range.
• Set the source limit to 1 A.
• Create the source configuration list
sweepVals.
• Set digital line 2 to trigger out.
• Set digital line 1 to trigger in.
• Set the stimulus for digital line 2 to the
notify2 event.
• Clear digital line 1.
• Detect for a rising edge on line 1.
Pseudocode
for i = 0, 5, 0.1 do:
• Set up a for loop from 0 to 5 in 0.1 steps
(inclusive).
SMU 2
SOUR:VOLT i
SOUR:CONF:LIST:STORE "sweepVals"
• Set the voltage level to the iteration
number.
• Store the source configuration to
sweepVals.
Pseudocode
end for
• End the
for
loop.
SMU 2
TRIG:BLOC:CONF:RECALL 1,
"sweepVals"
TRIG:BLOC:SOUR:STAT 2, ON
TRIG:BLOC:WAIT 3, DIG1
TRIG:BLOC:DEL:CONS 4, 0.01
TRIG:BLOC:MEAS 5
TRIG:BLOC:CONF:NEXT 6, "sweepVals"
TRIG:BLOC:BRAN:COUN 7, 51, 4
TRIG:BLOC:NOT 8, 2
TRIG:BLOC:BRAN:COUN 9, 4, 3
TRIG:BLOC:SOUR:STAT 10, OFF
• Create a block to load sweepVals at the
first index.
• Create a block to turn the output on.
• Create a block to wait on digital line 3.
• Create a block to delay for 0.01 seconds.
• Create a block to take a measurement.
• Create a block to load the next index of
sweepVals.
• Create a block to branch to block 4, 50
times.
• Create a block to generate the notify2
event.
• Create a block to branch to block 3 three
times.
• Create a block to turn the output off.
SMU 1
INIT
• Initiate the trigger model.
SMU 2
INIT
• Initiate the trigger model.
Pseudocode
vds = []
ids = []
for i = 2, 5 do:
• Create an empty array to hold measured
voltage values.
• Create an empty array to hold measured
current values.
•
Set up a for loop from 2 to 5 (Including 5).
SMU 2
vds[i-1] = TRAC:DATA? 1 + 51*(i-
2), 51*(i-1), "defbuffer1", SOUR
vds[i-1] = TRAC:DATA? 1 + 51*(i-
2), 51*(i-1), "defbuffer1", READ
• Save the sourced and measured values to
the arrays vds and ids, respectively. The
readings from each step are saved at each
index in the array.
Pseudocode
end for
• End the
for
loop.

Keithley Interactive SourceMeter 2450 Specifications

General

Model	2450
Type	SourceMeter
Category	Measuring Instruments
Maximum Voltage	200 V
Maximum Current	1 A
Maximum Power	20 W
Display	5-inch capacitive touchscreen
Touchscreen Display	Yes
Connectivity	USB, LAN, GPIB
Measurement Resolution	6.5 digits
Interface	USB, GPIB
Functions	Sourcing and measuring voltage and current

Summary

Safety Precautions

Responsible Body

Operators

Electrical Safety

Details electrical safety requirements, including voltage hazards and protective measures.

Handling Power and Connections

Provides instructions for safe handling of power cords, cables, and connections.

Symbol Meanings

Explains the meaning of various safety symbols used on the instrument.

Maintenance Precautions

Safety advice regarding maintenance, component replacement, and cleaning.

Using the Front-Panel Interface

Front Panel Overview

Provides a visual and textual description of the Model 2450's front panel controls.

Touchscreen Navigation

Powering the Instrument On or Off

Provides step-by-step instructions for connecting power and turning the instrument on/off.

Turning the Model 2450 Output On or Off

Explains how to control the instrument's output from the front panel or remotely.

Store Measurements on a USB Flash Drive

Provides steps to copy measurement data to a USB flash drive in CSV format.

Saving Screen Captures to USB Flash Drive

Using a Remote Interface

Remote Communication Interfaces

Discusses selecting communication interfaces for sending commands and receiving responses.

GPIB Communications

Install GPIB Driver Software

Set the GPIB Address

Provides steps to set the GPIB address from the front panel.

LAN Communications

Explains communicating with the instrument over a local area network.

Set up LAN Communications on the Instrument

Details setting up manual or automatic LAN communications on the instrument.

Set up Manual LAN Configuration

USB Communications

Connecting a Computer to the Model 2450 using USB

Using the Web Interface

Connecting to the Instrument Web Interface

LAN Troubleshooting Suggestions

Provides common troubleshooting steps for LAN connectivity issues.

Determine the Command Set

Making Basic Front-Panel Measurements

How to Make Front-Panel Measurements

Step-by-step guide to performing a basic measurement from the front panel.

Measuring Low-Resistance Devices

To Use the 4-Wire Connection Method

Low-Resistance Measurements

Set up the Measurement from the Front Panel

Step-by-step instructions to configure the instrument for low-resistance measurement.

Set up the Low-Resistance Application using SCPI Commands

Provides SCPI commands to perform 100 low-resistance measurements.

Set up the Low-Resistance Application using TSP Commands

Provides TSP code to perform 100 low-resistance measurements.

Leakage Current and Insulation Resistance

Measuring Leakage Current

Demonstrates measuring leakage current of a 1 nF capacitor over time.

Set up the Leakage Current Application using the Front Panel

Step-by-step guide to set up leakage current measurement from the front panel.

Set up the Leakage Current Application using SCPI Commands

Provides SCPI commands for capacitor leakage measurement.

Set up the Leakage Current Application using TSP Commands

Provides TSP code for capacitor leakage measurement.

Measuring Insulation Resistance

Introduces measuring insulator resistance using the Model 2450.

Set up the Insulation Resistance Application using the Front Panel

Step-by-step guide to set up insulation resistance measurement from the front panel.

Set up the Application using SCPI Commands

Provides SCPI commands for insulation resistance measurement.

Set up the Application using TSP Commands

Provides TSP code for insulation resistance measurement.

Measuring I-V Characteristics of FETs

Set up the Application using SCPI Commands with the Trigger Model

Provides SCPI commands for FET testing using a trigger model.

Set up the Application using SCPI Commands in a Linear Sweep

Provides SCPI commands for FET testing using a linear sweep.

Set up the Application using TSP Commands with the Trigger Model

Provides TSP commands for FET testing using a trigger model.

Set up the Application using TSP Commands in a Linear Sweep

Provides TSP commands for FET testing using a linear sweep.

Rechargeable Battery Measurements

Automated Battery Charge and Discharge Cycle Testing

Explains automating battery charge/discharge tests using SCPI or TSP commands.

Set up the Battery Application using SCPI Commands

Provides SCPI commands for battery application testing.

Set up the Battery Application using TSP Commands

Provides TSP code for battery application testing.

TSP Commands for Battery Testing

Measuring I-V Characteristics of Solar Cells

Device Connections

Solar Cell Characterization

Outlines steps for characterizing a solar cell using the Model 2450.

Set up the Solar Cell I-V Sweep from the Front Panel

Step-by-step guide to set up solar cell I-V sweep from the front panel.

Set up the Solar Cell I-V Sweep using SCPI Commands

Provides SCPI commands for solar cell I-V sweep.

Set up the Solar Cell I-V Sweep using TSP Commands

Provides TSP commands for solar cell I-V sweep.

TSP Commands for Solar Cell Characterization

Troubleshooting FAQs

How Do I Upgrade the Firmware?

How Do I Change the Command Set?

Change Command Set Remotely

Why Am I Getting a 5074 Event Code?

How Do I Save the Present State of the Instrument?

What Are the Quick Setup Options?