Keithley Series 2600 User Manual

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4-8

SECTION 4

FET Tests

WARNING

When a System SourceMeter instrument is pro-

grammed for remote sensing, hazardous voltage

may be present on the SENSE and OUTPUT termi-

nals when the unit is in operate regardless of the

programmed voltage or current. To avoid a pos-

sible shock hazard, always turn off power before

connecting or disconnecting cables to the Source-

Measure Unit or the associated test ﬁxture.

NOTE

Entered values for both V

and I

are adjusted to the

reverse polarity because of the connection conﬁgura-

tion used. For example, for an N-channel FET, both V

and I

must be negative.

As an example, entering a V

of 5V will result in –5V

actually being applied at the output.

These values will result in proper biasing of the

DUT. Also, the sign of the measured V

value will be

reversed.

4.5.6 Example Program 11B: Self-bias

Threshold Voltage Tests

Use Program 11B to perform the self-bias threshold voltage test.

With the power off, connect a dual-channel System Source-1.

Meter instrument to the computer’s IEEE-488 interface.

Connect the test ﬁxture to both units using appropriate cables. 2.

Note that OUTPUT HI of SMUA is connected to the OUTPUT

LO of SMUB, while SENSE HI of SMUA is connected to the

OUTPUT HI of SMUB.

Turn on the instrument and allow the unit to warm up for two 3.

hours for rated accuracy.

Turn on the computer and start Test Script Builder (TSB). Once 4.

the program has started, open a session by connecting to the

instrument. For details on how to use TSB, see the

Series 2600

Reference Manual.

You can simply copy and paste the code from Appendix A in 5.

this guide into the TSB script editing window (Program 11B),

manually enter the code from the appendix, or import the TSP

ﬁle ‘FET_Thres_Fast.tsp’ after downloading it to your PC.

If your computer is currently connected to the Internet, you

can click on this link to begin downloading from http://www.

keithley.com/data?asset=50920.

Install an NPN FET such as a SD210 in the appropriate tran-6.

sistor socket of the test ﬁxture.

Now, we must send the code to the instrument. The simplest 7.

method is to right-click in the open script window of TSB,

and select ‘Run as TSP ﬁle’. This will compile the code and

place it in the volatile run-time memory of the instrument.

To store the program in non-volatile memory, see the “TSP

Programming Fundamentals” section of the Series 2600 Refer-

ence Manual.

Series 2600

System

SourceMeter

Channel A

Sources V

Series 2600

System

SourceMeter

Channel B

Sources I

(= I

)

Measures V

Test

Fixture

FET

Under Test

Output HI

Output LOSense LO

Sense HI

Output LO

Output HI

Figure 4-7. Conﬁguration for self-bias threshold tests

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Keithley Series 2600 Specifications

General

Model	Series 2600
Measurement Functions	Voltage, Current, Resistance, Power
Resolution	Up to 6.5 digits
Current Source Range	Up to 10A
Communication Interfaces	GPIB, USB
Applications	Semiconductor testing
Category	Source Measure Unit (SMU)
Channels	Single or Dual Channel (varies by model)