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SeCTIon 4
FET Tests
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.
Entered values for both V
reverse polarity because of the connection configura-
tion used . For example, for an N-channel FET, both V
and I
must be negative .
D
As an example, entering a V
actually being applied at the output .
These values will result in proper biasing of the
DUT . Also, the sign of the measured V
reversed .
4.5.6 example Program 11B: Self-bias
Threshold Voltage Tests
Use Program 11B to perform the self-bias threshold voltage test .
1 .
With the power off, connect a dual-channel System Source-
Meter instrument to the computer's IEEE-488 interface .
Figure 4-7. Configuration for self-bias threshold tests
4-8
WARNING
NOTE
and I
are adjusted to the
DS
D
of 5V will result in –5V
DS
value will be
T
FET
Under Test
G
Output HI
Series 2600
I
System
SourceMeter
Channel B
V
Sources I
(= I
)
D
S
Measures V
T
Output LO
2 .
Connect the test fixture to both units using appropriate cables .
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 .
3 .
Turn on the instrument and allow the unit to warm up for two
hours for rated accuracy .
4 .
Turn on the computer and start Test Script Builder (TSB) . Once
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 .
5 .
You can simply copy and paste the code from Appendix A in
this guide into the TSB script editing window
DS
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
keithley.com/data?asset=50920.
6 .
Install an NPN FET such as a SD210 in the appropriate tran-
sistor socket of the test fixture .
7 .
Now, we must send the code to the instrument . The simplest
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 .
D
Sense LO
Test
Fixture
S
Sense HI
Output LO
Series 2600
System
SourceMeter
V
Channel A
Sources V
DS
Output HI
(Program
11B),
http://www.
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