B-8 Return to Section Topics 2600S-900-01 Rev. C / January 2008
Appendix B: Frequently Asked Questions Series 2600 System SourceMeter
®
Instruments User’s Manual
How do I parallel channels to output higher current?
Reference See Section 3 of the Series 2600 Reference Manual for details on SMU connections.
The maximum DC output current of a Model 2601 or Model 2602 channel is as follows:
• 1.01A @ up to 40.4V
• 3.03A @ up to 6.06V
The maximum DC output current of a Model 2611/2612 or Model 2635/2636 channel is as follows:
• 101mA @ up to 202V
• 1.515A @ up to 20.2V
Higher current can be output by connecting channels in parallel. Figure B-4 shows four channels
of two Model 2602s, 2612s, or 2636s connected in parallel. Two Model 2602s can output up to
4.04A at up to 40.4V and 12.12A at up to 6.06V, while two Model 2612s and Model 2636s can
output up to 404mA at up to 202V and 6.06A at up to 20.2V. The current delivered to the DUT is
the sum of currents output by the four SMU channels. More current can be output by connecting
additional channels in parallel.
Figure B-4
Connecting channels in parallel for higher current
Chan B
Chan A
2602-1,
2612-1,
or
2636-1
+
+
Chan B
Chan A
2602-2,
2612-2,
or
2636-2
+
+
DUT
I1 I2
I3
I4
IT = I1 + I2 + I3 +14
How do I make contact check measurements?
Reference See “Contact check measurements” in Section 4 and command information in
Section 12 of the Series 2600 Reference Manual for contact check details.
Contact check connections
The contact check function
1
prevents measurement errors due to excessive resistance in the force
or sense leads caused by poor contact at the DUT, failing relay contacts on a switching card, or
wires that are too long or thin. The contact check function will also detect an open circuit that may
occur with a four-point probe is misplaced or misaligned.
Figure B-5 shows Model 2601/2602/
2611/2612 contact check connections, and Figure B-6 shows Model 2635/2636 contact check
connections. R
C
is the resistance of the mechanical contact at the DUT, and R
S
is the series
resistance of relays and cables.
1. All Model 2611/2612s manufactured by Keithley Instruments support the contact check function. Only Model 2601/2602s with
firmware revision 1.1.0 or later and SMU hardware revision E or later support the contact check function. To determine the firmware
and SMU hardware revisions, inspect the data returned by the print(localnode.info()) command. The InstFwRev and
SMUBrdRev keys contain the necessary information (contact check is NOT on 2635/2636).
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