Section 2: General operation Model 2651A High Power System SourceMeter® Instrument Reference Manual
2-52 2651A-901-01 Rev. A / March 2011
Higher pulse voltage can be output by connecting two (and only two) Model 2651A instrument's
channels in series. When combining two SMU channels, make sure both SMUs have the same model
number.
The following figure illustrates two Model 2651As configured with the two channels connected in
series to output up to 80 V (40 V per channel).
Whenever hazardous voltage (>30 V RMS, 42 V peak) will be output, a safety shield must completely
surround the DUT test circuit. When using a metal safety shield, it must be connected to a known
safety earth ground and chassis ground.
Figure 17: Connecting channels in series for higher voltage
2651A
(2nd)
2651A
(1st)
Chassis earth
ground
Safety earth ground
Safety shield
LO
HI
HI
LO
-
+
+
-
Connect
OUTPUT LO
to chassis
DUT
2
3
1
(1) First Model 2651A: SMU maximum pulse voltage: -40 V
(2) Second Model 2651A: SMU maximum pulse voltage: +40 V
(3) Series SMU maximum pulse voltage (as shown): 80 V
For further information, visit the Keithley Instruments website
(http://www.keithley.com) for application
notes on combining SMU channels.
Combining channels in parallel to output higher current
Higher pulse current can be output by connecting two (and only two) Model 2651A instrument's
channels in parallel. When combining two SMU channels, make sure both SMUs have the same
model number.
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