System SourceMeter® Instrument Reference Manual Section 2:
2600BS-901-01 Rev. B / May 2013 2-59
Combining SMU outputs
The following information provides cautions and important considerations that need to be observed
when combining SMU output channels.
Use care when combining SMU channels. Whenever SMU channels are combined, it is best to use
instruments with identical current and voltage envelopes/ranges.
Carefully consider and configure the appropriate output-off state, source, and compliance limits
before connecting the Series 2600B to a device that can deliver energy (for example, other voltage
sources, batteries, capacitors, solar cells, or other Series 2600B instruments. Configure
recommended instrument settings before making connections to the device. Failure to consider the
output-off state, source, and compliance limits may result in damage to the instrument or to the
device under test (DUT).
Configuration guidelines are presented in the following table. Additional information, including
examples on combining SMU channels, can be found in application notes on the
Keithley Instruments
website (http://www.keithley.com).
SourceMeter
instrument configuration
Guidelines
Source current using parallel SMUs
Maximum Pulsed Signal Levels for Series 2600B:
Model 2601B/2602B/2604B:
20 A with 18 V limit
Model 2611B/2612B/2614B/2634B/2635B/2636B:
20 A with 4.5 V limit
SMU 1 configuration:
Output-off mode:
smuX.source.offmode = smuX.OUTPUT_NORMAL
Output-off function:
smuX.source.offfunc = smuX.OUTPUT_DCVOLTS
Current limit for normal output-off mode (this is the maximum current
that will flow between the two SMUs when the output is off):
smuX.source.offlimiti = 1e-3 (default)
Voltage compliance must be 10% lower than the voltage compliance
of SMU 2. Therefore this SMU will control the maximum voltage
across the DUT. Voltage compliance limit (maximum):
Model 2601B/2602B/2604B:
smuX.trigger.source.limitv = 18
Model 2611B/2612B/2614B/2634B/2635B/2636B:
smuX.trigger.source.limitv = 4.5
SMU 2 configuration:
Output-off mode:
smuX.source.offmode = smuX.OUTPUT_NORMAL
Output-off function:
smuX.source.offfunc = smuX.OUTPUT_DCAMPS
Normal output-off voltage limit:
smuX.source.offlimitv = 20 (default)
Voltage compliance must be 10% higher than the voltage compliance
of SMU 1. Voltage compliance limit (maximum):
Model 2601B/2602B/2604B:
smuX.trigger.source.limitv = 20
Model 2611B/2612B/2614B/2634B/2635B/2636B:
X
.trigger.source.limitv = 5
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