Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-16 2601B-PULSE-901-01A April 2020
Additional guidelines for combining SMU outputs:
• When combining the outputs of two 2601B-PULSE instruments, restrict operation to pulse only or
limited duty cycle operations whenever possible. DC operation in Region 1 is possible
if necessary.
• For comparable rise times, the source range and level of SMU 1 must match the source range
and level of SMU 2.
• Do not place two voltage sources in parallel.
• Do not place two current sources in series.
• Think carefully about the appropriate output-off mode (smua.source.offmode) and output-off
function (smua.source.offfunc) whenever changes are made to the source function. The
alternative is to always use the high impedance output-off mode
(smua.source.offmode = smua.OUTPUT_HIGH_Z).
• Additional configuration guidelines are presented in the following topics. Additional information,
including examples on combining SMU instruments, is available in application notes on
tek.com/keithley.
Source current using two 2601B-PULSE instruments in parallel
Figure 45: Source current using parallel SMU instruments
The following values are based on the current and voltage levels available in Region 4, as shown in
the table in Combining SMU outputs (on page 4-14).
Set the pulser to disabled:
smua.pulser.enable = smua.DISABLE
Maximum pulsed signal levels for the 2601B-PULSE SMU:
20 A with 18 V compliance
SMU 1 configuration:
Output-off mode:
smua.source.offmode = smua.OUTPUT_NORMAL
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