Guidelines for combining SMU outputs
When combining the outputs of two 2600B SMUs, restrict operation to pulse only or limited duty cycle
operations whenever possible. DC operation in Region 1 is possible if necessary.
Do not place two voltage sources in parallel.
Do not place two current sources in series.
Carefully consider the appropriate output-off mode (smua.source.offmode) and output-off function
(smua.source.offfunc) whenever changes are made to the source function. An alternative is to
always use the high impedance output-off mode
(smua.source.offmode = smua.OUTPUT_HIGH_Z).
To obtain the cleanest pulse edges and sweep steps, the rise and fall times of the individual SMUs
must be similar. For comparable rise and fall times, the source range, source level, and limit range of
SMU 1 should match the source range, source level, and limit range of SMU 2. Because you cannot
set the source limit range directly, you must choose limit values that cause both SMUs to operate on
the same limit range.
Additional configuration guidelines are presented in the following topics. Additional information,
including examples of combining SMU instruments, is available in application notes on
tek.com/keithley.
Source current using two 2600B instruments in parallel
This example shows the recommended approach for setting the source and limit ranges and levels
when combining SMU current sources in parallel.
Figure 16: Source current using parallel SMU instruments
The values are based on the current and voltage levels available in Region 4 of a 2601B, 2602B, or
2604B SMU, as shown in the table in Combining SMU outputs (on page 2-27). For information about
generating pulses with a 2600B, refer to Using timers to perform pulse mode sweeps (on page 4-16).
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