Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-18 2601B-PULSE-901-01A April 2020
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 2601B-PULSE:
40 V with 9 A compliance
SMU 1 configuration:
Output-off mode:
smua.source.offmode = smua.OUTPUT_NORMAL
Output-off function:
smua.source.offfunc = smua.OUTPUT_DCVOLTS
Normal output-off current limit:
smua.source.offlimiti = 1e-3 (default)
Current compliance must be 10% higher than the current compliance of SMU 2. Current compliance
limit (maximum):
smua.trigger.source.limiti = 10
The polarity of SMU 1 is generally the opposite of the desired voltage polarity across the device. To
achieve a positive voltage across the device, program SMU 1 to a negative voltage level. For
example, to output 40 V across the device, program SMU 1 to −20 V and SMU 2 to +20 V. To achieve
a negative voltage across the device, program SMU 1 to a positive voltage level and SMU 2 to a
negative voltage level.
Source polarity changes incur a 100 µs penalty. The number 0 is considered a positive value. For
negative-going pulses with a 0 V bias level, avoid the time penalty by programming a negative
number near zero, such as −1e−12 V.
SMU 2 configuration:
Output-off mode:
smua.source.offmode = smua.OUTPUT_NORMAL
Output-off function:
smua.source.offfunc = smua.OUTPUT_DCVOLTS
Normal output-off current limit (0.9 mA, which is 10% less than the SMU 1 output-off limit):
smua.source.offlimiti = 0.9e-3
Current compliance must be 10% lower than the current compliance of SMU 1. Therefore, this SMU
controls the maximum current through the DUT. Current compliance limit (maximum):
smua.trigger.source.limiti = 9
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