Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-20 2601B-PULSE-901-01A April 2020
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:
smua.source.offlimiti = 1e-3
The current compliance of SMU 2 (the voltage source) must be 10% greater than the maximum
programmed current of SMU 1 (the current source).
Current compliance limit (maximum):
smua.trigger.source.limiti = 10
Guarding and shielding
You can optimize source-measure performance and safety with the effective use of guarding and
shielding (noise and safety shields).
Safety shield
You can implement a safety shield to protect the operator from hazards that arise when testing
devices under test (DUTs).
Guarding
A driven guard is always enabled and provides a buffered voltage that is at the same level as the
input/output HI voltage. The purpose of guarding is to eliminate the effects of leakage current (and
capacitance) that can exist between HI and LO. Without guarding, leakage and capacitance in the
external high-impedance test circuit could be high enough to adversely affect the performance of the
2601B-PULSE.
Guarding (shown below) should be used when test circuit impedance is >1 GΩ.
See Guard (on page 7-24) for details on the principles of guarding.
The guard shield can be the shield of a coaxial cable. It can also be an insulated foil that surrounds
the conductor. Refer to FORCE and SENSE connectors (on page 4-8) for detail on the
coaxial connections.
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