To set the limit, send the command with the limit value as the parameter. The following programming
example illustrates how to set the current, voltage, and power limit to 50 mA, 4 V, and 1 W
respectively:
smua.source.limiti = 50e-3
smua.source.limitv = 4
smua.source.limitp = 1
The following programming example illustrates how to print the limit state:
print(smua.source.compliance)
A returned value of true indicates one of the following things:
• If the instrument is configured as a current source, the voltage limit has been reached
• If the instrument is configured as a voltage source, the current limit has been reached
Pulser protection circuit
The pulser has two protection circuits, one for the sense terminals and one for the force terminals.
Both are set using remote commands. When either of the protection circuits are exceeded, the
instrument generates the 5127 "Output protection level exceeded" error and the current pulse
terminates within 3 µs.
The sense terminals are monitored by the voltage protection circuit. If the voltage on the sense
terminals goes above the protection level, the output is turned off. If the level was exceeded during a
sweep, the output is shorted until all trigger counts are satisfied, then the output is turned off. The
voltage protection level can be set from 5 percent to 200 percent of the pulser voltage range.
The force terminals are monitored by the absolute voltage protection circuit. If the voltage on the force
terminals goes above the protection level, the 2601B-PULSE automatically turns off the output. The
absolute voltage level can be set from 2 V to 40 V, independent of the range. This level ignores
normal transients during pulse rise and fall times.
For information on the commands for the pulser protection circuit, refer to the following command
descriptions in the Model 2601B-PULSE Reference Manual:
• smua.pulser.protect.sensev
• smua.pulser.protect.sourcev
Setting a protection level does not guarantee that the output will not go above the protection
level. The 2601B-PULSE turns off the output as quickly as possible, but the voltage level can
briefly exceed this level, potentially causing damage to the device under test (DUT).
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