Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 4: Sourcing and measuring
2601B-PULSE-901-01A April 2020 4-5
To determine if a pulser level protection was tripped, send:
print(smua.pulser.protect.tripped)
A returned value of true indicates that the protection circuit was tripped. The following events can
trip the protection circuit:
• A voltage greater than smua.pulser.protect.sensev was detected on the sense terminals.
• A voltage greater than smua.pulser.protect.sourcev was detected on the force terminals.
• The maximum pulse width was exceeded during trigger model operation.
• The maximum duty cycle was exceeded during trigger model operation.
• If the SMU cannot keep up with the pulse rate.
• If the SMU cannot keep up with the measurement rate.
The status is reset to false when the pulser is disabled or when the output is turned on.
Pulser measurement considerations
If the output exceeds a maximum pulse width, maximum duty cycle, or the specified protection level
during a sweep, the 2601B-PULSE output is shorted, but the sweep continues with no source output
until it is finished.
Sink operation
Carefully consider and configure the appropriate output-off state, source function, and
compliance limits before connecting the 2601B-PULSE to a device that can deliver energy (for
example, other voltage sources, batteries, capacitors, solar cells, or other 2601B-PULSE
instruments). Configure recommended instrument settings before making connections to the
device. Failure to consider the output-off state, source, and compliance limits may result in
damage to the instrument or to the device under test (DUT).
When operating as a sink (V and I have opposite polarity), the instrument is dissipating power rather
than sourcing it. An external source (for example, a battery) or an energy storage device (for example,
a capacitor) can force operation into the sink region.
When the pulser is disabled, the accuracy of the limit opposite in polarity from the source is
diminished unless the instrument is in sink mode. Enabling sink mode reduces the source limit
inaccuracy seen when operating in quadrants II and IV. Quadrants I and III will show this source limit
inaccuracy. Also see Limit principles (on page 7-2).
For example, if a 12 V battery is connected to the voltage source (HI to battery +) that is programmed
for +10 V, sink operation occurs in the second quadrant (source +V and measure -I).
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