Keithley SourceMeter 2400, User Manual

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5-6 Pulse Mode Operation (Model 2430 only) 2400 Series SourceMeter
®
User’s Manual
Pulse delay
The pulse delay (PD) is set by the user. It can be set from 0 to 9999.999sec.
Pulse duty cycle
Duty Cycle is the percentage of time during the pulse period that the output is on. It is cal-
culated as follows:
Duty Cycle = Pulse Width / (Pulse Width + Off-time)
For example, if the pulse width is 1msec and the off-time is 9msec, the duty cycle is calcu-
lated as follows:
Duty Cycle = 1msec / (1msec + 9msec)
= 1msec / 10msec
= 0.10
= 10%
Based on the possible output on/off times that can be configured, the pulse duty cycle can
range from <1% to 83.5%.
Fast pulse output
The fastest pulses are achieved by configuring the SourceMeter for the shortest pulse
width and shortest output off-time. This is accomplished by setting the measurement
speed to 0.004 PLC, setting the pulse delay to 0sec, and making sure that no other opera-
tions (i.e., relative, math calculations, store, sweep) are being performed.
The shortest pulse width for normal pulse measure-operation is 150µs (70µs for signal
measurement plus 80µs for overhead). The shortest output-off time is 3.04msec (140µsec
for reference and zero measurements plus 2.9msec for overhead).
Faster pulse speed can be accomplished by disabling auto zero (signal measurement only).
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