Section 7: Theory of operation Model 2601B-PULSE System SourceMeter Instrument Reference Manual
7-4 2601B-PULSE-901-01A April 2020
Duty cycle with the pulser enabled
When the pulser is enabled, the instrument limits the duty cycle using the formula shown below. If a
trigger model attempts to exceed this duty cycle, the output is turned off and an error is generated. To
avoid this, use the following formula to calculate the maximum allowed duty cycle for your pulser
operating conditions.
Figure 98: Pulser enabled duty cycle for a current bias less than or equal to 10 mA
Pulser power limit and maximum power duty cycle equations
When the pulser is enabled and the instrument is operating at an elevated temperature or in sinking
conditions, the duty cycle may be limited further than the values given above. You can use the
following equation to calculate the maximum duty cycle.
The extended maximum duty cycle equation is:
In both equations, P
D
is 1.5 W per °C above 28 °C when the instrument is operating in environments
above 28 °C. DC is the duty cycle.
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