2-8
IM 765501-01E
Pulse Source Mode
Pulse source mode can be used to improve the reproducibility of measurements on
DUTs that change in characteristics due to the heat generation that results from applying
the source such as a resistor with large temperature coefficient. It is also effective for
evaluation of display devices that use pulse width to control the brightness.
The pulse is specified by two values, the pulse base value and the source level. The
minimum pulse width is 100
µ
s.
As with the DC source, the source level changes after a time specified by the source
delay elapses from the point in which the trigger is activated. Furthermore, the
measurement starts after a time specified by the measurement delay elapses. The
source level changes at the same the measure delay is activated and returns to the
pulse base value after the pulse width. A source measure cycle is finished at the end of
the pulse or at the end of the measurement and computation, whichever comes later.
If the measurement function (see section 2.4, “Measurement”) is turned OFF, measure
delay, measurement, and computation are not carried out. The end of the pulse is the
end of a source measure cycle.
When the End of the Measurement and Computation Is after the End of the Pulse
Generation
Measurement
Computation
Trigger
Source
Measurement
Current source level
Base pulse value
Source delay
Measurement
delay
Source measure cycle
Pulse width
Base pulse value
Pulse source end
When the End of the Measurement and Computation Is before the End of the Pulse
Generation
Measurement
Computation
Trigger
Source
Measurement
Current source level
Base pulse value
Base pulse value
Source delay
Measurement
delay
Source measure cycle
Pulse width
Pulse source end
Source Delay
(See section 5.6 for the procedure)
The source delay specifies the wait time at which the source value is actually changed
after the trigger is activated. It is typically used as a trigger delay when an external
trigger is used.
The source delay can be set in the range of 1
µ
s to 3600 s. However, setting a long
source delay results in a long source measure cycle. Set the smallest value possible.
2.3 Source
