Source-Delay-Measure Cycle - Keithley SourceMeter 2400 User Manual

6-10 Source-Measure Concepts

Source-delay-measure cycle

In addition to static source and/or measure operation, SourceMeter operation can consist
of a series of source-delay-measure (SDM) cycles
the following occurs:
1. Set the source output level.
2. Wait for the source delay.
3. Make the measurement.
NOTE For the Model 2430 Pulse Mode, source delay is not used. The delays used for
Pulse Mode are covered in
See Section 11
Figure 6-1
Source-delay-measure (SDM) cycle
Source
Value
Trigger
Trigger
Latency
(100µs)
(1msec)
* If enabled
Figure 6-2 shows how the SDM cycle fits into the trigger model. (See
plete details on the trigger model.) When the source is turned on (triggered), an approxi-
mate 100µsec trigger latency occurs before the programmed source level is output. As long
as the source output stays on, trigger latency will not be included in subsequent SDM
cycles. Trigger latency only occurs when the output makes the transition from off to on.
(See the specifications in
trigger specifications.)
The delay phase of the SDM cycle allows the source to settle before the measurement is
performed. The delay period depends on how the source delay is configured. The source
delay can be manually set from 0000.00000 seconds to 9999.9990 seconds. If using auto
delay, the delay depends on which source range is presently selected, as summarized in
Table 3-4; see Section 3
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2400 Series SourceMeter
(Figure
Section 5.
for details on how the SDM cycle relates to the trigger model.
Start of A/D Conversion
Delay Measure
Auto*
Appendix A for definitions of trigger latency as well as other
for details.
®
User's Manual
6-1). During each SDM cycle,
End of A/D
Conversion
Section 11 for com-