6-10 Source-Measure Concepts 2400 Series SourceMeter
®
User’s Manual
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 (Figure 6-1). During each SDM cycle,
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 Section 5.
See Section 11 for details on how the SDM cycle relates to the trigger model.
Figure 6-1
Source-delay-measure (SDM) cycle
Figure 6-2 shows how the SDM cycle fits into the trigger model. (See Section 11 for com-
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 Appendix A for definitions of trigger latency as well as other
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 for details.
Auto*
(1msec)
Measure
End of A/D
Conversion
Source
Value
Trigger
Latency
(100µs)
Trigger
Delay
Start of A/D Conversion
* If enabled
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