Models 2500 and 2502 User’s Manual Triggering 10-21
Trigger delay
A programmable delay is available before the Source Action. The Trigger Delay can be
manually set from 0.00000 to 999.99990 seconds. Note that this delay is separate from the
Delay Action of the SDM cycle. The Delay Action is discussed next.
Source, delay, and measure actions
The SDM cycle of the Model 2500 consists of three actions: Source, Delay, and Measure:
SOURCE action — Any programmed output voltage level changes are performed.
DELAY action — This programmable delay is used to allow the source to settle before a
measurement is performed. It can be manually set from 0.00000 to 9999.99800 seconds,
or Auto Delay can be enabled. With Auto Delay enabled, the Model 2500 automatically
selects a nominal delay period based on the selected current range.
MEASURE action — During this phase of the SDM cycle, the measurement process
takes place. If the repeat filter is enabled, as shown in Figure 10-10, the instrument sam-
ples the specified number of reading conversions to yield a single filtered reading (mea-
surement). If using the moving filter or if the filter is disabled, only a single reading
conversion will yield a reading.
Figure 10-10
Measure action
CONV
CONV
CONV
CONV = Reading Conversion
MEASURE
Action
Filter Process
Autorange
CALC
(Repeat)
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