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Device action
The primary device action is a measurement. However, the device action block could include
the following additional actions (refer to
Figure 7-2
Device action
From Delay block
of Figure 7-1
•
Filtering — If the repeating filter is enabled, the instrument samples the specified
number of reading conversions to yield single filtered reading. Only one reading
conversion is performed if the filter is disabled, or after the specified number of reading
conversions for a moving average filter is reached. After a reading (Rdg) is procured,
operation proceeds to Hold.
•
Hold — The Hold feature is used to screen out reading anomalies. When enabled, the
user selects a window and count for Hold. In general, when a reading is outside the
window it is rejected; operation loops back to be beginning of the Device Action as
shown in
window before it is accepted. See
a Hold Reading is acquired, operation proceeds to Channel Closure.
•
Channel closure — When stepping or scanning, the last device action is channel
control. Using the hold feature provides an auto settling time for switching relays. Each
open/close transition will restart the hold process and a reading for each channel will not
occur until the relay settles.
Output trigger
After the device action, an output trigger occurs and is available at the rear panel Trigger Link
connector. This trigger can be used to trigger another instrument to perform an operation (e.g.,
select the next channel for an external scan).
Figure
Rdg
Hold
Filter
DEVICE ACTION
Figure
7-2. The hold count specifies how many readings have to be within the
"Reading hold
Triggering
7-2):
To Output Trigger
block of Figure 7-1
Chan
(autosettle)" for operation details. After
7-5
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