Model 2701 User’s Manual Triggering 8-5
Device action
The primary device action is a measurement. However, the device action block could
include the following additional actions (Figure 8-2):
Figure 8-2
Device action
• 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 the beginning of the Device
Action as shown in Figure 8-2. The hold count specifies how many readings have
to be within the window before it is accepted. See “Reading hold (autosettle),”
page 8-6, for operation details. After a Hold Reading is acquired, operation
proceeds to Channel Closure.
• Channel Closure — When 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).
Rdg Hold Chan
Filter
DEVICE ACTION
To Output Trigger
Block of Figure 8-1
From Delay Block
of Figure 8-1
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