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Model 2790 SourceMeter
Device action
The primary device action is a measurement. However, the device action block could
include the following additional actions
Figure 8-2
Device action
From Delay Block
of Figure 8-1
•
•
•
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 oper-
ation (e.g., select the next channel for an external scan).
®
Switch System Reference Manual
Rdg
Filter
Filtering — If the repeating filter is enabled, the instrument samples the specified
number of reading conversions to yield a 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 and operation loops back to the beginning of the Device
Action in
(Figure
8-2). The hold count specifies how many readings have to be
within the window before it is accepted. See
for operation details. After a Hold Reading is acquired, operation proceeds to
Channel Closure.
Channel Closure — When scanning using a 7702 module, the last device action is
channel control. Using the hold feature provides an autosettling 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.
(Figure
8-2):
Hold
Chan
DEVICE ACTION
"Reading hold (autosettle)," page
To Output Trigger
Block of Figure 8-1
8-6,
8-5
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