Device Action (Trigger Model) - Keithley 2000 User Manual

Device Action — Figure 4-12 provides a detailed look at the device action. If the repeat filter
is enabled, then the instrument samples the specified number of reading conversions to yield a
single filtered reading. If the moving filter is active, or filter is disabled, then only one reading
conversion is performed.
Figure 4-12
Device action
(trigger model)
If the hold feature is enabled (see :HOLD commands in Section 5), then the first processed
reading becomes the "seed" reading and operation loops back to the beginning of the device ac-
tion. After the next reading is processed, it is compared to the programmed hold window (0.01%
to 20%). If the reading is within the window, then operation again loops back to the beginning
of the device action. This looping action continues until the specified number (2 to 100) of valid
hold readings (readings within the window) have occurred. If one of the hold readings is not
within the window, then the instrument acquires a new "seed" reading and repeats the hold pro-
cess. After the hold is released, an audible beep is sounded to signal a valid measurement. The
use of Hold is explained in Section 3.
If the instrument is performing a step or scan, then the next task for device action is to open
the previous channel (if closed) and close the next channel.
If the filter, hold feature and scanning are disabled, the device action would simply be a single
reading conversion.
From Delay block of
Trigger Model (See Figure 4-11)
Conv
Conv = Reading conversion
Hold = Hold Feature process (if enabled)
Chan = Close channel (if scanning)
Device Action
Conv Conv
Filtering Process
(Filter enabled)
Remote Operation
To Output Trigger block of
Trigger Model (See Figure 4-11).
Hold Chan
4-31