Keithley 6482, Справочное руководство

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6482-901-01 Rev. A / August 2012 Return to Section Topics 8-17
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 8: Triggering
The above command disables the source event detector because the parameter name (SOURce)
is not included in the parameter list.
With the source event detector disabled, operation will not pause; it will continue and perform the
source action. Operation will pause at the delay event detector until an input trigger is received,
and then it will pause at the measure event detector until another input trigger is received.
Trigger delay
A programmable delay is available before the source action. The trigger delay can be set manually
from 0.00000 to 999.99990 seconds. Note that this delay is separate from the delay action of the
source, delay, and measure (SDM) cycle. The delay action is discussed in the following topic.
Source, delay, and measure actions
The SDM cycle of the Model 6482 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 set manually from 0.00000 to 9999.99800 seconds, or
autodelay can be enabled. With autodelay enabled, the Model 6482 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 8-10 , the instrument samples the specified number
of reading conversions to yield a single filtered reading (measurement). If using the moving filter or
if the filter is disabled, only a single reading conversion will yield a reading.
Figure 8-10
Measure action
Counters
Programmable counters are used to repeat operations within the trigger model layers. For
example, if performing a 10-point sweep, the trigger counter would be set to 10 (TRIGger:COUNt
10). Operation will stay in the trigger layer until the 10 source-delay-measure points of the sweep
are performed.
CONV
CONV
CONV
CONV = Reading conversion
MEASURE
action
Filter process
autorange
CALC
(repeat)