Model 6517B Electrometer Reference Manual Section 7: Triggering
6517B-901-01 Rev. C / August 2015 7-13
Configuring scan layer
The scan layer is used for the following operations:
To select the scanning event (SOURCE) for the instrument
To delay operation in the scan layer
To designate the number of scan sequences the instrument performs (COUNT)
To enable or disable the source bypass
The scan layer is configured from the SCAN item of the ADVANCED menu.
SOURCE: This menu item selects the event that controls the scan source.
IMMEDIATE: With this selection, operation passes immediately into the measure layer.
EXTERNAL: With this selection, external triggers are used to control the scan source. A trigger
stimulus applied to the Model 6517B passes operation into the measure layer. The external trigger is
applied to the rear panel trigger link connector. The front panel TRIG key is active with external
triggering selected. Pressing the TRIG key passes operation into the measure layer.
MANUAL: With this selection, the front panel TRIG key controls the scan source. Operation passes
into the measure layer when the TRIG key is pressed. The front panel TRIG key is active when
EXTERNAL, GPIB, TRIGLINK, or TIMER is selected.
GPIB: With this selection, bus triggers control the scan source. Operation passes immediately into
the measure layer when a bus trigger (GET or *TRG) is received by the Model 6517B. The front panel
TRIG key is active with bus triggering selected. Pressing the TRIG key passes operation into the
measure layer.
TRIGLINK: With this selection, the scan source is controlled by the trigger link of the Model 6517B.
trigger link is an enhanced trigger system that uses up to six lines to direct trigger pulses to and from
other instruments. Operation passes into the measure layer when the Model 6517B receives a trigger
over the trigger link. The front panel TRIG key is active with the trigger link selected. Pressing the
TRIG key passes operation into the measure layer.
After selecting TRIGLINK, you are prompted to select an input line and then an output line. Note that
you cannot use the same trigger line for both input and output.
TIMER: Use the timer feature to control the time interval between scan sequences when scanning.
The timer can be set for an interval from 0.001 seconds (1ms) to 999999.999 seconds with 1ms
resolution.
The first scan sequence occurs immediately, while all subsequent scans start at the end of the
programmed timer interval. If, however, the programmed timer interval is shorter than the time it takes
to complete a single scan, the next scan does not start until the previous one is done. The front panel
TRIG key is active with the timer selected. Pressing the TRIG key after the completion of a scan
sequence starts the next scan sequence (assuming the Model 6517B is programmed for another
scan sequence; see COUNT (on page 7-14)).
HOLD: When HOLD is selected, the scan source is suppressed. As a result, operation does not pass
into the measure layer until HOLD is cancelled by selecting one of the other scan source selections.
Select HOLD from the SELECT SCAN SOURCE menu by placing the cursor on HOLD and pressing
ENTER. The instrument returns to the SETUP SCAN LAYER menu.
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