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Model 6517B Electrometer Reference Manual
SOURCE
This menu item selects the event that controls the measure source.
IMMEDIATE: With this selection, events (such as TIMER and EXTERNAL triggers) do not control the
measurement interval. Once the Model 6517B starts measuring, it takes readings as fast as its
measurement configuration allows.
EXTERNAL: With this selection, external triggers are used to control the measure source. Each
trigger stimulus applied to the Model 6517B performs a device action, as defined by the trigger model.
In addition to a measurement, this may include range changing, filtering, calculations, data storing,
scanning, and other operations. The external trigger is applied to the rear panel trigger link connector.
The front panel TRIG key (see MANUAL below) is active with external triggering selected. Pressing
the TRIG key performs a device action.
MANUAL: With this selection, the front panel TRIG key controls the measure source. A device action
is performed 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 measure source. When the Model 6517B receives
a bus trigger (GET or *TRG), it performs a device action, as defined by the trigger model. In addition
to a measurement, this may include range changing, filtering, calculations, data storing, scanning and
other operations. See Trigger model layers for information on bus triggers. The front panel TRIG key
(see MANUAL above) is active with bus triggering selected. Pressing the TRIG key performs a device
action.
TRIGLINK: With this selection, the measure 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. When the Model 6517B receives a trigger over the trigger link, it performs
a device action, as defined by the trigger model. In addition to a measurement, this may include
range changing, filtering, calculations, data storing, scanning, and other operations. The front panel
TRIG key (see MANUAL above) is active with the trigger link selected, Pressing the TRIG key
performs a device action.
After selecting TRIGLINK as the measurement event, select one of the following trigger link modes:
ASYNCHRONOUS: The asynchronous trigger link mode is used for trigger configurations that
require input and output triggers to be routed on separate lines. After selecting this trigger link
mode, 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.
SEMI-SYNCHRONOUS: In this mode, the input and output triggers for the Model 6517B are
assigned to the same line. After selecting this trigger link mode, you are prompted to select the
trigger line.
TIMER: Use the timer to control the time interval between measurements. The timer can be set for an
interval from 0.001 seconds (1 ms) to 999999.999 seconds with 1ms resolution.
The first measurement occurs immediately, while all subsequent measurements occur 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 measurement, the next measurement does not start until the previous one
is done.
The front panel TRIG key (see MANUAL above) is active with the time selected. Pressing the TRIG
key after the completion of a measurement starts the next measurement (assuming the Model 6517B
is programmed for another measurement; see COUNT below).
6517B-901-01 Rev. C / August 2015
Section 7: Triggering
7-11
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