Front Panel Operation
2-77
The first measurement occurs immediately, while all subse-
quent 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 measure-
ment, the next measurement will not start until the previous
one is done.
NOTE
The front panel TRIG key (see MANU-
AL) is active with the time selected. Press-
ing the TRIG key after the completion of a
measurement starts the next measurement.
2.15.3 Advanced trigger configuration
The following information explains how to configure the
Model 6517A for advanced triggering. If you instead wish to
use basic triggering, refer to paragraph 2.15.2. Advanced
triggering is configured from the ADVANCED item of the
CONFIGURE TRIGGER menu (see Table 2-21), which is
displayed by pressing the CONFIG key and then the TRIG
key. General rules for navigating the menu structure are pro-
vided in paragraph 2.3.5.
Configuring measure layer
The measure layer is used for the following operations:
•To select the measuring event (SOURCE) for the instru-
ment.
•To delay operation in the measure layer.
•To designate the number of measurements the instru-
ment will make (COUNT).
•To enable or disable the Source Bypass.
The measure layer is configured from the MEASURE item
of the ADVANCED TRIGGERING menu.
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 6517A starts measuring, it will take
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 6517A performs a device action, as defined by
the trigger model. In addition to a measurement, this may in-
clude range changing, filtering, calculations, data storing,
scanning, and other operations.
The external trigger is applied to the rear panel “EXTER-
NAL TRIGGER” BNC connector. See paragraph 2.15.4 for
detailed information on external triggering.
NOTE
The front panel TRIG key (see MANU-
AL) is active with external triggering se-
lected. 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.
NOTE
The front panel TRIG key is active when
EXTERNAL, GPIB, TRIGLINK, or TIM-
ER is selected.
GPIB: With this selection, bus triggers control the measure
source. When the Model 6517A receives a bus trigger (GET
or *TRG), it performs a device action, as defined by the trig-
ger model. In addition to a measurement, this may include
range changing, filtering, calculations, data storing, scanning
and other operations. See Section 3 for detailed information
on bus triggers.
NOTE
The front panel TRIG key (see MANU-
AL) is active with bus triggering selected.
Pressing the TRIG key performs a device
action.
TRIGLINK: With this selection, the measure source is con-
trolled by the Trigger Link of the Model 6517A. Trigger
Link is an enhanced trigger system that uses up to six lines
to direct trigger pulses to an from other instruments.
When the Model 6517A 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.
See paragraph 2.15.5 for details on using the Trigger Link.
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