Front Panel Operation
2-76
source selections, the trigger pulse is available at the
METER COMPLETE connector.
In the Measure Layer, the output trigger is always enabled
and occurs after every device action. If the control source is
set for external, immediate, manual, GPIB or timer, the out-
put trigger pulse is available at the METER COMPLETE
connector. If the trigger link (triglink) control source is se-
lected, output trigger action occurs on the selected TRIG-
GER LINK output line as follows:
• If the asynchronous Trigger Link mode is selected, the
output trigger pulse is available on the programmed
output line.
• If the semi-synchronous Trigger Link mode is selected
and the source bypass is disabled, the Trigger Link line
is released (goes high).
• If the semi-synchronous Trigger Link mode is selected
and the source bypass is enabled, the Trigger Link line
is pulled down low and then released.
Counters — All three layers use programmable counters
which allow operation to return to or stay in the respective
layer. For example, programming the Measure Layer counter
for infinity keeps operation in the Measure Layer. After each
device action and subsequent output trigger, operation loops
back to the Trigger Layer control source. A counter resets
when operation loops back to a higher layer (or idle).
2.15.2 Basic trigger configuration
The following information explains how to configure the
Model 6517A for basic triggering. If you instead wish to use
advance triggering, refer to paragraph 2.15.3. Basic trigger-
ing is configured from the BASIC 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 is provided in para-
graph 2.3.5.
The BASIC TRIGGERING menu items are explained as fol-
lows:
MODE
Use this menu item to select the trigger mode for basic trig-
gering.
CONTINUOUS: Use this trigger mode to place the instru-
ment in the continuous measurement mode.
ONE-SHOT: Use this trigger mode to place the instrument in
the one-shot measurement mode. In this mode, the instru-
ment waits for the selected control source event to occur be-
fore making a measurement (see SOURCE).
SOURCE
Use this menu item to select the control source event for one-
shot triggering.
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.
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
EXT, GPIB, or TIMER is selected.
GPIB: With this selection, bus triggers control the measure-
ment interval. When the Model 6517A receives a bus trigger
(GET or *TRG), it performs a measurement. 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 mea-
surement.
EXT: With this selection, external triggers are used to control
the measurement interval. Each trigger stimulus applied to
the Model 6517A results in a measurement.
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.
TIMER: Use the timer to control the time interval between
measurements. The timer can be set for an interval from
0.001 seconds (1msec) to 999999.999 seconds with 1msec
resolution.
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