Front Panel Operation
3-66
SOURCE: With this selection, the source bypass is enabled.
The arm event will be bypassed on the first pass through the
arm layer. This allows operation to proceed into the scan lay-
er without having to wait for the programmed event.
ACCEPTOR:
With this selection, the source bypass is dis-
abled.
3.7.5 Halting triggers
The Halt option of the CONFIGURE TRIGGER menu is
used to disarm the instrument and place it in the idle state.
You can press the TRIG key to resume front panel triggers.
Perform the following steps to halt triggers:
1. Display the CONFIGURE TRIGGER menu by pressing
the CONFIG key and then the TRIG key.
2. Use the cursor keys ( and ) to place the cursor on
HALT and press ENTER to display the following tem-
porary message:
TRIGGERS HALTED
Press TRIG key to resume.
3.7.6 External triggering
The Model 2001 has BNC connections on the rear panel for
external triggering (see Figure 3-23). The EXTERNAL
TRIGGER INPUT jack allows the Model 2001 to be trig-
gered by other instruments. The METER COMPLETE
OUTPUT jack allows the Model 2001 to trigger other instru-
ments.
External trigger
The EXTERNAL TRIGGER INPUT jack requires a falling-
edge, TTL-compatible pulse with the specifications shown in
Figure 3-24.
In general, external triggers can be used as events to control
measure operations. For the Model 2001 to respond to exter-
nal triggers, the appropriate layers of trigger model must be
configured for it. Paragraphs 3.7.2 through 3.7.4 explain how
to program the three layers of the measurement.
Meter complete
The METER COMPLETE OUTPUT jack provides a TTL-
compatible output pulse that can be used to trigger other in-
struments. The specifications for this trigger pulse are shown
in Figure 3-25.
Typically, you would want the Model 2001 to output a trig-
ger after the settling time of each measurement. (Settling
time includes the internally set measurement settling time
and the user programmed DELAY period.) An output com-
pletion pulse occurs after each measurement as long as the
measure source is set to external, timer, manual, or immedi-
ate. See paragraph 3.7.2 for details on programming the mea-
sure layer.
The Model 2001 can also output a completion pulse while in
the scan and/or arm layers of operation. Figure 3-22 shows
where these triggers occur in the trigger model. If the scan
layer Source Bypass is enabled (Control = Source) and the
Scan Source is programmed for External, an output trigger
occurs on each return path through the scan layer. If the arm
layer Source Bypass is enabled (Control = Source) and the
Arm Source is programmed for External, an output trigger
occurs on each return path through the arm layer. See para-
graphs 3.7.3 and 3.7.4 for programming the Scan and arm
layers.
Figure 3-23
External triggering connectors (BNC)
EXTERNAL
TRIGGER
INPUT
METER
COMPLETE
OUTPUT
Figure 3-24
External triggering and asynchronous trigger link input
pulse specifications
Triggers on
Leading Edge
TTL High
(2V-5V)
TTL Low
(≤0.8V)
2µs
Minimum
To Next Page
Loading...
Need help?
General
