Keithley 6517A, Руководство пользователя

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Front Panel Operation
2-84
appropriate layers of the trigger model must be programmed
for it. For example, if you want Trigger Link input triggers to
control the measuring process, you must program Measure
Source for TRIGLINK trigger events. Typically, a Trigger
Link output trigger from the Model 6517A would be used to
trigger a scanner to close the next channel.
There are two modes of operation for Trigger Link: asyn-
chronous and semi-synchronous. In the asynchronous mode,
separate lines are used for input and output triggers; in the
semi-synchronous mode, the same line is used for both input
and output triggers.
Asynchronous operation
In the asynchronous operating mode, Trigger Link functions
fundamentally in the same manner as External Triggering
(see paragraph 2.15.4). Like External Triggering, the asyn-
chronous mode uses separate lines for input and output trig-
gers. Also, the asynchronous mode uses the same TTL-
compatible pulses as External Triggering. The specifications
for the input and output trigger signals of asynchronous
mode are shown in Figures 2-59 and 2-60, respectively.
For typical asynchronous Trigger Link operation, the mea-
sure layer is configured with Measure Source set to
TRIGGER LINK
2 1
5 4 3
8 7
6
Pin Trigger Link Line
1 Line #1
2 Line #2
3 Line #3
4 Line #4
5 Line #5
6 Line #6
7 Digital Common
8 Digital Common
Figure 2-63
Trigger link connector
TRIGLINK and Trigger link mode set to ASYNCHRO-
NOUS. You must also select input and output lines for the
measure layer. Input and output triggers can be set to any of
the six lines, but they cannot use the same line. For example,
if you select line #1 for input triggers, then output triggers
must use one of the other five lines (#2 through #6).
During operation in the measure layer, each Trigger Link in-
put trigger makes a measurement. After the user-pro-
grammed DELAY and the measurement settling time, the
Model 6517A outputs a Trigger Link completion pulse (typ-
ically to a scanner to close the next channel). The measure
layer is configured using he CONFIGURE TRIGGER menu
(see paragraph 2.15.3).
The scan layer and/or arm layer can also be programmed for
Trigger Link, where Scan Source is set to TRIGLINK, and
Arm Source is set to TRIGLINK. When using Trigger Link
in these layers, you must also select input and output lines as
you did in the measure layer. Keep in mind that you can use
the same lines in the scan and arm layers as selected in the
measure layer.
Asynchronous Trigger Link example #1
In a typical test system, you may want to close a channel and
then measure the DUT connected to the channel with a meter.
Such a test system is shown in Figure 2-64, which uses a
Model 6517A Electrometer to measure ten DUTs switched
by a Model 7158 multiplexer card in a Model 7001/7002
Switch System.
The Trigger Link connections for this test system are shown
in Figure 2-64, Trigger Link of the Model 6517A is connect-
ed to Trigger Link of the Model 7001/7002 Switch System.
Notice that only one Trigger Link cable is needed. For this
example, the Models 6517A and 7001/7002 are configured
as follows.