Keithley 7001, Instruction Manual

Page: 104 / 353

Front Panel Operation
4-55
External Triggering and Trigger Link

As previously
mentioned, the trigger pulses for the asynchronous
Trigger Link are identical to the trigger pulses used for
External Triggering. The only thing that prevents them
from being used together are connection incompatibil-
ities. Trigger Link uses micro 8-pin DIN connectors
while External Triggering uses BNC connectors.
This connection problem can be resolved by using the
Model 8502 Trigger Link Adapter. The adapter has two
micro 8-pin DIN connectors and six BNC connectors.
The DIN connectors connect directly to a Trigger Link
connector on the Model 7001 using a trigger link cable.
The BNC connectors mate directly to the External Trig-
gering BNC connectors on other instruments using
standard male BNC to BNC cables.
Figure 4-22 shows how a Keithley Model 196 can be
connected to the Trigger Link of the Model 7001 using
the adapter. With this adapter, the Model 196 could be
substituted for the meter with Trigger Link in the pre-
vious example (Asynchronous Trigger Link Example
#1). With the Model 196 set for external triggering, the
test would start when STEP on the Model 7001 is
pressed.
Asynchronous Trigger Link example #2
In this example, the test system (Figure 4-23) includes
a Model 196 DMM to measure each DUT at two differ-
ent bias levels that are provided by the Model 230 volt-
age source. With the source set to the first voltage level,
the 10 channels will be scanned and measured. The
source will then be set to the second voltage level and
the 10 channels will again be scanned and measured.
Since this example uses instruments that do not have
Trigger Link (Model 196 and 230), the Model 8502 Trig-
ger Link Adapter is required. Connections are shown
in Figure 4-24.
For this example, the Models 196 and 230 are pro-
grammed for External Triggering and the Model 230 is
set to source the first voltage level. The Model 7001 is
configured as follows:
Figure 4-22
Connections using Trigger Link adapter
Trigger
Link
7001 Switch System
Trigger
Link Cable
(8501)
196 DMM
IN
OUT
External
Trigger
Input
Voltage
Complete
Output
BNC to BNC
Cables (2)
(7501)
1
2
8502
Trigger
Link
Adapter
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