EXTERNAL TRIGGER INPUT
DESCRIPTION
When the Model 617 is in the single trigger mode, external trigger pulses
can be used to initiate measurement conversions. Each pulse will trigger
one reading. The external trigger requires a falling edge, debounced
pulse at TTL logic level (see Figure 5). A debounced switch can be con-
nected to the EXTERNAL TRIGGER input and used to trigger readings.
Every time the switch is closed, one reading will be triggered.
OPERATION
1. Set the Model 617 to the single trigger mode (sea TRIG).
2. Input an appropriate debounced trigger pulse source to the MTER-
NAL TRIGGER INPUT.
NOTE:
Trigger pulses that are not debounced will cause trigger errors ft Err).
TYPICAL USE
Have a programmable source trigger the Model 617 to take a reading
when the source outputs a new level.
lTL HIGH
TRIGGER ON
NEGATIVE
GOING
PULSE
+2v to c5v
-z-u
TTL LOW
ov to +imv
Fig 5. Trigger Pulse Specifications
33
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