2680A/2686A
Users Manual
A-4
Trigger In Specifications
The following table provides a summary of the Trigger In specifications. The
Trigger In input is located on the rear panel connector, terminals Trigger In and
Signal GND.
Table A-3. Trigger In Specification
Specification Characteristic
Logical High - Trigger not set
Minimum: 2.0 V
Maximum: 7.0 V
Logical Low - Trigger set
Minimum: -0.6 V
Maximum: +0.8 V
Compatibility
TTL or Contact Closure
Isolation
None (dc coupled)
Minimum Pulse Width
5 µs
Maximum Frequency
Nominal 400 Hz
Repeatability 3
ms
Trigger Out Specifications
The next table provides a summary of the Trigger Out specifications. The Trigger
Out output is located on the rear panel connector, terminals Trigger Out and Signal
GND.
Table A-4. Trigger Out Specification
Specification Characteristic
TTL Logical Zero - Trigger Out Set
0.8 V maximum for an Iout of -1.0 mA (1 LSTTL
load)
TTL Logical One - Trigger Out Not Set
3.8 V minimum for an Iout of 0.05 mA (1 LSTTL
load)
Non-TTL Load Zero - Trigger Out Set
1.8 V maximum for an Iout of -20 mA
3.25 V maximum for an Iout of -50 mA
Pulse Duration (Logic Low)
125 µs
Isolation None
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