Specifications

2640A/2645A Combined Specifications A

Table A-3. 2640A/2645A DIGITAL I/O Specification (cont)

Specification

Output Voltage - TTL Logical Zero

Output Voltage - TTL Logical One

Output Voltage - Non-TTL Load Zero

Output Voltage - Non-TTL Load One

Characteristic

0.8V maximum for an I out of -1.0 mA (1 LSTTL load)

3.8V minimum for an I out of 0.05 mA (1 LSTTL load)

1.8V maximum for an Iout of -20 mA

3.25V maximum for an Iout of -50 mA

Trigger In

A-7.

Table A-4 provides a summary of the Trigger In specifications. The Trigger In input is located on the ALARM/TRIGGER I/O connector, terminals TI and GND.

Table A-4. 2640A/2645A Trigger In (TI) Specification

Specification

Logical High - Trigger not set

Logical Low - Trigger set

Compatibility

Isolation

Minimum Pulse Width

Maximum Frequency

Repeatability

Characteristic

Minimum: 2.0V

Maximum: 7.0V

Minimum: -0.6V

Maximum: +0.8V

TTL or Contact Closure

None (dc coupled)

5 µs

Nominal 400 Hz

3 ms

A-5

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Fluke 2640A user manual Table A-4 A/2645A Trigger In TI Specification

2645A, 2640A specifications

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