Fluke NetDAQ 2640A, Service Manual

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Introduction and Specification
Specifications
1
1-11
Trigger In 1-15.
Table 1-8 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 1-8. 2640A/2645A Trigger In (TI) Specification
Specification Characteristic
Logical High - Trigger not set Minimum: 2.0V
Maximum: 7.0V
Logical Low - Trigger set Minimum: -0.6V
Maximum: +0.8V
Compatibility TTL or Contact Closure
Isolation None (dc coupled)
Minimum Pulse Width 5 µs
Maximum Frequency Nominal 400 Hz
Repeatability 3 ms
Trigger Out 1-16.
Table 1-9 provides a summary of the Trigger Out specifications. The Trigger Out output
is located on the ALARM/TRIGGER I/O connector, terminals TO and GND.
Table 1-9. 2640A/2645A Trigger Out (TO) Specification
Specification Characteristic
TTL Logical Zero - Trigger Out Set 0.8V maximum for an Iout of -1.0 mA (1 LSTTL load)
TTL Logical One - Trigger Out Not Set 3.8V minimum for an Iout of 0.05 mA (1 LSTTL load)
Non-TTL Logical Zero - Trigger Out Set 1.8V maximum for an Iout of -20 mA
Non-TTL Logical One - Trigger Out Not Set 3.25V maximum for an Iout of -50 mA
Pulse Duration (Logic Low) 125 µs
Isolation None
Master Alarm 1-17.
Table 1-10 provides a summary of the Master Alarm specifications. The Master Alarm
output is located on the ALARM/TRIGGER I/O connector, terminals MA and GND.
Table 1-10. 2640A/2645A Master Alarm (MA) Specification
Specification Characteristic
TTL Logical Zero - Master Alarm Set 0.8V maximum for an Iout of -1.0 mA (1 LSTTL load)
TTL Logical One - Master Alarm Not Set 3.8V minimum for an Iout of 0.05 mA (1 LSTTL load)
Non-TTL Logical Zero - Master Alarm Set 1.8V maximum for an Iout of -20 mA
Non-TTL Logical One - Master Alarm Not Set 3.25V maximum for an Iout of -50 mA
Isolation None