2640A/2645A Totalizer; 2640A/2645A Real-Time Clock And Calendar - Fluke 2640A Service Manual

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Service Manual

2640A/2645A Totalizer

Table 1-11 provides a summary of the Totalizer specifications. The Totalizer input is
located on the DIGITAL I/O connector, terminals Σ and GND.
Maximum Input Voltage
Minimum Input Voltage
Minimum Peak Voltage
Isolation
Threshold
Hysteresis
Input Debouncing
Maximum Transition Rate
Maximum Count

2640A/2645A Real-Time Clock and Calendar

Table 1-12 provides a summary of the battery powered real-time clock and calendar.
Specification
Accuracy
Battery Life
1-12
Table 1-11. 2640A/2645A Totalizer Specification
Specification
Table 1-12. 2640A/2645A Real-Time Clock and Calendar
1 minute per month for 0°C to 50°C range
>15 unpowered instrument years for 0°C to 28°C (32°F to 82.4°F).
>6 unpowered instrument years for 0°C to 50°C (32°F to 122°F).
>4 unpowered instrument years for 50°C to 70°C (122°F to 158°F).
Characteristic
30V
-4V
2V
None (dc coupled)
1.4V
500 mV
None or 1.75 ms (selectable)
5 kHz (Debounce disabled)
500 Hz (Debounce enabled)
4,294,967,295
Characteristic
1-18.
1-19.