Fluke NetDAQ 2640A, Service Manual

Page: 28 / 260

NetDAQ
Service Manual
1-12
2640A/2645A Totalizer 1-18.
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.
Table 1-11. 2640A/2645A Totalizer Specification
Specification Characteristic
Maximum Input Voltage 30V
Minimum Input Voltage -4V
Minimum Peak Voltage 2V
Isolation None (dc coupled)
Threshold 1.4V
Hysteresis 500 mV
Input Debouncing None or 1.75 ms (selectable)
Maximum Transition Rate 5 kHz (Debounce disabled)
500 Hz (Debounce enabled)
Maximum Count 4,294,967,295
2640A/2645A Real-Time Clock and Calendar 1-19.
Table 1-12 provides a summary of the battery powered real-time clock and calendar.
Table 1-12. 2640A/2645A Real-Time Clock and Calendar
Specification Characteristic
Accuracy 1 minute per month for 0
°
C to 50
°
C range
Battery Life >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).