Fluke 2680A User Manual page 199

Table A-1. 2680 Series General Specifications (cont)
Specification
Relative Humidity
Altitude
Warm-up Time
Real-Time Clock and Calendar
The next table provides a summary of the battery powered real-time clock and
calendar.
Table A-2. 2680A/2686A Real-Time Clock and Calendar
Specification
Accuracy
Battery Life
90% maximum for -10
75% maximum for 28
50% maximum for 35
(3 MΩ range, reduce humidity rating by 25% for 1 hour warm-up.
3 MΩ range meets full humidity ratings with 2 hour warm-up)
Operating: 2,000 m (6,562 ft) maximum
Non-operating: 12,200 m (40,000 ft) maximum
1 hour to rated specifications -or- 15 minutes if relative humidity
(non-condensing) is 50% or less.
1 minute per month for 0 °C to 50 °C range
>5 unpowered instrument years for 20 °C to 28 °C (68 °F to 82.4 °F).
Characteristic
o o o
C to 28 C (14 F to +82
o o o
C to 35 C (82 F to +95
o o o
C to 60 C (95 F to +140
Characteristic
Appendices
Specifications
o
F)
o
F)
o
F)
A
A-3