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2635A
Users Manual
A-16
Digital and Alarm Outputs
The specifications for the digital and alarm outputs are provided in the following
paragraphs.
Output Logic Levels
Logical “zero”: 0.8V max for an Iout of -1.0 mA (1LSTTL load)
Logical “one”: 3.8V min for an Iout of 0.05 mA (1LSTTL load)
For non-TTL loads: 1.8V max for an Iout or -20 mA
Logical “zero”: 3.25 max for an Iout of -50 mA
Isolation
none
Real-Time Clock and Calendar
The specifications for the real-time clock and calendar are provided in the following
paragraphs.
Accuracy
Within 1 minute per month for 0°C to 50°C range
Battery Life
>10 unpowered instrument years for 0°C to 28°C
>3 unpowered instrument years for 0°C to 50°C
>2 unpowered instrument years for 50°C to 70°C
Environmental Specifications
The environmental specifications are provided in the following paragraphs.
Warmup Time
1 hour to rated specifications
15 minutes when relative humidity is kept below the rated maximum minus 20% (e.g.
below 70% for a 90% maximum rating).
Operating Temperature
0°C to 60°C
Storage Temperature
-40°C to +75°C
Instrument storage at temperature extremes may necessitate adding up to 0.008% to the
dc and ac voltage accuracy specifications. Alternatively, any resulting shift can be
compensated for by recalibrating the instrument.