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2620A/2625A
Users Manual
A-14
Digital and Alarm Outputs
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
Accuracy
Within 1 minute per month for 0°C to 50°C range
Battery Life
10 years minimum for Operating Temperature range
Environmental
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.
Relative Humidity (Non-Condensing)
90% maximum for 0°C to 28°C
75% maximum for 28°C to 35°C
50% maximum for 35°C to 50°C
35% maximum for 50°C to 60°C
(Except 70% maximum for 0°C to 35°C, 30% maximum for 40°C to 50°C, and 20%
maximum for 50°C to 60°C, for the 300 ke, 3 Me, and 10 Me ranges.)