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HYDRA
Service Manual
1-30
Table 1-4. 2635A Specifications (cont)
Digital and Alarm Outputs
Output Logic Levels
Logical "zero":
Logical "one":
0.8V max for an Iout of -1.0 mA (1 LSTTL load)
3.8V min for an Iout of 0.05 mA (1 LSTTL load)
For non-TTL loads:
Logical "zero": 1.8V max for an Iout of -20 mA
3.25V 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 unpowered instrument years for 0°C to 28°C (32°F to 82.4°F).
>3 unpowered instrument years for 0°C to 50°C (32°F to 122°F).
>2 unpowered instrument years for 50°C to 70°C (122°F to 158°F).
Environmental
Warmup Time 1 hour to rated specifications
15 minutes when relative humidity is kept below 50% (non-condensing)
Operating Temperature 0°C to 60°C (32°F to 140°F)
Storage Temperature -40°C to +70°C (-40°F to +158°F)
Instrument storage at low temperature extremes may necessitate adding
up to 0.008% to the dc voltage 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 (32°F to 82.4°F),
75% maximum for 28°C to 35°C (82.4°F to 95°F),
50% maximum for 35°C to 60°C (95°F to 140°F),
(Except 70% maximum for 0°C to 35°C (32°F to 95°F) for the 300 kΩ,
3 MΩ, and 10 MΩ ranges.)
Altitude
Operating:
Non-operating:
3,050m (10,000 ft) maximum
12,200m (40,000 ft) maximum
Vibration 0.7g at 15 Hz
1.3g at 25 Hz
3g at 55 Hz
Shock 30g half sine per Mil-T-28800
Bench handling per Mil-T-28800