Monarch Instrument DC1250 - Manual (Page 38)

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the ambient and input sensors. This can happen with other input types where the input
used for the OFFSET adjustment does not present 0 volts to the input.
Calibration values are copied to an EEPROM (non volatile) device when performing the
calibration operations. These values are copied from the EEPROM upon every power
up of the recorder and tested for corruption. If the values are found in error then
nominal values are inserted in all categories.
5.4 SPECIFICATIONS
Input Power:
Recorder: 9Vdc +0.5V @ 5VA (depends on external loads)
External AC Universal adaptor: 100 – 240Vac 50/60 Hz
Optional isolated: 12
– 24 Vdc input (not compatible with Battery
Backup Option)
Battery Option:
Internal battery pack provides uninterrupted operation during
black out. 6Vdc 2400 mAH NiMH
Backup Time:
Depends on external load
Without Ethernet: 6 hours typical
With Ethernet: 2.5 hours typical
Output:
2 outputs 5Vdc @ 50mA to power external sensors
Isolation
– 300V DC/AC to system ground/chassis.
No of Channels:
2
Universal DC Input:
Isolated input: 300V AC/DC to system ground/chassis. Inputs
share a common ground connection.
DC Input:
Resolution: 0.025%
Voltage:
Ranges: 0 to 250mV; 1.25V; 2.5V; 5V; 2.5V; 25V
Accuracy 0.1%.
Current:
Accuracy: 0.1% excluding 250 ohm external shunt (required)
Ranges: 0 – 20mA; 4 – 20mA; 0 – 50mA; 10 – 50mA
Thermocouple:
Accuracy: 0.3%. Ambient temp. sensor accuracy +1.5°
J -100 to 760 °C +2°C (-148 to 1400 °F +3°F)
K
1
-100 to 1000 °C +2°C (-148 to 1832 °F +3°F)
K
2
0 to 1370 °C +2°C (32 to 2498 °F +3°F)
T -100 to 400 °C +2°C (-148 to 750 °F +3°F)
E -80 to 400 °C +2°C (-112 to 750 °F +3°F)
RTD:
2 or 3 wire. Resolution 0.1°C, Accuracy 0.3%
Internal current source: 1mA
100 ohm Pt385 -100 to 750°C (-148 to 1380 °F)
100 ohm Pt 392 -100 to 750°C (-148 to 1380 °F)
Frequency Input (Hz)/ Range:
0
– 10,000 Hz or 0 – 600,000 RPM
Speed Input (RPM): Accuracy: Freq: +1Hz;
RPM: +1 RPM to 9,999 RPM then +10RPM
Input: low: <1.0Vdc high: >3.0Vdc <12Vdc
Pulse width: 10чsec minimum
Input Impedance:
>100k
Measurement Rate: up to 100 samples/sec per channel
Math Function: y = mx + b; average, hi peak., lo peak