Omega OM-USB-2404-UI, User Manual

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16
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for the range 0 to 60 °C unless otherwise noted.
Analog input
Table 1. Analog input specifications
Parameter Conditions Specification
Number of channels 4
A/D converter resolution 24-bit
A/D converter type Delta-Sigma with analog pre-filtering
Sampling mode Simultaneous
TEDS sensor type supported IEEE 1451.4 TEDS Class II (interface)
Input mode

Voltage

Current

Resistance (4-wire and 2-wire)

RTD (3-wire and 4-wire)

Thermocouple

Quarter-bridge

Half-bridge

Full-bridge
Conversion time
(No channels in TC mode) High speed 10 ms for all channels
Best 60 Hz rejection 110 ms for all channels
Best 50 Hz rejection 130 ms for all channels
High resolution 500 ms for all channels
Conversion time
(One or more channels in TC mode) High speed 20 ms for all channels
Best 60 Hz rejection 120 ms for all channels
Best 50 Hz rejection 140 ms for all channels
High resolution 510 ms for all channels
Overvoltage protection Terminals 1 and 2 ±30 V
Terminals 3 through 6, across any
combination ±60 V
Input impedance Voltage mode
(±60 V, ±15 V, ±4 V)
1 MΩ
Current mode
<40 Ω
All other modes

1 GΩ
Input bias current <1 nA
Integral non-linearity (INL) ±15 ppm
Common mode rejection ratio
(CMRR)

100 dB
Normal mode rejection ratio
(NMRR) Best 60 Hz rejection 90 dB at 60 Hz
Best 50 Hz rejection 80 dB at 50 Hz
High resolution 65 dB at 50 Hz and 60 Hz