Specifications
General
Isolation: 500 V from PC
Power Requirements:
Powered from USB, or from external
+6 to +16 VDC when used with a
bus-powered hub
Environmental:
0 to 50°C (0 to 122°F)
95% RH (non-condensing)
Dimensions:
92 W x 182 L x 45 mm H
(3.6 x 7.1 x 1.6")
Analogue Specifications
Each channel is configurable for
single-ended
or differential, Volts,
or thermocouple inputs
OMB-DAQ-54, OMB-DAQ-55:
10 single-ended, 5 differential;
Volts or TC channels
OMB-DAQ-56:
20 single-ended, 10 differential;
Volts or TC channels
Thermocouple Type
and
Temperature Ranges:
J (-100 to 700°C),
K (-200 to 1200°C),
T (-100 to 400°C),
E (-100 to 500°C),
R (400 to 1400°C),
S (400 to 1400°C),
B (700 to 1400°C),
N (-100 to 700°C)
Thermocouple Accuracy:
In very slow mode,
22 bit
resolution, includes cold
junction compensation error:
J (±1.1°C), K (±1.2°C), T (±1.1°C);
E (±1.0°C), R (±2.5°C), S (±2.6°C),
B (±3.3°C), N (±1.5°C)
Cold Junction Compensation
Accuracy: (±0.5°C),
Over-Voltage Protection: ±45 V
relative to analog Lo
AC Common Mode Rejection:
>120 dB @ 60 Hz
Channel-to-Channel Crosstalk:
<-120 dB (DC to 100 Hz);
Accuracy:
OMB-DAQ-55/56: 0.015% of reading +0.002% of range
(exclusive of noise)
OMB-DAQ-54: 0.015% of reading
+0.004% of range (exclusive
of noise)
Input Resistance: >10 M Ohm
(SE), >20 M Ohm (DE)
Bias Current: <1 nA (0-35°C)
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Frequency Measurements
(OMB-DAQ-55 and OMB-DAQ-56 only)
OMB-DAQ-55: 2 frequency/pulse
input channels
OMB-DAQ-56: 4 frequency/pulse
input channels
Operating Modes: Pulse count
(totalise), duty-cycle, and frequency
Frequency Response:
DC to 1 MHz
Input Range:
±15 V absolute maximum
<1.3 V (low), >3.8 V (high)
Pull-Up Resistor: 27 K Ohm
to +5 V
for switch or relay sensing
Debouncing: None, 0.8, 3.2,
or 13 mSec. (software selectable)
Totalise: Up to 232
counts/scan
Frequency & Duty-Cycle
(OMB-DAQ-55 and OMB-DAQ-56 only)
Resolution: 7 digits.
Actual resolution depends on scan
rate.
At 10 scans/s, resolution is
5 digits (10 ppm); at 1 scan/s,
6 digits (1 ppm)
Digital I/O
(OMB-DAQ-55 and OMB-DAQ-56 only)
Each I/O line is individually
programmable as input or output.
OMB-DAQ-55: 8 digital I/O lines
OMB-DAQ-56: 16 digital I/O lines
Each I/O line includes an open-collector
driver with a 27 K Ohm
pull-up resistor
to +5 V for output,
and a Schmitt-trigger input buffer
Digital Input
Voltage Range: ±15 V Thresholds:
<1.3 V (low), >3.8 V (high)
Digital Output
Maximum Switch Voltage:
0 to +15 Vdc (20 V for <1 minute)
Maximum Switch Current:
150 mA/output continuous,
500 mA/output peak (<100 µs),
150 mA total continuous (per bank
of 8 outputs)
Output Resistance: 10 Ohms max
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