The OMB-DBK90 module provides
56 channels of high-accuracy
thermocouple (TC) inputs. The
OMB-DBK90 is ideally suited for
high-channel-count TC applications,
with a maximum TC capacity of 896
channels per system. For larger
channel-count applications, multiple
mainframes can be combined for
a maximum channel capacity of
3584 channels. Thermocouples attach to the
OMB-DBK90 via mini-TC input
connectors, and any TC type
can be installed into any channel.
Each row of 14 TC inputs has
a separate cold-junction sensor
to ensure accurate readings.
OMB-DBK90 modules are housed
in a rugged all-metal package
that can be connected to an
OMB-DAQSCAN-2000 and rack-mounted
with an optional rack-mount kit.
When multiple OMB-DBK90’s are
mounted together, a male and
female P1 connector on either side
of the unit provides all system
connections so that only a single
cable is required back to the A/D
mainframe. For distributed
applications, such as throughout the
cabin of a vehicle, OMB-DBK90
modules can be mounted as
separate units. Up to 20' of cable
can be used to connect
OMB-DBK90 modules.
Each OMB-DBK90 has a built-in
auto-zero channel and a CJC
channel. The OMB-DBK90 can
measure one TC channel in 3 ms,
14 TC channels in 16 ms, and all 56
TC channels in 61 ms.
An OMB-DBK90 based system of
896 channels can be measured in
976 ms. This speed is slower than
other OMB-DBK modules to ensure
that the TC measurements are
accurate, low-noise, and stable.
Typical measurement accuracies
are better than 0.7°C, with channel-to-
channel variation typically less
than 0.5°C. If OMB-DBK90 measurements are
mixed with measurements from
other OMB-DBK options, the other
measurements can be made at their
standard 5 or 10 µs/channel rate.
Specifications
System Compatibility: Attaches to an OMB-DAQSCAN-2000 System Connector: Male and female DB37 for unit-to-unit mating
and mating with P1 on the acquisition mainframe TC Connector: Mini-TC connectors ACOM Connector Type: Pomona model 5936-0 Inputs: 56 differential TC inputs, open TC detection per channel TC Types: J, K, T, E, S, R, B, N28, N14 Speed: 1 channel in 3 ms, 14 channels in 16 ms,
56 channels in 61 ms Dimensions:
285 W x 88 D x 52 mm H (11 x 3.44 x 2.05") Weight: 0.96 kg (2.12 lb) Power Requirements: 40 mA max from ±15 V;
40 mA max from 5 V; 1400 mW total Input Impedance: 4 M Ω (differential) in parallel
with 400 pF Input Bandwidth: 1 kHz Minimum Resolution: 0.1°C for all TC types TC Accuracy: Valid for one year at 25°C ambient (see table) Operating Temperature:
-30C to 70°C (-22 to 158°F) Relative Humidity: 0 to 95% non-condensing Temperature Coefficient of Accuracy for Type T
TC: ±0.05°C for every °C away from 25°C Channel-to-Channel Crosstalk: -90 dB typ (0 to 100 Hz) DC CMRR: -80 dB typ AC CMRR: -80 dB typ (0 to 60 Hz) Maximum Common Mode Voltage: ±10 V Overvoltage Protection: ±40 V
† All dollar amounts on this site are shown in Singapore currency.
Note: Each OMB-DBK90 module is supplied with complete operator’s manual on CD ROM.
