Measurement Computing DBK Part 2 - Manual (Page 187)

DBK Option Cards and Module 907492 DBK90 pg. 13
DBK90 – Specifications
Note: Specifications are subject to change without notice.
System Compatibility: Attaches to DaqBook/2000 Series, or to a WBK40 or WBK41
System Connectors: 1 male and 1 female DB37 connector for unit-to-unit mating and for mating with P1 on the primary data
acquisition device.
TC Connectors: 56 Mini-TC connectors, oriented in 4 rows of 16
ACOM (Analog Common) Connector: DBK90’s ACOM connector accepts a 2 mm banana plug (Pomona® Electronics p/n
5936-0). The ACOM connector and 2mm jack pin provide a convenient means of connecting a line to DBK90’s
analog common.
Inputs: 56 differential TC inputs, open TC detection per channel
TC Types: J, K, T, E, S, R, B, N28, N14
Speed: Maximum TC measurement rate is 1 ms/channel
Dimensions: 285 mm W x 88 mm D x 52 mm H (11” x 3.44” x 2.05”)
Weight: 0.96 kg (2.12 lbs)
Power Requirements: 40 mA max from ±15V; 60 mA max from +5V
DBK90 Maximum Channel Capacity
Device Max. Channel Capacity
per Device Max. Channel Capacity
per System Max. DBK90 Power
Capacity per Device
DaqBook/2000
Series 896 using 16 DBK90s 3,584* using 16 DBK90s 10 DBK90s ***
WBK40, WBK41 854 using 15 DBK90s 2,562** using 15 DBK90s 10 DBK90s ***
* Presumes 4 DaqBook/2000 Series devices per system.
** Presumes 3 WBK40 / WBK41 devices attached to a WaveBook/516E
*** Presumes that no other active DBK modules are attached. A DBK32A power supply is necessary to power additional DBK90s
or other active DBK options.
Input Impedance: 4 MΩ (differential) in parallel with 400pF
Input Bandwidth: 1 kHz
Minimum Resolution: 0.1˚C for all TC types
TC Accuracy: Valid for one year 25˚C ambient, see following table and accuracy conditions
Operating Temperature: -20˚ to +80˚C
Relative Humidity: 0 to 95%, non-condensing
Temperature Coefficient of Accuracy: ±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: ±10V
Over-Voltage Protection: ±40V
TC Accuracy at Measurement Temperature in °C (±°C)
Type Min Max -100 0 100 300 500 700 900 1100 1400
J -200 760 0.8 0.7 0.7 0.8 0.9 0.9 — — —
K -200 1200 0.9 0.8 0.8 0.9 1.1 1.1 1.2 1.3 —
T -200 400 0.9 0.8 0.8 0.8 — — — — —
E -270 650 0.8 0.7 0.7 0.7 0.8 — — — —
S -50 1768 — 3.1 2.4 2.0 2.0 1.9 2.0 2.1 2.1
R -50 1768 — 3.1 2.1 2.0 1.9 1.9 1.7 1.9 2.0
B 50 1780 — — — 4.9 3.2 2.8 2.4 2.3 2.0
N28 -270 400 1.2 0.9 0.9 0.9 — — — — —
N14 0 1300 — 0.9 0.9 0.9 1.1 1.1 1.2 1.3 —
Accuracy conditions:
• Exclusive of thermocouple errors
• Exclusive of noise
• VCM = 0