Omega Engineering OMB-DBK-34A, User Manual

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DBK Option Cards and Module
879895
DBK16, pg. 31
Periodic Calibration Without Trimpots
Once the trimpots have been adjusted during initial installation, periodic trimming can be performed
through LogView’s 2-Point software calibration. The LogView procedure does not require the use of
trimmpots and should not be confused with the 2-point method discussed in this section of the manual.
Refer to the LogView chapter in the LogBook User’s Manual for information regarding 2-point calibration
via software.
DBK16 – Specifications
Name/Function: 2-Channel Strain-Gage Input Card
Input Connectors : Screw terminals for signal connections
Output Connector : DB37 male, mates with P1 using CA-37-x cable
Number of Channels : 2
Excitation Voltage Range : 1.50 to 10.50 VDC @ 50 mA (on-board adjustment for external source)
Gain Range : ×100-1250
Types of Bridges Accommodated :
Full Bridge, Kelvin Excitation (6-wire)
Full Bridge (4-wire)
Half Bridge (3-wire)
Quarter Bridge (2-wire)
Bridge Resistors : On-board provisions for 4 bridge-completion resistors per channel.
Type Input : Differential DC
Input Impedance : 100 M
Ω
(in parallel with 150 pF)
CMRR : 115 dB
Excitation Voltage Source : External 13-18 VDC @ 50 mA/circuit
Excitation Current Output : 50 mA max, current limited at 60 mA
Excitation Sensing : Local or Remote
Excitation Regulation :
Line Regulation: 0.025%
Load Regulation: 0.05%
Reference Voltages : 2.500 VDC
Reference Accuracy: 0.05%
Reference Drift: 3 ppm/ºC
Gain Calibration Reference : 5.00 mVDC
Reference Accuracy: 0.2%
Reference Drift: 20 ppm/ºC
Committed instrumentation amplifier [for each section], with a gain adjust
from ×100 to ×1250 via externally accessed 15-turn trimpot.
Gain Accuracy : 0.5%
Gain Drift : 50 ppm/ºC
Input Offset : 100 µV max
Offset Drift : 4 µV/ºC
Output Offset : 20 µV
Offset Drift : 200 µV/ºC
Offset Adjustment : 0-100% of range, 0-5.00 VDC (15-Turn trimpot)
Full-Scale Sensitivity Range :
@ 5.00 VDC Excitation: 0.8 to 10 mV/V
@ 10.00 VDC Excitation: 0.4 to 5 mV/V
Scaling Amplifier Gain Range : ×1 to ×10 (15-Turn trimpot)
Low-Pass Filter : 3 pole Butterworth, User By-Passable;
-9dB @ User-set Corner Frequency