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 MΩ (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