Measurement Computing DBK Part 2 - Manual (Page 52)

DBK43A & DBK43B, pg. 32 899892 DBK Option Cards and Modules
Note: Maximum gain calibration is x1000 for +5V range.
The majority of the gain should be assigned to the Input Amplifier, with the Scaling Amplifier used for
fine-tuning. If the filter is enabled, a gain of x2 is automatically introduced.
The input amplifier has a gain range of ×100 to ×1250; the filter gain ×1 or ×2; and the scaling amplifier
has a range of ×1 to ×10. For the strain gage example, if we round off our gain to ×420, any of these
possible settings will work.
Option A Option B Option C Option D
Input Gain ×420 ×100 ×240 ×300
Filter Gain (enabled) No Yes (×2) Yes (×2) * See Note No
Scaling Gain ×1 ×2.1 ×1.75 ×1.4
Total Gain ×420 ×420 ×420 ×420
For Option C, the LPF gain is typically x2.
For gains of x1 (if the filter is enabled), the following apply:
DBK16 - For a gain of x1 (if the filter is enabled),10K Ω resistors R44 and R46 must have been
previously removed (for the low and high channels, respectively).
DBK43A and DBK43B - For a gain of x1 (if the channel filters are enabled), removal of the
following 10 K Ω resistors applies: Ch0 – R144, Ch1 – R244, Ch3 – R444, Ch4 – R544,
Ch5 – R644, Ch6 – R744, Ch7 – R844.