Measurement Computing DBK Part 2 - Manual (Page 38)

DBK43A & DBK43B, pg. 18 899892 DBK Option Cards and Modules
After we decide on a distribution option, the sensor can be hooked up to the DBK43 module, the
bridge completion resistors can be installed, the excitation voltage set, followed by setting the gains.
In this example we will be using DaqView. Steps for other programs will be similar.
7. Connect the transducer to the DBK43 module according to the figures in the Signal Connection
(page 3) and Bridge Applications (page 5). Install the appropriate bridge-completion resistors if
applicable.
8. Adjust the Excitation voltage.
Note : For DaqView versions 5.05 and higher the reading will already be correctly scaled.
(a) DBK43A users: Place CAL/NORM switch to “CAL.”
DBK43B users: Place CAL1 and CAL2 “Up.”
(b) DBK43A users:LogView users set the software CAL/NORM switch, in Hardware
Configuration, to “CAL.”
DBK43B users: LogView users set the software switch parameter to 1’CAL+2’CAL.
(c) Select “Excitation” for the Channel Type.
(d) With the Reading column enabled, set the excitation voltage for the transducer by adjusting
the trimpot labeled EXC. Note that each of the eight channels has a channel-specific
trimpot for excitation.
(e) After the excitation voltage is set, stop the Readings.
(f) DBK43A users: Return the CAL/NORM switch to the NORM position.
DBK43B users: Return CAL1 to RUN “Down” and CAL2 “Up” (CAL).
(g) DBK43A users: LogView users set the software CAL/NORM switch to “NORM.”
DBK43B users: LogView users set the software switch parameter to 1’RUN+2’CAL.
9. Adjust the Offset.
(a) DBK43A users: Place CAL/NORM switch in the NORM position.
DBK43B users: Place CAL1 “Down” (RUN) and CAL2 “Up (CAL.).
(b) DBK43A users: LogView users verify that the software CAL/NORM switch is selected to
“NORM.”
DBK43B users: LogView users verify the software switch parameter is set to
1’RUN+2’CAL.
(c) DaqView user’s: select “Offset” for the Channel Type.
LogView users: select “SetOffset” for the Mode.
(d) With the Reading column enabled, adjust the OFFSET trimpot (OFST) to obtain a channel
reading of 0.00 volts. This removes all offset from the DBK43 module’s channel circuit.
Note that each of the eight channels has a designated, channel-specific, trimpot for offset.
(e) After the Offset is adjusted to 0.00, stop the Readings.
10. Adjust the Input Gain.
(a) DBK43A users: CAL/NORM switch remains in the NORM position.
DBK43B users: Position CAL1 “Down” (Run) and position CAL2 “Up.”
(b) DaqView users: select “Input Gain” for the Channel Type.
LogView users: select “SetInputGain” for the Mode.
(c) With the Reading column enabled, adjust the GAIN trimpot to obtain a voltage reading
equal to 0.005 x G
I
, where “G
I
” is the desired input amplifier gain. Note that each of the
eight channels has a channel-specific trimpot for Input Gain.
(d) Stop the Readings.
For very high system gains you may need to first, set the Input Gain low, then set the Scaling
Gain, and then reset the Input Gain.