Omega Engineering OMB-DBK-34A, User Manual

Page: 191 / 250

Channel Calibration Procedure
Adjust the Offset
The following steps are used to adjust the offset.
1. In the Param1 column (see page 19 for location), select all of the DBK43A channels that are to be
adjusted.
2. Select Mode = SetOffset from the drop down list above the grid. This selection commands the
calibration multiplexer to route the 0.0V reference through the entire analog path (see following
figure).
“Mode = Offset” 0.0 Volt Reference is Routed
3. Turn off all the channels in the system except for those DBK43A channels that are to be adjusted.
4. Click the Download button. This sends the current configuration to the LogBook.
5. Select Indictors \ Enable Input Reading Column from the menu bar. This displays the offset values for
the enabled channels.
6. Set the offset voltage to 0.0V for each transducer by adjusting the trimpot labeled OFFSET for the
associated channel.
7. Select Indictors \ Disable Input Reading Column from the menu bar.
Adjust the Input Amplifier Gain
Perform the following steps to adjust the Input Amplifier Gain.
1. In the Param1 column (see page 17 for location), select all of the DBK43A channels that are to be
adjusted.
2. Select Mode = SetInputGain from the drop down list above the grid. This selection commands the
calibration multiplexer to route a 5mV reference through the Input Amplifier and bypass the Scaling
amplifier (see following figure).
Note: If the filter is enabled (not bypassed) accommodate an additional x2 gain stage.
DBK Option Cards and Module
879895
DBK16, pg. 23