Cirrus Logic CRD5463PM - Manual (Page 11)

CRD5463PM
DS805RD2 11
4.6 Calibration Window
When Calibration is selected from the System menu in the main widow, the Calibration window will ap-
pear. The Calibration window is used to re-calibrate the CRD.
Figure 16. System Calibration Window
4.6.1 Calibration Connections
A stable AC source, an accurate reference power meter, and a stable AC load are needed for calibration.
Follow the connection diagram in the System Calibration window to connect the equipment and CRD. To
minimize calibration error introduced by the voltage drop on the connection wires, the power cable be-
tween the CRD and the reference meter should be as short and as large guage as possible.
4.6.2 Irms Offset Calibration
The CRD5463PM Irms offset calibration is to detect and save the residual value in the Irms register when
the load is zero. This value represents the current channel noise level of the CRD. In normal power mon-
itoring operation, this offset will be removed from the Irms register readings. The GUI also forces all the
power measurements to be zero if the Irms register value is smaller than the offset. Follow the procedure
below to operate the Irms offset calibration.
1) Turn on the power source and adjust the voltage to the nominal operation voltage.
2) Switch on the CRD5463PM.
3) Launch the GUI.
4) Open the System Calibration window
5) Turn off or remove the AC load.
6) Click the Irms Offset CAL button, the GUI will prompt the following message to confirm the load
has been removed from the system.
Figure 17. Calibration Process Confirmation Dialog