To calibrate the voltage and current
readings, perform the following steps:
- Connect the GUI to view results for voltage, current, active power,
and the other metering parameters.
- Configure the test source to supply
the desired voltage and current for all phases. Make sure that these are the
voltage and current calibration points with a zero-degree phase shift between
each phase voltage and current. For example, for 120V, 10A, 0° (PF = 1).
Typically, these values are the same for every phase.
- Click on the Manual cal.
button in Figure 3-12. The screen in Figure 3-14 pops up:
- Calculate the correction values for
each voltage and current. The correction values that must be entered for the
voltage and current fields are calculated using Equation 25:
Equation 25. ![TIDA-010944](/ods/images/TIDUF72/GUID-13CB2CAC-DD7E-4D34-A74A-3EE03A0602E1-low.gif)
where
- valueobserved is
the value measured by the TI meter
- valuedesired is
the calibration point configured in the AC test source
- After calculating for all voltages
and currents, input these values as is (±) for the fields
Voltage and Current for the corresponding
phases.
- Click on the Update meter
button and the observed values for the voltages and currents on the GUI settle
immediately to the desired voltages and currents.