TIDUEM8B March   2019  – February 2021

 

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3.2.1.3.2.2.1.1 Voltage and Current Gain Calibration

To calibrate the voltage and current readings, perform the following steps:

  1. Connect the GUI to view results for voltage, current, active power, and the other metering parameters.
  2. Configure the test source to supply desired voltage and current for all phases. Ensure that these are the voltage and current calibration points with a zero-degree phase shift between each phase voltage and current. For example, for 120 V, 10 A, 0° (PF = 1). Typically, these values are the same for every phase.
  3. Click on the Manual cal. button that Figure 3-12 shows. The following screen pops up from Figure 3-14:
    GUID-72A80943-1B58-490C-BF4D-D787FCF2657F-low.pngFigure 3-14 Manual Calibration Window
  4. 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 17:
    Equation 17. 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
  5. After calculating for all voltages and currents, input these values as is (±) for the fields
    Voltage and Current for the corresponding phases.
  6. 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.