WPM Wide-Band Power Meter

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  • Accurately measure energy, frequency and power factor supplied to variable frequency drives and other high harmonic environments

  • Meets DoE requirements as noted in 10 CFR 429 & 431 and others

  • Selected wide-band CT's to achieve system accuracy

  • RS-232, RS-422, RS-485 or USB interfaces use a simple ASCII communication protocol


Product Specifications
    Display Type No
    Core Type Direct
    Accuracy Rating View Spec Sheet for Specifics, ±0.02PF, ±0.1% F.S., ±0.1% Rdg., ±0.25% F.S.
    Agency Approval No
    Mounting Panel
    Measurement AC
    Output View Spec Sheet for Specifics
    Frequency 10-2400Hz
    Current Input 0-1000Aac
    System Configuration Single Phase, Three Phase
    Family WPM
Product Description


    The Department of Energy (DoE) issued changes to the measurement requirements for determining pump energy for equipment driven by electric variable frequency drives (VFD’s) (10 CFR 429 and 431), and also issued a NOPR EERE-2014-BT-TP-0054 making similar revisions to the standards for electrically driven air-compressors. The DoE is expected to expand its requirements across multiple categories of equipment. The new standard requires accurate measurement of the input power up to at least the 40th harmonic of 60 Hz. In response, OSI has developed the WPM, an economical measurement system that allows for remote reading with simple commands in an open protocol that is available to all users.

    Accurate 0.25% of reading energy measurement up to the 40th harmonic of 60 Hz
    Selected CT’s for improved system accuracy
    Simple RS-232, RS-422, RS-485 or USB interfaces (used with a simple ASCII communication protocol)

    The WPM was tested with 40th harmonic energy equal to 10% of the total energy with no significant deterioration in measurement accuracy. This was achieved by impressing 40th harmonic equal to 10% of the total on both the current and voltage signals. We believe this to be much more strenuous than what would be experienced in actual use.

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