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  931A Data Sheet
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  Model 931A Three Phase Power Meter

Model 931A with state-of-the-art PowerDSA™ Digital Signal Analysis, make more measurements, more accurately, and at a lower price than ever before. Basic accuracy of 0.05% of reading and 0.05° phase, harmonic analysis, and full three-phase capability are standard. Model 931A also incorporates full two way serial communication for use in power quality trend monitoring. The model expands usability by including transducer calibration and timer features.

Model 931A, featuring PowerDSA™ Digital Signal Analysis, measures all the basic quantities:  true-rms voltage and current, frequency and phase angle, as well as power quantities such as watts (W), watthours (Wh), volt-amperes (VA), volt-ampere hours (VAh), volt-amperes reactive (VAR), volt-amperes reactive (VARh), and power factor (PF), all with 0.11% basic accuracy  




  • High accuracy measurements.
  • PowerDSA Digital Signal Analysis.
  • Complete diagnostic functions for use in substation and industrial environments.
  • Serial Communications supports power quality trend monitoring with included software.
  • Field ready.
  • Timer / Counter functions.
  • Multiple display options including three-phase displays.
  • Power Trend Monitor and recording system.
  • Basic three-phase display - voltage, current, phase, frequency and power quantities on one convenient display.: Vector, voltage/current sequence and energy displays.

Measure harmonics and view the results graphically on the high contrast 240 x 64 graphic display. The two channels are normalized to Channel 1 fundamental phase, so you can see, for example, the relationship between current waveform distortion and voltage phase.

Other key functions include a timer / counter for measuring relay operating times, elapsed test times, or for counting input rates and events, The 931A include a full three-phase input section, for automated three-phase measurement sequences, complete with multiple display modes:

Vector Display View voltages, currents and phase angles with their vector representation.
Voltage /Current Sequence Display ― view voltage, current and phase along with positive, negative and zero sequence values.
Energy Display ― view voltage, current, phase, frequency and energy quantities on one convenient display.

     • Power Trend Monitor and Recording System ― verify phase relation, phase rotation, power direction, load balance.
• Transducer Calibration Supported.
    • CT / PT Ratios.
    • Extended Measurement Ranges.

Configuration Note
Supports two main measurement channels. Channel 1 and channel 2. Any voltage or current input signal may be selected for either channel. For basic measurements (voltage, current, frequency, phase angle) any combinations of inputs may be used. For power and energy measurements (active power, apparent power, reactive power and power factor), one voltage and one current must be selected. For three-phase measurements, the input configuration is selected automatically, based on the measurement type (foe example, 3-phase 4-wire 3-element)..



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