Phase Angle Voltmeter

Model Instrument 2251

The Model 2251 Phase Angle Voltmeter from North Atlantic Industries is one of the most versatile AC Measurement Instruments available. It employs a microprocessor-based design, utilizing Fast-Fourier Transform techniques that combine many of the capabilities of today's network/waveform analyzers in a Digital Analyzing Voltmeter configuration. Similar to Model 2250, the 2251 incorporates the most commonly used functions, providing a more cost-effective measurement instrument with fewer features and reduced accuracy requirements. This Phase Angle Voltmeter is specifically designed for the Synchro/Resolver and LVDT/RVDT marketplace. One touch allows the 2251 to make highly accurate ratio measurements in both phase-sensitive and voltage modes; measures percent, Total Harmonic Distortion and the magnitude and phase of selected harmonic, and computes the percent deviation of a signal from a selected nominal. Isolated inputs allow null, ratio and gain measurements of key parameters.

For new designs, the 2250A is the recommended replacemnt for the 2251.


The 2250 Phase Angle Voltmeter is exceptionally “user friendly”. Unlike menu-driven Instruments, by simply pressing individual switches on the front panel, you can access a wide number of functions, including:

  • Total, Fundamental, In-phase and Quadrature voltage and Phase Angle measurements
  • Reference phase offset from the Signal by up to 360 °
  • Highly accurate Ratio measurements in both phase-sensitive & voltage modes
  • Individual Voltage Ranges & Full Autorange
  • Local & Remote IEEE, GPIB Programming

The instrument calibrates itself. At turn-on or frequency change, the instrument automatically initiates a self-calibration sequence. This checks critical performance criteria and makes internal adjustments that maximize accuracy. This sequence can be initiated by the user at any time. Long term accuracy and stability is thus assured.

  • ± 0.05 % Phase Angle and ratio accuracy
  • 30 Hz to 54 kHz frequency response
  • Full Feature Display
  • IEEE Interface Standard
  • Voltage Resolution 4 1/2 Digits
  • Phase Angle Resolution 0.01 °
  • Frequency Display Resolution 3 digits
  • Self Calibrating
  • Multi-Function, High Accuracy, Digital Analyzing Phase Angle Voltmeter(PAV)
  • Replacement for obsolete models 212, 213, 214 & 321
  • Rack Mountable & Bench Top
  • 6 Inch Bi-Polar Nullmeter


  • ATE
  • Transformer Ratio & Phase Tests
  • Amplifier Gain & Phase
  • Phase Sensitive Null Detection
  • Network Transfer Function Analysis
  • Input–Output Impedance Testing
  • Wide Band, High Sensitivity Voltage Measurements
  • Attenuator Linearity Testing
  • Harmonic Analysis
  • Accelerometer Testing
  • Phase Angle Measurements
  • Synchro/Resolver Transducer Testing
  • LVDT/RVDT Testing
  • Filter Testing–Insertion Loss, Phase Shift measurement of Power Factor & Complex Impedance Phasing of Servo Motors & Servo’s

Document DownloadsDate
2251 Specifications
Phase Measurement
Phase Angle Voltmeter
Software DownloadsDate
2251 Labview Driver


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