The North Atlantic 225 Phase Angle Voltmeter is a precision AC voltage measurement instrument that decomposes complex waveforms into in-phase and quadrature components relative to a reference signal. It quantifies total voltage, fundamental voltage, phase angle, and harmonic content with 0.1° phase resolution and 0.01% voltage display resolution. The instrument operates across discrete frequencies including 400 Hz, 800 Hz, and 3.2 kHz, with total mode extending to 30 Hz–100 kHz and phase-sensitive modes to 30 Hz–32 kHz. Optional frequencies can be added with bandwidth typically 5% of nominal frequency.
Technical Specifications
Measurement Parameters
• Total voltage (average rectified, including noise and harmonics, RMS-scaled)
• Fundamental voltage component
• In-phase voltage with polarity and magnitude
• Quadrature voltage (90° out-of-phase) with polarity and magnitude
• Phase angle: 0.0° to 360.0° with 0.1° resolution
• Harmonic rejection up to 80 dB (2250A model)
Input Ranges & Impedance
• Signal voltage: 10 mV to 1000 V RMS (six ranges)
• Maximum signal input: 500 V RMS (±400 VDC max) for non-isolated inputs or with Broadband Isolation (Option 05) and DIRECT mode in Transformer Isolation (Option 04)
• Input impedance: 1 MΩ minimum (signal and reference)
Operating Frequencies
• Phase-sensitive modes: 400 Hz and 54 kHz
• Total voltage mode: 30 Hz to 100 kHz
• Other modes: 30 Hz to 32 kHz
• Optional frequencies available; bandwidth typically 5% of nominal frequency
Display & Readout
• 4½-digit voltage display with 0.01% full-range resolution
• 4-digit phase angle display with 0.1° resolution
• Overload and No Sync indicators
– Key Features
• Noise and harmonic rejection in all modes except total voltage measurement
• High input impedance enables minimal circuit loading
• Dual input architecture supports signal and reference channels
• Multi-range capability accommodates low to high voltage signals
– Typical Applications
• AC signal analysis in laboratory and industrial environments
• Automated test equipment (ATE) requiring phase characterization
• Power quality assessment and harmonic analysis
• Control system validation with phase-critical signals
– Compatibility & Integration
Optional isolation modules (Option 04 and Option 05) enable safe integration into high-voltage or floating ground environments. Custom frequency configurations available upon request.
