The North Atlantic 225 is a digital phase angle voltmeter engineered for precise measurement and analysis of AC waveforms across signal and reference channels. It delivers simultaneous acquisition of voltage magnitude, phase angle, harmonic content, and distortion metrics—essential for characterizing complex AC signals in power systems, avionics, and industrial test environments.
Technical Specifications
Voltage measurement spans 10 mV to 1000 V RMS across six ranges, with maximum signal input of 500 V RMS (±400 VDC). Reference voltage operates from 0.2 V to 200 V RMS. The 4½-digit LED display resolves voltage to 0.01% full-range; phase angle displays on a 4-digit readout with 0.1° resolution across 0.0° to 360.0°. Voltmeter accuracy reaches 1%, while phase angle measurements achieve 0.25% accuracy.
Operating frequencies scale by measurement mode. Total mode operates 30 Hz to 100 kHz; other modes function 30 Hz to 32 kHz. Discrete frequency configurations support 400 Hz, 800 Hz, and 3.2 kHz. Alternative specifications cite 10 Hz to 100 kHz for voltmeter function and 30 Hz to 30 kHz for phase angle. Input impedance is 1 MΩ minimum on both signal and reference channels.
– Key Features
• Measures fundamental voltage, in-phase and quadrature components, and total harmonic distortion (THD)
• Harmonic analysis captures magnitude and phase of selected harmonics
• Ratio measurements and percent deviation calculations
• dB magnitude relative to reference or selected value
• Reference frequency and amplitude measurement capability
• Reference offset adjustment: ±45°
• Manual null meter integrated on front panel
• Overload and no-sync indicators
• Solid-state circuitry with planar packaging for field serviceability
– Compatibility & Integration
Autoranging is available as an option. Optional interfaces include remote control with digital output (Option 03), rear input connectors in MS-type (Option 07) or terminal strip format (Option 08), broadband isolation (Option 05), DC recorder output (Option 06), and IEEE-488 interface per 1975 standard (Option 12). Rack mount kit support is available.
