The North Atlantic 321A is a wideband phase angle voltmeter for precise measurement of voltage and phase relationships across a broad frequency spectrum. It measures total voltage, fundamental voltage, and in-phase/quadrature components relative to a reference input, making it essential for amplifier and network design, vibration analysis, telemetry systems, and biomedical research. The instrument employs a phase-locked loop circuit for automatic reference signal acquisition with LED lock indication, and uses proprietary circuit techniques that eliminate reactive phase shifters and filters to deliver superior accuracy and stability.
Technical Specifications
• Voltage Measurement Range: 300 µV to 300 V RMS
• Voltage Accuracy (Total Mode): ±2% of full scale
• Phase Nulling Sensitivity: 2 µV
• Quadrature Overload Capability: Up to 10× full-scale in-phase voltage
• Phase Angle Range: 0° to 360° (4 quadrants)
• Phase Angle Accuracy: ±0.5° to ±1.5° (frequency-dependent)
• Phase Dial Resolution: 0.5° increments
• Frequency Range: 10 Hz to 100 kHz (four decade ranges)
• Input Impedance: 10 MΩ shunted by 50 pF
• Input DC Voltage: 400 VDC
• Reference Input Variation: 150 mV to 150 V (no calibration required)
• Harmonic Rejection: >40 dB
– Key Features
• Phase-locked loop circuit with automatic reference input acquisition
• Lock indicator LED
• Isolated reference input—floats independent of circuit ground
• Automatic gain control maintains independent reference channel operation
• Proprietary design eliminates phase shifters and reactive filters
• Measures in-phase (0°/180°) and quadrature (90°/270°) voltage components
– Typical Applications
• Amplifier and network characterization
• Vibration analysis systems
• Telemetry signal measurement
• Biomedical research instrumentation
– Compatibility & Integration
Options include extended voltage range (Option 03), communication interfaces such as RS-232 and GPIB (Option 04), and an economy configuration (Option 09) with reduced features.
