The North Atlantic 213C Phase Angle Voltmeter is a solid-state instrument engineered for precision measurement of AC signals with direct readout of phase angle and voltage magnitude. It simultaneously measures in-phase, quadrature, and total voltage components relative to a reference signal, making it essential for avionics, aerospace, and metrology applications demanding high-accuracy phase relationship analysis.
Technical Specifications
Measurement Capabilities
• Phase-sensitive null indicator with separate in-phase and quadrature component measurement
• Total, fundamental, in-phase, and quadrature voltage measurement
• High-resolution ratio-metric operation with 2 µV nulling sensitivity
• Impedance and power factor metering
Frequency Ranges
• Total mode (direct input): 10 Hz to 100 kHz
• Fundamental and phase-sensitive modes: 20 Hz to 3 kHz
• Phase-sensitive operation: 30 Hz to 10 kHz at pre-specified frequency with 15% bandwidth
• Transformer input: Limited to 0.75f (where f = signal frequency in Hertz)
Voltage Measurement
• Full-scale ranges: 300 µV to 300 V across 13 calibrated steps
• Accuracy (total mode): ±5% full-scale
• Accuracy (phase-sensitive frequency operation): ±2%
• Nulling sensitivity: 2 µV
Phase Angle Readout
• Parallax-free scale calibrated in 1° increments
• Measurement range: -6° to +96° across four quadrants (0°, 90°, 180°, 270°)
Input Characteristics
• Maximum input: 1.5 V to 200 V (400 Hz to 10 kHz); 3.8 V to 200 V (below 400 Hz)
• Overload indication at approximately 10× to 12× full-scale input
• Non-coherent signal rejection: ~5 Hz or greater frequency separation yields essentially zero response up to 10× full-scale; internal filters extend rejection to 300× on most sensitive ranges
– Key Features
• Passive phase shifter circuits ensure long-term stability
• Front panel switch isolates reference or signal channel
• Standard 5-way binding posts at 3/4″ centers
• 115/230 V AC input power
– Physical Specifications
• Weight: 52 lbs
– Typical Applications
Avionics instrumentation, aerospace electrical systems analysis, precision voltage and phase relationship metrology, and AC signal characterization requiring coherent component separation.
