The North Atlantic 2251 is a microprocessor-based digital analyzing voltmeter that combines total voltmeter, phase angle voltmeter, and waveform signal analyzer functionality into a single instrument. It employs Fast-Fourier Transform techniques to deliver network and waveform analyzer capabilities within a digital voltmeter form factor, making it ideal for precision AC signal analysis in synchro/resolver and LVDT/RVDT applications.
Technical Specifications
Measurement Range & Resolution
• Voltage: 20 mV to 300 V RMS
• Frequency Response: 30 Hz to 54 kHz
• Voltage Resolution: 4½ digits
• Phase Angle Resolution: 0.01°
• Frequency Display Resolution: 3 digits
Measurement Accuracy
• Phase Angle and Ratio Accuracy: ±0.05%
• Automatic self-calibration upon turn-on or frequency change, with manual initiation option
• Warm-up Time: 30 minutes to achieve rated accuracy
Measurement Capabilities
• Total Voltmeter: RMS value of total AC signals including harmonics
• Phase Angle Voltmeter: Phase shift measurement in degrees, fundamental voltage, in-phase and quadrature components, and signal-to-reference ratio in total and fundamental modes
• Waveform Signal Analyzer: Magnitude and phase determination using waveform sampling and signal processing
Display & Input
• 6-inch bi-polar null meter with zero-center scale, moving LED indicator, and log scaling offering 1-LSB sensitivity at center
• Dual-channel measurement system with isolated signal and reference circuits
• Channel Isolation: 1000 MΩ shunted by 2 pF (Hi) with respect to guard; 1000 MΩ shunted by 10 pF (Lo) with respect to guard; 1000 MΩ shunted by 2000 pF between guard and case
– Key Features
• Floating input voltages with respect to circuit ground via isolated measurement channels
• Simultaneous dual-channel signal and reference analysis
• Guard-driven input architecture for noise rejection
• Local programming control
– Typical Applications
• Synchro and resolver signal characterization
• LVDT and RVDT measurement and validation
• AC waveform harmonic analysis
• Phase relationship measurement in multi-phase systems
– Compatibility & Integration
• Power requirement: 2 A fuse for 115 V operation
