Yokogawa 701251 Analog Voltage Input Module, 1MS/s

The Yokogawa 701251 Analog Voltage Input Module delivers high-speed, 2-channel voltage acquisition at 1 MS/s with 16-bit resolution and ±100 µV typical noise. Designed for precision waveform capture across DC to 300 kHz bandwidth, this isolated input module integrates directly into Yokogawa's modular data acquisition ecosystem. IsoPRO™ isolation technology enables safe 600 V measurements when paired with compatible probes, making it suitable for industrial power analysis, transient capture, and multi-channel signal monitoring in safety-critical environments.

Technical Specifications

• Input Channels: 2


• Sampling Rate: 1 MS/s (maximum)


• Resolution: 16-bit (2400 LSB/div)


• Input Type: Isolated unbalanced, BNC connectors (isolated type)


• Input Coupling: AC, DC, GND


• Input Impedance: 1 MΩ ±1%, ~35 pF


• Bandwidth (-3 dB): DC to 300 kHz (5 mV/div to 200 V/div); DC to 200 kHz (10 mV/div range)


• Sensitivity Range: 1 mV/div to 20 V/div (1:1); 10 mV/div to 200 V/div (10:1)


• Noise: ±100 µV (typical)


• Accuracy: ±0.25% (50 mV–200 V); ±0.3% (20 mV); ±0.5% (10 mV)


• Temperature Coefficient (Zero Point): ±0.02%/°C (50 mV–200 V range, typical); ±0.05%/°C (20 mV, typical); ±0.10%/°C (10 mV, typical)


• CMRR: 80 dB (50/60 Hz) minimum (typical)


• Maximum Input Voltage: 250 V (DC + AC peak) direct; 600 V with 700929 probe (10:1)


• Maximum Common Mode Voltage: 42 V (CAT I/II, direct input); 400 Vrms CAT I / 300 Vrms CAT II with probe


• Weight: ~270 g

Key Features

• Isolated unbalanced inputs protect measurement circuits from ground loops and high common-mode voltages


• Selectable AC/DC coupling and GND option for flexible signal conditioning


• IsoPRO™ isolation extends measurement range to 600 V with compatible probes


• Low noise floor (±100 µV) supports low-level signal detection


• Fast 1 MS/s sampling captures transient and AC phenomena with fidelity

Typical Applications

• Power quality monitoring and harmonic analysis


• Three-phase motor and inverter testing


• Switching circuit transient measurement


• Industrial control system validation


• Multi-channel voltage correlation studies

Compatibility & Integration Module integrates with Yokogawa DL750, DL850 series, DL850V, SL1000, SL2000, and DL950 ScopeCorder platforms via standard slot configuration.