The Yokogawa 701978 is a high-voltage differential probe designed to measure voltage differences across floating or high common-mode voltage circuits without ground reference constraints. Operating across DC to 150 MHz bandwidth with switchable 50:1 and 500:1 attenuation ratios, it handles differential inputs up to ±1500 V (DC + AC peak) and delivers ±2% DC gain accuracy. The probe excels in power electronics, motor drive characterization, renewable energy systems, and semiconductor testing where precise signal acquisition in harsh electrical environments is essential.
Technical Specifications
• Bandwidth: DC to 150 MHz (-3 dB)
• Maximum Differential Input Voltage: ±1500 V (DC + AC peak)
• Attenuation Ratio: 50:1 / 500:1 (switchable)
– Use 50:1 for signals ≤150 V (higher resolution, lower noise)
– Use 500:1 for signals >150 V
• Overload Indicator: Triggers at ±150 V (50:1 ratio) or ±1500 V (500:1 ratio)
• Input Resistance: 4.1 MΩ ± 3% (typical)
• Input Capacitance: 5 pF to ground (typical)
• DC Gain Accuracy: ±2% (common-mode input within ±400 V)
• Common-Mode Rejection Ratio: -80 dB at 60 Hz; -50 dB at 1 MHz (typical)
• Measurement Category: CAT III 1000 V
• Output: BNC connector
• Probe Length: 2430 mm
• Weight: 200 g
• Operating Temperature: 5 to 40 °C
• Operating Humidity: 25 to 85%
• Power: External power supply required (compatible Yokogawa oscilloscope probe terminal or models 701934/700938)
– Key Features
• Switchable attenuation for optimized resolution across voltage ranges
• Low input capacitance minimizes circuit loading
• High input impedance reduces measurement disturbance
• Integrated overload protection with visual indication
• Comprehensive accessory kit: pincher tips, extension lead (1 m), resistance adapters (100 Ω, 150 Ω), high-voltage alligator clips, safety terminal adapter, and color-coded O-rings
– Typical Applications
• Power converter and inverter characterization
• Three-phase motor drive measurements
• Electric vehicle powertrain testing
• Renewable energy system analysis
• Semiconductor device switching analysis
– Compatibility & Integration
Universal BNC interface supports standard oscilloscope probe connectors. Direct compatibility with Yokogawa oscilloscopes via dedicated probe power terminals; usage with third-party instruments subject to availability of external power supply units.
