CT3681

CT3681 is a high-voltage active differential probe designed for safe, accurate floating measurements up to ±7,000V. With a wide 70MHz bandwidth, switchable attenuation (100x / 1000x), and ±2% accuracy, it’s ideal for power electronics, motor drives, and high-voltage R&D applications. Compatible with any oscilloscope with 1 MΩ input impedance, the CT3681 operates on 4 AA batteries (included) or optional AC adapter (CT3723) or USB power lead (CT4122). It comes complete with hook probes and a user manual for immediate use. Typical applications include switching power supply development, power inverter and converter testing, motor drive system measurements and precision high-voltage differential diagnostics.

• ±700V at 100x, ±7,000V at 1000x differential input
• 5ns rise time
• High CMRR: -80dB at 50Hz
• Input impedance of 50Mohm // 7pF (to ground), 100Mohm // 5pF (between inputs)
• Output voltage swing: ±7V (driving 1Mohm oscilloscope input)
• Power and over-range indicators
• Offset (typical): ±5mV (adjustable), noise (typical): 0.9mVrms
• IEC 61010-031 CAT I safety rating
• Dimension is 202 x 83 x 38mm