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TDR.850A Time Domain Reflectometer

The TDR.850A is a professional-grade Time Domain Reflectometer (TDR) designed for pre-location of cable faults in power and communication networks. It applies the low current impulse method for locating low-resistance faults (short circuits, open circuits) and the ICM/Decay method for high-resistance and breakdown faults, ensuring technicians can diagnose a wide range of cable issues with high precision.

Compact, lightweight, and simple to operate, the TDR.850A is ideal for utility engineers, offering high accuracy, intuitive control, and robust field reliability.

Key Features

  • Fault detection methods:

    • Low current impulse method: for low-resistance faults and cable length measurement

    • ICM/Decay impulse method: for high-resistance and breakdown faults (with coupler)

    • ARM Arc Reflection method available only on the higher TDR.950 model

  • Fully automated measurement and real-time fault distance display

  • Measurement range up to 120 km with 0.1% accuracy

  • High resolution (0.07 m) enabled by a 400 MHz sampling rate

  • Selectable test ranges from 100 m to 100 km

  • 10.1” colour TFT touch screen with gesture operation, drag-drop cursor, and interactive menus

  • Multi-language interface with touch and keypad operation

  • Waveform storage, backup, restore, and USB communication with PC/laptop

  • Internal storage for 8000 LV pulses and 250 flashover waveforms

  • Rugged IP65 protective case for field use

  • Rechargeable Li-ion battery with up to 6 hours continuous runtime

Technical Specifications

  • Pulse Voltage: 0–300 V ±15%

  • Pulse Width Range: 0.15 µs – 10 µs

  • Voltage-Proof: Up to 400 V CAT IV, 50/60 Hz

  • Output Impedance: 0–50 Ω

  • Input Signal Gain: 0–75 dB

  • Measurement Range: 0–120 km

  • Accuracy: 0.1%

  • Resolution: 0.07 m (at v/2 = 80 m/µs)

  • Velocity of Propagation (v/2): Adjustable 50–220 m/µs

  • Sampling Rate: 400 MHz

  • Storage: 8000 LV pulses, 250 flashover waveforms

  • Communication: USB interface

  • Display: 10.1” TFT colour touch screen (1024×600)

  • Battery Type: Li-ion rechargeable (7.4 V)

  • Battery Life: ~6 hours continuous use

  • Charger: 110–240 VAC, 50/60 Hz

  • Operating Temperature: –20°C to +65°C

  • Humidity: 5–90% RH

  • Elevation: <4500 m

  • Dimensions: 284 × 168 × 358 mm

  • Weight: ~4.7 kg

  • Degree of Protection: IP65

Included Accessories

  • Main unit ×1

  • Coupler ×1

  • Single Q line ×1

  • Double Q line ×1

  • Sampler ×1

  • Power cable ×1

  • USB communication cable ×1

  • Optional: Coupler high-voltage cable A ×1, Coupler high-voltage cable B ×1, Ground wire ×1

  • Transport case included

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