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TDR.750A Time Domain Reflectometer

The TDR.750A is a professional Time Domain Reflectometer (TDR) designed for pre-location of cable faults in power and communication networks. It supports both the low current impulse method for locating short circuits, open circuits, and low-resistance faults, as well as the Impulse Current Method (ICM) for high-resistance and breakdown faults.

Lightweight, compact, and IP65 protected, the TDR.750A combines ease of use with reliability. With a 10.1” touchscreen, intuitive menus, and waveform storage, it is well-suited for field engineers requiring fast and precise fault diagnostics.

Key Features

  • Fault detection methods:

    • Low Current Impulse Method for low-resistance faults and cable measurement

    • ICM Method for high-resistance and breakdown faults (via coupler)

  • Fully automated measurement and fault distance display

  • Measurement range up to 65 km with 0.1% accuracy

  • High resolution (0.1 m) from an 80 MHz sampling rate

  • Selectable test ranges: 300 m / 1 km / 5 km / 25 km / 65 km

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

  • Touchscreen and keypad dual-operation for flexibility

  • Multi-language interface

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

  • Rugged IP65 case for field applications

  • Rechargeable Li-ion battery providing ~6 hours of continuous use

  • Internal storage of 8000 LV pulses and 250 flashover waveforms

Technical Specifications

  • Pulse Voltage: 0–100 V ±15%

  • Pulse Width Range: 0.125 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: 0–65 km

  • Accuracy: 0.1%

  • Resolution: 0.1 m (at v/2 = 80 m/μs)

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

  • Sampling Rate: 80 MHz

  • Storage Capacity: 8000 LV pulses, 250 flashover waveforms

  • Communication: USB

  • 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

  • Carry case included

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