TDR Cable Fault Locator for Telecom Lead and Plastic Cables | 10km Electric Bridge | XHGG500

The XHGG500 Telecom Cable Fault Locator is a specialized diagnostic instrument for urban lead cover cables, plastic-insulated cables, and telecom copper pairs. Designed for line maintenance crews, telecom field engineers, and network quality inspection teams, it detects the full spectrum of cable impairments: broken wires, crossed lines, gas leaks (lead-sheathed), insulation degradation, and weak/high-resistance connections. The instrument integrates two complementary test methodologies — pulse reflection (TDR) and intelligent electric bridge — into a single portable unit with integrated megameter and ohmmeter functions. This eliminates the need to carry, power, and switch between three separate instruments on site, reducing troubleshooting time and the risk of test-lead connection errors.

Power cable fault locators rely primarily on TDR alone — send a pulse, measure the reflection, calculate distance. This works well on power cables with clean impedance profiles. Telecom cables, particularly older urban lead-sheathed cables and mixed plastic-insulated bundles, present a fundamentally different challenge: faults often manifest as gradually degraded insulation resistance rather than clean opens or shorts. A TDR-only approach sees elevated line loss as attenuation, not as a fault — it may report "no fault found" on a cable that fails insulation testing at 50MΩ.

Most TDR cable fault locators are designed for power cables with cross-sections measured in mm² and characteristic impedances in the 10–50Ω range. Telecom cables — particularly urban lead and plastic distribution pairs — operate at 0.3mm–0.99mm conductor diameters with impedances around 100Ω (twisted pair) and far higher attenuation per kilometer. The XHGG500's three-segment input system accommodates this range automatically, matching impedance for maximum pulse energy transfer into the cable. Without this adaptation, a standard TDR loses most of its test pulse energy at the impedance mismatch point — the instrument simply cannot "see" far enough down the cable to find distant faults.

• Auto-Gain and Auto-Impedance Balance: No manual potentiometer adjustments. The instrument automatically compensates for cable impedance variations, attenuating the transmission pulse reflection at the near end while amplifying the far-end fault reflection. Operators focus on results, not calibration.
• One-Button Auto with Manual Override: Single press initiates auto-ranging, auto-gain, auto-pulse-width selection, and fault distance calculation. Manual mode provides full waveform display for experienced technicians who prefer to interpret the trace directly.
• 10 Permanent Waveform Storage: Test results persist after power-off — no battery-backed RAM to fail. Compare waveforms from the same cable segment across different service visits to identify progressive degradation before it becomes a fault.
• English Menu Interface with Backlit Display: Clear menu-driven operation in English. Backlit LCD enables night-time and manhole operations — no external flashlight required to read the screen.
• Rechargeable Lithium Battery: 4-hour charge delivers 6 hours of continuous field operation. Intelligent charging system prevents overcharge and extends battery service life. Lightweight and portable — carry it in one hand up a ladder or into a street cabinet.
• 9999m Maximum Span: Covers the full range of urban distribution cable lengths from street cabinet to subscriber premises, including multi-kilometer lead-sheathed trunk cables in metropolitan networks.
• ±1% Accuracy: Fault distance accuracy of ±1% × cable length across the full operating range. At 5000m, the fault is located within a 50m window — sufficient to direct an excavation crew to the correct manhole or access point.