ARC Multi-Pulse Cable Fault Locator with Handwriting Annotation | 12.1-inch XP 60km | XHGG502

The XHGG502 ARC Multi-Pulse Cable Fault Locator combines 400MHz variable-frequency sampling, 8-pulse ARC multi-pulse technology, and a 12.1-inch XP-based industrial touch computer into a single integrated field instrument. It detects low-resistance, short-circuit, open-circuit, disconnection, leakage high-resistance, and flashover high-resistance faults on power cables, high-frequency coaxial cables, street light cables, telephone cables, and buried wires across all cross-sections and dielectric media. What sets the XHGG502 apart from all other instruments in its class is the handwriting annotation system: after capturing a waveform, the operator writes directly on the touch screen — personnel name, test location, cable identification, fault characteristics, environmental conditions — and the annotations are stored as part of the waveform file. This eliminates the single biggest source of post-field confusion: a technician who returns to the office with 50 waveform files and cannot recall which waveform belongs to which cable.

Consider a typical fault investigation: an 11kV feeder trips at 03:00. The crew arrives at 05:30, tests three cable segments from two different substations, captures 18 waveform traces, and hands them to the senior engineer at 09:00 for analysis. Without annotation, the engineer sees 18 unlabeled traces — each could be the fault, a joint reflection, or system noise. The crew chief's handwritten notes, scribbled in a damp notebook at 05:30, are barely legible.

With the XHGG502, each of those 18 waveform files carries a clear, legible annotation written by the field technician: "Feeder 7B, southern manhole, 230m from substation, test leads on A-C phase, wet conditions, suspect water ingress." The senior engineer opens the file, reads the annotation, confirms the fault signature, and issues the repair order before the crew has finished breakfast. That is the difference between a waveform file and a field report.

The XHGG502's ARC (Arc Reflection) multi-pulse method — also known as the eight-pulse method — is the most advanced cable fault pre-location technique available in a portable instrument. The pulse coupler (rated 38kVDC) fires a precisely timed high-voltage pulse into the cable simultaneous with a low-voltage reference pulse. The instrument captures and displays up to 8 groups of high-voltage and low-voltage waveform pairs on the 12.1-inch screen, enabling direct visual comparison between the fault reflection and the reference trace. The principle is simple but powerful: a high-resistance fault at the arc point during flashover behaves electrically like a short circuit at that same point. The low-voltage reference pulse therefore shows the same reflection pattern as the high-voltage flashover — and the point where they match is the fault. This eliminates the "guess which reflection spike is the fault" problem that plagues single-pulse TDR interpretation on high-impedance faults.

Most cable fault locators use an embedded microcontroller driving a dedicated LCD panel — adequate for displaying a single waveform, but incapable of running a full operating system. The XHGG502 uses a complete XP-based industrial computer with a 12.1-inch sunlight-readable touch display. This has three practical consequences:

• Multi-Tasking Workflow: View the test waveform, the cable management database, and the report preview simultaneously — switch between them like any Windows application. No reboot, no mode-switching delay.
• Full Peripheral Support: External keyboard and mouse for office-based analysis. USB printer for instant hard-copy reports. USB flash drive for bulk waveform export to PC analysis software. Standard Windows file management — create folders, rename files, copy to external storage.
• Future-Proof: The XP platform can run third-party waveform analysis applications. Cable propagation velocity databases can be updated via USB. Report templates are editable — customize headers, footers, and certificate formats to match your organization's documentation standards.

• 400MHz Variable-Frequency Sampling: Four selectable rates (60/120/240/400MHz) optimize the trade-off between waveform detail and storage depth. At 400MHz, each sample point corresponds to approximately 0.25m of cable — sufficient for 0.1m reading resolution and <0.5m test accuracy.
• Fully Automatic Continuous Sampling: In flashover mode, the discharge arc lasts microseconds. The XHGG502 continuously samples at full speed — it never misses a transient event because it was "between triggers." Automatic gain and threshold adjustment compensate for varying arc intensity.
• 400Vpp Low-Voltage Pulse: Higher pulse amplitude than standard 100–300Vpp instruments provides greater penetration on long cables and through high-loss joints. 0.1μs narrow pulse for near-end fault resolution; 2μs wide pulse for >50km long-range detection.
• Automatic Report Generation: After a successful fault location, tap one button to generate a complete test report — waveform screenshot, test parameters (range, pulse width, sampling rate), calculated fault distance, V/2 propagation velocity, and operator annotations. Print via USB or export as PDF for email distribution.
• Cable Management System: Store waveforms by cable name, substation, feeder number, or project code. Searchable database with sort and filter functions. Compare historical waveforms from the same cable to track degradation trends over multiple maintenance cycles.
• 38kVDC Pulse Coupler: High-voltage-rated coupler handles the full fault-locating discharge energy with built-in safety isolation. Automatically displays the reflected signal and the full-length open-circuit reference waveform side by side for unambiguous fault identification.
• Built-in Polymer Lithium Battery: Test cable open circuits and low-resistance short circuits entirely on battery power — no generator, no mains connection required. Ideal for remote locations, street lighting networks, and situations where site power is unavailable or unreliable.
• High-Voltage Protection: The instrument is designed to operate safely in an impulse high-voltage environment. Protected inputs prevent damage or lock-up from induced transients when the flashover generator discharges — no crashes, no data loss, no reboot required.