XHDD503B Digital Cable Fault Pinpointer
The XHDD503B Cable Fault Pinpointer uses acoustic-magnetic synchronization to precisely determine the location of underground cable fault points. An electronic flashover is generated by an impact discharge generator, picked up and amplified by the corresponding probe, and the precise fault point is determined through auditory and visual judgment. This instrument completes precise cable fault location within the rough measurement range while collecting acoustic and magnetic time difference data. It integrates positioning technology and path-assisted testing, offering multiple test modes with rich diagnostic information for efficient and accurate cable fault location.
Suitable for low-resistance, short-circuit, open-circuit and disconnection faults of power cables, high-frequency coaxial cables, street light cables, and buried wires made of various materials with different cross-sections and media, as well as high-resistance leakage and high-resistance flashover faults. Complies with GB/T 18268.1 and DL/T 849.2-2019 standards.
1.5-inch touch high-brightness LCD ensures clear visibility even under direct sunlight.
2.Acoustic-magnetic synchronous positioning technology automatically calculates the acoustic-magnetic time difference for precise fault pinpointing.
3.Manual gain and trigger adjustment for both acoustic and magnetic channels to adapt to various environmental conditions.
4.Multi-layer physical isolation signal sensor with IP65 waterproof protection for reliable field operation.
5.Built-in large-capacity lithium battery with ultra-long standby time and fast charger included.
6.Compact and lightweight design (7kg), easy to operate with an intuitive human-machine interface.
| Parameter |
Specification |
| Filter: All-pass |
100Hz ~ 1600Hz |
| Filter: Low-pass |
100Hz ~ 300Hz |
| Filter: High-pass |
160Hz ~ 1600Hz |
| Filter: Band-pass |
200Hz ~ 600Hz |
| Channel Adjustment (Acoustic & Magnetic) |
8 levels adjustable |
| Sound Output Gain |
16 levels (0 ~ 112dB) |
| Output Impedance |
350Ω |
| Detection Range |
0.00 ~ 99.99ms, 75mV ~ 75V |
| Positioning Accuracy |
≤0.1m |
| Display |
5-inch high-brightness touch LCD |
| Power Supply |
4 * 18650 standard lithium batteries |
| Standby Time |
More than 8 hours |
| Ambient Temperature |
-25 ~ 65℃; Relative humidity: ≤90% |
| Dimensions |
428L * 350W * 230H mm |
| Weight |
7kg |
This device uses the acoustic-magnetic synchronization method to accurately determine fault locations. Its principle is based on the traditional acoustic point determination method enhanced with electromagnetic signal detection and application.
When a high-voltage generator performs impact discharge on a faulty cable, the sound generated at the fault point is transmitted to the ground. The sound signal is picked up by a highly sensitive probe, and after amplification, a distinct "pop" sound can be heard through headphones.
The built-in probe simultaneously receives the magnetic field signal in real time. Using the principle that electromagnetic wave propagation speed far exceeds sound propagation speed, the distance to the fault point is determined by detecting the time difference between the electromagnetic and sound signals. By moving the sensor to find the point with the smallest acoustic-magnetic time difference, the exact fault location is identified directly below.
Traditional acoustic measurement instruments rely solely on headphone monitoring or meter pointer movement to distinguish fault discharge sounds. Since the discharge sound is instantaneous and often indistinguishable from ambient noise, inexperienced operators face significant challenges. The acoustic-magnetic synchronization method effectively overcomes these limitations, providing a reliable and accurate detection solution.
| Component |
Quantity |
| Cable Fault Locator (Main Unit) |
1 |
| Probe (including connecting rod and sensor) |
1 |
| 7-Core Signal Cable |
1 |
| Headphones |
1 |
| Charger |
1 |
After-Sales Service: 12-month free warranty for product quality issues, lifetime maintenance and technical support.
Frequently Asked Questions
Q: What is acoustic-magnetic synchronization and why is it important?
Acoustic-Magnetic Synchronization (AMS) measures both the sound wave (acoustic) and electromagnetic pulse (magnetic) generated during HV discharge at the fault point. Since sound travels slower than the electromagnetic wave, the time difference between the two signals confirms you are directly above the fault. This dual-channel verification eliminates false positives from ambient noise.
Q: What is the pinpointing accuracy for excavation?
The XHDD503C achieves 0.1m (10cm) pinpointing accuracy under normal soil conditions. This means the excavation zone can be limited to approximately 30-50cm diameter, dramatically reducing digging time and surface restoration costs compared to trial trenching over several meters.
Q: How do you use the pinpointer after TDR pre-location?
After the TDR provides the fault distance (e.g., 317m), use a cable route tracer to mark the cable path above ground. Walk the pinpointer along this path near the TDR-indicated distance. As you approach the fault, the acoustic signal becomes louder and the magnetic time-difference reading decreases. The strongest acoustic signal combined with the minimum time difference marks the exact fault location.
Q: Can the XHDD503C work with different types of HV generators?
Yes. The XHDD503C is compatible with any high-voltage surge generator that produces periodic discharge pulses. It works with both integrated systems (e.g., XHHV535-4TSB) and traditional test transformer + capacitor configurations. The pinpointer detects the acoustic and magnetic signals generated by the HV discharge regardless of the source equipment.
Q: What affects pinpointing depth and how can I maximize it?
Pinpointing depth depends on HV discharge energy at the fault point, soil composition (sand attenuates more than clay), and background noise levels. To maximize depth: use the highest safe discharge voltage, ensure the fault point is fully broken down (low-resistance channel), and conduct pinpointing during quieter periods (early morning or night) in high-noise urban areas.
Q: What warranty and support is provided?
12-month warranty against manufacturing defects with lifetime technical support. Package includes pinpointer unit, headphones, ground sensor, carrying case, charger, and user manual. CE and ISO certified. Extended warranty and on-site training available.
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