The XHGX507 is a pathfinder cable locator that identifies which buried line is the target, traces its route, measures its depth and locates its fault from the surface — all with one lightweight, all-digital set. Working on the principle of electromagnetic induction, the transmitter applies a signal to the line and the receiver reads the signal strength, the current and the depth above it, so a single operator can follow a buried cable or pipeline without opening the ground.
A large-screen LCD with a ladder display, arrow guidance and FM sound prompts keeps the reading clear, and a backlight makes night work practical. A built-in ohmmeter checks whether the loop is good enough to track, and a current test tells the target line apart from the parallel lines around it. Because it needs no high-voltage equipment, no AC power and no waveform analysis, wiring is simple and the instrument is easy to learn — the cable path of a charged or uncharged line and its ground insulation fault can both be found by one person.
Who It Is Built For
Built for dense routes and hard-to-read faults, not for a single simple trace
Different from a lightweight tracer that only follows an obvious line, the XHGX507 is aimed squarely at the two situations where cables are hardest to read:
Route engineers working in dense duct banks and shared trenches, where several parallel or buried cables run together. Instead of trusting signal strength alone, these crews use the receiver's current test to identify the target line: the pipeline carrying the largest measured current — not necessarily the strongest signal response — is the cable to which the transmitter signal is applied, which makes the target clear even when adjacent lines are shallower or are induced with a stronger field.
Sheath-fault location and buried-line census teams who must pinpoint a buried cable's ground insulation failure (up to 2 MOhm) or survey unknown underground lines before excavation. These crews rely on the step voltage method with the letter "A" frame for the fault point, and on the passive 50Hz signal for a quick pre-excavation census, including the death-of-ground fault that a traditional high-voltage flashover set cannot fix.
Instrument Features
All-digital positioning system: clear, reliable positioning on a large-screen LCD graph display, no earphone needed.
Path identification by current test: reads the current in the target line to separate it from adjacent pipelines.
Depth and current shown together: real-time cable depth and current display.
Built-in ohmmeter: measures the resistance of the cable loop before tracking.
Two functions in one: cable locating and fault finding.
Ground insulation fault detection up to 2 MOhm.
Portable and lightweight with a built-in rechargeable battery, so testing needs no mains electricity.
Backlight: suitable for night-time operation.
Low Frequency vs Radio Frequency
The transmitter works at low frequency (LF) and radio frequency (RF); the two suit very different site conditions. There is no fixed rule — the frequency that suits the site is the most suitable — and the guide below covers the basic choices.
| Item |
Low Frequency (LF) |
Radio Frequency (RF) |
| Best for |
Long-distance tracking of well-insulated, well-grounded cable with a good loop |
High-resistance lines: communication cable, coated pipes and cast iron pipe |
| Transmission distance |
Long — travels far with little loss |
Shorter than LF |
| Sensitivity to nearby lines |
Low — not easily induced onto adjacent lines, so fewer false readings |
High — easily induced onto adjacent metal pipes |
| Penetration |
Poor through broken joints or insulating pipe sleeves |
Better through non-metallic joints and pipe sleeves |
| Typical use |
Long runs and average cable detection |
Applied with the inductive method; keep the transmitter away from dense pipeline areas |
Keep the output power at the minimum the receiver needs. Blindly raising the power makes the signal more sensitive to neighbouring pipelines, which makes the target cable harder to identify and wastes transmitter power.
Path Tracing and Detection Modes
| Mode |
How It Works |
Best For |
| Peak Method |
Uses the horizontal coil; the signal reads at its maximum directly above the cable and falls off on both sides |
Fast tracking and depth measurement of the target cable |
| Trough Method |
Uses the vertical coil; the signal reads at its minimum (zero) directly above the cable with a peak on each side |
More accurate and reliable positioning when there is no adjacent interference |
| A-Frame Method |
Uses the letter "A" frame to read the step voltage difference around a sheath fault |
Pinpointing ground insulation faults and damaged cable sheathing |
Two signal classes: an active signal is produced by the transmitter and applied to the target line, while a passive signal is the line's own 50Hz signal — which is why an underground line can still be located for a pre-excavation census without the transmitter.
Depth Measurement and Fault Location
The receiver measures cable depth in three ways so the operator can choose by site condition: the direct-reading method (receiver directly above the cable, press the depth key), the 45-degree method (nudge the receiver to 45 degrees and move away until the signal reads zero; that distance equals the depth) and the 80% method (find the two points where the peak reading falls to 80%; the distance between them equals the depth). In an ideal environment the depth accuracy is about ±5%.
For buried cable ground faults, the XHGX507 uses the step voltage method: the transmitter injects current that leaks to earth at the fault, producing a step voltage, and the letter "A" frame reads the potential difference along the path. When the "A" frame is directly above the fault the difference between its two probes is near zero, which marks the fault point. An electromagnetic test with the peak method can also spot an open-circuit fault quickly, by watching for a sudden jump or rapid disappearance of the signal.
Technical Specifications Receiver Specifications
| Operating Frequency |
Low frequency, medium frequency, high frequency, radio frequency, 50Hz |
| Antenna Pattern |
Trough method (vertical coil), peak method (horizontal coil) |
| Working Modes |
Peak method, trough method, letter "A" frame fault finding |
| Sound Indication |
Signal intensity changes with the FM tone |
| Current Indication |
Displays the current value of the effective cable under test (unit: mA) |
| Signal Strength Display |
Ladder display, number range 0 - 999 |
| Gain Control |
Manual adjustment, dynamic range 100db |
| Detection Depth |
Maximum depth not less than 10m |
| Maximum Detection Range |
Direct method on insulated cable up to 15km |
| Accuracy |
LF: ±(1-5)% ≤ 2.5m; RF: ±(5-12)% ≤ 2.5m |
| Operating Temperature |
-10℃ to +55℃ |
| Battery Type |
7.4V lithium battery |
| Battery Life |
Continuous work > 8 hours; standby > 16 hours |
Transmitter Specifications
| Operating Frequency |
Low frequency, medium frequency, high frequency, radio frequency |
| Output Mode |
Direct method, coupling method, inductive method |
| Matched Load |
5 Ohm - 3000 Ohm |
| Impedance Display |
Five digits |
| Thermal Over-Current |
Automatic protection |
| Power Output |
Low gear, mid-range, high gear |
| Loop Resistance Measurement |
Built-in ohmmeter for checking grounding and cable fault impedance |
| Battery Type |
7.4V lithium battery |
| Battery Life |
Working 4-8 hours; intermittent work 6-10 hours (depending on use frequency and output power) |
| Operating Temperature |
-10℃ to 55℃ |
Frequently Asked Questions
Q1. Why does interference appear during detection? The locator detects the electromagnetic field produced by the signal current applied to the target line, and in an ideal case that field is a standard set of concentric circles. The most common cause of interference is that the signal on the target line is coupled onto an adjacent pipeline, which deforms the electromagnetic field and makes the readings inaccurate. The higher the output frequency, the greater the interference on adjacent piping.
Q2. How does the trough method verify the accuracy of the peak method? For an ideal interference-free line, the peak method and the trough method locate the same position. When there are parallel lines or other interference, the two methods do not coincide; in that case the real position of the pipeline lies at the peak. If the interference is severe you may not find a zero point, and the peak position can only give an approximate location — the best remedy is to change the applied signal and re-position the line. When the two methods do not coincide, direct-reading depth also has a large deviation.
Q3. How can I reduce the deformation of the electromagnetic field? First, try reducing the transmitter output power: a signal that is too strong does not always give the best result, especially where the pipeline runs parallel to another very close by. If the inductive method is used, switch to the direct connection method or the clamp method to apply the signal, which reduces coupling onto other lines and the resulting field deformation. When the peak and trough positions do not coincide, locate at the point where they do match; if no such point exists, take the peak position as the pipeline location and measure depth in the peak mode.
Q4. Why is my receiver sounding not accurate? First check that the correct operating mode — the peak mode — is selected, and that the peak and trough positions coincide. Direct-reading depth still needs a correction to be highly reliable; the correction factors include pipeline burial soil moisture and test signal frequency, usually between 0.8 and 0.95 (the wetter the soil and the higher the frequency, the smaller the factor). The simplest approach is to measure a segment of known depth without interference and compare it. Keep the receiver coil vertical to the line and turn the receiver slightly so the panel reaches its maximum reading.
Q5. What should I do if the sensor responds too much to another line? Reduce the frequency, lower the output power, and where possible use the direct method or the clamp method instead of the inductive method. Also keep the grounding point away from the target line and away from other buried pipelines, and apply the signal at the point of the target line that is farthest from other pipelines.
Need a locator that identifies the right line in a dense duct bank?
Contact XZH TEST for configuration advice and a quotation on the XHGX507 pathfinder cable locator.
