Non-Linear Junction Detectors
Instruments that find electronic devices hidden in walls and furniture, even when switched off.
All 3 models in this category
What this category solves
- An RF sweep finds nothing when the device is powered off
- Devices concealed inside walls, ceilings or furniture cannot be found visually
- High false alarm rates make a sweep unusable in a furnished room
- Corroded metal joints read like semiconductors on simple instruments
- A full-size instrument is impractical to carry between sites
Who it is for
- Corporate security teams protecting commercial confidentiality
- Facility auditors covering sensitive and restricted areas
- Executives and consultants sweeping rooms while travelling
- Hotels and residences checking for surveillance devices
What the range gives you
- Second and third harmonic detection identifying semiconductor content
- AI harmonic pattern analysis to hold the false alarm rate down
- Compliance with Ministry of Public Security standard GA1236-2015
- A folding 0.52 kg portable option alongside full-size instruments
- Wireless detection including 5G at 2.6, 3.5 and 4.9 GHz on the VT-811
Typical scenarios
- Sweeping a meeting room before a sensitive discussion
- High-security facility and safety audits
- Hotel and residential privacy checks
- Locating SIM-card devices and remote controls in restricted zones
Industries that buy this category
Non-Linear Junction Detectors FAQ
Will these find a device that is switched off
Yes. Non-linear junction detection responds to the semiconductor itself, not to a transmission, which is the whole point of the technique.
Which model should we buy
The VT-801 for full-size work at 4 W and about 4 hours, the VT-802 to travel with at 0.52 kg, and the VT-811 when active transmitters including 5G also matter.
Are they safe to use around people
The VT-801 and VT-802 are stated to comply with HJ/T10.2 radiation environmental protection guidelines.
What certification do they carry
Compliance with Ministry of Public Security standard GA1236-2015 and testing by the National Quality Supervision and Inspection Center for Safety and Alarm systems.
What language is the interface
The VT-801 source specification describes a Chinese interface. Ask us about localisation before you order.
How do we tell a real device from a corroded joint
For that specifically, the VT-818 separates cell phones, semiconductor junctions and metal oxide junctions, with spectrum and waterfall analysis.
Specifying non-linear junction detectors
Tell us the dimensions, the throughput and the environment. We will recommend the model that fits rather than the one at the top of the range.