Lx6 inductive sensor for diagnosing ignition system

In Stock

The sensor is designed for diagnosing distributor, DIS and COP systems (up to 6 ignition coils are diagnosed simultaneously). It’s used for measuring secondary voltage parameters, accessing ignition spark capability and identifying problems related to high-voltage wires, plugs, caps and coils.



ROTKEE (Ukraine)

Number of simultaneously diagnosed coils


Output connector


Supply voltage

not provided

Output Signal Type


Operating temperature range

-20 to 80℃

Output Signal

-0.15 to 0.15 V

Recommended Sampling Rate

250 kHz minimum

Signal Cable Length

2.5 m

Housing Material



290 g




Items Included

  • Lx6 sensor – 1 pc
Lx6 inductive sensor contents delivery

Video Tutorials

Diagnosing an ignition system with the help of the Lx6 sensor and automotive oscilloscope, connecting the sensor to the engine, oscilloscope tuning, oscillogram recording while idle running and increased load. I’ll demonstrate all of this with an example of Seat Ibiza.

Sensor Design

Six detecting heads mean making measurements using 6 ignition coils simultaneously, which allows analyzing signals from all the engine cylinders. As ignition pulses never occur instantly, signals from all detecting heads can be summed to get one signal with a series of sequential pulses identifying the ignition system as a whole.

The signal cables have such a length so as to be compatible with in-line, opposing and V-engines.

A soft microphone cable with a thick braided screen is used as a cord. BNC is used as a sensor-oscilloscope connector.

The sensor case is made of polyurethane, which makes a fragile sensitive sensor element damage-proof.

While developing the sensor, high emphasis was placed on signal cable joints as this junction is damage-prone. Each of these joints includes a circuit board with the sensor’s electronic components. The board not only supports the loads, but also fixes the cable. Such solid joints prevent cable breakdown and increase its durability.

The sensor was developed as compatible with MT Pro automotive oscilloscope as well as any other oscilloscope and analog channel.

Diagnostic Technique

The detecting element of the Lx6 sensor is an inductance coil. In order to detect a secondary voltage signal, the sensor’s detecting heads are to be fixed on the surface of the ignition coil, within its electromagnetic field. Generally, the upper part of the ignition coil is a flat area for the detecting head to be placed on. Double-sided foam sticky tape will do for the fixing on the coil case. Before assembling the surface of the coil and sensor is to be cleaned and dusted.

In order to get a synchronizing signal, you also need to use an Lx1 sensor, which is placed on the ignition coil of the first cylinder, near the Lx6 detecting head.

Sensor Operation Principle

The ignition coil of the internal-combustion engine operates on the principle of a step-up transformer and has two windings and a shared core. Therefore, when current strength in the primary winding changes, it triggers emf, which results in current strength change in the secondary winding, and vice versa. If an extra inductance coil is placed in the ignition coil’s electromagnetic field, it’ll cause emf in proportion to the changes in the coil’s magnetic field. This is how a secondary voltage waveform is obtained.

The secondary voltage signal’s shape depends on the sensor’s location in relation to the coil’s electromagnetic field. That’s why when placing a detecting head it’s advisable to keep in mind the following. The symmetry axis of the sensor’s detecting coil is to be placed along the axis of the ignition coil’s core. The distance between the coil and the head is to be as minimum as possible. If you can’t define the ignition coil’s type by eye, you can then change the sensor’s location in relation to the ignition coil until the oscilloscope receives a signal with the biggest amplitude.

The precise Lx6 synchronizing sensor’s location isn’t that crucial, as its function is restricted to detecting breakdown impulse.


Yes, usually this version of sensor is in stock, just add the sensors to the shopping cart and write “for Autoscope IV” in the order comment field.

Lx6 sensor for the automotive labscope Autoscope IV Lx6 sensor for the automotive labscope Autoscope 4