Speedometer

Product Specifications

Technical details and manufacturing context for Speedometer

Definition

The speedometer is a component of a motor vehicle's instrument cluster that provides the driver with real-time visual feedback on the vehicle's road speed. It is typically calibrated in kilometers per hour (km/h) or miles per hour (mph), depending on the market. The device is essential for safe driving and for complying with speed limits. Modern speedometers operate electronically: a sensor, often a Hall-effect or magnetic type, is mounted on the transmission or a wheel to detect rotational speed. This signal is transmitted to the vehicle's electronic control unit (ECU), which processes it and sends a corresponding signal to the display mechanism—either a stepper motor driving a needle on an analog dial or a digital display. The speedometer's housing is typically made of plastic, with a glass or polycarbonate lens, and contains electronic components such as a printed circuit board (PCB), stepper motor, and LEDs. The measuring range for passenger cars is typically 0–200 km/h, though trucks may require up to 160 km/h. Accuracy is within ±2% at a reference temperature of 23°C, per ISO 16844-3. Operating voltage is 9–16 V DC for 12V systems, with load dump protection required, per ISO 16750-2. Operating temperature ranges from -40°C to 85°C, per ISO 16750-4. Ingress protection is IP54 for the rear housing and IP65 for the front panel, per IEC 60529. The display is typically LCD with backlight, and the signal input frequency is 0–1000 Hz. Weight ranges from 0.2 to 0.5 kg, depending on housing material and display size. The housing material is typically ABS with a flame-retardant grade per UL 94 HB, and the backlight color is white, with custom colors available. These specifications are reference values for directory purposes; actual values must be confirmed with the legal manufacturer or supplier for specific models and applications.

Working Principle

The speedometer measures vehicle speed using a sensor that detects rotational speed, typically from the transmission or a wheel. The sensor generates a pulse signal with a frequency proportional to speed. This signal is sent to the vehicle's ECU, which processes it and outputs a corresponding signal to the display. The display may be an analog dial driven by a stepper motor or a digital screen. The system operates within a specified voltage range and temperature range, and the accuracy is maintained within ±2% under reference conditions. The signal input frequency range is 0–1000 Hz, and the display updates in real time to provide the driver with current speed information.

Common Materials

Plastic (housing, dial), Metal (needle shaft, bezel), Glass or Polycarbonate (lens), Electronic components (PCB, stepper motor, LEDs)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measuring Range	0–200 km/h	Typical range for passenger cars; trucks may require up to 160 km/h.
Accuracy	±2 %	At reference temperature 23°C; varies with temperature.ISO 16844-3
Operating Voltage	9–16 V DC	For 12V electrical systems; load dump protection required.ISO 16750-2
Operating Temperature	-40–85 °C	Storage temperature may be wider.ISO 16750-4
Ingress Protection	IP54–IP65	IP65 for front panel; IP54 for rear housing.IEC 60529
Display Type	LCD	LCD with backlight; optional LED or analog.
Signal Input	0–1000 Hz	Pulse frequency from vehicle speed sensor.
Weight	0.2–0.5 kg	Depends on housing material and display size.
Housing Material	ABS	Flame-retardant grade; optional aluminum.UL 94 HB
Backlight Color	White	Custom colors available.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Stepper Motor
Precisely positions the needle based on electronic signals from the ECU.

Material: Metal, Copper, Magnets
Printed Circuit Board (PCB)
Processes the input signal and controls the stepper motor or digital display.

Material: Fiberglass, Copper, Electronic Components
Dial Face Part
Provides the calibrated scale (numbers and markers) for speed reading.

Material: Plastic or Metal, printed
Needle Part
The moving pointer that indicates the current speed on the dial.

Material: Plastic or Lightweight Metal

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Speedometer.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Gauge Cluster

View system integration details

Manufacturers of Speedometer

Manufacturer profiles associated with Speedometer.

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Frequently Asked Questions

What is the typical measuring range of a speedometer?

For passenger cars, the typical measuring range is 0–200 km/h. Trucks may require a range up to 160 km/h. Always confirm the specific range for your vehicle model with the manufacturer.

What accuracy can I expect from a speedometer?

The accuracy is typically within ±2% at a reference temperature of 23°C, according to ISO 16844-3. Accuracy may vary with temperature, so verify the actual performance for your application.

What are the electrical requirements for a speedometer?

The operating voltage is 9–16 V DC for 12V electrical systems, with load dump protection required as per ISO 16750-2. Ensure your vehicle's electrical system meets these requirements.

What environmental conditions can a speedometer withstand?

The operating temperature range is -40°C to 85°C, per ISO 16750-4. The ingress protection is IP54 for the rear housing and IP65 for the front panel, per IEC 60529. Confirm these ratings with the supplier for your specific model.

Data Basis

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pressure:	0 to 5 bar
other spec:	Speed range: 0-300 km/h, Vibration resistance: 5g, IP rating: IP67
temperature:	-40°C to +85°C

Product Specifications

Industry Taxonomies & Aliases

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Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

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