The VDO 411.105 Electronic Ratio Box is a versatile calibration device designed to convert and scale variable frequency signals, ensuring accurate speedometer and tachometer readings. Compatible with both 12V and 24V systems, it supports hall effect, inductive, and alternator signal inputs, delivering stable square wave, matched-voltage, or triangular wave outputs. With a frequency range of ~5 Hz to 500 Hz and an easy user-adjustable ratio, it’s ideal for automotive, marine, and industrial applications where precise signal matching is essential.
1
/
of
1
GM Instruments Pty Ltd
411.105 - Electronic Ratio Box 12/24V
411.105 - Electronic Ratio Box 12/24V
Regular price
$385.00 AUD
Regular price
Sale price
$385.00 AUD
Unit price
/
per
Shipping calculated at checkout.
Couldn't load pickup availability
Share
The VDO 411.105 Electronic Ratio Box is a versatile signal calibration device designed to convert and scale variable frequency signals for accurate speedometer and tachometer readings. Compatible with both 12V and 24V systems, it supports a range of signal inputs and outputs, making it ideal for
automotive, marine, and industrial applications.
Key Features:
Input Compatibility:
- Hall Effect Signals: 0.7–10V peak-to-peak
- Inductive (Magnetic Pickup): 1.5–50V
Output Options:
- Standard square wave: 0–10V p-p
- Optional output: Matches supply voltage (for 24V systems)
- Triangular wave output available for specialized applications
Frequency Handling:
- Max output frequency: ~500 Hz
- Min output frequency: ~5 Hz
Applications: Perfect for calibrating speedometers and tachometers using hall effect, inductive, or alternator signals
User Adjustable Ratio: Calibration is easily done through a simple trial-and-error method—no special tools required
Why Use It? - When installing new gauges or retrofitting older systems, signal mismatches are common. The VDO 411.105 ensures precise calibration, delivering a stable, fixed output signal regardless of input fluctuations.