# Calculators

Posted in Customer Area

# Scale and offset calculator

For use with Analogue Input Modules. Use the calculator below to work out your scale and offset values.

### Analogue Input Calculator

See the guide for installation and setup of the Micro Input Module here.

### Typical RPM scales

 Cylinders Scale 1 120 2 60 3 40 4 30 5 24 6 20 8 15 10 12 12 10

Typically an RPM signal from an ignition coil will need to be scaled to get an RPM in the form: RPM = f *60* 2/cylinders.

This is because Input Modules gives pulses per second which we need to convert into revolutions per minute.

E.G. 1 pulse per second = 60 pulses per minute x 2 (2 revolutions of crankshaft per combustion of spark plug) = 120 divided by the number of cylinders (4) = revs per minute (30).

So, for a four cylinder engine it would be 120 divided by 4 = 30.

Try these values as starting points.

# Gear display range calculator

To display the selected gear in a VBOX scene, you will first need to log a data file with speed and RPM included in it.

To help determine which ranges are then required in your display range element, enter the RPM and GPS speed at a given point in each forward gear and click "Calculate".

A helpful guide for setting up a gear range display element can be found here.

GearSpeedRPMRange MinimumRange Maximum
1st
2nd
3rd
4th
5th
6th
7th
8th