With the Tru-Trac® family of products, EPC has simplified linear measurement with an integrated rotary encoder and measuring wheel. You can also customize your linear solution with the various accessory brackets and wheel options EPC offers.
In order to use EPC products with ease in your application, below are calculators to help you tailor your product selection. Uncertain what encoder CPR is needed to meet a control system’s specified or desired requirements? Or given a known CPR and resolution, what is the appropriate measuring wheel? Use these tools to narrow your selections.
Linear resolution
Linear resolution (RES) is the smallest increment of measurement required by the application. For example, if your material needs to be measured and cut down to 1/4", your required linear resolution is 0.25".
Linear resolution (RES) is typically specified in cut-to-length applications such as lumber mills, textiles, spooled cable, or rolled paper. In these applications, an encoder-measuring wheel assembly measures the distance travelled via contact with the material itself or the conveyor surface.
Pulses per unit of measurement
In applications where linear distance travelled is measured in pulses, pulses per unit of measurement (PPU) is another way to specify linear resolution. Typically a minimum number of encoder pulses per millimeter or inch is a documented design or system requirement.
This is common in applications such as printing, scanning, and x-y positioning, where devices are looking for a minimum specific number of pulses as an object travels through the system.
Convert between RES and PPU
To convert linear resolution (RES) to pulses per unit (PPU), or vice-versa, calculate as follows. Specify your unit of measurement (UOM).
RES = UOM / PPU
PPU = UOM / RES
