The number of bits of the single turn absolute value encoder represents the number of code channels of the code disk, Because it is a binary code disk (gray codes are the same), so its accuracy becomes several powers of 2. For example, 12 bits is the 12th power of 2, that is 4096. The resolution and accuracy of the encoder are not necessarily the same, and the accuracy depends on various factors such as scribed line, mechanical concentricity of the code disk, reading response speed, temperature characteristics, etc. If an encoder uses scribed sine wave subdivision to obtain high resolution, its accuracy is low The resolution is not improved, and the subdivision only improves the resolution. What is the precision of the reticle before subdivision and what is the precision after subdivision, so the precision of some high-resolution encoders depends on how many lines are subdivided before. For the current location data transmitted through SSI, the following "best case" and "worst case" must be considered.

The output of location data depends on several parameters, such as factor, conversion time, data format, etc. Therefore, the processing time will be different. With a processor system, you will "only" get one average response time. If you use the highest frequency of 500KHz to poll the SSI channel. I.e. (pulse time 2) μ S * 26 bits + minimum required pause time (40 microseconds) is the minimum time of about 100 seconds μ s。 Thereafter, the system will require an additional 400-500 μ S for data update, Therefore, in the "worst case", you may get the same result three times (position value)! Only using a much faster DSP or ASIC can you get a shorter time (factor 10), or use an encoder with sin / cosine code channel applied to motor control system. This design is usually not too expensive (encoder types that reduce some requirements are provided):

Incremental encoder with cable connector, absolute encoder with cable connector and sealed housing (such as parallel single turn, SSI or BISS). If the number of pulses per revolution (PPR) is selected correctly, the calibration factor can be simplified. Once the PPR is selected, or just calculate according to the formula in the technical manual. When selecting the calibration constant, remember that the closer it is to 1, the better. The value of the calibration constant is the resolution of each pulse of your best encoder.