How is resolution determined for an application if the customer does not know the performance requirements?

For a typical servo application the customer needs ~10X more resolution than accuracy to have good servo performance. In most cases, when the customer does not know what they need, it means they need low resolution. For linear, this might mean micron per count resolution, or for rotary thousands of counts per rev. High resolution would be 5-100 nm per count or for rotary >500,000 counts per rev. For rotary, it is very much dependent on radius. For very large diameters (>200 mm), the above numbers might not be considered high resolution. For low speed application, higher resolution is critical for smooth velocity profiles.​