MicroE Mercury II 6000 - Manual (Page 25)

Appendix
IM-Mercury_II_6000 Series Rev. 1 Page 24 ©2014 MicroE Systems
Mercury II 6000 Series Encoders
Installation Manual and Reference Guide
Resolution and Maximum Speed Tables - Serial Output
Mercury II 6800Si/Pa systems have programmable interpolation from x4 to x16384 in binary
steps. Below is a table of examples. Unlike A-quad-B encoders, the MII6800Si/Pa resolution does
not drop off with speed.
Linear – 20µ Grating Pitch
Interpolation
Multiplier
Interpolation
Bits
Resolution Maximum Speed
x 4 2 5.000µm/count 10000mm/sec
x 8 3 2.500µm/count 10000mm/sec
x 16 4 1.250µm/count 10000mm/sec
x 32 5 0.6250µm/count 10000mm/sec
x 64 6 0.3125µm/count 10000mm/sec
x 128 7 0.15625µm/count 10000mm/sec
x 256 8 0.078125µm/count 10000mm/sec
x 512 9 0.0390625µm/count 10000mm/sec
x 1024 10 19.53125nm/count 10000mm/sec
x 2048 11 9.765625nm/count 10000mm/sec
x 4096 12 4.8828125nm/count 10000mm/sec
x 8192 13 2.44140625nm/count 10000mm/sec
x 16384 14 1.220703125nm/count 10000mm/sec
Rotary – 20µ Grating Pitch
Note: The range of available values is x4 to x16384 in binary steps; sample values below.
Rotary Glass
Scale Diameter
Fundamental Resolution Interpolation
44.45mm 5000 Lines x4 x1024 x4096 x16384
interpolated resolution (CPR) 20000 5120000 20480000 81920000
interpolated resolution (arc-
sec/count)* 64.8 0.253 0.0630 0.01582
interpolated resolution (µrad/count)* 314 1.23 0.306 0.0767
maximum speed (RPM) 6000 6000 6000 6000
63.50mm 8192 Lines x4 x1024 x4096 x16384
interpolated resolution (CPR) 32768 8388608 33554432 134217728
interpolated resolution (arc-
sec/count)* 39.6 0.154 0.038 0.00966
interpolated resolution (µrad/count)* 191.7 0.749 0.187 0.0468
maximum speed (RPM) 3660 3660 3660 3660
120.65mm 16384 Lines x4 x1024 x4096 x16384
interpolated resolution (CPR) 65536 16777216 67108864 268435456
interpolated resolution (arc-
sec/count)* 19.78 0.0772 0.01978 0.00481
interpolated resolution (µrad/count)* 95.9 0.375 0.0937 0.0234
maximum speed (RPM) 1830 1830 1830 1830
Note: *Resolution values shown are approximate. To calculate exact resolution values, convert from
CPR (Counts per Revolution) to the desired units.
Note: To calculate desired rotary interpolation multiplier, use the following equation:
𝐼𝑛𝑡𝑒𝑟𝑝𝑜𝑙𝑎𝑡𝑖𝑜𝑛 𝑀𝑢𝑙𝑡𝑖𝑝𝑙𝑖𝑒𝑟 =
𝐷𝑒𝑠𝑖𝑟𝑒𝑑 𝑅𝑒𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝐶𝑃𝑅)
𝐹𝑢𝑛𝑑𝑎𝑚𝑒𝑛𝑡𝑎𝑙 𝑆𝑐𝑎𝑙𝑒 𝑅𝑒𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝐿𝑖𝑛𝑒𝑠)