Encoder ppr?

I used these:
HEDR-55L2-BY07 3600 ppr 14400 cpr. with the 7i40 hbridge the positioning accuracy is + or - 0.001 mm, which is not possible with an encoder with less resolution I think.
closed loop servo-thread 8khz
pay attention, however, that the maximum frequency of these encoders is 320 khz,
for me it's fine because I go to more than 100 mm / s
regards
Mauro

The highest frequency seems to be 300 kHz on the COLT encorders.
Certainly, is the correct type of output on these transducer sensors?

Model GHST58-06-G-3600-B-M-T-5- may work

CALT 3600ppr 5000 pulse 6mm shaft servo flange optical encoder