通信 英语翻译

In the calibration phase a mechanical rotary positioning
device is used to generate a set of reference
angles. For each reference angle the output from
the encoder is acquired and the errors for each digital
code of the encoder are stored in a memory for
post-processing error compensation. The accuracy
and resolution of the mechanical positioning device
must be at least four times higher than the correspondent
encoder’s values. Fig. 1 represents the system
block diagram used for calibration purposes.
The calibration system includes the encoder, a manual
or automatic precision rotary stage, a set of 8
pull-up resistors, a data acquisition board (NIDAQ
ATMIO-16E4) and a personal computer (PC).
After calibration the main characteristic of the
encoder, namely INL and DNL errors, are evaluated
and the correction coefficients, stored in the microcontroller’s
memory, are used to provide error compensation