Olympus 38DL PLUS, User Manual

Page: 120 / 318

DMTA-10004-01EN, Rev. D, November 2016
Chapter 7 108
ENCODER PULSE
The encoder pulse must be set in accordance with the encoder being used and it’s
specifications. The Olympus EP4/ENC Encoder Buggy is always set to
1.97 pulses/mm or 50 pulses/in..
TAKE READING EVERY
This indicates the spacing between measurements. There is fixed spacing based
on the number of pulses per inch or per millimeter of the encoder.
The smaller the spacing, the slower the maximum scan speed. Maximum scanning
speed can be calculated as follows:
Maximum scan speed = 20 × Reading spacing
Table 6 on page 108 provides sample scan-speed calculations.
Maximum B-scan distance is also dependent on the reading spacing setting. The
maximum B-scan length can be calculated as follows:
Maximum scan distance = Reading spacing × 10000
Table 7 on page 109 provides sample maximum-distance calculations.
Table 6 Sample scan ‑ speed calculations a
a. Maximum reading spacing is 595.38 mm (25 in.)
Spacing
(in.)
Max. scan speed
(in./sec)
Spacing
(mm)
Max. scan rate
(mm/sec)
0.040 (min.
spacing)
0.80 1.016 (min.
spacing)
20
0.100 2.00 1.524 30
0.200 4.00 2.032 40
0.500 10.00 12.70 254
NOTE