Omron V640 User Manual page 128

SECTION 6
Appendix
Communications Distance Characteristics vs. Ambient Noise
The graph below compares the results of measurement using the noise measurement function with
communications distances.
At installation implement measures in regard to metal in the vicinity of the CIDRW Head, power supply
noise, and atmospheric noise, to ensure that the noise level does not exceed 10.
Noise measurement command (applies only when SECS is not used)
CIDRW System
124
User's Manual
Relationship between noise level and communications distance (reference values)
90
80
70
60
50
40
30
20
10
0
0 20 40 60
Noise level
Refer to page 86.
80 99
(Max)
(Max.)