Alstom SHPM 101 - Effect of High-Frequency Interference; Effect of Expotential Offset

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 32 of 71
Figure 33: Effect of expotential offset
Figure 32: Effect of high-frequency interference
Sinusoidal V – IZ input
A
Squared inputs
V – IZ
A
B
V
POL
Burst of
interference
Counter
00
No of second up-count as
changes spaced <0.15 cycle
Fault occurs
outside
boundary of
operation
Sinusoidal
V – IZ
input
V – IZ
A
B
Squared
inputs
Counter
00
1
V
POL
No second up-count as
changes spaced <0.15 cycle