Test Set CMC 156
40
Time measurement on binary inputs
Due to the sampling rate and to the features of the input filters, a signal
present on binary inputs can only be sampled with a certain time tolerance.
All input binary signals are filtered on a period of 100 µs to remove possible
noise and therefore this time represents a delay in all measurements. As all
inputs are filtered in the same way, this delay does not appear when:
• we measure the difference between the switching times on two inputs, or
• we achieve synchronization between two devices.
Measurement accuracy when sensing a signal
Operating mode Time in µs
minimum maximum
Zero potential contact opening 200 400
Zero potential contact closing 110 220
Active signals 110 220
Table 18 Maximum accuracy for time measurements on one input
Measurement accuracy when assessing the difference between
switching times on two different inputs or when synchronizing two
devices (GPS)
Operating mode Time in µs
minimum maximum
Zero potential contact opening 0 200
Zero potential contact closing 0 120
Active signals 0 120
Table 19 Maximum accuracy for time measurements between two inputs or
during a synchronization
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