LTDVE8CH– INSTRUCTIONS MANUAL
21
Figure 5: operation of the input filter
As visible, the input signal is filtered by looking for pulses that hold the same state for a time of at
least
Tfilter
before the change in state is passed to the output. Please note there is a fixed input to
output propagation delay equal to this filter time constant.
Each of the four filters can be set as follows:
•
No filtering (pass through)
•
Filtering with a 10µs time constant
•
Filtering with a 20µs time constant
•
Filtering with a 50µs time constant
•
Filtering with a 100µs time constant
•
Filtering with a 200µs time constant
•
Filtering with a 500µs time constant
Setting of the filters can be done using the serial RS485 or Ethernet interfaces.
12.3. Input multiplexers
The input multiplexers are used to send the filtered inputs to the pulse generators. There are sixteen
input multiplexers organized in a 9x16 routing matrix.
Each multiplexer can have its output selected from one of the following sources:
•
No selection
•
Filtered synchronization input 1 (TR1)
•
Filtered synchronization input 2 (TR2)
•
Filtered synchronization input 3 (TR3)
•
Filtered synchronization input 4 (TR4)
•
Filtered synchronization input 5 (TR5)
•
Filtered synchronization input 6 (TR6)
•
Filtered synchronization input 7 (TR7)
•
Filtered synchronization input 8 (TR8)
input
Tfilter
output
Tfilter
Tfilter
Tfilter
