PT2-filter

Frequency response

The PT2 filter has the transmission response of a second order delay element. Contrary to the other axis filters, it is parameterised by specifying a time constant (filter[i].time_constant). No filter prototype needs to be specified for this filter type. To activate the filter, an order > 1 (filter[i].order) must be set.

Time constant of the PT2 filter
Time constant of the PT2 filter

The figure shows the amplitude response of the PT2 filter depending on the filter[i].time_constant.

Step response of the PT2 filter
Step response of the PT2 filter

The figure shows the step response of the PT2 filter depending on the filter[i].time_constant.

Example

example

Axis filters: PT2 filter with time constant of 0.005 seconds:

filter[0].enable

1

filter[0].order

2

filter[0].type

PT2

filter[0].time_constant

5000

filter[0].share_percent

100

Example

example

Additional interface: PT2 filter with time constant of 0.005 seconds

lr_param.add_interface.enable

1

lr_param.add_interface.filter[0].enable

1

lr_param.add_interface.filter[0].order

2

lr_param.add_interface.filter[0].type

PT2

lr_param.add_interface.filter[0].time_constant

5000

lr_param.add_interface.filter[0].share_percent

100