filter setup

[Waisy]

hi i m using a op amp to add two signals of different frequencies 200Hz & 500 Hz .the sum is fed to the DAQ card . i now want to filter one of them using labview 7.1.1 built in filter VI i m having problems with the setup of the filter like the sampling freq cutoff frequency and what is the data format at th e input n output of the filter VI ??? thanx

[Guest terminator]

There are two kinds of filter vis. One takes a waveform input and the other takes an array input.

It is easiest to acquire data as a waveform from the DAQ card. Then you use the filter vi that takes a waveform datatype and the sampling frequency is included with the waveform data (as dt).

If you use the array data type you need to wire in the sampling frequency yourself.

[Waisy]

hey thanx loads terminator i lll try this n hopes it works can u tell me more abt the waveform data as dt.....takecare

There are two kinds of filter vis. One takes a waveform input and the other takes an array input.

It is easiest to acquire data as a waveform from the DAQ card. Then you use the filter vi that takes a waveform datatype and the sampling frequency is included with the waveform data (as dt).

If you use the array data type you need to wire in the sampling frequency yourself.