If you are worried about noise etc, measuring the performance is a good idea. They will be designed with a target load impedance so the frequency of filtering will depend on what you connect it to, so it is a good idea anyway. I know this from experience in using a Velodyne's HP output which, from memory seemed to be designed for a 47kohm load. Connect it to a 10kohm load amp/measuring device and the filter frequency was then more than double the intended 80 Hz! Apart from that it measured fine.