(passive?) reed relay noise filter

[fa_a2z]

Hi,

I was playing around with some variable frequency audio signal. The signal was fed into a reed relay before being fed into a passive low pass filter (1~5khz). The thing is, the signal seems to be "pre-filtered" by the relay as i got quite a clean 1khz signal output when using a 2khz low pass filter. I was expecting to see some noise, but it seems like there is none at all.
The relay datasheet can be found here:
https://www.farnell.com/datasheets/1693873.pdf

My question is:
1) if there is some noises in the range 0~50Hz(partly due to the supply i was using), how did this noise get filtered by a low pass filter with cutoff at 2khz?
2) is the relay even capable of filtering such noise?

 

[chuckey]

If you are feeding your audio through the relay coil it will be filtered by its inductance. If it is being fed via the contacts, which are a straight through contact, there will be no filtering.
Frank

 

[jiripolivka]

A relay alone does not affect the signal . It works as a bare switch.
A reed relay often has the contact tube separated from the coil by a thin aluminum foil to prevent any leakage from the coil upon the contact line.
If you can see any leakage between the contact and coil, separate carefully the external leads.