How to Reduce Noise When Measuring 20MHz Frequency Using Relay

[awefopij]

Hello everyone,
I'm currently making a test machine for testing (voltage, frequency) PCBs. There are 5 test points on PCB where I need to measure frequency 20MHz. So, I'm using relay to switch around test point and connect to the probe of my oscilloscope (Keysight DSOX1202a). I've found out that relay causes a lot of noise and I'm wondering if I could get help on how to reduce noise and measure 20MHz with stability.
I've tried using SSR type relay, but noise still occurs.

Do you guys know any other relay types that are stable for measuring 20MHz or something else that I could use instead of relay?

Thanks in advance..

 

[rjenkinsgb]

Depending on the signal voltage, either analog switches (with suitable overvoltage protection) - or reed relays?

eg. Quad switch or multiplexer:

https://www.vishay.com/docs/61564/dg411.pdf

https://www.vishay.com/docs/70062/dg408.pdf

RF Reed relays:

https://www.cotorelay.com/wp-content/uploads/2014/09/9000_series_reed_relay_datasheet.pdf

(All available from Mouser etc.)