Ewald, I’m not sure if it would void the warranty or not, but it might. There is a ribbon cable that has 12 V power for the fans, connected internally, and you would not want to risk that shorting out. Your safest bet would be to contact support (at signal hound dot com) and we could set up an RMA to convert it to a passive cooling option. You can remove the heat sink on the passive units without voiding the warranty.
If you just need to stop the fan noise, you can set the temperature threshold higher rather than removing the fan assembly.
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