all i know is the signal has a dimension of 1Vrms.

here is a link to the technical data of the slm.
http://www.warensortiment.de/bedienung/ba-schallmesser-pce-325.pdf

in the case of dc-output it was very easy. there 1dB was the same like a signal-increase of 10mv.

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i had a sound level meter with an ac-output only and wants to connect it to the DL1. in the paste i had tested it with an slm with dc-output on analog inputs at DL1. it works. now i