Recently I replaced all the relays on the 34901A 20CH card. Everything went smoothly and the card works 100% After using SCPI to resett the relay count on the card, which is installed in slot 1, I query the relay count through the front panel for Channels [101:122]
During this relay-count browsing operation I saw additional channels in the RELAY COUNTS menu.
Channels "1", "2" and "3" correspond to three internal relays on the PCBs inside the 34972A, which have ref designators "K102", "K103" and "K104" This is apparent from the service manual and the user guide for the 34972A
However, at the tail end of the RELAY COUNTS menu as I'm scrolling through, there exists additional relays with counts on them: Looks like channels [193:199] also have counts on them. But I cannot find any documentation or reference in either documents I mentioned above as to where these 7 relays exist. I only see three relay symbols in the 34972A schematics for the aforementioned channels [1:3] but nothing for [193:199]
What are these channels [193:199]? Are they real or are they virtual? Where do they exist on the PCBs and does anybody here know their function?
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