HP Forum Archive 20

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Circuit for HP3421A Data aquisition Message #1 Posted by Barrie Carruthers on 29 Dec 2011, 11:37 p.m. It may sound incredible but we are still using HP 85's and HP 3421A's in our workplace. Slowly, the HP3421A's are dying, and to get them up and running again I dearly need a technical service manual or the circuit diagram of the motherboard. Can anybody help?

Re: Circuit for HP3421A Data aquisition Message #2 Posted by Diego Diaz on 30 Dec 2011, 6:34 a.m., in response to message #1 by Barrie Carruthers You've got mail. Cheers. Diego

Re: Circuit for HP3421A Data aquisition Message #3 Posted by RamLab on 30 Dec 2011, 6:22 a.m., in response to message #1 by Barrie Carruthers Hello Barrie, Good to see you are still using the HP3421A's. I do to, however mostly as MUX infront of a HP34401. But sometimes I bring out the old Thermo Couples. I still need to build a connection box for K-couples. RamLab

Re: Circuit for HP3421A Data aquisition Message #4 Posted by Barrie Carruthers on 1 Jan 2012, 3:50 a.m., in response to message #3 by RamLab Thanks for your responses guys. Now the drama starts while I try to nut out what all these error codes are really trying to tell me. Cheers

Re: Circuit for HP3421A Data aquisition Message #5 Posted by RamLab on 6 Jan 2012, 7:14 a.m., in response to message #4 by Barrie Carruthers Hi Barrie, The error codes you can find in the Operating manual on page 18. On one of the HP3421A's I get an Error 0. Most likely due to moving the 44462A Units. On the other one a 19... it took me a while to realize that that one is under HPIB control, so that's the HPIB address. Regards, RamLab

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