Re: HP 8662A - alternative attenuator configurations
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Hi Tony,
I'm fairly sure you should not have anything connected to that connector. On my 8663A there are two attenuators, that each has a ribbon cable, and yes, all signals controlling the attenuators are on the ribbon cables.
I have not seen that single unit, maybe someone else has some info about it?
Unfortunately it seems as I have not taken a picture of the front open like this, so I cant say for sure how my 8663A looks like. And now it's difficult to open, as there is several instruments stacked on top of it.
Regards, Askild
Hi,
While trying to fix my HP8662A I'm trying to work out if?it is missing an output attenuator relay drive cable - or not.
There appear to be at least two attenuator configurations in these instruments. My machine has two attenuator units, each with a ribbon cable attached - which I assume are the relay drive signals. I have seen pictures of other revs of the instrument with a single larger attenuator with a drive cable that comes from the motherboard, but no ribbon cables. I attach a picture of both configs, as far as I can research them.
I can't find any HP update/change documentation on the internet about when the configuration of the attenuators for this instrument changed - or indeed, if it is an instrument option.
My question regards the attenuator drive cable. In my own instrument with 2 attenuators there is no drive cable plugged in to the motherboard (see circled area in pictures). In the single attenuator model this cable exists (again, see picture). So should my instrument have that cable (i.e. it is missing), or do the ribbon cables carry those signals and therefore does not need one?
I hope that is clear!
Many thanks
Tony
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