[volt-nuts] Technical details of Fluke 7000 voltage standard

[Will]

I remember that they advertised no switches in the signal path but 8
bit DACs instead. Makes sense, good switches and precision resistors
cost more. No service documents available from Fluke, but I am not
sure if Datron published something.

2012/8/29, Andreas Jahn <Andreas_-_Jahn at t-online.de>:
> Hello together,
>
> I have seen in a Fluke application note a block schematic of the Fluke 7000
> voltage standard.
> In the picture there are 2 DACs (10 ppm / 0.4ppm) for precise voltage
> adjustment.
> See figure 5 on page 3:
>
> http://fluke.informationstore.net/efulfillment.asp?publication=10777-eng
>
> Does anybody know if there are really DACs which are used or if its
> only the usual BCD coding switches and the resistor string?
>
> If there are really DACs: which type (voltage output or multiplying DACs)
> are
> actually used? Which integrated circuit?
> Has anyone a repair handbook with schematic or photos of the pcb?
>
> With best regards
>
> Andreas
>
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