[time-nuts] HP10544a Technical Info needed
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Fri Feb 2 23:01:14 EST 2007
Gerald Molenkamp wrote:
> Hi Howard,
>
> Please find attached a schematic of the 10544, hope it helps in anyway.
>
> Regards
>
>
>
> Gerald
>
Gerald
The connection of the 10K oven monitor resistor R12 in the schematic is
incorrect.
In this position only the very small deviations in the oven supply
voltage due to its finite output impedance will be seen as Q4 turns on
and off.
The resistor should surely be connected to the junction of the
darlington (Q4) emitter and the oven heater winding resistor??
The datasheet clearly states that the duty cycle of the oven monitor
varies, as is seen with working 10544As.
Bruce
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