747 Clock Time Base Question

[[email protected]]

I'm trying to run a Haydon slave clock from a 747 on a bench but I
don't have the pulse generating time base.

I suspect the pulse voltage is 24 VDC. Can anyone tell me the pulse
frequency of this clock system used in the older 747s?

Thanks
Tom

[Michelle P]

wrote:
> I'm trying to run a Haydon slave clock from a 747 on a bench but I
> don't have the pulse generating time base.
>
> I suspect the pulse voltage is 24 VDC. Can anyone tell me the pulse
> frequency of this clock system used in the older 747s?
>
> Thanks
> Tom
>
Suspect it is 24-28 VAC 400 Hertz
Michelle P

[[email protected]]

Thanks for the reply but I don't think that's what it is.

The time base module is supplied with 28VDC and then generates its own
clock pulses of a certain low frequency. I suspect it is one pulse per
second or the like, but not sure of the exact frequency. A quartz
clock typically puts out one pulse per second.

Thanks
Tom


Michelle P wrote:
> wrote:
> > I'm trying to run a Haydon slave clock from a 747 on a bench but I
> > don't have the pulse generating time base.
> >
> > I suspect the pulse voltage is 24 VDC. Can anyone tell me the pulse
> > frequency of this clock system used in the older 747s?
> >
> > Thanks
> > Tom
> >
> Suspect it is 24-28 VAC 400 Hertz
> Michelle P