Oh yeah, and like everybody has a spare milk bottle lying around huh? :-)
Tony
-
>All,
>
>We are at a loss to understand what all the fuss concerning the
>calibration of tachos is about. Nigel, Mark and I calibrated 52 tachos
>today on a simple set of equipment consisting of the following:
>
> One timer counter
> One signal generator (set to 833 Hz)
> One oscilloscope
> One digital multimeter
> Battery 12v
> Battery charger
> Coupling capacitor
> One 50 ohm, 1.5w resistor
> 34 patch leads
> One gramophone, circa 1972 (available from most car boot sales, cost 5)
> Six mains extension leads
> One small screwdriver
> One pint milk bottle full of water*
>
>*Required to cool the 1.5watt resistor, being unfairly asked to dissipate
>50 watts.
>
>Details of the setup are shown clearly in the attached photo. tacho test
>01
>
>Dave Simpson
>----------
From: Andy Draper <andy@europa-aircraft.co.uk>
>Subject: Re: Tacho's
>Date: Thursday, October 22, 1998 11:00 AM
>
>
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