Re: Pulsed electricity meter - what do I need to do ?

["Frank Mc Alinden" <frankmc@xxxxxxxxxxxxxxxx>]

Hi Chris

> I have a new electricity meter with a supposed pulsed output. The
meter
> case
> shows a picture of a transistor with the collector and emmiter
available
> externally via screw down terminals.

This is probably the output of an opto isolator...........

> I have a pulse counter with 2 screw down terminals that increments the
> count
> when the terminals are shorted.
>
> Wiring the 2 together doesn't work.

Correct...!!

> What do I have to do to make these play together - no doubt a resistor
> and/or capacitor is involved!!

I would use the output of the opto to drive another transistor which has a
relay as its load and use the contacts of the relay to pulse your device
..although this would depend on the pulsing freq of the meter output ,
worth
a try ???

HTH
Frank


----- Original Message -----
From: "christopher purves" <CHRIS_PURVES@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, November 07, 2005 6:47 PM
Subject: [ukha_d] Pulsed electricity meter - what do I need to do ?


> Hi All,
>
> I have a new electricity meter with a supposed pulsed output. The
meter
> case
> shows a picture of a transistor with the collector and emmiter
available
> externally via screw down terminals.
>
> I have a pulse counter with 2 screw down terminals that increments the
> count
> when the terminals are shorted.
>
> Wiring the 2 together doesn't work.
>
> From my school days I seem to remember you might need some current on
the
> collector to cause an avalanche to make the transistor into a switch
or
> something like that?
>
> What do I have to do to make these play together - no doubt a resistor
> and/or capacitor is involved!!
>
> Thanks
> Chris
>
>
>
>
>
>
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