[time-nuts] Rb standard questions

paul swed paulswedb at gmail.com
Wed Jul 31 10:07:16 EDT 2013


Thats it pin 5 in your case. Most RBs bring the lamp voltage out. In
reality its simply brightness from the photocell after amplification and
some filtering.
Regards


On Wed, Jul 31, 2013 at 7:36 AM, Mike M <timenuts at binsamp.e4ward.com> wrote:

>   > Mon Jul 29 15:04:40 EDT 2013
>
>   > Life is variable. 10 years and the lamp voltage is the best clue.
>
>   > New 9-12V, mid life 3-9, late 3 and below.
>
>   > That doesn't  mean  it  won't work but gives you  a  hint  and the
>   > voltages are approx. Use a Hz meter to measure it.
>
>   [...]
>
>   > Regards
>   > Paul
>
> Paul,
>
> When you say lamp voltage, what are you measuring?
>
> I have the LPRO repair guide by Fred de Vries. It doesn't say much about
> the lamp voltage except it appears on pin 5, and a healthy unit measures 6
> to 9 volts. There are some schematics that appear to come from a patent,
> but I couldn't find any  reference to  pin 5.
>
> http://www.radcomms.net/EFRATOM%20LPRO%20101%20Repair%20Guide.pdf
>
> So what does this voltage do in the circuit?
>
> Is there a way to measure a similar voltage on a FE-5650A or FE-5680A?
>
> Thanks,
>
> Mike M
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