[ARC5] Testing BC-442 Thermocouples

[Mark K3MSB]

Thanks John; kinda figured that!

Mark K3MSB

Sent from my Android phone
On Aug 13, 2013 10:45 PM, "J. Forster" <jfor at quikus.com> wrote:

> The "pickup" transformer is an RF Current transformer and essentially a
> dead short at 60 Hz
>
> You either need to use RF or disconnect the TC unit from the transformer.
>
> -John
>
> ===============
>
>
>
> > I have a pair of BC-442 Relay Units on the bench and I’m trying to
> > determine if the internal thermocouples are working.
> >
> > For general testing of RF Ammeters I use my Variac at 20V through a 20
> ohm
> > series resistor.
> >
> > I tried that for both Relay Units and I get no meter deflection.  I’m
> > tapping directly into the “B” side of the pickup transformer.
> >
> > I’m suspecting the pickup transformer won’t work at 60 Hz.   I tested the
> > meter directly and it works.
> >
> > Thoughts?   Other ideas how I can test the unit (aside from just putting
> > in
> > the actual circuit, which I will after I clean up some cruddy relay
> bypass
> > “mods” in them….)
> >
> > 73 Mark K3MSB
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