[ARC5] BC-442

[J. Forster]

Good.

BTW, I'm not so sure the actual Amperage reading is actually meaningful.
As I remember it was more of a 'tune for max' thing, and the numbers were
more for logging purposes.

-John

===================


> It works!  Going through a 200pf cap to a 4:1 UNUN to a dummy load the 442
> is showing 2A and the wattmeter shows 30W.
>
> 73 Mark K3MSB
>
> Sent from my Android phone
> On Aug 14, 2013 12:47 PM, "Mark K3MSB" <mark.k3msb at gmail.com> wrote:
>
>> 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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>>>
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