[ARC5] BC-442

[Mark K3MSB]

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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