I need to replace a transformer that the part number is WTI-8330. I need to
know what the primary and secondary impedance is and dc resistance. I've
tried to search thru Google but didn't get any hits

Barry Streets wrote:

I need to replace a transformer that the part number is WTI-8330. I need to
know what the primary and secondary impedance is and dc resistance. I've
tried to search thru Google but didn't get any hits

Insufficient info.

Might help if you mentioned the equipment it's used in - and the application.

Likely no longer available - but might be able to suggest an alternative if you
post enough info.


Graham

The Application is a party line audio intercom that has 20 to 30 stations,
phantomed powered over the balanced audio lines. It's the transformer that
drives the balanced line, and the center-tap is used to extract the dc
power. Hope this helps as the system was custom built 20-30 years ago.


"Pooh Bear" wrote in message
...


Barry Streets wrote:

I need to replace a transformer that the part number is WTI-8330. I need
to
know what the primary and secondary impedance is and dc resistance. I've
tried to search thru Google but didn't get any hits

Insufficient info.

Might help if you mentioned the equipment it's used in - and the
application.

Likely no longer available - but might be able to suggest an alternative
if you
post enough info.


Graham

"Barry Streets" writes:

I need to replace a transformer that the part number is WTI-8330. I need to
know what the primary and secondary impedance is and dc resistance. I've
tried to search thru Google but didn't get any hits

Do you have an equipment where you have a working identical
transformer ?
If you have that and some measuring equipment, you can measure
the DC resistances from it. And when you measure inductances
with RLC meter and look at the circuit the transformer is put to,
you usually get idea of the impdances and turns ratios.

--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/

"Barry Streets" wrote in message
news:PwAkd.393209$D%.27527@attbi_s51

The Application is a party line audio intercom that has 20 to 30
stations, phantomed powered over the balanced audio lines. It's the
transformer that drives the balanced line, and the center-tap is used
to extract the dc power. Hope this helps as the system was custom
built 20-30 years ago.

So measure one of the other 19 to 29 transformers that still work.

Measure DC resistance of the windings with an ohm meter.

Measure turns ratio by applying a small audio voltage to one winding and
measuring the voltage across the other winding(s).

If you want to be fancy, you can use a scope and a higher-powered signal
source to find out what levels it takes to saturate the cores.