Hi Ian,
When the range of a current tranformer should be increased from 1A to
10A, the best way is to increase the number of turns of the secondary
winding by a factor 10. This transforms the current down by a factor 10
(not up) in the secondary winding...
I*N has the same value on both sides (ideally/theoretically).
73, Stefan
Am 05.08.2017 11:35, schrieb [email protected]:
Hello Allan
I assume the 10A mod is a matter of increasing the series R with the
meter to around 800k?
I suppose a 3way switch and extra trim pot could be added to preserve
the 1A range too.
Thanks for the note re-shipping Monday.
Look forward to getting the Kit.
73
Ian G4GIR
-----Original Message----- From: Alan Melia
Sent: Friday, August 4, 2017 9:36 PM
To: [email protected] ; [email protected]
Subject: LF: RE:G4HUP aerial current meter
It has just occured to me that the 1A range may not be high enough for
some
of the LF QRO merchants. There is a simple mod which will extend the
range
up to 10A though you should be aware the ferrite core has not been
tested at
this level of RF. These cores are used on mains leads carrying up to
13A so
I think they will be OK.
Thank you to those showing interest, there are a few kits still
available.
Alan
G3NYK
|
