Re: Testing NST with an auto-ranging meter

[Terry Fritz <twftesla-at-xxxxxxxxxx>]

Hi Seth,

As the meter searches for the range, it switches different currents and
jumps around looking for the right range.  However, the giant inductance of
the primary is probably playing havoc with that circuit and making it not
lock.  If you can lock the range on that meter and search manually (about
10k ohms) it should work.

Cheers,

	Terry

At 08:20 PM 11/13/2000 +1300, you wrote:
>I have a second hand 15/30 NST
>
>Both have a primary resistance of 3.0 Ohms.
>
>Each output terminal to case is 8.0k Ohm.
>
>But when I try to measure the output resistance, terminal to terminal my
>Fluke 77 digital meter can't select the correct range I must manually
>set the range to k Ohm to get a reading of 16k Ohm.
>
>Anyone know why?
>
>
>
>I think my other NST I bought is dead 8.0k Ohm terminal to case and o/c
>the other terminal to case. Is it usual for only one winding blow? I
>can't get the cover off because black stuff has oozed out.
>
>I guess I'm safe to ask for a replacement.
>
>
>Thanks,
>Seth Fischer
>