by "Phil Allison" <philallison@[EMAIL PROTECTED]
>
Apr 28, 2008 at 12:15 PM
"Trevor Wilson"
"Phil Allison"
>>
>> Your figures are completely non-typical.
>
> **If I find some different fuses I will test them.
** There IS a manufacturing problem with your 250mA fuses !!!
I found that some of my stock of low current fuses gave absurdly high
resistance readings too - if tested with a DMM or Bobs ESR meter.
After testing at the rated current, with a current limited PSU, the
fuse's
resistance value returned to normal.
Theory:
Low current fuses are made with resistance wire, not copper or tin wire
as
with higher current types.
Where the wire ends are soldered to the fuse caps, a high resistance joint
can form.
Applying a few volts breaks down whatever corrosion is causing this
resistance.
DMMs etc do not apply enough voltage to have any curative effect.
...... Phil
