Fuse or fusible resistor?

[Tim Williams]

"DaveC" <invalid@invalid.net> wrote in message news:0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org...

Used in the battery (-) lead of a handheld scope. Schematics unpublished.

Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
"1E7A".

Obviously, it's 10,000,000 amperes ;^)

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

 

[Jamie]

Tim Williams wrote:

"DaveC" <invalid@invalid.net> wrote in message news:0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org...

Used in the battery (-) lead of a handheld scope. Schematics unpublished.

Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
"1E7A".


Obviously, it's 10,000,000 amperes ;^)

Tim

good one

 

[James Sweet]

I take it , that its blown and I also take it that its not charred (fusible
R don't char or even discolour AFAIK)
Desolder it and scrape an axial line along its length . Then DVM resistance
check from either end. If a fusible resistor then maximum R read is what its
value was near enough.
FR breaks are usually to one end, normal R usually in the middle.
Although green is often axial inductor.

--

They won't catch fire but I have seen them char slightly. It's also
common for them to crack or blow out a small chip of ceramic if
something shorts and exposes them directly to the line voltage.

 

[fly on the wall]

On Sun, 27 Jun 2010 00:27:45 -0700, DaveC <invalid@invalid.net> wrote:

I take it , that its blown and I also take it that its not charred (fusible
R don't char or even discolour AFAIK)

No, I don't have one. I threw it out with the old battery. :-(
Someone on-line volunteered to describe the one from his scope.
I'll not ask him to do a post-mortem on a working fuse. ;-)

Surely (s)he can MEASURE the one (s)he has?