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Fuse or fusible resistor?

D

DaveC

Jan 1, 1970
0
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 Schematics unpublished.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".

Google returns slim results, none promising.

What type is this?

Thanks,
Dave
 
P

Pieyed Piper

Jan 1, 1970
0
Idiot
^^^^^ Not a complete sentence
^^^^^^^^^^^^^^^^^^^^^^^ Not a complete sentence

Etc.

John

I should have figured that not a goddamned soul actually tried to answer
the question.

It sounds like a 'soft-fuze'. That resets itself after tripping.

There is also a similar device used in hair dryer circuitry.
 
P

Phil Allison

Jan 1, 1970
0
"DaveC" <
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 Schematics unpublished.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".


** Sounds like a Pico Fuse:

http://media.digikey.com/photos/Littelfuse Photos/PICO II R251 SERIES.jpg

Come in fast and very fast ratings with amps rated from 1A to about 15A.

When they blow, you need a soldering iron to replace them.

There are various Asians clones too.


...... Phil
 
P

Phil Allison

Jan 1, 1970
0
"DaveC"
Physically similar to a 1/4 W resistor, color light green. Marked "IE7A"
or
"1E7A".


** Sure that is not the other way around ?

Pico Fuse would use " 7A LE " as a the marking for a 7 amp fuse.



..... Phil
 
N

N_Cook

Jan 1, 1970
0
DaveC said:
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 Schematics unpublished.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".

Google returns slim results, none promising.

What type is this?

Thanks,
Dave


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.
 
K

Kevin McMurtrie

Jan 1, 1970
0
DaveC said:
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 Schematics unpublished.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".

Google returns slim results, none promising.

What type is this?

Thanks,
Dave

Littlefuse makes green resistor-shaped fuses. Their logo is an 'L'
wrapped under an 'F' so their 'LF' could look like 'IE' on a worn part.

http://www.littelfuse.com/data/en/Data_Sheets/Littelfuse_251_253.pdf
 
D

DaveC

Jan 1, 1970
0
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. ;-)

Thanks,
Dave
 
P

Pieyed Piper

Jan 1, 1970
0
Fuse.
Ratings of these beasts in equipment is almost NEVER disclosed - like
a company secret more precious than any other secret they have.
Measure current draw and see what the maximum is during any
operations, double that for a guide in choosing "first guess" replacement.

The axial leaded jobs I have seen in hair dryers are high current jobs
with reed switches inside them. Not the soft break jobs.

The biggest soft device I recall was 3 Amps.
 
P

Pieyed Piper

Jan 1, 1970
0
Could that be because no one knew what tghe question was?

If you cannot glean the question from that, you are not only too
goddamned retarded to be answering it, you are too goddamned retarded to
be in the group at all, much less being here, acting like you have half a
fucking brain.

Nice sig, dumbfuck. It fits you perfectly.
 
F

Fester Bestertester

Jan 1, 1970
0
Ratings of these beasts in equipment is almost NEVER disclosed - like
a company secret more precious than any other secret they have.

And that's why markings are so important. You can circumvent any need to
measure.
 
A

Arfa Daily

Jan 1, 1970
0
Salmon Egg said:
USE COMPLETE SENTENCES!

They are complete s

Just not ones that you

What I am writing, are incomplete sen

And don't

We don't like that on sci

Arf
 
T

Tim Williams

Jan 1, 1970
0
DaveC said:
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
 
J

James Sweet

Jan 1, 1970
0
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.
 
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