Specially LittleFuse KLK-15 as in
This thing is almost certainly blown (ohmmeter shows same reading with or without fuse in circuit)... I'm looking at and looking at it, but can't see any visible indicator.
There is none, right?
Need to remove the fuse from circuit.
VOM on ohms scale. Low ohms, like x1.
Reading of infinity means blown, low ohms (under 10) means fuse is OK.
Typically no such thing as a little pregnant ^h^h^h^h^h^h^h^h bad.
. Christ> Specially LittleFuse KLK-15 as in
You're measuring the circuit? I'm curious why you don't measure the ohms of the fuse.
It shows infinite? How do you know that's not because of some other flaw in the circuit? Yeah, yeah, yeah, it was working before, but that's a conclusion. You have the ohmmeter in your hand and the fuse out of its socket.. Why not measure the fuse?
I've seen blown fuses with no visible indication.
"(PeteCresswell)" wrote in news: snipped-for-privacy@4ax.com:
Correct: No visible indicator. Fuses with transparent bodies or windows do allow visual detection of failure, but even that isn't a dead-certainty,
Do not test the /circuit/, test the /fuse/.
To determine whether or not the fuse is blown, you MUST remove it from the circuit (or at least one leg of it), and check between the fuse terminals with a multimeter set to ohms, A good fuse will show zero ohms. A bad fuse will show considerably higher than zero.
It's actually very easy to test a fuse in circuit. There are three different settings on a DMM that will allow you to do it. Explain it and you get a gold star. It's actually the best way to test BFF, Big Fracking Fuses and those that bolt in. ^_^
TDD
V, ?, ???and the D word. I accidentally learned something again. There are several types of Ds.
? is the last setting to use after V and A. I'm guessing D stands for Dumb-ass. ^_^
TDD
Diode. How would one know if the lack of A is due to the fuse and not another cause?
The Daring Dufas wrote in news:l1lhgd$9j3$ snipped-for-privacy@dont-email.me:
Im afraid I get the lead star, 'cause I don't know.
I'm all ears.
The VD is Voltage Drop. You check across a fuse in energized circuit on the volt scale to see how many volts are dropped across it. If it is close to zero, the fuse is probably good (or the circuit is not closed). If you see full circuit voltage, the fuse is bad.
Hi, With or without fuse in circuit? You are measuring between fuse terminals? If you don't read anything(no voltage read) fuse is OK. If you read voltage fuse is blown.
If D for diode, then C for capacitor.
The indicator fuses I've seen have little windows on them. Example here:
This is not an answer to your quiz, but we used to test BFR (Big Fracking Resistors) by banging them on the edge of the workbench.
These were foot long, 1" diameter ceramic resistors used in LORAN-C transmitters. Before we'd meter them, we'd bang them on the edge of the workbench. These resistors had a habit of getting brittle before they failed. We preferred that they cracked while out of the transmitter rather than when they were in a 15K VDC circuit.
The arc across a cracked resistor makes a lot of noise.
It's possible to read zero volts across a in-circuit fuse that is not blown.
The best fuse tester I have used is a Fluke T3. You can go across a fuse in a circuit and it will automatically show if the fuse is ok by showing continuity or if it blown it will show voltage if there is any voltage above 24 volts. Meters are nice in some cases, but this little tester is almost impossiable to blow as long as the voltage is under 600 volts. Nothing to turn on, turn off , or adjust.
Hi, Of course if the circuit is alive.
They also make an indicating fuse with a metal plunger that pops out when it blows. These are usually used in a holder with a sense rail. The plunger pops out, hits the rail and indicates a blown fuse. (light, beeper or whatever)
Pete:
That's correct. Those cylinder type fuses have no indication if they're blown or not, and the only way to tell is by checking for continuity across them.
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