Author Topic: Fuse Already Blown?  (Read 1298 times)

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Offline brocklesTopic starter

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Fuse Already Blown?
« on: February 04, 2023, 02:32:41 pm »
Put an old 87V in series with a 4mA DC source and I got no readout, then realised the meter was in AC(default). I'm pretty sure the fuse wasn;t blown prior to this but maybe mistaken. Is it possible by being in AC that it blew the fuse when it was a DC current? I'm convinced the fuse wasn't blown before.
 

Offline Excavatoree

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Re: Fuse Already Blown?
« Reply #1 on: February 04, 2023, 02:48:28 pm »
I don't see how a 4ma source can blow a .44 ampere fuse, regardless of the setting of the meter.  Even in "off" mode, the fuse can be blown with too much current, but current lower than the fuse's rating won't.

Unless your source is defective or otherwise putting out more than 4 ma.

Are you sure the fuse wasn't blown before?
 
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Offline brocklesTopic starter

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Re: Fuse Already Blown?
« Reply #2 on: February 04, 2023, 02:54:15 pm »
 |O  Opened up the meter to remember I'd taken out the fuse for another meter a few years ago  :palm:

Please can someone delete this post
 
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Offline Excavatoree

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Re: Fuse Already Blown?
« Reply #3 on: February 04, 2023, 03:25:32 pm »
I believe you can delete it.

You were correct, however.  The fuse was not blown, because it wasn't there.
 

Offline themadhippy

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Re: Fuse Already Blown?
« Reply #4 on: February 04, 2023, 03:37:59 pm »
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The fuse was not blown, because it wasn't there.
But how do you know its not blown in its alternative location?
 

Offline Excavatoree

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Re: Fuse Already Blown?
« Reply #5 on: February 04, 2023, 04:59:39 pm »
Quote
The fuse was not blown, because it wasn't there.
But how do you know its not blown in its alternative location?

There are many fuses in many locations - some blown and some not.  How does one know which fuse is for the meter?  Is the the one that was last removed, or the one that will be installed? 
 

Offline extremgear

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Re: Fuse Already Blown?
« Reply #6 on: February 04, 2023, 09:41:08 pm »
Maybe the current was higher than 4ma .
Depending of your supply, if it was set to 4ma with a high voltage and then plugged to the meter the current was probably higher than 4 ma during a short time .
 

Online BillyO

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Re: Fuse Already Blown?
« Reply #7 on: February 04, 2023, 10:06:24 pm »
Maybe the current was higher than 4ma .
Depending of your supply, if it was set to 4ma with a high voltage and then plugged to the meter the current was probably higher than 4 ma during a short time .
The current was 0 the entire time.  There was no fuse in the meter.
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Online tv84

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Re: Fuse Already Blown?
« Reply #8 on: February 04, 2023, 10:17:03 pm »
You should increase your current source in order to overcome that fuse absence!
 
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Online AVGresponding

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Re: Fuse Already Blown?
« Reply #9 on: February 05, 2023, 09:55:03 am »
Quote
The fuse was not blown, because it wasn't there.
But how do you know its not blown in its alternative location?

There are many fuses in many locations - some blown and some not.  How does one know which fuse is for the meter?  Is the the one that was last removed, or the one that will be installed?

Schrödinger's Fuse...   :popcorn:
nuqDaq yuch Dapol?
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Offline Gyro

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Re: Fuse Already Blown?
« Reply #10 on: February 05, 2023, 11:04:04 am »
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Schrödinger's Fuse...   :popcorn:

I don't think Schrödinger considered the 'forgot to put the cat in the box' scenario. :D
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Re: Fuse Already Blown?
« Reply #11 on: February 05, 2023, 01:17:35 pm »
Quote
Schrödinger's Fuse...   :popcorn:

I don't think Schrödinger considered the 'forgot to put the cat in the box' scenario. :D

Maybe he should have!
nuqDaq yuch Dapol?
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Online BillyO

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Re: Fuse Already Blown?
« Reply #12 on: February 05, 2023, 01:41:10 pm »
Bill  (Currently a Siglent fanboy)
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Offline Kean

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Re: Fuse Already Blown?
« Reply #13 on: February 05, 2023, 04:18:02 pm »
You should increase your current source in order to overcome that fuse absence!

I think that upping the current source compliance voltage sufficiently to jump the distance of the missing fuse is the solution  :scared:
 

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Re: Fuse Already Blown?
« Reply #14 on: February 05, 2023, 07:55:21 pm »
nuqDaq yuch Dapol?
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