April 12, 2020, 3:22 pm
A fuse is a sacrificial device for the protection the rest of the circuit in an over-current situation. There are situations we need to know with some reasonable confidence what the actual maximum current is for a given fuse without destroying it. This is beneficial when the specifications for the fuse at hand is unknown (e.g. with cheap no-name brand fuse), or the circuitry to be protected is so critical that the interrupt current level must be specified precisely.
Continue reading ‘Non-destructive Testing of Fuses’ »
Tags:
Array 3711A,
BK Precision 2709B,
Constant Current,
Electronic Load,
Experiment,
Fuse,
HRC Fuse,
Melting Integral,
Non-destructive Testing,
Polymetric PTC,
PPTC,
PTC,
Resettable Fuse,
Temperature Coefficient Category:
Electronics |
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June 10, 2018, 10:59 am
Recently I got hold of a dead APC SurgeArrest power strip that was about to be thrown out in my office. The power strip simply doesn’t provide power to any of its outlets regardless of the power switch position. Since there was no external fuse that I could find, I decided to take it apart and find out why and how it had failed. Continue reading ‘Unusual Failure Mode of an APC Surge Protector’ »
Tags:
APC,
CPSC,
Darlington,
Fuse,
MOV,
MSPA13,
NET7,
PN2222A,
Recall,
Surge Protector,
Teardown,
Varistor Category:
Electronics |
2 Comments