What equpment can be used to time a quick blow fuse

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SUMMARY

The discussion focuses on measuring the time it takes for a "quick blow" fuse to blow when the current exceeds a predetermined threshold. Participants suggest using an oscilloscope connected across the fuse to observe the current versus time (I/t) graph, which allows for precise measurement of the blow time. A handheld stopwatch is mentioned as a less accurate alternative, requiring manual timing and adjustment for human reaction time. The oscilloscope method provides a more reliable and immediate measurement of the fuse's performance.

PREREQUISITES
  • Understanding of electrical circuits and fuse operation
  • Familiarity with oscilloscope usage and interpretation of I/t graphs
  • Basic knowledge of current measurement techniques
  • Ability to calculate time intervals in milliseconds
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  • Research how to set up an oscilloscope for current measurement
  • Learn about different types of fuses and their characteristics
  • Explore methods for calculating time intervals accurately in electrical experiments
  • Investigate safety protocols when working with high current circuits
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Electrical engineers, lab technicians, and students involved in circuit design and testing, particularly those focusing on fuse performance and timing measurements.

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What equpment can be used to time a "quick blow" fuse

Hi everyone,
I just received a planning and design lab that requries me to measure the time taken to for a "quick blow" fuse to blow when the current in the equipment it is in, rises above the predetermined point. The times being dealt with are in milliseconds and so I have no idea what basic lab equipment can be used to measure these kinds of times. Any suggestions would be greatly appreciated.

so far all I could come up with is a normal hand held stop watch that should be started when the current reaches the maximum current that the equipment could handle and stopped when the courrent reaches zero. The reaction time of the person doing the timing should be deducted from the results.
 
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Hi,

You can just connect a scope across the fuse. Observe the I/t graph on the scope and when the fuse blows the current on the scope will drop to zero. Just calculte how how it was before the current went to zero.
 

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