[PTC resettable Fuses problem]

Sure... but...

We are agree to say, like me, that my fuse with an Ihold: 3.0A shouln't break at 2.7A ?

I will try to contact Bourns for explication. Understand the phenomena.

 

[PTC resettable Fuses problem]

Dear community,

 

I'm playing with PTC resettable fuses and i have some trouble.

In effect, i'm not able to retrieve datasheet caracteristics in real life.

 

My PTC reference : Bourns MF-USML/X Series - MF-USML300/6

Vmax : 6v / Ihold :3.0A / Itrip : 6.0A

My test :

My fuses in serial with 1.7r resistor.

Voltage supply 5.1v >>> Current load about 2.7A.

My result

Each time, after 20-30 sec the fuse break. Second thing, if i try to use it again, the sensibility have been change and break after 2-3sec (same load).

 

My question... Where is my error

tell me more is you have an idea.

[DMM6500 table multimeter and Accuracy]

Dear community,

 

I'm working with a Keithley DMM6500 (table multimeter) and i have some difficulty's to understood the accuracy table on page 9.

My aim is to choose/compare/select resistor with very low value (<100mOhms).

My question, on the first table, page 8. Could you explain me the right accuracy for a 1r range ?

DMM6500.pdf DMM6500_extract.pdf