How to Measure Current with CR3110-300 Sensor and Multimeter—No Reading Issue

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#1 21674925 20 Nov 2015 18:49

ltbbeewal Lu ltbbeewal Lu

Anonymous

Post #1
21674925 20 Nov 2015 18:49

Hello~
Could anyone help my problem? Thank you in advance!

I had a CR3110-300 current sensor. I tried it to monitor the current through my earphone's wire, laptop's charger and lamp's wire, but I didn't obtain any readings from multimeter. I just simply clipped the current sensor onto the objective wire, and then used the two probes to touch the white and black lines' metal ends.

Why I can't get reading? What's wrong?

Thank you.
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#2 21674926 20 Nov 2015 19:53

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21674926 20 Nov 2015 19:53

Hi,

Let's first review what is a current. In simple terms it is a movement of electron charges. Upon testing, did you plug the test equipments? Current can only be measured if there is a movement of electrons, that is you have it connected to a supply. Second, if your using multimeter, you should connect it in series.
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#3 21674927 21 Nov 2015 00:13

ltbbeewal Lu ltbbeewal Lu

Anonymous

Post #3
21674927 21 Nov 2015 00:13

Hi,
the current sensor develops signal up to 10.0 VAC across a
burden resistor.
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#4 21674928 21 Nov 2015 01:55

richard gabric richard gabric

Anonymous

Post #4
21674928 21 Nov 2015 01:55

A current transformer will not work at DC, it will have a narrow frequency response, and low sensitivity(check the data sheet for it). They also only work as advertised with an appropriate load resistor.
Thus you will get no reading at DC, and the earphone currents will be insignificantly small and have a much higher bandwidth than the current transformer,
cheers,
Richard
#5 21674929 21 Nov 2015 12:40

ltbbeewal Lu ltbbeewal Lu

Anonymous

Post #5
21674929 21 Nov 2015 12:40

Hi Richard,
Thanks for your comments. It helps me.
I could get readings now.
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