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TA189 minimum mA reading?

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TA189 minimum mA reading?

Postby jpasint » Mon Mar 14, 2016 9:48 pm

Hi,

I am looking to find out what the minimum mA reading that the TA189 is capable of.
I would like to trace the current draw on a discharge cycle of a 3.7 volt 18650 battery.

The discharger will drop the load to a few mA as the battery voltage drops close to 3.2 volt stop point so I am wondering how low of a reading one could expect with the TA189.

Thanks in advance.

Joe
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Re: TA189 minimum mA reading?

Postby jpasint » Thu Mar 17, 2016 4:21 pm

I received a reply from my question above but I do not see it in the forum here for some reason.
I understand now that the TA018 would be better for my needs.

Can I ask what the significant differences are and why there is such a big price difference between the TA189 and the TA018?

Again, thank you in advance.
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Re: TA189 minimum mA reading?

Postby AndrewA » Wed Mar 23, 2016 11:51 am

Hello Joe,

What was the reason that TA018 was better than the TA189. I would say the TA018 would actual be worse, for low mA readings.

Accuracy-
TA189 ± 1% of reading ± 2 mA
TA018 ± 1.5% of reading ± 5 mA

The cost difference is due to the TA189 having better performance and accuracy.

If you are using one these clamps, I would wrap say 10 turns of the conductor around the clamp. Then divide the reading by the number of turns, this will give a better accuracy as you are measuring a higher current.

If you need better accuracy I would look buying one these to use with a scope or meter-
http://www.eevblog.com/projects/ucurrent/
Regards Andrew
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Re: TA189 minimum mA reading?

Postby jpasint » Thu Mar 24, 2016 3:37 pm

Hi Andrew and thanks for posting here.
Well, I received an email from a support rep. That is the reason for post above regarding the TA018.
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Re: TA189 minimum mA reading?

Postby Martyn » Sat Mar 26, 2016 10:26 am

The information you were given by the support rep was incorrect, which is why the post was deleted, he is a new member of the team and misunderstood the specifications. I have also removed the text from your email so as not to confuse others.
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Re: TA189 minimum mA reading?

Postby jpasint » Sat Mar 26, 2016 11:20 am

Thanks Martyn.
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