# how to use current transducer

Discussion in 'General Electronics Chat' started by thehaders, Mar 6, 2009.

Nov 14, 2008
6
0
Hi all,

I bought a current transducer for measuring the current that goes into my dc motor. I have the datasheet but not really sure how to use it. Can anyone help me please?

The current range that I am measuring is 0-2A. The link is for the datasheet is below. The current transducer that I bought is HX 03-P/SP2. Any comment, typical application circuit, anything at all are welcomed.

http://www.datasheetcatalog.org/datasheet/lem/HX15-P_SP2.pdf

Thank you very much.

2. ### russ_hensel AAC Fanatic!

Jan 11, 2009
825
57
Do not buy something unless you have a circuit for it. Even if the circuit is available it may not be suitable. I can find no application notes for this. Just the spec sheet. The part that you need to go on is:

ns subject to change without notice.
Terminal Pin Identification
1.....0V
2.....0V
3.....+12V to +15V
4.....Output
5.....Primary input Current(+)
6.....Primary input Current(-)

and the note that: VOUT Output voltage @ ± I
PN, RL
= 2 kW, TA = 25°C VOE
±0.625 V

3. ### BillB3857 AAC Fanatic!

Feb 28, 2009
2,493
389

Nov 14, 2008
6
0
I noticed that. Does it mean it gives me output voltage which proportional to the current. Well, of course V=IR, but i was expecting it gives me value of current not the output voltage.

Anyhow, do you have any suggestion of particular current sensor/current transducer that is easy and relatively simple to use. All I need is just the actual current from the dc motor so that I can feed that current into my PI controller and compare it with the reference current.

Thank you very much.

5. ### BillB3857 AAC Fanatic!

Feb 28, 2009
2,493
389
There are a lot of commercial SCR based DC drives that simply use high wattage resistors in the range of from 0.1 (1/10) to 0.5 (5/10) ohm to monitor motor current. These resistors would go in series with the motor load. One end would be tied to ground so the voltage developed would be ground referenced. They typically use an op amp to amplify the small voltage derveloped by the shunt to a more usable value. If you go to