# 4 wire current measurements using sense +/- wire

**URL:** <https://forum.qoitech.com/t/4-wire-current-measurements-using-sense-wire/336>\
**Category:** Support\
**Created:** [June 17, 2020, 11:01pm UTC](https://forum.qoitech.com/t/4-wire-current-measurements-using-sense-wire/336 "2020-06-17T23:01:19Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![atif](https://avatars.discourse-cdn.com/v4/letter/a/9de053/32.png) [@atif](https://forum.qoitech.com/u/atif)\
**Post date:** [June 17, 2020, 11:01pm UTC](https://forum.qoitech.com/t/4-wire-current-measurements-using-sense-wire/336/1 "2020-06-17T23:01:19Z")

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hi,  
I am interested to do 4 wire current measurements using sense +/- wires. do you have any documentation regarding this?  
where should I connect the sense wires? do I need any kind of resistor?

thank you.

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**Author:** ![bjorn.rosqvist](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/bjorn.rosqvist/32/238_2.png) [@bjorn.rosqvist](https://forum.qoitech.com/u/bjorn.rosqvist)\
**Post date:** [June 18, 2020, 7:59am UTC](https://forum.qoitech.com/t/4-wire-current-measurements-using-sense-wire/336/2 "2020-06-18T07:59:34Z")

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Hi atif and welcome to the forum.

You connect SENSE+ straight to your Device Under Test (DUT) where you have connected Main+ and SENSE- to DUT where you connected Main-.  
No resistors should be involved.  
4-wire measurement is enabled, in Battery profiling, by selecting “Use 4-wire” check-box and in automation/scripting by using the API [enable\_4wire(enable)](https://www.qoitech.com/help/scripting/modules/otii.html#device:enable_4wire)

Best regards,  
Björn

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<div class="post-metadata">

**Author:** ![atif](https://avatars.discourse-cdn.com/v4/letter/a/9de053/32.png) [@atif](https://forum.qoitech.com/u/atif)\
**Post date:** [June 18, 2020, 2:33pm UTC](https://forum.qoitech.com/t/4-wire-current-measurements-using-sense-wire/336/3 "2020-06-18T14:33:38Z")

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Hi Bjorn,  
first of all, thank you for your quick reply.  
with 2 wire I have avg 3.52 uA consumption. while with 4 wire its 6.63 uA.  
why the current consumption is double in 4 wire mode?

please take look in the attached images.

 ![2wire](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/63b35bb31af785adda8af24f5faa855240190065.jpeg) ![4wire](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/bf2928b15f6a2d0bf494a785c2aad85ec0e0fba1.jpeg)

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<div class="post-metadata">

**Author:** ![bjorn.rosqvist](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/bjorn.rosqvist/32/238_2.png) [@bjorn.rosqvist](https://forum.qoitech.com/u/bjorn.rosqvist)\
**Post date:** [June 23, 2020, 12:17pm UTC](https://forum.qoitech.com/t/4-wire-current-measurements-using-sense-wire/336/4 "2020-06-23T12:17:14Z")

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Hi,

When you connect any of the Sense pins, you also connect a load of roughly 1.2Mohm. The increased current consumption comes from this resistive load.

Best regards,  
Björn