# OTII voltage regulator broken?

**URL:** <https://forum.qoitech.com/t/otii-voltage-regulator-broken/387>\
**Category:** Arc/Ace Pro\
**Created:** [September 3, 2021, 1:27pm UTC](https://forum.qoitech.com/t/otii-voltage-regulator-broken/387 "2021-09-03T13:27:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![angelicacz](https://avatars.discourse-cdn.com/v4/letter/a/2bfe46/32.png) [@angelicacz](https://forum.qoitech.com/u/angelicacz)\
**Post date:** [September 3, 2021, 1:27pm UTC](https://forum.qoitech.com/t/otii-voltage-regulator-broken/387/1 "2021-09-03T13:27:00Z")

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Hi,

I have been performing measurements with OTII HW version 1.3 and firmware version 1.1.5.  
The DUT has a supply voltage of 3.6V. I have seen higher voltage drops (up to 1V drop) than expected:

 ![image](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/d1ec326932643ada56d5c7280bf0c3d654d61b6b.png)

I have measured by powering up the OTII by the PC and/or 9V power supply, and I obtained same results for either of these cases.

When measuring same DUT using diifferent OTII device, the voltage drops are much lower (up to 0.18V drop):

 ![image](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/e4dfbc58dbd506819436e61d5fdeed9982910e00.png)

Could it be that the voltage regulator of the OTII is damaged?

Thank you.  
Best regards,

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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:** [September 6, 2021, 6:15am UTC](https://forum.qoitech.com/t/otii-voltage-regulator-broken/387/2 "2021-09-06T06:15:04Z")

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Hi and welcome to the forum.

It looks like you have turned on the internal resistance function.  
Could you create a [case](https://www.qoitech.com/cases/), please, and I will send you a test script.

Best regards,  
Björn

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<div class="post-metadata">

**Author:** ![angelicacz](https://avatars.discourse-cdn.com/v4/letter/a/2bfe46/32.png) [@angelicacz](https://forum.qoitech.com/u/angelicacz)\
**Post date:** [September 6, 2021, 8:01am UTC](https://forum.qoitech.com/t/otii-voltage-regulator-broken/387/3 "2021-09-06T08:01:03Z")

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Hi Björn,

Thank you for your reply!  
I just created the case.

Thank you.  
Best regards,  
Angelica