# Is it valid to measure the voltage of a psu using a wall power monitor

**URL:** <https://klipper.discourse.group/t/is-it-valid-to-measure-the-voltage-of-a-psu-using-a-wall-power-monitor/7325>\
**Category:** General Discussion\
**Created:** [March 18, 2023, 3:52am UTC](https://klipper.discourse.group/t/is-it-valid-to-measure-the-voltage-of-a-psu-using-a-wall-power-monitor/7325 "2023-03-18T03:52:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![peter1](https://avatars.discourse-cdn.com/v4/letter/p/a587f6/32.png) [@peter1](https://klipper.discourse.group/u/peter1)\
**Post date:** [March 18, 2023, 3:52am UTC](https://klipper.discourse.group/t/is-it-valid-to-measure-the-voltage-of-a-psu-using-a-wall-power-monitor/7325/1 "2023-03-18T03:52:21Z")

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Trying to figure out if the psu’s I bought from comgrows amazon return bin are actually 24 volts. By using a wall outlet wattage monitor and the hold\_current value its appears to be in the 12 volt range. Is this a valid method to verify voltage for a psu or am I missing something.

Maths: tmc5160 hold\_current:1, 4 active stepper motors idling with power, wall outlet says 35 watts, should be around 90 watts… I think.

Reason: Building a heavy high speed printer and before I go back to the design board want to make sure of the root cause.

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**Author:** ![jakep\_82](https://avatars.discourse-cdn.com/v4/letter/j/ea666f/32.png) [@jakep\_82](https://klipper.discourse.group/u/jakep_82)\
**Post date:** [March 18, 2023, 4:09am UTC](https://klipper.discourse.group/t/is-it-valid-to-measure-the-voltage-of-a-psu-using-a-wall-power-monitor/7325/2 "2023-03-18T04:09:17Z")

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No, this is not a valid way to measure output voltage on a PSU. You need a multimeter.

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**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\
**Post date:** [March 18, 2023, 3:03pm UTC](https://klipper.discourse.group/t/is-it-valid-to-measure-the-voltage-of-a-psu-using-a-wall-power-monitor/7325/3 "2023-03-18T15:03:16Z")

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> [@peter1](#):
>
> Trying to figure out if the psu’s I bought from comgrows amazon return bin are actually 24 volts. By using a wall outlet wattage monitor and the hold\_current value its appears to be in the 12 volt range. Is this a valid method to verify voltage for a psu or am I missing something.

What do you want to measure? I agree with jakep\_82

> [@peter1](#):
>
> Maths: tmc5160 hold\_current:1, 4 active stepper motors idling with power, wall outlet says 35 watts, should be around 90 watts… I think.

“Maths” What do you mean by that?

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**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [September 8, 2023, 8:03pm UTC](https://klipper.discourse.group/t/is-it-valid-to-measure-the-voltage-of-a-psu-using-a-wall-power-monitor/7325/4 "2023-09-08T20:03:23Z")

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