CA CV power supply Voltage output

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Dc power supply

Asher @chillsmaker

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Posted: Mar 27, 2017

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CA CV power supply Voltage output

Hi,

Recently I ordered a power supply 30 volts 5 amps.

I wanted to test the voltage with a voltmeter so if I put it on 5 volts the voltmeter starts at about 6.5 volts and just keeps going up little by little.

So I figured it's defective, I ordered another one from another company different model and it seems to be doing the same thing.

Any input on this anybody?

Here are the units I'm talking about. Thank you in advance.

Answered! View the answer I have this problem too

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@chillsmaker I am a bit confused by that. It is a variable voltage supply? Multiple settings? You are using an external voltmeter to measure the output? Which voltmeter starts a 6.5V?

Mar 27, 2017 by oldturkey03

They are Variable Adjustable. So lets say I set the Power Supply to output 5V and I measure it with a voltmeter...the measuring volt meter measures 6.5V and it keeps going up slowly to about 8-9 Volts.

Mar 28, 2017 by Asher

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Minho @refectio

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Refectio - Mail-in Micro-Soldering Repairs & Data Recovery

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Posted: Mar 28, 2017

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You will need to isolate a variable here. Either your PS is drifting or your voltmeter.

If you set your PS to 5V, does the reading on the display of the PS drift similarly to the display of the voltmeter? If it does you should return your PS under warranty.

If you measure a known voltage source, such as a 9V battery or 3 X AA batteries, does the measured voltage on your volt meter drift? If it does, then you volt meter is defective and needs to be replaced.

Can you post a picture of your voltmeter. There are many poor quality meters on the market.

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The display on PS does not change, only on the voltmeter. I'll try to post pictures a bit later today.

Mar 28, 2017 by Asher

I updated the question with the pictures.

Mar 28, 2017 by Asher

Thanks for the update. As I said before, measure another known voltage source, such as a battery to see if the voltmeter does the same thing or not.

Mar 28, 2017 by Minho

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@chillsmaker I am a bit confused by that. It is a variable voltage supply? Multiple settings? You are using an external voltmeter to measure the output? Which voltmeter starts a 6.5V? — oldturkey03
They are Variable Adjustable. So lets say I set the Power Supply to output 5V and I measure it with a voltmeter...the measuring volt meter measures 6.5V and it keeps going up slowly to about 8-9 Volts. — Asher
The display on PS does not change, only on the voltmeter. I'll try to post pictures a bit later today. — Asher
Thanks for the update. As I said before, measure another known voltage source, such as a battery to see if the voltmeter does the same thing or not. — Minho