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QW-ms305D setting constant current?

Discussion in 'General Electronics Discussion' started by Martaine2005, Jun 10, 2019.

  1. Martaine2005

    Martaine2005

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    603
    May 12, 2015
    Hi all, my son’s friend has bought two qw ms305d psu’s amongst other test gear. They are new. He had a problem not being able to set constant current. My son said “my dad will know”!!. I agreed to go there yesterday (Sunday). Well, I d/l the manual in chinglish. I watched several YT vids. I can’t do it!. Manual says to dial in between 3 and 5 volts then short the output leads while dialing in the required current.
    I couldn’t get voltage to display without turning the current knob slightly. Then I set the V to 4v. I shorted the output leads and the current led displays. I tried to set the CC but nothing. Display stays at 0.00.
    I sheepishly told him to buy better equipment and that I would ask you gents on here. My comment was more embarrassment as I know he can’t afford it being in university with my son. Have you guys got any ideas?.
    I almost gave him my old Maplin psu, but thought better of it

    Thanks Martin
     
  2. Audioguru

    Audioguru

    2,480
    550
    Sep 24, 2016
    Look on You Tube for a test of its current regulation NOT WORKING. The test person contacted the seller Who KNEW ABOUT IT NOT WORKING and gave a refund. Cheeep Chinese Junk!
     
  3. Martaine2005

    Martaine2005

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    May 12, 2015
    Thanks @Audioguru . I will have another look on YT. Hopefully my son’s friend can get a refund too.

    Martin
     
  4. Arouse1973

    Arouse1973 Adam

    5,164
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    Dec 18, 2013
    Hi Martin, it's been a while, hope you are well. Got any pics of these PSUs. Ads
     
  5. Martaine2005

    Martaine2005

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    May 12, 2015
    Hey Ads, been emailing you for decades it seems..
    Yes am well thanks.
    I will ask my son to get some pics on his phone. I will try emailing you aagain later. I am back in the UK now. Keep well and hopefully speak soon.

    Martin
     
  6. Arouse1973

    Arouse1973 Adam

    5,164
    1,077
    Dec 18, 2013
    Hi mate, not been getting any emails. PM me your email and I will respond. Ads
     
  7. Martaine2005

    Martaine2005

    2,229
    603
    May 12, 2015
    Thanks ‘n*t*ack. Will do .
     
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