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Drok SKU:180081 2016-07-19T18:23:58+00:00

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  • Gary Hetrick
    July 19, 2016 at 6:23 pm
    Post count: 0
    #6531 Reply |

    Hello, I just purchased your Numerical Control Step Down Voltage Regulator Stabilizer, DC 6-55V to 0-50V 5A Constant Voltage Current Buck Power Converter Voltage Transformer SKU:180081 from Amazon. I connected the unit to a 12 vdc supply and the screen did not come on. I checked my connections and metered my source, everything is hooked up as marked. Any help would be appreciated.
    Thanks.

    Drok
    Keymaster
    July 20, 2016 at 2:09 am
    Post count: 2971
    #6539 Reply |

    Hello Gary Hetrick，
    Thank you for writing in.
    Have you check if the power supply supplies power normally and the terminals are well connected or not?
    Could you please try to move the connecting terminals to see if they are well connected or not?
    If the power supply is normal and the terminals are well connected but the product still cannot work, please feel free to write back to us.
    Best regards

    Gary Hetrick
    July 21, 2016 at 6:03 pm
    Post count: 0
    #6563 Reply |

    I tried what you suggested and it still didn’t work. I took it over to a friends house and hooked it up to his bench power supply and still nothing.

    Drok
    Keymaster
    July 22, 2016 at 8:18 am
    Post count: 2971
    #6573 Reply |

    Hello Gary Hetrick,
    Thank you for your reply.
    Could you please send us some images to let us check the problem details?
    With your help, we can find a solution more quickly.
    You can send the images to us by email (service at droking dot com).
    Waiting for your reply.
    Best regards

    Alan Fiebig
    October 25, 2016 at 9:43 pm
    Post count: 0
    #10018 Reply |

    Just got the DROK Numerical Control model 180081.
    I have figured out everything except how to put in cobstant current (CC) mode.

    I set the voltage to 10 volts and the current to 0.005, then connected the output to a 1k resistor, whish at 10 volts should pull 0.010 amps.

    I do indeed see that I have 10 volts across the resistor and 0.010 amps is flowing.
    But, as I have the output current set for 0.005, I would expect to see the voltage drop below 10 volts and the current never go above 0.005 amps.

    That is how constant current should work. But the symbol on the right side of the screen show “CV” and not “CC”.

    How do I place it in constant current mode? That is what I bought it for.

    Thanks.

    Drok
    Keymaster
    October 26, 2016 at 7:34 am
    Post count: 2971
    #10034 Reply |

    Hello Alan Fiebig,
    Thank you for writing in.
    Could you please send some images of your wiring and the display of the product to let us check the problem details?
    And since the current you used to test is very small which will caused deviation, please test the CC function of the product with larger current.
    With your help, we can find a solution more quickly.
    Looking forward to hearing from you.
    Best regards

    Alan Fiebig
    October 26, 2016 at 4:38 pm
    Post count: 0
    #10041 Reply |

    Yes, I see that at higher currents, your device properly holds to the desired current.
    However, that is not what I purchased it for. My application requires a maximum of 5ma. And your advertised specifications indicate that is within your products capabilities.

    I need to be able to dial in 5ma on your unit, and have it maintain that as the maximum current, and not go over it. What use is a .001A – .010A setting if it is ignored?

    -Alan

    Drok
    Keymaster
    October 27, 2016 at 1:59 am
    Post count: 2971
    #10058 Reply |

    Hello Alan Fiebig,
    Thank you for your reply.
    Do you mean the CC function of the product work normally when it is at high current?
    Could you please send us some images of the display of the product when you set the output current to 5ma to let us check the problem details?
    Beg your understanding.
    Best regards

    Alan Fiebig
    October 28, 2016 at 10:16 pm
    Post count: 0
    #10107 Reply |

    Here you go.
    Set for 10 volts @ 5ma.
    Yet it is outputting 10ma.

    Panel view 1
    Panel view 2

    Alan Fiebig
    October 28, 2016 at 10:20 pm
    Post count: 0
    #10108 Reply |

    And it is in “CV” mode, not “CC”, even though it is at almost twice the set current.

    Drok
    Keymaster
    October 29, 2016 at 2:28 am
    Post count: 2971
    #10112 Reply |

    Hello Alan Fiebig,
    Thank you for your cooperation.
    This problem may be caused by the error.
    Generally, the error of this product is 3ma.
    Could you please try to reduce the set current gradually to see if the product enter into CC mode?
    If yes, please tell us the set current when the product enter into the CC mode.
    Waiting for your reply.
    Best regards

    Alan Fiebig
    October 29, 2016 at 2:06 pm
    Post count: 0
    #10122 Reply |

    It switched over to ‘cc’ at 3ma.
    However, it was still outputting twice that, 6ma.
    panel 3

    Drok
    Keymaster
    October 31, 2016 at 1:45 am
    Post count: 2971
    #10135 Reply |

    Hello Alan Fiebig,
    Thank you for your continue patience on this matter.
    According to your description. this problem may be caused by the error of this product.
    Since the set current value in your application is very small, so the error ratio become larger.
    The output current measurement accuracy is ±(0.5% + 2 digits).
    It is better that you can use a multimeter with higher accuracy to check the value of the output current.
    And for this ratio, if you need 5ma output current, please try to set the output current value to 2.5ma to see if it can output 5ma and enter into CC mode.
    Best regards

    Alan Fiebig
    October 31, 2016 at 4:50 pm
    Post count: 0
    #10150 Reply |

    Thank you for your reply.
    I have verified the output with a high accuracy voltmeter, and the measured output on the device display, both voltage and current, is very very close to that measured on my voltmeter. So it is not a measurement inaccuracy, but rather a control inaccuracy.

    On a positive note, if I turn down the voltage setting, the current also comes down, and the value it comes down to is constant and usable for my application. The displayed output voltage and current on your device reflects my desired output (10V @ 5ma), it is just that the setpoints for both voltage and current do not match the actual output.

    I can live with this. I would suggest that you add the device’s accuracy to the description on both your Amazon listing and the web page for the device so that people like myself would know this up front:

    “The output current measurement accuracy is ±(0.5% + 2 digits).”

    Thanks again,
    -Alan

    Drok
    Keymaster
    November 1, 2016 at 3:06 am
    Post count: 2971
    #10162 Reply |

    Hello Alan Fiebig,
    Thank you for your valuable suggestion.
    We are trying our best to improve our product.
    Your valuable suggestion would be very helpful in our improving.
    Great thanks for bringing this matter to our attention.
    Best regards

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