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DT9205A multimeter fault in voltages measurements

Discussion in 'General Electronics Discussion' started by Technician Tonny, Aug 31, 2015.

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  1. Technician Tonny

    Technician Tonny

    34
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    Aug 31, 2015
    Hello Technicians
    I'm Tonny, I need your help plz
    I have 3 digital multimeter DT9205A with the same problems
    They can't display measurements of DC and AC
    Thanks
     
  2. Old Steve

    Old Steve

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    Jul 23, 2015
    Did you put a battery in it?
     
    Technician Tonny likes this.
  3. shrtrnd

    shrtrnd

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    Jan 15, 2010
    Don't know your exact problem, like, are you at least seeing zeros in the display, or a dead display.
    Most multimeters have two fuses. One for the voltage meansurements, and one for the amp readings.
    Did you check the fuses?
     
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  4. Old Steve

    Old Steve

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    Jul 23, 2015
    That model only has a fuse in the current measurement circuitry, according to the manual. Just the lower current ranges, too, not the 20A range.
    The manual:-
    https://arduino-info.wikispaces.com/dt9205a-multimeter-manual
     
  5. shrtrnd

    shrtrnd

    3,712
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    Jan 15, 2010
    Well, the only other DMM I ever saw that had a current-side only fuse, used a big resistor designed to fuse open-circuit at over-voltage of the meter.
    Thanks for the info Old Steve.
    My advice then to Technician Tonny, is to open the meter housng, and look for bruned-up components.
     
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  6. Technician Tonny

    Technician Tonny

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    Aug 31, 2015
     
  7. Technician Tonny

    Technician Tonny

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    Aug 31, 2015
    yes Steve
    This problem occurred when i was measuring the B+ of the CRT tv circuit
     
  8. Old Steve

    Old Steve

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    Jul 23, 2015
    I didn't mean to sound rude, but since you didn't mention if it was new or previously used, I thought I'd better ask about the battery.
    The B+ voltage itself on a CRT TV isn't usually a particularly high voltage and the DMM should have been able to handle it, I would think. Most likely, it got a zap of HV from the flyback transformer. In that case, it is probably dead.
    If I were you, I wouldn't waste further time trying to fix it. It's a relatively cheap meter. I'd just replace it, personally.
    Edit: I just re-checked the manual, and on the DCV ranges it should be able to handle 1000VDC. Even if you had it set on the wrong range, below 200VDC, it should have just displayed an over-range symbol, so HV almost certainly killed it. You could look for burned components as suggested by shrtrnd, but aside from that I'd recommend that you simply replace it as I suggested earlier. Sorry I can't be of further help.
     
    Last edited: Sep 1, 2015
    Technician Tonny likes this.
  9. Technician Tonny

    Technician Tonny

    34
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    Aug 31, 2015
    shrtrnd I see only 1 fuse and 3 ICS
    I have changed the lm358, lm324 and the near by components
    But still the same problem
     
  10. Technician Tonny

    Technician Tonny

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    Aug 31, 2015
    Ohk thanks Steve
    nice day
     
  11. Old Steve

    Old Steve

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    Jul 23, 2015
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  12. Technician Tonny

    Technician Tonny

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    Aug 31, 2015
    Thanks Steve for that information
     
  13. Old Steve

    Old Steve

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    Jul 23, 2015
    I hope it helps. I even considered buying one from here in Australia and sending it to you, but postage from here to Uganda is AUD$25, almost twice as much as the DMM itself.
    (USD$8.99 = AUD$12.59)
     
    Last edited: Sep 1, 2015
    Technician Tonny and (*steve*) like this.
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