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MASTECH MS8911-Smart SMD Tester(R/L/C)

Discussion in 'General Electronics Discussion' started by caps, Mar 15, 2019.

  1. caps

    caps

    154
    8
    Jul 29, 2018
    I bought RLC tweezers for measuring SMD components. We know that many components do not have marking values, which makes it difficult to find faulty components in the circuit.
    Tweezers work perfectly according to all specifications.
    Given the relatively low price, it is a very good assistant in amateur and professional practice.
    http://www.mastech-group.com/products.php?cate=104&PNo=78
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,064
    1,822
    Nov 17, 2011
    Without knowing the expected value it is only of limited help measuring a component. Unless it is obviously faulty (e.g. a shorted capacitor or an open resistor) a measurement tells you only so much. Although you should always be aware that measuring a component in-circuit is the second best method. You will measure the parasitic effects of the other connected components, too. If you can, always measure a component detached from the circuit.

    Nevertheless this kind of instrument is really handy it leaves one hand free for whatever you need it for, if only to hold the component to be measured (especially round components have a tendency to roll away from the probes).
     
  3. caps

    caps

    154
    8
    Jul 29, 2018
    Special design of gold-plated probes, confidently holds the components of any configuration.
    Autocalibration saves time and nerves, allowing you not to be distracted by the measurement process.
    There is no need to remove the measured components. Measuring voltage is 100 mV. At this voltage there is no influence of other components.
    Electrolytic capacitor 0,47uF/400v.ESR-31Ohm.
    Very good.
    Resistor SMD 0,02 Ohm.
     

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    Last edited: Mar 15, 2019
  4. caps

    caps

    154
    8
    Jul 29, 2018
    Inductance SMD 0,3uH.
    Very good.
     

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  5. caps

    caps

    154
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    Jul 29, 2018
    Measurement of capacitance,shunted by low-impedance resistors.
    Capacitor 1000uF.Measured capacitance-910uF.
    In parallel .8Ohm.
    In parallel. 4.Ohm.
    Very good. Just super.
    :)
     

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  6. caps

    caps

    154
    8
    Jul 29, 2018
    Film capacitor in the circuit.
    0,22uF.
     

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  7. caps

    caps

    154
    8
    Jul 29, 2018
    Ceramic capacitor 23uF.10kHz.
    ESR 0,00 Ohm.
     

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  8. caps

    caps

    154
    8
    Jul 29, 2018
    Resistor jumper.0,01Ohm.
    Very good.
    Resistor-jumper 0,01Ohm.jpg Resistor jumper 0,01Ohm.jpg
     
  9. caps

    caps

    154
    8
    Jul 29, 2018
    Check the accuracy of capacitance measurement.
    Precision capacitor K71-7 0,25uF 250V 0.5%.
    Very good.
    K71-7 0,25uF 250v 0,5%.jpg K71-7 0,25uF 250v 0,5%.jpg
     
  10. caps

    caps

    154
    8
    Jul 29, 2018
    You can clearly see the advantage of the RLC tweezers over the RCD tweezers when measuring the capacitance of a capacitor that is shunted by other circuit elements.
    Electrolytic capacitor 470uF.
     

    Attached Files:

  11. caps

    caps

    154
    8
    Jul 29, 2018
    Precision resistors SMD DALE 1%.
    0.01Ohm.
    0,02Ohm.
    Very good.
     

    Attached Files:

  12. caps

    caps

    154
    8
    Jul 29, 2018
    Resistor SMD 0,01Ohm.
    LCR Pro1 0,01Ohm.jpg
    Mastech MS8911 0,01Ohm.jpg
     
  13. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,170
    2,686
    Jan 21, 2010
    Nonsense
     
  14. caps

    caps

    154
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    Jul 29, 2018
    Draw a part of the circuit where, in your opinion, the capacitor ESR measurement will be affected by different components at a voltage of 100mV.
     
  15. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,170
    2,686
    Jan 21, 2010
    Place two capacitors in parallel
     
  16. caps

    caps

    154
    8
    Jul 29, 2018
    I do not know what relation the test voltage has to the parallel connection of capacitors. You probably meant the definition of ESR of parallel-connected capacitors.
    The test voltage can influence only when inductors or Schottky diodes are included in the circuit. But these situations have not been investigated by anyone and I have not seen any clear evidence of this.
    Therefore, almost all ESR meters, with rare exceptions, have a test voltage of 100-500 mV.
     
  17. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,170
    2,686
    Jan 21, 2010
    The claim was that at the particular test voltage there is no influence on other components (by which I assume you meant that there is no influence on the reading caused by other components). This is simply false. The low test voltage means that semiconductors in circuit are unlikely to affect the reading (and this is the manufacturers claim). You seem to have extended the claim to any component, and indeed in your reply above (bizzarely) suggest that inductors won't affect readings at low test voltsges. As you note, most ESR meters use a similarly low test voltage, so as far as ESR testing goes the low test voltage is nothing particularly special.
     
  18. caps

    caps

    154
    8
    Jul 29, 2018
    You have completely confused me with your answer. When I said that low voltage does not affect, you said that this is nonsense.
    When I said that the influence of other elements is possible, you say that I have complaints about them.
    Actually, the manufacturers themselves do this, reducing the test voltage to ensure the absence of this influence. Rather, they give a choice of two or three voltages.
    Otherwise, why not use for example a voltage of 1V?
    Smart Tweezers ST5S-BT with Bluetooth and Receiver Stick.
    Test Signal Level: 0.45, 0.9 +/- 5% Vrms
    LCR Pro1.
    3 test voltages – 0.2Vrms, 0.5Vrms, 1.0Vrms
    RLC APPA707.
    Test Signal AC Signal Level:
    600mVrms AC Signal Accuracy: ± 20%
    DC Bias Level: 800mV DC Bias Accuracy: ± 10%
     
    Last edited: May 13, 2019
  19. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,170
    2,686
    Jan 21, 2010
    Ok, simply put, at any voltage the measurement taken in circuit can be affected by other components. A low voltage may prevent some components from exhibiting a large effect, but will have no influence on others.
     
  20. caps

    caps

    154
    8
    Jul 29, 2018
    Very good. Great job.
    Capacitor 10pF.
    10.4pF.
    10,4pF.jpg
    10pF LCR Pro1.jpg
     
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