logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Using a Multimeter to Measure Battery Capacity and Check Diodes: A How-To Guide

kieraso341 33390 10
Best answers LABEL_AI_GENERATED

How can I measure a battery’s capacity with a multimeter, and can I use the same meter to check a diode?

A multimeter cannot measure battery capacity directly; you need a known load and must measure how long the battery lasts until its voltage falls to the discharged limit [#16343417][#16343414] For an AA battery, the thread suggests briefly testing short-circuit current on the 10A or 20A range, and a short-circuit current above 3A was mentioned as a sign the battery is in good condition [#16343495] A resistor or light bulb can be used as the load for a capacity test, but this also discharges the battery [#16343414] Do not do the short-circuit test on a phone battery because it can be destroyed [#16343495] If you are measuring car battery charging current, use the DC current range set to 10A and plug the red lead into the 10A socket, not the voltage range [#16343503][#16343506] The replies do not provide a diode-checking procedure.
AI summary based on the discussion. May contain errors.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #1 16343329
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    Hello, is it going to measure the battery capacity with a multimeter? How to do it? Does it go to check the diode with a multimeter?
  • ADVERTISEMENT
  • #2 16343345
    rafbid
    Level 33  
    Posts: 2450
    Help: 153
    Rate: 418
    And what is the battery?
  • #3 16343388
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    I mean standard AA batteries or batteries from the phone.
  • ADVERTISEMENT
  • #4 16343399
    kkknc
    Level 43  
    Posts: 23787
    Help: 1916
    Rate: 6722
    Using mA, we expect the rest of Ochma's law.

    Moderated By dondu:

    Skipping the typo in which Ohm in the grave falls over, the friend wants to damage the multimeter asking or at least a fuse!

    Warning for repentance, in particular advising in the beginners department.

  • #5 16343402
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    Because I just turned on the mA mode and nothing shows.
  • ADVERTISEMENT
  • #6 16343414
    kkknc
    Level 43  
    Posts: 23787
    Help: 1916
    Rate: 6722
    Turn on a series with a resistor or a light bulb. And count to the final voltage. Of course, you will unload the battery.
  • #7 16343417
    rafbid
    Level 33  
    Posts: 2450
    Help: 153
    Rate: 418
    You need a receiver with a known power consumption and you need to measure the time until the voltage on the battery drops to the voltage at which the batteries are considered discharged.
    kieraso341 wrote:
    Because I just turned on the mA mode and nothing shows.
    Check the fuse in the meter.
  • #8 16343484
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    OK I understand. I have one more question, whether to measure the battery charging current in the car with an automatic meter, simply connect the black lead to com red to vmA and set the range on the voltage constantly? Does the red wire need to be connected to the 10A socket?

  • AA battery short-current test and phone-battery warning

    #9 16343495
    vodiczka
    Level 43  
    Posts: 30285
    Help: 1185
    Rate: 4311
    kieraso341 wrote:
    Because I just turned on the mA mode and nothing shows.
    Did you short the battery with the meter in the "mA" range? The fuse was dropped as it suggests rafbid or the meter because even a fully discharged battery will show 50-200mA.
    You can shorten the normal AA battery temporarily (1-2 seconds) with a meter set to the 10 (or 20) A range.
    If the short-circuit current is above 3A, the battery is in good condition.
    Do not test the battery from the phone because you will destroy it.
  • #10 16343503
    rafbid
    Level 33  
    Posts: 2450
    Help: 153
    Rate: 418
    kieraso341 wrote:
    whether to measure the charging current of the battery in the car with an automatic meter, simply connect the black lead to com red to vmA and set the range on the voltage constantly?
    So you will measure the charging voltage.
  • ADVERTISEMENT
  • #11 16343506
    vodiczka
    Level 43  
    Posts: 30285
    Help: 1185
    Rate: 4311
    kieraso341 wrote:
    Does the red wire need to be connected to the 10A socket?
    Mandatory 10A otherwise recommend a fuse or meter :(
    You set the 10A DC current range and not the voltage range.
Reply | New topic
Report a violation of the law

Topic summary

LABEL_AI_GENERATED
The discussion focuses on using a multimeter to measure battery capacity and check diodes. Users inquire about measuring standard AA batteries and phone batteries, with suggestions to use a resistor or light bulb in series to unload the battery for accurate voltage readings. It is emphasized that measuring the charging current in a car requires connecting the multimeter correctly, with the black lead to COM and the red lead to the mA or 10A socket, depending on the measurement type. Caution is advised against shorting phone batteries, as this can damage them. The importance of checking the meter's fuse is also highlighted.
AI summary based on the discussion. May contain errors.
ADVERTISEMENT