Test Diodes with Multimeter

Beginners can use a multimeter to test the performance of diodes in amateur conditions. Before the test, first, switch the switch of the multimeter to the RX1K position of the ohm gear (be careful not to use the RX1 gear to avoid excessive current and burn the diode), and then short-circuit the red and black test leads to perform ohmic zero adjustments.

1. Positive characteristic test

Touch the black lead of the multimeter (positive in the watch) to the anode of the diode, and the red lead (negative in the watch) to the cathode of the diode. If the hand is not set to 0 but stopped at the middle of the dial, the resistance at this time is the forward resistance of the diode. Generally, the smaller the forward resistance, the better. If the forward resistance is 0, it indicates that the die is short-circuit damaged. If the forward resistance is close to infinity, it means that the die is open. Neither short-circuit nor open-circuit pipes can be used.

2. Reverse characteristic test

If you touch the red lead of the universal watch to the anode of the diode and the black lead to the cathode of the diode, if the needle is at or near infinity, the tube is qualified.
Alanlin 13 april 2020, 2:01
Vote for this post
Bring it to the Main Page


Leave a Reply

Avaible tags
  • <b>...</b>highlighting important text on the page in bold
  • <i>..</i>highlighting important text on the page in italic
  • <u>...</u>allocated with tag <u> text shownas underlined
  • <s>...</s>allocated with tag <s> text shown as strikethrough
  • <sup>...</sup>, <sub>...</sub>text in the tag <sup> appears as a superscript, <sub> - subscript
  • <blockquote>...</blockquote>For  highlight citation, use the tag <blockquote>
  • <code lang="lang">...</code>highlighting the program code (supported by bash, cpp, cs, css, xml, html, java, javascript, lisp, lua, php, perl, python, ruby, sql, scala, text)
  • <a href="http://...">...</a>link, specify the desired Internet address in the href attribute
  • <img src="http://..." alt="text" />specify the full path of image in the src attribute