Usage instructions for digital multimeter

Reprinted from: http://wenku.baidu.com/view/899ae713a2161479171128a3.html

Note: This document uses the ut60e digital multimeter as an example.

1. When a digital multimeter is used to measure the diode, the positive voltage value of the diode is measured, and the positive and reverse resistance value of the diode is measured.

That is, the digital multimeter, the red table pen is connected to the positive pole of the internal power supply; and the pointer multimeter is opposite, the black table pen is connected to the positive pole of the internal power supply.

2. Insert the red table pen into the "hzv (euro)" Jack, the black table pen into the "com" Jack, the red table pen polarity is "+", and the black table pen polarity is "-".

That is, if the voltage is measured at this time, the red table pen should be connected to the positive electrode, and the result is also a positive voltage value.

3.Place the function range switch in the "diode" Measurement file. At this time, the red table pen is connected to the positive pole of the tested diode, and the black table pen is connected to the negative pole of the tested diode.

The result displayed on the screen is the approximate forward voltage reduction of the diode, which is generally 0.5-0.8 V.

Measurement considerations:

(1) If the diode is open or Polarity reversed, the display will display "0l ";

(2) when the measurement is online, the power supply must be disconnected before measurement and the related capacitor must be discharged.