A digital multimeter is composed of an LCD screen, a gear knob, a pen jack, and function buttons. Its biggest feature is convenient reading, intuitive display, and high measurement accuracy. The following takes the VC9808 digital multimeter as an example.
1) LCD screen.
The display is used to display the value to be measured, it can display 4 digits, but the highest digit can only be displayed to 1, and the other digits can be displayed 0 9.
2) Function buttons.
Due to the many functions of this table, it is equipped with three function switching buttons, power is the power button, hold b l is the peak hold and the beep and diode backlight switch key, rel max min is the zero correction maximum value and minimum value switching key.
3) Gear knob.
The function of the gear knob is to select different measurement gears, this digital multimeter gear has diode measurement block, electric block, temperature block, inductance block, transistor magnification measurement block, DC voltage block, AC voltage block, DC current block, AC current block, frequency block.
3) Jacks. This digital multimeter has 4 separate jacks and 1 8-pin combination jack on the panel.
The one marked with the word "com" is the special jack for the black watch pen, the special jack for the red watch pen marked with "V Hz temp" is marked with the word MA, and the red watch pen should be inserted into the jack when measuring the current and inductance below 200mA.
Marked "20A" is a high-current jack, and when measuring a high-current in the range of 200mA and 20A, the red watch pen should be inserted into the jack.
The 8-pin combination jack on it is a triode magnification measurement jack.