Measurement results and test units are displayed on the LCD screen
RANGE key: Select automatic range or manual range operation mode. The instrument starts in automatic range mode and displays the "AUTO" symbol in the upper left corner of position 1. Press this function key to switch to manual range, press once to increase one gear, and cycle from low to high. The DC voltage has 400mV, 4V, 40V, 400V, and 1000V levels, while the AC voltage has 400mV, 4V, 40V, 400V, and 700V levels. If the display shows "OL" in manual range mode, it indicates that the range has been exceeded. If this button is continuously pressed for more than 2 seconds, it will return to the automatic range state.
REL key: Press this key to reset the reading and enter relative value measurement. The "REL" symbol will be displayed above the LCD display. Press it again to exit relative value measurement.
HOLD key: Press this function key to keep the current measured value on the LCD display. The "HOLD" symbol will be displayed above the LCD display. Press it again to exit the hold state.
HZ/DUTY key: When measuring AC/DC voltage (current), press this function key to switch frequency/duty cycle/voltage (current). When measuring frequency, switch frequency/duty cycle (1-99%).
~/- Key: AC/DC working mode conversion key.
4. Precautions for using a multimeter:
1) The peak value of the AC voltage measured by the instrument shall not exceed 700V, and the DC voltage shall not exceed 1000V. The frequency response of the AC voltage is: the range of 700V is 40-100Hz, and the other ranges are 40-400Hz.
2) Do not measure resistance when the circuit is live. Do not measure voltage in current mode, resistance mode, diode mode, and buzzer mode.
3) When testing the instrument, the function conversion switch cannot be rotated, especially during high voltage and high current, and live range conversion is strictly prohibited.
4) When the battery symbol appears on the screen, it indicates that the battery is low and should be replaced.
5) In circuit experiments, a multimeter is generally not used to measure current. After each measurement, the instrument should be turned off.
