4
2-3 RANGE key: This key is used for selection of automatic or manual range. The instrument is in the state
of automatic range initially, and shows the sign “AUTO”. After this functional switch is pressed, it will turn
into manual range. The level will be increased by one every time when the key is pressed, and it will recycle
from low to high in turn. After the key is pressed for more than 2s continuously, the product will return to
the state of automatic range;
2-4 HOLD key: After this functional switch is pressed, the current numerical value measured with the
instrument will be held on the LCD unit, which will show the sign “HOLD”; and after this key is pressed
once more, the instrument will exit from the holding state.
2-5 Maximum/ minimum value measurement key: The key is triggered for measurement of maximum value,
then triggered for measurement of minimum value, and triggered the second time for the measurement of
the difference between the maximum and the minimum value. It recycles successively this way;
2-6 The key for conversion of AC/DC current and diode/ resistance/ buzzer.
3. Knob switch: Used to change the measuring function and range;
4. Voltage, resistance, capacitance, frequency input end;
5. Public ground;
6. Socket for test of less than 400mA current;
7. 10A current test socket.
4-2 DC voltage measurement
1. Insert the black multimeter probe into “COM” end, and the red multimeter probe into “V
Ω
Hz” end;
2. Convert the functional switch to the voltage level;
3. The instrument is initially in the state of automatic range, and displays the sign “AUTO”; after “RANGE”
key is pressed, it will turn into the mode of manual range, and the ranges 400mV, 4V, 40V, 400V, and 1000V
are optional;
4. Make the testing multimeter probe contact the tested point, and the voltage and polarity of this point
contacted by the red multimeter probe will be displayed on the screen.
NOTES:
1. Under the mode of manual range, if the LCD displays “OL”, it indicates going beyond the range, and
“RANGE” key shall be rotated to a higher level;
2. The voltage measured shall never exceed DC1000V, or the instrument circuit will possibly be damaged;
3. Never contact the high-voltage circuit measured.
4-3 DC millivolt voltage measurement
1. Insert the black multimeter probe into “COM” end, and the red multimeter probe into “V
Ω
Hz” end;
2. Convert the functional switch to “mV” level;
3. The instrument doesn’t show the sign “AUTO”, and this level of voltage may be used for measurement
only when the voltage is no bigger than 400mV;
4. Make the testing multimeter probe contact the tested point, and the voltage and polarity of this point
contacted by the red multimeter probe will be displayed on the screen.
NOTES:
1. If LCD shows “OL”, it indicates going beyond the range, and here, AUTO DC voltage level of the
automatic range shall be used for measurement.
2. Never use high-voltage DC400mV for measurement at this level.
4-4 AC millivolt true effective voltage measurement
1. Insert the black multimeter probe into “COM” end, and the red multimeter probe into “V
Ω
Hz” end;
2. Rotate functional switch to “mV” level, and press “SELECT” key to display ACmV. At this level, there is
no the sign “AUTO”. Users shall never use this level for measurement in case of AC voltage higher than
400mV;
3. Make the testing multimeter probe contact the tested points, and the voltage of the two points contacted
by the multimeter probe will be displayed on the screen.
NOTES:
1. When LCD shows “OL”, it indicates going beyond the range, and the product shall be turned to automatic
AC voltage measurement.
2. Never use a voltage of higher than AC400mV for measurement at this level, or the instrument will be
damaged.
4-5 True effective value measurement of AC voltage
1. Insert the black multimeter probe into “COM” end, and the red multimeter probe into “V
Ω
Hz” end;
