How to use pointer multimeter
General analog multimeters use the knob of the switch to change the measurement items and measurement range. The mechanical zero adjustment knob is used to keep the pointer at the left zero position at rest. The "Ω" zero adjustment knob is used to align the pointer with the right zero position when measuring resistance to ensure accurate measurement values.
The measuring range of the analog multimeter is as follows:
·DC voltage: divided into 5 levels-0-6V; 0-30V; 0-150V; 0-300V; 0-600V.
·AC voltage: divided into 5 levels-0-6V; 0-30V; 0-150V; 0-300V; 0-600V.
·DC current: divided into 3 levels-0-3mA; 0-30mA; 0-300mA.
·Resistance: divided into 5 levels-R*1; R*10; R*100; R*1K; R*10K.
The specific operation methods are as follows:
Measuring resistance: - First put the meter sticks together for a short circuit to deflect the pointer to the right, then adjust the "Ω" zero adjustment knob so that the pointer points exactly to 0. Then touch the two meter rods to both ends of the resistance (or circuit) being measured, read the pointer's reading on the ohm scale (the first line), and then multiply it by the number on the scale to get the resistance of the resistance being measured. . For example, use the R*100 block to measure resistance, and the pointer points to 80, then the measured resistance value is 80*100=8K. Since the readings on the left side of the "Ω" scale line are dense and difficult to read accurately, the appropriate ohm level should be selected when measuring. Make the pointer in the middle or right of the scale line so that the reading is clearer and more accurate. Every time you change gears, you should re-short the two meter rods and readjust the pointer to zero to achieve accurate measurement.
Measuring DC voltage: - First estimate the size of the voltage being measured, then move the switch to the appropriate V range, connect the positive meter rod to the "+" terminal of the measured voltage, and the negative meter rod to the "-" terminal of the measured voltage. . Then read the measured voltage based on the range number and the number pointed by the pointer on the scale line (second line) marked with the DC symbol "DC-". If you use the V300 volt range to measure, you can directly read the indicated value from 0 to 300. If you use the V30 volt level to measure, you only need to remove a "0" from the number 300 on the scale and regard it as 30, and then regard the numbers 200, 100 and other numbers as 20 and 10 in sequence, and you can directly read the value indicated by the pointer. For example, use the V6 volt range to measure DC voltage, and the pointer points to 15, then the measured voltage is 1.5 volts.
Measuring DC current: - First estimate the size of the current being measured, then set the switch to the appropriate mA range, and then connect the multimeter in series to the circuit, as shown in the figure. At the same time, observe the scale line marked with the DC symbol "DC". If the current range is selected at the 3mA level, then the number 300 on the surface scale line should be removed from the two "0"s and regarded as 3, and 200, 200, and 200 should be regarded as 3. 100 is regarded as 2 and 1, so that the measured current value can be read. For example, use the DC 3mA range to measure DC current. If the pointer is at 100, the current is 1mA.
Measuring AC voltage: - The method of measuring AC voltage is similar to measuring DC voltage. The difference is that there is no positive or negative distinction between AC voltage, so when measuring AC, the meter rod does not need to be divided into positive and negative. The reading method is the same as the above-mentioned method for measuring DC voltage, except that the number should be based on the pointer position on the scale marked with the alternating current symbol "AC".
