How to use the pointer multimeter
(1) Familiarize with the meaning of the symbols on the dial and the main functions of each knob and selector switch.
(2) Perform mechanical zero adjustment.
(3) According to the type and size of the measurement, select the gear and range of the transfer switch to find the corresponding tick mark.
(4) Select the position of the test lead jack.
(5) Measurement voltage: When measuring voltage (or current), select a good range. If you use a small range to measure large voltage, there is a danger of burning the watch. If you use a large amount of process to measure small voltage, the pointer deflection is too small. Unable to read. The range should be chosen to deflect the pointer to about 2/3 of the full scale. If you do not know the magnitude of the voltage to be measured beforehand, you should first select the highest range and then gradually reduce it to the appropriate range.
a AC voltage measurement: put one switch of the multimeter in the AC and DC voltage, and the other switch is placed on the appropriate range of the AC voltage. The multimeter's two test leads and the circuit under test or load can be connected in parallel.
b DC voltage measurement: put one switch of the multimeter in the AC and DC voltage, the other switch is placed on the appropriate range of DC voltage, and the “+†meter (red pen) is connected to the high potential, “- The test pen (black pen) is connected to the low potential, that is, the current flows from the "+" test pen and flows out from the "-" test pen. If the test leads are reversed, the pointer of the watch will deflect in the opposite direction, which is easy to bend the pointer.
(6) Measuring current: When measuring DC current, put one switch of the multimeter in DC current block, and the other switch is placed on the appropriate range of 50uA to 500mA. The range selection and reading method of current are the same as voltage. The circuit must be disconnected first, and then the multimeter is connected in series to the circuit under test according to the current from "+" to "-", that is, the current flows from the red meter pen and flows out from the black meter pen. If the multimeter is connected in parallel with the load, the internal resistance of the meter head is small, which may cause the short circuit to burn the instrument. The reading method is as follows:
Actual value = indication value × range / full deviation
(7) Measuring resistance: When measuring resistance with a multimeter, it should be done according to the following method*:
a mechanical zero adjustment. Before use, the pointer positioning screw should be adjusted so that the current is zero, avoiding unnecessary errors.
bSelect the appropriate override. The scale of the multimeter's ohmic gear is not uniform, so the selection of the override gear should be such that the pointer stays in the thinner part of the scale, and the closer the pointer is to the middle of the scale, the more accurate the reading. Under normal circumstances, the pointer should be pointed between 1/3~2/3 of the scale.
c ohms zero. Before measuring the resistance, short the two test leads and adjust the “ohmic (electrical) zero adjustment knob†so that the pointer just points to the zero position to the right of the ohmic scale. If the pointer cannot be adjusted to zero, the battery voltage is insufficient or there is a problem inside the meter. And every time you change the override gear, you must perform ohms zero again to ensure accurate measurement.
d Reading: The reading of the meter is multiplied by the magnification, which is the resistance of the measured resistance.
Pointer type multimeter considerations
a When measuring current and voltage, it is not possible to charge range
b When selecting the range, first select the big one, then select the small one, try to make the measured value close to the range.
c When measuring resistance, it is not possible to measure with electricity. Because the multimeter is powered by the internal battery when measuring resistance, if the live measurement is equivalent to accessing an additional power supply, the meter may be damaged.
d After use, the switch should be in the maximum gear or neutral of the AC voltage.
e Note that when the ohmmeter is changed range, ohms zero adjustment is required, and no mechanical zero adjustment is required.
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