Adjustment methods and precautions before using the multimeter
1, in the process of using the multimeter, you can not use your hand to touch the metal part of the pen, so that on the one hand, you can ensure the accuracy of the measurement, on the other hand, you can also ensure personal safety.
2,When measuring a certain amount of electricity, you can't change the gear at the same time of measuring, especially when measuring high voltage or high current, you should pay more attention to it, otherwise the multimeter will be destroyed. If you need to shift. Should first disconnect the meter pen. Shift the gear and then measure.
3, the multimeter must be placed horizontally when in use. So as not to cause errors. At the same time, should also pay attention to avoid the influence of external magnetic field on the multimeter.
4, the multimeter is used, should be placed in the conversion switch AC voltage maximum block. If it is not used for a long time, the battery inside the multimeter should be taken out, so as not to corrode other devices inside the meter after the battery leakage.
For the mechanical zeroing of the pointer multimeter; before using it, it should be "mechanically zeroed", also known as the initial zero position.
That is, in the absence of measured power before the measurement, so that the multimeter pointer in the position of zero voltage or zero current.
Mechanical zero refers to the case of adjusting the head hairspring torque without power, due to movement, temperature changes and other pointers may change; in general, this is not often need to adjust, focus on foot check and adjust, there is no change without adjustment.
For the multimeter ohm block zero, it is actually the current through the head to reach the full bias current, and ohm block in an adjustable resistance, I = E / (R + r), R is the resistance value of the adjustable resistor, r is the power supply internal resistance, when the R reaches a certain value, I in order to reach the full bias current. Then receive the measured electric sun Rx, then I =E/(Rs+R+r), different current corresponds to different resistance to be measured.
① Place the stopper adjustment knob at ΩX1 stop.
Connect the red pen to the "+" terminal and the black pen to the "1" terminal.
③ will be shorted to the measuring end of the pen (lap together), observe whether the needle is pointing at the scale line "Ω", as shown in Figure 1-4 above, such as not pointing to zero should be adjusted "ohm zero" knob, so that it points to zero.
④When adjusting the "ohm adjustment" knob, can not make the pointer in the 0", indicating that the table battery power is not enough, you should replace the battery inside the table.
The batteries in the multimeter should be replaced.
⑤ Many multimeter resistance of the highest multiplier block, in addition to press a high voltage battery (9V or 15V), should be replaced according to the requirements of the instructions. If you want to use this gear must be the corresponding battery.
