How to Measure Precision Equipment Ground Voltage with a Multimeter
Precision equipment is to have absolutely good grounding, if not all kinds of power interference will affect the precision of precision equipment, the conventional method is to use megohmmeter shaking to the ground absolute resistance, but encountered precision equipment test electronic precision equipment that can not be used megohmmeter, because the megohmmeter generated by the high voltage will break through the components of precision electronic equipment, so also need to use the multimeter, the equipment is static when I use a multimeter on-site measurements are generally used to measure the resistance value between the equipment ground terminal and the standard ground. Pointer meter X1 gear to measure the equipment ground terminal and the standard ground between the resistance value, equipment dynamics directly with the multimeter DC voltage file to measure the equipment ground and the standard ground voltage, the general equipment to produce ground voltage when the voltage is not the standard DC voltage, it is recommended to use the pointer multimeter, the pointer multimeter can be a rough monitoring of the ground voltage condition of the equipment in different operating conditions, such as precision equipment work, line Started a frequency converter or welding machine work on precision instruments produce high harmonic interference, this time with a pointer table is more intuitive, while the digital table pop-up word a moment is 8, a moment is 0 trend can not see.
How to use a multimeter to measure resistance and read the number of resistance value
In the repair of electronic circuit boards, circuit boards on its resistance components account for about 50% of the entire electronic components, if the circuit has a fault resistance components is one of the components we have to measure.
So how to use a multimeter to measure resistance and read the number of resistance? Below I give you the problems in this regard, before measuring resistance we had better carry out two zeroing operations, one is the pointer multimeter mechanical zeroing; the second is the ohm zeroing. After the operation of these two steps you can choose the appropriate resistance multiplier for resistance measurements, due to the multimeter resistance file scale is not uniform, we choose the multiplier file generally want to make the pointer scale stays in the sparse part of the scale is the best, and the closer the pointer is to the middle of the scale position the more accurate. I suggest that it is best to make the pointer in the scale of 1/3 to 2/3.
Reading Methods
The method of reading the multimeter is not complicated, that is, the reading of the meter head is multiplied by the multiplier, that is, the resistance value of the resistor to be measured. For example, to measure the resistance value of a resistor is 47 ohms, then the range to "Rx10" on the ohms file, then Hou multimeter pointer points to the position of 4.7, the final reading is 4.7x10 for 47 ohms. If the measurement of large resistors can choose a larger resistance range, such as Rx1k or Rx10K, they read the resistance value of the same method.
