Pointer multimeter to measure DC voltage which pen is connected to the positive pole
With a pointer multimeter, measuring DC voltage should first check the multimeter good and bad, accurate measurement and pointer sensitivity or not. Will be inserted into the red pen labeled ten. V / Ω ″ jack, the black pen into a C0M ″ jack, the gear knob to the resistance of any file, short red and black pens, the pointer deflected to the right to zero or so, and then rotate the zero knob, the pointer to zero. If the pointer is at the infinity position, and the short-connected pen does not swing to the right, then you need to check the meter.
When measuring DC voltage, if the voltage value is known, the knob can be directly adjusted to the corresponding DCV gear. It is worth mentioning that the closer the gear and the measured voltage, the measured value is more accurate, such as 1.5v choose 2.5v gear, 12v24v choose 50v gear, etc., such as if you do not know the measured voltage, should be selected from the highest gear, and then measured and downshift until the measured voltage and the selected gear is close to the appropriate, do not measure the high voltage of the lower gears, which will make the pointer deflection and easy to damage the multimeter. When measuring, place the multimeter as horizontally as possible, so as not to affect the accuracy of the measurement value.
In the measurement of DC voltage must be red pen to the positive pole, black pen to the negative pole, otherwise the needle will be deflected and easy to damage the multimeter, known as the battery is 9v, select 10v gear.
Read the value should look at the second head of the table labeled with ACV.DCV that scale line, from left to right counting scale line, the value of the actual scale line readings multiplied by the value of the gear divided by the total scale line difference, that is, the final value. As shown above 47X (10 ÷ 50) two 9.4 Ⅴ This is just bought a new battery, the measured value is slightly higher than the labeled value, indicating that the battery's performance is very good!
