How to read the reading of AC 500 gear of pointer multimeter
For the multi-row scales on the pointer-type universal dial, many beginners seem to be very confused. They don’t know how to read the indication reading of the dial where the pointer is located, especially for high-voltage gears when measuring voltage. Reading, because the scale of the voltage scale of some early pointer digital meter dials only shows a value of 250 at the highest. In fact, in the gear of 500, that is to multiply the reading on the scale by 2 times, which is the correct reading. If there is a gear of 100V, multiply it by 4 times.
The pointer multimeter is mainly used for the measurement of AC and DC voltage, current and resistance. The entire pointer multimeter is mainly composed of meter head, meter head dial, meter head correction screw, function knob, ohm correction knob, test lead jack, transistor detection jack, test lead, etc. Just because the pointer multimeter has many measurement functions, there are classifications on the dial to indicate different scale lines and scale values. The dial scale line of the pointer multimeter is composed of 5 concentric arc scale lines, and each scale line is marked with a fixed reading scale value, and these scale values need to be read in conjunction with the gear position of the function knob.
The scale lines on the dial, from top to bottom, are:
1. Resistance scale (Ω)
2. DC/AC voltage (DC/AC)
3. Current value scale (A) [Note: Some scale lines of the current and voltage values of the meter head are common, and they are on the same scale line]
4. Decibel dial (DB)
5. Transistor magnification scale (hFE)
The dial of the new generation of pointer multimeter has a reflector on the dial to eliminate measurement parallax.
The question of the subject is that the scale line value of the scale line on the scale line on the dial of the pointer multimeter shows a maximum reading of 250, but the function knob of the multimeter has a range selection of 500 levels, and some meters even have a range of 1000 levels. How to read the measured voltage reading when it reaches the 500 gear? As shown in the figure below, the voltage measurement function range of the 500-type multimeter has 500 gears to choose from. In addition, the style and voltage range in the figure below even have 2500V AC and DC voltage measurement range options. When the meter in the figure below measures 2500V AC or DC, black The test lead does not move, and the red test lead must be inserted into the 2500V voltage jack in the lower left corner of the figure below:
How to read the reading when measuring voltage?
The AC and DC voltage scale values on the dial of the multimeter are distributed equidistantly, with a total of 5 large divisions, each of which is divided into 2 equal divisions of middle divisions, and each middle division is subdivided into 5 small divisions. Each grid represents the reading value is different because of the different gear selection.
The main question is how to read the reading on the dial when the gear is at 500? In fact, it is very simple. There are 5 large grids on the dial. At this time, each large grid represents "100", and each small grid represents "10". That is to say, the highest "250" is displayed on the far right of the scale line. If you hit the 500 gear, then you multiply this scale by 2 to get the current reading. If the multimeter in the above picture is set to the 2500 gear, then the reading is multiplied by 10 times. If the pointer points to the 250 scale on the dial, the reading will be 2500.
