How to Read the Reading of the AC 500 Range Pointer Multimeter
For dial gauges with multiple rows on the dial of a pointer type multimeter, many beginners may seem very confused and do not know how to read the indicated reading of the dial where the pointer is located, especially when measuring voltage for high voltage ranges. Some early digital dial gauges only displayed a maximum value of 250 on the voltage range of the dial. In fact, in gear 500, multiplying the reading on the scale by two times is the correct reading. If there is a 100V gear, multiplying by four times is the correct reading.
The pointer type multimeter is mainly used for measuring AC and DC voltage, current, and resistance. The entire pointer type multimeter is mainly composed of a meter head, a meter head dial, a meter head correction screw, a function knob, an ohm correction knob, a probe socket, a transistor detection socket, a probe, and so on. Because the pointer type multimeter has many measuring functions, there are different graduation marks and graduation values on the dial. The dial scale of a pointer type multimeter consists of 5 concentric arc scale lines, each marked with a fixed reading scale value, which needs 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
3. Current value scale (A) [Note: Some meter heads have a common current and voltage value scale on the same scale line]
4. Decibel dial (DB)
5. Transistor amplification scale (hFE)
The new generation of pointer type multimeter has a reflector on the dial to eliminate measurement parallax.
The main question of the question is that the voltage measurement scale on the dial of a pointer type multimeter shows a maximum reading of 250. However, the function knob of the multimeter has a range selection of 500 gears, and some meters even have a range selection of 1000 gears. So, how should the measured voltage reading be read when it is set to 500 gears? As shown in the following figure, the voltage measurement function range of the 500 type multimeter has 500 options. In addition, the style shown in the figure even has a voltage range of 2500V for AC and DC voltage measurement. When measuring 2500V AC or DC, the black probe does not move, while the red probe must be inserted into the 2500V voltage socket in the bottom left corner of the figure:
