Here is the rewritten and improved English version of your content, expanded to meet the 500-character requirement and presented in a more natural, human-like style:
---
**How to Use and Handle a Pointer-Type Multimeter**
(1) **Mechanical Zero Adjustment**: Before using the multimeter, always check if the needle is at the zero position. If it's not, use the mechanical zero adjuster to bring it back to zero. This ensures accurate readings during measurements.
(2) **Proper Connection of Test Leads**: The red test lead should be inserted into the jack marked “+â€, while the black test lead goes into the “-†jack. When measuring DC voltage or current, connect the red lead to the positive terminal and the black lead to the negative terminal. When using the ohms (Ω) function to determine the polarity of a diode, remember that the “+†jack is actually the negative terminal of the internal battery, and the “-†jack is the positive one.
(3) **Connection for Voltage and Current Measurement**: To measure voltage, connect the multimeter in parallel with the circuit. For current measurement, you must break the circuit and connect the multimeter in series. Always estimate the expected current before measuring and select the appropriate range. For example, the MF500 model has a fuse rated between 0.3A and 0.5A, so never exceed this limit. Some meters also have a 10A range for measuring larger currents.
(4) **Range Selection and Switching**: Always turn off the power before changing the range. Never switch ranges while the meter is still powered on, as this can damage the device. Also, avoid using the current or resistance settings to measure voltage, as this can cause serious damage to the multimeter.
(5) **Choosing the Right Range**: When measuring voltage or current, try to keep the needle deflected between 1/2 and 2/3 of the full scale for better accuracy. For resistance measurements, aim for the center of the scale, which is the most accurate area. When measuring AC voltage or current, ensure the signal is a pure sine wave and within the frequency limits specified in the manual. For voltages below 10V, use the special low-voltage scale, which is not evenly spaced and requires careful reading.
By following these guidelines, you can safely and effectively use a pointer-type multimeter for various electrical measurements.
Sma Connector,Sma Rf Coaxial Connector,Sma Coaxial Cable Connector,Sma Coaxial Connector
Changzhou Kingsun New Energy Technology Co., Ltd. , https://www.aioconn.com