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(1) How to Use and Precautions for Using an Analog Multimeter
(1) Mechanical Zero Adjustment: Before using the multimeter, always check if the needle is at the zero position. If it’s not, adjust the mechanical zero knob until the needle points to zero. This ensures accurate readings.
(2) Correct 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 ohm range (Ω) to determine the polarity of a diode, keep in mind that the “+†jack is actually the negative terminal of the internal battery, and the “-†jack is the positive terminal.
(3) Proper Connection for Measurement: When measuring voltage, the multimeter should be connected in parallel with the circuit. For current measurement, the circuit must be opened, and the multimeter should be connected in series. Always estimate the expected current before selecting the range. For the MF500 model, the fuse rating is between 0.3A and 0.5A, so never exceed this value. Some multimeters have a 10A range for measuring larger currents.
(4) Range Selection: Always turn off the power before changing the range. Never measure voltage while in the current or resistance mode, as this can damage the multimeter. Also, avoid measuring resistance when the circuit is powered.
(5) Choosing the Right Range: When measuring voltage or current, aim to have the needle deflect to about one-half or two-thirds of the full scale for better accuracy. When measuring resistance, try to get the needle near the center of the scale, as this is where the meter is most accurate. For AC voltage and current measurements, ensure that the input is a standard sine wave and within the frequency limits specified in the manual. When measuring AC voltages below 10V, use the special 10V scale, which is not evenly spaced.
By following these steps carefully, you can ensure safe and accurate measurements with your analog multimeter.
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