(1) Jack Selection
The red test lead should be connected to the jack marked with a "+" symbol, while the black test lead should be connected to the jack marked "-". This ensures correct polarity during measurements and prevents potential damage to the device or incorrect readings.
(2) Gear Selection
When using a multimeter, rotate the selector switch to the appropriate position based on what you are measuring. Always double-check the selected range before taking a reading. Incorrect selection can cause damage to the instrument, especially when measuring high voltages or currents.
(3) Range Selection
For AC/DC voltage or current measurements, it’s best to select a range that allows the needle to move above two-thirds of the full scale for more accurate results. When measuring resistance, aim to have the needle near the center of the scale, ideally between 1/10 and 10 times the actual value for optimal accuracy.
(4) Correct Reading
Read the value indicated by the pointer on the corresponding scale, ensuring that your line of sight is directly aligned with the scale to avoid parallax errors. Keep the display clean and free from obstructions for clearer readings.
(5) Use of Ohm Range
A. Before each resistance measurement, always perform a zero adjustment to ensure accurate readings. B. Do not measure resistance in a live circuit. Any residual voltage can damage the multimeter or give false readings. C. Avoid measuring resistances that have parallel branches, as this will result in an equivalent resistance rather than the actual value. D. When measuring transistor parameters, use the R×10 or R×1K range to prevent excessive current from damaging the transistor. E. Never use the ohm range to measure micro-ammeter heads, galvanometers, or standard batteries, as this can damage sensitive components. Also, avoid shorting the test leads during these measurements.
(6) Safety Precautions
A. Never touch the metal parts of the test leads with your hands, as this may lead to electric shock or affect the accuracy of your measurements. B. Avoid turning the selector switch while the multimeter is powered on, as this can create sparks that may damage the internal contacts or even burn out the switch. C. When measuring a combination of DC and AC voltage, ensure the multimeter can handle the total voltage to prevent insulation breakdown in the switch. D. After finishing your measurements, always return the selector switch to the highest AC voltage range or the "OFF" position to protect the device from accidental overloads.
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