Ultra practical multimeter usage guide

Today, I have compiled a highly practical guide for using a multimeter. From preparation and measurement essentials to safety taboos and storage methods, I will explain step by step,

Even beginners can easily get started by following the instructions, and experienced electricians can also identify and fill in gaps!

First of all, let me tell you that a digital multimeter has a wide range of functions, including measuring AC/DC voltage, AC/DC current, resistance, capacitance, inductance, as well as frequency

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Degree, bipolar parameters, built-in data retention, backlight illumination, fully sufficient for daily electrical work.

Preparation before measurement

1. Check the appearance: First, check whether the multimeter casing and probe insulation are damaged, and whether the metal parts are exposed to avoid leakage; Turn the gear knob again

Check if it is clear, if there is any jamming, and ensure that the gear can be switched normally.

Battery; Without these characters, measurements can be taken normally. 2、 Common measurement essentials

2. Check the battery: Press the ON/OFF switch. If "LOBAT" or "BAT" appears on the right side of the LCD screen, it indicates that the battery voltage is too low. Quickly switch to a novice

1. Measure voltage (AC V~/DC V -) 2. Measure current (A)

Insert the black probe into the COM hole and the red probe into the V/S hole; Turn the gear knob to ACV or DCV mode, estimate the voltage being measured first, and if unsure, select the highest

File, avoid burning the watch; Touch the two probes separately to the test point, and the display screen will show the voltage value. If it shows overflow, switch to a higher gear and test again.

Insert the black probe into the COM port, and the red probe into the A port based on the current. If the estimated current is between 200mA and 10A, insert it into the 10A port. Otherwise, insert it into the A port; Shift to gear

In ACA or DCA mode, connect the multimeter in series with the measured branch to see the current value; Remember to insert the red probe back into the V/S hole after measuring, don't forget!

3. Measure resistance ()

Cut off the power supply of the circuit first, discharge the capacitor, and avoid errors in live measurement; Insert the black probe into the COM hole, the red probe into the V/S hole, and shift the gear to the desired resistance level,

Connect the probe across the measured resistor, being careful not to touch the metal part of the probe with your fingers, as it may affect the measurement result. When the input is open, the display screen will show "1" or

OL ": If the measured resistance is above 1MO, it takes a few seconds to read the stable value.

4. Measuring diodes

5. Measure capacitance (C)

Cut off the power supply and discharge the capacitor first; Insert the black probe into the COM hole, the red probe into the V/S hole, shift the gear to the diode symbol, and the red probe contacts the tested object

Point. If values around 0.3 and 0.8V are displayed, it indicates that the diode is functioning properly; If reversed, it will display an out of range status.

First, short-circuit and discharge the two pins of the capacitor to prevent electric shock; Switch the gear to the desired capacitance range and connect the measured capacitance to a CX "or" Cx Lx "socket with polarity

Capacitors should be connected correctly according to the markings; The reading of large capacity capacitors will be slower, just be patient and wait for stability.

3、 Safety taboos

1. It is strictly prohibited to use current holes to measure voltage or use resistance settings to measure live circuits, as it can easily burn the multimeter and even cause electric shock,

2. It is strictly prohibited to shift gears during the measurement process. The probe must be removed before shifting gears.

When measuring high current (10A), it is necessary to measure and release quickly, and the time should not exceed 10 seconds to prevent the multimeter from overheating and damage.

4、 Readings and maintenance

1. The reading should be read after the display screen stabilizes. If unsure, use the HOLD key to lock the reading to avoid reading errors.

2. If the battery voltage is found to be too low, replace it with a new battery in a timely manner, otherwise the measurement results may be inaccurate and the instrument may be damaged.

5、 Save method

1. After the measurement is completed, turn the range knob to the highest AC voltage level to prevent operational errors from burning the meter during the next measurement.

If not used for a long time, be sure to remove the battery to avoid deterioration, leakage, and damage to the internal circuit board.

In fact, a multimeter is not difficult to use. As long as you remember the correct use of gears and probes, guard against safety taboos, and practice a few more times, you can master it proficiently. Whether it's a beginner or not

Old electricians should develop the habit of standardized operation.