1. Preparation before use
1) Good battery (note the positive and negative battery)
2) Insert the test leads. "-" Black; "+" red
3) Mechanical zero adjustment: Before measuring the multimeter, pay attention to whether the pointer of the meter head is on the zero scale line of the AC / DC scale when it is placed horizontally, otherwise the reading will have a large error. If it is not at the zero position, the pointer should be returned to the zero position by mechanical zero adjustment (that is, using a small screwdriver to adjust the mechanical zero adjustment knob below the meter head).
4) Range selection:
The first step: test. First make a rough estimate of the measured resistance value, and then select a suitable range.
Step 2: Select the correct gear. When measuring, the pointer stops in or near!
5) Ohm zero adjustment: After the range is selected, the zero must be adjusted before the formal measurement, otherwise the measurement value will have errors.
Method: Short the red and black pens to see if the pointer is at the zero scale position. If not, adjust the ohm zero knob to make it point at the zero scale position. Note: If the gear is changed again, it must be zeroed before the official measurement.
2.Measurement of the resistance to be measured
Multimeter two test leads are connected in parallel at both ends of the measured resistance for measurement.
Note: 1. It cannot be measured with power on. 2. The measured resistance must not have parallel branches. 3. Do not use two hands to measure the resistance of the metal part of the test lead, otherwise the resistance of the human body will be connected to the measured resistance and cause a measurement error.
Select the first scale when reading! Read from right to left. Resistance = scale value ╳ magnification
3. Gear reset:
Set the gear switch to the OFF position or the highest AC voltage
4.Measurement matters needing attention
1) The resistance value of the resistance to be measured should be measured by throwing the range switch to the minimum range, watching the pendulum swing, and then adjusting the range switch from small to large, so that the pointer points to the center of the dial, the range is appropriate.
2) Knowing the size of the resistance value, you can throw the range switch on a suitable range to measure.
3) When measuring, do not touch the two leads of the resistor with both hands at the same time to prevent measurement error.
4) Read the resistance value correctly according to the indication of the hands.
5) If the pointer points to the "zero" position or close to "zero" during measurement, it means that the gear selection is too large.
6) If the pointer points to "infinity" or close to "infinity" during measurement, the gear selection is too small.
7) Pay attention to the polarity of the multimeter's test leads. The red test lead is connected to the negative pole of the battery in the meter, and the black test lead is connected to the positive pole of the battery in the meter.
It is important to select a good range. When the pointer indicates 1/3 to 2/3 full scale, the measurement accuracy is the highest and the reading is the most accurate. It should be noted that when measuring a large resistance value of megohm level with R × 10k resistance file, do not pinch your fingers at both ends of the resistance, so the human body resistance will make the measurement result smaller.
5, multimeter use tips
One look: pick up the test pen to see the gear
Second pull: Corresponding power pull in place
Third try: instantaneous deviation test gear
Four test: measure stable record
Five reset: put the pen and reset