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Home News Principle of measuring resistance with a...

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.

3.Reading

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


Product Categories

  • Shanghai Automation Instrumentation No. 3 Factory
    • Thermocouples
    • Thermal resistance
    • Bimetal thermometer
    • Temperature transmitter
    • Non-contact thermometer
  • Shanghai Automation Instrumentation No. 4 Factory
    • Pressure guages
    • Pressure transmitters
    • pressure controllers
  • Shanghai Far East Instrumentation Factory
  • Shanghai Automation Instrumentation No. 5 Factory
    • Ultrasonic Level Meter
    • Magnetic Level Gauge
    • Magnetostrictive Liquid Level Transmitter
    • Radar Level Meter
    • Electric Float Level Transmitter
    • Floating Ball Level Meter
    • Floating Ball Liquid Level Switch
    • Radio frequency admittance switch
    • Input-Type Liquid Level Transmitter
    • Tuning Fork Level Switch
    • Intelligent Radar Level Meter
    • Resistance level switch
  • Shanghai No. 9 Automation Instrumentation Co., Ltd.
    • Electromagnetic Flowmeter
    • V-Cone Flowmeter
    • Glass Rotor Flowmeter
    • Metal Tube Rotor Flowmeter
    • Throttling Device
    • Ellipse Flowmeter
    • Vortex Flowmeter
    • Turbine Flowmeter
    • Wedge Flowmeter
    • Sliding vane flowmeter
    • Roots flowmeter
    • Flow Switch
  • Shanghai Automation Instrumentation No. 11 Factory
    • Electric Actuator
    • electric-pneumatic valve positioner
    • angle electric actuator
    • Intelligent electric actuator
  • Shanghai Automation Instrumentation No. 7 Factory
    • Electric valve
    • Pneumatic valve
    • Manual Valve
    • Electric Actuator
    • Electric Valve Actuator
    • Pneumatic Actuator
    • Electric Actuator Accessories
  • Shanghai Automation Instrumentation Co., Ltd.
  • Shanghai ZiYi Marine Instrument Co.,Ltd
    • Frequency Meter
    • Ammeter
    • Power Factor Meter
    • Voltmeter
    • Current voltmeter
    • Controllable Voltage Regulator
    • Megger
  • Shanghai Automation Instrument Tachometer and Instrument Motor CO.,LTD
    • Fixed magnetic tachometer
    • Handheld centrifugal tachometer
    • Rotating speed digital displayer
    • Electric tachometer
    • Non-contact handheld digital tachometer
    • Standard speed generator
  • Shanghai Dahua Instrument Factory
    • Automatic balanced recorder
    • Circular chart recorder
    • Intelligent digital display regulator
    • Intelligent data logging device
  • Shanghai Hua Dong Electronic Instrument Factory
    • Weighing sensor
    • Weighing controller
    • Weighing amplifier
    • Weighting Resistance Strain Meter

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