Master The Art Of Sanwa Analog Multimeter: A Step-By-Step Guide For Beginners

Analog multimeters, such as those produced by Sanwa, are essential tools for electrical testing and troubleshooting. While they may appear complex at first, understanding how to read them is straightforward with the right guidance. This comprehensive guide will empower you to decipher the measurements displayed on Sanwa analog multimeters, enabling you to perform accurate electrical assessments.

Understanding the Meter’s Components

Sanwa analog multimeters typically feature the following components:

• Meter Scale: A circular or linear scale with marked divisions that indicate the measured values.
• Needle Indicator: A movable needle that points to the measured value on the scale.
• Range Selector Switch: A knob that allows you to select the appropriate measurement range for the task.
• Input Terminals: Two or more terminals where you connect the probes to make measurements.

Selecting the Correct Range

The first step in reading a Sanwa analog multimeter is to select the correct range. This is crucial to ensure accurate measurements and prevent damage to the meter. Refer to the meter’s manual or the markings on the range selector switch to determine the appropriate range for the expected measurement.

Interpreting the Meter Scale

Once the range is selected, the needle indicator will point to a specific value on the scale. The scale is divided into major and minor divisions, each representing a specific increment of measurement. For example, a scale with 10 major divisions and 5 minor divisions would represent 50 units of measurement (10 x 5).

Reading the Measurement

To read the measurement, multiply the number of major divisions pointed to by the needle by the value of each major division. Then, add the number of minor divisions pointed to by the needle multiplied by the value of each minor division.

For instance, if the needle points to the 4th major division and the 2nd minor division, and each major division represents 10 units and each minor division represents 2 units, the measurement would be:

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4 (major divisions) x 10 (units/major division) + 2 (minor divisions) x 2 (units/minor division) = 48 units
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Measuring Voltage

To measure voltage, connect the black probe to the common terminal and the red probe to the positive or negative terminal of the circuit. Set the range selector switch to the appropriate voltage range. The needle will indicate the voltage level on the scale.

Measuring Current

To measure current, connect the black probe to the common terminal and the red probe in series with the circuit. Set the range selector switch to the appropriate current range. The needle will indicate the current flowing through the circuit on the scale.

Measuring Resistance

To measure resistance, connect the black probe to the common terminal and the red probe to the resistor. Set the range selector switch to the appropriate resistance range. The needle will indicate the resistance on the scale.

Measuring Continuity

To test for continuity, connect the black probe to one end of the circuit and the red probe to the other end. Set the range selector switch to the lowest resistance range. If the needle deflects to the right, the circuit is continuous.

Common Questions and Answers

Q: Why is the needle not moving when I connect the probes?
A: Ensure that the probes are properly connected to the input terminals and that the range selector switch is set to the correct range.

Q: What does it mean when the needle swings back and forth?
A: This indicates an unstable measurement. Check the connections and ensure that the circuit is stable.

Q: Can I use a Sanwa analog multimeter to measure AC voltage?
A: No, Sanwa analog multimeters are designed to measure DC voltage only.