Learning Outcome 1

Select Measuring Tools and Instruments

PERFORMANCE STANDARDS

  • Measuring tools and instruments are selected/ classified as per object to be measured on job requirements.

  • Measurements are obtained according to job requirements.

  • Computation of resistance, current, and voltage using Ohms Law are obtained.

Materials/ Resources

  • Ruler

  • Push-pull tape rule

  • Multi-meter

  • zigzag rule

  • Wire gauge

  • Micrometer caliper

  • Vernier caliper

  • Activity Sheets

What Do You Already Know?

Let us determine how much you already know about selecting measuring tools and instruments. Take this test.

What Do You Need To Know?

Read the Information Sheet 1.1 very well then find out how much you can remember and how much you learned by doing Self-check 1.1.

MEASURING TOOLS AND INSTRUMENTS

​Measurement is the process or the result of determining the ratio of a physical quantity, such as a length, time, temperature, etc., to a unit of measurement, such as the meter, second or degree Celsius. The science of measurement is called metrology. The English word measurement originates from the Latin mēnsūra and the verbmetiri through the Middle French mesure.

  • Test Light- a pocket size tool used to test the line wire or circuit if there is current in it.

  • Micrometer- used to measure the diameter of wires/conductors in circular mils. It can measure small and big sizes of wires and cables.

  • Wire Gauge- used in determining the size of wires/conductors. The gauge ranges from 0 to 60 awg (American wire gauge)

  • Ruler/foot rule- a measuring tool used to measure length, width and thickness of short flat object and in sketching straight lines. The ruler is the instrument used to rule straight lines and the calibrated instrument used for determining length called a measure. However, common usage calls both instruments rulers and the special name straight edge is used for an unmarked rule.

  • Pull-Push Rule - a measuring tool used to measure the length of an object in centimeter and inches.

  • Ammeter - an instrument used to measure the amount of electrical current intensity in a circuit. The unit of measure is ampere (a). It is connected along or series to the circuit.

  • Voltmeter - an instrument used to measure electrical pressure or voltage of a circuit. The unit of measure is volt (v). This is connected across or parallel to the circuit.

  • Clamp Ammeter(also called tong-tester)- It is used to measure current flowing in a conductor. It is clamped or hanged in a conductor.

  • Volt-Ohmmeter (VOM) - otherwise called as Multi-tester; is used to measure the voltage, resistance and current of a circuit. It is connected in parallel or series with the circuit depending on what to measure.