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2. List of electrical and electronic measuring equipment

   en.wikipedia.org/wiki/List_of_electrical_and...

   Creates constant-amplitude variable frequency sine waves to test frequency response Transistor tester: Tests transistors Tube tester: Tests vacuum tubes (triode, tetrode etc.) Wattmeter: Measures power in a circuit Vectorscope: Displays the phase of the colors in color TV Video signal generator: Generates video signal for testing purposes Voltmeter

3. Wattmeter - Wikipedia

   en.wikipedia.org/wiki/Wattmeter

   A wattmeter reads the average value of the product v(t)i(t) = p(t), where v(t) is the voltage with positive reference polarity at the ± terminal with respect to the other terminal of the potential coil, and i(t) is the current with reference direction flowing into the ± terminal of the current coil. The wattmeter reads P = (1/T) ∫ 0 T v(t)i ...

4. Current meter - Wikipedia

   en.wikipedia.org/wiki/Current_meter

   Both methods use a ceramic transducer to emit a sound into the water. Doppler instruments are more common. An instrument of this type is the Acoustic Doppler current profiler (ADCP), which measures the water current velocities over a depth range using the Doppler effect of sound waves scattered back from particles within the water column. The ...

5. Multimeter - Wikipedia

   en.wikipedia.org/wiki/Multimeter

   For example, a multimeter using a moving coil movement with full-scale deflection current of 50 microamps (μA), the highest sensitivity commonly available, must draw at least 50 μA from the circuit under test for the meter to reach the top end of its scale. This may load a high-impedance circuit so much as to affect the circuit, thereby ...

6. Electrical conductivity meter - Wikipedia

   en.wikipedia.org/wiki/Electrical_conductivity_meter

   Industrial conductivity probes often employ an inductive method, which has the advantage that the fluid does not wet the electrical parts of the sensor. Here, two inductively-coupled coils are used. One is the driving coil producing a magnetic field and it is supplied with accurately-known voltage. The other forms a secondary coil of a ...

7. Current clamp - Wikipedia

   en.wikipedia.org/wiki/Current_clamp

   When measuring current, the subject conductor forms the primary winding and the coil forms the secondary. This type may also be used in reverse, to inject current into the conductor, for example in electromagnetic compatibility susceptibility testing to induce an interference current. Usually, the injection probe is specifically designed for ...

8. Acoustic Doppler current profiler - Wikipedia

   en.wikipedia.org/wiki/Acoustic_Doppler_Current...

   In very deep water they can be lowered on cables from the surface. The primary usage is for oceanography. [4] The instruments can also be used in rivers and canals to continuously measure the discharge. Mounted on moorings within the water column or directly at the seabed, water current and wave studies may be performed. They can stay ...

9. Grounding resistance tester - Wikipedia

   en.wikipedia.org/wiki/Grounding_resistance_tester

   The analog grounding resistance tester is realized by four main blocks DC generator, rectifier, current and potential coil.The deflection of the pointer of the analog screen depends on the ratio of the voltage of pressure coil to the current of the current coil.