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2. Four-terminal sensing - Wikipedia

   en.wikipedia.org/wiki/Four-terminal_sensing

   Four-point measurement of resistance between voltage sense connections 2 and 3. Current is supplied via force connections 1 and 4. In electrical engineering, four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements ...

3. Contact resistance - Wikipedia

   en.wikipedia.org/wiki/Contact_resistance

   [2] Beside the TLM it was proposed the gated four-probe measurement [3] and the modified time-of-flight method (TOF). [4] The direct methods able to measure potential drop on the injection electrode directly are the Kelvin probe force microscopy (KFM) [5] and the electric-field induced second harmonic generation. [6]

4. Ammeter - Wikipedia

   en.wikipedia.org/wiki/Ammeter

   An ammeter (abbreviation of ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. For direct measurement, the ammeter is connected in series with the circuit in which the current is to be measured.

5. LCR meter - Wikipedia

   en.wikipedia.org/wiki/LCR_meter

   An LCR meter is a type of electronic test equipment used to measure the inductance (L), capacitance (C), and resistance (R) of an electronic component. [1] In the simpler versions of this instrument the impedance was measured internally and converted for display to the corresponding capacitance or inductance value.

6. Bridge circuit - Wikipedia

   en.wikipedia.org/wiki/Bridge_circuit

   The best-known bridge circuit, the Wheatstone bridge, was invented by Samuel Hunter Christie and popularized by Charles Wheatstone, and is used for measuring resistance. It is constructed from four resistors, two of known values R 1 and R 3 (see diagram), one whose resistance is to be determined R x , and one which is variable and calibrated R 2 .

7. Sense (electronics) - Wikipedia

   en.wikipedia.org/wiki/Sense_(electronics)

   In electronics, sense is a technique used in power supplies to produce the correct voltage for a load.Although simple batteries naturally maintain a steady voltage (except in cases of large internal impedance), a power supply must use a feedback system to make adjustments based on the difference between its intended output and its actual output.

8. Measurement category - Wikipedia

   en.wikipedia.org/wiki/Measurement_category

   Category I is for measurements performed on circuits not directly connected to mains. Examples are measurements on circuits not derived from mains, and specially protected (internal) mains-derived circuits. In the latter case, transient stresses are variable; for that reason IEC 61010-1-5.4.1(g) requires that the transient withstand capabil

9. Current clamp - Wikipedia

   en.wikipedia.org/wiki/Current_clamp

   Several jaw sizes are available for clamping around large conductors and bus bars up to 4 + 1 ⁄ 2 inches (110 mm) wide. [4] As the illustration shows, the scale is very non-linear and unsuitable for measuring low currents, with currents of less than half the full-scale deflection crammed into a short section of the dial.