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# Glossary

Name
Definition
Reference
Voltage (V)
Voltage(symbol: V), also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field.
Voltage AC
Voltage(symbol: V), also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field.
Current ( I )
An electric current is a flow of electric charge. The common symbol for current is the uppercase letter I. The SI unit for measuring an electric current is the ampere(A), which is the flow of electric charge across a surface at the rate of one coulomb per second. The particles that carry the charge in an electric current are called charge carriers.
DC Current
An electric current is a flow of electric charge. The common symbol for current is the uppercase letter I. The SI unit for measuring an electric current is the ampere(A), which is the flow of electric charge across a surface at the rate of one coulomb per second. The particles that carry the charge in an electric current are called charge carriers.
AC Current
An electric current is a flow of electric charge. The common symbol for current is the uppercase letter I. The SI unit for measuring an electric current is the ampere(A), which is the flow of electric charge across a surface at the rate of one coulomb per second. The particles that carry the charge in an electric current are called charge carriers.
Resistance (R)
Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm(Ω)
Capacitance ( C )
Capacitance is the ability of a component or circuit to collect and store energy in the form of an electrical charge. The SI unit of capacitance is the farad (symbol: F), named after the English physicist Michael Faraday. A farad capacitor, when charged with 1 coulomb of electrical charge, has a potential difference of 1 volt between its plates.
Buzzer
In electronics, a continuity test is the checking of an electric circuit to see if current flows . A continuity test is performed by placing a small voltage across the chosen path. If electron flow is inhibited by broken conductors, damaged components, or excessive resistance, the circuit is "open".
Diode
A diode is a specialized electronic component with two electrodes called the anode and the cathode. Most diodes are made with semiconductor materials such as silicon, germanium, or selenium. The fundamental property of a diode is its tendency to conduct electric current in only one direction. When the cathode is negatively charged relative to the anode at a voltage greater than a certain minimum called forward breakover, then current flows through the diode. If the cathode is positive with respect to the anode, is at the same voltage as the anode, or is negative by an amount less than the forward breakover voltage, then the diode does not conduct current. This is a simplistic view, but is true for diodes operating as rectifiers, switches, and limiters. The forward breakover voltage is approximately six tenths of a volt (0.6 V) for silicon devices, 0.3 V for germanium devices, and 1 V for selenium devices.
Autoranging
Automatic switching of a multirange meter from its lowest to the next higher range, with the switching process repeated until a range is reached for which the full-scale value is not exceeded. Automatic switching of a multirange meter from its lowest to the next higher range, with the switching process repeated until a range is reached for which the full-scale value is not exceeded.
Auto Power Off
Auto Power Off function shutting down the device after a certain inactivity time.
Display Backlight
Rear screen illumination is an important advantage for any device that owns it. Thanks to it, the visibility and legibility of the screen is increased, thus the device is much more subtle and reliable in small ambient light and long-term use.
Duty Cycle
Duty cycle is the proportion of time during which a component, device, or system is operated. The duty cycle can be expressed as a ratio or as a percentage. Suppose a disk drive operates for 1 second, then is shut off for 99 seconds, then is run for 1 second again, and so on. The drive runs for one out of 100 seconds or 1/100 of the time, and its duty cycle is therefore 1/100, or 1 percent.
Low Battery
The indication for low battery level is a useful feature and alert the user when needed battery unit to be changed. So you will still have a functioning device for use.
Data Hold
Data hold function is useful when measurements occur. So when pressing the "HOLD" button you will hold the display information.
Temperature (°F/°C)
Temperature measurement is done in degrees (°). The unit of measurement adopted by SI is Celsius (° C), but it can also be measured in Fahrenheit (° F). The freezing point of 0 °C = 32 °F and the boiling point 100 °C = 212 °F.
Maximum Measurement
The "MAX" function shows the highest value reached during the measurement.
NCV
Non contact voltage, NCV tester is a useful tool for any kind of electrical work - there is no quicker or simpler way to safely check for electrical current in a wire, outlet, switch or an old lamp that has mysteriously stopped working.
Smart
Automatic detection and visualization of dimensions such as: AC / DC voltage, resistance, continuity, etc.
MAX/MIN
Press the MAX/MIN key to show the maxinum reading value among measuring data, and the “MAX”symbol appears on the display. Press the button again, the “MIN” symbol appears on the display and will show the minimum reading value among measuring data, press the button again to return to normal mode.
USB interface
The USB interface allows the device to be connected to other devices and thus enables the exchange of data and values of the measured quantities.
Average value
AVG function shows the average of the measurements.
Laser
The device has a laser.
Infrared Thermometer
With IR thermometers, you can easily and quickly make temperature measurements without having to touch the subject.
Data Logging
This feature allows you to store measurement data in your device.
Diferential calculation
The device has a differential calculus function.
LED indicator
The device has a built-in LED indication with a variety of uses.
Inrush Current
A feature that enables the device to measure a Inrush Current.
Work Light
Integrated work light, which provides extra convenience when working in environments with insufficient ambient light.
Ralative Measurement
Function to display a relative measurement value.
Zero Calibration
The device has a zero calibration function.
TRMS
True Root Mean Square
Logical Level Test
The appliance has a logic level test function.
Network Cable Check
Network Cable Check Function.
Phone Check
Function for Phone Check.
Tone Tester
Function for testing of communication networks with tone signal.
Wireless
Wireless signal for data transmission or signal analysis.
Battery Test
The battery test is a convenient function for detecting the performance of different types of batteries.
Relative Humidity (%RH)
The ratio of the actual amount of water vapor present in the air at a given temperature to the maximum amount that the air could hold at that temperature. Relative humidity is expressed as a percentage. From 0% which indicates the air is absolutely dry to 100% which indicates the air is saturated.
illuminance
Illumination - The device uses a built-in sensor.
Sound measuring
The meter reads noise in factories, schools, offices, airports, and more. It can also be used to check the acoustics of studios, scenes and sound system installations.
Transistor hFE
Transistor-check function. hFE of a transistor is the current gain or amplification factor of a transistor.
Frequency
Frequency describes the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz (Hz ), corresponding to one crest per second. The frequency of a wave can be calculated by dividing the speed of the wave by the wavelength.So if the time it takes for a wave to pass is is 1/2 second, the frequency is 2 per second. If it takes 1/100 of an hour, the frequency is 100 per hour.
Tenperature (°C)
Temperature measurement is done in degrees (°). The unit of measurement adopted by the SI system is Celsius (° C), the freezing point of water is 0 ° C and the boiling point is 100 ° C.
Ground Fault Circuit Interrupter
Ground Fault Circuit Interrupter is a device that shuts off an electric power circuit when it detects that current is flowing along an unintended path, such as through water or a person. It is used to reduce the risk of electric shock, which can cause the heart to stop or cause burns. They can also prevent some fires, like when a live wire touches a metal conduit. Trip Current ：4~6mA (for standard) Trip Time ：25ms (for standard)
Low-Z (Dual Impedance Characteristics)
Normal impedance(10M) with normal testing capabilities. Low impedance Lo-Z for testing where “ ghost voltage” may be present. lf this possibility exists，or when testing for the presence of voltage，use the Lo-Z mode to switch to the low impedance setting to remove the ghost voltages during measurement.
LED Light source
L.S. allows measurement of LED light sources.
Peak Value
The "PEAK" function enables the instrument to measure peak values.
2-pole Measurement
2-pole measurement mode.
3-pole Measurement
3-pole measurement mode.
Residual Current Device
Residual Current Device is a device that shuts off an electric power circuit when it detects that current is flowing along an unintended path, such as through water or a person. It is used to reduce the risk of electric shock, which can cause the heart to stop or cause burns. They can also prevent some fires, like when a live wire touches a metal conduit. Trip Current ：5~30mA (for standard) Trip Time ：25~40ms (for standard)
RS232 Interface
The device has a communication RS232 interface.
Inductor
An inductor , also called a coil or reactor, is a passive two-terminal electrical component that stores electrical energy in a magnetic field when electric current is flowing through it. An inductor typically consists of an electric conductor, such as a wire, that is wound into a coil. When the current flowing through an inductor changes, the time-varying magnetic field induces a voltage in the conductor, described by Faraday's law of induction. In the SI, the unit of inductance is the henry (H). Inductors have values that typically range from 1 µH (10−6H) to 1 H.
Dielectric Absorption Ratio
Dielectric Absorption Ratio
Polarization Index
Automatic calculation of Polarization Index
Lock Function
Lock function on the device.
Revolutions Per Minute
RPM represents the number of complete finishes made around an axis. Used to measure the speed of rotation of various mechanical parts.
Humidity
A moisture measurement function, which is the amount of water vapor in the air and a very significant feature of the climate.
Electric Shock Warning
The device has a function for Electric Shock Warning.
Mute
The device has a mute function.
Battery Indicator
The device has an Battery capacity indicator.
A/C Weighting
A and C frequency weighing modes.
Fast / Slow
Fast / Slow Measurement function
4-pole measurement
4-pole measurement
2-Pole (resistance AC) mode.
2-Pole (resistance AC) mode.
2/4-Pole (DC resistance)
2/4-Pole (DC resistance) mode.
Clamp current
The device has clamps for non-contact measurement of values.
Wire Compensation
Wire Compensation mode (RK).
Clock
The device has a clock to display or measure the time.
Cubic Feet per minute
The unit measures the amount of air in cubic feet passing in one minute.
Cubic meter per minute
The unit measures the amount of air in cubic meters passing in one minute.
Cubic meter per second
The unit measures the amount of air in cubic meters passing in one second.
Feet Per Second
Wind speed - feet per second (ft/s).
Kilometers Per Hour
Speed measurement in the SI system is measured in meters per second (m / s), but a fairly common measurement unit is also kilometer per hour (km / h).
Knot
Knot is a unit of velocity equal to one nautical mile traveled in one hour and denoted by (kn) or (kt)
Meter Per Second
Speed measurement in the SI system is made in the unit of measure meters per second (m / s), which is the distance of one meter in one second.
Mile Per Hour
Miles per hour is the rate unit commonly used in the United States and the United Kingdom, it is expressed in terms of the number of land miles per hour.
Feet Per Minute
Speed measurement - feet per minute.
Self-check
Self-Check Function
Power factor
The power factor (PF) of an AC source is the ratio of active power to full power in watts. Power factor accepts value from 0 to 1.
Active power
Active power is the power consumed that is used in the electrical circuit and is measured in kW or MW.
Active energy
The unit has an active energy measurement function.
Аpparent power
The appliance has a function for measuring apparent power.
Reactive power
The unit has a reactive power measurement function.
Incorrect plug warning
The appliance has a signaling function for incorrect connection.
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