|
Find electrical test equipment terms....
Please select the letter of the term you wish to view, or scroll through our list of electrical test equipment terms.
- S -
Single Fault Condition
Condition in which a single means of electrical safety protection is defective or an abnormal condition is present. Examples of a single fault condition would be interruption of the ground conductor on a Class I product or opening of the neutral supply conductor to the product.
Source Impedance
The impedance of the measuring instrument applied to the input terminals of the device under test (DUT). If 1V is the programmed voltage and the source impedance is 25 ohms, DUT is 25 ohms, then the voltage at the DUT is 0.5V.
Related to “Source Impedance”:
LCR Meter with Programmable Source Impedance
Step
Most electrical safety testers can perform tests in a sequence. The step number indicates in which order the tests will be performed. For example if step 1 is a ground bond test, step 2 an AC hipot and step 3 an insulation resistance measurement, then when a test is started the electrical safety analyzer will perform a ground bond test followed by an AC hipot, and then an insulation resistance measurement.
-T -
Test and Measurement Equipment
Analyzers, meters and measuring instruments used to test, analyze, calibrate, control and record data in laboratory and testing situations.
Type
Test A one-time test to verify adequacy of the design of a product to meet a safety standard.
- U -
UL
Underwriters Laboratories, Inc., an NRTL located in Illinois.
Related to “UL”:
UL Public Seminars
- V -
Voltage
The electrical potential applied to a circuit.
Voltage Converter
Voltage converters convert voltage but not cycles. Most countries operate in 110V / 60Hz or 220 / 50 Hz. A voltage converter will either step up, or step down the voltage. The cycles or Hz is not affected or converted when a voltage converter is used.
Related to "Voltage Converter":
AC Power Source
DC Power Source
- W -
Watt
A watt is a unit of measurement for power. One watt (W) is the equivalent to one joule of energy per second.
Watthour
A watthour (Wh) is one Watt of hour supplied or drawn for a period of one hour.
Waveform
The instantaneous value of a variable such as voltage or current plotted against time.
- X -
X (Reactance)
Reactance is the imaginary component of Impedance.
- Y -
Y (Admittance)
Admittance is the reciprocal of Impedance. Y = 1/Z
- Z -
Z (Impedance)
Impedance is the sum of alternating current oppositions (capacitive reactance, inductive reactance and resistance). Z = R + jX
Zero Offset
A correction for residual resistance resulting for the test leads and connection. Determined by a SHORT routine with the Kelvin lead test points shorted together.
|
