Here is a guide of commonly used terms in the electrical safety field and what they mean. If you have questions please contact our Applications team

Ampere (A)
Ampere is the SI base unit of electrical current, often shortened to "amp".
Cal Alert
This feature works as a reminder that calibration of the power source is coming due. It can be programmed with a date to alert the user that calibration of the power source is approaching.
An electric current is a stream of electrons moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface.
DC Bias
Also known as DC offset. This is the mean amplitude of an output waveform.
Dwell Time
The dwell time is the length of time that voltage or current is applied to test a product.
Frequencey Sweep
Conducted to evaluate the compliance of a system or a device with specified functional requirements.
Functional Run Test
Conducted to evaluate the compliance of a system or a device with specified functional requirements.
Ground Bond Test / Earth Bonding / Earth Impedance
A test used to verify that the safety ground circuit of a product has a low enough impedance to handle any fault current to ground. High current flows from the ground pin of the product's line cord and through the chassis in order to determine if the cabling is capable of handling excessive current flow should a fault occur. Verifies the integrity of a ground connection.
Ground Continuity Test
A test used to determine if the safety ground circuit of a product is continuous and intact. A low voltage is applied from the chassis of the product to the ground pin to determine if the ground circuit is continuous. Verifies the existence of a ground connection.
Impedance / Resistance (Ω)
Impedance is the effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance.
Inrush Current 
Maximum instantaneous input current drawn by an electrical device when it is powered on.
Insulation Resistance (MΩ or GΩ)
A test that stresses a products insulation with DC high voltage and measures the resistance of the insulation.
Leakage Current (µA or mA)
Leakage current is the current that flows from either AC or DC circuit in equipment to the chassis, or to the ground, and can be either from the input or the output.
Line Leakage Test / Leakage Current Test
The Leakage Current Test is used to measure undesired leakage current that is flowing through the insulation of a device while it is operating. Performing this test ensures that device leakage is minimal and will not pose a shock hazard.
Max Resistance
Max Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance measurements are normally taken to indicate the condition of a component or a circuit. Resistance equals volts / amps.
Ohm (Ω)
The SI unit of electrical resistance, expressing the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt.
Personal Protective Compatibility
Our testers are configured to work with a variety of PPE accessories. 
Personal Protective Equipment (PPE)
Our variety of personal protective equipment accessories will protect workers and keep the workstation safe while meeting all requirements. 
PLC Remote Inputs and Outputs
Provides basic PLC functionality for remote control of TEST, RESET, and REMOTE INTERLOCK DISABLE functions, as well as MEMORY SELECTION. Allows for connecting PPE's for a safe workstation setup.
Programmable Memory
Our power sources are equipped with onboard memory that can be programmed with test settings. These settings are saved and can be easily retrieved anytime.
Ramp is the manner in which the voltage increases or decreases linearly with time.
RMS and Peak Readings
Measure RMS or Peak values.

Safety Interlock
All of our power sources are equipped with a Safety Interlock function. The Interlock function utilizes a set of closed contacts to enable the instrument’s output. If the Safety Interlock contacts are open the output of the power source will be disabled. To disable the Safety Interlock function connect the Interlock Key into the Signal Input port located on the back of the power source.

Security Access
Memory lock and password access to prevent unauthorized changes to test and system parameters.

Security Feature
All of our power sources come standard with a security feature to allow users to be setup with access levels and username/password requirements.

Single Step
A function that allows you to run one test step at a time from a sequence of tests.

Touch Current (µA or mA)
Touch Current is electric current through a human body or an animal body when it touches one or more accessible parts of an installation or of equipment.
A temporary and unwanted change in the output voltage of a power source. Used in a power source to simulate unwanted power conditions.
Voltage (V)
Voltage is an electromotive force or potential difference expressed in volts. Voltage equals current x resistance.
Voltage Dip

A voltage drop from its normal level to a lower voltage. Often referred to as a "brown out" condition.

Voltage Surge
A voltage spike from it's normal level to a higher voltage. Simulates an increase in voltage in a power grid.

Voltage Sweep 
Output an increasing or decreasing range of voltage values over a period of time.