Immunity Testing Services
Our Electro-static Discharge Immunity is a high voltage, low current impulse applied to a device simulating the effects of walking across a carpet and touching a door knob. Our test capability is up to 8 kV for contact discharge both direct and indirect coupling planes and at levels up to 15 kV for Air Discharge.
Radiated Radio Frequency Immunity is the generation of an amplitude modulated radio frequency signal over the range of 80 to 6000 MHz simulating broadcast transmissions that can occur during the products usage. We can generate fields up to 20 V/m across the entire range. Frequencies are stepped from the beginning frequency at 1% increments to the end frequency with 80% Amplitude Modulation or 50% Pulsed Modulation as required.
Immunity is the simulation of mechanical contacts opening and closing. Examples are circuit breakers in electronic equipment, AC Switchgear, and switching of inductive loads. A 5 nS on, 50 nS off waveform is applied at a 5 kHz repetition frequency at levels up to 4 kV on AC Power, DC Power, I/O cables longer than 3 Meters. On AC Mains and DC inputs the test is performed common mode (all wires simultaneously), and for I/O cables the test is performed via a capacitive coupling clamp. The test is typically performed for a duration of 1 minute at each of the voltage levels. 100 kHz repetition frequency is also available up to 2.5 kV.
Lighting Surge Immunity is the simulation of a Lightning Strike on a power circuit within a building, including both common mode and differential mode at several voltage levels. Levels up to 4 kV can be applied from Line to Line and applied from each Line to Ground positive and negative polarities at various phase angles of the line frequency. The typical waveform consists of a 1.2 µS rise time with a 50 µS decay to half voltage. A minute recovery time between strikes provides protection devices sufficient time to cool prior to the application of the next strike. I/O Lightning Surge up to 2 kV on long data cables over 30 meters for either indoor or outdoor applications is performed via coupling/decoupling networks using either 1.2 x 50 µS or 10x700 µS waveforms.
Conducted Radio Frequency Immunity is the generation of an amplitude modulated radio frequency signal over the range of 100 kHz to 230 MHz and is applied directly to power and IO cables. A level up to 10 Vrms is applied to AC Power, DC Power Inputs, I/O and Signal Cables longer than 3 Meters. Frequencies are stepped from the beginning frequency at 1% increments to the end frequency. Typical range is 150 kHz to 80 MHz.
Power Frequency Magnetic Fields Immunity is the generation of 50 and 60 Hz Magnetic Fields, typically by the use of a Helmholtz Coil in which the product is centered within 3 different axis. Levels up to 100 A/m is generated at 50 and 60 Hz frequencies on any equipment which is magnetically sensitive such as Hall Effect sensors, CRTs, etc.
Voltage dips, short interruptions and voltage variations is the simulation of voltage removed from the line based upon a percentage and a time frame, measured in cycles of the 50 or 60 Hz line frequency, to see how the product accepts these variations in power delivered to the product. Various percentage dips are performed, typically at 0 and 180 crossing points of the line frequency. Dips can also be performed at 45 degree increments for short variations. In addition a >95% to 100% removal of the power line voltage for 5 seconds (250/300 cycles) is performed as an interruption in power.