Noiseken INS-4020 Impulse Noise Simulator

The NoiseKen INS-4020 Noise Simulator is a further development of the INS series simulators designed for greater ease of use, durability and reliability with new technology specifically applied to this new product. The most significant addition is automatic ramp operation in output voltage, pulse repetition period and phase angle placement.

Complementary to the IEC61000-4-4, EFT/Burst test the NoiseKen INS-4020 with unique valuable features and capabilities, most of which are not met by Electrical Fast Transient/Burst generators, greatly helps to enhance your test program to ensure your products are really immune from real world phenomena.

INS SERIES ELECTRICAL SCHEMATIC

PULSE GENERATION PRINCIPLE

The main components of the pulse generator circuitry of this unit are coaxial cables, HV power supply, charging resistor, mercury relay, and terminating resistor. The coaxial cables form a distributed constant circuit consisting of the inductance of the inner conductor and capacitance between the inner and outer conductors. When this line is terminated by a 50Ω resistance, it works as a square wave pulse generator. Pulse widths vary depending on the delay time of the coaxial line (length of the cable). The proportion of pulse widths to the length is approximately 10 ns per meter. Pulse waveforms and amplitudes depend on the relation between terminator resistance and coaxial cable characteristic impedance.
The HV power supply charges up the capacitance component of the coaxial line through the charging resistor when the mercury relay is in off status. The stored energy is discharged when the mercury relay contacts turn on, generating a HV square wave pulse across the 50Ω terminating resistor. The injection unit couples this pulse through a capacitor to an EUT LINE. Also provided is a decoupling circuit consisting of an inductor and a capacitor, working as a high impedance circuit when seen from the injection point. This enables the unit to effectively couple the interference signals to the EUT and to reduce their leakage into the power supply side (LINE IN).

FOR PERFECT MATCHING

Pulse waveforms and amplitudes are dependent on the value of a termination resistor being connected to the PULSE OUT terminal. The figures and equation shown at the right show their relations. To generate square wave pulses, this unit adopts a 50Ω(strictly, 53.5Ω resistance ), an equal value to the characteristic impedance of the coaxial cables.