Research

Other Facilities and Capabilities

High Voltage Breakdown Testing

We can perform high voltage standoff testing with DC and pulsed voltages.  DC testing can be conducted up to 200 kV.  Pulsed voltage from 140 – 400 kV can be attained, with a typical lightning waveform – unipolar, 1.2 microsecond risetime and 50 microsecond pulse width.  Testing is conducted in humidity-controlled chambers.  Breakdown voltage and current can be measured.

Small TEM Cell

We have a small transverse electromagnetic (TEM) cell that can be used to conduct RF measurements and experiments.  Similar to our large TEM cell (EMES), it can be used for susceptibility testing or electromagnetic transfer function measurements. It has a 50-Ohm intrinsic impedance that terminates into a 50-Ohm load.   The test cell is a truncated triplate structure that produces a uniform, vertically polarized electric field inside. The dimensions are 1.2 m wide x 1.2 m deep x 0.6 m high (center plate to bottom or top).  Available sources are a 10 W amplifier from DC to 250 MHz and a 400 W amplifier from 10 kHz – 200 MHz.

Cable Test

The ACT-1 Cable Test System measures shielding effectiveness of cables, as defined by 

Formula for measuring shielding effectiveness of cables

where SE = shielding effectiveness, Ish = shield current, and Isc = inner conductor short-circuit current.

A current is applied to the shield of a cable under test and the inner conductor current is measured.  The ratio of the inner conductor current to the applied shield current is the shielding effectiveness.  To make the measurement on multi-conductor cables, all inner conductors are shorted together. The Cable Test System can measure shielding effectiveness across a frequency range of 1 – 250 MHz.