Acclima - Models TDR305H, TDR310H and TDR315H - TDR Sensor - User Manual

Acclima’s TDR Sensors are Integrated Time Domain Reflectometers that contain an ultra-fast step function generator, an ultra-fast waveform digitizer and a precision time base. The step function generator and waveform digitizer are connected directly to a waveguide of length 5 cm, 10 cm or 15 cm without an intervening coaxial cable. The key to their operation is a patented waveform digitizing hardware and firmware set that has an effective digitizing rate of 200 billion samples per second. The step function generator launches a voltage step on the waveguide with a 20%/80% rise time of 150 trillionths of a second. The digitizer acquires a digital image of the incident wave and its returning reflections with 5 trillionths of a second resolution. The image is then analyzed to determine the roundtrip propagation time between the incident wave and the first reflected wave.