Programmable Square Wave Pulser Preamplifier for Multi-Channel Applications: The family of front-end electronic modules for the upi-50 ultrasonic instrument includes now the compact, fully programmable four-channel RPP4 pulser preamplifiers. Intended for multi-channel applications, in which size and cost are critical, the RPP4 units retain the high performance of the RPP family in terms of sensitivity and resolution. Up to four RPP4 units can be installed on-board the upi-50, or can be remotely mounted to a distance of up to 100 meters (300 ft). For details, please refer to RPP4 technical description.