Keysight (Agilent/HP) 1645A

For testing data lines for serial data transmission according to RS-232 and CCITT standard. Bit rate internally 75, 150, 200, 300, 600, 1200, 1800, 2400, 3600, 7200, 9600 or externally up to 5 MHz. Error indication on LED display. Inputs and outputs TTL-compatible as well as connections according to CCITT-V-24 standard, printer connection. DATA LINE TESTER