HP 3782A Error Detector

This is the error detector portion of measurement system for
testing and evaluating performance of CCITT digital transmission and terminal
equipment. Binary, code or parity errors can be measured and displayed as error
rate, error count , error sec or error-free seconds. Performs error ratio,
error count, error seconds and error-free seconds measurements. At the DS-3
level, it can perform in-service or out-of-service measurements of parity
errors within the digital transmission system.