The Hewlett-Packard 1630 and 1631 Logic Analyzers are Interactive state and timing analyzers for use in the design and troubleshooting of digital systems. Many functions of the systems are the same. The HP 1630A and 1631A have 27 state channels with three clocks and 8 timing channels. The HP 1630D and 1631D have an additional 8 timing channels. The HP 1630G has an additional 30 state channels. The HP 1631A and 1631D have two analog signal channels and an analog trigger channel. All models feature a menu system for defining measurements which simplifies setup time by reducing the number and complexity of front panel keys. Following is a listing of the key features of the HP 163X systems.