The HP 5334A and HP 5334B are Universal Counters capable of measuring up to 100 MHz. With the optional C Channel this capability is extended to 1.3 GHz. The instrument's basic measurement functions include Frequency, Period, Time, Time Delay, Ratio, and Totalize. The resident Multiple Register Counter (MRC) and three single chip microprocessors used to generate data, compute and display answers, expand the usefulness of the counter by providing post measurement data manipulation. This allows the additional power and convenience of user-defined measurement function keys for Math Functions, Pulse Width, Rise/Fall Time, and voltage peaks of the input signal; and the Model HP 5334A includes a nonvolatile memory that provides the capability to save and recall up to nine different front panel setups (the Model HP5334B does not contain the nonvolatile memory feature). Expanded Universal Counter Capability for Bench or System - Rise/fall time, pulse width measurements at the push of a button. - Measure the ac/dc voltage of the input signal. - Offset, normalize, and average measurements for greater usability of results. - Auto triggering and auto attenuation for user convenience. As well as - 100 MHz frequency and period measurements with resolution of 9 digits per second of gate time. - Time interval and time interval delay to 2 ns resolution, 200 ps with averaging. - Full HP-IB programmability standard with optional rear inputs for system applications. Make up to 140 readings per second. - 1.3 GHz C Channel, MATE Interface, and High Stability Oven Time Base options. - External arming/gating for synchronizing measurements to external events.