The IIP 5372A Frequency and Time Interval Analyzer is a precision frequency and time interval measuring instrument that uses a new counting technique called "continuous measurement". This new counting technique provides contiguous frequency and time interval measurements with a wide range of arming and triggering features. Time-sampling of frequency and time interval measurements up to 13.3 MHz eliminating measurement "dead time" is attainable. Trigger events are time-stamped and stored for post-processing by a 68020 microprocessor. A special integrated circuit, called a Sequencer, controls the arming of three 32-bit count chains, each operating simultaneously and using two 16-bit Zero-Dead-Time counters (ZDTs). A new interpolation technique resolves measurements to 200 ps LSD. High-speed memory provides built-in statistical analysis capability. A front-panel CRT display allows presentation of measurement data and user-friendly interface. The HP 5372A has two independent measurement channels, A and B, and an external arming input (an optional high-frequency C-Channel is available). Arming can occur on any of the three standard inputs and can be specified by time, events, signal edge, cycle, or parity. In addition to making frequency (and period) and time interval measurements, the HP 5372A can make the following measurements: ■ Positive and Negative Pulse Width ■ Rise and Fall Time ■ Totalize ■ Phase ■ Peak Amplitude ■ Duty Cycle ■ Phase Deviation ■ Time Deviation ■ Simultaneous Dual-channel Frequency The HP 5372A can analyze measurement data to produce histograms, time variance graphs, event timing graphs, limit tests, Allan Variance, and more. Additional features include (1) HP-IB compatibility with enhanced control language, (2) CRT screen printout capability, (3) diagnostic capability accessible via the front panel, (4) statistics and math capability, (5) save and recall of instrument setups, and (6) graphics capability.