Agilent/Keysight 1651A

The Agilent/Keysight 1651A is a 32-channel logic analyzer engineered for state and timing analysis of digital circuits and microprocessor-based systems. The instrument delivers flexible configuration options - single state analyzer, single timing analyzer, or concurrent state and timing operation - making it adaptable to diverse debugging workflows. With integrated pattern generation, oscilloscope capability, and comprehensive triggering, the 1651A isolates complex digital faults across 8-, 16-, and 32-bit processors.

Technical Specifications

Analysis Channels & Memory

• 32 analysis channels with 1k deep memory


• State analysis: 25 MHz maximum clock rate


• Timing analysis: 100 MHz maximum clock rate


• Glitch detection on all channels; minimum detectable glitch width 5 ns at threshold


• Transitional timing on all channels for capture of infrequent events Triggering & Display


• Complex state triggering: sequence levels, pattern recognizers, range recognizers, storage qualification


• State display modes: Compare, Chart, Waveform Pattern Generation & Oscilloscope


• Up to 204 channels of pattern generation at 50 Mbit/s


• Up to 8 channels digitizing oscilloscope capability at 400 Msample/s Microprocessor Support

Compatible with most popular 8-, 16-, and 32-bit microprocessors. Preprocessor interfaces available for standard CPUs; user-definable interface (HP 10320C) for custom architectures.

Key Features

• Interactive user interface with Auto-Scale for rapid timing analyzer and oscilloscope setup


• Rotary knob control for quick value entry and marker positioning


• Built-in disc drive for setup storage and measurement archival


• RS-232C and HP-IB interfaces for programming and data transfer


• External trigger BNC connector


• Compact 22 lb footprint with built-in handle; optional soft carrying case

Typical Applications

• Microprocessor and digital system debugging


• State sequence and timing correlation analysis


• Glitch detection and transient event capture


• Real-time pattern generation and stimulus

Compatibility & Integration The 1651A integrates into the HP 16500A Logic Analysis System (five card slots with Intermodule Bus for time-correlated multi-card measurements). Companion software converts acquired state data to microprocessor mnemonics. HP 10390A System Performance Analysis software provides State Histogram, State Overview, and Time Interval measurements.