Keysight (Agilent) 1661C Timing Benchtop Logic Analyzer, 102-Channel, 100 MHz State/500 MHz

The Keysight (Agilent) 1661C is a benchtop logic analyzer purpose-built for debugging and characterizing digital circuits and systems. It delivers 102 channels of simultaneous capture with dual-mode analysis capability: 100 MHz state analysis across all channels and 500 MHz timing analysis with 2 ns resolution. Engineers gain access to sophisticated triggering with 12 levels of state sequencing and 10 levels of timing sequencing, supporting edge, pattern, glitch, and setup/hold violation detection via graphical trigger macros.

The instrument integrates Ethernet LAN connectivity (Option 15) alongside HP-IB, RS-232-C, and printer interfaces for data acquisition and system integration. On-board storage includes a 540 MB hard disk drive and 3.5-inch floppy drive, enabling local data management and compatibility with source line referencing workflows via the HP B3740A software analyzer. State memory depth reaches 4K per channel, expanding to 8K in half-channel modes.

Timing analysis operates at 250 MHz across all channels or 500 MHz on half-channel configurations, with transitional and glitch modes available at 125 MHz and 250 MHz respectively.

Technical Specifications

• Channels: 102 (state and timing) or 96 data + 6 clock/data channels


• State Analysis: 100 MHz across all channels; 6 clocks/qualifiers


• Timing Analysis: 500 MHz conventional rate, 2 ns resolution


• Timing Speeds: 250 MHz (all) / 500 MHz (half); 125 MHz transitional (all) / 250 MHz (half); 125 MHz glitch (half)


• Memory: 4K states per channel; 8K states in half-channel modes


• Triggering: 12 levels state sequencing; 10 levels timing sequencing


• Interfaces: Ethernet LAN, HP-IB, RS-232-C, Centronics printer, DIN mouse and keyboard


• Storage: 540 MB hard disk; 3.5-inch floppy drive


• Data Formats: Binary, hex, octal, ASCII


• Display: CRT


• Weight: 40 lbs

Key Features

• Dual state/timing analysis modes for comprehensive circuit characterization


• Graphical trigger macro configuration simplifies complex trigger sequences


• System Performance Analysis (SPA) provides state histograms, overviews, and time interval measurement


• HP E2450A Symbolic Download Utility extracts symbolic debugging information


• Source line referencing correlates high-level code with assembly via HP B3740A software

Typical Applications Digital circuit debugging, system-level timing validation, protocol analysis, and processor/microcontroller characterization.

Compatibility & Integration 1660C/CS/CP-Series compatible. Supports HP B3740A software analyzer for advanced source correlation workflows.