Agilent/Keysight 16556A

The Agilent/Keysight 16556A is a 68-channel logic analyzer module that extends the capabilities of compatible mainframes for advanced digital system debugging and validation. This module delivers 1 Megasample per channel memory depth with dual clocking modes - state analysis at 100 MHz and timing analysis up to 500 MHz (2 ns resolution) - enabling simultaneous, time-correlated acquisition across mixed signal types. The instrument supports up to 2048 levels of sequence triggering and real-time pattern recognition, making it suitable for complex digital circuit characterization.

Technical Specifications

• Channels: 68 across 4 groups (up to 18 channels per group)


• Memory: 1 Megasample per channel


• State Clock Rate: 100 MHz maximum


• Timing Sampling Rate: 500 MHz maximum (2 ns resolution); 200 MHz full channel, 400 MHz half-channel conventional timing


• Threshold Range: -6 V to +6 V, adjustable in 50 mV increments


• Input Impedance: 100 kΩ || 8 pF


• Voltage Range: -10 V to +10 V


• Sequence Triggering: Up to 2048 levels


• Power: 100–240 V AC, 50–60 Hz


• Operating Temperature: 0°C to +50°C


• Dimensions: 180 mm H × 425 mm W × 490 mm D


• Weight: ~12 kg

Key Features

• Flexible state and timing clocking modes on all channels simultaneously


• Full time-correlation between state and timing measurements


• Real-time pattern and sequence recognition across all 68 channels


• Adjustable input thresholds for mixed-voltage system analysis


• HP-IB (GPIB) remote control and data transfer interface


• Internal storage with external memory device support

Typical Applications

• Digital design debugging and verification


• Complex digital circuit troubleshooting


• Electronic circuit validation

Compatibility & Integration Compatible with Agilent/Keysight 16700 Series and 16500C logic analysis systems. The 16700 Series requires software version A.02.70.