The Keysight N1055A is an electrical remote sampling head module delivering TDR/TDT measurement capability for the 86100D DCA-X mainframe. This module enables fast, accurate impedance characterization and S-parameter analysis on high-speed interconnects through integrated step generation, sampling, and diode limiting circuits. Available in 35 GHz and 50 GHz bandwidth options with 2-port or 4-port channel configurations, the N1055A supports single-ended, differential, and common-mode stimulus modes. Up to 16 channels can be deployed per mainframe using multiple modules, making it suitable for comprehensive multi-port device characterization.
Technical Specifications
• Module Type: Electrical remote sampling head with TDR/TDT capability
• Compatibility: Keysight 86100D DCA-X mainframe; requires FlexDCA firmware version A.04.00 or above
• Bandwidth: 35 GHz or 50 GHz; upgradable from 35 GHz to 50 GHz
• Channel Configuration: 2-port or 4-port; upgradable from 2 to 4 channels; up to 16 channels per mainframe
• Edge Speed (10–90%, typical): 35 GHz: 18 ps / 15 ps / 10 ps; 50 GHz: 7 ps / 6 ps / 7 ps (characteristic)
• Remote Head Cable Length: 1270 mm
• Input Connectors: 2.92 mm or 1.85 mm (female or male); consistent across all channels per module
• Vertical Resolution: 16-bit A/D converter
• Scale Factor: 1 mV/division to 100 mV/division
• DC Accuracy (VAVG): ±800 μV (characteristic) at calibration temperature ±0.5 °C
• RMS Noise: 35 GHz: 600 μV (characteristic); 50 GHz: 750 μV (maximum)
• Intrinsic Jitter: <100 fs rms (with 86107A or 86100D-PTB precision timebase)
• TDR Step Rise Time: As fast as 6 ps (50 GHz option)
– Key Features
• Full S-parameter analysis from DC to 50 GHz; Touchstone export capability
• Impedance measurement with discontinuity location and characterization
• Time-domain transmission measurements: step response, propagation delay, propagation velocity, rise-time degradation, NEXT, FEXT, and skew
• High-performance oscilloscope receiver for waveform and jitter analysis (with 86100D-200/300)
• Ultra-fast TDR step generator providing resolution
– Typical Applications
• High-speed interconnect characterization and validation
• PCB and package transmission-line analysis
• Multi-port device S-parameter extraction
• Signal integrity and crosstalk assessment
– Compatibility & Integration
The N1055A integrates directly into the 86100D DCA-X platform, enabling scalable measurement systems. Firmware version A.04.00 or later is required.
