The Keysight 46021A is a specialized keyboard designed for direct integration with Keysight (formerly Agilent/HP) modular measurement systems. It functions as a Human Interface Link (HP-HIL) input device, connecting via proprietary HP-HIL connector to compatible instruments and displays. The keyboard maps eight function keys to softkey arrays on compatible spectrum analyzers and displays, with F1–F7 corresponding to right-hand softkeys and SHIFT+F1–F7 to left-hand softkeys. F8 (shifted or unshifted) accesses the USER softkey. Additional key mappings include MENU, System/DISPLAY, Shift+Reset/I-P, Shift+Print/PRINT, and CTRL+Shift+Print/PLOT functions.
## Technical Specifications
• **Manufacturer:** Keysight Technologies (formerly Agilent, Hewlett-Packard)
• **Model Number:** 46021A
• **Interface Type:** Hewlett-Packard Human Interface Link (HP-HIL)
• **Connector Type:** HP-HIL connector
• **Protocol:** Proprietary HP protocol; not compatible with standard PCs or Macs
• **Dimensions (L × W × H):** 20 × 10 × 4 inches
• **Weight:** Approximately 3.0 lbs
• **Cable:** RJ11 connector cable may be included with some units
## Key Features
• Eight function keys (F1–F8) with dual-layer access via SHIFT modifier
• Right-hand and left-hand softkey correspondence for efficient instrument control
• Dedicated MENU, System/DISPLAY, and USER function keys
• Shift-based access to I-P, PRINT, and PLOT functions
• Layout optimized for Keysight Modular Measurement “C” System spectrum analyzers
• Internal switch options including Fujitsu Leaf Spring (linear) and rubber dome mechanisms
## Typical Applications
Primary use with Keysight/Agilent/HP Modular Measurement “C” System spectrum analyzers for command input and parameter control. Provides intuitive operator interface for instrument configuration and data entry within compatible Keysight environments.
## Compatibility & Integration
Designed for Keysight Modular Measurement “C” System spectrum analyzers. Connects to HP-HIL ports on compatible displays such as the HP 70004A color display. Also referenced for use with HP 35721A terminals and HP 9000 series 300 and 400 systems. HP-HIL connection ensures full access to instrument capabilities through system-specific interface architecture.
