The Agilent/Keysight 400GL is a precision AC voltmeter engineered for signal measurement across the 20 Hz to 4 MHz frequency band. It delivers wide dynamic range dB measurements from -100 dB to +60 dB across eight selectable ranges, with typical accuracy of ±0.4 dB. The instrument accommodates AC signals up to 1200 Vrms and DC inputs to 1000 Vdc, making it suitable for diverse RF and audio frequency applications.
Technical Specifications
• Frequency Range: 20 Hz to 4 MHz
• AC Voltage Measurement: up to 1200 Vrms
• DC Voltage Measurement: up to 1000 Vdc
• dB Measurement Range: -100 dB to +60 dB (8 ranges)
• Input Impedance: 10 MΩ
• Input Capacitance: <30 pF to <15 pF (range dependent)
• Measurement Accuracy: ±0.4 dB (typical)
• Weight: 5.50 lbs
– Key Features
• Dual-scale display: linear dB scale (100 divisions, -20 to 0 dB) and logarithmic voltage scale (0 dB = 1 V)
• Eight independent measurement ranges for optimized resolution across the -100 to +60 dB span
• High input impedance (10 MΩ) minimizes circuit loading in high-impedance applications
• Low input capacitance ensures measurement integrity at upper frequency limits
– Typical Applications
The 400GL serves applications requiring accurate voltage measurement in the audio and RF domains, including network analysis, signal tracing, and broadband frequency response characterization where dB-referenced measurements simplify gain and loss calculations.
– Compatibility & Integration
No software or system integration specifications are documented for this model. The instrument operates as a standalone AC voltmeter. Standard coaxial connectors support industry-wide test setup configurations. This model is discontinued by the manufacturer.
