Agilent/Keysight 8151A – Optical Multimeter

The Agilent/Keysight 8151A Optical Multimeter measures peak and average optical power in fiber optic components, modules, and systems. It characterizes signal amplitude, mean power, and extinction ratio, with direct electrical output corresponding to the optical input waveform. Operation requires a separate optical head (81511A or 81512A), enabling wavelength coverage from 550 nm to 1725 nm.

Technical Specifications

• Peak and average optical power


• Amplitude, mean power, and extinction ratio


• O/E transducer capability with 250 MHz transducer frequency range


• Power resolution: 3 digits (1 pW minimum) in watts; 4 digits (0.01 dB minimum) in dB Analog Output


• Bandwidth: DC to 300–1000 Hz (depending on range and optical head)


• Output voltage: 0–2 V into open circuit


• Output impedance: 600 Ω typical


• Maximum input voltage: ±10 V


• Output attenuation: 0 dB to 6 dB in 0.1 dB steps


• All output signals: pulse-shaped, 50% duty cycle Internal Modulation


• Selectable frequencies: 270 Hz, 1 kHz Optical Heads (sold separately)


• 81511A: 550–950 nm (calibrated 850 nm), +10 dBm to -60 dBm, 200 µm maximum core


• 81512A: 900–1725 nm (calibrated 1300 nm), 0 dBm to -50 dBm, 100 µm maximum core

Key Features

• Interchangeable optical heads enable wavelength flexibility from 550 to 1725 nm


• HP-IB interface support with standard functions (SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, CO)


• Wide measurement dynamic range across both visible and near-infrared bands


• Direct transducer output for external signal analysis

Physical & Environmental

• Main unit: 140 mm H × 220 mm W × 530 mm D; 8 kg net


• Operating temperature: 0°C to +55°C


• Storage temperature: -40°C to +70°C


• Humidity: 95% RH (0°C to +40°C)


• Power: 100/120/220/240 Vrms ±5%, 48–66 Hz, 100 VA maximum

Compatibility & Integration HP-IB remote control enables integration with automated test systems. Optical head selection determines wavelength range and measurement dynamic range for specific applications.