Agilent / Keysight N7745C Optical Multiport Power Meter, 8 channels

The Keysight N7745C is an eight-channel optical multiport power meter designed for parallel, high-speed measurement of optical devices and systems. It acquires data at up to 1 million samples per second per port across all channels simultaneously, enabling rapid characterization of multiplexers, PON splitters, wavelength selective switches, and ROADMs in both R&D and manufacturing. The instrument employs dual-ported RAM architecture to decouple measurement from readout, eliminating test delays.

Power threshold triggering supports transient capture, while external trigger inputs (TTL, BNC) enable synchronization with external test events. The half-rack form factor occupies minimal bench space, consuming only 60 VA maximum with all options installed.

Technical Specifications

• Channels: 8 independent measurement ports


• Sensor Type: InGaAs with optional filter configurations


• Wavelength Range: 1250 nm to 1650 nm (standard); 800 nm to 1650 nm or 800 nm to 1700 nm (optional)


• Power Measurement Ranges: –80 dBm to +10 dBm (standard); –70 dBm to +20 dBm or –110 dBm to +10 dBm (optional); –60 dBm to +10 dBm (under defined conditions)


• Measurement Uncertainty: ±2.5% at reference conditions


• Dynamic Range: 65 dB in swept and logging modes without ranging


• Polarization Dependence: <±0.01 dB (typical)


• Data Acquisition Rate: 1 million samples/second per port


• Minimum Averaging Time: 1 µs


• Bandwidth: 250 kHz maximum


• Memory: 1 M samples per port plus 1 M per port buffer for continuous logging


• Data Transfer Speed: 3× faster than previous generations


• Power Input: 100 V to 240 V AC, 50/60 Hz, ±10% maximum variation


• Dimensions: 12 × 10 × 8 inches


• Weight: Approximately 10 lbs


• Operating Temperature: 5°C to +40°C

Key Features

• Simultaneous eight-port measurements minimize test cycle time


• Power threshold triggering for event-based transient capture


• External TTL trigger I/O (BNC connectors) for system integration


• Rapid measurement throughput via optimized data interfaces


• LAN, USB, and GPIB control interfaces for flexible instrument integration

Typical Applications

• Multi-channel optical component characterization


• Wavelength-division multiplexing (WDM) system validation


• PON network component testing


• ROADM and WSS performance verification

Compatibility & Integration Compatible with Keysight's N77xx Viewer software. Browser-accessible user interface via LAN or USB connection supports remote operation and data logging.