The Keysight N6785A is a double-wide Source/Measure Unit (SMU) engineered for precise battery drain analysis of mobile and battery-powered devices within the N6700 modular power system. It combines stable sourcing and sinking capability with a built-in digitizer that captures voltage, current, and power at ~200 kHz sampling rates, enabling real-time visibility of current drain from nanoamperes to amperes without manual range switching. The module delivers 80 W of output power across four programmable voltage ranges (6 V, 10 V, 15 V, 20 V) and corresponding current ranges (±4 A to ±8 A), with programming accuracy of 0.025% + 1.8 mV for voltage and 0.04% + 1.4 mA for current. Its programmable output resistance emulates battery internal impedance, while an auxiliary voltage measurement input (–20 V to +20 VDC, ~2 kHz bandwidth) supports battery voltage rundown studies. Output voltage ripple is held to 15 mV peak-to-peak and 1.5 mV RMS across the 20 Hz to 20 MHz band.
Technical Specifications
• Output Voltage Ranges: 6 V, 10 V, 15 V, 20 V
• Output Current Ranges: ±4 A, ±5 A, ±6.7 A, ±8 A
• Maximum Power: 80 W
• Programming Accuracy (23°C ± 5°C): Voltage 0.025% + 1.8 mV; Current 0.04% + 1.4 mA
• Measurement Accuracy: Voltage (20 V range) 0.025% + 1.8 mV; Current (8 A range) 0.04% + 1.5 mA; Current (100 mA range) 0.025% + 10 µA; Current (1 mA range) 0.025% + 100 nA
• Output Voltage Ripple & Noise (20 Hz – 20 MHz): 15 mV peak-to-peak; 1.5 mV RMS
• Digitizer Sampling: ~200 kHz rate (~5 µs intervals); 5.12 µs/sample (one parameter) or 10.24 µs/sample (two parameters)
• Auxiliary Voltage Input: –20 V to +20 VDC; ~2 kHz bandwidth
– Key Features
• Built-in digitizer for real-time logging of voltage, current, and power
• Seamless measurement ranging from nA to A without manual range changes
• 2-quadrant operation: sourcing and sinking (eLoad charging emulation)
• Programmable output resistance for accurate battery internal resistance emulation
• Programmable over-voltage and over-current protection
• Software integration with Keysight 14585A and PathWave BenchVue BV9200B for oscilloscope, data logger, and CCDF analysis
– Typical Applications
• Battery drain analysis for mobile devices and portable electronics
• Long-term power consumption profiling
• Device transient and dynamic load testing
• Battery rundown and aging simulation
– Compatibility & Integration
• Form Factor: Double-wide module (two-slot footprint)
• Mainframe Compatibility: N6700 low-profile modular power system (N6700C series) and N6705C DC power analyzer
• Programming Interfaces: GPIB (IEEE-488), LAN, USB
