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home > Keysight N6781A 20 V, ±3 A, 20 W Source/Measure Unit Module > Keysight N6781A 20 V, ±3 A, 20 W Source/Measure Unit Module

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Keysight N6781A 20 V, ±3 A, 20 W Source/Measure Unit ModuleKeysight N6781A 20 V, 3 A, 20 W Source Measure Unit Module Key Features At A Glance 2 quadrant Source Measure Unit module for the N6700 Modular Power System, tuned for battery drain analysis at 20 W (20 V 6 V, 1 A 3 A) Built in 18 bit digitizers measure and log voltage, current, and power every ~5 s (~200 kHz) Seamless measurement ranging across the top three current ranges captures current from nA to A in one pass without changing ranges User

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Keysight N6781A 20 V, ±3 A, 20 W Source/Measure Unit Module

Name: Keysight N6781A 20 V, ±3 A, 20 W Source/Measure Unit Module
Brand: www.carladuclos.com
SKU: 7702409272
Price: 4608.00 USD
Availability: InStock
Rating: 4.7965 (511 reviews)

Key Features At A Glance

2-quadrant Source/Measure Unit module for the N6700 Modular Power System, tuned for battery drain analysis at 20 W (20 V / 6 V, ±1 A / ±3 A)
Built-in 18-bit digitizers measure and log voltage, current, and power every ~5 µs (~200 kHz)
Seamless measurement ranging across the top three current ranges captures current from nA to A in one pass without changing ranges
User-selectable emulation modes (power supply, CC/CV load, voltmeter, ammeter) plus battery emulator and battery charger modes; zero-burden ammeter mode supports real-world battery rundown tests
Programmable output resistance for battery emulation and an auxiliary voltage measurement input (±20 V)
N6780 Series spans 20 W to 80 W in 2-quadrant and 4-quadrant variants for combined source and sink (charge / eLoad) operation
4-wire remote sensing and programmable voltage slew rate; each module output fully isolated and floating from ground and from one another
GPIB, USB 2.0, and 10/100 Base-T LAN standard; fully compliant to the LXI Class C specification, with SCPI / IEEE 488.2 programming and VXIplug&play and IVI-COM drivers
Optional BV9200B / BV9201B PathWave BenchVue power control and analysis software (sold separately)

The Keysight N6781A is a 20 W, 2-quadrant Source/Measure Unit (SMU) module tuned for battery drain analysis, part of the Keysight N6780 Series for the N6700 Modular Power System. A source/measure unit pairs a controllable power source with integrated, high-resolution measurement in one instrument, so a device under test can be driven and characterized without a separate supply and meter. The N6780 Series combines precise sourcing, sinking, and measurement in a single unit, letting you visualize current drain from nA to A in one pass to gain insight into a device's power consumption and to optimize the battery life of battery-powered devices and their components.

The N6781A and the 80 W N6785A are tuned for battery drain analysis of battery-powered devices, including e-Book readers, MP3 players, wireless mice, mobile phones, large smartphone phablets, tablets, military radios, and pacemakers. Within the series, the N6782A and N6786A are tuned for functional test of devices such as DC/DC converters, power management units (PMUs), power management ICs (PMICs), and power amplifiers, and the N6784A is designed as a versatile 4-quadrant tool for general-purpose applications in automated test systems or on an R&D bench. These application-specific modules also serve mobile-device designers and the testing of battery-powered mobile devices in manufacturing or automated test environments.

The N6781A installs in any N6700 Series mainframe. The N6700 itself is a low-profile, 1U-high, multiple-output programmable DC power supply and electronic load system that lets test system integrators optimize performance, power, and price to match their test needs, holding one to four modules in a single 1U chassis and mixing and matching from over 30 different DC power and electronic load modules. Installed instead in the N6705C DC Power Analyzer, the same modules gain the front-panel functions of a DMM, oscilloscope, arbitrary waveform generator, and data logger, so an R&D engineer can source, load, and measure DC voltage and current into a device under test without writing code.

ValueTronics stocks and holds its own test and measurement inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Holding inventory under our own roof lets us confirm configuration and condition directly and ship quickly to the engineers, labs, and production teams who rely on us.

Brand Heritage

Keysight Technologies traces its measurement heritage to Hewlett-Packard, whose test and measurement business was spun off as Agilent Technologies in 1999. Agilent's electronic measurement division was then established as Keysight Technologies in 2014, the brand under which this product line is offered today. Documentation and ordering references issued before that transition may carry the earlier brand names.

Compare Other Models in This Series

The Keysight N6780 Series groups five Source/Measure Units for the N6700 Modular Power System, each combining a controllable source with integrated measurement. The models differ along three lines the series itself defines: output power (20 W or 80 W), quadrant operation (2-quadrant or 4-quadrant), and the application each is tuned for — battery drain analysis, functional test, or general-purpose use. The N6781A is the 20 W, 2-quadrant member tuned for battery drain analysis, supporting seamless measurement ranging across its top three current ranges, programmable output resistance for battery emulation, an auxiliary voltage measurement input, zero-burden ammeter mode for battery rundown tests, and battery emulator and battery charger emulation modes.

The N6781A, N6782A, and N6784A are 20 W modules, while the N6785A and N6786A are 80 W modules with higher current ranges. The N6784A is the only 4-quadrant model and the only one that does not support seamless measurement ranging; the N6781A, N6782A, N6785A, and N6786A are 2-quadrant units whose top three ranges do support it. Application tuning further separates the models: the N6781A and N6785A add programmable output resistance and battery emulator / charger modes for battery drain analysis, while the N6782A and N6786A add output modulation up to 100 kHz for functional test.

The wider N6700 family combines a mainframe with interchangeable DC power, high-performance, precision, source/measure, application-specific, and electronic load modules. Modules are drawn from several series: the basic N6730 / N6740 / N6770 DC power modules, the N6750 high-performance autoranging modules, the N6760 precision modules, the N6780 source/measure units, the N6783A application-specific modules, and the N6790 electronic loads. DC power modules provide general-purpose output at 50 W, 100 W, and 300 W; high-performance autoranging and precision modules extend ratings to 500 W and add autoranging output and low-range measurement; source/measure units operate in two or four quadrants at 20 W to 80 W; the application-specific N6783A modules target battery and mobile-communications testing at 18 W to 24 W; and the electronic load modules absorb rather than source power at 100 W and 200 W input ratings, offering up to 200 W, 60 V, and 40 A with constant voltage, current, resistance, and power modes and programmable slew rates. Across the DC power modules, output ratings span 5 V to 150 V and 18 W to 500 W per module.

Mainframes are available in 400 W, 600 W, and 1200 W total-output-power tiers (the N6700C, N6701C, and N6702C low-profile mainframes; the earlier N6700B, N6701A, and N6702A carry the same tiers). The N6705C DC Power Analyzer is the four-slot mainframe at the center of the bench system, providing 600 W of total available power, while the N6715C is the same system ordered as a fully assembled, build-to-order instrument with one to four modules pre-installed. The same modules also run in the low-profile mainframes used for ATE, allowing test correlation between bench and manufacturing setups. Most modules occupy a single slot, while the higher-power N6753A–N6756A, N6763A–N6766A, N6785A–N6786A, and N6792A modules occupy two of the four slots.

Each new model linked below is its own dedicated product page with condition-matched pricing. Select the specific mainframe or module that fits your channel count, output rating, and interface needs, and review that page for its availability and price. The comparison table below summarizes the key ratings for the N6781A alongside representative family members.

Model	Application	Quadrants	Max Power
N6781A	Battery Drain Analysis	2-Quadrant	20 W
N6782A	Functional Test	2-Quadrant	20 W
N6784A	General Purpose	4-Quadrant	20 W
N6785A	Battery Drain Analysis	2-Quadrant	80 W

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

N6781A Specification	Value
DC Output Ratings
Voltage	20 V / 6 V
Current (derated 1% per °C above 30 °C)	±1 A / ±3 A
Power	20 W
Operation	2-quadrant
Auxiliary Voltage Measurement Input	±20 V
Output Voltage Ripple & Noise (PARD) (20 Hz – 20 MHz, at full load)
CV peak-to-peak	12 mV
CV rms	1.2 mV
Load Effect (Load Regulation)
Voltage, 20 V & 6 V ranges	700 µV, 400 µV
Current, 3 A & 1 A ranges	100 µA, 50 µA
Programming Accuracy (23 °C ±5 °C, after 30 min warm-up)
Voltage, 20 V range	0.025% + 1.8 mV
Voltage, 6 V range	0.025% + 600 µV
Voltage, 600 mV range	0.025% + 200 µV
Current, 3 A & 1 A range	0.04% + 300 µA
Current, 300 mA range	0.03% + 150 µA
Resistance (in 20 V output range)	0.1% + 3 mΩ
Resistance (in 6 V output range)	0.1% + 1.5 mΩ
Measurement Accuracy (23 °C ±5 °C)
Voltage, 20 V range	0.025% + 1.2 mV
Voltage, 1 V range	0.025% + 75 µV
Voltage, 100 mV range	0.025% + 50 µV
Auxiliary Voltage Measurement Input	0.025% + 5 mV
Current, 3 A range	0.03% + 250 µA
Current, 100 mA range	0.025% + 10 µA
Current, 1 mA range	0.025% + 100 nA
Current, 10 µA range	0.025% + 8 nA
Load Transient Response Time (Voltage Priority Mode)
Rise time (10% to 90%)	10 µs
Settling band, 20 V range with 0.8 A load step	±10 mV
Settling band, 6 V range with 1.4 A load step	±20 mV
Recovery time	≤ 35 µs
Over-Voltage Protection
Accuracy	0.05% + 20 mV
Maximum setting	24 V
Supplemental Characteristics — Source Effect (Line Regulation)
Voltage	300 µV
Current	60 µA

The N6781A's specification values shown above are for the highest output and measurement range; the module has multiple ranges. The condensed family-level specifications below place the N6781A in the context of representative DC power modules across the N6700 series.

Model	DC Output Ratings (V / A / W)	Ripple & Noise (p-p / rms)	Voltage Programming Accuracy	Current Programming Accuracy	Voltage Measurement Accuracy	Current Measurement Accuracy
N6730 Series — 50 W DC Power Modules
N6731B	5 V / 10 A / 50 W	10 mV / 2 mV	0.1% + 19 mV	0.15% + 20 mA	0.1% + 20 mV	0.15% + 20 mA
N6732B	8 V / 6.25 A / 50 W	12 mV / 2 mV	0.1% + 19 mV	0.15% + 20 mA	0.1% + 20 mV	0.15% + 10 mA
N6733B	20 V / 2.5 A / 50 W	14 mV / 3 mV	0.1% + 20 mV	0.15% + 20 mA	0.1% + 20 mV	0.15% + 5 mA
N6734B	35 V / 1.5 A / 52.5 W	15 mV / 5 mV	0.1% + 35 mV	0.15% + 20 mA	0.1% + 35 mV	0.15% + 4 mA
N6735B	60 V / 0.8 A / 50 W	25 mV / 9 mV	0.1% + 60 mV	0.15% + 20 mA	0.1% + 60 mV	0.15% + 4 mA
N6736B	100 V / 0.5 A / 50 W	30 mV / 18 mV	0.1% + 100 mV	0.15% + 10 mA	0.1% + 100 mV	0.15% + 2 mA
N6740 Series — 100 W DC Power Modules
N6741B	5 V / 20 A / 100 W	20 mV / 2 mV	0.1% + 19 mV	0.15% + 20 mA	0.1% + 20 mV	0.15% + 20 mA
N6742B	8 V / 12.5 A / 100 W	12 mV / 2 mV	0.1% + 19 mV	0.15% + 20 mA	0.1% + 20 mV	0.15% + 10 mA
N6743B	20 V / 5 A / 100 W	14 mV / 3 mV	0.1% + 20 mV	0.15% + 20 mA	0.1% + 20 mV	0.15% + 5 mA
N6744B	35 V / 3 A / 105 W	15 mV / 5 mV	0.1% + 35 mV	0.15% + 20 mA	0.1% + 35 mV	0.15% + 4 mA
N6745B	60 V / 1.6 A / 100 W	25 mV / 9 mV	0.1% + 60 mV	0.15% + 20 mA	0.1% + 60 mV	0.15% + 4 mA
N6746B	100 V / 1 A / 100 W	30 mV / 18 mV	0.1% + 100 mV	0.15% + 10 mA	0.1% + 100 mV	0.15% + 2 mA
N6750 Series — High-Performance Autoranging DC Power Modules
N6751A	50 V / 5 A / 50 W	4.5 mV / 0.35 mV	0.06% + 19 mV	0.1% + 20 mA	0.05% + 20 mV	0.1% + 4 mA
N6752A	50 V / 10 A / 100 W	4.5 mV / 0.35 mV	0.06% + 19 mV	0.1% + 20 mA	0.05% + 20 mV	0.1% + 4 mA
N6753A	20 V / 50 A / 300 W	5 mV / 1 mV	0.06% + 10 mV	0.1% + 30 mA	0.05% + 10 mV	0.1% + 30 mA
N6754A	60 V / 20 A / 300 W	6 mV / 1 mV	0.06% + 25 mV	0.1% + 12 mA	0.05% + 25 mV	0.1% + 8 mA
N6755A	20 V / 50 A / 500 W	5 mV / 1 mV	0.06% + 10 mV	0.1% + 30 mA	0.05% + 10 mV	0.1% + 30 mA
N6756A	60 V / 17 A / 500 W	6 mV / 1 mV	0.06% + 25 mV	0.1% + 12 mA	0.05% + 25 mV	0.1% + 8 mA
N6760 Series — Precision DC Power Modules (values for highest range)
N6761A	50 V / 1.5 A / 50 W	4.5 mV / 0.35 mV	0.016% + 6 mV	0.04% + 0.2 mA	0.016% + 6 mV	0.04% + 0.16 mA
N6762A	50 V / 3 A / 100 W	4.5 mV / 0.35 mV	0.016% + 6 mV	0.04% + 0.2 mA	0.016% + 6 mV	0.04% + 0.16 mA
N6763A	20 V / 50 A / 300 W	5 mV / 1 mV	0.03% + 5 mV	0.1% + 15 mA	0.03% + 10 mV	0.1% + 10 mA

Important: The N6781A is a plug-in module, not a standalone instrument. It requires an N6700 Series mainframe (N6700C, N6701C, N6702C, or the N6705C DC Power Analyzer) to operate; the mainframe is sold separately and is not included with the module.

Important: For the N6781A and the other SMU and precision modules (N6761A–N6766A, N6781A / N6782A / N6784A / N6785A / N6786A) and the N6783A application-specific modules, the performance specification values shown are for the highest output / measurement range; these modules have multiple ranges.

Important: Specifications are warranted over the ambient temperature range of 0 to 55 °C after a 30-minute warm-up period, and apply at the mainframe output terminals with local sensing unless otherwise noted.

Important: Output terminal isolation: no output terminal may be more than ±240 VDC from any other terminal or chassis ground.

Important: N6784A note: when sinking power, the unit can operate at its maximum rated output power for only a limited amount of time. If the output power exceeds its safe limits (internal temperature above its safe limit), the output latches off (annunciated by the OT status bit) and a protect clear is required to resume normal operation.

Important: Option 760 (Output Disconnect/Polarity Reversal Relays) is not available on Models N6741B, N6751A, N6752A, N6761A, N6762A, and N6781A–N6786A; where installed, Option 760 limits the output current to 10 A maximum on Models N6742B and N6773A.

Important: The N6753A–N6756A, N6763A–N6766A, and N6792A modules each occupy two of the four mainframe module slots; all other modules occupy one module slot. When configuring a mainframe with fewer than four filled module slots, you must order a filler panel kit (N6708A) — each kit contains three filler panels — and every empty slot must be filled for proper operation.

Important: If you will be rack mounting the N6700, you must order the rack mount kit (N6709A / N6709C). Standard rack rails or slides are not compatible with the N6700 because of its 1U size and airflow requirements.

Important: Series and parallel operation: the maximum series operation is 240 V, and the maximum rated parallel operation is 100 A per N6705 mainframe. Each N6705C / N6715C mainframe has 4 module slots and provides 600 W total available output power; if the sum of the installed modules' power exceeds the mainframe's available output power, use Keysight's power management capability to allocate mainframe power to the outputs where it is needed.

Important: Arbitrary waveform generation, scope view, and the related oscilloscope measurement capabilities apply only when the power modules are installed in a Keysight N6705 DC Power Analyzer.

Recommended pairing: the N6780 Series SMUs install in the N6705 mainframe, and the BV9200B / BV9201B PathWave BenchVue software adds advanced battery drain analysis when used with the N6781A or N6785A. The 14585A Control and Analysis Software controls the family's DC power and electronic load modules installed in up to four N6705 mainframes — up to 16 modules — from a single PC.

Important: This data sheet lists an abbreviated set of specifications and characteristics. For the full list, complete performance specifications and supplemental characteristics for all power modules are in the Keysight N6700 Modular Power System Family Specifications Guide, part number N6700-90001 (see Chapter 5).

About this Pre-Owned unit

This is a Pre-Owned (used) Keysight N6781A module. Every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. For the exact configuration, available options, included accessories, calibration status, or current lead time for your application, our Test Architects can confirm the details before you order.

ValueTronics supplies both new and used test and measurement equipment, holding our own inventory under our own roof so we can confirm configuration and condition directly. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.