Fluke 2640A NetDAQ Networked Data Acquisition Unit (100 rps) (Pre-Owned)

Key Features At A Glance

• Universal Input Module accepts thermocouples, RTDs, thermistors, DC/AC volts, ohms, frequency, and current on any channel without external signal conditioning
• Scalable from 20 to 120 universal analog input channels per chassis, expandable to 2,000+ channels across networked systems
• Ethernet 10/100BaseT TCP/IP networking for distributed data acquisition across existing LANs
• Six-slot modular chassis accepts any combination of Fast Analog Input (FAI), Precision Analog Input (PAI), and Digital I/O modules
• Isolated analog measurement circuitry channel-to-channel, input-to-output, and input-to-ground for direct measurement of voltages up to 300 V AC rms (PAI module, channels 1 and 11)
• 60 computed channels per system for real-time math functions including addition, subtraction, multiplication, division, log, exponent, square root, and integer functions
• Dual power input accepts 100–240 V AC or 9–45 V DC simultaneously for fail-safe operation
• Closed-case calibration with NMRR of 50 dB at 50/60 Hz and CMRR ≥120 dB DC on the PAI module

The Fluke 2680A is a modular, networked data acquisition system designed to combine laboratory-grade measurement precision with the flexibility required for industrial monitoring applications. Each 2680A chassis provides six slots that accept user-selectable combinations of Fast Analog Input modules, Precision Analog Input modules, and Digital I/O modules, allowing the system to scale from 20 to 120 universal analog channels in a single chassis. Multiple chassis can be linked through Ethernet TCP/IP to serve more than 2,000 channels across a single network.

According to the datasheet, the 2680A is widely used for R&D applications, environmental testing, product testing and process validation, troubleshooting, and manufacturing test systems. The datasheet specifically identifies deployment environments including high-voltage substations, nuclear power plants, clean rooms, production lines, and automotive test tracks. The system's combination of standalone and distributed networked operation makes it suitable for both stationary laboratory installations and applications where data must be distributed to multiple users in real time.

Compare Other Models in This Series

The Fluke 2680 Series consists of two chassis variants, the 2680A Data Acquisition System and the 2686A Data Logging System, sharing the same six-slot modular architecture, the same module compatibility, and the same Fluke DAQ software. Both chassis accept up to five 20-channel analog input modules plus a digital I/O module in the sixth slot, or six analog input modules for a maximum of 120 universal analog channels per chassis.

The two chassis differ in how acquired data is stored and routed. The 2680A is the network front-end variant, distributing data over Ethernet 10/100BaseT to one or more host PCs. The 2686A adds a PCATA flash memory drive that writes scans directly to a removable memory card, supporting standalone data logging in locations without continuous PC connectivity. Both chassis can also be combined in the same installation, with the 2686A providing local card-based data security alongside the 2680A's networked operation.

Each pre-owned 2680 Series chassis below is its own product page with condition-matched pricing. Module selection is independent of chassis selection: a 2680A or 2686A chassis can be configured with any combination of 2680A-FAI, 2680A-PAI, and 2680A-DIO modules to match the application's mix of throughput, isolation, and digital I/O requirements.

The 2680A is the chassis variant for installations where measured data is consumed by a networked host PC or distributed across multiple PCs over a LAN. It does not include onboard removable storage; the 2680A relies on its 10/100BaseT Ethernet interface and TCP/IP protocol to deliver data to Fluke DAQ software or OPC-compliant client applications running on the network.

Choose the 2680A when the data acquisition system will operate with a continuously available host PC and the priority is networked distribution of measurements to one or more clients. Choose the 2686A when the installation is remote, mobile, or otherwise operates without persistent PC connectivity, since the 2686A's onboard PCATA flash drive captures scans locally to memory cards ranging from 16 MB up to 1 GB. Storage capacity scales with channel count: at 120 active channels, a 16 MB card holds 28,613 scans, a 256 MB card holds 448,000 scans, and a 1 GB card holds 1.792 million scans according to the datasheet's capacity table.

Both chassis use the same modules, the same Fluke DAQ software, the same Ethernet interface, and the same digital I/O and relay capability. Refer to the comparison table that follows for the chassis-level distinction between networked operation and removable memory card logging.

Model	Channels per System	Max Throughput	Basic DC Accuracy
2640A	20 to 400	100 Rdgs/s (1000 across system)	0.01 %
2680A	20 to 2000+	3000 Rdgs/s	0.01 %
2686A	20 to 120 per chassis	3000 Rdgs/s	0.01 %
2620A	21	17 Rdgs/s	0.018 %

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

Accessories Supplied

• Instrument
• NetDAQ Logger Software
• Universal Input Module
• power cable

Product Core & Specifications

Specification	2680 Series	Hydra Series	NetDAQ Series
Channels per System	20 to 2000+	21 to 42	20 to 400
Max Throughput (Rdgs/s)	3000	17	1000
Basic DC Accuracy	0.01 %	0.018 %	0.01 %
Universal Signal Conditioning	Yes	Yes	Yes
PC Interface	Ethernet 10/100 BaseT	RS-232, PCMCIA, IEEE-488	Ethernet 10BaseT
Operating Temperature	-20 °C to 60 °C	0 °C to 60 °C	-20 °C to 60 °C
Storage Temperature	-40 °C to 70 °C	-40 °C to 75 °C	-40 °C to 70 °C
Power (AC)	100 to 240 V AC, 50/60 Hz, 100 VA max	90 to 264 V AC, 50/60 Hz, <10 W	107 to 264 V AC, 50/60 Hz, <15 W
Power (DC)	9 to 45 V DC (50 W max)	9 to 16 V DC (<4 W)	9 to 16 V DC (<6 W)
Altitude (Operating)	2000 m	Not specified	2000 m (6,500 ft)
Altitude (Storage)	12,200 m	Not specified	12,200 m (40,000 ft)
Clock Accuracy	1 minute/month (0 °C to 50 °C)	1 minute/month (0 °C to 50 °C)	1 minute/month (0 °C to 50 °C)
Normal Mode Rejection	50 dB @ 50/60 Hz, ±0.1 %	53 dB (60 Hz), 47 dB (50 Hz)	50 dB @ 50/60 Hz, ±0.1 %
Trigger Input Min Pulse	5 µs	5 µs	5 µs
Ethernet Standard	IEEE 802.3, 10/100BaseT, TCP/IP	N/A	IEEE 802.3, 10Base-2 and 10Base-T, TCP/IP

Important: Maximum common-mode voltage on the 2680A-PAI module is 300 V DC or AC rms on channels 1 and 11 only; all other PAI channels and all FAI channels carry lower limits (150 V on PAI channels 2–10 and 12–20, 50 V DC or 30 V AC rms on FAI channels). Confirm input wiring against the module specifications before connecting any source above 50 V.Important: Closed-case calibration is supported. The RS-232C interface on 2680 Series and NetDAQ Series units is for calibration only.Important: The 2620A-101 10 Ω Current Shunt Strip is required to perform AC or DC current measurements up to 100 mA on Hydra Series and NetDAQ Series units; it is sold separately.Important: On the 2620A Hydra unit, the optional IEEE-488 interface (model 2620A/05) disables the RS-232 interface while in use. Trend Link, NetDAQ Logger, and other application software do not support IEEE-488.Important: Specifications reflect 3-Sigma calculation (more than 99.7% of instruments perform within stated error limits). Total instrument accuracy is for 90 days following calibration and ambient temperature range of 18 to 28 °C.Important: AC voltage accuracies are specified for crest factor to 2.0.Recommended pairing: Fluke DAQ software ships with the 2680A and also controls Fluke 2640A and 2645A NetDAQ units, allowing a single host PC to manage a mixed 2680 Series and NetDAQ installation as one data acquisition system.

About this used unit

• Warranty included
• Functional verification included
• Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

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.