Fluke 2645A NetDAQ Networked Data Acquisition Unit (1000 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 SeriesThe 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 2645A 20 to 400 1000 Rdgs/s 0.02 % 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,
