National Instruments TB-2605 Isothermal multiplexer terminal block

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National Instruments · PXI

TB-2605

Name: TB-2605
Brand: National Instruments

The NI TB-2605 is an isothermal screw-terminal accessory for PXI-2501 and PXI-2503 multiplexer switch modules. It provides cold-junction temperature sensing and front-panel analog bus connections.

ManufacturerNational Instruments

ModelTB-2605

Part Number777878-01

Product TypeIsothermal multiplexer terminal block

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Manufacturer part number777878-01

Compatible switchesPXI-2501 and PXI-2503

Field wiringPCB-mounted screw terminals

Cold-junction sensorOnboard thermistor

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Overview

Product overview

Key product information and technical features.

The TB-2605 mounts directly to the switch module's front I/O connector. Its isothermal construction reduces temperature differences across the terminals for thermocouple measurements.

NI lists this terminal block for the 2501/2503 multiplexer configurations with 6×1, 12×1, 24×1, and 48×1 topologies. Select wiring according to the configured switch topology.

Isothermal terminal construction for thermocouple connections.
Integrated thermistor for cold-junction temperature measurement.
Two front analog bus connectors support bus interconnection.
Cover and strain-relief bar secure the field wiring.

Verified specifications

Technical data

Verified product specifications.

Termination	Screw terminals on PCB
Switch-card I/O connection	68-position
Analog bus connectors	2 connectors
Cold-junction compensation accuracy, 15–35 °C	±0.5; includes sensor accuracy and sensor-to-terminal temperature difference °C
Cold-junction compensation accuracy, 0–15 °C and 35–55 °C	±0.9; includes sensor accuracy and sensor-to-terminal temperature difference °C

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Compatibility

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National Instruments

Manufacturer

PXI-2501 / PXI-2503

Supported multiplexer switch modules

TB-2605

Front-mounted signal termination

Multiplexer topology options

6×1, 12×1, 24×1, and 48×1 for NI 2501/2503

Install the switch card in the chassis before attaching the TB-2605; avoid extreme temperature differentials around the terminal block.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI TB-2605 Product PageProduct Page · ni.com

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TB-2605 Isothermal Terminal Block Installation GuideInstallation Guide · download.ni.com

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NI Multiplexer Switch Cable and Accessory CompatibilityTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Which switch modules support the TB-2605?

NI lists the TB-2605 as a front-mounted terminal block for NI 2501 and 2503 multiplexer configurations.

Can the analog buses of adjacent switch cards be connected?

Yes. The installation guide describes linking adjacent cards through their terminal blocks with a low-voltage analog bus plug.