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National Instruments · NI 435x

TBX-68T

The NI TBX-68T is a DIN-rail isothermal screw-terminal block for NI 435x systems, with a thermistor cold-junction sensor.

ManufacturerNational Instruments

ModelTBX-68T

Product TypeIsothermal terminal block

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Technical Supportmodel & compatibility help

MountingDIN rail

Connection68-pin

Auto ZeroDedicated CH1

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Overview

Product overview

Key product information and technical features.

The TBX-68T provides field-wiring connections for NI 435x measurements. Supported signals include thermocouples, RTDs, thermistors and DC voltage.

Isothermal construction minimizes terminal temperature gradients.
Screw terminals provide signal-wiring access.
Dedicated Auto Zero channel supports offset correction.

Verified specifications

Technical data

Verified product specifications.

I/O connector	68-pin
Compatible DIN rails	DIN EN 50 022; DIN EN 50 035
Cold-junction sensor channel	CH0
Auto Zero channel	CH1; CH1+ connected to CH1−

Condition & included items

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Condition

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Included

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Revision

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Compatibility

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National Instruments

Manufacturer

NI 435x

Measurement system

TBX-68T

Isothermal wiring accessory

Compatibility

NI USB-4350, PXI-4351 and PCI-4351.

Keep the terminal block away from extreme temperature differentials.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks Installation GuideInstallation Guide · download.ni.com

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NI 435x User ManualUser Manual · docs-be.ni.com

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NI 435x signal connections and measurement configurationTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Which measurement devices support the TBX-68T?

NI lists the NI USB-4350, PXI-4351 and PCI-4351.

Which cable connects the TBX-68T?

NI recommends SH6868 shielded cabling; R6868 ribbon cabling is also listed.

Is the TBX-68T identical to the TBX-68?

No. The TBX-68 extends the device connector pinout; the TBX-68T includes a dedicated Auto Zero channel.