National Instruments TB-2605 Multiplexer Terminal Block

Description

National Instruments TB-2605 Multiplexer Terminal Block
This is a New National Instruments TB-2605 Multiplexer Terminal Block
The TB-2605 is an isothermal terminal block that consists of a printed
circuit board with screw terminals. The terminal block connects directly
to the front panel I/O connector of the NI 2501 or NI 2503.
The terminal block can easily accommodate thermocouples, resistance
temperature detectors (RTDs), thermistors, and voltage signals.
The TB-2605 features an isothermal construction to minimize the
temperature gradients across the screw terminals and a high-accuracy
thermistor cold-junction temperature sensor for measuring with
thermocouples. Enclosures keep out air currents to maintain an isothermal
environment for the screw terminals and the cold-junction sensor
Specifications
Manufacturer: National Instruments
Part Number: 777878-01
Type: Terminal Block
Connectors: Screw Terminals
Compatible Switch Cards: NI 2501 and NI 2503
Cold-junction Sensor Accuracy: 0.5° from 15 to 35 °C, 0.9° from 0° to 15° C, and 35 to 55 °C
Dimensions: 3.3 by 4.2 by 0.80 in.
Input Characteristics
All input characteristics are DC, ACrms, or a combination, unless otherwise specified.
Maximum switching voltage (channel-to-ground): ±10 VDC, 7 VAC
Overvoltage protection
Signals CH<0..23>, COM<0..3>
Powered on or off: ±25 VDC
Signals AB<0..1>
Powered on: ±25 VDC
Powered off: ±15 VDC
FET switch on resistance
Typica:  50 O
Maximum at: 25 °C 85 O
Maximum at: 85 °C 100 O
Total path resistance
Channel-to-analog bus
Typical: 1,650 O
Maximum: 1,900 O
Channel-to-COM
Typical: 1,900 O
Maximum: 2,150 O
Amplified multiplexer topologies
Offset voltage: 1.5 mV
Cold-junction sensor: 60 µV
Multiplexer topologies (nonamplified)
Offset voltage: 5 µV
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