Measurement-computing DataShuttle Manual do Utilizador descarregar pdf (Página 59)

DataShuttle and DynaRes

11-12-01

Introduction to Terminal Panels 6-3

T71 Terminal Panel

Designed for use with the DynaRes data acquisition boards, the T71 terminal panel comes with a 3-ft.,

detachable M-M Centronics cable. The panel features terminals for eight analog inputs and eight digital I/O

lines, with room for up to eight digital opto-isolation modules.

There are three different models of the T71 terminal panel. The T71-TC is optimized for thermocouple

measurements, featuring a large aluminum isothermal plate with screw terminals for eight analog inputs.

The T71-RTD, specifically designed for high accuracy RTD measurements, has signal conditioning set

resistors pre-installed at the factory for use with two- or three-wire RTDs. The T71-GP model, pictured

below, is available for general-purpose measurements.

Illustration of the T71-GP Terminal Panel

Using the Digital I/O Lines – On-unit LEDs show the state of the digital I/O lines. “On” indicates that the

digital input or output is “low,” or that, if a digital output opto-isolator is installed on that channel, it is

energized.

Note that the state of the digital inputs will be “high”, if there is nothing connected. To change a line’s

default to low, a resistor (R1 for Channe1, R2 for Channel 2, etc.) must be moved to an alternate area (R1G

for Channel 1, R2G for Channel 2, and so on).

To Measure Current – There are eight dip switches, marked “Current/Volt,” located under the analog input

daughterboard. To measure current (4-20mA) on a channel, move the corresponding switch to the “Current”

position. This will connect a 24.9

Ω

, 0.1% resistor across the + and – inputs for that channel.

:$51,1*

Setting the switch to current may damage the resistors if a voltage in excess of 2.5V is

applied.

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Measurement-computing DataShuttle Manual do Utilizador Página 59