Measurement-computing CIO-EXP-RTD16 Manuel d'utilisateur télécharger pdf (Page 15)

4.7.3 Fully Differential

A differential signal has three wires from

the signal source. The signals are Signal

High, Signal Low and Signal Ground

(-IEXC) (which is LLGND).

A differential connection allows you to

connect the CIO-EXP-RTD16 to a signal

source with a ground that is different from

the PC ground, but less than 10V

difference, and still make a true

measurement of the signal.

EXAMPLE: A laboratory instrument with

its own wall plug.

NOTE: There are sometimes voltage

differences in wall GND between outlets.

Measure it to verify that it doesn’t exceed

10V.

Figure 4-7. Differential Voltage Input

11

+IEXC

+SENSE

−

IEXC

−

SENSE

Voltage

Source

Differential Voltage Input

Signal-High

Signal-Low

Ground cable shield at –IE

X

terminal only.

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