National Instruments SCB-68 User Manual download pdf (Page 30)

Chapter 3 Connecting Signals

SCB-68 Shielded Connector Block User Manual 3-2 ni.com

Figure 3-1. Summary of AI Connections

–

ACH

AISENSE

AIGND

–

ACH

AIGND

–

ACH(+)

ACH(–)

AIGND

–

ACH(+)

ACH(–)

AIGND

Refer to the

Using Bias Resistors

section for information on bias resistors.

Signal Source Type

Floating Signal Source

(Not Connected to Building Ground)

Grounded Signal Source

Examples:

• Ungrounded thermocouples

• Signal conditioning with

Isolated outputs

• Battery devices

Examples:

• Plug-in instruments with

nonisolated outputs

Input

Differential

(DIFF)

Single-Ended —

Ground

Referenced

(RSE)

Single-Ended —

Nonreferenced

(NRSE)

–

Common-

Mode

Voltage

Common-

Mode

Voltage

Common-

Mode

Voltage

–

Common-

Mode

Voltage

–

Common-

Mode

Voltage

Common-

Mode

Voltage

Refer to the

Using Bias Resistors

section for information on bias resistors.

–

ACH

+ V

–

AIGND

Ground-loop losses, V

, are added to

measured signal.

NOT RECOMMENDED

–

ACH

AISENSE

AIGND

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National Instruments SCB-68 User Manual Page 30

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