National Instruments NI 7831R User Manual Page 29
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Chapter 2 Hardware Overview of the NI 7831R
NI 7831R User Manual 2-10 ni.com
Figure 2-6. Differential Input Connections for Ground-Referenced Signals
With this connection type, the instrumentation amplifier rejects both the
common-mode noise in the signal and the ground potential difference
between the signal source and the NI 7831R ground, shown as V
cm
in Figure 2-6. In addition, the instrumentation amplifier can reject
common-mode noise pickup in the leads connecting the signal sources to
the device. The instrumentation amplifier can reject common-mode signals
when V+
in
and V–
in
(input signals) are both within their specified input
ranges. Refer to Appendix A, Specifications, for more information about
input ranges.
Differential Connections for Nonreferenced or
Floating Signal Sources
Figure 2-7 shows how to connect a floating signal source to a channel on
the NI 7831R configured in DIFF input mode.
DIFF Input Mode Selected
–
+
–
+
–
+
–
+
V
cm
V
s
Ground-
Referenced
Signal
Source
Common-
Mode
Noise and
Ground
Potential
I/O Connector
AISENSE
AIGND
V
m
Measured
Voltage
Instrumentation
Amplifier
x8 Channels
AI+
AI–
- Reconfigurable I/O 1
- Important Information 3
- Compliance 4
- Contents 5
- About This Manual 7
- Related Documentation 9
- Introduction 10
- Using PXI with CompactPCI 11
- Reconfigurable I/O Concept 12
- Flexible Functionality 12
- User-Defined I/O Resources 13
- Software Development 14
- LabVIEW Real-Time Module 15
- Cables and Optional Equipment 16
- Custom Cabling 17
- Safety Information 18
- Hardware Overview 20
- Analog Input 22
- Input Modes 23
- Input Range 23
- Types of Signal Sources 26
- Signal Sources 28
- Floating Signal Sources 29
- Resistors 30
- (see text) 30
- Sources (RSE Input Mode) 32
- Sources (NRSE Input Mode) 32
- Analog Output 34
- Digital I/O 35
- RTSI Trigger Bus 38
- Switch Settings 40
- Power Connections 41
- Field Wiring Considerations 42
- Calibration 43
- External Calibration 44
- Specifications 45
- Accuracy Information 46
- DC Transfer Characteristics 46
- Dynamic Characteristics 46
- Settling Time 47
- Output Characteristics 47
- Voltage Output 48
- Reconfigurable FPGA 49
- Bus Interface 50
- Power Requirement 50
- Physical 51
- Maximum Working Voltage 51
- Environmental 51
- Operating Environment 51
- Storage Environment 52
- Electromagnetic Compatibility 53
- CE Compliance 53
- Connecting I/O Signals 54
- DIO 0–23 Connector 60
- Pin Assignment 60
- DIO 24–39 Connector 60
- Using the SCB-68 61
- Shielded Connector Block 61
- Technical Support and 62
- Professional Services 62
- Glossary 64
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