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SCB-68A
National Instruments SCB-68A User Manual
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NI SCB-68A User Manual
68-Pin Shielded Connector Block
NI SCB-68A User Manual
ni.com/manuals
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August 2012
375865A-01
2
Table of Contents
Default Chapter
6
Table of Contents
6
Chapter 1
9
Getting Started with the SCB-68A
9
What You Need to Get Started
10
Setting up the SCB-68A
11
Using the SCB-68A in Direct Feedthrough Mode
14
Using the SCB-68A with MIO DAQ Devices
15
Mounting the SCB-68A
17
Panel Mounting
17
DIN Rail Mounting
18
Securing the Cover on the SCB-68A
19
Soldering and Desoldering Components on the SCB-68A
19
Soldering Equipment
19
Removing the SCB-68A Board from the Base
19
Soldering and Desoldering Guidelines
20
Related Documentation
21
Chapter 2
22
Analog Input and Temperature Sensor Measurements
22
Analog Input Circuitry and Channel Pad Configuration
23
Connecting Analog Input Signals
26
Floating Signal Sources
28
When to Use Differential Connections with Floating Signal Sources
28
When to Use Non-Referenced Single-Ended (NRSE) Connections with Floating Signal Sources
28
When to Use Referenced Single-Ended (RSE) Connections with Floating Signal Sources
29
Using Differential Connections for Floating Signal Sources
29
Using Non-Referenced Single-Ended (NRSE) Connections for Floating Signal Sources
32
Using Referenced Single-Ended (RSE) Connections for Floating Signal Sources
33
Ground-Referenced Signal Sources
33
When to Use Differential Connections with Ground-Referenced Signal Sources
33
When to Use Non-Referenced Single-Ended (NRSE) Connections with Ground-Referenced Signal Sources
34
When to Use Referenced Single-Ended (RSE) Connections with Ground-Referenced Signal Sources
34
Using Differential Connections for Ground-Referenced Signal Sources
35
Using Non-Referenced Single-Ended (NRSE) Connections for Ground-Referenced Signal Sources
36
Using the Temperature Sensor
37
Taking Thermocouple Measurements
37
Temperature Sensor Output and Accuracy
38
Thermocouple Sources of Error
38
Open Thermocouple Detection
39
Thermocouple Input Filtering
40
Installing Bias Resistors
41
Lowpass Filtering
42
One-Pole Lowpass RC Filter
45
Selecting Components for Lowpass Filtering
45
Adding Components for Lowpass Filters on Analog Input Signals
46
Analog Input Lowpass Filtering Applications
47
Highpass Filtering
48
One-Pole Highpass RC Filter
50
Selecting Components for Highpass Filtering
50
Adding Components for Highpass Filtering on Analog Input Signals
51
Analog Input Highpass Filtering Applications
52
Current Input Measurement
53
Selecting a Resistor for Current Input Measurement
54
Adding Components for Current Input Measurement on Analog Input Signals
54
Attenuating Voltage
56
Selecting Components for Attenuating Voltage
57
Accuracy Considerations for Attenuating Voltage
57
Adding Components for Attenuating Voltage on Analog Input Signals
58
Analog Input Voltage Dividers
59
Chapter 3
61
Analog Output Waveforms
61
Analog Output Channel Pad Configuration
61
Lowpass Filtering
62
One-Pole Lowpass RC Filter
65
Selecting Components for Lowpass Filtering
66
Adding Components for Lowpass Smoothing Filters on Analog Output Signals
66
Analog Output Lowpass Filtering Applications
67
Attenuating Voltage
68
Selecting Components for Attenuating Voltage
69
Accuracy Considerations for Attenuating Voltage
69
Adding Components for Attenuating Voltage on Analog Output Signals
69
Analog Output Voltage Dividers
70
Chapter 4
71
PFI 0 and Digital Input Measurements
71
PFI 0 Channel Pad Configuration
71
Lowpass Filtering
72
One-Pole Lowpass RC Filter
75
Selecting Components for Lowpass Filtering
75
Adding Components for Lowpass Digital Filtering on Digital Trigger Input Signals
76
PFI 0 Lowpass Filtering Applications
77
Attenuating Voltage
78
Selecting Components for Attenuating Voltage
79
Adding Components for Attenuating Voltage on Digital Inputs
79
Digital Input Voltage Dividers
80
Chapter 5
81
Fuse and Power Information
81
Power Supply Circuitry
81
Fuse
81
Adding Power Filters
82
Appendix A Specifications
83
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National Instruments SCB-68A Specifications
General
Brand
National Instruments
Model
SCB-68A
Category
Cables and connectors
Language
English
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