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DataShuttle and DynaRes
11-12-01
Analog Input & Output 13-5
Figure 13-2. Strain Gage Connections
Piezoelectric Sensors
Our data acquisition boards can be used with piezoelectric sensors to monitor vibration, audio and other
mechanical and acoustic effects. Piezoelectric sensors rely on the piezoelectric effect, where a crystal
generates a voltage when it is subjected to stress or strain. Piezoelectric sensors are a good, inexpensive
sensor for the monitoring of acoustic, mechanical and audio disturbances provided an accurate quantitative
reading is not required.
Figure 13-3a shows a simple DC-coupled piezoelectric sensor configuration. In this configuration, the
piezoelectric sensor is connected to the terminal panel, either using a coaxial cable or twisted pair cable.
R3 is the termination resistor, which is used to terminate the piezoelectric sensor signal. In many cases, the
termination resistor is not needed. In some cases, the termination resistor is the characteristic impedance of
the cable, often 50, 75 or 150 ohms. Refer to the technical manual for your piezoelectric sensor for
selection of R3.
Figure 13-3b shows an AC-couple piezoelectric sensor example, which is the most common
implementation. An AC-couple piezoelectric sensor is easier to measure because any DC offset in the
piezoelectric sensor signal is automatically removed for you. The capacitor C and the resistor R3 form a
high-pass filter network, which specifies the lowest frequency signal, which will be transmitted, to your
analog input board. This lowest frequency point is given by:
F= 1
÷
(2
π
R3C)
Install capacitor C in location R1 or R2. You must select R3 to be large compared to the output impedance
of your piezoelectric sensor, then select C to set the lowest frequency which you wish to digitize via the
data acquisition board. Refer to your piezoelectric sensor manual for details.
- DataShuttle and DynaRes 1
- Table of Contents 5
- 4 - Installing the DynaRes 6
- 5 - DynaRes - Technical Notes 6
- 8 - Installing the ACAO 7
- Technical Notes 7
- 10 - QuickLog Introduction 7
- Introduction 9
- Data Presentation 10
- Dynamic Resolution 10
- Features and Configurations 11
- DataShuttle Model Variations 12
- DataShuttle-RTD 13
- DataShuttle-TC 14
- DataShuttle-5B 14
- Installing Your DataShuttle 15
- Physical Installation 16
- Printer Installation 17
- Keyboard Adapter Installation 17
- Next Steps 17
- Block Diagram 19
- Auxiliary Components 21
- Power Supplies 22
- Examples 23
- Example 3: Ground loops 24
- &$87,21 25
- Digital Components 26
- Installing Pull-up Resistors 26
- Counter/Timer 27
- If You Need Customer Support 28
- Troubleshooting: Operation 29
- Product Specifications 31
- DataShuttle-16 RTD Accuracy 32
- Analog Input 34
- Digital Input/Output 34
- Analog Output 34
- General Information 35
- Introduction to the DynaRes 3 37
- DynaRes System Requirements 40
- Installing the DynaRes 4 41
- Physical Board Installation 42
- Measuring Current 44
- Setting the Base Address 45
- Changing Hardware Interrupts 46
- DynaRes - Technical Notes 5 47
- Recalibration 49
- EDITCAL Utility 49
- DynaRes 8/16 RTD Accuracy 53
- Stability 54
- Input Impedance 54
- Noise Rejection 54
- Common Mode Range 54
- Input Protection 54
- Resolution/Scan Rate 55
- Digital I/O Channels 55
- General Conditions 55
- Types of Terminal Panels 58
- T71 Terminal Panel 59
- Reference Tables 60
- Digital Auxiliary Components 64
- Troubleshooting Q & A 65
- Installing the ACAO 8 71
- Setting the Switches 73
- Multiple Boards 74
- Single Board 75
- Disabling Board 75
- Setting the Switch 75
- Base Address Settings 77
- 8-8 Installing the ACAO 78
- Overview 79
- Editing Calibration Files 81
- Calibration File Format 82
- Using EDITCAL 83
- EDITCAL Selections 84
- 0 to 10V 0.02% 0.01% 86
- Auxiliary Power Output 87
- QuickLog Introduction 10 89
- Setting Up QuickLog 90
- Specifications 91
- I/O Configuration By Channel 92
- Chart Configuration 92
- File Menu 93
- Edit Menu 93
- Options Menu: General 94
- Options Menu: Inputs 95
- Options Menu: Output Meters 95
- Options Menu: Chart 95
- Chart Menu 96
- Run Menu 96
- Window Menu 96
- Calibration Menu 96
- Help Menu 96
- Applications Primer 12 97
- Sensor Connections 98
- Digital Connections 98
- Applications Primer 12-3 99
- 12-4 Applications Primer 100
- Analog Input & Output 13 101
- Thermocouple Types 103
- Strain Gages 104
- Piezoelectric Sensors 105
- RTD Ranges & Resolution 108
- RTD Accuracy 109
- High Voltage Divider 111
- Voltage Output 111
- Current Output 112
- Digital I/O 14 115
- 14-2 Digital I/O 116
- Digital I/O 14-3 117
- Pulse Counting 118
- Cascaded Counter/Timers 118
- Frequency/Rate Measurement 119
- 14-6 Digital I/O 120
- Appendix A 121
- Glossary 123
- Glossary - 2 124
- Glossary - 3 125
- Glossary - 4 126
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