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Using Accelerometers
Cable Driving
Operation over long cables is a concern with all types of sensors. Concerns involve cost, frequency
response, noise, ground loops, and distortion caused by insufficient current available to drive the cable
capacitance.
The cost of long cables can be reduced by coupling a short (1 m) adapter cable from the accelerometer to a
long low-cost cable like RG-58U or RG-62U with BNC connectors. Since cable failure tends to occur at
the accelerometer connection where the vibration is the greatest, only the short adapter cable would need
replacement.
Capacitive loading in long cables acts like a low-pass, second-order filter and can attenuate or amplify high-
frequency signals depending on the output impedance of the accelerometer electronics. Generally this is not
a problem with low-frequency vibration (10 Hz to 2000 Hz). For measurements above 2000 Hz and cables
longer than 100 ft, the possibility of high-frequency amplification or attenuation should be considered.
The WBK14 constant-current source provides 2 or 4 mA to integral electronics. Use the higher current
setting for long cables, high peak voltages, and high signal frequencies.
The maximum frequency that can be transmitted over a given length of cable is a function of both the cable
capacitance and the ratio of the maximum peak signal voltage to the current available from the constant
current source:
Frequency Response to 5% of
Maximum Output Signal Amplitude
Drive Current
(mA)
Cable Length
@30 pF/ft (Ft)
± 1 V ± 5 V
2 10 185 kHz 37 kHz
2 100 18.5 kHz 3.7 kHz
2 1000 1.85 kHz 370 Hz
4 10 550 kHz 110 kHz
4 100 55 kHz 11 kHz
4 1000 5.5 kHz 1.1 kHz
f
K
C
V
Icc Ib
=
−
2
π
Where:
f = Maximum frequency in Hz
K = 3.45 ×10
9
. K is the scale factor to convert Farads to picoFarads and Amperes to milliAmperes
and a factor to allow cable capacitance to charge to 95% of the final charge.
C = Cable capacitance in picoFarads
V = Maximum peak measured voltage from sensor in volts
Icc = Constant current from current source in mA
Ib = Current required to bias the internal electronics, typically 1 mA
WBK14 - Specifications
Specifications are provided in Chapter 11.
- WavePort 1
- 03-10-00 3
- Manual Layout 5
- Table of Contents 6
- WavePort/PE, Standard Package 9
- 1-2 Unpacking 10
- WavePort User’s Manual 10
- What are WavePorts ? 11
- Power-Related Items 12
- Fully Differential 13
- BNC shells are analog common 13
- WavePort/V8 15
- WaveBook 15
- Analog Inputs 15
- DC-Coupled Only 15
- System Setup 19
- 3-2 System Setup 20
- CAUTIONCAUTION 21
- 5. Installing Software 23
- Master Setup Screen 24
- System Setup 3-7 25
- 3-8 System Setup 26
- System Setup 3-9 27
- 3-10 System Setup 28
- WavePort/PE Devices 30
- Basic Operation 31
- WavePort/V Devices 35
- Hardware Setup Configuration 36
- Ground Connections 38
- 09-29-00 39
- Programmable Features 40
- Triggers 41
- Digital-Pattern Trigger 42
- Multi-channel Triggering 42
- Power Aspects 44
- DC Power Input 45
- CA-198 Power-Adapter Cable 45
- Power Module Operation 46
- Charging 47
- Fuse Replacement 47
- WavePort’s Fan 50
- Software, An Introduction 5 51
- WaveView 6 53
- Introduction 54
- WaveView StartUp Box 55
- Reference Note: 55
- Select Device Box 55
- Configure Channels 56
- Configure Acquisition 57
- Collect Data 58
- Store Data 59
- Menu Items & Buttons 59
- Performance 61
- Memory Module 61
- Input Channel Configuration 62
- WaveView 6-11 63
- Data Conversion 64
- Acquisition Configuration 65
- Trigger Source Pull-Down List 66
- Digital Trigger 66
- Channel 1 Analog Trigger 66
- Multiple Ch Analog 66
- WaveView 6-15 67
- Pulse Trigger 69
- WaveView Scope Window 70
- Scope Display 72
- Preface …… 7-2 75
- DIAdem Quick Start …… 7-3 75
- DIAdem Quick Start 77
- 3. View Data 79
- Using DIAdem with ChartView 80
- Where to go from here … 84
- DIAdem-VIEW Help Files 84
- “Examples” Help Files 85
- DIAdem - the PC Workshop 87
- DIAdem® screen layout 88
- 04-22-00 89
- Note: 91
- DIAdem Help 92
- Sample demos in Help 93
- Start Example 93
- Desktop Settings 93
- General Settings 93
- Device-specific 93
- Memory organization 94
- Define Report 94
- Standard directory structure 94
- Save Desktop under 95
- New Name 95
- Load Desktop file 95
- The Data Area 97
- Saving and Opening Data Sets 100
- 04-19-00 101
- Viewing Data as Graphs 102
- DIAdem® 104
- How to Copy or Delete a Graph 106
- Scrolling through a segment 108
- Scrolling off 108
- Turning on scrolling 108
- Two systems of the 109
- Delete all graphs 109
- Autosequences for graph 109
- Troubleshooting 8 111
- Driver Support 112
- Connection Problems 112
- Windows NT V3.51 113
- Windows 95/98/2000 Problems 113
- 8-4 Troubleshooting 114
- Customer Assistance 115
- 8-6 Troubleshooting 116
- General Maintenance 117
- To Clean the Filter Media: 118
- To Replace the Filter Media: 118
- Accessories 120
- WARNINGWARNING 121
- WavePort/PE 123
- Accelerometer Inputs: 124
- Triggering 124
- External Clock 124
- 09-29-00 125
- WavePort/V Specifications 126
- System Performance: 127
- Optional Accessories 129
- 10-8 Specifications 130
- Overview 131
- Frequency Response 132
- Dynamic Range 132
- Bias Level 132
- Overload Recovery 132
- Electrical Grounding 133
- Cable Driving 134
- 04-13-00 135
- 04-13-00 136
- Glossary 137
- Glossary xiii 139
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