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Page 62 MAKING YOUR OWN ADAPTER OR ACTIVE PROBE
C
YBER
A
MP
380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.
5.000 V
(
4
)
INPUT
(
1
)
INPUT ( 2 )
ANALOG GROUND ( 10 )
SPX
SENSOR
16.1
Ω
909
Ω
LM334
Figure 28. Temperature compensated pressure sensor. In this circuit, type SPX pressure sensors from
SenSym Corporation are temperature compensated using the type LM334 temperature-dependent current
source from National Semiconductor Corp. The LM334 output current rises linearly with temperature at
+0.336%/°C. The SPX bridge sensitivity decreases linearly with temperature at -0.235%/°C. Resistor R2
reduces the temperature coefficient of the LM334 circuit to provide span compensation of +0.235%/°C.
Resistor R1 sets the current. For details of how R1 and R2 values are calculated, see application note SSAN-16
from SenSym Corporation.
Linear Potentiometers
Rotary Potentiometers
5.000 V
(
4
)
15 V
(
15
)
INPUT
(
1
)
15V
(
8
)
ANALOG GROUND
(
10
)
5.000 V
(
4
)
INPUT
(
1
)
ANALOG GROUND
(
10
)
A
B
Figure 29. Potentiometer interface. This circuit can be used to interface any potentiometer to the CyberAmp.
These could be linear or rotary potentiometers used for displacement measurements, or a hand-turned
potentiometer for special input to a data acquisition program. The minimum value of R is 200 Ω, but typically
much higher values would be used.
A.
Unbuffered circuit. The input impedance of the CyberAmp is 1 MΩ.
For R = 1 kΩ, the non-linearity introduced by the 1 MΩ loading is < 0.1%. For R = 10 kΩ, the non-linearity
introduced by the 1 MΩ loading is < 1%.
B.
For larger R values, a buffer amplifier is recommended.
- CyberAmp 380 1
- Declaration of Conformity 3
- IMPORTANT INFORMATION 5
- RENSEIGNMENTS IMPORTANTS 6
- WICHTIGE INFORMATIONEN 7
- INFORMACION IMPORTANTE 8
- Explanation of symbols 9
- Explication des symboles 9
- Explicación de símbolos 9
- SÉCURITÉ 10
- SICHERHEITS 10
- HINWEISE 10
- SEGURIDAD 10
- COPYRIGHT 11
- VERIFICATION 11
- TABLE OF CONTENTS 13
- INTRODUCTION 19
- Page 2 INTRODUCTION 20
- INTRODUCTION Page 3 21
- FUNCTIONAL DESCRIPTION 23
- General Features 26
- FUNCTIONAL CHECKOUT 29
- TYPICAL CONFIGURATIONS 33
- Supply Voltage 37
- Changing the Fuse 37
- Grounding and Hum 38
- Power-Supply Glitches 39
- Input Coupling 39
- Expansion 40
- Low-Pass Filter 41
- Amplitude Characteristics 42
- Sampling Rate 43
- 10-90% Rise Time 43
- AC Coupling and Autozeroing 44
- 3 dB frequency of 44
- Time Constant 46
- 100 1.6 46
- Saturation 47
- Notch Filter 48
- Overload Detection 49
- Audio Monitor 50
- External Input 51
- Electrode Test 52
- Strain Gauges 55
- Active Probes 56
- Common-Mode Rejection Ratio 57
- Troubleshooting 59
- TRANSDUCERS 61
- Page 44 TRANSDUCERS 62
- TRANSDUCERS Page 45 63
- EMG, EEG, ECG Recording 64
- Nerve Cuffs 65
- Metal Microelectrodes 65
- Page 48 TRANSDUCERS 66
- Pressure 67
- Acceleration 67
- Self Heating 68
- Isolation 68
- Insulation Techniques 68
- AI 400 SERIES SmartProbes 69
- Transducer Adapter 71
- Input Connector Color Scheme 72
- Recommended Input Coupling 73
- Connector 74
- Example Circuits 75
- Basic Thermistor Circuit 76
- Amplifier Probes 78
- Current Probes 79
- Photodiode Amplifier 79
- Linear Potentiometers 80
- Rotary Potentiometers 80
- Panel Switch 81
- Foot Switch 81
- CMD300 CONTROL SOFTWARE 83
- Command-Line Mode 85
- Interactive Mode 85
- Command-File Mode 86
- Command Reference 87
- CMD300 OVERLOAD 91
- CMD300 REPEAT OVERLOAD 94
- QUICK300 CONTROL SOFTWARE 97
- Command Line Options 100
- CyberControl SOFTWARE 101
- Starting CyberControl 102
- Overload Handling 105
- Keyboard Commands 105
- Communications Settings 107
- PC Menus 108
- Macintosh Menus 109
- PROGRAMMER'S GUIDE 112
- Libraries and Example Code 114
- > end of response 116
- AT3F5 24000 118
- 2 4 6 8 10 ... 28000 30000 118
- AT8R06000 121
- D5=-1234500 124
- Implementation Notes 125
- Support Routine Details 125
- Example Programs 129
- SPECIFICATIONS 135
- Page 118 SPECIFICATIONS 136
- Offset range: ±10 V 137
- Page 120 SPECIFICATIONS 138
- SPECIFICATIONS Page 121 139
- Page 122 SPECIFICATIONS 140
- REFERENCES 141
- ADJUSTMENT PROCEDURES 143
- Other Adjustments 144
- CIRCUIT DIAGRAMS Page 127 145
- SERIAL COMMUNICATIONS CABLES 147
- LIST OF FIGURES AND TABLES 149
- WARRANTY 151
- WARNING 153
- INDEX Page 137 155
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