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Page 58 MAKING YOUR OWN ADAPTER OR ACTIVE PROBE
C
YBER
A
MP
380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.
Series 700 Thermilinear Circuit
T
1
2
T
2
U
R5
6R25
0.1%
0.1%
3K20
R4
U
1
1.87 V
R2
250
0.1%
0.1%
3K13
R1
R3
1K6
0.1%
5.000 V
( 4 )
INPUT
( 1 )
INPUT
( 2 )
( 10 )
ANALOG GROUND
1.62 V
Figure 20. Circuit for Yellow Springs Instrument Co. (YSI) series 700 temperature measurement probes.
Probes plug into a phone jack. T1 and T2 are the two thermistor connections inside the probe. The 1.62 V DC
level on the + input of the CyberAmp shifts the output to obtain 0 V at 0°C. The change in voltage at T2 is
negative for increasing temperature, therefore the negative input of the CyberAmp is used so that the CyberAmp
output will increase with increasing temperature. The sensitivity is 10 mV/°C.
Precision resistors for R5 and R4 are required. R1, R2 and R3 may be replaced with trim pots. Alternatively,
low precision resistors can be used for R1, R2 and R3 if scale factor and offset corrections are implemented in
the software.
Basic Thermistor Circuit
Figure 21. In this simple voltage-divider
network, the inherent output decreases with
temperature, but since it is connected to the
negative input of the CyberAmp, the
CyberAmp output increases with
temperature. The output voltage is
reasonably linear for a small range of
temperatures. The thermistor
manufacturer's charts must be consulted to
determine the optimum values of R1 and
R2. R2 reduces the voltage drop across the
thermistor, thereby minimizing the self
heating.
A trim pot can be connected to the positive
input to zero the 0°C temperature reading.
Alternatively, this can be achieved using the
Autozeroing function of the CyberAmp, or in
R1
5.000 V
( 4 )
INPUT
( 2 )
ANALOG GROUND
( 10 )
- 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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