Microsoft LPF-00004 Manual del operador Pagina 56
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- Tabla de contenidos
- SOLUCIÓN DE PROBLEMAS
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
Page 38 PRINCIPLES OF OPERATION
C
YBER
A
MP
380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.
Active Probes
Active SmartProbes have headstages in which signal amplification occurs before the signal is fed to
the CyberAmp. Support for the Electrode Test facility is generally not as straightforward as in
passive probes. There are two basic reasons for this. First, it is undesirable for most active probes to
have 1 MΩ resistors connected to their inputs; this would decrease the input resistance and perhaps
degrade the noise performance. Second, there is no simple way to selectively ground one input while
measuring the resistance of the electrode on the other input. The circuitry to selectively ground the
positive or negative inputs resides in the CyberAmp and not in the probe.
Nevertheless, some provisions have been made to support an Electrode Test on the active probes. The
Electrode Test for some of these probes operates as follows:
1) AI 401, x10 amplifier probe
AI 402, x50 amplifier probe
AI 405, x10 amplifier probe
A test socket near the inputs is connected to a 1 MΩ resistor that in turn is connected to the
signal called "Electrode Test". This signal is normally equal to ground. When the CyberAmp
Electrode Test is selected, the ground is replaced by the same 1 V
p-p
, 10 Hz square wave that
is used internally in the CyberAmp to test the electrode resistance.
To test the electrode resistance, the operator must connect the TEST jack output to one of the
inputs, leaving the electrode leads plugged into the input jacks. The clip lead provided with
the headstage is suitable for this purpose. The measured signal corresponds to electrode
resistance exactly as described above.
2) AI 40, x50 isolated amplifier probe
Two buttons are provided to independently connect the positive or the negative input of the
probe to a test current waveform. The waveform is isolated from ground.
To test the resistance of an electrode the operator simply pushes the button corresponding to
the electrode to be tested, and observes the resulting voltage response.
3) AI 403 picoammeter probe
This probe is intended for recording extremely small currents. The presence of permanently
connected test resistors at the input would severely degrade the noise performance.
A test socket near the inputs is connected via a 10 kΩ protection resistor to the signal called
"Electrode Test". This signal is normally equal to ground. When the CyberAmp Electrode
Test is selected, the ground is replaced by the same 1 V
p-p
, 10 Hz square wave that is used
internally in the CyberAmp to test the electrode resistance.
During test mode, the signal on the test socket can be used to measure resistances greater than
1 GΩ. That is, the headstage can be used as a sensitive ohmmeter for ultra-high impedance
resistors.
To test the electrode resistance, the operator must plug one end of the resistor into the input
jack and connect the other end of the resistor to the TEST jack, normally using the clip lead
provided with the headstage. The 1 V
p-p
, 10 Hz square wave drives a current through the
- 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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