Microsoft LPF-00004 Manuel de l'opérateur Page 55
- Page / 157
- Table des matières
- DEPANNAGE
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
PRINCIPLES OF OPERATION Page 37
C
YBER
A
MP
380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.
Input Coupling
To properly measure the electrode impedance, one input on each channel should be grounded while
the other input is DC coupled. This is very important. If the electrodes on both inputs of a channel
have the same resistance and neither input is grounded during the Electrode Test measurement, then
the measurement will indicate that the total resistance is 0 kΩ. This is clearly wrong and is due to the
fact that measurements in the CyberAmp always report the difference between the signals on the
positive and negative inputs.
The total gain in the CyberAmp is often set to x10 for the Electrode Test measurement. If a higher
gain is used the acquired voltage should be divided by the gain to calculate V
in
.
If it is not practical to DC couple the input, AC coupling at 0.1 Hz is sufficient.
Strain Gauges
When using the Electrode Test facility with strain gages it is important to correctly interpret the
resistance measurement and the DC levels.
1) A typical gauge is shown in Figure 17. Each arm of the Bridge is nominally 350 Ω. Looking
back at the gauge from the positive input, the input resistance (R
in
) is R3//R4 = 175 Ω.
Similarly, looking back at the gauge from the negative input, the resistance is R1//R2 = 175 Ω.
2) During the Electrode Test measurement, one of the inputs must be grounded while the
resistance at the other input is tested. If the negative input in Figure 17 is grounded the positive
input sees the 2.5 V
dc
level as well as the 10 Hz signal due to the approximately 1 µA test
waveform. The response to this waveform is about 175 µV
p-p
(175 Ω x 1 µA
p-p
).
The simplest way to record this small peak-to-peak voltage against a large DC background is to
AC couple the positive input at 0.1 Hz. (Remember, the negative input is grounded in this
example.) The response to the test waveform will be marginally distorted by AC coupling at
0.1 Hz, but the accuracy of the resistance measurement will not be affected.
R3
R1
R2
R4
2.5 V
350
350
350
350
2.5 V
INPUT
INPUT
R
in
= 175
Ω
= 175
Ω
in
R
ANALOG GROUND
5.000 V
Figure 17. Special considerations when using Electrode Test with a strain gauge.
- 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
Produits connexes et manuels pour Mesure, test et contrôle Microsoft LPF-00004
(82 pages)© 2020, manymanuals.fr. Tous droits réservés | 0.050 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels