B30 Patient Monitor
1-38
Document no
.
2044677-001
Figure 22
Pressure measurement principle
Pulse oximetry measurement section
LED control signals
The D/A converters of the microcontroller on the STP board set the LED intensity adjustment
values for the infrared and red LEDs of the SpO
2
probe. The microcontroller on the STP board
switches ON (to the adjusted intensity) and OFF the SpO
2
probe LEDs according to the
predetermined sequence.
LED driving circuit
Differential amplifiers measure the LED currents (LED current indication) of the SpO
2
probe over
the shunt resistors placed in the LED current paths. The LED driving voltages (LED voltage
indication) are measured from the driver circuitry. The LED driving circuits also have MOSFET
transistor matrix to enable the use of different probe configurations.
Measured signal preamplification
The preamplifier is a bipolar/single-ended current-to-voltage converter with adjustable gain. A
higher gain is used for measuring thin tissue. The preamplification stage has also ambient light
reduction and a second amplifier stage.
Input filter
Instrumentation
amplifier
to AD converter
Vout
G
P
S
M
_pressur
e_meas_
p
rinci
p
le
.v
sd
Current
measurement
G
to AD converter
Vin
Pressure
transducer
Содержание b30
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Страница 12: ...B30 Patient Monitor 8 Document no 2044677 001...
Страница 13: ...1 Introduction...
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Страница 61: ...2 Installation...
Страница 69: ...3 Maintenance...
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Страница 105: ...4 Troubleshooting...
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Страница 125: ...5 Service Menu...
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Страница 151: ...Parameters 5 25 Document no 2044677 001 4 4 4 NIBP Buttons Leds Buttons Leds Data Not in use in B30 Monitor...
Страница 158: ...B30 Patient Monitor 5 32 Document no 2044677 001...
Страница 159: ...6 Field replaceable unit...
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Страница 166: ...B30 Patient Monitor 6 6 Document no 2044677 001 1 6 Frame for B30 Frame for B30...
Страница 183: ...Frame disassembly 6 23 Document no 2044677 001...
Страница 190: ...B30 Patient Monitor 6 30 Document no 2044677 001...
Страница 191: ...7 Technical specification...
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Страница 198: ...B30 Patient Monitor 7 6 Document no 2044677 001...
Страница 199: ...8 N F C REC Module...
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Страница 238: ...B30 Patient Monitor A 6 Document no 2044677 001...
Страница 244: ...B30 Patient Monitor C 2 Document no 2044677 001 Notes Signature Functional Inspection OK N A Fail...
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