SECTION 10: CIRCUIT DESCRIPTION
Part No. 715-0080, Rev. B
- 85 -
SATURATION, PULSE, OXYGEN, AND PULSE GRAPH DISPLAYS (OPTIONAL FEATURES)
The seven-segment display LEDs (
DS20
-
DS28
), the display mode LEDs (
D38
-
D44
), and the
horizontal bar graph of the pulse amplitude (
D45
-
D49
) (all located on the main display board) are
updated at 120 Hz and are driven by current source array
U21
. This refresh rate is established by the
microcontroller, which activates the common cathodes for each display component using open
collector Darlington array
U12
and
U20
,
with some of the selection done via the 3 to 8 line decoder
U23
.
ALARM AND POWER INDICATORS (OPTIONAL FEATURES)
The low oxygen limit below 21% warning LED and the alarm are driven by
U12
. The alarm is the
same one as is used by the incubator so the mute circuitry will shut down all audible alarms.
ALARM SETPOINTS (OPTIONAL FEATURE)
The high and low alarm levels are entered from the membrane keypad as described in the Operator’s
Manual. The microcontroller firmware then compares the setpoints to the serially communicated
inputs from the pulse oximetry board and the serial data from the analog to digital converter, which is
in turn connected to an instrumentation amplifier with a gain of 1 on the oxygen reading level. These
setpoints are stored in the EPROM included in the microprocessor
U19
.
SETPOINT ALARM (OPTIONAL FEATURE)
This alarm activates when any reading is greater than its respective high setpoints or lower than its low
setpoint. The display will flash HI or LO in the appropriate display at a rate as determined by the alarm
severity. An audio alarm sounds three times every three seconds for a medium priority alarm, and two
times every three seconds for a low priority alarm until the incubator alarming condition is removed or
the incubator is turned off.
OTHER ALARM AND WARNING CONDITIONS
All alarm conditions including error codes are detailed in the operator’s manual and in SECTION 7 of
this Service manual.
Содержание AirBORNE A750i
Страница 1: ...A750i Transport Incubator Service Manual...
Страница 6: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 4 SCLAIM MER...
Страница 7: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 5 SCLAIM MER...
Страница 8: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 6 SCLAIM MER...
Страница 9: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 7 SCLAIM MER...
Страница 10: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 8 SCLAIM MER...
Страница 11: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 9 SCLAIM MER...
Страница 12: ...Par rt No 715 008 80 Rev B LA ANGUAG GE DIS 10 SCLAIM MER...
Страница 102: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B CONTROL SCHEM L BOARD S MATICS SCHEMAT DRAW TIC 001 51 WINGS 81 100...
Страница 103: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM PULSE MATICS OX DISPLA DRAW AY BOARD WINGS D SCHEMA ATIC 001 5 5193 101...
Страница 104: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM MATICS DRAW WINGS 102...
Страница 105: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM MATICS DRAW WINGS 103...
Страница 106: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM MATICS DRAW WINGS 104...
Страница 107: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM MATICS DRAW WINGS 105...
Страница 108: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM MATICS DRAW WINGS 106...
Страница 110: ...S Par ECTION rt No 715 008 N 14 S 80 Rev B SCHEM MATICS DRAW WINGS 108...
Страница 112: ...S Par ECTION rt No 715 008 SCHE N 14 S 80 Rev B MATIC PN SCHEM NEUMATIC MATICS C A750i CA DRAW ART 002 40 WINGS 010 110...