Title: 8500 Adjustment & Calibration Document No: 129AC000 Sheet 10 of 12
BLEASE QUALITY DOCUMENT
BQD 083.V2
25/5/94
4.15 0
2
Monitor Calibration
Hardware Calibration
Short TP2 And TP3
Rotate VR2 fully anti clockwise when viewed from the back looking at the adjusting screw.
Adjust VR1 until just greater than 2.52V on TP1 and display turns to OFF.
Remove link and connect O
2
sensor simulator to rear panel socket.
Set O
2
sensor simulator to 100 then set VR2 fully clockwise and note that display reads over
100%. Also TP1 must be lower then 1.3V
Adjust VR2 until display reads approximately 1.28V on TP1.
Set O
2
sensor simulator to 0. Check that no more than 2.49V on TP1. Check that display reads
off when the sensor has been unplugged.
Software Calibration
Put 8500 into standby.
Press the menu button, and then select oxygen calibration.
Set the O
2
sensor simulator to 100%.
Select the oxygen figure; use the trakwheel to change the number to 100. Push the Trak wheel to
accept. Return to main screen.
Set O
2
sensor simulator to 50 check display reads 50% ±2%
Set O
2
sensor simulator to 21 check display reads 21% ±2%
Disconnect the O
2
sensor simulator. Check the display shows OFF.
4.16 PEEP Calibration
Put unit into run mode.
Connect a scope probe to the connector PL8 pin 1 on the PSU board.
Run the 8500 with 500ml MV/TV, 12BPM, 1:2.0 Ratio.
Place a link on JP3 (2
nd
pair from the left) to disable feedback.
Adjust the PEEP setting from OFF to 3
Adjust VR1 on the PEEP Control board (part no.10101550) until the ripple is just visible below
the 26V line.
Set the PEEP Control to 20 cm H
2
O.
Adjust VR2 to give an indicated 20 cmH
2
O of PEEP on the bar graph.
Recheck that when PEEP is turned off, no PEEP is shown on the bar graph.
Remove the link on JP3.
Check that when PEEP is set to 20 cmH
2
O the indicated PEEP level gradually increases over 4
or 5 breaths to the set value.
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