Msp Board (Mco2) Calibration - Welch Allyn PROPAQ CS Service Manual

54 Calibration
MSP Board (MCO
The monitor MSP Board has two calibration adjustments. One adjustment (RP2) is a null
adjust for electromagnetic interference emissions—this adjustment has no effect on
MCO performance/accuracy. The other adjustment (RP1) is a barometric pressure/
2
altimeter setting. This adjustment is set at Welch Allyn during the production calibration
process and does not require readjustment for use at other altitudes.
Note
1. From the monitor Main Menu, press SETUP > MORE > MORE > SERVICE > YES >
CO2 TEST > MAIN TEST and observe the displayed barometric pressure. Verify that
the displayed pressure is within 3 mmHg of the local barometric pressure as
calculated in
2. Adjust RP1 on MSP Board if required to calibrate displayed pressure to specified
limits.
3. Using an oscilloscope with a 1X probe, connect probe tip to TP50 on the MSP Board.
Leave probe groundtip open.
4. Adjust RP2 for minimum high frequency (100kHz) signal.
Note
) calibration
2
"Mainstream CO2 verification procedure"
the verification test results are within specifications, board calibration is not
required. If verification test results exceed specification limits, RP1 calibration
MAY or MAY NOT be required. Before adjusting RP1, check test parameters as
indicated in the table "Possible sources of CO2 verification test errors"
page 35 to minimize testing errors. Determine local barometric pressure as
described in the table "Local uncorrected barometric pressure (LUP) as a function
of altitude (feet)" on page 31 to verify monitor barometer setting. Adjust RP1, if
required, as instructed below.
"Local barometric pressure"
WARNING You must perform a functional verification after calibrating the Propaq
CS monitor to ensure all monitoring functions and safety features operate
normally.
Because the battery was disconnected in the calibration procedures, you will
need to reset the time, date and all saved settings. See the Propaq CS Directions
For Use for information on resetting these parameters.
Welch Allyn Propaq CS Vital Signs Monitor
on page 34 verifies MCO
on page 30.
accuracy. if
2
on