Service manual

42 Calibration Welch Allyn Propaq Encore Vital Signs Monitor
9. Set the simulator to 200mmHg.
10. Check that P2 displays 200mmHg ±2 mmHg.
11. Disconnect all patient cables from the left side panel.
12. Reinstall the Analog board shield and torque it according to the procedure in “Repair
Procedures” on page 47.
MSP Board (MCO
2
) Calibration
The Propaq MSP board has two calibration adjustments. One adjustment (RP2) is a null
adjust for electromagnetic interference emissions—this adjustment has no effect on
MCO
2
performance/accuracy. The other adjustment (RP1) is a barometric pressure/
altimeter setting. This adjustment is set at Welch Allyn during the production calibration
process and does not require readjustment for use at other altitudes.
1. From Propaq main menu, push SETUP > MORE > MORE > SERVICE > YES > CO
2
TEST > MAIN TST and observe the displayed barometric pressure. Check that the
displayed pressure is within 3mmHg of the local barometric pressure as calculated in
Functional Verification.
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
“Functional Verification” on page 11 provides a procedure to verify MCO
2
accuracy. if 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 “Local Uncorrected Barometric Pressure
(LUP) as a Function of Altitude (Feet)” on page 27 to minimize testing errors.
Determine local barometric pressure as described in “Local barometric pressure”
on page 26 to verify Propaq barometer setting. Adjust RP1, if required, as
instructed below.
WARNING You must perform a functional verification after calibrating the Propaq
Encore to ensure all monitoring functions and safety features operate normally.
Note
Because the battery was disconnected in the calibration procedures, you will
need to reset the time, date and all saved settings. See the Propaq Encore
Reference Guide for information on resetting these parameters.