Blood Pressure Calibration - Welch Allyn Spot Vital Signs LXi Service Manual

54 Calibration and Verification

Blood pressure calibration

Note
Equipment:
Note
• Pneumatic test assembly (see "Pneumatic test
assembly setup" on page 50)
• Standard blood pressure cuff, size 11 (adult)
preferred
• Power supply, 0 to 10 volts, 2 amps capacity or
better
To initialize the NIBP board:
1. Open repair tool (Ver 3.0 or greater) and click Calibrate > Reset Defaults. The Reset
Defaults window displays.
2. Click Reset > Initialize > OK. The NIBP board is initialized. Perform the blood
pressure calibration section.
To perform the blood pressure calibration
1. Disconnect battery, connect the power supply, and set to 6.5 volts dc. Otherwise
leave power supply as it is from
2. On the service computer select Calibrate > Pressure.
3. Power on UUT in configuration mode (press the check button and power on the UUT).
Hold check button until the UUT beeps twice. The configuration screen displays, scroll
to Blood Pressure and select it. Select BP Calibration Check.
4. Connect the hose to the 500cc cylinder of the test volume and verify the following:
•
•
•
5. On the computer screen select Calibrate Zero button.
6. Press the NIBP button to close valve on UUT and use the squeeze bulb to manually
inflate the UUT to 200 mmHg. Let stabilize. Enter the pressure meter reading in the
Calibration Gain Field on the service computer. Be as precise as possible. If
pressure meter has resolution of 1 mmHg make sure it reads 200 without switching
to 199 or 201. Enter 200.00 in Calibration Gain Field.
7 . Click Calibrate Gain on the service computer.
8. Click OK to accept the inputs. Click Yes to make the changes permanent.
This section updates the pressure calibration of the UUT.
If all readings were within specifications during
page 52, skip this section and go to
See "Tool list" on page 101 for equipment part numbers.
the pressure is at zero mmHg,
the bleed screw on squeeze bulb is closed,
valve on UUT is in the open state.
"Pressure verification test"
"Functional tests" on page
• Digital voltage meter
• Battery connector simulator
• UUT
"Pressure verification test"
Welch Allyn Spot Vital Signs LXi
on
56.
on page 52.