Welch Allyn Spot Vital Signs 4400 Service Manual page 73

Service manual
Test
Accuracy (Temp)
Temperature functional
check
SpO2 functional check
Display
Back light interface
Touchscreen interface
LED
Beeper
Battery operation
¹ POST testing checks the following:
• NIBP: ROM, RAM, A/D channels, calibration, and user configuration.
Temperature: ROM, RAM, calibration, and heater.
•
SpO2: ROM and RAM, and connection to the SpO2 board.
•
² SureTemp Plus only.
Electrical safety testing
Welch Allyn recommends performing ground continuity and leakage current tests after all open-
case repairs and dielectric strength testing is not recommended.
These recommendations trace to EN/IEC 60601-1 – Medical Electrical Equipment – Part 1: General
Requirements for Basic Safety and Essential Performance or EN/IEC 62353 – Medical Electrical
Equipment – Recurrent Test and Test After Repair of Medical Electrical Equipment.
Because of the variability of test equipment in the field, Welch Allyn does not include specific
instructions to perform electrical safety tests. When performing electrical safety tests, refer to your
test equipment manuals for detailed instructions to ensure proper test equipment setup that aligns
with the appropriate standard. The following table provides connections and test limits to assist
you in performing these tests.
Description
Verifies the accuracy of the thermometer across
range
Verifies temperature module with cal-key²
Verifies module operation with an SpO2
simulator
Verifies video output
Verifies display LED back light
Verifies touchscreen calibration
Verifies the LED
Verifies the buzzer
Verifies the internal battery
NOTE Perform dielectric strength testing only if there is a reason to doubt the
integrity of the electrical insulation (e.g. multiple trips of a residual-current device
or liquid ingress of a saline solution). If you determine this test should be
performed, return the device to Welch Allyn for service.
Functional verification and calibration overview 69
NIBP Temp SpO2 Host