Control of Classification Equipment

Manual Ultrasound (Ultrafom)

Principle

Fat thickness measured by reflectance of ultrasound. ULTRA – FOM 300

Known standard deviations
Item	Repeatability s(r)	Reproducibility s(R)	Reliability
1 operator, 1 instrument	5,48	-	Very good
1 operator, 2 instruments	-	5,38	Very good
1 instrument, 3 operators		5,04	Very good
3 instruments, 3 operators		5,05	Very good

Known possibilities for error
Error	Frequency	Error contribution expressed as standard deviation
Dry surface	Very low	Not known
Contact failure between instrument and skin	Very low	Not known
Wrong measurement place	Sometimes*	Not known
Dirty transducer	Very low	Not known

It is of great importance for the daily control, that you are able to check the measurement point after the measurements have taken place. You should therefore only use instruments with a marking device.

It should be noted / documented which instrument that are used, and for each instrument the program version or EPROM number should be recorded to make it possible to track the used algorithm.

Daily control	Periodic control
Control of instrument	Control of instrument
Check paper in the log printer. Morning control of the transducer and system with test block. At the end of each working day the instrument must be cleaned.	Every day Every day Every day
Control of data	Control of data
Every month	Every month