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