V-3-00-EN
4-meter. User Manual
Operation
Operation
Relative measurement
Relative measurement can be used to determine/verify treatment size
of a phototherapy device.
The example below explains the process for a single sided photo ther-
apy device.
1. Select: Menu - ‘Bottom sensor’ to disable the bottom sensor (see
above)
2. Place 4-meter unit under a phototherapy device in centre position.
3. Select: Menu - ‘Set relative’ to set the current measurement as ref-
erence value
4. Select: Menu - ‘Show relative’ to show the ratio between current
measurement and reference value.
The ratio is shown on the left side of the top sensor bar (‘1.00’).
5. Move 4-meter unit away from centre position, the irradiance should
decrease. This will also be indicated by a decreasing ratio.
In this example 4-meter unit was moved away from centre to a posi-
tion where irradiance is 60% of the centre (reference) irradiance point.
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