V-3-00-EN
4-meter. User Manual
Device Description
Explosion hazard. Do not use this device in the presence of
flammables (e.g., oxygen, nitrous oxide, anesthetics).
Read and be familiar with this instruction manual before
using this device.
Inspect this device before each use to ensure proper
functioning.
!
!
!
The hospital/facility is responsible for ensuring that all per-
sonnel who operate or maintain this device are trained in its
operation and safe use, and for maintaining training records
of attendance and evidence of understanding.
Warnings
09
08
Measuring Irradiance
4-meter is a spectroradiometer that measures the therapeutic irradi-
ance (radiant power) of neonatal phototherapy lights. It measures the
irradiance of the wavelengths from 400 to 520 nanometers (nm), the
blue-green portion of the spectrum, which includes the principal ac-
tion spectrum of bilirubin. The device accounts for cosine correction
allowing more light from different angles.
Units of Measurement
4-meter measures relative irradiance (µW/cm
2
/nm) and absolute ir-
radiance (µW/cm
2
).
When referring to the relative irradiance, a nanometer is a measure
of wavelength equal to one-billionth of a centimetre. The term “per
nanometer” indicates the average irradiance per nanometer across
the spectral band being measured, which is 120 nm wide. This makes
it possible to compare average irradiance across spectral bands of
different widths.
Instrument Response Characteristics
The figure below represents the nominal response characteristics of
4-meter, which matches the action spectrum of bilirubin as closely
as possible.
390
25
50
75
100
400 410 420 430 440
Wavelength
%
440 450 460 470 480 490 500 510 520 530
