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J17 Instruction Manual
3-7
Color Measurements
This section is included to clarify the function of the
COLOR and START buttons.
COLOR Button
The J17 has a button labeled COLOR for use with
certain heads. Pressing this button and toggling
through the separate colors does not give a readout of
the color component of that source. The button is used
when measuring pure color sources to fine adjust the
sensor calibration to that specific color. For example:
the RED mode should be selected when measuring the
output of a red LED.
When using heads for a broad spectrum of light
sources, us the WHITE setting. Use the color settings
only if you are measuring narrow spectrum light
sources such as lasers and LEDs.
J1820 Measurements
The J1820 is a true color head. Set the COLOR button
to WHITE and then press the START button to get an
accurate reading of the composition of the source.
The default color coordinate system is the x,y system.
To change to the u'v' system, press the UNITS button.
To display the luminance value, press the ALT DISP
button. The default luminance units are cd/m
2
(NITs).
To change to fL (footlamberts), press the UNITS button.
J17 Instruction Manual
3-7
Color Measurements
This section is included to clarify the function of the
COLOR and START buttons.
COLOR Button
The J17 has a button labeled COLOR for use with
certain heads. Pressing this button and toggling
through the separate colors does not give a readout of
the color component of that source. The button is used
when measuring pure color sources to fine adjust the
sensor calibration to that specific color. For example:
the RED mode should be selected when measuring the
output of a red LED.
When using heads for a broad spectrum of light
sources, us the WHITE setting. Use the color settings
only if you are measuring narrow spectrum light
sources such as lasers and LEDs.
J1820 Measurements
The J1820 is a true color head. Set the COLOR button
to WHITE and then press the START button to get an
accurate reading of the composition of the source.
The default color coordinate system is the x,y system.
To change to the u'v' system, press the UNITS button.
To display the luminance value, press the ALT DISP
button. The default luminance units are cd/m
2
(NITs).
To change to fL (footlamberts), press the UNITS button.