Tektronix j17 User Manual download pdf (Page 41)

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This section is included to clarify the function of the

COLOR and START buttons.

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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.

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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

(NITs).

To change to fL (footlamberts), press the UNITS button.