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Evertz Technical Bulletin
Dated: 94/8/09
Revised:
94/8/09
Filename:
B_INTENS.DOC
Product Software Version:
Engineer:
GDW
Product:
5500 KeyKode Reader
Topic: LED Intensity Control
Comments:
Tutorial
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The Evertz model 5500 Key Code Reader controls the brightness of the illuminating LED in order to
accommodate for the various exposure densities of the keykode on the film. The LED intensity control
can be either manually controlled by the user or automatically controlled by the 5500.
Manual control can be selected by:
1)
Use the SETUP key to enter the SETUP menu mode.
2)
Use the up and down arrows to find the item that shows either "KK AUTO INTENS" or "KK MAN
INTENS".
3)
Use the left or right arrows to select "KK MAN INTENS".
4)
Use the up and down arrows to find the item that shows something similar to "KK INTENS= 321".
5)
Use the left and right arrows or the shift+left and shift+right arrows to alter the 3 digit intensity
value. These values will range from a maximum of 999 to a lower limit which will probably be
somewhere in the 100-250 range and will show as "KK INTENS =LIMIT". (See Note 1)
6)
When the film is traveling over the pickup head, adjust the intensity setting until the 5500 beeps
or blinks to indicate keykode is being read.
7)
Press the display key until the display shows something similar to "BARCOD ASYM +20%",
which stands for bar-code asymmetry.
asymmetry approaches 0%. The LED intensity is now at the optimum value for reading this
particular bar-code.
illuminated enough to be readable but not necessarily optimal and 2) when the keykode is not
readable at all (the 'hunt' range).
Whenever "KK AUTO INTENS" is selected (see above) the 5500 evaluates each bar-code that is read
and adjusts the illumination for the next bar-code in an attempt to find the optimal intensity setting. This
can be seen by watching the KK INTENS item of the SETUP menu. This value will wander around a
small range as it adjusts for variations in film density, film position, film direction and film velocity.
This auto activity can be enhanced by:
1)
Use the SHIFT+SETUP key to enter the Engineering SETUP menu mode.
B_INTENS.DOC
5288 John Lucas Drive, Burlington, Ontario, Canada, L7L 5Z9
Adjust the KK INTENS value (as above) until the
Automatic control falls into two categories:
Page 1 of 2
Evertz Microsystems Ltd.
Tech Support: Phone 905-335-3700
Fax 905-335-3573
Internet: eng@evertz.com
1) when the bar-code is
94/8/25
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