Advanced lluminated Pulsar 710 Manual del operador descargar pdf (Pagina 12)

a d v a n c e d i l l u m i n a t i o n . c o m

P u l s a r 7 1 0 M a n u a l

4.1.5.1 LED Forward Voltage: The forward voltage drop across an

LED (V

) depends upon the nature of the semiconductor junction and the

currentthroughtheLED.ThespeciedV

for an LED is usually given at its

recommended operating current. Please note that when driven by high

current pulses, V

can increase by 10 to 20 times. For this reason voltage

levels at the Pulsar 710 output can be as high as 100 volts.

4.1.5.2 LED Thermal Resistance: A measure of the temperature

difference between the LED junction and the LED connection to an

external heat sink. Overheating of the junction is the primary cause of

failure in LEDs. The value of the LED thermal resistance, combined with

the heat sink thermal resistance and the overall thermal time constant

determine the maximum pulse width, pulse current, and duty cycle of the

light head.

4.1.5.3 LED Voltage Slope: The relationship between V

and the

forward current I

,usedbySignatechIItocalculatethevoltagerequired

to provide the desired current.

4.1.5.4 Lighthead Characteristics: Also contained within the data

provided by Signatech II to the Pulsar 710 are the number and type of

LEDs in each string and the number of parallel strings connected to each

channel.

4.1.6 Period: The length of time between two successive pulses or the

reciprocalofthepulsefrequency.

4.1.7 Pulse Width: The length of time the light head is activated by the

Pulsar 710. This is typically measured between the 50% amplitude points

of the pulse.

4.1.8 Repetition Rate: The rate at which successive pulses are initiated.

Alsoknownasfrequency,whichismeasuredinHertz(cyclespersecond).

Repetition rate is usually multiple times per second.

4.1.9 Signatech II: A proprietary feature of Ai light heads and the Pulsar

710.SignatechidentiesthetypeoflightheadconnectedtothePulsar

710 and maintains safe operating limits for each type. The Pulsar 710 can

be set so that Signatech preferentially limits pulse current, pulse width,

or period to remain within the safe power dissipation range of the light

head.

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Advanced lluminated Pulsar 710 Manual del operador Pagina 12