Starting The System; Power Modes; Pwm (Pulse Width Modulation) - Image Engineering LG4 User Manual

3.3

Starting the system

The powerswitch (F) is located on the upper side of the control unit.

3.3.1 Power modes

The LG4 provides two intensity modes for the illumination
•
NORM: 32 kHz PWM, variable duty cycle
•
LOW: 32 kHz PWM, variable duty cycle approximately 1/10 of the NORM Mode power
output
Switch between the power modes by pushing and holding the rotary knob (B)

3.3.2 PWM (Pulse Width Modulation)

The LG4 uses pulse width modulation (PWM) to control illumination levels. The high frequency of 32
kHz allows a flicker-free image acquisition for most cameras. The constant current has the benefit of a
constant correlated color temperature.
Puls Width Modulation with 32 kHz (simplified
0 0,01 0,02
Relative Intensity
LED intensity over time at 32 kHz pulse width modulation with 50% duty cycle
Image Engineering
representation)
0,03 0,04 0,05
Time [ms]
Period
0,06 0,07 0,08
Time_on Time_off
0,09 0,1
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