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DC2200
3.3.3 PWM Mode
PWM stands for Pulse Width Modulation. In PWM mode the DC2200 generates rectangular
pulses with
· adjustable frequency (0.1 Hz to 20 kHz)
· adjustable duty cycle (0.1 % to 99.9 %)
· adjustable pulse count (1 to 1000; infinite)
The pulse amplitude is given by the set value of the LED current, in other words, the LED cur-
rent is modulated by a train of rectangular pulses. The graphics below illustrates the Duty
Cycle parameter:
· Set the LED Current: This will be the current supplied to the LED while it is switched on. It
can be adjusted between 0 and the indicated above LED Current Limit .
· Set the Frequency.
· Set the Duty Cycle.
· Set the number of counts. "Infinite" is set by decreasing below 1.
Note
In PWM Mode, at the SMA MOD IN/OUT connector (4) at the rear panel the internal modula-
tion signal is reproduced as a TTL signal.
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