This video demonstration is on the RC4Magic S3 DMX4dim device.
ISSUE : Banding, beating, and other visual artifacts can be an issue when working with video. In this example, both dimmers start at the default setting of 615Hz.
FIX : Increasing the PWM frequency resolves this: Press and hold the Set B ButtonSet B ButtonAll RC4 dimmers have Set buttons for each individual dimmer output. The second button is the Set B button. On a 2-channel device these are Set A and Set B buttons. A 4-channel device adds Set C and Set D. The most common use of the Set button is to assign a DMX channel and […]
Read more » and it will flash a pattern on DimA and DimB outputs to indicate that a PWM frequencyPWM frequencyPWM stands for Pulse-Width Modulation. It is a method for using a switching device (one that can only be on or off) to create what appears to be analog changes in level. This is done by switching on and off at a high speed and varying the proportion of the time for each. For example, of the […]
Read more » increment has been made. It will automatically move to the next available frequency. The flashing pattern is different for each available frequency, indicating which frequency has been selected.
NOTE: The default PWM frequency is different for different system families:
RC4 LumenDim and W-DIM dimmers default to 5kHz, ideal for video capture at normal frame rates
Each long-press of the Set B button increments to the next PWM frequency:
- 615Hz (default)
- The next long-press cycles back to #1 (615Hz)
The correct PWM frequency will eliminate visible artifacts:
A. The flashing pattern on DimA/DimB is different for each available frequency, indicating which frequency has been selected.
B. A chart of PWM frequencies clarifies all of this.