8
Selecting Dimmer Curves
The dimming curve can be set individually for each 5A Dimmer output. The D4 Dimmer has an
eight position DIP Switch with two positions for each dimmer output.
Dimmer
Switch
1
Switch
2
Switch
3
Switch
4
Switch
5
Switch
6
Switch
7
Switch
8
Function
A
OFF OFF
Normal Dimming, ISL Curve
OFF ON
NON - DIM
ON OFF
Linear Dimming Curve
ON ON
LED Curve
B
OFF
OFF
Normal Dimming, ISL Curve
OFF
ON
NON - DIM
ON
OFF
Linear Dimming Curve
ON
ON
LED Curve
C
OFF
OFF
Normal Dimming, ISL Curve
OFF
ON
NON - DIM
ON
OFF
Linear Dimming Curve
ON
ON
LED Curve
D
OFF
OFF
Normal Dimming, ISL Curve
OFF
ON
NON - DIM
ON
OFF
Linear Dimming Curve
ON ON
LED
Curve
The ISL (Inverse Square Law) Curve is intended for incandescent lamp dimming and is similar
to a conventional mains-powered lighting dimmer curve. The PWM period for ISL is 60Hz.
The NON-DIM function is intended for relays and other devices requiring switched power
without PWM dimming.
The Linear Curve is a simple linear scale that can be used to drive DC integrators or other
devices where linear response needed. The Linear PWM period is 60Hz.
The LED Curve is intended for controlling LEDs but may be used for other specialized loads.
The LED Curve Modes have been optimized for flicker free performance in TV and Film
applications. All settings have been camera tested with motion picture film and digital cameras.
The settings are different to allow compensation for variations in shutter speed and shutter
angle. A camera test is recommended to confirm the correct setting has been selected.
The Mode Settings include TV/Film Mode 1 - 4 which are DIP selectable, and TV/Film Mode 5
which is selectable via RDM only using the MODULATION_FREQUENCY RDM parameter.
The SHoW DMX Neo D4 Dimmer has a two position DIP switch for setting the TV/Film Mode: