LACERTA PWM Dimmer for Flat-Field-Boxes
Product.Nr.:
LA#Dimmer30kHz
Manufacturer: LACERTA
49,00 EUR
incl. 19 % VAT
-
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- delivery time : 1-2 Tage
- weight 0,14 kg
products condition NewCondition
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product description
- Dimmable, flicker-free control box for flat field boxes, heating stripes, etc.
- Input: 12 to 24V DC voltage
When regulating the brightness of a Flat-Field-Box (FFB) for astronomical CCD cameras, we need vibration-free AND extremely short exposure times in the (sub) millisecond range. Unfortunately, conventional dimmers cannot be considered for this, only so-called pulse width modulation (PWM) with an on and off frequency of 25 kHz or even faster!
What is PWM and why do we use it?
Theoretically, it would be sufficient to reduce the voltage with an ohmic resistor if we wanted to dim light bulbs rather than LEDs. However, we absolutely need a dimmer with pulse width modulation that regulates the time interval in which the full voltage is effective: The regulating instrument is switched on and off in quick succession.
Depending on the switch-off / switch-on frequency, various accessories can be operated: for a heating stripes, switching it on and off once per second would be enough, or even less, because its inertia is very high. In everyday life, around a hundred cycles per second are sufficient for such dimmed LED lights (e.g. living room lighting), because the human eye can hardly perceive the flickering from a frequency of 25 Hz. For Fla-tField-Boxes (FFB), which are built for astronomical CCD cameras, at least 25kHz is required in order to be able to guarantee a uniformly illuminated surface even in a short lighting time.
Technical specifications
- Input : RCA and 5.5 / 2.1 mm (note polarity: center positive)
- Output : RCA and 5.5 / 2.1mm (note polarity: center positive)
- Frequency : over 30 kHz, typically 31-36 kHz (guaranteed to switch on and off more than 30,000 times per second)
- Maximum current : 3 A
- Input voltage range : 12 - 24 V
- Cable length : with additional cable 230 cm (included)
- Weight : 130 g
RCA and 5.5 / 2.1 mm plugs can be used
Due to the different flat field boxes (FFB) we offer a combination solution: both RCA-RCA and a 5.5 / 2.1 - 5.5 / 2.1 mm connection are possible. The total length of the connected cables (including the dimmer unit) is around 230 cm.
Scope of Delivery
- LACERTA PWM Dimmer for Flat-Field-Boxes
- 2 m cable with RCA-5.5 / 2.1 mm adaption
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