[volt-nuts] Finally got around to modifying my Fluke 845ab with LED's

Dallas Smith dosmith at outlook.com
Tue Sep 9 19:06:10 EDT 2014

I thought that might be the case, the scope waveform shows
no problem. The white LED has multiple spectra output, thought it might have a
better chance having the right wave length, the extra brightness seems to help
with the deficiencies.

> From: holrum at hotmail.com
> To: volt-nuts at febo.com
> Date: Tue, 9 Sep 2014 22:33:45 +0000
> Subject: [volt-nuts] Finally got around to modifying my Fluke 845ab	with	LED's
> I would probably use green or yellow LEDs,  but the white ones should not be a problem. 
>  I built an LED analyzer/integrating sphere and one of the features is a circuit that optically measures the LED driver PWM frequency.  It can also detect the minute variance in LED intensity from an LED driven by a 950 kHz boost converter.  It also had no problems with a white LED driven at 4 MHz from a signal generator.  You see the long persistence phosphors mainly in large lighting LEDs and not in small indicator LEDs. 		 	   		  
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