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: [email protected]
> To: [email protected]
> 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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