[time-nuts] Why are 1PPS signals so skinny?
mblazer at satx.rr.com
Thu May 17 00:01:27 UTC 2012
I always thought it was nice to have the pretty LEDs showing the power
supplies are working, but then you have to find the one that's not lit.
I've seen others that have a 'fail' indicator, but if the power supply
is dead, what powers the fail LED.
The B-1B test stations have an interface board with status LEDs behind a
smoked plexiglass door. One version of the CCA has the 90° LEDs facing
On 5/15/2012 10:25 PM, Hal Murray wrote:
> richard at karlquist.com said:
>> FWIW, the E1938A oscillator control board had a "happy light" LED that
>> flashed 1 time per second, and sure enough this corrupted the power supply
>> and affected some applications. We added a command to turn it off.
> Why should lights blink when they are happy?
> Your eye is real good at noticing blinking things. Why not use blinking for
> things that are broken and need attention?
> Of course, with a PPS, blinking is an obvious thing to do: 1 resistor, 1 LED,
> your eye does all the work.
> I built a converter from blink on happy to blink on sad. I've been happy
> with it.
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