Both deliberate, according to the trainer who taught us to fix them years
ago. He was quite pleased with these "features", in fact.
In the first case, as the power in the main cap is reduced, the duration of
the output has to increase to compensate for the reduced intensity of the
light. The latter just makes sense.
Mark Marr-Lyon wrote:
> I used an oscilloscope a while ago, and found the same thing. The
> flash starts at about 10-12 kHz, and then the frequency increases to 18
> kHz or so. As you might expect, the brightness of each "flashlet"
> decreases over time since the capacitor is being discharged, but since
> the frequency is increasing the overall brightness must remain
> relatively constant. I don't know if this is from the Oly designers
> being very clever, or just a happy coincidence of how each flashlet is
> triggered (or a bit of both). Also, the flash does stop pulsing when
> the second curtain closes, thereby causing the recycle time to decrease
> for faster shutter speeds.
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