Thanks, Moose. You will probably see that I worked it out, as I responded
to Chuck. My flash unit triggers with 20.5 volts with new batteries, but
the E-510 is limited to 6 volts. I think there is an interface that will
protect the camera circuit, but I have not pursued that. A newer flash
might be a better investment.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, August 18, 2010 11:15 PM
Subject: Re: [OM] IMG: Applying Fill Flash
> On 8/18/2010 8:01 PM, Jim Nichols wrote:
>> Hi Chuck,
>>
>> How would one go about measuring the circuit voltage? Could I place a
>> meter
>> across the contacts at the base of the unit
>
> Yes. With the flash turned on and fully charged, that will measure the
> trigger voltage.
>
>> and trigger it manually?
>
> Nope, no need to trigger it at all. You are measuring the voltage across
> the contacts or solid state device that trigger
> the flash by shorting that voltage out briefly.
>
> In early flashes, those contacts completed the circuit that dumped the
> flash capacitor voltage through the flash tube,
> so the voltage could be a few hundred volts. It was the switch that turned
> on a light, in effect.
>
> Later designs used semiconductor devices to act as the switch for the full
> flash voltage. That not only allowed
> relatively low voltages (and currents) across the camera sync contacts,
> but made possible auto flashes. An additional
> circuit used a photocell to determine when to turn the electronic switch
> off again.
>
>> It has a trigger button on the side of the flash. Or, does the meter
>> have to be in the actual camera-to-flash circuit when the camera triggers
>> the flash?
>
> Heavens no.
>
> Dr. No Flash
> --
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>
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