Small details that skipped my keyboard:
In using digital voltmeters the placement of the probes is simple, as
the display will present results with a - sign if you invert positive
and negative probes on dc voltages. Needle voltmeters will try do swing
to the wrong side of the display - reversing the probes will get a
proper reading.
I suggested the ~200v AC setting simply because I live in a 220v area -
but any AC coming from the flash unit will do its best to flow towards
the ground, using you and your camera as possible, so I don't consider a
safe AC reading coming from the sync line.
DC or CC - constant current may be dangerous too - pls take care.
lf
Luiz Felipe escreveu:
Well, I use a voltmeter capable of good information on the desired volt
range. In these days of almost disposable multiple reading digital
meters, every single model I know offers a 0~20 volt setting for DC
current. Hold one of the meter's probes to the ground part of the flash
shoe, the other to the center contact, and watch the reading as you
cycle the flash some times, from power-up to the discharge and then the
re-charge. Safe readings are up to 6v DC, 0v AC - but handheld units
usually present no AC issues, AFAIK. I assume a 7v flash as safe - my
285HV goes past 6,7v but is being used with Canon, Sony, Nikon and
Pentax digital cameras with no problems so far.
On studio units you should read from both parts of the sync cord - but
first look for AC leaks, with the meter set to ~200v AC, one probe to
the sync, one wire at a time, other to a ground line or large metal
structure. Any signals read here spell problem to modern cameras. Old
studio units were known to zap photographers with damp, sweaty faces...
pls note that AC is dangerous, and if not sure of the procedure call for
help.
lf
Pasvorn Boonmark escreveu:
Luiz,
Thank for the information.
In general, how do you check voltage trigger for a flash?
-Pasvorn
On Sat, Sep 19, 2009 at 7:01 AM, Luiz Felipe
<luiz.fel...@techmit.com.br> wrote:
Miserere, Pasvorn, I heard about an older version of the 285 that
would be
dangerous.
I have one (2001 bought) that is just about 7 volts on the trigger,
currently swapped for a FTZ 330.
Ed, since you already paired your 285 with the K100d, I'd assume your is
safe. But checking is always a good move, IMHO. I do test every new
flash
before I use it, and that goes for friend's studio flashes - seen older
models leak AC into the sync, and trigger voltages up to 600v, in
particular
ancient units.
lf
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and
follow the directions.
--
Luiz Felipe
luiz.felipe at techmit.com.br
http://techmit.com.br/luizfelipe/
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
