TTL Flash shoe /Blitzschuh testen?

Ich habe möglicherweise den Blitzauslöser meiner Olympus C-5060WZ 
beschädigt. Und zwar mit einem alten Blitz, der an dieser Stelle ca. 60 
V geschaltet haben möchte ("high voltage synchro terminal").

Kamera:
http://www.wrotniak.net/photo/c/index.html

"Basically, any third-party flash having thyristor-controlled automation 
should work just fine with the C-5050Z. I would still recommend making 
sure that the synch voltage is below 8V or so (in spite of Olympus' 
assurance that the '5050 has a high-voltage protection). With these 
flashes, however, the camera would have to be set to manual exposure, 
and the flash intensity is then metered and adjusted by the flash unit 
itself."


Hier mal ein Zitat von S. 84 des Referenzhandbuchs

"
(1)Some flashes available on the market operate with a high voltage
    synchro terminal. If one of these is used, it may damage the camera,
    and/or the camera may not function normally. Contact the 
manufacturer
    of the flash you are using concerning the specifications of the 
flash’s
    synchro terminal.
(2) Some flashes available on the market have the polarity of the 
synchro
    terminal reversed. In this case, even if the flash is connected, it 
will
    not fire. Contact the manufacturer of the flash for more 
information.
"

Da habe ich vermutlich den 'Schalter' zerstört - wie kann ich das 
messen? Einfach mal eine LED mit 3 V und R dranhängen?