If you can read through the coil the same resistance in both directions
(checking for internal diodes), why not try reversing the DC polarity to the
coil? That should help with "stiction" or whatever the real term is. Also,
try operating the relays by hand to see if they stick from weak springs, the
"goo" of ages, or other contamination.
Pat, WA4TUK
> -----Original Message-----
> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> Behalf Of Scott Townley
> Sent: Sunday, May 28, 2000 7:41 PM
> To: amps@contesting.com
> Subject: [AMPS] Slow coaxial relays
>
>
>
> I recently acquired some coaxial relays very similar to the DK-60
> type (but
> there are no markings on them). They have 12VDC coils. I was
> surprised to
> find that although these relays "make" quickly (not measured but,
> you know,
> apparently right when coil voltage switched on) they "break" VERY slowly,
> at least 500msec after 0VDC and one of them literally 2+ sec after 0VDC.
>
> Not being a coaxial relay expert, is this how DC coils act? Do relay
> manufacturers have an option for slow break that I don't know about? Any
> suggestions on how to address the issue? I don't expect QSK operation but
> I think we'd all agree that 1/2 sec break is pretty darn slow.
>
> PS I have some marked DK-60 relays with 6VAC coils and they are
> "instantaneous".
>
> TIA,
> Scott Townley
> nx7u@arrl.net
>
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