W
Winfield Hill
Guest
Our RIS-796 250-amp LED current pulser has
been operated up to 1100A by Rob Legg, and
is well suited to make shaped current pulses
up to 750 amps. E.g., "8.3ms single half
sine-wave" for "Peak forward surge current"
diode testing. Manufacturers like to make
rating plots for 1 to 100 cycles, etc. For
example, a SMD or SMC diode I'm considering
is rated at 350A for one cycle, dropping to
60A for 100 cycles. Fun stuff.
We've been using 6.3mm (250 Series) 0.25"
tab Faston connectors. These tabs are very
well suited to fat-wire crimped plugs and
cable "receptacles". They mount into 0.200-
inch 5.08mm-spaced holes on the PCB, and I've
been spacing adjacent tabs connectors 0.23
inches apart, to allow for easy handling of
the huge crimp plug housings.
Ideally diode testing would be done with the
candidate part properly mounted on a PCB, so
it has the right thermal mass, etc., but I
haven't found any PCB-mounting Faston plugs.
Moreover, it's clear that adjacent PCB-mounted
connectors need perfectly-accurate spacing,
or they won't mate. This means forget Faston,
and use 5.08mm PCB-mounting connectors. But,
bottom-line, most RIS-796 applications will
still need the Faston tabs mounted, but now
at 0.20-inch rather than 0.23-inch spacing.
Looking at "yellow" AWG 10-12 crimp terminals,
purchased at Home Depot, moving the Faston
tabs 30-mils closer to each other, would only
leave a roughly 10-mil plug-to-plug gap. So,
can you help convince me that's enough?
--
Thanks,
- Win
been operated up to 1100A by Rob Legg, and
is well suited to make shaped current pulses
up to 750 amps. E.g., "8.3ms single half
sine-wave" for "Peak forward surge current"
diode testing. Manufacturers like to make
rating plots for 1 to 100 cycles, etc. For
example, a SMD or SMC diode I'm considering
is rated at 350A for one cycle, dropping to
60A for 100 cycles. Fun stuff.
We've been using 6.3mm (250 Series) 0.25"
tab Faston connectors. These tabs are very
well suited to fat-wire crimped plugs and
cable "receptacles". They mount into 0.200-
inch 5.08mm-spaced holes on the PCB, and I've
been spacing adjacent tabs connectors 0.23
inches apart, to allow for easy handling of
the huge crimp plug housings.
Ideally diode testing would be done with the
candidate part properly mounted on a PCB, so
it has the right thermal mass, etc., but I
haven't found any PCB-mounting Faston plugs.
Moreover, it's clear that adjacent PCB-mounted
connectors need perfectly-accurate spacing,
or they won't mate. This means forget Faston,
and use 5.08mm PCB-mounting connectors. But,
bottom-line, most RIS-796 applications will
still need the Faston tabs mounted, but now
at 0.20-inch rather than 0.23-inch spacing.
Looking at "yellow" AWG 10-12 crimp terminals,
purchased at Home Depot, moving the Faston
tabs 30-mils closer to each other, would only
leave a roughly 10-mil plug-to-plug gap. So,
can you help convince me that's enough?
--
Thanks,
- Win