14 Feb
2007
14 Feb
'07
9:02 p.m.
On 2/12/07, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On 2/11/07, Brent Hilpert <hilpert at cs.ubc.ca>
wrote:
OK... I've taken it apart to have a look... the IC dates are late 1968
- there are a few DIPs and a number of 8-pin epoxy-covered
button-shaped ICs all over the innards. The DPM came with a 36-pin
AMP connector with 4 wires loaded, two for power and two for input
voltage. The power wires go right into a transformer at the back of
the unit, leading me to suspect that it takes 110VAC, but perhaps it
takes 24VAC. I have not yet powered it up - does anyone have any idea
what it would take to fire it up?
The nixie tubes, for those who track such things, are 3 Burroughs
B-5750 7/8"(?) nixies, with a block next to them for "1", "+",
and "-"
(3 individual neons). The legend on the front proclaims it to be a
"mini-diget dpm".
I've never fiddled with a pre-LED DPM, so if anyone knows what voltage
it's expecting, I can fire it up to see if it works or is merely a
source of nixies.
Thanks,
-ethan
Ethan Dicks wrote:
Had a good day at the Mansfield Hamfest today. I
now have [a]...
nixie-tube panel DVM...
^^^^^^^^^^^^^^^^^^^^ If that is a Weston 1294-series DVM (4.5 digits,
TTL, fits standard 4"*1.75"
industrial instr. panel), I can supply the schematic.
It _is_ 4.5 digits... and does fit a standard panel opening, but
it's an MDPM-3 by Instrument Displays, Inc., of Haverhill, Massachusetts.