[TCML] China meters, completed control cabinet
Nick de Smith
tesla at desmith.net
Wed Mar 11 23:46:31 MST 2009
I use these in my control cabinet - they are hopelessly confused by RFI- I
found that by having a decent filter on my HV between the meters and the TC,
the problem largely went away. Note that these meters are not True RMS, and
therefore the current meter in particular will lie a lot.
They do lot cool though - here's a early photo -
> -----Original Message-----
> From: tesla-bounces at pupman.com
> [mailto:tesla-bounces at pupman.com] On Behalf Of Jim Mora
> Sent: 12 March 2009 01:26
> To: 'Tesla Coil Mailing List'
> Subject: [TCML] China meters, completed control cabinet
> Hi Group,
> Has anyone tried the China made panel meters? The illuminated
> blue background ones look sharp. I have set up three analog
> meters, 0-300Vac, 0-75Aac, and 0-15Aac. Thanks goes out to
> Bert Hickman for teaching me indirectly (like learning to
> fish) how to shunt a meter! Seems foreign calculating the
> resistance of #6awg and cutting it to 6" or so for a
> resistor; silver bearing solder changes the lug resistance!!
> I am wondering if the digitals would survive the EMI and HF
> transients that manage to make it back to the control cabinet
> (hopefully not much). I will have the analogs online as well.
> A cheap goose neck halogen desk lamp was disemboweled and
> mounted to the frame that is on a dimmer like a DJ setup to
> see the meters and controls. I am ready to move on to the HV
> cabinet now. Hurray!
> I'll post a couple of pictures on the web so the younger folk
> can see old school ;-) The schematics are similar to others
> with the usual contactor's latch, emergency stop mushroom,
> dead man switch, filters, and the addition of a PWM ASRG
> circuit. Current control is a sat reactor driven by a small
> rectified variac, Voltage control is via a Superior 1256D
> that is horizontally stackable-all in a 28" high 19" rolling
> rack mount caninet. Everything stays cool at > 60amps for
> several minutes into several turns of #10 wire. The sat
> reactor buzzes like crazy but stays ambient. It was scrounged
> out of a scientific oven with 5000 hours on it. I guess the
> windings are loosened and rattling. I'd love to submerge it
> in something. It has a silicon steel wound type of core.
> Anyone have ideas on that? Thanks Jack for the find!
> Looking for bigger sparks!
> Jim Mora
> Tesla mailing list
> Tesla at www.pupman.com http://www.pupman.com/mailman/listinfo/tesla
More information about the Tesla