Ian,
[The following was shared with me, without a caveat that
the information was proprietary]
>From Mike, one of the owners of Elliott Labs, a test lab in
Sunnyvale, CA:
Use a lot of billiard balls as the bearings. Put enough in
a "race" and they'll hold an automobile.
Use only white cue balls. The colored balls have metallic
in their paint.
- Robert -
Robert A. Macy, PE. . [email protected]
408 286 3985. . . . . . . fx 408 297 9121
AJM International Electronics Consultants
101 E San Fernando, Suite 402
San Jose, CA 95112
On Thu, 26 Aug 2004 10:03:18 +0100
"Gordon,Ian" <[email protected]> wrote:
> All
> I am considering making a turntable for EMC testing.
> However, the maximum load on the table would be up to
> 700kg evenly
> distributed. Thus the bearings in the device would need
> to be extremely
> strong and furthermore these would ideally be made of
> non-metallic material.
> The Radio Spares website, http://rswww.com shows a "Euro
> unit" (RS part
> number 887-843) which would be ideally suited as regards
> loading but it is
> made of steel and thus not ideal from an EMC view point.
> Does anyone know where I may find non-metallic units with
> similar loading
> performance?
> The other way of looking at this issue is by asking what
> effect the presence
> of 4 or perhaps 6 small (55x37mm) totally isolated
> metallic units built into
> a solid wood table approximately 1m diameter is likely to
> have on any
> measurements taken within a fully anechoic chamber with
> an EUT size of
> approximately 1x0.5x0.75m.
> The cost of purchasing a proprietary turntable would be
> prohibitive.
> Any opinions gratefully received.
>
> Ian Gordon
>
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