This pages are review of documentation of filter box production, tuning, control and mounting. Following text has copied from PDF file made Don Makoviecki:
Sept 9, 2001
PDF document contains a schematic, manufacturing drawings, assembly drawings and parts list. Also on page 10 are measured data for the three filters. Detailed graphs and a mechanical enclosure drawing will follow shortly. A second document, which contains the gerber files to manufacture the circuit board, is also attached.
The Heater and Temperature Monitor filters use an LC Balun filter while the Valve Contact Closure uses an RC filter on each line.
Seven turns (x2) of AWG 18 magnet wire are used for each Heater Filter coil winding. Seven turns (x4) of AWG 24 stranded wire are used for the Temperature Filter coil winding. And, seven turns (x5) of AWG 24 stranded wire are used for each Valve Closure filter coil winding.
Provisions for a 2.2 ufd capacitor in parallel with a .01ufd capacitor have also been provided for the Temperature Monitor filters. Our measurements indicate that the filtering at lower frequencies is more effective without this component and we recommend that it not be installed. The reason is that the low input impedance of the Balun filter reduces the effectiveness of the low frequency component isolation.
JMP1 is a jumper, which may be installed. The purpose of this jumper is to allow all of the common connections on the Valve Closure filter to use a single wire. This permits the use of commercially available 25-conductor cable for the Temperature Monitor and Valve Closure filters.
The two Heyco straight-thru fittings for flexible cable accept a minimum cable diameter of 5.8mm and a maximum diameter of 10 mm.
The cable connectors have not yet been defined, although, we have made recommendations in an earlier paper.
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| Last changed: Sep 14, 2001 | E.Kladiva, 2001. |