RFI/EMI shielding of D-holders is accomplished by the use of a wire mesh captured within the lens cap that makes a contact through the conductive threads to the lampholders body and is subsequently grounded to the panel. This is done by plating the lampholder body with a conductive yellow chromate finish. A special lens bushing is used (and the knurled ring on the rear mounting holders) which has the internal threads also plated with the conductive yellow chromate and the external surfaces black or clear anodized. Viewed from the front of the panel, the external metal portions of the D-holders assembly have an anodized finish and at the same time a conductive path effectively grounding the mesh to the panel is maintained.

The D-holders ground to either or both sides of the panel and the contacts through the threads insures no loss of shielding even if the lens cap is partially unscrewed. Anti-rotational optional mounting is only available on front mounting holders- the flat on the threads provides a leakage path past the hardware on the rear-mounting holders. Details on test results of these assemblies, with attenuation in excess of 100 db, are shown in the Eldema RFI/EMI shielded indicator lite technical bulletin.

The lens caps are similar in appearance to the standard non-shielded types, however lens marking is not recommended since they do not rotate. The wire mesh is stainless steel.

The shielded single lamp holders are identical to the standard lamp holders in all respects except for the chromate plating per Mil-C-5541 instead of an anodized finish.

ORDERING INFORMATION

Formulate the part number using the table below.

EXAMPLE PART NUMBER
DHO – 10Y – D86BRT   Assembly
DHO – 10Y    Lampholder only
D86BRT    Lens cap only

PART MARKING
Part marking includes Eldema and the Lampholder number.

The front mounting holders are available in the “Y” finish only. Extra ring nuts for the rear mounting holders may be ordered as follows:

Z-141-10003-012 – Black anodize knurl gold chromate threads.

Z-141-10003-013 - Clear anodize knurl  gold chromate threads.

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