Home › Coaxial › BNC Coaxial › Grounded, CF Feedthroughs

BNC, Grounded Shield Feedthroughs on CF Flanges

BNC Coaxial Interface

The 'Bayonet Neill-Concelman' connector, referred to as a BNC coaxial connection, is commonly used in conjunction with low noise 50-ohm instrumentation signal lines. BNC coaxial feedthroughs are constructed in both grounded and floating shield configurations. Floating shield types provide two concentric conductor paths: an outer metal conductor tube (shield) concentric with, and enclosing, a cylindrical center conductor pin. Both paths are electrically isolated from each other and a mounting flange. Grounded shield BNCs provide only one path that's electrically isolated from the flange, where grounded shield and flange are electrically common. Vacuum side of single-ended grounded and floating BNC feedthroughs have a 0.094 inch (2.4-mm) diameter conductor pin that mates with grounded or floating AccuFast™ connectors.

BNC and MHV ComparisonGlow Discharge Graph

Features

  • BNC Coaxial Interface
  • Grounded and Floating Shield
  • Single and Double Ended configurations
  • Kapton® insulated 50-Ohm cable
  • High temperature rated to 250°C
  • UHV compatible construction
  • Conflat® and ISO KF compatible mounts
  • Air service cables / connectors
  • Custom solutions on request
     

Specifications

Electrical 
Voltage 1, Maximum 
   Grounded Shield500 VDC
   Floating Shield2,500 VDC
   Current, Max @ 20°C3 A
Material 
Shell304 Ss
Pin / Conductor304 Ss
Insulation, CeramicAlumina
Connector, Vacuum 2 
   AccuFast™PEEK / Ss
   BNCPEEK / Brass
   SMAPEEK / Brass
   User-EndPEEK / BeCu
Connector, AirComposite
Cable InsulationKapton®
Vacuum Range 
UHV, Ultrahigh vacuum1x10E-10 Torr
HV, High vacuum1x10E-8 Torr
Temperature Range 
Feedthrough-200 to 250°C
Flange, Conflat®450°C
Flange, ISO150°C
Connector / Cable, Air165°C
Connector / Cable, UHV PEEK250°C
Thermal Gradient, Maximum25°C/minute
Notes 
  1. Electrical ratings are maximum test values, with feedthrough's vacuum side at ≤ 1x10E-4 Torr. Feedthroughs are intended for instrumentation applications carrying low level signal voltage and current.
  2. PEEK is a polyether ether ketone thermoplastic.
  3. Overall assembly ratings must be adjusted to that of its lowest rated component. For cryogenic service, the lowest recommended temperature is -200°C
  4. Connectors and cables are not included with feedthrough and must be purchased separately.