|
Back to Main
FAQ page
|
Q: What is a "floating shield"?
A: A floating shield is when the outside coaxial conductor can be at a potential other than ground. The outside coaxial conductor is separated from both the center conductor path and the mounting flange by ceramic material. |
|
Back To Top
|
Q: Can a BNC connector be used on an MHV feedthrough?
A: No. Caution should be exercised in electrical systems fitted with both BNC and MHV connections. BNC and MHV connections are almost identical in appearance and geometry and should never be cross-mated since their electrical ratings are not compatible. BNC connections are rated to 500VDC while MHV connections can handle voltages as high as 5000VDC. |
|
Back To Top
|
Q: Are electrical feedthroughs available with conductor materials other than copper?
A: Yes. These are available through Insulator Seal, a division of MDC Vacuum Products Corporation. The ISI division is staffed with sales, design and manufacturing engineers who can handle both standard material substitutions and custom solution inquiries. |
|
Back To Top
|
Q: What problems will be encountered in trying to shorten the pins on a standard multipin power feedthrough?
A: Any mechanical stress or shock to a ceramic to metal seal may compromise the integrity of the seal. The stress and shock caused by simply cutting the pins will almost certainly lead to failure of the seal. Any shortening of pins should be done at the factory.
The feedthroughs are fragile and cutting the
conductor is done at the customers risk. Altering the part will nullify the warranty |
|
Back To Top
|
Q: Is there a trick to putting a ceramic disc on a multipin feedthrough?
A: Yes. Separate lines of pins with rigid flat objects, like thin rulers, and place all pins from a single row into the ceramic at once. Extreme patience is required. |
|
Back To Top
|
Q: Can a general purpose liquid feedthrough be used for cryogenic applications?
A: No. The main complication is in making the temperature of the gasket material below its usable range. General purpose liquid feedthroughs have a weld joint exactly where the tube goes through the flange, which provides a very short thermal path to the sealing surface of the flange. Use a liquid feedthrough with a vacuum sleeve to increase the length of the thermal path and minimize the effect on the gasket seal. |
|
Back To Top
|
Q: Can we use this feedthroughs for a pressure
application?
A: Our product line is designed for High and Ultra High Vacuum (HV & UHV). While it is generally acknowledged that our parts work at pressures above atmospheric, we do not pressure test our products so, we cannot guarantee or warranty our products subjected to pressure applications. |
|
Back To Top
|
Q: Are Cryogenic feedthroughs also
non-magnetic?
A: No, They can be but some magnetic materials are commonly used in the construction of Cryogenic feedthroughs.
|
|
Back To Top
|
Q: What do you mean? “Overall assembly ratings must be adjusted to that of lowest rated component”?
A: A feedthrough rated for 30 amps might be down rated to 25 amps when used with a connector (it’s lowest rated component). |
|
Back To Top
|
|