The *breakdown potential gradient* or *dielectric strength* (units: MV/m)
is the electrical potential gradient at which an insulator breaks down and
a damaging surge of current like a lightning strike flows through it.  It
is measured by increasing, at a uniform rate, a 60 Hz alternating potential
applied across the faces of a disk of the material in the capacitor-like
configuration of Figure 1 until breakdown occurs, typically at a potential
gradient of between 1 and 100 MV/m.  The breakdown potential gradient is a
characteristic property of a dielectric (see *Dielectric constant
(permittivity)<http://inventor.grantadesign.com/en/notes/science/material/S14%20Dielectric%20properties.htm>
*).

Inge


On 25 June 2013 09:43, McGlaughlin, Jeffrey A <[log in to unmask]>wrote:

> Breakdown is measured per IPC-TM-650 2.5.6.3 and is the failure point of
> the dielectric material.  Dielectric strength per IPC-T-50 is the maximum
> working condition where breakdown does not occur over a specified time at
> conditions (temp/humidity/pressure.)
>
> Jeffrey McGlaughlin
>
> Engineering Designer
> Tactical Systems Aerospace
> Office (614)424-7582 Fax (614)458-7582
> Battelle 505 King Ave.  Columbus, OH 43201
>
>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael Strong
> Sent: Tuesday, June 25, 2013 12:25 PM
> To: [log in to unmask]
> Subject: [TN] Dielectric Breakdown vs Dielectric Strength
>
> I was reading through a specification sheet and noticed that both
> Dielectric
> breakdown and Dielectric strength were mentioned.  Both had the same units
> (V/mil) but the dielectric breakdown was considerably higher. My questions
> are what are the difference between the 2 and how do you measure Dielectric
> breakdown? Thanks
>
>
>
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