Two issues of emc will hit you.
1) the trigger for the arc
This one is a pulse that is used to "fire" the arc. Usually, 20-30KV spikes
that hit once a second until an arc generation is detected.
The noise from these can be quite impressive, but at least they're not that
broadband.
2) the standard noise from the switching PS *and* from the arc itself. I've
seen several PS for arc lamps not comply at all. Maybe they did one day,
but they don't now. We're talking probably 20-30 dB out of Class A
compliance.
The noise from the arc unfortunately did not get a chance to characterize
that, but remember it is an avalanche type noise and is as husky as the
current that's supplying it.
- Robert -
-----Original Message-----
From: Donald Kimball <[email protected]>
To: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>
List-Post: [email protected]
Date: Friday, March 12, 1999 2:40 PM
Subject: Xenon Short Arc Lamp, Theatre Movie Projector, EMC Issues?
>I am working on a project where some digitial signal processing electronics
will reside inside of a digital movie projector for a large theatre. The
digital projector does not use film. The projector will contain a Xenon
Short Arc Lamp of up to 7kW. The ignition voltage for the lamp is 25-30kV.
>
>What are the significant EMC issues for such an environment? I am concerned
about emissions from the power supply (i.e. ballast) used for the lamp, and
susceptibility of the digital signal processor. I am trying to locate
information on both the expected transient voltage and current waveform
through the lamp, and the expected steady state voltage and current waveform
through the lamp.
>
>Don Kimball
>
>
>---------
>This message is coming from the emc-pstc discussion list.
>To cancel your subscription, send mail to [email protected]
>with the single line: "unsubscribe emc-pstc" (without the
>quotes). For help, send mail to [email protected],
>[email protected], [email protected], or
>[email protected] (the list administrators).
>
---------
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to [email protected]
with the single line: "unsubscribe emc-pstc" (without the
quotes). For help, send mail to [email protected],
[email protected], [email protected], or
[email protected] (the list administrators).
