Planar Speaker Asylum

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RE: Measure Quad 989 trigger level?

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In Reply to: RE: Measure Quad 989 trigger level? posted by kentaja on January 28, 2015 at 06:07:44

I was under the impression that this system was a purely electrical system, i.e. it measured the voltage over time and decided when the trigger. If it is measuring sparking I can better understand why it differ between the two speakers playing the roughly same signal.

At any rate, if really I wanted to check the trigger level, would 100/900ms 100Hz be a good signal, do you think?

Per.

Follow Ups:

RE: Measure Quad 989 trigger level? - kentaja 07:24:54 01/28/15 (3)
The sniffer circuit is not interested in drive level. It is sensing any spark that might occur inside the speakers.

The soft clipping amp that was employed in the ESL-63 is looking for drive level.

The zener clamp circuit will be drive level dependent.

You can measure as your propose but that will tell you nothing about the operating condition of the sniffer circuit or why the speakers are shutting down at lower than ideal levels.
- RE: Measure Quad 989 trigger level? - PerStromgren 09:09:15 02/04/15 (2)
  I have measured my speakers now. I hooked up the scope to the terminals and fed the speakers with a 100 Hz sine 100ms on 900 ms off signal. The right speaker shuts down with a "crack" at about 25Vtop, but the left just distorts the signal on the scope at some 40Vtop, without shutting down. I suspect a faulty panel.
  Both speakers sound just fine, driven under the 25V limit. I am in contact with Jlindberg, forum inmate, who I hope can take care of my faulty speaker.
  Per.
  
  Edits: 02/04/15
  - RE: Measure Quad 989 trigger level? - Roger Gustavsson 12:29:16 03/18/15 (1)
    Per,
    any progress in finding out what is wrong?
    - RE: Measure Quad 989 trigger level? - PerStromgren 04:33:33 03/19/15 (0)
      A panel is faulty, and the service people in Uppsala will have a look at it. Problem is that Uppsala is a 4-hour drive and the speaker has to be there overnight. I have to plan the trip, but it will probably happen in a few weeks time.
      
      Per.

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