Radiometer Copenhagen BKF10 audio dist. analyzer

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Sorry for my english language in this Danish newsgroup.

I'm looking for documentation to repair a Radiometer Copenhagen
BKF10 automatic distortion analyzer for audio purposes.

The sine wave output is distorted, the meters are swapping
randomly.  This does not change after warmup.

Every documentation is welcome!  Looking forward to your reply's.

TIA,
Greetings from Netherlands,
--
Joop van der Velden
snipped-for-privacy@amsat.org



Re: Radiometer Copenhagen BKF10 audio dist. analyzer

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Hello

I think i can find the operation manual for it, but i am also looking for
the schematics(if i recall right, its the same model) i have one that is
confused in the measuring of the distortion after the smoke went out of it,
DO NOT Measure on a Class D amplifier with a bridge in the output....

Kasper



Re: Radiometer Copenhagen BKF10 audio dist. analyzer
On Tue, 01 Feb 2005 22:13:19 +0100, Joop van der Velden

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No problem.


I did repair some of these in a former life of mine. But docs?
No.

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How "distorted" - is it audible, visible on a scope, or using a
spectrum analayzer?

What is the level of distortion?
What happened when the error occured?

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I will try to help you out.

--
Jeg kan virkelig ikke se, hvad det skulle betyde, at forbinde en 0,1 mm X 1
mm tin-fyldt kobberbane i ét apparat med en anden 0,1 mm X 1 mm tinfyldt
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Re: Radiometer Copenhagen BKF10 audio dist. analyzer

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On the 2nd half of the negative side of the sine (4th quadrant) there
is a piece 'cut off'.  From the lower top of the sine a line of 45
degrees cuts away a piece of the sine.

The meters seem to react randomly, although the input frequency meter
reacts correctly.

Thanks for any help!

--
Joop van der Velden
snipped-for-privacy@amsat.org



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