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Miss Di
 Post subject: Deep head test
PostPosted: February 29th, 2016, 12:19 
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Joined: September 5th, 2014, 9:14
Posts: 72
Location: France
Hello,

In order to see if heads are OK, can I measure points on the HDD with multimeter/oscilloscope? Does someone do thsi type of test?
Suggestions to test heads?

Thanks,
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pclab
 Post subject: Re: Deep head test
PostPosted: February 29th, 2016, 17:15 
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Joined: July 12th, 2010, 4:38
Posts: 1420
Location: Portugal
What I know to test with a multimeter is to check for motor problems. Not heads. I find it hard to be possible to check.
Even the head test of the tools aren't 100% full proof...

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fzabkar
 Post subject: Re: Deep head test
PostPosted: February 29th, 2016, 17:56 
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Joined: September 8th, 2009, 18:21
Posts: 15528
Location: Australia
Some preamps have an ABHV / DBHV (Analogue / Digital Buffered Head Voltage) pin. I don't know whether current preamps have the same pin, but it appears that this pin senses the head voltage directly, before it is amplified. I could be wrong, though.

Preamp Block Diagrams:
http://www.hddoracle.com/viewtopic.php?f=59&t=229
http://www.hddoracle.com/download/file. ... &mode=view

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