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Old 22nd December 2007, 10:51 AM   #231
kepa1 is offline kepa1  France
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I'm afraid I can't source MBR10100G, can I use MBR745 instead? They are rated 7,5A/45V.

Thank you
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Old 23rd December 2007, 03:22 PM   #232
Ryssen is offline Ryssen  Sweden
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Merry X mas to all.
I tried the DEQ clock module with a 9v battery and conected the out put to my scope,the XO is from http://www.diykits.com.hk/OPA.htm


Click the image to open in full size.

Arent the curve supposed to be more Square?
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Old 23rd December 2007, 09:07 PM   #233
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You may have a high cap load on the circuit. What's your probe cap? Is it a x10 probe?

Jan Didden
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Old 23rd December 2007, 10:11 PM   #234
Ryssen is offline Ryssen  Sweden
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The first pic was x1,
this one is x10:

Click the image to open in full size.

Is it okay?
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Old 24th December 2007, 06:41 AM   #235
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Quote:
Originally posted by Ryssen
The first pic was x1,
this one is x10:

Click the image to open in full size.

Is it okay?

Well, if anything, it tells us there is a measurement issue. It isn't easy to reliably measure fast signals. For instance, how long is the earth wire of the probe? That's inductance> ringing > see scope pic...

Take a good piece of coax with a BNC on one end. Solder the other end directly to the point you want to measure, with the ground connection also close to that point. Let's see what you have then.

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Old 24th December 2007, 07:46 PM   #236
Ryssen is offline Ryssen  Sweden
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Quote:
It isn't easy to reliably measure fast signals.
No,it is not..

the probe is not connected,only coax.

Click the image to open in full size.

Click the image to open in full size.

Not very good on scope,but does it mean it will work good on DEQ?
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Old 25th December 2007, 08:45 AM   #237
AndrewT is offline AndrewT  Scotland
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what frequency are we measuring?
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Old 25th December 2007, 01:37 PM   #238
Ryssen is offline Ryssen  Sweden
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24.576Mhz
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Old 27th December 2007, 09:30 AM   #239
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Quote:
Originally posted by Ryssen

No,it is not..
You need the right tools to have a good measure. Look at the screenshots at the botton of this page. The first measure use a entry level scope (X10 probe), the second use a high end Lecroy scope with an high end probe....

http://www.awdiy.com/index.php?page=miniclock

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Old 27th December 2007, 02:27 PM   #240
Ryssen is offline Ryssen  Sweden
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Quote:
the second use a high end Lecroy scope with an high end probe....
Well I learned sommething new today too..
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