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Test Equipment / Re: Magnova oscilloscope
« Last post by Antonio90 on Today at 02:09:43 pm »Mi concern was more about partialy obstructing the screen view when crossing the probes over. But maybe it isn't a problem.
Recent Posts
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Test Equipment / Re: DMM Input Capacitance
« Last post by joeqsmith on Today at 02:09:22 pm »So you're injecting a MHz squarewave into the scope and then adding a bunch of stuff to the circuit (cables ...) and its having some effect. Depending on edge rates, I can certainly understand this. The fix may not be to find infinite impedance meters and reflectionless test leads.
Depending what you have for probes, maybe you could flip the setup so the squarewave attaches to the meter using what ever the required termination is, then use a scope probe that fits what ever loading requirements you have.
Depending what you have for probes, maybe you could flip the setup so the squarewave attaches to the meter using what ever the required termination is, then use a scope probe that fits what ever loading requirements you have.
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Microcontrollers / Re: Attiny1606 burning out when connected to a drv8251
« Last post by lavaman on Today at 02:05:22 pm »I tryed the first point aktĂ©ry, no effect. For the second point i tryed connecting a LED, didnt work. And powering the motor doesnt work either.
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Test Equipment / Re: Spectrum Analyzer - Rigol DSA815
« Last post by Holkly on Today at 02:04:28 pm »Can you obtain this information?You've got PM, Thanks !
*IDN?
:PRIVate:FACTory:SKEY?
If so, pm me and I may be able to help you.
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Metrology / Re: ADR1001 - Ovenized Voltage Reference System
« Last post by Noopy on Today at 02:03:20 pm »I had a change from 27.3.2024 to 29.5.2024... 
Edit: Notice came to me 10.4.2024
Edit: Notice came to me 10.4.2024
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Repair / Re: Rohde Schwarz CMU200
« Last post by ON4GN on Today at 02:03:03 pm »I checked both CMU voltages and the are the same.
The CMU-B68 are not interchanged !!!!
I gues that both CMU-B68 are irrearable, the reason for the bad caps will be probably too high voltage on some way generated into the CMU-B68.
This will demaged some other components on that PCB too, without a decent schematic it will be inpossible to find out wat is wrong.
But as I said before I can use the CMU200 without CMU-B68.
I tested the spectum analyser and RF generator and both are working.
But the " Internal RF Loop Selftest " is not OK : ERROR
I did connect RF2 ( as output ) to RF1 (as input)
Level Tx -10dB give me -25dB on the analyser screen. A loss from -15 db
??
I can solve this by putting RF 1 to +15.0dB but that is not the right way.
That is my next problem now
The CMU-B68 are not interchanged !!!!
I gues that both CMU-B68 are irrearable, the reason for the bad caps will be probably too high voltage on some way generated into the CMU-B68.
This will demaged some other components on that PCB too, without a decent schematic it will be inpossible to find out wat is wrong.
But as I said before I can use the CMU200 without CMU-B68.
I tested the spectum analyser and RF generator and both are working.
But the " Internal RF Loop Selftest " is not OK : ERROR
I did connect RF2 ( as output ) to RF1 (as input)
Level Tx -10dB give me -25dB on the analyser screen. A loss from -15 db
??I can solve this by putting RF 1 to +15.0dB but that is not the right way.
That is my next problem now
7
Microcontrollers / Re: STM32 interrupt priority
« Last post by pcprogrammer on Today at 02:02:19 pm »This manual?
http://file///home/peter/Downloads/pm0056-stm32f10xxx20xxx21xxxl1xxxx-cortexm3-programming-manual-stmicroelectronics.pdf
Whoops
Fixed it in the original post.
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Beginners / Re: audio amp study
« Last post by Herschel on Today at 02:01:32 pm »i have already adjusted the bias... for me, the problem was adjusting the 200k to center the voltage.
later the reason was found to be the stepup boost converter causing the problem. when i tweak the 200k pot to adjust the center voltage, for some reason, the voltage increases in the stepup converter but why?, anyway i replaced the boost converter, and it was working just fine
later the reason was found to be the stepup boost converter causing the problem. when i tweak the 200k pot to adjust the center voltage, for some reason, the voltage increases in the stepup converter but why?, anyway i replaced the boost converter, and it was working just fine
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Other Equipment & Products / Re: Pace ADS200 soldering station
« Last post by Shock on Today at 02:01:17 pm »I'm being sarcastic. There is a scaled up version of his coin test, where JBC is king of the large copper unscientifically controlled tests.
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Test Equipment / Re: Magnova oscilloscope
« Last post by joeqsmith on Today at 01:57:30 pm »Interesting idea to rotate the scope. Personally, having the connections all on one side, left or right, I can't see causing a problem outside burning up more width on the desk. My current scope has the USB and Ethernet ports on the side. The cooling fans are also on both sides. So this area isn't usable anyway.
I normally would be working right in front of the scope. One concern I would have is not paying attention and putting any tension on cables. Now we have a tight 90 degree bend rather than straight.
I normally would be working right in front of the scope. One concern I would have is not paying attention and putting any tension on cables. Now we have a tight 90 degree bend rather than straight.