Recent Posts

1

Test Equipment / Tektronix 2712 Spectrum Analyser nvram data lost

« Last post by jemoa on Today at 03:38:54 pm »

Hi,
I recently changed the back up battery to the gpib board and stupidly replaced battery on the display storage board. I have now lost the nvram data.
I need to do a flatness test which requires software which is unobtainable. Does anybody have access to this software. Many Thanks

2

KiCad / Re: "The routing start point violates DRC" error when routing differential pair

« Last post by Doctorandus_P on Today at 03:38:09 pm »

Yes, you can for example make a custom rule to modify or ignore parameters inside a rule area, or simply inside the courtyard of a footprint. But there are (minor) bugs in this area that interact with how the interactive router works. The final DRC check is reliable though

3

Test Equipment / Re: HDD image request. Teledyne LeCroy HDO6104R

« Last post by DaJMasta on Today at 03:37:51 pm »

Yes, this is a Windows-based oscilloscope, but it came with "windows embedded". I'm not sure if everything will start with windows 7 or any other. I would be very grateful if you could tell me where to download teledyne lecroy software. And whether it is in the public domain.

I've done the same on older LeCroy scopes, R&S analyzers, and more.  Bottom line: there is a regular PC on an industrial motherboard in there, so you can install regular Windows on it.  LeCroy makes their main platform software updates free to download from their website, and this platform software includes hardware drivers for their more recent scope models (though older models generally have an extra package available), so finding and getting it shouldn't be a problem, but if it is, it's likely because of sanctions imposed on your country for its role in the current political situation in the region.  If that is the case, you are likely barred from officially acquiring the software for the time being, and it would either take a third party circumventing these sanctions providing it to you (which could get them sanctioned), or if there was someone within the country that had downloaded it prior to the restrictions and was willing to share.

I don't think the A or R is significant in a meaningful way.  There is a chance the software pack differs, but the hardware is almost assuredly identical and the designation is probably for sale specifically in that region.

4

RF, Microwave, Ham Radio / Re: CB and Ham Radio Techs Love Their Bird Wattmeters

« Last post by pdenisowski on Today at 03:33:51 pm »

I thought it was pretty funny that R&S would use the Bird 43 as the first meter they show.

I'm glad you liked it - I spent a lot of time making those graphics.   I haven't finished that presentation yet, but here's are my draft notes on what the slide on "unidirectional wattmeters" needs to say. (see attached)

But I guess now I'll have to change "are" to "were"  :'(

Proving once again, it is the gold standard.

I included a slide on these because they are the "old" way of doing this, at least from a professional point of view.  The ham in me (KO4LZ) very much wants to collect instruments like this in my old age

5

Repair / Re: Agilent 34401A Bubble on PCB ... can it be saved ?

« Last post by The_Spectrum.A_idiot on Today at 03:30:51 pm »

CR202 Removed;
Measurements still the same :
00,1M range - 0.36μΑ
000,1Μ range - 0,36μΑ

next step ?

6

Metrology / Re: Solartron 7066 EPROM firmware wanted

« Last post by DVM-James on Today at 03:29:22 pm »

Hello again,
it would be interesting for some people to know more about the reference-numbers of that regarding resistors. Are they on the power supply board ? I think this are 0,25 or 0,4 watts resistors 10 % - so You can use metalfilm ones.
It would be also interesting to know a little bit more about the problems You have or had with Your 7066.

7

Projects, Designs, and Technical Stuff / Re: Tips for Durable >20 Pin Connector

« Last post by UncleMario on Today at 03:27:34 pm »

Hello vladrov, I am relatively new to the forum and only have about 4 years of electronic experience so take my advice with a grain of salt. 


I did find something I think is affordable for this purpose. I think minimum this will require 2 different connectors for the very high voltage and amperage line. Three may be best to help isolate the data and power lines. I have linked a 25 pin power connector, and another which is more a traditional D-Sub with screw pins rather then a snap in. Let me know if this gets you close! 

https://www.l-com.com/25-power-position-circular-connector-socket-housing-free-hanging-in-line-backshell-coupling-nut-px0820-s
https://www.amphenol-cs.com/product-series/d-sub-waterproof.html#

8

Test Equipment / Re: New Siglent SDM4000A series Multimeter

« Last post by tautech on Today at 03:26:16 pm »

Would be interesting to experience how well this new SDM4000 compares to our KS34465As and DMM6500, the SDM3065X we have is Ok but doesn't get used very often as we prefer the KS or DMM6500 for most use cases.

Nothing generally "wrong" with the SDM3065X but it's compared to the KS and DMM which have decades of refinement and in actual use this shows!!

I can say the UI is very different and will require some small learning curve for those used to the 3000 models.

SDM4000A has physical, touch/mouse and webserver control, although I didn't get a chance to have it connected to a PC.
I was mainly interested in UI usability using the touch or physical controls in turn and mixing them up a little.
It worked well and IMO just some minor tweaks were needed, mainly for better visibility/highlighting of user selections made.
The option to change the readout digit color was also suggested but not sure if that might be implemented or not, I hope it does.....

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Test Equipment / Re: HDD image request. Teledyne LeCroy HDO6104R

« Last post by squadchannel on Today at 03:23:54 pm »

When I re-installed my Wavepro 7k, the drivers came with the software. It just needed pointing Windows to the directory with the drivers to install them.

Then there is still hope; it is either the A or non-A model, so it might be possible if you get the update files for either.

10

Microcontrollers / Re: STM 32F4: any way to make it self program its FLASH from an external SPI FLASH?

« Last post by Siwastaja on Today at 03:19:46 pm »

... or just put a little bit of thinking how to protect the code parts that modify flash from things like Program Counter corruption/runaway or jumping to random function pointers. Just good old input validation on the function which does the write is 99.99% foolproof against those, you would need to accidentally jump at a very specific location with the accuracy of a few instructions, easy to do maliciously but very unlikely to happen by accident.