Видео

Yep! It seemed to work at the time, but it is now 2 years later and starting to show the same problem again. If I could do it again (and I might), I would see if I couldn't replace the little conductive pads outright.

Not me! That's why I bother with broken secondhand equipment: if I repair it, my reward is a bench that punches far above my hobby budget ;)

@@jjoonathan7178 for sure!

@@jjoonathan7178 wow. I watched all the way through… you’re clearly not a hobbyist! That is pure experience and skill. Nice!

These are for lab instruments. The threat profile is 50lb plastic boxes and 200lb hairy apes. These cables are expensive -- that short cable may have cost $10k in its past life -- so lab supervisors (myself included) make much ado about how fragile they are and how much care they must be handled with. The connectors are the most fragile part, so this is still accurate to first order, but it is entertaining to see that in one direction at least the protection wildly exceeds expectations.

@@jjoonathan7178 well if thats the range of load you can expect then its probably an ok test. neat info.

Sorry, I do not have this analyzer anymore. The width of the 3.5" floppy drive slot is about 9cm, perhaps you could use that to estimate the screen dimensions?

@@jjoonathan7178 I'll try it, thanks

Hi! I went and uploaded my R3273 code here: github.com/jjoonathan/R3273-calibration . This should help with level correction, but I'm afraid I never figured out YIG correction due to the existing YIG calibration being quite satisfactory in contrast to the HP8565E in the video. I pointed out my best lead, though: there is a suspicious unknown "field5" in the cal data that might just hold the yig cal. Good luck!

@@jjoonathan7178There is a Service Menu for YTF Calibration. But without Adjustment Manual, I dont know exactly what to do there. Also, theres a routine buried deep inside the firmware, to save and read back all Factory Calibration Constants as .csv Files, to the SD-Card. But no one found out, how to trigger this yet...

@@jjoonathan7178 There is a Service Menu for YTF Calibration. But without the Adjustment Manual, I dont know exactly what to do in there. There is also a Routine buried deep inside the Firmware, that writes and reads back all Factory Calibration Constants as .csv files, to the SD-Card. But no one found out, how to trigger this yet...

Right, you need all 4 boxes but you can mix and match to meet your requirements. The screen and IF (box below the screen) stay roughly the same but you can choose 8340/8350/8360 as your source and 8514/8515/8516/8517 as your test set. Both the source and test set need to support the frequency you want to measure. If they don't match exactly that's ok, they just operate on frequencies they both support. There are lots of options in this family.

@@jjoonathan7178 thanks a lot

Both the music and XY are from the "YouScope" demo. It packs them on separate channels, which purists would probably call cheating, but YouScope's graphics are better than other staples like Oscillofun and that's why I went with it. If you want to find the music, just search YouScope on youtube, but if you want to try the setup yourself google for the original FLAC file.

The problem with using a power supply as a current source is the output capacitor. You can set a 1mA limit, but if the output capacitor is charged, it can discharge much more than 1mA without being limited. You might even see sparks with a 1mA "limit"! Instead, either use a quick custom circuit (voltage plus resistor, LDO regulator across a series resistor), an actual current source instrument, or a SMU.

Yeah, it made me a bit nervous, but I've always been able to find a job for the runt channel. There's usually at least one low-power, low-voltage job around. I suppose it's largely a function of what you're doing, and most of my projects at the moment are small modules rather than board bringup or power electronics. I've been eyeing the NGP-814, but it'll have to wait until I actually outgrow the GPP-4323, and that hasn't happened yet.

@@jjoonathan7178 I agree, I think I will have more smaller jobs for the 3rd or 4th channel than I think. Having a variable, lower current channel, offers more flexibility than a higher fixed current channel. That being said.....with the almost $150 increase of the 4323, I can get two 3303X-E's...for one 4323.....so there lies the dillema. I'd rather have only 1 psu right now, but it's a PSU...lol, always room for more power. My gut says go with 4 variable current outputs in one unit, than with 2 separate PSU's. Plus, the 4323 has standard BNC-banana plug width terminals.

Yep, still liking it!

Activating the scope filter took all of 5 seconds, while chasing the RF out of the cables would be a lot harder than just swapping the 6in banana leads for coax. 1cm of banana jack is more than enough for 2.4GHz to get in (and even substantial 100MHz), so I'd have to bring both the power supply and oscilloscope into a EMC chamber and I'd have to use an EMC-sanitized camera and so on. But why would we even want such a measurement? We are not going to be using the supply in an EMC chamber, we are going to be using it on a bench, where any banana-jack supply is going to be crawling with 2.4GHz and all other kinds of RF, just by virtue of having non-coaxial output. We should design the power networks of our circuits to handle RF hitchhiking on the DC inputs rather than try to produce RF-free inputs. Decoupling is much easier than generating and shipping RF-free DC.

Yep, it still works just as well as it did on the first day. No hum, no egregious fan revving, it just works. I'd still recommend it!

​@@jjoonathan7178 Thanks for your fast response. I`m waiting for reply to my message about returning the Owon power supply from eleshop customer service. As soon as i got the RMA Label and know the right procedure for changing to the another unit I really will take the GwInstek into closest consideration. It seems a good unit for the price of approx 605€ including LAN-option.

Sorry to hear that! No, I haven't seen that issue. Whenever I trip OCP (for example) it just turns off the green channel light and turning the channel back on resets the "fuse." Sounds like your unit has a problem. Time for warranty -- or a project. If it turns into a project please think about recording a video, I'd love to watch!

@@jjoonathan7178 Thank you for your reply I sent to the service waiting for a return.

I love colored heatshrink, but you need the right color/size and compatible substrate. It wouldn't work for buttons and panels and I wouldn't bet on tapering binding posts either -- but yeah, if you meet those requirements it's the best!

@@jjoonathan7178 Yep, certainly some applications are more difficult than others, so I'll keep an eye out for these style of pens. But if you need to resort to lacquer or epoxy coating anyway then I'm sure you can also get heatshrink to stay in place. And there is quite a wide range of heatshrink colours available cheaply these days (but possibly of lesser quality). Another solution if you have the tools is to 3D print, or CNC cut, some coloured plastic rings - e.g. to replace the lower part of the binding post.

Yeah, Real Engineers color their test clips by pumping them to high vacuum, expitaxially growing a layer of diamond, and patterning the geometry to achieve structural coloration.

I think there is a European version without binding posts because having possibly exposed metal at 32V does not comply with certain regulations.

@@jjoonathan7178 I have orderd it so I ll tell you soon. I hope for binding posts, I don't know about any regulation that would prohibit the usage of them.

@@thecuc007 Yes, unfortunately I can't be more specific because I am just passing on a rumor that I heard to explain a similar instance of one model having binding posts and a sister model lacking them. "Europe" isn't a specific country and "regulation" isn't a specific law, so I don't have much to go on one way or the other. I don't actually use spade lugs very often, but I slightly prefer binding posts and it sounds like you do too, so I hope that's what you get! Still a good supply either way.

You're right, my bad!

You mean like these www.banggood.com/BNC-Male-to-Dual-Binding-Posts-Banana-Connector-Plug-Test-Adapter-p-1166778.html?cur_warehouse=CN&rmmds=search

I made a video showing how: ruclips.net/video/RkpahjgQoiA/видео.html

Yeah, that sounds plausible. The reason for the "culture" comment was because of an earlier experience with a Rigol DS4014 where I learned that it had two blue channels (one teal, one saturated blue) for cultural reasons -- evidently in China (or some subset of the East) teal is considered conceptually distinct from saturated blue in the same way that we'd consider green conceptually distinct from blue. My previous GPD-3303S had channel 1 on the right and channel 2 on the left, so funky channel layouts are a trend with GW Instek, and I'm not entirely convinced that aux positioning entirely explains the overall trend, but I certainly don't know for sure. It's fun to speculate.

@@jjoonathan7178 Interesting. Didn't know about the teal thing.

About $564 + $30 LAN option from tequipment.net