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Old 9th August 2012, 10:46 AM   #261
NicMac is offline NicMac  Italy
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locky_z,

How do I load data without first having to run a measurement

The load data button only becomes active after doing a measurement. It is pretty annoying that I: 1) have to physically connect the tracer, 2) run the "get parameters" routine, 3) do a measurement, 4) delete the measurement, and only then can I 5) load a previous dataset........

The data file management is also not very transparent. It seems that all basic commands like "New", "Open", "Close" and "Save" have been replaced by only two that function as "Merge" and "Save as"

Cheers,

Nic


P.S. Thanks for the software update. It seems to have solved my data export problems.
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Old 9th August 2012, 03:15 PM   #262
locky_z is offline locky_z  China
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No need online ,The data can be loaded.
Direct select 'Curve Control' page, and press 'Load data'.
Click the image to open in full size.

The 'save data' only save the row that checkbox is 'checked',
The targte file will be clear first then write.
So if you want append data,you need load file first and save again.
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Old 10th August 2012, 08:29 AM   #263
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Quote:
Originally Posted by Bksabath View Post
I more than happy to help with tidy up of this but not good enough to start from scratch.

Your English is not to bad and if you get started we can get there...
I translated the document into english, not perfect though.
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Old 10th August 2012, 01:02 PM   #264
locky_z is offline locky_z  China
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Quote:
Originally Posted by PeterLeest View Post
I translated the document into english, not perfect though.
Thank you,
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Old 10th August 2012, 07:12 PM   #265
alazira is offline alazira  United States
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Quote:
Originally Posted by PeterLeest View Post
I translated the document into english, not perfect though.
Good going Peter . I had asked my wife (who is also from S'pore) to translate it but she said it was too technical.
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Old 12th August 2012, 07:33 AM   #266
locky_z is offline locky_z  China
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software update(2012.8.12)
And script Introduction doc (chinese)
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File Type: zip Curve tracer(2012.8.12).zip (866.9 KB, 105 views)
File Type: zip Script Introduction.zip (247.2 KB, 100 views)
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Old 12th August 2012, 06:33 PM   #267
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Quote:
Originally Posted by locky_z View Post
software update(2012.8.12)
And script Introduction doc (chinese)
Thanks for the new release . Is there are changelog available to see what has been done in the new versions? Regards, Chris
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Old 12th August 2012, 11:46 PM   #268
locky_z is offline locky_z  China
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I create a yahoo group,
CurveTracer : Locky_z's Curve Tracer
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Old 14th August 2012, 03:35 PM   #269
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Locky_z and others,

I do not intend to hijack this thread, it’s just that I would like to ask some information from those who have an original SMPS from HP. Also, the following information might be of use for anybody else building this tracer and purchasing a low-cost HP clone power supply.


I bought a low-cost new power supply from eBay Germany (~18 Euro), sold as a ‘replacement’ for the original HP. Of course, it had to be opened up, because:
  • That’s what I do with any electronic device since childhood…
  • I want to remove the primary IEC connector and install a loose chassis-mounted one with a power switch in the middle.
  • The outgoing secondary cable is in the way for putting this PSU inside an enclosure with the tracer PCB (like locky_z did himself in one of his pics).
Now, after opening up this low-cost PSU, it became clear it is low-cost indeed. There are a lot of missing components on the PCB; it makes me afraid that perhaps the protection circuit is omitted, and the output filtering seems commercially undressed in particular.

The capacitor brand isn’t the best either, and because I’m ordering parts from Digikey anyway this week, I’ll order some good quality caps with it.
  • The HV caps (Ltec, TY series) will be replaced by Nippon Chemi-Con KXG series
  • The LV output caps (black = Lelon LXK, blue is Ltec LZG) will be replaced by United Chem-Com KY series
    Of course I could just order exact replacements, but I have some hesitation; it looks like the lowest possible cost solution has been installed here… so if ordering anyway…. let’s get the right caps.
The two output filter/buffer capacitors in the picture are in fact in parallel, but of different make and value
  • The smaller black one is a Lelon LXK 330uF/50V, ESR = 0.059 Ohm @ 100 kHz, 1260 mA R.C.
  • The larger blue one is a Ltec LZG, 560uF/50V, ESR = 0.034 Ohm @ 100kHz, 1960 mA R.C
Please note that the PCB silk screen printing for the smaller blue cap shows a circle suggesting a larger size capacitor, and the larger black one has 7 mm additional headspace (so it could have been a higher CV cap).

In other words, it gives a (subjective) feeling of some cost cutting.

Question #1: do such caps always have to be of different value (for some reason as circuit resonance/oscillation)?

Question #2: what are the capacitor values in the original HP power supply packs?

Question#3: I could fit in 2x 680uF caps (2310 mA RC each), would there be any reason not to do so?

Then, some more bad feelings. A jumper is installed where a resistor (jumper across R59 under the black cap in the picture below) is printed on the PCB: this jumper is between the output capacitors and the choke (the final outgoing cables are connected to the other side of the choke). Checking out the web learns that there is indeed very often a resistor to further reduce any remaining ripple.

Question #4: is there a resistor installed in the original HP power supply packs, and what is it value? What would be the power rating?

Finally, the board is missing loads of components according the silk printing. One missing component is a small ceramic filter cap (SMD cap on the solder side) bypassing the two electrolytic capacitors above, before the choke.

Question #5: is there a bypass cap (SMD on the solder side) in the original HP power supply pack? Should I add one? Note: there is a ceramic SMD bypass cap between the pins of the departing cable.

Many thanks in advance to anybody who would have some answers.

Footnote: the zero volt output is connected to the earth pin of the IEC connector via the second thin PCB, and locky_z’s design isn’t having (or not so many) HF bypass caps either. Hence, any suggestion for improvements here? How ‘low-noise’ or ‘low-ripple’ has the PSU to be anyway?

cheers

DSC04901.jpg DSC04910.jpg DSC04919.jpg DSC04959.jpg DSC04963.jpg
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Old 14th August 2012, 07:08 PM   #270
NicMac is offline NicMac  Italy
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I think I got myself the same SMPS (NETZTEIL FÜR HP 0957-2247 32V - 2500mA) and it works quite well "out of the box".
I had absolutely no problems with it and it is really just fine if you can live with its voltage and current limitations. I would not worry about tweaking anything in it as you are likely to do more harm than good. Why polish a turd?
Spend your money on DUTs
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