Recent Posts

1

Test Equipment / Re: SDS800X HD Bug Reports + Firmware

« Last post by eTobey on Today at 05:33:17 pm »

And again, smartass, antisocial, but so true to you signature on your account.

"Sometimes, after talking with a person, you want to pet a dog, wave at a monkey, and take off your hat to an elephant." (Maxim Gorki)

After talking to you I do marvel at how nice and intelligent monkeys are..

Your apology was obviously just a manipulation not to get blocked so you get to keep being obtuse troll.

You have to see the beauty of this signature, you can put yourself on which ever side you want.

You may want to read what i wrote about that teamwork we somehow uintentionally did together, and realize that we could get along quite nicely if... I just used your creative  example, in which i actually acknowledged, that i could have done better. As i was meaning before, it might help to forget what there was before. 

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3D printing / Re: could anyone please print me a microscope Head adaptor ring

« Last post by davebb on Today at 05:30:53 pm »

Good afternoon
That will be great, good that you are ok ,
Let me know what i owe you,
did you get to go out on your Bike,
Thanks Again,
Dave

3

Test Equipment / Re: New Siglent SPD4000X series power supply

« Last post by BillyO on Today at 05:29:12 pm »

Does anyone have an idea or the inside scope of as to when these will hit the North American market?

I'm guessing mid-summer, however you could put in a query to siglentna.com.

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Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by Mechatrommer on Today at 05:28:27 pm »

Not sure where the agitation comes from. Feel free to choose frequencies you consider more realistic. My point was just that aliasing remains aliasing, also in dot mode or with linear interpolation.

sorry sometime i got mixed up with 2n**55 posts, but i read his argument all too often. so its somewhat similar to your post... Sinc reconstruction CAN exaggerate aliasing more than Line plot, that was my point. we discussed Gibbs effect that will not be seen on Line plot, esp on fast rising edge square signal. but my reply still stands, if a user wants to probe fundamentals in violating of nyquist limit, then the user got problem, or he/she may not know enough, not the scope... ymmv. otoh talking about properly designed BW limited scope, it will not be able to see ill behaved oscillation in circuit, sometime aliasing can give enough suspicion something happened, ymmv.

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Repair / Re: Simpson 260 series 6 repair

« Last post by flashthunder on Today at 05:28:17 pm »

Hi guys...I am having an issue with calibrating a Simpson series 6. When I place 50ua across the movement the needle will deflect to @90 on the scale. I cannot seem to be able to get full deflection by adjusting the R2 trimmer pot. It takes @56ua to get the needle to deflect full screen. The movement seems to move freely with no binding. Were there different movements made between the different series...or should all the movement deflect with 50ua? Thanks

6

FPGA / Re: USB BLASTER (FTDI245 vs ch552x) Quartus “No Hardware”

« Last post by Mark on Today at 05:26:39 pm »

Try installing different versions of the stand-alone programmer.  I had problems with win 10 drivers and needed QuartusProgrammerSetup-23.1std.0.991-windows to make my clone blasters work. 

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Test Equipment / Re: SDS800X HD Bug Reports + Firmware

« Last post by eTobey on Today at 05:26:38 pm »

I don't know what you guys are talking about, but now I want cheesecake.

Get the ingredients, i bake one for us. But be warned, i have never done this  .

Another issue:
Level indicator is wrong in zoom modus. It is not right in the bottom window (find the arrow).

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Metrology / Re: Remote controlled DMM DCV INL tester based on voltage divider idea

« Last post by CurtisSeizert on Today at 05:24:12 pm »

The reversal error is calculated as (V(DAC,GND) - V(OS1) + V(GND,DAC) - V(OS2))/2 to give an equivalence between the magnitude of it and that of offset.

The 8 readings are taken together so that the inverse polarity datapoints are done as near in time to the normal polarity ones as possible. This should minimize the error contribution of various drift terms in calculating reversal error.

I should note for anyone looking at the spreadsheet that the headings for the reversal error columns correspond to the binary code of the individual SPDT SW positions. They are in the same order as the first three columns of readings.

The issue I noted with the reversal error for the center tap voltages is that they are about 7x higher on average than the reversal errors for the DAC voltage itself. The averages for the CT reversals are -4.16 and -3.99 uV while those for the DAC are -0.58 uV.  The center tap is buffered, so the output impedance should be the same. I cannot think of a way that this would be from the DUT, but I may be missing something. I am not worried about reversal error for the center tap voltage per se, but if it's indicative of an error with the source that is code dependent, that could lead to spurious conclusions about the higher order coefficients. The good news is that what I would consider the most likely code dependent effect - power dissipation of the nearby divider resistor leading to parasitic thermocouple voltages proportional to P(divider) would be second order. The shape of the CT reversal errors vs. DAC voltage looks very slightly parabolic, but you might have trouble proving that in a court of law.

As for the overall structure of the test, I am trying the option of averaging the results from multiple runs with the individual points taken at 10 NPLC rather than 100. This puts measurements of the individual components for calculating the error terms closer in time. We will see if it helps.

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Other Equipment & Products / Re: Faxitron Biovision/Bioptics Win7 (PCI resource issue)

« Last post by TopLoser on Today at 05:23:38 pm »

I'm stuck at getting the PCI -EISA bridge ( PLX chip on imager card) driver to work.
See attached in device manager - claims it can't find resources, but won't say what resources it's looking for. nothing shown on "resources" tab.
Device manager also showing "Bioptics PCI card", but not able to start, presumably due to the above issue.

Right.. I've just spent a pretty hit and miss day installing W7 on mine and then trawling the internet for drivers for all the devices that W7 doesn't know about out of the box.

A couple of things are troubling me at the moment...
1) I don't have a PCI-EISA bridge listed in device manager, even after installing the Bioptics card drivers
2) Bioptics card drivers install ok apart from an annoying "This device cannot start (code 10)

The Bioptics card is located on the "Intel Q77 Express Chipset LPC Controller - 1E47" so I guess my next move is to search for a DEV_1E47 driver and see if that brings my missing PCI-EISA bridge to the party?

10

Test Equipment / Re: New Siglent SPD4000X series power supply

« Last post by AddisonAve1938 on Today at 05:20:22 pm »

Does anyone have an idea or the inside scope of as to when these will hit the North American market?