| Products > Test Equipment |
| Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see! |
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| smgvbest:
--- Quote from: luizhdinizf on November 12, 2015, 04:45:54 am ---anyone knows a way to comunicate this instrument with a c or python or another interface with a ubuntu 14.04 computer over usb? --- End quote --- Python https://pyvisa.readthedocs.org/en/stable/ Perl http://www.labmeasurement.de/ C and other languages sreach for NI-VISA that should get you goiing |
| robert_:
Finally got around to finish my HDG2k "improvement" project: Now with a safe PSU, isolation between output common and ground/USB and less loud, more effective cooling. If there is any sort of interest, i could be motivated to publish the psu design files (not that great, as it was built around components i had around) and some infos on the isolation mod. |
| lukier:
--- Quote from: robert_ on November 27, 2015, 11:25:08 pm ---Finally got around to finish my HDG2k "improvement" project: Now with a safe PSU, isolation between output common and ground/USB and less loud, more effective cooling. If there is any sort of interest, i could be motivated to publish the psu design files (not that great, as it was built around components i had around) and some infos on the isolation mod. --- End quote --- Nice job. Sure, let us know the details. Why this big toroidal transformer? Is that a linear supply for the analog part and the rest (black brick & misc) is a switcher for the digital? What kind of improvement did you get by using linear supply for the floating side? |
| robert_:
Why the transformer: I cant get bothered to design a 5-output SMPS for a one-off project. It takes umm, a little while to get things like transfromer design, EMC etc sorted. I wanted something that works properly on the first PCB revision... After all, i need floating +5V and +-18V for the output/analog side, and +5V (grounded) for the controller/usb side, plus 12V fan supply. Using a transfromer to supply +-18/+12V via linear reg, +5vf via a non-isolated switcher and the other +5V via an isolated dc/dc module is an easy way to get it done. Advantage: Standard PSU is unsafe POS (insuficient creepage distances within the transformer, if it breaks down instant line voltage at BNC connectors without tripping a fuse) that also happens to have 4.7nF between line and output common, which gives you nice ~ 115V AC at the BNC "ground" as the psu output is NOT grounded even though it really needs to be. Can deliver enough current to be felt and to destroy components. The output "ground" is floating somewhere but as there is no isolation between it and the USB connector, connecting it to the PC now gives you a nice ground loop to somewhere else. Better than the previous situation but still not good as it will inject all sorts of noise, plus relying on the USB cable shield as "safety" grounding isnt exactly good. Now i have a less dangerous PSU, safely grounded controller/USB side AND floating (but without significant leakage current!) output side to eliminate ground loops in my setup. |
| pascal_sweden:
The Hantek HDG2000B series already had a 16-bit D/A converter, which Siglent now recently started using in the new SDG2000X series. How does the Hantek HDG2000B series compare to the new Siglent SDG2000X series? Anybody out here who has both units in his lab, for taking up a practical comparison? The new Siglent SDG2000X series can handle a really low rise time. What is the lowest possible rise time on the Hantek HDG2000B series? |
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