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| MHS-5200A function generator teardown / review / reverse engineering |
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| Wob_Bidlar:
Hey! Just a quick update on the MHS-5200-A: A month ago I bought one of these; today I received it and wanted to do these cool mods (thx devttys0 for your great work) but when I opened it I found out that they (the manufacturer) "modified" the Low-Pass filter for the DAC!! |O This is what it looks like (I didn't change anything!!): |
| gr8tfly:
--- Quote from: Wob_Bidlar on February 08, 2016, 11:37:58 pm ---Hey! Just a quick update on the MHS-5200-A: A month ago I bought one of these; today I received it and wanted to do these cool mods (thx devttys0 for your great work) but when I opened it I found out that they (the manufacturer) "modified" the Low-Pass filter for the DAC!! |O This is what it looks like (I didn't change anything!!): --- End quote --- I received mine about a week ago (25 MHz version) and the output looked pretty nice. So, knowing about the design tweaks and seeing your post, I cracked mine open to have a peek. Lo and behold, mine had been modded at the factory in almost an identical fashion. (There are three solder blobs across the components instead the long line yours has – see attached). On a side note: for fun, I fed the output back into the counter input. Perhaps unsurprisingly, they don't agree. At 11 MHz, my freshly calibrated receiver (< .1 ppm to 10 MHz WWV on an ICOM 756 Pro-III), showed 5200A output was about 50 Hz off, which isn't too bad. The counter was off a bit more, and in the opposite direction. Though obviously not built as a lab quality instrument, it would still be fun to at least "trim" it and see how it tracks over time. Just something else to fiddle with, which is what all this stuff is for, right? :) My question is whether anyone has any info on the "internal calibration" mentioned in their manual. I'm hoping there would be another set of commands for calibration, or at least some front panel key press voodoo to invoke it. |
| danadak:
I loaded this new version (link below), connected gen, and tried to do an arbitrary waveform. Loaded it on "Arbitrary" tab, then wrote to arb00 mem location. https://www.dropbox.com/s/cdlsuv2w5rkss6g/MHS-5200A_en5.0.rar?dl=0 It shows up on "Control Panel" tab when I select arb00 as wavefom, but does not output out of the generator. I need a drink........ Also sweep mode do. And no sweep trigger out of TTL outputs on gen to synch the display on scope to the sweep. Although I think one could use 2'ond channel to create the trigger as both channels operate off same time base. Regards, Dana. Modify message « Last Edit: May 01, 2016, 04:19:09 AM by danadak » |
| pascal_sweden:
Why not go for the FeelTech FY3224S? The DA convertor has a better resolution! https://www.eevblog.com/forum/testgear/feeltech-fy3224s-24mhz-2-channel-dds-aw-function-signal-generator/ |
| danadak:
I purchased the Ming He last fall. Still need to get this software to work - https://www.dropbox.com/s/cdlsuv2w5rkss6g/MHS-5200A_en5.0.rar?dl=0 Regards, Dana. |
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