I’ve had my 1013D for a week –
Firstly, thankx to pcprogrammer for his fantastic work on the 1013D – it definitely needs a few improvments.
Anyway, here are my initial thoughts about the 1013D
The 1013D has MAJOR problems with calibration, with seemingly DUMB decisions made at FNIRSI
* Calibration is OK with a X1 probe and is just within 5%, HOWEVER, with a X10 probe, there’s a large 10% error - and it’s the same with both the FNIRSI probes and 350Mhz Tektronix probes. This is a major bug, apparently because FNIRSI didn’t know the input impedance of their own DSO – and it’s a bug that could be easily fixed in the software, by reducing the gain in X10 mode – however, as a quick KLUDGE, I soldered some 10M resistors across the BNC inputs & GND, which makes X10 accurate to 2% - pic attached.
* The calibration is apparently derived from an internal 3V reference (also used by the1KHz squarewave output) – when tested with an accurate 3.00V input – the 1013D always read this 5% high (as 3.15) – so having a way to adjust overall calibration/gain down 5% for X1 and 10% for X10 would make this DSO much more accurate, and for zero cost too, I have no idea why FNIRSI didn’t do this !!!
* a minor annoyance – my probes didn’t have a yellow color coding ring – a few minutes with one of my 3D printers fixed this. I also made some stickon probe clips – pics & stl files attached
* I also don’t like the stand much – It’s floppy and the angle is completely wrong for me – as a quick kludge I glued on a couple of wedges to make it a bit better, with an improved stand design as a priority item in my 3D design queue.
Good
The 1013D is, by far, the easiest, most user friendly CRO/DSO I have ever used, and I’ve run Electronics workshops at the Australian National Uni with top of the line equipment.
Bad
After some (admittedly quick) testing, it looks like FNIRSI added an extra 0 to the bandwidth – the 1013D seems good up to 10MHz, much beyond that and it’s not great, but as a DC-10MHz DSO it’s great value and fun to use too – it just needs that calibration adjustment added to be really great.
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Thankx
Geoff Cohen
https://www.thingiverse.com/geoff_cohen/designs https://diyodemag.com/education/exploring_3d_3d_printed_gears_part_1https://diyodemag.com/projects/paused_prints_arduino-based_filament_runout_sensorhttps://diyodemag.com/projects/fixing_firmware_updating_firmware_on_the_arduino_bootloader_part_2