@pcprogrammer
First, your work is highly appreciated.
But do the daily water level reports really help anyone?
And now something completely different
Last year's Ali black week I ordered a 1013D
Digital
Tablet
Oscilloscope for roundabout 119$ (~99e).
So far so good, it came in a black cardboard named "TABLE OSCILLOSCOPE". As a short test it could display all the stuff from my MHS5200A up to 25 MHz.
The name "FNIRSI" appears only on the boot screen.
But no FW version etc, no further info.
Due to a momentary lack of my USB scopes I must use it 2 weeks ago to analyze a problem with pulsed Mosfet arrays.
I read somewhere on the internet that its impossible to capture pulses.
I can state, its not easy.., but I did and stumbeled about a lot of glitches in the firmware... and my usecase passed away for its no D
SO
- The captured waveform is really poor, its only TWO!! screens.
On top there is a green marker, I can move the wave until this marker touches one side.
When visible, the values of the auto measurements are all ZERO(!).
When this marker isn't visible (maybe at longer time intervals, 20msec and longer, I didn't dig for) you cannot move the wave and cannot change the timebase but the measurement field have some values.. and sometimes(pulses) quite weird
When I capture a wave (stop the scope, NOT save the wave), save a pic, change the timebase to a shorter one and save the new pic the old measuring cursors are saved and on the screen itself the cursors are lost.
And sometimes the wave is lost..
When you like to view at the captured pics on the scope you have to choose them from an index, when I returned to the index afterwards for another pic the index is displayed a little mismatched.
Connected to a PC or similar host the storage appeares as a disc, captured pics show up as BMPs and all files are dated on March, 22, 2020, 23:48
- The scope is useless for low voltage signals.
I know, the lowest vertical voltage is 50vV/div, quite poor although same as on my DDS140.
But the DDS140 can display low voltage signals, noisy, but you can see something and can trace them.
When trying to monitor a low voltage signal with 1013-D I did see... nothing but a zero line. I checked with my MHS5200, On CH1 signals below 30mV aren't displayed any more!
In my case the trigger jumped in at 29mV, a stable signal needed more than 33mV!
Between 29mV and 33mV the screen showed a flashing signal over a zero line.
CH2 is even more crazy.
Flickering junk down to 20mV and up to ~50mV, unstable trigger up to 200mV.
Stable trigger only on signals above 200mV!!
Short vids attached
22mV-210mV.zip (2359.7 kB - downloaded 65 times.)
Bad firmware or concept due to high noisefloor?
Resume:
The 1013D maybe fine for juggling with logic levels without capturing and many audio purposes but it fails for low voltage (pre)amlifiers.
Its better than no scope but I cannot recommend it - only as an addendum.
Its not a DSO but a D
TO, just as stated.
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7:Storage depth: 240Kbit
Source??