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Micsig Tablet Oscilloscope tBook mini TO1104 review (100Mhz 4 channel 'scope)

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nctnico:
The image already shows different trigger level and decode threshold (the 2 yellow symbols at the right side of the screen). My guess would be that the decoding is an entirely different path besides the acquisition and trigger system.

GeorgeOfTheJungle:

--- Quote from: nctnico on April 29, 2017, 10:50:38 am ---The samplerate is 400ks/s and yet it can decode a 500kbit/s CAN stream (judging from the correct message checksum).  :wtf: It is almost as if the decoding is a seperate system using a higher samplerate. Once the decoding is released officially I definitely want to dig deeper into it.

--- End quote ---

Siglent could learn a thing or two from that...

thanasisk:

--- Quote from: nctnico on April 28, 2017, 05:37:17 pm ---Input filtering
The tBook mini also support input filtering. IMHO input filtering is more useful than high-res mode because the filter cut-off frequency is fixed and the filter can be set to almost any frequency. Also high-high pass filtering can be used. The filter can be set from 30kHz and higher. Unlike my GW Instek GDS-2204E the TO1104 doesn't slow down when filtering with deep memory. I guess the filtering is done inside the FPGA instead of the SoC. I did a test to confirm this and used a frequency sweep to show a long trace combined with input filtering. The long traces makes it impossible to do the filtering on the display data so this test should provide an answer. The trace shows correctly so the input filtering is done inside the FPGA and is not a post-processing function.

--- End quote ---

Thank you for the thorough review!
Is the input low pass filtering an adequate replacement for high-res/boxcar averaging? Is increased bit resolution visible on the screen?
Theoretically boxcar averaging is a low pass filter with very steep rolloff which i guess has much steeper characteristics than micsigs input LPF implementation...

Could you perhaps show us the effect of the input low pass filtering on the micsig when presented with  a 1khz sine plus wideband awgn from a dds generator with say 30 khz lpf cuttoff?

R_G_B_:
One feature missing is a zero function Example when trying to zero out offset errors on current clamps   or sensors attached to the oscilloscope. They have this function on multi meters and some fluke scope meters. I don't know why this functions not implemented as standard on all oscilloscopes.

R_G_B
 

nctnico:
Every oscilloscope has a vertical offset control so there you go. Also I've never seen a DC current clamp without offset nulling.

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