| Products > Test Equipment |
| FNIRSI 1013D tablet scope - display issue or normal behavior ? |
| (1/1) |
| pfm:
Just got a 1013D and have a couple of questions on what to expect from the display. The manual is of no help in this regard. - When the time scale is changed to 100ms/div or higher the bottom measurement panel (where it displays Vpp Vrms Freq etc...) disappears. It appears only from 50ms/div or lower. Is there anyway to lock it for high time scales as well ? - On very small signals (~10mv) when the vertical scale is changed between 100mv/div and 50mv/div there is no difference in the size of the waveform. But on slightly larger signals even like 100mv or more it works fine. Is this a defect ? Or is there some issue related to its minimum amplitude resolution ? What adds to the suspicion is that when it is switched between 100mv/div and 50mv/div I dont hear the relay click like I hear when switching between other ranges so surely its doing something different for 50mv/div. |
| Atlan:
1. switched between 100mv/div and 50mv/div This is a software issue, data from the 100mV range is multiplied by 2 2. When the time scale is changed to 100ms/div or higher the bottom measurement panel (where it displays Vpp Vrms Freq etc...) disappears. It appears only from 50ms/div or lower. Is there anyway to lock it for high time scales as well ? Property of the original firmware, it cannot be changed. https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/2150/ |
| pfm:
I want to correct/add one piece of information in my original post - I said the second issue happens only for small amplitude signals. That is not true. It happens for any amplitude signal. Basically at and above 100ms/div when you switch between 100mv/div and 50mv/div there no difference in the amplitude of the displayed waveform. I would expect the waveform to double or halve based on the selection but it just stays the same. I think this is a bug in the software/firmware. Is this issue fixed in the github firmware ? Question # 3 - what is the minimum signal this scope can detect ? Looks like it may be about 10mv ? Isn't that too high as compared to other entry level scopes ? I thought it would be around 2mv ? |
| Atlan:
Sensitivity is 100mV/div. 8bit ad converter. 800mV /256 is 3,1mV per bit. Interference is 1-2bit. Maybe 2x3,1 is 6mV and more. |
| pfm:
yeah by my measurement its like about Vrms 8-9mv. Below that it does not register a good stable wave or any voltage or frequency measurement value. This for signals under 40khz only as I was using a soundcard for a test signal. |
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