Difference: Hantek6022BEScope (6 vs. 7)

Revision 72017-04-07 - uli

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The Hantek 6022BE Digital Storage Oscilloscope

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It has the additional advantage that the demo device, which simply generates a sine wave (with some noise added) and a triangular signal, can be used for all GUI testing such that the hardware is not needed for most of the work.

The original openhantek program on the other hand has all necessary GUI elements. I therefore decided to try combining both, using the libraries from the new program and the GUI from the old one. The screen dump above shows the demo device with the old GUI.

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Mapping the traces to the plots

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Uli Raich - 2017-01-24

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Vertical mapping

The grids of the openhantek scope are 8 units high (-4 - +4) and 10 units wide (-5 - +5). The scope trace must be mapped to these dimensions. Since the scope hardware has got an 8 bit ADC values 0..250 must be mapped to -4..+4. In addition we must take into account the hardware gain that can be set on the scope. The following table shows the available hardware gains on the first column, the gain settings in V/div in the second one, the max voltages that can be displayed in the plot and the last column shows the multiplication factor needed to map the values from the scope to the screen.

Gain Setting [V]	V/div	Total size on plot [V]	Multiplication Factor
1	10 mV	0.08	12.5
1	20 mV	0.16	6.25
1	50 mV	0.4	5
1	100 mV	0.8	1.25
1	200 mV	1.6	0.625
2	0.5 V	4	0.5
5	1 V	8	0.625
10	2 V	16	0.625
10	5 V	40	0.25

Example: Let’ say we have a 1 V signal we want to display. Then the scope HW gain will be set to 5V producing values of 128 corresponding to 0V to 128+32=160. In this case the maximum Voltage that can be displayed (without plying with the signal offset) is 4V corresponding to the scope voltage of 4V <> 205 (128 + (32*4)*0.625.

The vertical multiplication factor is multFactor = gain setting / total size on plot.
From the table we can see that for 5V/div only ¼ of the ADC resolution is reached while for 100mV/division and below the signal will be saturated.

Horizontal mapping

Horizontally we have to take into account

the timebase selected
the sampling rate
the record size needed to display the full trace

Timebase per division	Total horizontal size	Sampling rate	Record size	Down sampling
1s	10s	100 kHz	1 MS → 10 kS	100
500ms	5s	100 kHz	500 kS → 10 kS	50
200ms	2s	100 kHz	200 kS → 10 kS	20
100ms	1s	100 kHz	100 kS → 10 kS	10
50ms	500ms	100 kHz	50 kS → 10kS	5
20ms	200ms	100 kHz	20 kS	1
10ms	100ms	200 kHz	10 kS	1
5ms	50ms	200 kHz	10 kS	1
2ms	20ms	1 MHz	20 kS	1
1ms	10ms	1 MHz	10 kS	1
500us	5ms	1 MHz	5 kS	1
200us	2ms	1 MHz	2 kS	1
100us	1ms	1 MHz	1 kS	1
50us	500us	1 MHz	500 S	1
20us	200us	4 MHz	800 S	1
10us	100us	8 MHz	800 S	1
5us	50us	16 MHz	800	1
2us	20us	48 MHz	1016 (hardware max)	1

Uli Raich - 2017-01-24

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