DSO Quad engineering sample bug and firmware upgration

Products & Technology DSO Quad
#61

After upgrade (SYS1.34 AND APP2.32) I cannot calibrate due to “parameters version error”.

#62

I recognized that the scaling of the between 1V and 0.5V resolution is somehow strange. See the pictures attached. The square wave was generated using the internal function generator. I have the latest firmware uploaded.
ac.png
dc.png

#63

I am using DS203 and SYS ver 1.51, APP ver 2.52.
Signal 8 MHz:

FRQ: show it as 8 kHz (needed “MHz”)
CIR: 0.0124 us (really 1/8MHz = 0.124 us)

500 kHz showed as 500 Hz (from internal signal generator):

FRQ: show it as 500 Hz (needed “kHz”)
CIR: 2 us (it is correct)

FRQ:
Signals from 0 to 999 Hz it showed correctly, as Hz
Signals from 1 to 999 kHz it showed as Hz
Signals under 1 MHz it showed as kHz

#64

Hello, :slight_smile:

I don’t know if the error mentionned by Sergey82K has been fixed, but i have the same error on my DSO203. The frequency seems to be measured correctly but the measure (Hz or KHz or MHz) is not displayed correctly.

Hardware ver 2.60
Serial no 223D70DA
SYS ver 1.51
APP ver 2.52

Here are some screenshots :
10Hz -> 10.03Hz -> It seems to be correct.

100Hz -> 100.4Hz -> It seems to be correct.

1000Hz -> 1.007KC -> If KC means KHz, It seems to be correct.

10000Hz -> 10.03Hz -> It is wrong, it should be 10.03Khz or maybe 10.03KC.

100000Hz -> 104.7Hz -> It is wrong, it should be 104.7Khz or maybe 104.7KC.

500000Hz -> 546.7Hz -> It is wrong, it should be 546.7Khz or maybe 546.7KC.

1000000Hz -> 1.169KC -> It is wrong, it should be 1.169Mhz or maybe 1.169MC.

If you have a fix for this, please let me know.

Thanks,

#65

You can try this one: viewtopic.php?f=22&t=2957

#66

Hi,

Does the signal look that bad already at 1MHz? The author of this video say it fairly good to 5MHz:

youtube.com/watch?v=HKRLoELTP0A

Regards,
Dan

#67

Some peoples said’s that internal signal generator has bad signal form on more 1 MHz. If You use internal signal generator for tests wave form over 1 MHz may be You see bad signal from internal generator.
I do not have good external signal generator or oscilloscope for tests :frowning:

I tried to sample analog composite video signal from digital photo camera: youtu.be/I1EYZJEZD2A

#68

Thanks for the reply and video. So you think RemiD was using the internal signal generator in the above pictures?

Dan

#69

No, on screenshot above the internal signal generator tuned to 1 kHz.
May be on screenshot not square waveform, may be some digital signal.

My oscilloscope with internal generator tuned to 8MHz (square form):
2MHz:

OneWire:

Some other my screenshots here

#70

Thanks for the screen shots.

Dan

#71

pmos69>>Thanks for the link, :slight_smile:
I want to update the firmware of my DSO203, is there a tutorial to know how to proceed ?
Thanks

Dan13>>No the signal i have measured was from an external frequency generator.
However, this frequency generator may be of poor quality. I don’t know.

#72

Thanks for the reply, Remi.

#73

ESP and Hugeman,

Please can you tell me what the HW difference is between the engineering samples and the later ones? I would like to get the community open-source SYS and APP (and jpa’s Pawn!) to run on my engineering sample to the degree it is possible.

Regards,
Tormod