Author Topic: DSO measurement : Reference signal / Expert's eyes suggestion?  (Read 12192 times)

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Offline nvr0hkTopic starter

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #25 on: January 30, 2013, 01:11:24 pm »
oh dear, if there is something i really hate, then a on sunday produced device, by someone who never learned how to solder (at that point i alw<s hope it was at least a young good looking girl or boy).
As what I am seeing, I don't think this is the most harmfull, all the garbage of soldering (small soldering ball of around 0.2mm and metal scrap from holes in frame) and as I saw, the MB and Keyboard has not been washed (on the buzzer there is still the "HXD REMOVE SEAL AFTER WASHING" stick!!!) which is definitely the wrong point. I am starting to understand where is come from all of this noise.  :-DD

Then, what can I do to clean up the thin layer of grease on the PCBs? :phew:
 

Offline tinhead

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #26 on: January 30, 2013, 01:44:32 pm »
I am starting to understand where is come from all of this noise.  :-DD

noise is not coming from solder residue.

You should check the 2 power rails (white) sockets, they are in 99% of all "unknowwn" issues the source of problems - when
the current flow is not satisfiying the mainboard needs, linux or any app running on linux will fuck up.

When you wish to wash the pcb use IPA.

Did you already tested the UART solution?
I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.
 

Offline nvr0hkTopic starter

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #27 on: January 30, 2013, 02:18:02 pm »
When you wish to wash the pcb use IPA.
Thanks, but I don't have it at hand...
Did you already tested the UART solution?
no, I have already an USB2UART&BT module (based on SILABS (?) CP2102 from Dealextreme) but, until now, I don't fetch in your thread the scheme to find where to connect TXD/RXD and GND on the motherboard...  :P

I just cleaned the PCB keyboard but the result is not as clean as I expect.
 

Offline tinhead

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #28 on: January 30, 2013, 02:27:49 pm »
no, I have already an USB2UART&BT module (based on SILABS (?) CP2102 from Dealextreme) but, until now, I don't fetch in your thread the scheme to find where to connect TXD/RXD and GND on the motherboard...  :P

ehm, almost all you need is on the very first thread page, first and second post.

I've made the picture a bit bigger, you should see it immediately :P
« Last Edit: January 30, 2013, 02:31:32 pm by tinhead »
I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.
 

Offline nvr0hkTopic starter

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #29 on: January 30, 2013, 03:27:01 pm »
ehm, almost all you need is on the very first thread page, first and second post.
second post, here
I've made the picture a bit bigger, you should see it immediately :P
not exactly, I was reading this version.
Otherwise, I have found 3 male-male wires for soldering them on the PCB.
 

Offline nvr0hkTopic starter

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #30 on: January 31, 2013, 01:06:58 am »
rm /param/sav/run*
there is no /param/sav/run* file.
The rm /param/sav/run* will delete the DSO setting file, you will have to then to reboot DSO and check again if
now the firmware is rebooting itself after few seconds. If still the case, you can think about warranty case.
If try "AUTO SET", in console I get 'Killed' and after a couple of second the watchdog do 'The system is going down NOW!'
then if I do pkill dsod, and I run again ./dso.exe, the first time I got 'Killed', and below what's happened:
Code: [Select]
[root@Tekway-dso /]# ./dso.exe
sh: can't create /ker_rel_tmp_file: Cannot allocate memory
mmap start addr:0x40373000, phy addr :0x33d00000, mmap size: 0x5e000
Segmentation fault
 

Offline tinhead

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #31 on: January 31, 2013, 01:24:16 am »
looks bad ... anyway, let's try following

check with df -h how much space is available, not that we running out of space due what so ever.

Kill all dso.exe processes, kill all dsod.
Delete /dso.exe, all files in/OurLanguages/
Delete the /dsod (if exists) or /dso/app/dsod (if exists)
delete from /param/sav/ everything but not the chk1kb* file

Download this here

https://hotfile.com/dl/191684044/9ebada9/2.06.3_130114.0.ZIP.html

unzip the dso.exe to / of the DSO, then the OurLanguages/English.lan to /OurLanguages/ folder of the DSO.

chmod 777 /dso.exe

power off DSO, power it on again (to ensure that all reset vectors are properly initalized, a soft reboot is not good enough)

and hope the /dso.exe is running now

If not, rename it to /dso.back, power off DSO, power on again, logon to shell, rename /dso.back to /dso.exe
and run it as /dso.exe

Now you should see some messages, they could maybe give us the missing information we looking for.
I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.
 

Offline nvr0hkTopic starter

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #32 on: January 31, 2013, 09:51:53 am »
check with df -h how much space is available, not that we running out of space due what so ever.

It seems you are right:
Code: [Select]
[root@Tekway-dso /]# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                61.7M     61.7M         0 100% /
none                     30.0M         0     30.0M   0% /tmp
none                     30.0M         0     30.0M   0% /var
[root@Tekway-dso /]# mount
rootfs on / type rootfs (rw)
/dev/root on / type yaffs (rw)
none on /dev type devfs (rw)
none on /proc type proc (rw,nodiratime)
none on /tmp type tmpfs (rw)
none on /var type tmpfs (rw)
[root@Tekway-dso /]# ./dso.exe &
[root@Tekway-dso /]# uname: standard output: No space left on device
mmap start addr:0x40373000, phy addr :0x33d00000, mmap size: 0x5e000
I got "No space left on device" when I tried to insert my smartphone as an usb stick.
Then, I found why and what's happened:
Code: [Select]
[root@Tekway-dso /]# ls -al /mnt
total 24196
drwxr-xr-x    1 root     root           512 Dec 16  2011 .
drwxr-xr-x    1 root     root           512 May  9  2012 ..
drwxr-xr-x    1 root     root           512 Jan 24  2013 hantek3_1
drwxr-xr-x    1 root     root           512 Jan 24  2013 hantek3_2
drwxr-xr-x    1 root     root           512 Jan 24  2013 hantek3_3
drwxr-xr-x    1 root     root           512 Jan 29  2013 hantek3_4
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_1
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_10
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_11
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_2
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_3
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_4
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_5
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_6
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_7
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_8
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek4_9
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek5_1
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek5_2
drwxr-xr-x    1 root     root           512 Jan 25  2013 hantek5_3
drwxr-xr-x    1 root     root           512 Jan 28  2013 hantek7_1
drwxr-xr-x    1 root     root           512 Jan 29  2013 hantek7_2
drwxr-xr-x    1 root     root           512 Jan 29  2013 hantek9_1
-rw-r--r--    1 root     root       8200048 Jan 24  2013 hantekRecord30.rec
-rw-r--r--    1 root     root       8200048 Jan 24  2013 hantekRecord31.rec
-rw-r--r--    1 root     root        164048 Jan 24  2013 hantekRecord32.rec
-rw-r--r--    1 root     root       8200048 Jan 24  2013 hantekRecord40.rec
[root@Tekway-dso /]# du -sh /mnt
44.3M   /mnt
Now, I understand what's wrong, the mount operation failed when I tried to save all the screenshot with my smartphone, and the dso.exe continue blindly to save them under /mnt which, in this case, is /...  :palm:

More soon... >:D
 

Offline nvr0hkTopic starter

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Re: DSO measurement : Reference signal / Expert's eyes suggestion?
« Reply #33 on: January 31, 2013, 04:06:49 pm »
back to the basics of this subject, signal (this a measurement tool) with Reference signal injected in CH1 and a base transistor of a joule thief in CH2:





« Last Edit: January 31, 2013, 04:11:03 pm by nvr0hk »
 


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