Hantek DSO1060 or any alternatives?! - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th November 2012, 09:24 AM   #11
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
hi,

thanks for precaution, however DSO1060 has already been bought a couple of month ago. I'm pretty happy with it, moreover as it's my 1st scope it looks even too complex for me with huge amount of features

as being an owner of same device, could you please clarify pretty obvious question to me. I'm trying to measure +5VDC signal of Salas shunt built for my DAC (though it's a 1st scope, I'm pretty sure what i'm doing and know ho to take the measurements - done some trainings, youtube videos + some documentation :] ) So I have an issue, probably due to the interface I guess. If I set a DC coupling for 5VDC signal I measure I simply cannot "zoom" the noise I get, with Ac coupling it's all fine. Here are two attachments to make it easy to understand:

- the 1st one shows AC coupling on 5VDC signal, scope meter probe set to 10x and probe on the scope is also set to 10x as you can see. I guess it's not correct way of measuring DC signal, it just shows that I can set 100mV per division to see the oscillations.
- 2nd one shows DC coupling with the same signal. The problem here is that I cannot set less than 1V per division to see the oscillations. Actually I can do that and set it to 100mV as with AC coupling, but in this case signal line would be far above the screen of my scope even with trigger set to lowest position (-3.96V on the screen) I would not be able to see it. So my question is how can I “zoom” this DC signal to 100mV and see the oscillations?
Attached Images
File Type: jpg IMG_0104.jpg (383.1 KB, 116 views)
File Type: jpg 5VDC.jpg (833.1 KB, 118 views)
  Reply With Quote
Old 16th November 2012, 04:07 PM   #12
FredJM is offline FredJM  United Kingdom
diyAudio Member
 
Join Date: Jul 2011
Yeah -
This isnt a problem of the 'scope - You can only shift the trace so far before you go off screen if you have a large DC potential and want to look at the small AC superimposed on it.

Use both traces - connect the probes of CH1 and CH2 to the same point, set one to AC couple and one to DC couple, you can now set the AC coupled channel to whatever "zoom" factor you want, and set the DC channel to view the DC level.
  Reply With Quote
Old 19th November 2012, 09:47 PM   #13
diyAudio Member
 
Join Date: May 2010
Location: was Chicago IL, now Long Beach CA
You might look for end-of-lease returns from the companies that rent them to industry. Many labs don't buy anymore, they rent for the project term.

I've been shopping too, but not buying yet. I had to sell all my Heathkit bench stuff about 2 years ago to keep my house between software consulting contracts. The scope was never worth a darn anyway.

I've been asking for and getting advice. I started out looking at computer 'scope interfaces. Many people have advised me to consider the mid-size "hybrids". They have a USB port for things like more storage memory, bigger high-def display, remote control, automation, signal stats, FFT spectrum plots, etc., yet these hybrids have their own built-in display and can operate independently. The hand-helds tend to have too many "up-down" buttions but the hybrids still have knobs, which are much preferred for frequency and sensitivity (but buttons perhaps are sometimes more consistent with the computer remote virtual panel). The hybrids are not battery-powered and do require a power cord to a wall outlet, but I prefer that anyway. Yes, you want BNC inputs so you can take high-quality transformer probes. I wish I hadn't sold those... A computer interface with software which allows you to have multiple windows is nice, then you can have an uncluttered screen with the waveform and good cursor control for measurements, yet keep the stats on a seperate monitor.

What my friends call a "hybrid" scope has a full-size panel but is only 2 inches or less in depth.

Remember that the speed of the scope really says how accurate the picture is. If its digital, note the REAL native sampling frequency, not counting "interpolated points" for smoother display.

I'd sure like a built-in seignal generator, not just a calibration signal.

Last edited by cyclecamper; 19th November 2012 at 10:06 PM.
  Reply With Quote
Old 19th November 2012, 10:03 PM   #14
diyAudio Member
 
Join Date: May 2010
Location: was Chicago IL, now Long Beach CA
my. my...as I pressed enter the bottom of this page had an ad for AKTAKOM from tmatlantic.com

Plenty of "hybrid" scopes in every price range.
  Reply With Quote
Old 19th November 2012, 10:12 PM   #15
diyAudio Member
 
Join Date: May 2010
Location: was Chicago IL, now Long Beach CA
I see some with a VGA display interface. Kind of obsolete IMHO, why not an HDMI interface? Is the VGA more scalable because its analog (is it??) or something?
  Reply With Quote
Old 20th November 2012, 08:16 AM   #16
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
Quote:
Originally Posted by FredJM View Post
Yeah -
This isnt a problem of the 'scope - You can only shift the trace so far before you go off screen if you have a large DC potential and want to look at the small AC superimposed on it.

Use both traces - connect the probes of CH1 and CH2 to the same point, set one to AC couple and one to DC couple, you can now set the AC coupled channel to whatever "zoom" factor you want, and set the DC channel to view the DC level.
thanks mate!

will try that!
just to confirm, does it mean that 5VDC signal I'm measuring has too low noise to be captured by the Hantek? And is it the right approach to measure DC signal with AC coupling?
  Reply With Quote
Old 1st December 2012, 05:09 AM   #17
FredJM is offline FredJM  United Kingdom
diyAudio Member
 
Join Date: Jul 2011
"just to confirm, does it mean that 5VDC signal I'm measuring has too low noise to be captured by the Hantek? And is it the right approach to measure DC signal with AC coupling?"

Think about it! - Lets say you had 50mV of noise, and you want to see that.. You have a display with a vertical resolution of 8 bits, this means that each pixel distance corresponds to about 20mV ! So if you fit your 5V over the display (0V is a line at the bottom of the screen, 5V is a line at the top of the screen) you will see the noise as 2 pixels of variation, or 1/127th of the total display area!

And its not just digital 'scopes - its like trying to look at the roughness on the edge of a steel rule - you need a magnifier.. If your magnifier shows this roughness with an amplitude of say 5cm, you are going to need one hell of a big magnifier to be able to magnify the whole rule!

Which is why combining AC coupling probe with high "magnification" and viewing the the DC level with another probe set for low "magnification" is the only way to do it.. Well, its not the ONLY way to do it - if you have a precise noise free voltage source, and a noise free summer, you could cancel the DC voltages, take a reading of the "cancellation" voltage, and magnify the difference.....

But for practical purposes, think of AC coupling as a way you can magnify the AC component of any signal you are observing - If you need to see the DC level (or if you have a complex signal like DC at say 5V, with low frequency AC with amplitude of 1V, and mixed with this a High frequency at say 50mV) then use one channel to view the smallest signal using AC coupling and high gain, and the other channel with DC coupling to view the DC and higher level superimposed AC signal.

In most cases you dont really need to view DC and AC simultaneously - occasions where this is essential are rare (40 years as an EE and I doubt if I have had to do this more than 100 times)

But if you do need to do it, use both traces! LOL ;-)
  Reply With Quote
Old 1st December 2012, 05:27 AM   #18
FredJM is offline FredJM  United Kingdom
diyAudio Member
 
Join Date: Jul 2011
I fixed my Hantek 'scope..
Anyone who has a Hantek go dead or misbehave on them may find this useful:
HELP and finding experience about HANTEK DSO1060 - Page 1
I detail a "reset" procedure here, and the fault on my scope was a faulty watch crystal and/or poor soldering of this crystal - real easy to fix.
Hantek support is probably a good reason to think carefully before buying their equipment - but apart from that, they are reasonable - 8 bits is not enough resolution however for the FFT function to be useful for anything much - I believe there are 'scopes with 12 bit resolution for a little more money - I would certainly go for one of these next time.
  Reply With Quote
Old 1st December 2012, 06:23 AM   #19
FredJM is offline FredJM  United Kingdom
diyAudio Member
 
Join Date: Jul 2011
Quote:
Originally Posted by dtses View Post
thanks mate!
And is it the right approach to measure DC signal with AC coupling?
I dont feel I explained this well - Tried to edit my posting but was not able to..

Forget the concept of "DC" for a moment - There is NO SUCH THING as "pure" "DC".

Every point you probe on any circuit will always have some potential with respect to your ground probe (or "DC") and will always have some "unstable" or "changing" potentials, or "AC"...

If there was only stable steady DC potentials, we would never have invented the oscilloscope - it would have been pointless! Oscilloscopes are only useful for viewing changing voltages, or "AC"

What you want to do view the "DC" state and the "AC" noise can be done with a combination of a volt meter and AC coupled 'scope - The 'scopes role is to view the "AC" or changing voltages -

The usual aproach when debugging something like a voltage regulator, is to view the output with DC coupling to determine that the voltage is in the right ball-park, and that it is not drifting and that it doesnt have any visible nasties like ripple or drift.

Once this has been checked, and the voltage measured with a meter, and the regulator can be seen to be working with different loads etc, THEN one does not need to view the signal with DC coupling anymore..

One then moves to AC coupling so that one can observe smaller signals, and scale these to whatever magnification required - check for noise, check for instability, HF oscillations etc, under the various loading conditions required.

This is one of the normal way scopes are used - repeated every day by numerous EEs and technicians the world over .. Putting an AC coupled 'scope probe on a "DC" line to observe the AC signals on that line.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Feedback Wanted - Hantek USB Oscilloscopes LinuksGuru Solid State 0 17th September 2011 10:41 PM
alternatives to LF411 AndrewT Parts 22 21st August 2006 09:02 AM
LM386 alternatives? ainami Chip Amps 8 17th September 2004 04:20 PM
RCA alternatives? ftjandra Parts 12 28th June 2004 07:29 PM
Aleph alternatives plp Pass Labs 0 5th July 2001 05:50 AM


New To Site? Need Help?

All times are GMT. The time now is 03:02 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2