Recent Posts

1

Test Equipment / Re: REVIEW - Owon SDS7102 - A look at the SDS series from Owon

« Last post by lemon on Today at 02:52:38 AM »

There was a lot of compression with the conversion from bmp to jpeg. You have right the next images will be png.

I am thinking to change all the electrolytic capacitors (from what I have seen all of them are decoupling capacitors) with other with a low esr. The Owon used cheaper electrolytics capacitors here.

I'll come back with news...

2

Test Equipment / Re: GDS-2000A series New economic oscilloscope by GW Instek comes to market

« Last post by Teneyes on Today at 02:41:25 AM »

Another video made by GW Instek guys.

   I think the Instek Demo Guy is incorrect in commenting at the end about the overshoot and Under-Shoot, which I think are just Sin(x)/x interpolation effect like the one shown below.

3

Projects, Designs, and Technical Stuff / Re: Ultra Precision Reference LTZ1000

« Last post by alm on Today at 02:40:18 AM »

You can get the extra resolution from averaging anyhow, so if it's down in the noise, you might as well average the 6.5 digit value.

4

Projects, Designs, and Technical Stuff / Re: Ultra Precision Reference LTZ1000

« Last post by Dr. Frank on Today at 02:34:33 AM »

taking some readings from the babysitter volt abusing the 34401As gratuitous extra digits coming out of GPIB

Sorry for the off-topic (but in the spirit of volt-nuttery in this thread):
Does the 34401A put out more than 6.5 digits via GPIB?  I know the 3457A can do this, but had not heard the 34401A does the same.

Hello,

yes, definitely, 7 1/2 digits over the bus in each mode, if I remember right..
If you use the internal statistics, additional digits are also available.
I did not check recently, how stable the additional digit is, but have in mind that it's quite useful (for the LTZ1000 and on 4WOhm measurements), at least when additional averaging is applied.

Frank

5

Buy/Sell/Wanted / Re: FS: *REDUCED* HP 6038A 60V 10A Power Supply $75

« Last post by andyb on Today at 02:30:06 AM »

Shipping is gonna be a bit of a bear... even in the US48 I expect it to cost a bit more than the $40 I'm asking.

Still, it's a fun project, and a nice powersupply.

6

Beginners / Re: Constant current regulator?

« Last post by TerminalJack505 on Today at 02:28:20 AM »

You might try using a constant current sink type of circuit then.  Right now you are using a constant current source.

With a constant current sink you can use the booster's higher voltage to run the components rather than the potentially low input voltage.  It's hard to make a lot of ICs work at just 0.5V.  You'll have better luck finding components that work at 1.8V or whatever you are boosting the input voltage to.

7

Test Equipment / Re: Simple Technique to measure Waveform Update Rates: DSOs w/either Edge Triggering

« Last post by marmad on Today at 02:26:21 AM »

10M memory, there is 1Gsa/s.
Memory lenght is 10ms (and trigger position is half way)
After first trig, it takes minimum 15.2ms before it can trig agen.
Visible area is 15 div horizontally and capture lenght is now 10000 div (for oscilloscope and human blind time calculation)

I don't know, rf-loop. According to your table, the Owon is doing 80 wfrm/s with 10MPts @ 50ns/div. My DS2000 does 142 wfrm/s with 14MPts @ 50ns/div. Having used both DSOs, the Rigol feels more than just 75% faster - it feels a few times faster. I know this doesn't prove anything - and I could certainly be wrong - but I'm just wondering about those figures.

It would be good to get confirmation using a different technique to measure.

8

Test Equipment / Tektronix 465B - help needed!

« Last post by nomad86 on Today at 02:25:35 AM »

Hi,

First up, a disclaimer, I am an electronics beginner so please don't assume too much!

I have recently acquired a Tektronix 465B and HP 8011A pulse generator as a package deal. All seemed to be working well and I was playing around with the scope learning how it all worked. All the functions that a new, inexperienced in electronics, user would be expected to find seemed to be fine. Then I forgot to turn off the signal generator before I turned the scope back on while it was hooked up. What I observed is as follows:
1. The power light comes on
2. The lights behind the volts/div, indicating the selected setting, also came on for a short period before immediately going out
3. The screen then proceeded to light up slowly with a very diffuse glow on the right hand side of the screen

The fan -may- have also stopped although this could just be due to the auto start up sequence... although as this is analog I expect the fan is based of a thermistor of some sort? so as it had been running and was already warm it should have kept going?

Following this tragedy the last step is all that happens on a restart with no input. The focus does seem to have some effect (very minimal) and other lights come on when the corresponding buttons are pushed.

No magic smoke was seen/smelt escaping.

I have attached two images below showing the current state of the scope (you -may- be able to see that it is faintly glowing on the rhs of the screen) and the settings for the pulse generator when it all went south.





As I said before, I am a novice, although the reason I got hold of this scope is to learn electronics and this may be a good (or bad) way to dive into the deep end straight up. I am very willing to try fix it myself with a little advice from the gurus here.

Essentially I am asking very humbly if those of you with experience in these matters think that I have a chance of fixing this and if so how do I go about it?

9

Other Equipment & Products / Re: My new toy :) Agilent DSOX2002A - Sex on a stick!

« Last post by ben_r_ on Today at 02:23:39 AM »

The Agilent Oscilloscope Mobile works, but  when I have no Android device (tablet, smartphone or similar) this program is quite useless. No possibility to control my scope only with PC!!
http://www.home.agilent.com/agilent/software.jspx?ckey=2336125&lc=eng&cc=CZ&nid=-33575.970753&id=2336125

Oh see I was unclear on that! I couldnt tell if you would use it without having an Android device or not. Guess this was a waste of an install for me as well. Glad I got the VGA/LAN card. Im an iOS user anyway.

10

General Chat / Re: Supporters section?

« Last post by brabus on Today at 02:21:41 AM »

(...) on other fora. (...)

OT MODE ON

Finally someone treats Latin right! 

OT MODE OFF

I also quote madires; Dave can choose manually who to add to the "golden list", basing on nr. of posts, donations, forum behavior, etc.
Maybe some statistics can help him a bit, just to find out candidates.