Recent Posts

1

DIPtrace / Re: DipTrace 5.0 Beta

« Last post by MarkF on Today at 12:09:35 pm »

It's good to have someone from the team on the forum.

I do have a minor bug in version 4.3.0.5.
In the 3D view, the zoom value is not always correct.
If you zoom in and then 'Reset View', the zoom is not reset to 100%.
Also when you zoom in, exit the 3D view and reopen the 3D view, the zoom is not reset.

2

Test Equipment / Re: Siglent SDS3000X HD and upgraded SDS1000X HD

« Last post by ebastler on Today at 12:08:19 pm »

Even though Dave doesn't always go into as much detail as we'd like, the work he does is VERY time consuming and the equipment he has access to for reviews is not available to all of us.

And the style he has covers a wide range of users. From beginners to advanced anyone can find useful and very useful information.

Maybe I have not found the right EEVblog videos then -- I certainly don't claim to know them all. Would you have an example of an EEVblog T&M review which goes into enough detail to base a 5000€ purchase decision on it?

I don't like to order and then return the equipment. I prefer to have as much information as possible from the start.

And I wouldn't like to receive equipment already used as new.
If I don't like it, I'll sell it as second hand afterwards.

I mostly agree, and don't use that return option lightly. E.g. I have never ordered two or three products (in any price class) in parallel with the clear intent to keep only one and return the other(s). But with the DHO1074 which I ordered after quite a bit of online "research", I ended up returning it after finding too many glitches.

Seems fair to me for a mail-order purchase which you can't check out hands-on before buying. Also, I used my existing probes and mains cable for testing, not even unpacking the ones shipped with the scope, so the returned unit was "as new".

3

Beginners / Re: Strange noise/signal on scope

« Last post by radiolistener on Today at 12:07:57 pm »

However, If I remove the 10 Ohm resistor, the FFT signal looks completely different and the prominent 1 - 2 MHz signal is not observable any more.

There are two possible reasons for that (in practice you will have both of them in combination):
1) adding resistor affects noise power transferred from the source
2) adding resistor affects noise figure of RF frontend input

So, adding resistor affects both - your signal source and your oscilloscope input noise performance.

There is also third reason for the noise level change (which I think is dominant in your case) - adding resistor turns your installation into magnetic loop antenna which is very sensitive for near field magnetic interference. It's the same as adding short circuit, but adding resistor decrease Q factor of such magnetic loop antenna in comparison with short circuit and it makes it more wide bandwidth.

4

Test Equipment / Re: SDS800X HD Bug Reports + Firmware

« Last post by 2N3055 on Today at 12:04:30 pm »

Zoom function not working properly after loading mask:
Creating a mask and loading breaks the zoom function. See picture.

Also:
Creating a mask does not show the view that was set up for it.

I really would like that this feature "would" work with the zoom.

It does work.
You did not set it up properly.

5

Beginners / Re: Do I understand the terminology of voltage/current?

« Last post by tggzzz on Today at 12:04:00 pm »

This is also not entirely true:

By convention, current is said to flow from positive to negative.  So this is clockwise for this circuit.

Inside the battery, current flows from the negative terminal to the positive terminal.

While true, such thoughts can be confusing in the longer term.

It is simpler and more consistent to think (and formulate KCL equations) in terms of the current's direction in/out of a component's more positive terminal.

From that fundamental statement valid by definition for all components, it is possible to derive your statement about a particular component, i.e. a battery.

6

Other Equipment & Products / Re: Different bases on Amscope microscope

« Last post by Psi on Today at 12:01:32 pm »

A nice thing to do with the double boom arm stands, is get a flexible hose around 7cm diameter and attach it at the back rear of where the microscope head is.
Run the hose back to your fume extractor, which are often dual port anyway so you have a spare port.

It works great to have a fume extractor fixed mounted to the back of the microscope wherever you move it to

7

Projects, Designs, and Technical Stuff / Re: Arduino Stand Alone Programmer

« Last post by bingo600 on Today at 12:00:38 pm »

I have been looking to see if it's possible to program Arduino boards without the use of a computer. Just wondered if anyone has tried that or if it is just not feasible

Do you want to program via arduino bootloader (serial) , or Atmel ISP ?

8

Test Equipment / Re: Hacking the Rigol MSO5000 series oscilloscopes

« Last post by Kean on Today at 11:59:23 am »

@BTO - a few points

The thing about the python script method is that it requires additional IT knowledge of setting up a python environment and a network connection.  Not everyone with a scope has this knowledge, so it is great that you are offering the one-on-one assistance as this is where I think people will become unstuck for a process they will likely only ever do once.

I also have some hesitations with the direct FRAM data modification.  While DrMefistO may have reverse engineered the data format for the licensing, there is always the possibility of something being incorrect and causing weird problems or worst case even bricking the scope.  This is why I believe tv84 was suggesting trying to find a hidden SCPI command to do a similar thing.

Regarding Restore Defaults in the Pre Boot Menu, I believe this is a pretty important step when downgrading firmware as the stored settings are not necessarily backwards compatible and could cause weird behaviour.  In my case it even seemed to be the cause a lockup on reboot until I did this.  It may also be worth using this following an upgrade if there are some unexplained issues.

Regarding the Jitter and Eye Analysis, these are not supported options on the MSO5000 platform.  I believe they are supported on the DS/MSO7000 which shares a similar architecture and common firmware, but has extra processing power.  By all means the options can be enabled, but that doesn't mean they will be useful.  I recall there was some discussion of this in a much earlier part of the thread which you might find with some searches.

9

Other Equipment & Products / Re: Different bases on Amscope microscope

« Last post by Psi on Today at 11:57:59 am »

Yes articulating ones have serious vibration issues.
Which is obvious, you have a heavy weight at the end of a long arm with multiple joints.

Any time you bump them the microscope shakes for ages.

10

Projects, Designs, and Technical Stuff / Re: Connectors for Breadboard and PCB: GPS module EM-506

« Last post by xvr on Today at 11:54:19 am »

Looks like JST SH 6 pin series. Take a look for EM-506 sellers, they also often sell a cable with JST socket.

Example: https://www.sparkfun.com/products/9123