Recent Posts

1

Test Equipment / Re: SDS800X HD - Issue disscusions - is it me, or the scope?

« Last post by ebastler on Today at 11:30:59 am »

when triying to use the mask feature on the zoom window, i then was not able to get the zoom window back to the state where it was before setting up the mask (see picture).

But what problem does the picture show?? 

The arrow in the picture points to the trigger threshold, which you were apparently setting at the time of taking the screenshot. That seems like normal behaviour? And what does the name of the picture ("would help to see channel") refer to? I see waveforms for CH1 and CH3, and I see the details in the respective info boxes -- so what is missing?

When posting such findings, please do take a step back before you click "Post", and review whether the description is sufficient for a reader who has not been sitting in front of your scope with you.

2

Metrology / Re: Digitec United Systems Corporation 262B Multimeter Repair

« Last post by IconicPCB on Today at 11:29:16 am »

A possible culprit one of the old style carbon composition resistors. They tend to go high impedance.
Just check their resistance value.
You may be lucky.

3

Open Source Hardware / ESP32 Ethernet, Wi-Fi & Serial Gateway

« Last post by selcuk on Today at 11:26:20 am »

Hello EEVBlog People,

I want to share a recent project of mine with you. This is a design based on ESP32 chip. It is compatible with open source esp-at project. One can easily develop a custom firmware on it as well. Schematics, layout, PCB antenna design and simulations, pin out diagram, part list and much more are available on the link below:

https://github.com/uysan/iot-esp-eth

It is an "Open Source Hardware" developed with "Open Source Software". The software list includes but not limited to KiCAD, OpenEMS and Octave.

The board has ESP32-D0WD-V3 MCU, 16 MB serial flash memory (W25Q128JVSIQ), 10/100 Mbit Ethernet (RTL8201F), 2.4GHz PCB antenna, USB-Serial programming, monitoring and general purpose interface (CH340G), 5V to 3.3V voltage regulator (1117 series), 2.93V supply voltage supervisor (APX811-29UG), protection components and RF shield.

Kind Regards,
Selçuk

4

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

« Last post by Gerelectronic on Today at 11:24:17 am »

Hi everyone.
I'm trying to create a project with an EM-506 GPS Module.
The problem is that I can't understand what types of connector I should use to test the GPS module (which already has a cable with a female connector) on:
.- Breadboard,
- And subsequently also on PCB;

Sorry if it's a trivial question, but even searching on the internet I'm not sure which connectors are suitable.
I also tried to consult the datasheet, but unfortunately I can't find the information I need.

Additionally, where do you recommend I buy them?

I'll add two photos so maybe you can understand better.
Thanks a lot to everyone.

5

Repair / Re: JBC SL-2300

« Last post by lionelkjh on Today at 11:24:04 am »

Good morning; I also specify that the voltage measured on the iron is of the order of 160v which causes the resistance to glow quite quickly; I unplug it immediately! The voltage should be close to 24v; we therefore have a tension 5 times greater....Cdt

6

General Technical Chat / Re: Russia and China to Build a Nuclear Plant on the Moon.

« Last post by tggzzz on Today at 11:23:04 am »

The moon doesn't rotate, so no night or day.

Of course the moon rotates. Once a month.

The dark side of the moon is a music album, not any description of reality.

The moon did have a "dark side", but stopped having one on October 7th 1959.

Hint: Africa used to be called "The Dark Contininent", and it wasn't because of the melatonin in the inhabitants' skin

7

Test Equipment / Re: SDS800X HD - Issue disscusions - is it me, or the scope?

« Last post by eTobey on Today at 11:17:56 am »

Some new issue:
While the issue with the mask loading, that changes the settings of channels, is not a big problem (easy to undo - but still annoying), when triying to use the mask feature on the zoom window, i then was not able to get the zoom window back to the state where it was before setting up the mask (see picture). Also setting up the mask is very hard, since the zoomed view of the waveform dissappears then.

Its really nice to have many nice features, but i would have rather have "a few" features, that work flawless.

8

Test Equipment / Re: Multimeter selection for production testing

« Last post by tszaboo on Today at 11:17:07 am »

My baseline is now the Siglent SDM3045X which I think would fulfill the role.

Have you considered the SC models for their 16 channels of acquisition ?
They start from SDM3055-SC so a bit dearer than the SDM3045X but all can do dual measurements, regardless of the model.

Unfortunately they need be a -SC model from the factory as the scanner card cannot be retrofitted.

I didn't. While I can see how this could be useful to do the test setup in the first place, for this setup, only current measurement is needed. And this thing will be dedicated for the production line for a few years, so minimum product...
I think if I design a new test jig, than that scanner card can be very useful to measure more things.

I'm setting up a production line testing tool. It an in-circuit functional testing JIG, that measures a bunch of things, and makes sure that the board we ship is within specifications. There is one test that's still missing, measuring the current consumption of the DUT. The original design called for a Keysight 34465A for this. And well, it's not within the budget to buy a new one.
So I'm searching for an instrument that can do current measurements, connect to the test system with Ethernet (USB might be acceptable). I though to ask the collective brainpower of the EEVBlog forum, because you know more instruments than I do. So here are specs:
- Desktop multimeter
- Measures ~100uA with 10uA accuracy
- Measures ~2A with 1% accuracy
- Can switch between these ranges without disconnecting the DUT
- Has Ethernet and SCPI, maybe USB
- Doesn't look like a toy
- Not an absolute nightmare of software to automate

My baseline is now the Siglent SDM3045X which I think would fulfill the role. I'm basing this on no actual evidence, just a guess, having never used Siglent multimeters. Honorable mention are all the Owon multimeters that look like a toy, and the Hantek 365* that looks like the piece but doesn't have uA range. And the Keysight U2741A that's somehow even more expensive than their 6.5 digit desktop meters.

I have a question about this:

"- Can switch between these ranges without disconnecting the DUT"

Does that mean :

- I don't want to change cables from LO/HIGH range inputs on meter.

or

- DUT cannot ever be disconnected while we change ranges in meter. Like in an device is measured in standby and then in active mode but without reset because meter disconnected one shunt and then connected the other. It must preserve connection and only change shunt value.

Standby and active without reset. The measurement happens on the same cable. Imagine a DMM doing break before make, autoranging and resetting the DUT every time.

9

Other Equipment & Products / Re: Pace ADS200 soldering station

« Last post by pope on Today at 11:13:18 am »

When I can get hold of it in the UK, I'll test out the new version.

That'll be great. As a current owner I really do hope that an "upgrade" is possible.

10

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

« Last post by core on Today at 11:11:15 am »

Same with the SDS3000. Unless it's significantly more powerful, faster than the SDS2000X HD, I have the same problem.

Double the memory, double the sample rate, double the bandwidth...
The 3000 series can then cost more.
Whereby the "significantly faster" would still have to be defined in terms of what is meant by this.
One second of acquisition time, for example, remains one second, even with the most expensive scopes in the world.

I don't need a lot of memory, bandwidth or sampling rate.
I have some of that with Rigol, but it has big shortcomings in many other ways.

But I would like it to be fast when running math functions, FFT, Bode, etc.
How is the SDS3000 vs SDS2000X HD in this respect?