How to promote an USB oscilloscope to individual engineers? I am the Loto instru

[trobbins]

are you saying the noise is lower when you use a battery/linear reg to provide 5v rail compared to that dc/dc module?
do you have enough pcb room to add typical datasheet LC filtering, or even local C filtering?

[jiangtao.lv]

The vendor of power module recommend no LC filtering, because that will change its load character.I only use several C. I did not try  battery/linear reg , because I need -5v power supply. I did try a TI LDO to supply -5V, it's not good enough. I'm satisfied with this power module till now.

[brabus]

I like that PCB! Looks very neat.

Some things I would do differently:

- That large D-Sub connector looks so outdated, not to mention the limited number of insertions. Sure a nice Molex board-to-board connector would be way nicer;
- C6 and C10. Are those variable caps? What are they adjusting, exactly? I never saw anything adjustable on a board since a long time.

Keep up the good work! 

[jiangtao.lv]

Thanks brabus:
I used two 37 Pins D-sub connectors as you see, it indeed limit my extension, I use every pin now with no one spare. Users are not suggested to disassemble and install this module too often, so the main consideration is the price factor in my choosing this connector. Honestly, a couple of these connectors takes me less than 0.5 $. I put a picture in the attachment about what it looks like in the final.

C6 and C10 are used in the signal input attenuation network. In a low frequency input situation, I can regardless of the caps, but in a high frequency situation,  i need to adjust them right as a factory calibration before ship to customers. Show in attachment:

[tszaboo]

As this is clearly a toy, I suggest going after the maker market, not professional engineers.

[jiangtao.lv]

As this is clearly a toy, I suggest going after the maker market, not professional engineers.

Hi,NANDBlog:
Is there a good forum for these maker in the west or USA? Could you recommend it to me ?

[Simon]

this forum covers a very wide range of users from the absolute beginner to the very experienced.

[jiangtao.lv]

hah,it seems too experienced for me.

[brabus]

You know, if your product is good and attractive, the maker movement will find it and love it (and buy it!).

But if you try to seel something to the maker community, be prepared for a high barrier. A maker rarely is a pioneer when it comes to tools: it has to be noted and reviewed on some relevant place, like here, or Hackaday, or Sparkfun, just to name a few of the top boards.

[bayati]

Check this out: http://www.tnmelectronics.com/English/LptScope.htm
The 20Mhz one is about 150$ in Iran. Due to the sanctions and high price of oscilloscopes, you can have a good market in Iran.

[jiangtao.lv]

nice,20M here takes 50$~60$. 25M takes about 90.

[jiangtao.lv]

Finally , I finished the DS for it. There is a limitation for the size of attachment,so I depart it into two.

[exe]

Quickly looked the first video, looks bogus to me. Starting from noise comparison, then capturing 20MHz signal with *X1* probe... And somehow a 200MHz scope (with effective bandwidth over 350MHz, afaik) gets worse reading than a 50MHz one?? I won't be surprised if 50Ohm termination is set incorrectly. On top of that the title says "performance of USB oscilloscope OSC802 comared to the desktop one". This simply doesn't make sense at all. You are implying that your device is better, but it's clearly not. The whole video looks like a hoax from start to end. That's the worst advertisement you can do for your product in engineering community.

[rsjsouza]

Finally , I finished the DS for it. There is a limitation for the size of attachment,so I depart it into two.

Good looking datasheets. A few comments.

Features:
1. Add "weight" to the first line (up to 210g) - it helps with the claim of being "portable"
2. Remove "provide". "General Purpose I/O interface (TTL 3.3V)"
4. Remove "provide". "Open software API for third party development"
5. remove "with no additional power required"
9. Supports serial bus decoding (selected models)

Applications: it seems there is a mix of product features and the applications. A few examples I found are:
2. What is "Embedded in teaching equipment"? Perhaps re-write to: "Embedded electronics courses for the educational market"
3. "Ripple and noise measurements for power supply characterization"
4. "Serial bus decoding of multi-sensor systems"
5. "Analog data acquisition systems" This seems to be a feature and not an application. Also, "DIO control"? Perhaps re-write to Digital I/O control
6. "Current and Voltage recording" is a feature, not an application. The application would be "Solar power supply and lighting systems"
- "Diagnostics device for field engineers"

I would remove the periods at the end of every sentence inside the table. Usually periods are not used in this context.

The Specifications table on pages 2 and 3 of the second datasheet have confusing headers. At page 2 there is a black bar with four columns with model numbers, while at page 3 the same four columns are shown without a header, only to change to three columns all of a sudden.

Also, the placement of the 20mV/div on the "Typical" row at the end of page 2 is strange.

I would also move the physical specs, temperature, compliance and languages to the end of the table.

Perhaps add a section that talks about the minimum specifications of the PC software and the Android app.

The table "At a glance" should come after "Applications". It allows people to quickly grasp the most suitable product for them.

At page 4, the DB15 drawing on the right has a tabulation issue with the pin 12 description. Still on this page, the description for pins 8 and 9 are smaller, which could instead be extended out to have the same font size. If horizontal spacing is not enough, you could have a single drawing and simply describe pin 9 as "9:IO4 (only on OSC48x)"

Page 5: there is no space between the M and the Hz, as well as the numbers and their units. For example:
10x: 60MHz, 10MΩ, 600V CAT II

At the same page, remove "Printer cable". I would specify it as a "USB2.0 compliant, length: 1m (or whatever length it is), USB Type A Male to USB Type B Male."

[glarsson]

Page 4 mentions a mythical DB15 connector but shows what appears to be a DE15 connector. If the connector is the same as for VGA then it's a DE15. A DB15 would be the same size as a DB25 but with only 15 pins. I've never seen one of those.

Also, software is missing for Mac OS and iOS.

[ogden]

I used two 37 Pins D-sub connectors as you see, it indeed limit my extension, I use every pin now with no one spare. Users are not suggested to disassemble and install this module too often, so the main consideration is the price factor in my choosing this connector.

I am puzzled about decision to make that supposedly low cost scope modular, with prehistoric & ugly DB- connector in a middle. Why? For what? IMHO cost of the split case, connector and assembly expenses do not offset USB socket and ez-usb IC (there's nothing much more on the interface board).

[Gary.M]

Jiangtao,

Do not be discouraged by many of the responses here. You have come to a forum full of engineers. Engineers do not know how to write politely and with consideration. They can be quite rude. However there is still good advice to be found in what they have written.

Sent from my MI 8 using Tapatalk

[rsjsouza]

Page 4 mentions a mythical DB15 connector but shows what appears to be a DE15 connector. If the connector is the same as for VGA then it's a DE15. A DB15 would be the same size as a DB25 but with only 15 pins. I've never seen one of those.

You are right; it is a DE15. I have seen DB15s in the wild and it seems they still sell them.

Also, software is missing for Mac OS and iOS.

I think he said before that Windows and Android are the only supported options.

[glarsson]

You are right; it is a DE15. I have seen DB15s in the wild and it seems they still sell them.

Do you mean the DA15?

I think he said before that Windows and Android are the only supported options.

Exactly. That's why software for Mac OS and iOS are missing. The device is useless without software and the software is useless without anything to run it on.

[rsjsouza]

You are right; it is a DE15. I have seen DB15s in the wild and it seems they still sell them.

Do you mean the DA15?

Ues, you are right. I never paid much attention to the exact nomenclature of the D series...

I think he said before that Windows and Android are the only supported options.

Exactly. That's why software for Mac OS and iOS are missing. The device is useless without software and the software is useless without anything to run it on.

Do you have a physical unit?

[glarsson]

Do you have a physical unit?

No. Why should I buy something I can't use because of missing software?

[jiangtao.lv]

Sorry, my fault.

[jiangtao.lv]

Thank you very much ,It's very usefull of your kind advice.

[jiangtao.lv]

I used two 37 Pins D-sub connectors as you see, it indeed limit my extension, I use every pin now with no one spare. Users are not suggested to disassemble and install this module too often, so the main consideration is the price factor in my choosing this connector.

I am puzzled about decision to make that supposedly low cost scope modular, with prehistoric & ugly DB- connector in a middle. Why? For what? IMHO cost of the split case, connector and assembly expenses do not offset USB socket and ez-usb IC (there's nothing much more on the interface board).

The reason is hard to explain because of my English expression, I try to say some:
1: If I make dozens of PCBs , sure I really don't need use ugly D-sub connectors. But If I need to produce thousands of PCBs, I will think differently.
2:If I split it into two parts. one is the common part, I can change only the second one to promote a new model.The common part can work with several different
second part, vice versa.
3: If I there is an order for 1000 osc482,300 osc802, 550 osc2002, 80 oscA02. what is the most effective method for production?I don't need prepare exactly by the order.
4: with the common part ,I can opensource the second part for engineers some day.

[jiangtao.lv]

thks,yes ,it is DE-15, my fault. I 'll change it.