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Fnirsi SG-003A & SG-004A Signal Generators

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DaneLaw:

--- Quote from: Aldo22 on November 13, 2024, 03:28:24 pm ---Does the SG-003A have any (general) use for a hobbyist who already has an AWG, a DPS-150 PSU and relatively accurate DMMs?
I've seen all the videos on it, but I still don't get it.
Yes, you can convert voltages to frequencies, for example, but for what purpose do I need that?
Does anyone have a scenario that justifies the purchase of this device for non-professionals?

It's cheap, it's kind of tempting, but I should recognize some purpose for myself before I order it.

Thank you.

--- End quote ---
I like mine, to the point that I wondered about also getting the SG004A (0.02%) Do value having volt, mA, and various aspects of frequency control in a small handheld form factor and you can use it to calibrate or check low-count devices, and you can set up crude programs.. its surprisingly feature-rich for a "process meter".
But It ain't living up to its tolerances, throughout its full span..
The conversion factor is just a linear relationship, where you can lock fx a given input to create the other.

I use SG003A for many things, not least crude high powered lasers.. where many run on analog or pwm controlled drivers, and the programs, and stepping are useful with fx 20W RGB laser module,
but even just playing around with fx current clamp to check minute single-digit mA current values.. works well to see how accurate a given meter is.. even though SG003A got a far from a so-called "clean output".
The last +2 years.. surprised me how much I use it, do value having a current/voltage, frequency-source in such a small handheld battery form-factor.,
9mA into an LED

--- End quote ---

with clamp.

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but if you don't have any specific use cases.. save your money, as there will always come new items and there are limits to what kind of accuracy you gonna get, at these prices..
Its not a new item, I got mine in summer 2022 and the prices today haven't gone down, vs what they cost in mid-2022, that today seems higher.
The YT channel "three phase" have many good videos about these handheld signal calibrators and also examples industrial usecases.
When I compare my SG003A to other handheld process calibrators.. that can go down to single digit uV and gives granular 1uV control, there is a quite a difference, but that goes without saying, as the prices are also in another ballpark... worth noting the SG003A doesn't have resistance..

Aldo22:
@DaneLaw
Thanks for the detailed answer!  :-+

The decision would be easier for me if I didn't already have the DP-150 as a small, portable V/A PSU.
Although it doesn't get into the lower mV/μA ranges, it sems more accurate in the mV range.
I found this list to compare.

In the attached picture you can see that the DP-150 is more accurate from e.g. 50mV to 250 mV (up to almost 1V, after that the SG-003A is also accurate).

Well, maybe accuracy is not the main purpose of the SG-003A.
I still find it hard to say: “Yes, I need it”.  ;)

P.S. Did you get anywhere with MODBUS?

Aldo22:
Any resistance was futile. I ordered it for 33 GBP.  :palm:
Maybe I'll find a use for it.
A German proverb says: “Der Appetit kommt beim Essen”  ;)

HLMBDD:
Hi,

i update my SG-003A to V4.3 and it stops booting, can you please help me to fix this problem
and if you could to share previous firmware versions prior than V4.3

when i connect it to laptop i steal can see the bootloader folder i tried to reload the bin file again and i get Errapp.txt file created in the bootloader folder
thanks.

Aldo22:
Has anyone gained any deeper insights into the remote control of this device (Modbus)?
I'm struggling to understand the documentation.

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