Updated image. FW .23
I know now three versions. .15, .20 and .23.
FW .23 is compatible least SDG1010 and 1025 ( I have used for both)
.15: TFT driving is with one word: Terrible!
(it maybe that there is (was) totally something wrong with TFT drive in FW level becouse also contrast/wiev angle was "wrong")
.20: TFT colors are still littlebit like candy store but not this heavy contrast issue with .15
(this image looks something like this or between .15)
.23: TFT mainly due to reduced candy colors looks good. Also .20 version display cursor cosmetic bug is repaired.
(this have less candystore colors and visuallu more clear to look and perhaps better for western markets (but of course one like apple and one like jackfruit)
Later I will take picture what show TFT after FW upgrade.[/i][/color]
Here:
I have made small tests with SDG1025
Now first some tests with sinewave and some modulations.
Disclaimer: Yes, I'm also biased and I know its dangers and I try regognize it and avoid its affect too much. Im not seller who only sell as many "nice boxes" as can. I'm too honest for this. Also maybe important point is that many of peoples are also my friends (here locally) and I need look these peoples face to face also after sell some equipment. Equipments prices are so low that my faces price is just incredible value over these prices... so..
I have my faces with tens of years experience with electronic hobby and also tens of years experience with industrial electric and electronics design and also repair and building/developed some new things (today mainly in history).
Outside building quality is better what I expect. Very good if think price class.
Keyboard works perfect and same for rotary encoder.
Display is ok, but I want adjust it more dim... but can not. (If I design these colors ... after then it looks more harmonic and more expensive)
Also buttons do not need so much force that it moves whole unit... nice to use.
Also cursors below rotary knob can handle easy with same time as turn know with single hand.
Two separate channels, 14bit vertical resolution for BOTH channels, 16k for arb, 125MSa.
Pity they are not (expensive) isolated floating differential outputs... they have common GND.
There is fan and it is not silent but, noise level is not bad and also tone of voice is nice low.
But yes, these are made now in Siglent best factory product lines and they are really NOT Atten factories..
(and please do not mix it to Atten! Atten have example ATF 20B what is nearly as piece of bullshit - one look to details in specifications and it can wonder why they make this? For who?)
Full sets of test images you can find here .(tests are also continuing but first now this sine..)
Here some random examples:
Pictures are self-explanatory (look carefully also SA settings).
(
Note: noise level is mainly SA noise level with these settings
Note: SA reference level 0 is set for +17dBm
Note: Noise level is more low if reduce RBW but sweep time is so long that waiting time is too long for this purpose.)
2MHz
7MHz
Some test with modulations.
Carrier 20MHz
Turn AM on and modulation depth 30% with 800Hz mod frequency (sine, internal (adjustable)
Same as before but DSB-AM (USB + LSB)) Double sideband (DSB) available, not separate USB or LSB sidebands and not ISB (ISB = DSB so that sidebands are independently modulated.).
But this is better than nothing.
Sidebands well clearly over +60dBc
All available modulations: AM, DSB-AM, FM, PM, FSK, ASK, PWM, (+sweep and burst)
FM deviation 25kHz.
Agen some sinewave, now audio area.
(signal +17dBm)
1MHz to 100Hz (only some samples)
+17dBm (@50ohm)
With more low levels there are some better results.
Also, it can see with Keithley 2015THD (20Hz - 20kHz)
Depending about signal level THD is between <0.03 - <0.1% from 20Hz to 20kHz.
Freq affect only littlebit. Whole level range is divided to several level "bands"
It looks like THD is most low in every band upper borders, specially around 0.7Vrms.
(also when I look this with spectrum analyzer and slowly stepping down level with
small increments, it can clearly see how 2nd and 3th harmonic
level change several dB's just cross over these level bands borders.
20kHz
5kHz
1kHz
100Hz (this is limit for SA, it can go more low but result is not very accurate)
(also if look carefully here can see small frequency offset, between SDG1000 and spectrum
are both only with they own internal references.
My opinion is that overall not bad result with sinewave quality for this kind of function generator.
But it need tightly classify to its own price class.
If this is 3k price, I give lot of negative arguments.
But for normal entry-level and middle and even higher level hobby use it is good. Also it is usable in many professional use BUT it is NOT even nearly High-End "state of art" equipments. There is no any kind of competition with these.
If you need some special good for some special purpose, many old professional units give maybe best result together with price. (but you need really know these equipments, there are goods and bads.. and then "do not even touch" equipments even if they have been expensive in history. (I do not want name these! and do not ask... I do not tell.. exept in some very rare case)
SDG1000 Better than I have expect.
It have some FW bugs, minor bugs, cosmetic bugs and some more severe but overall it works well and after 5 minute learning.. UI can use very simple in most needs. I have not yet find any total freezes or crashes.
Maybe one of most bad (orange or nearly red class error, some one may classify it as fatal error)
This really BAD FW "bug" error: if try set signal level value using dBm. (it do not work ok between -1dBm to +1dBm and most bad is that if adjust with knob to this area... it really do some fatal (this is Signal generator) it may turn output level to full!
Attention: Before new FW update what (I hope soon!) repair this.. with sensitive electronics tests do NOT use dBm, use Vp-p or Vrms.
To be continued... mainly there (bottom is link)