Author Topic: The Siglent SDG2042X Thread (Read 566871 times)

Roger Need · « **Reply #1400 on:** May 13, 2021, 06:57:09 pm »

Roger

Quote from: colorado.rob on May 11, 2021, 03:33:47 am

In the attached screenshot you can see that the SDev value is 3.86... Hz.

How do you get the 2042X to save a screenshot to the USB flash drive? I have not found anything in the User manual.

Roger

bicycleguy · « **Reply #1401 on:** May 25, 2021, 10:26:45 pm »

Any idea when Siglent will update the Python examples to Python3 as 2 is soon to be deprecated and I don't want to spend any more time with it.

tautech · « **Reply #1402 on:** May 25, 2021, 10:35:15 pm »

Quote from: bicycleguy on May 25, 2021, 10:26:45 pm

Any idea when Siglent will update the Python examples to Python3 as 2 is soon to be deprecated and I don't want to spend any more time with it.

This one ?
https://siglentna.com/application-note/programming-example-create-a-stair-step-waveform-using-python-and-pyvisa-using-lan-sdg1000x-sdg2000x-sdg6000x/

bicycleguy · « **Reply #1403 on:** May 25, 2021, 10:56:12 pm »

tautech,
Thanks ! That was fast!

~~I haven't got it working yet, but close.~~ Got it working from my mac, awesome!

exe · « **Reply #1404 on:** May 26, 2021, 09:00:36 am »

Quote from: tautech on May 25, 2021, 10:35:15 pm

Quote from: bicycleguy on May 25, 2021, 10:26:45 pm
Any idea when Siglent will update the Python examples to Python3 as 2 is soon to be deprecated and I don't want to spend any more time with it.
This one ?
https://siglentna.com/application-note/programming-example-create-a-stair-step-waveform-using-python-and-pyvisa-using-lan-sdg1000x-sdg2000x-sdg6000x/

On my screen the formatting is corrupted: indentation seems to be lost. (identation is essential for python scripts to work)

ebastler · « **Reply #1405 on:** May 26, 2021, 03:43:33 pm »

Quote from: exe on May 26, 2021, 09:00:36 am

Quote from: tautech on May 25, 2021, 10:35:15 pm
https://siglentna.com/application-note/programming-example-create-a-stair-step-waveform-using-python-and-pyvisa-using-lan-sdg1000x-sdg2000x-sdg6000x/

On my screen the formatting is corrupted: indentation seems to be lost. (identation is essential for python scripts to work)

The copy of the source code in the downloadable ZIP file is fine though.

colorado.rob · « **Reply #1406 on:** May 27, 2021, 12:52:15 pm »

Quote from: Roger Need on May 13, 2021, 06:57:09 pm

Roger
Quote from: colorado.rob on May 11, 2021, 03:33:47 am

In the attached screenshot you can see that the SDev value is 3.86... Hz.
How do you get the 2042X to save a screenshot to the USB flash drive? I have not found anything in the User manual.

Roger

I grab screenshots via SCPI over the network.

https://gist.github.com/mobilinkd/8a07cc124946c87715c6a1458118411e

Timpert · « **Reply #1407 on:** June 03, 2021, 08:18:35 am »

A couple of days ago I had a power supply failure on my SDG2042X. The whole unit just went dead after it had been powered on continuously for a couple of days. Of course I dove right into it, and I found that one of the Schottky rectifier diodes for the +18V supply had shorted out. It was diode D21 in this picture (from member Blue): https://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/?action=dlattach;attach=1205132;image. I removed that diode and the unit happily started up, running the 18V on one diode only. The diode that was still working barely heated up. Also, the voltage across the diodes is fine (no reverse voltage peaks can be seen on a 200 MHz bandwidth scope) and the current drawn from +18 V is not more than 0.5 A. So D21 did not have any reason to fail, but it did nonetheless. I replaced both D20 and D21 with BR36 diodes (rated for 3 A instead of 2) and everything seems to work fine again. The diodes remain cool as far as I can tell with my IR thermometer and finger test.

I also noticed that I have an old version of the power supply. Mine uses an NXP TEA1610T controller which is now listed as obsolete on the NXP website. The one from Blue uses an ST controller (L6599AD) and has a different layout at the primary side, but at the secondary side it looks the same as mine. The startup resistors on mine are warm but not alarmingly hot. Still puzzled about the cause of that diode failure though. It really shouldn't have died.

Timpert · « **Reply #1408 on:** June 06, 2021, 06:56:54 pm »

The generator has been powered up continuously for four days since the repair without issues. So I guess I did fix it

.

Just out of curiosity I took the failed diode and measured it. Sure enough, my bench DMM saw it as a short in both directions. So then I connected it to my lab PSU and cranked up the current in what would normally be blocking direction. All of a sudden, it became a diode again! It read perfectly normal as a Schottky diode after the treatment, so I guess the die was OK, but somehow (whisker?) a parallel short circuit had developed.

Another thing I noticed: I was running firmware 2.01.01.23R8. After the repair, I updated it to 2.01.01.35R3B2. After the update, the power consumption increased by one Watt. So apparently, the new firmware makes the FPGA work a bit harder. At first I was planning to put in a somewhat quieter fan, but I guess it would be better to just keep the original fan. Perhaps interesting to do a bit of research on this, but for now I'll just go back to using it.

blurpy · « **Reply #1409 on:** July 13, 2021, 04:54:23 pm »

I've done some measurements of the THD of the SDG2042X using a QA401 audio analyzer to see how it stacks up to the datasheet:

Quote

Total Harmonic Distortion: 0.075% @ 0 dBm, 10 Hz ~ 20 kHz

These are the raw numbers from my measurements:

And in a graph to see the trend more easily:

Here's what the spectrum looks like for 20Hz @ 1V RMS:

And for 1kHz @ 0dBm/0.224V RMS:

And 1kHz @ 7V RMS:

And lastly 20kHz @ 3.6V RMS:

You can see 2 channels on these images, and the left (yellow) channel is the SDG2042X, and the right (red) channel is the signal coming from the built in generator of the QA401, for comparison. The SDG can go up to 7V RMS, while the built in generator will go almost to 2V RMS, so in some of the screenshots the voltage levels between the channels will be different.

The SDG does better than the datasheet specifies in all cases. It does quite well across the audio frequency range, with 20Hz being slightly worse than other frequencies. Above 20Hz you get around 0.004% and 0.005% THD up to about 3.5V RMS before it steeply climbs to around 0.03% and 0.04%.

I found it fun looking into this. I didn't think it would do so well, since I've been hearing how it's useless for audio. It's useless for measuring modern DACs and preamps of course, but it will be good enough for many power amplifiers. Low distortion, but not ultra low distortion.

mawyatt · « **Reply #1410 on:** July 14, 2021, 12:05:00 am »

Thx for the effort, results are better than I expected

Best,

Calvin · « **Reply #1411 on:** July 14, 2021, 05:03:24 am »

Hi,

the QA401´s ADC own optimum Level-vers-THD range is around -16dBV.
When measuring the Analyzer in loopback one can see the HD2 breaking through the noisefloor from -16dBV on up.
The THD curve @20Hz/0dB probabely shows more of the ADC´s own distortion than the actual DUT´s distortion.

regards
Calvin

blurpy · « **Reply #1412 on:** July 14, 2021, 05:04:32 pm »

Quote from: Calvin on July 14, 2021, 05:03:24 am

Hi,

the QA401´s ADC own optimum Level-vers-THD range is around -16dBV.
When measuring the Analyzer in loopback one can see the HD2 breaking through the noisefloor from -16dBV on up.
The THD curve @20Hz/0dB probabely shows more of the ADC´s own distortion than the actual DUT´s distortion.

regards
Calvin

Here is one at 20Hz -13dBV for comparison:

If we compare them we can see that HD2 for the loopback is lower than on the 0dBV graph, while HD2 for the SDG is more or less the same. So it could be that at -13dBV it's the SDG that is the limiting factor, and at 0dBV it's the ADC. I am not sure. Interesting comment.

yaybee · « **Reply #1413 on:** August 19, 2021, 09:27:37 am »

Hi,

Anyone tried the SCPI mode command?
I can get it from PHASE-LOCKED to INDEPENDENT, but MODE PHASE-LOCKED does not work to go back.
Can we report this somewhere?

From programming guide:
3.30 Mode Select Command
DESCRIPTION
This command sets or gets the phase mode.
COMMAND SYNTAX
MODE <parameter>
<parameter>:= {PHASE-LOCKED, INDEPENDENT}.
QUERY SYNTAX
MODE?
RESPONSE FORMAT
MODE <parameter>
EXAMPLE
Set the phase mode to INDEPENDENT:
MODE INDEPENDENT

Hexley · « **Reply #1414 on:** August 19, 2021, 06:03:59 pm »

Could not reproduce the issue on an SDG1032X. The MODE command switches from PHASE-LOCKED to INDEPENDENT and back to PHASE-LOCKED as expected.

Any chance of a typo in your SCPI command string?

yaybee · « **Reply #1415 on:** August 21, 2021, 06:38:20 am »

Thx,

I am using the Testcontroller of HKJ and it shows the right command being send. However this is the only command with a dash in it I use.
Need to make a line trace to see what is actually transmitted.

Hexley · « **Reply #1416 on:** August 21, 2021, 04:56:51 pm »

FWIW, I also used HKJ's software. Here is a screen dump for reference. Hope it helps.

yaybee · « **Reply #1417 on:** August 26, 2021, 06:37:51 pm »

Thx again,

I made a trace with WireShark and I cannot see any errors on the input, but still no mode switch.

Trace from INDEPENDENT to PHASE-LOCKED , this does not work:

Code: [Select]

234	126.942140	192.168.1.101	192.168.1.11	VXI-11 Core	126	V1 DEVICE_WRITE Call (Reply In 235) LID=0 mode?\n
235	126.943784	192.168.1.11	192.168.1.101	VXI-11 Core	90	V1 DEVICE_WRITE Reply (Call In 234) No Error
236	126.961020	192.168.1.101	192.168.1.11	VXI-11 Core	122	V1 DEVICE_READ Call (Reply In 237) LID=0
237	126.962630	192.168.1.11	192.168.1.101	VXI-11 Core	114	V1 DEVICE_READ Reply (Call In 236) No Error MODE INDEPENDENT\n
395	253.518632	192.168.1.101	192.168.1.11	VXI-11 Core	138	V1 DEVICE_WRITE Call LID=0 MODE PHASE-LOCKED\n
396	253.520265	192.168.1.11	192.168.1.101	VXI-11 Core	90	V1 DEVICE_WRITE Reply (Call In 395) No Error
407	257.349581	192.168.1.101	192.168.1.11	VXI-11 Core	126	V1 DEVICE_WRITE Call (Reply In 408) LID=0 mode?\n
408	257.351193	192.168.1.11	192.168.1.101	VXI-11 Core	90	V1 DEVICE_WRITE Reply (Call In 407) No Error
409	257.362494	192.168.1.101	192.168.1.11	VXI-11 Core	122	V1 DEVICE_READ Call (Reply In 410) LID=0
410	257.364713	192.168.1.11	192.168.1.101	VXI-11 Core	114	V1 DEVICE_READ Reply (Call In 409) No Error MODE INDEPENDENT\n

Trace from PHASE-LOCKED to INDEPENDENT, this works:

Code: [Select]

21	10.449654	192.168.1.101	192.168.1.11	VXI-11 Core	126	V1 DEVICE_WRITE Call (Reply In 22) LID=0 mode?\n
22	10.451537	192.168.1.11	192.168.1.101	VXI-11 Core	90	V1 DEVICE_WRITE Reply (Call In 21) No Error
23	10.461278	192.168.1.101	192.168.1.11	VXI-11 Core	122	V1 DEVICE_READ Call (Reply In 24) LID=0
24	10.463151	192.168.1.11	192.168.1.101	VXI-11 Core	114	V1 DEVICE_READ Reply (Call In 23) No Error MODE PHASE-LOCKED\n
74	29.456721	192.168.1.101	192.168.1.11	VXI-11 Core	138	V1 DEVICE_WRITE Call LID=0 MODE INDEPENDENT\n
75	29.458428	192.168.1.11	192.168.1.101	VXI-11 Core	90	V1 DEVICE_WRITE Reply (Call In 74) No Error
79	35.880618	192.168.1.101	192.168.1.11	VXI-11 Core	126	V1 DEVICE_WRITE Call LID=0 mode?\n
80	35.882400	192.168.1.11	192.168.1.101	VXI-11 Core	90	V1 DEVICE_WRITE Reply (Call In 79) No Error
81	35.897741	192.168.1.101	192.168.1.11	VXI-11 Core	122	V1 DEVICE_READ Call (Reply In 82) LID=0
82	35.899510	192.168.1.11	192.168.1.101	VXI-11 Core	114	V1 DEVICE_READ Reply (Call In 81) No Error MODE INDEPENDENT\n

So I hope someone will test this on the SDG2042X/SDG2122X with firmware 2.01.01.35R3B2, just to be sure.

Later this week I will publish my latest version of the SDG Testcontroller config. I hope you have a look at it.

Orange · « **Reply #1418 on:** August 26, 2021, 07:04:01 pm »

Yep, this is a bug in firmware 2.01.01.35R3B2

Python code
-generator is in phase locked mode when issued-

Code: [Select]

inst.write('*IDN?')
print(inst.read())
inst.write('MODE?')
print(inst.read())

inst.write('MODE INDEPENDENT')
inst.write('MODE?')
print(inst.read())

inst.write('MODE PHASE-LOCKED')
inst.write('MODE?')
print(inst.read())

Output

Code: [Select]

Siglent Technologies,SDG2122X,SDG2XCAC5RXXXX,2.01.01.35R3B2

MODE PHASE-LOCKED

MODE INDEPENDENT

MODE INDEPENDENT

Hexley · « **Reply #1419 on:** August 27, 2021, 12:02:16 am »

Quote from: yaybee on August 26, 2021, 06:37:51 pm

So I hope someone will test this on the SDG2042X/SDG2122X with firmware 2.01.01.35R3B2, just to be sure.

Later this week I will publish my latest version of the SDG Testcontroller config. I hope you have a look at it.

It is interesting that the firmware levels for 1000X and 2000X have diverged. The 1000x is still on V1.01.01.33R1B6. I thought they were kept in sync, but perhaps not. Not sure that I would be in a hurry to upgrade to 35R3B2, even if it is released for the 1000X family. :-)

Looking forward to trying your new config file for TC.

yaybee · « **Reply #1420 on:** August 28, 2021, 06:36:26 pm »

@Orange, thanks for confirming the error.

@Hexley, the new Testcontroller version is available, see https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/msg3652198/#msg3652198

Hexley · « **Reply #1421 on:** August 28, 2021, 06:57:31 pm »

Quote from: yaybee on August 28, 2021, 06:36:26 pm

@Hexley, the new Testcontroller version is available, see https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/msg3652198/#msg3652198

Got it and loaded it. Will report any feedback in HKJ's thread.

Messtechniker · « **Reply #1422 on:** September 03, 2021, 06:30:26 am »

My SDG2042X produces a bit of 50 Hz noise thus affecting
any THD + Noise measurements

See PICs. This noise is definitely from the generator,
since is disappears upon switching the generator output off.
Are any mods known for this?

hpw · « **Reply #1423 on:** September 03, 2021, 08:48:05 am »

A simple ground loop issue... use star connections

Or use symmetric setup one as + the other phase inverted.

Also for Audio measurement not the yellow one the egg... as first harmonics at -90 dB

ebastler · « **Reply #1424 on:** September 03, 2021, 12:34:16 pm »

Quote from: hpw on September 03, 2021, 08:48:05 am

A simple ground loop issue... use star connections
Or use symmetric setup one as + the other phase inverted.

Or, since the spectrum was apparently acquired by AudioTester PC software: If it is running on a notebook, just run it on batteries for the duratrion of the measurement.

Quote

Also for Audio measurement not the yellow one the egg... as first harmonics at -90 dB

Well, it's a 16 bit generator. Not too bad, is it?


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