Siglent Bench DMMs SDM3065X, SDM3055 and SDM3045X

[KungFuJosh]

Well, I was in 10bit mode, so it was probably 6bits. 😉😉

Anyway, here it is also being accurate in 10 and 20mV/div.

Using SDG2122X as a ref.

[mawyatt]

Using a SDG2042 at 1KHz (Edit:10KHz), {100KHz} Sine, [10KHz Triangle], 1Vrms setting, we just did a quick sanity check with these, all in Vrms (SD):

SDS2000X+  in 10 bit mode           1.007 (1.007) {1.009) [1.004]
DHO814                                       1.004 (1.009) {1.005} [1.007]

SDM3065X 3Hz filter and average  0.999047 (0.999591) {1.002099} [0.999194]
KS34465 #1 3Hz filter and average 0.9999419 (1.0005105) {1.0008633} [1.0001987]
KS34465 #2                                 0.9999388 (1.0005261) {1.0005467} [1.0001601]
DMM6500  3Hz filter and average   0.9999689 (1.000422)  {0.9996228} [1.000037]
AG34401A  3Hz filter                    1.00001 (1.00057) {0.998214} [1.000133]

These DSOs are somewhat respectable for lower frequency AC RMS measurements, agree well with various DMMs, and of course should well outperform any DMM at higher frequencies.

The two KS and the DMM6500 utilize digital sampling techniques, while the SDM3065A  and AG34401A utilize old school analog (AD636 maybe) techniques.

Would be an interesting involved test to see how well these old school techniques behave relative to the newer sampling techniques wrt to rms readings at various frequencies, amplitudes and crest factors.

Best,

[Martin72]

Interesting, I'll go along with that.

(SDG2122X, 1khz, 1Vrms,Hi-Z)
SDM3065X : 1.00305 Vrms
Brymen BM859s : 1.0041 Vrms
SDS2504X HD DVM : 1.006 Vrms
SDS2504X HD : 1.00658Vrms

Oh yes,
The day before yesterday a used SDM3065X-SC slipped through my fingers, the seller only wanted €600 for it, saw it too late....

[KungFuJosh]

Nice, looks like a lot of trustworthy numbers to me. 😉

[Martin72]

And in reality we don't know anything, that's metrology.

The generator as an AC source to check...I didn't realize that...

[KungFuJosh]

Yes, yet another reason I'm glad you convinced me not too sell it. 😉

And thanks to @J-R for the suggestion of using it as an AC ref.

[mawyatt]

Guess we can infer that the SDG2042X provides a reasonably stable output in these ranges, that the SDM3065AX
 agrees well with the other DMMs, and that the different techniques to extract an RMS readings agree well.

Edit: we added some more readings above.

Best,

[delvo]

Can I play too? The ones that were within arms reach:
(SDG2042X (SDG2122X), 1khz, 1Vrms, Hi-Z)

34401A      1.002113 Vrms
SDM3065X   1.001751 Vrms
SDS1204X-E   1.01 Vrms (not the most useful resolution on this one)
Fluke 28 II        1.0034 Vrms
UT139C       0.998 Vrms
ZT-702S (M)      1.000 Vrms
ZT-702S (O)      1.00 Vrms

[exe]

How about rising frequency to, say, 10kHz and 100kHz?)

[mawyatt]

How about rising frequency to, say, 10kHz and 100kHz?)

See # 1676 above, edited with Sine at 1, 10, 100KHz and Triangle at 10KHz.

Best,

[tautech]

Anyone have their SDM3065X open to help identify some fried parts ?
https://www.eevblog.com/forum/repair/siglent-sdm3065x-repair/
TIA

[vikrep]

Hello! Can anyone help with the question. I want to buy a RS-PRO RSDM-3055 second hand multimeter, but it doesn’t have documentation and software. I asked the RS-PRO company to download the software EasyDMM, but they refused without invoice number. Is the software from Silent SDM3055 compatible with RS-PRO RSDM-3055 and is it possible to update the firmware there or re-flash firmware fully to Siglent?
Thank you.

[tautech]

Hello! Can anyone help with the question. I want to buy a RS-PRO RSDM-3055 second hand multimeter, but it doesn’t have documentation and software. I asked the RS-PRO company to download the software EasyDMM, but they refused without invoice number. Is the software from Silent SDM3055 compatible with RS-PRO RSDM-3055 and is it possible to update the firmware there or re-flash firmware fully to Siglent?
Thank you.

Work through the list of downloads here:
https://int.siglent.com/download/?ProId=26

[figurativelythedevil]

Posted this in another thread but was pointed here.

I'm having an issue with my SDM3065X-SC, not sur if anyone's run into this before. Did a bit of looking and couldn't find an obvious answer.

I have my meter connected to PC via USB, and I'm trying to use EasyDMM to set up a scan, I have 5 thermocouples and 2 voltages I want to monitor. I can set up all the scan parameters with no issue, but when I connect to the meter to push the scan config and actually scan, the meter just locks up and I get an error in EasyDMM saying Failed to Query. Setting up the scan directly on the meter works fine and it scans no problem.

Does anyone know what's going on? I have the latest firmware & software revs. I've read the manuals and am following the instructions therein.

[KungFuJosh]

Does anyone know what's going on? I have the latest firmware & software revs. I've read the manuals and am following the instructions therein.

Since it sounds like you have all the device and software configs correct, the error is likely due to a comm issue. Possibly the ethernet cable, or firewall settings in your computer or router. For example, if the device and/or software expect 2-way communication, but maybe only one direction is working, that could cause an issue.

[coromonadalix]

good quality cables too


lan example

i have Siglent stuff in automated project,  if the cable are poorly made,  i have failed communications, and we don't run them at maximum output

tried for fun  some "flat" lan cables and they all fail  loll

[KungFuJosh]

Absolutely, good cables are a must. I only use over spec'd shielded cables.

[figurativelythedevil]

I'm currently connected via the USB that came in the box. Also, using the standard "Measure" feature instead of "Scan" works with no issues in EasyDMM. The trouble seems only connected to the scan function.

[KungFuJosh]

I'm currently connected via the USB that came in the box. Also, using the standard "Measure" feature instead of "Scan" works with no issues in EasyDMM. The trouble seems only connected to the scan function.

Could be the USB port. USB2 vs USB3 some devices are pickier about using them. However, cables that come with stuff I usually throw in the trash. 🤷

[phecap]

A few weeks ago I purchased a Siglent SDM3055.
The device has firmware version 1.02.01.28 installed.
This version cannot yet be downloaded from www.siglenteu.com.
Does anyone know what has changed compared to version 1.01.01.27R2?

[james38]

I think that you have probably benefited from having an upcoming update
that will probably only be officially rolled out later.

But maybe it's a version written for a new hardware version.
I see that this one has V 03-00-00-13-00
I have here from V 02-00-00-11-00

[Mortymore]

I have an SDM3055 with the HW version 03-00-00-13-00 bought over a year, and the SW version is the 1.01.01.27R2 (and I might have updated it when the SDM arrived)

On the other hand I have an SDM3045X,  6 months old, HW version 03-00-00-05-00 that came with the SW version 5.02.01.09R2 that I never hacked because of that 02 in the SW version.

I don't know what's the difference between versions 01 and 02 in the software, but the 02 ones are not available for download, only being deployed with recent SDMs

[KungFuJosh]

Soooo I might have bought an SDM3065X.

SW 3.02.01.12R1
HW 02-02-00-05-00

This toy is a little different than the "lesser" models... So I RTFM. But it's still odd. It looks like the manual incorrect with DCV. This is what the manual (E02B) shows:


But this is what my DMM shows for DCV:


Doesn't matter what Aperture is set to, the average is 1.4mV with nothing connected (either no probes, or with probes not touching anything). I understand that there's Rel, or manual calibration where I can probably zero that out, but should I really need to?

ETA: Auto Zero doesn't appear to do anything.

With a voltage source it does appear quite stable.

[tautech]

Doesn't matter what Aperture is set to, the average is 1.4mV with nothing connected (either no probes, or with probes not touching anything). I understand that there's Rel, or manual calibration where I can probably zero that out, but should I really need to?

Floating 10G Ohm inputs......
Open inputs could indicate anything, short them. 

[KungFuJosh]

Doesn't matter what Aperture is set to, the average is 1.4mV with nothing connected (either no probes, or with probes not touching anything). I understand that there's Rel, or manual calibration where I can probably zero that out, but should I really need to?

Floating 10G Ohm inputs......
Open inputs could indicate anything, short them. 

Shorted it seems normal ~7µV. The 3055 is ~6µV shorted, not a big deal. My question is if I should be concerned about the open value or not. Is that a sign of anything I should be concerned about? I have 3 SDM models, and only the 3065 does that open.

OTOH stability is excellent. Here's a comparison:
3065X:


3055:



I'm guessing this might be another case of me needing to let the stupid thing run for a while. 🤷