Siglent SDM3055 vs. SDM3065X - Page 1
Forum section: electronics / testgear

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 02, 2023, 04:34:39 am
content: I allready have two good handheld multimeters. Brymen 869S and EEVblog BM786.But i really want an good Bench multimeter with same or better resolution and accuracy then my BM869S.I have pointed out Siglent SDM3055, but i know SDM3055 also has an bigger brother with name SDM3065X. Yes, the resolution is higher and accuracy, but iss there other reasons to buy SDM3065X instead regards to price?

author: tautech
author_rank: Super Contributor
timestamp: January 02, 2023, 08:39:21 am
content: SDM3065X has a few extra fruits but the main difference is the higher accuracy due to its LM399 Vref whereas SDM3055 uses a MAX6325 Vref.Size comparison when I had all 3, the 3055 mid stack was an early unit before the horned bumpers were added later.Datasheets reveal the other differences.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 02, 2023, 09:02:14 am
content: Quote from: tautech on January 02, 2023, 08:39:21 amThanksDo SDM3055 have higher accuracy then BM869S?

author: Kleinstein
author_rank: Super Contributor
timestamp: January 02, 2023, 12:09:55 pm
content: The SDM3055 is better accuracy, at least in most functions/ranges. In some case by quite a bit, like with resistance and lower currents.With different ranges there may still be a few point where the Bryman is more accurate because it can use a more suitable range.The battery supply and thus need for low power just requires compromises.Another point is that the SDM3055 offers a high input impedance up to 2 V (the SDM3065 has this up to 20 V).4 Wire ohm measurement is another point that handheld meters usually don't support - this may be reason for the better accuracy with resistors, especially small ones.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 02, 2023, 12:41:32 pm
content: Quote from: Kleinstein on January 02, 2023, 12:09:55 pmThanks alotBut can you explain why 2V impedance is ipoortant? Is that bad or good?

author: Kleinstein
author_rank: Super Contributor
timestamp: January 02, 2023, 12:59:59 pm
content: The high impedance mode is a good thing. One gets less loading of the voltage to measure. So one can measure a voltage with some 1 M output impedance with not too much of an error (0.01% low for 10 Gohm loading). The handheld meter with 10 M impedance would read about 10% low. If really needed one can often correct for the loading effect, but it is extra effort and usually still less accurate than using a high impedance meter.With most bench meters one can also switch to 10 M input impedance also for the low ranges, so that the meter reads near zero when open, of to use the 200 mV range as a 20 nA range.

author: tautech
author_rank: Super Contributor
timestamp: January 02, 2023, 07:44:31 pm
content: Our own member Tony Albus had a good look at all 3 of these models:

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 03, 2023, 01:12:56 am
content: Quote from: tautech on January 02, 2023, 07:44:31 pmYes, i have seen this video.I'm a little concerned of the speed of continuity reading. That was really bad. I think i saw a video that showed that with SDM3055. But i think the video was old.Can someone here that have tested that scope say something about the continuity reading speed with SDM3055?

author: tautech
author_rank: Super Contributor
timestamp: January 03, 2023, 03:46:21 am
content: Quote from: ElectricPower on January 03, 2023, 01:12:56 amContinuity speed was improved years ago and I checked the later results here:https://www.eevblog.com/forum/testgear/siglent-new-bench-dmm-sdm3055/msg772711/#msg772711As mentioned I used Joe Smith's method that he uses for HH DMM's which IMO is an excellent method to properly quantify speeds.It probably needs checking again to see if it has changed.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 03, 2023, 04:14:21 am
content: Okay. I seer the video i saw is over 7 years old.https://youtu.be/WxnSRGE82cA?t=310

author: TheDefpom
author_rank: Frequent Contributor
timestamp: January 03, 2023, 05:51:06 am
content: I can't speak for the 3055 but my 3065X has a speed of ~100ms (for reliable triggering, it will trigger as low as 25ms but isn't reliable) when tested with member Ian Johnston's DMM Continuity Tester.My BM869S has a speed of less than 1ms (for clicks), and starts to chirp at about 20ms.This has actually got me thinking about doing a video comparing all my multimeter continuity and diode mode functions for speed, this is the 2nd time in as many days that this has come up, obviously all the multimeter reviews I have done since Ian sent me the DMM CT have been done individually, but a comparison video seems like a good idea.