New 7½-digit DMM from Hantek - HDM3075 Series - Page 1
Forum section: electronics / general

author: Jendas
author_rank: Newbie
timestamp: August 02, 2025, 05:43:37 pm
content: Hello,for the information of voltnuts here, a new Hantek HDM3075 - 7½-digit DMM was released -https://hantek.com/products/detail/18234.Best regards,Jendas

author: Vgkid
author_rank: Super Contributor
timestamp: August 02, 2025, 07:29:26 pm
content: Interesting , so they "cloned"* a 34470a* I didn't do a deep dive comparing specs.

author: Hydron
author_rank: Super Contributor
timestamp: August 02, 2025, 07:34:32 pm
content: Wow they didn't even try to hide it - it's copied down to the button labelling/placement, including the soft buttons and display layout! I mean there is only so much differentiation possible with this sort of instrument (without doing weird shit like Rigol's wheel of buttons) but this just seems unnecessarily lazy.

author: tooki
author_rank: Super Contributor
timestamp: August 02, 2025, 08:27:57 pm
content: Well that’s nothing new — they slavishly cloned the 3446x user interface (both the software and the front panel) for their lower-count bench DMMs already.

author: floobydust
author_rank: Super Contributor
timestamp: August 02, 2025, 08:39:34 pm
content: HDM3075 praised as a milestone for china - their first mass-produced 7.5-digit multimeter.Qingdao Hantek "National High-tech Enterprise" is a special qualification. State backed, for the country's economic competitiveness.Given Keysight outsources the 34470a manufacturing, what did they think would happen lol. It's been cloned!Wonder what the price is.

author: Hydron
author_rank: Super Contributor
timestamp: August 02, 2025, 08:46:49 pm
content: Surprised it took this long tbh, the technology has been around in documented fashion for decades (and right here we've got hobbyists here doing their own 7.5+digit class ADCs).

author: exe
author_rank: Unknown
timestamp: August 02, 2025, 08:55:25 pm
content: It seems to be less than 800 euro here:https://www.indiamart.com/proddetail/hantek-hdm3075-benchtop-multimeter-7-5-digit-multimeter-2855738812773.htmlIf it's under 800 euro, I might be in. Otherwise I'm good with my old-but-stable K2000.

author: fsasm
author_rank: Newbie
timestamp: August 04, 2025, 02:20:18 pm
content: From your source, the 6½-digit HDM3065 would cost around 680€ and the 7½-digit HDM3075 would just cost 10% more (750€). I know that for EU I should add 20% for customs. Still the price for the HDM3075 is unbelievable low for me because I'm under the impression that 7½ and 8½-digits DMM are very difficult to design and manufacture reliably.

author: Kleinstein
author_rank: Super Contributor
timestamp: August 04, 2025, 02:38:47 pm
content: There is no very sharp definition on when a meter can be called 7.5 digits. The old Keithley 2001 and new DMM7510 are quite different grades. It might be as little as a selected HDM3065 with a slightly better (e.g. ADR1399) reference. The price is relatively low and I thus would not expect a LTZ1000 reference inside.

author: Sorama
author_rank: Frequent Contributor
timestamp: August 04, 2025, 03:00:26 pm
content: Quote from: exe on August 02, 2025, 08:55:25 pmYou can buy the 3065 for 700€ without vat at Eleshop.

author: Simmed
author_rank: Frequent Contributor
timestamp: August 04, 2025, 03:50:03 pm
content: someone will need to measure itand put a new line on the chartshttps://www.eevblog.com/forum/metrology/dmm-adc-noise-comparison-testing-project/275/https://www.eevblog.com/forum/metrology/dmm-adc-noise-comparison-testing-project/350/

author: miro123
author_rank: Frequent Contributor
timestamp: August 04, 2025, 08:09:03 pm
content: I was excited when I Read this message and look at the specification.Then I look at tear down of their 5 1/2 and 6 1/2 digit. After that I reduced my expectations for HDM3075.HDM3055 Vref is ADR03 HDM3065 uses MAX6225It look like both are using discrete ADC - Most likely AD7175Still questions remain how do they achieve this spec? Is this not the new Aneng moment, when they delivered 10..15$ pocket multimeter with spot on measurement.

author: Kleinstein
author_rank: Super Contributor
timestamp: August 04, 2025, 09:51:53 pm
content: The best accuracy in the 10 V range suggests that they either use an ADC (disctrete build MS) for directely the 10 V range or use a good ADC chip and than a periodic check of the gain via a direct measurement of a 7 V ref. in the 10 V range. My guess would be more with the later.16 ppm 1 year specs sound about OK for an ADR1399 ref. with a little burn in. Not so good 1 hour specs suggest a not so great ADC, but could also be just overly conservative or a lack of stricter testing. The AD7175 as ADC is very much possible.

author: iMo
author_rank: Super Contributor
timestamp: August 05, 2025, 01:43:43 pm
content: When comparing the prices off the India's seller site above - 76500 7.5d vs 68990 6.5d (delta79.7085.53USD) the only difference in hw will be a better reference (and perhaps a different Caddoc res.) and in sw adding 1 digit on the LCD and in the math....

author: DaneLaw
author_rank: Frequent Contributor
timestamp: August 06, 2025, 04:01:32 pm
content: The price jump from 6½ to 7½ does seem low, and the details under the 7½ does not seem to match HDM3075.. That seems to have 50k readings/s, not 30k like the 6½ & 5½..https://www.ataltools.com/search.html?ss=HDM

author: Hydron
author_rank: Super Contributor
timestamp: August 06, 2025, 04:05:46 pm
content: Quote from: iMo on August 05, 2025, 01:43:43 pmI guess that lines up with just copying Keysight!

author: _Josh_
author_rank: Newbie
timestamp: September 30, 2025, 01:35:02 am
content: Looks like the price range of the HDM 3075 series meters come in at just under $10 000Chinese Seller:https://maykei.com/product/hdm3075b/($9 000)New Zealand Seller:https://keystonelabs.co.nz/shop/measurement/multimeters/hantek-7-5-digit-precision-digital-bench-multimeter-hdm3075b/($7 500)Previously another seller was referenced (IndiaMart), I don't trust that this seller is actually selling 3075's as while the item name features "3075", and photo's of the 3075 from Hantek's website, the listed specs refer to the 3065 series meters... and the price reflects this too.

author: aronake
author_rank: Frequent Contributor
timestamp: September 30, 2025, 05:26:37 am
content: Typical price on Taobao seem to be around 40K CNY. Its not too certain on actual availability.https://item.taobao.com/item.htm?abbucket=12&id=970793030159At that price, I think most people would buy a DMM7510 or 34470a instead.

author: GigaJoe
author_rank: Frequent Contributor
timestamp: September 30, 2025, 06:44:06 pm
content: actually it just US$365https://www.alibaba.com/product-detail/Original-Genuine-Product-Hantek-HDM3075-Series_1601562169087.html

author: eurofox
author_rank: Unknown
timestamp: September 30, 2025, 07:34:39 pm
content: Quote from: GigaJoe on September 30, 2025, 06:44:06 pmI wrote them that I'm willing to order one.

author: eurofox
author_rank: Unknown
timestamp: October 03, 2025, 03:27:52 pm
content: My Hantek meter arrived todaySo many digits ....

author: aronake
author_rank: Frequent Contributor
timestamp: October 03, 2025, 04:12:25 pm
content: Quote from: eurofox on October 03, 2025, 03:27:52 pmWhere did you buy from? How much did you pay? Do that calibration certificate include actual measurement data or just say its in spec?_

author: gamalot
author_rank: Super Contributor
timestamp: October 03, 2025, 04:20:43 pm
content: Quote from: aronake on October 03, 2025, 04:12:25 pmIt's not the 7.5-digit one.

author: grumpydoc
author_rank: Super Contributor
timestamp: October 03, 2025, 04:42:55 pm
content: Quote from: eurofox on October 03, 2025, 03:27:52 pmI should contact the courier, they've dropped a digit on the floor somewhere.

author: mawyatt
author_rank: Super Contributor
timestamp: October 03, 2025, 06:13:56 pm
content: Looks like a blatant copy of KesightBest

author: iMo
author_rank: Super Contributor
timestamp: October 03, 2025, 06:28:37 pm
content: .. a teardown will tell what kind of copy it is like..

author: eurofox
author_rank: Unknown
timestamp: October 04, 2025, 09:14:52 am
content: Quote from: gamalot on October 03, 2025, 04:20:43 pmI never say that it was a 7 1/2 digit, you can read on the calibration sheet that it is a 6 1/2 digit, was calibrated end August 2025.With respect to my message to Alibaba I got the answer that they are closed, should get an answer on October 9.

author: eurofox
author_rank: Unknown
timestamp: October 04, 2025, 09:19:16 am
content: Quote from: mawyatt on October 03, 2025, 06:13:56 pm​I bought in the past the same multimeter from Agilent and a 1.5Ghz oscilloscope for $$$.Right now I don't want to buy anything from the US.

author: Overspeed
author_rank: Frequent Contributor
timestamp: October 05, 2025, 09:07:49 am
content: Quote from: eurofox on October 04, 2025, 09:19:16 amHelloIn the 70's 80's 90"s ... US mage was the rule as most electronic equipments was US made as HP , Keithley , Lecroy ... but now China is a player .10 year ago my $$$$ Lecroy 9410 have displayed a strange error message .. I have the Lecroy doc but nothing regarding this defect message , I call Lecroy , the answer was , we will charge you 1700 Euro for a quote to repairWith 1700 Euro I have purchased a brand new Siglent 4 x 200 Mhz .So except for high range equipment as 8.5 Digits perhaps but for other equipements challengers exist , and Japan have also very good equipments manufacturer .RegardsOS

author: eurofox
author_rank: Unknown
timestamp: October 09, 2025, 05:48:54 am
content: Got answer from Alibaba ....

author: hp3310a
author_rank: Regular Contributor
timestamp: October 09, 2025, 06:38:53 am
content: Same here US$ 5115 shipped.

author: max-bit
author_rank: Frequent Contributor
timestamp: October 09, 2025, 08:24:07 am
content: Copy Keysight ....

author: max-bit
author_rank: Frequent Contributor
timestamp: October 09, 2025, 08:24:48 am
content: Can someone send photos of the inside?

author: eurofox
author_rank: Unknown
timestamp: October 09, 2025, 11:00:37 am
content: Quote from: max-bit on October 09, 2025, 08:24:48 amWhy? You want to copy it?

author: Hydron
author_rank: Super Contributor
timestamp: October 09, 2025, 11:50:46 am
content: Quote from: eurofox on October 09, 2025, 11:00:37 amThe whole point of this forum is to be curious about electronics. Try asking Dave the same question

author: ivo
author_rank: Regular Contributor
timestamp: October 13, 2025, 09:10:08 am
content: I'm guessing there's at least a couple people wanting to know if it's using an ADR1399, or something elseAnd if they're still using some relatively schmicko AD 24bit ADC, or if they actually designed their own digitizer

author: Kleinstein
author_rank: Super Contributor
timestamp: October 13, 2025, 09:49:41 am
content: The speed specs for the new Hantek and Sigilent 7.5 digit version are still the same. This suggests that the same ADC is used and the upgrade is mainly with the reference. The good SD ADC chips are noise wise well good enough for 7.5 digits. The INL can be a bit limiting.

author: mawyatt
author_rank: Super Contributor
timestamp: October 13, 2025, 04:29:12 pm
content: What does Keithley and Keysight use in their 7.5 digit DMMs for References?Best

author: Kleinstein
author_rank: Super Contributor
timestamp: October 13, 2025, 05:19:48 pm
content: There are not that many 7 digit range DMMs.Keithley DMM7510 : LTFLU referenceKeithley 2001 long term LM399 and low noise Zener for short time ADC ref.Keithley 2010 long term LM399 and low noise Zener for short time ADC ref.Keithley 2182 ADC and ref. essentially the same as 2010 , more a nV meter, not a DMMKS 34470 LTZ1000Datron 1271 LTZ1000 + LM399 (as additional check ?)Solartron 7071 1N829A with TC compensationPrema 6047 LM399

author: gamalot
author_rank: Super Contributor
timestamp: October 13, 2025, 05:31:14 pm
content: Quote from: Kleinstein on October 13, 2025, 05:19:48 pmI have a Keithley 3706.The 34420A is also a 7½-digit instrument.https://www.eevblog.com/forum/testgear/keithley-3706-modification-install-front-panel-terminals

author: EC8010
author_rank: Frequent Contributor
timestamp: October 13, 2025, 05:34:02 pm
content: Also:Hioki DM7275 LTZ1000Solartron 7075 Not specified in the manual, probably a 1N829A within the Solartron oven, certainly not LM399, LTZ1000, or LTFLU

author: Adilpickles
author_rank: Newbie
timestamp: October 13, 2025, 07:44:05 pm
content: Isn't the Datron 1271 a 8.5 digit meter like its brother, 1281? I think the main difference is the use of dual ltz1000s (with a different selfcal circuit?), and a longer integration time for the 1281.

author: bsw_m
author_rank: Frequent Contributor
timestamp: October 14, 2025, 05:21:09 am
content: AlsoAdvantest R6871E: 1N829 with zenner current adjustment for minimize TC.

author: Overspeed
author_rank: Frequent Contributor
timestamp: October 14, 2025, 10:37:32 am
content: Quote from: EC8010 on October 13, 2025, 05:34:02 pmHelloThe 7075 schematic for the Voltage refRegardsOS

author: laichh
author_rank: Regular Contributor
timestamp: October 18, 2025 12:20:58 pm
content: https://www.siglent.com/siglent-sdm4075a-series-release/Wasn't aware of this 2nd 7½ digit multimeter from China in 2025.Detail could be found at:https://www.siglent.com/products-overview/sdm4075a/

author: iMo
author_rank: Super Contributor
timestamp: October 18, 2025 01:34:48 pm
content: USR932 ref diode.

author: Kleinstein
author_rank: Super Contributor
timestamp: October 18, 2025 03:33:00 pm
content: I very much doubt they would use one of those old 9.3 V ref. diodes. These are essentially no longer available or used.The modern good references are mainly: LTZ1000, ADR1000, ADR1001, LTFLU (would be Fluke / tek only), REF80, ADR1399 (may ideally want more than 1).

author: iMo
author_rank: Super Contributor
timestamp: October 18, 2025 04:30:40 pm
content: Quote from: Kleinstein onYesterdayat 03:33:00 pm..Solartron 7075..

author: Kleinstein
author_rank: Super Contributor
timestamp: October 18, 2025 04:59:01 pm
content: The solartron 7075 is some 40 years old and would be about the last generation of instruments to use those compensated zerners. The 9.3 V version with 2 or even 3 forward diodes where not that common even back than. The more common one was the 1N829 and related with 1 forward diode and a zener.The main 2 candidates to expect are LTZ1000 and ADR1399. A version with an ADR1399 would absolutely makes sense, but would only be a small step up. It is anyway a bit tricky to reach good accuracy (low long term drift) as there is also a voltage divider as part of the DMM, as the ADC does not directly accepts a 7 V reference or 7 V input signal.

author: GigaJoe
author_rank: Frequent Contributor
timestamp: «Reply #49 on:Todayat 01:43:54 am »
content: speaking about siglent 7D it around 32K yuan's , somewhere US$4Klowest uncert. 10V range .. I assume it not off shelf ADCmanuals snapshot , indicating January 2025, and mid September officially ... still for a price it 4K it over 6K in canadian ... merely theoreticalsiglent new 6D has 2V as lowest uncert, that probably non custom ADC .. ; new line are black 40XX DMMs US$950