RCL meters of type NJ100S / NJ200S / NJ300S - Page 1
Forum section: electronics / testgear

author: GrayCat
author_rank: Contributor
timestamp: November 05, 2020, 09:57:57 am
content: Hello!Being in search for an RCL/impedance meter at around $100, I came across some NJ100S / NJ200S / NJ300S models. They have very good formal parameters, rich set of Variables to measure, butabsolutely nothingis known about them! All I have found is some seller announsements, with the same pictures. And,User-Manualfor NJ300S.NJ100SSpecifications:Code:- Product model: NJ100S (fixed frequency)- Power frequency: 50Hz. Frequency points: 15. Frequency point value: 50, 100, 600, 1000, 6000, 10000, 20000, 30000, 40000, 50000, 60000, 75000, 80000, 93750, 100000.- Power frequency: 60Hz. Frequency points: 13. Frequency point value: 60, 120, 600, 1200, 6000, 12000, 24000, 30000, 38400, 48000, 60000, 75000, 96000.- Measuring ranges:* Resistance: 0.2mΩ~500MΩ* Capacitance: 5fF~150mF* Inductance: 0.5nH~100kHThese seem to be very good values, but no any confirmation for them.Does anybody know anything about them?

author: GrayCat
author_rank: Contributor
timestamp: November 05, 2020, 10:02:09 am
content: NJ300S_Hand.jpg(101.35 kB - downloaded 226 times.)

author: coromonadalix
author_rank: Super Contributor
timestamp: November 05, 2020, 12:30:43 pm
content: uh aboslutely nothing never saw them ill try to find price for them, where did you see them ?Aliexpress ? Banggood ?

author: GrayCat
author_rank: Contributor
timestamp: November 05, 2020, 01:29:25 pm
content: Quote from: coromonadalix on November 05, 2020, 12:30:43 pmOn EBay they are under the denoted names.On Aliexpress, they are marked as "50Hz~100KHz-24 Frequency Points 2.4 Inch TFT Screen Handheld Tool LCR Meter Digital Bridge Impedance Tester", several sellers have them.Any ideas?

author: coromonadalix
author_rank: Super Contributor
timestamp: November 05, 2020, 03:36:28 pm
content: https://www.banggood.com/50-300KHz-Handheld-Impedance-Tester-Bridge-LCR-Digital-Resistance-Measurement-Capacitance-Adjustable-Inductance-p-1738414.html?p=PA19205493643201607I&custlinkid=1304842&ID=6296786&cur_warehouse=CNhttps://www.aliexpress.com/item/1005001501380888.htmlwell got me tempted for the black friday ??

author: GrayCat
author_rank: Contributor
timestamp: November 05, 2020, 05:01:00 pm
content: Quote from: coromonadalix on November 05, 2020, 03:36:28 pmNo. I just want to know, is that NJ100S superior to Hantek 1833C. While there are plenty of info on Hantek, nobody can tell anything on the NJ.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 05, 2020, 06:02:31 pm
content: Well someone has to buy one and do a teardown and firmware dump if its possible .....Until then there's only speculations

author: GrayCat
author_rank: Contributor
timestamp: December 04, 2020, 11:18:00 pm
content: Short video on testing a 80mm wire of 0.51mm diameter with NJ100S (in Russian):https://youtu.be/POXDhURpUjYMeasure of "precise" 1 nF and 10 nF capacitors:

author: GrayCat
author_rank: Contributor
timestamp: December 05, 2020, 10:27:02 pm
content: Measuring a 2 kOhm ±1% resistor:https://youtu.be/dpYJAKPU5j4(in Russian)

author: coromonadalix
author_rank: Super Contributor
timestamp: December 06, 2020, 04:39:46 pm
content: can you open it to see the inside ? thks

author: GrayCat
author_rank: Contributor
timestamp: December 07, 2020, 06:54:17 pm
content: MCU: STM32F103RCT6 .Charger TP4056 . Flash 25Q32JVS1Q .OpAmps: U1 (voltage input), U9, U46, U47, U48 ==MCP6022. "Current Driver" U37==AD8532A. One more U7=AD8534A.Switches something like 74LVC1G3157DCKR (markings "C5K" and "C5J").

author: GrayCat
author_rank: Contributor
timestamp: December 07, 2020, 06:55:39 pm
content: All OpAmps were covered by some matte "epoxy".

author: GrayCat
author_rank: Contributor
timestamp: December 07, 2020, 07:01:04 pm
content: The device was shippedwithoutany probes. So, I had to make them myself.The LCD is "YT240L030" on a ILI9341 controller, with 18-pin interface. So, you can buy a 3.2"-one, and feel more comfortable :-)

author: GrayCat
author_rank: Contributor
timestamp: December 07, 2020, 07:03:13 pm
content: Measiring of a 1 Ohm ±1% resistor.Measiring of a 90.9 kOhm ±0.5% resistor.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 11, 2021, 03:34:00 pm
content: Thank you very much for the teardown

author: MegaVolt
author_rank: Frequent Contributor
timestamp: November 26, 2021, 12:14:49 pm
content: There is more information about this device here:https://ampnuts.com/lcr-nj100s/https://ampnuts.com/start/

author: Russ3000
author_rank: Regular Contributor
timestamp: June 09, 2023, 09:53:07 pm
content: I bought the device on aliexpress. I will compare with 1832.

author: ZhuraYuk
author_rank: Regular Contributor
timestamp: October 27, 2023, 07:31:11 pm
content: I just wonder how it shows 6 digits having only 12 bit ADC built in STM32

author: jheissjr
author_rank: Contributor
timestamp: December 30, 2024, 08:38:09 am
content: Quote from: Russ3000 on June 09, 2023, 09:53:07 pmWhat do you think of the NJ300S? Did it compare with the 1832?