Logging a voltage and a current in the same time - Page 1
Forum section: electronics / beginners

author: AlexResch
author_rank: Regular Contributor
timestamp: September 06, 2018, 09:45:36 am
content: I would like to log a voltage ( 6.3V ) and a current ( 150mA) in the same time and then use the table to build a graph. Is there a multimeter which can do that at some chosen frequency ( aprox 3-5 times/second ).

author: KE5FX
author_rank: Super Contributor
timestamp: September 06, 2018, 09:49:51 am
content: Quote from: AlexResch on September 06, 2018, 09:45:36 amTheMooshimetermight be a good option for you. They are quite handy.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 06, 2018, 10:04:46 am
content: Metrix MTX3283 DMM can log V and I in the same time (3 wires only), fastest sample rate is 1 measurement/second, and the maximum length is about 3000 measurements. The log is kept inside the DMM, so it can log without a PC.

author: joeqsmith
author_rank: Super Contributor
timestamp: September 06, 2018, 11:05:24 am
content: Five samples/second with V/I may be an expensive meter. You may be better off with a cheap microcontroller evaluation board with a decent ADC.There is always the Analog Devices, or in my case I have a Labjack.

author: JS
author_rank: Frequent Contributor
timestamp: September 06, 2018, 01:55:37 pm
content: 121GW?JS

author: AlexResch
author_rank: Regular Contributor
timestamp: September 06, 2018, 02:17:51 pm
content: Quote from: RoGeorge on September 06, 2018, 10:04:46 amI see RS lists it as discontinued. And isn't it French ? Or "frantuzesc" as you people say ?

author: RoGeorge
author_rank: Super Contributor
timestamp: September 06, 2018, 03:28:52 pm
content: That's what I have, it makes nice charts and could export the logged data. This is an example of logged U and I for a LiIon battery, in order to calculate the battery's capacity.Yes, it's a French DMM, made by Chauvin Arnoux. "Frantuzesc" is spelled "franțuzesc" in Romanian, with diacritic "ț" instead of "t", but I don't get what's the point about that.

author: AlexResch
author_rank: Regular Contributor
timestamp: September 06, 2018, 04:30:01 pm
content: Quote from: RoGeorge on September 06, 2018, 03:28:52 pmWell, looks like what I would like - unfortunately it's been discontinued by RS.No point about "franțuzesc", it just sounds strange. My mother is an ethnic German born in Romania and I have some passing familiarity with the language.

author: IanB
author_rank: Super Contributor
timestamp: September 06, 2018, 04:50:27 pm
content: Quote from: AlexResch on September 06, 2018, 09:45:36 amMy solution to this was to use two or three multimeters, and to create my own logging software that could capture data from several meters simultaneously into one log file.

author: joeqsmith
author_rank: Super Contributor
timestamp: September 06, 2018, 05:21:01 pm
content: Quote from: IanB on September 06, 2018, 04:50:27 pmMany of the cheap ones can only sample once per second. You may need to synchronize and stagger them to get the sample rate up. Ten UT61Es should do the job.

author: AlexResch
author_rank: Regular Contributor
timestamp: September 06, 2018, 05:31:41 pm
content: Found this :https://www.picotech.com/data-logger/picolog-1000-series/multi-channel-daqI wonder if it'll do the job. Does anybody have any experience with it ?

author: IanB
author_rank: Super Contributor
timestamp: September 06, 2018, 06:15:20 pm
content: Quote from: joeqsmith on September 06, 2018, 05:21:01 pmI had good luck with the (now discontinued) Radio Shack model 22-812. When you enable send on the COM port it sends out a continuous stream of data at a rate of 4-5 samples per second. By using USB to COM port adapters I can have as many COM ports on my host machine as I need to plug the meters into.I have rarely had a need to sample more than about once per second, so I wrote the software to accumulate readings in the background at the maximum sample rate and then log average/max/min for each recording interval. My typical recording intervals have been from 1-10 seconds.