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| Data logging with UT61E+ and UT61E question |
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| JenniferG:
Hi y'al, it's been a while. I'm working on a project with DIY vactrols where I am doing PWM writes to the LED from an Arduino Mini Mega. I've been measuring the resistance of the LDR (photoresistor) with PWMs from 0 to 255 and manually recording them in a spreadsheet. This is too tedius; I want to automate the testing of all 256 values and have it generate a comma delimited list I can simply import into spreadsheet. Someone suggested a UT61E for logging the data, via RS-232. I bought the newer UT61E+ and it has a IR to USB cable with it, not the IR to RS232 cable. I've seen a python program for parsing out the RS232 data from the UT61E; I read the UT6E comes with the RS232 cable instead of the USB cable. Would this same program work with my UT61E+ if I bought the UT-D02 rs232 cable for the UT61E+ ? This UT61E+ I bought a couple weeks back, has a dent on it, so I am going to return it regardless. Maybe I should just buy the cheaper UT61E instead since it coems with the rs232 cable. Ultimately I am going to port over the code from the Python to a C++ library on the Arduino. Because I'd like to skip the PC/MAC altogether and have the same Arduino which generates the PWM to the LED in the DIY Vactrol to also read the RS232 data from the UT61E/E+. Hope my questions make sense. EDIT: I wish my Gwinstek GDM-825A bench multimeter had ability to send results over RS232 other than TRUE/FALSE; I read the manual and it only seems to send the result of a comparison test.. pass or fail... not the actual ohm reading. |
| JenniferG:
Btw, I tried building an auto-ranging ohm meter on my Arduino after someone shared the project on youtube.. it uses an 8 channel mux (4051) with 8 reference resistors. I found it to be way off for some lower values and off a bit for higher values. However I have since watched some videos how to improve things by using an analog reference voltage, filtering with caps etc.. Should I pursue making a better ohm meter on the bread board, for easy data logging or just buy the appropriate UT61E/UT61E+ (i.e. with rs232 cable) ? |
| HKJ:
The interface used from UT64E and UT64E+ is very different: UT64E uses a virtual COM port. UT64E+ uses a HID interface. For many meters with a virtual COM port you can use https://lygte-info.dk/project/TestControllerIntro%20UK.html to do the logging. |
| JenniferG:
I think I am just going to go with the UT61E since it has RS-232. I really want to log to the arduino with it. The arduino is controlling the voltage changes to the LED and my program can then read the multimeter after making the voltage change. Don't know how I'd do that with the above program. Makes sense if the arduino controls everything in my case. The arduino would create a two column comma delimited list of "PWM value" as well as the Ohms reading for that partciular PWM. Anyways, the UT61E with "Uni-T" brand on it is for sell on amazon for $75, however I see a Tekpower UT61E on ebay for $50. They look the same except for the brand silkscreen in top left corner. Should I save $25 and get it? over 50 were sold on ebay: https://www.ebay.com/itm/165010229698 |
| HKJ:
--- Quote from: JenniferG on November 17, 2022, 08:09:36 am ---I think I am just going to go with the UT61E since it has RS-232. I really want to log to the arduino with it. The arduino is controlling the voltage changes to the LED and my program can then read the multimeter after making the voltage change. Don't know how I'd do that with the above program. --- End quote --- It is fairly easy to connect a Arduino to the above program, there is a couple of examples in the documentation. This means you can combine values from the Arduino and the UT61E in the log. The program also has a script language that allows it to automatic send commands to a device, i.e. you can do control from the program. There is a long thread about it here: https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/ Using Arduino with TestController: https://lygte-info.dk/project/TestControllerArduino1%20UK.html https://lygte-info.dk/project/TestControllerArduino2%20UK.html |
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