| Electronics > Repair |
| Agilent 34401A Serial port pints 3 (TX) 5(GND) stuck at 9V on sys (SOLVED) |
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| mawyatt:
--- Quote from: mawyatt on October 03, 2024, 03:42:56 pm ---These type cheap RS232 to USB adapters based on 340 chip work fine with our HP and AG34401As, no need for a level shifter. However you do need a Null Modem Adapter between the RS232 to USB tho. https://www.aliexpress.us/item/2251832395467136.html?spm=a2g0o.order_list.order_list_main.265.54ec1802qwN5Ri&gatewayAdapt=glo2usa Edit: BTW they also work with our other RS232 instruments, like the Hioki IM3536 and Tonghui TH2830. Best --- End quote --- Should mention that we talk to all these instruments with these cheap adapters directly with Python using standard commands as outlined in the Instruments Manuals. Here's an example: https://www.eevblog.com/forum/testgear/lcr-meter-plot-software/ https://www.eevblog.com/forum/testgear/lcr-meter-plot-software/?action=dlattach;attach=1766627 Best |
| The_Spectrum.A_idiot:
--- Quote from: Kleinstein on October 03, 2024, 04:00:29 pm ---There are serial adaters for RS232 levels and other for CMOS levels. The needed driver and converter chip alone does not tell - the difference is if they include the converter in addition to the USB-serial chip. One could check the TX output of the adater to see if one gets a 5 V or more 10 V signal level. What type of adater is used (maybe a small picture) ? --- End quote --- The whole idea was to use Node-red and serial option to query the instrument every second to get the value. This software https://lygte-info.dk/project/TestControllerInstalling%20UK.html#Starting_TestController Running on a RPI with the logging feature now logging the resistance values on the meter measuring a 1M resistor. it may show up some errors but as long as I get my data I am happy. The cable I used was a custom one and an off the shelf one. Both USB to Serial adapters worked as expected the issue was trying to use putty and ExtraPuttyTel to interrogate the instrument. With the software mentioned above all works as expected. The picture you requested :D Thank you everyone again for your help :D P.S : My GPIB modem is NI GPIB-USB-HS As I understand is limited support outside of the NI( national instruments software ) |
| mawyatt:
We started our development of the above mentioned LCR Plotting Routines on a RPI, then ported to a PC under Windows 10. Got this working, and we are not good at software, firmware and coding, so you should be able to do this without too much effort!! BTW believe the RS232 Standard is the most Non-Standard Standard ever, with all the various levels, connectors, cables and such :o Good luck with your revived 34401A :-+ Best |
| The_Spectrum.A_idiot:
Another question , How long should I let the logger run ? Already the resistance started drifting downwards (initial value 995.2525K - now 995.1699K) (it's only being a day) , Should I let it run longer ? Or rather a better question would be , when should I stop ? Thanks |
| Kleinstein:
The warm up time for a meter like the 34401 (no fan) should be in the 2 hour range. So to capture the full warm up, from initially cold to largely stable temperature this would be some 3 or 4 hours. So 1 day is plenty for the simple thermal effect. Humitidy efffects can be slower and take a few days, but I don't hing this is where you are interested in. Ideally set up the DUT and let it settle from handling well before turning on the meter, so that the transient is from the meter and not so much the DUT. |
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