Products > Test Equipment

LCR Meter Plot Software

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mawyatt:
Finally getting the Tonghui TH2830 serial port working, we set out to try and create a plotting routine.

https://www.eevblog.com/forum/testgear/tonghui-th2830-lrc-meter-serial-port-how/msg4207222/#msg4207222

Decided to try python and used some Hioki python routines for accessing the TH2830, later we'll try working with the Hioki IM3536.

After a few attempts with a PC, we gave up and decided to use a RPi 3 and achieved some success! Biggest issue was finding the RPi serial port address, then things began to move forward.

This is a simple Python routine that allows plotting of the TH2830 DUT by serial RS232 connection using a USB to serial adapter, and doesn't have any error checking.

From the code we are obviously not well versed at Python programming, well any programming, but are providing this routine to hopefully help others more capable.

If folks are successful in getting/adapting this routine operating on a PC or Mac, or adds features, cleans thing up, please return results here so others (ourselves included) can benefit.

Anyway, here's a few plots of some components.

Now off to try and get the IM3536 working ::)

Best,

mawyatt:
A few more plots of Inductor and LC Networks.

Best,

oz2cpu:
WOW this is nice, super cool looking curves , exactly what i was dreaming of..

for us who dont understand python ? how easy is it to make this run on a PC ?
or even via testcontroller ?
if only a working TH2830 driver was made for testcontroller ??

mawyatt:
Originally tried to get it working on PC, but routine had issues with trying to find the pyserial files. There was something about how a PC installs Python and the supporting files path?

Maybe someone with more experience with Python on a PC can help?

BTW just updated the TH2830 version and added the Hioki IM3536 version. Have both running at same time on RPi the TH2830 on TTYUSB0 and the IM3536 on TTYUSB1.

Here's an impedance plot from the IM3536 of a 1uF Mylar cap from 4Hz to 8MHz!

Edit: This is so easy to do, so added more plots (later with dual variable capability) from the IM3536, note some of the capacitor impedance levels ;)

This shows how the effective impedance of the small 100uF 25V Polymer impedance compares with the much larger physically and capacitance 1000uF 16V Electrolytic, and the small 470uF 6.3V Polymer :-+


Best,

mawyatt:
Decided to use a quality 5uF Polypropylene cap as a final test subject for the day. This reveled some subtle resonate features of the capacitor and setup which uses the Tonghui TH26048A plug in test fixture with the Hioki IM3536 LCR meter.

You can observe the subtle resonance in the ESR plot around 3~6MHz, along with the primary sharp impedance resonance ~400KHz. Also note the low ESR ~ 0.01 Ohms at 1MHz and dipping down to ~0.003 ohms at lower frequencies.

Best,

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