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| LCR Meter Plot Software |
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| RoGeorge:
Thanks! :) A Ge diode would be interesting, too, to compare its temp variation with the Si one. |
| mawyatt:
You are welcome!! Don't have any Ge diodes (or SiC), agree would be interesting to see their behavior!! Do have some others tho, here's Zener and SBD. Best, |
| Hexley:
--- Quote from: mawyatt on April 12, 2023, 06:11:00 pm ---Finally able to get things working on PC with the TH2830, and even included versions which allow DC Bias Sweeps with Bias Fixture and external Power Supply. --- End quote --- Do you have any charts with extended range DC sweep (from zero to 32 volts, say) done with the GPP-4323? Apologies if they are already posted, but I did not spot them when going through this thread. I saw your post in the TestController thread related to controlling the GPP-4323, and was curious to see if you found any artifacts in the setpoint and readback of the GPP sweep when it changed ranges internally. I have seen those in similar applications (V-I measurements of UV diode strings, for example) when sweeping the GPP-4323 with a script. Nothing that cannot be dealt with, just something to be aware of. |
| mawyatt:
We've added using Quadratic Regression to extrapolate the Quadratic Coefficients to estimate the fixture temperature with applied DC voltage. Now Temperature Sweep is entered as Start, Stop, Step and Time Delay and a LCR measurement of selected parameters is done at each Step temperature increment, rather than entering DC voltages to achieve a given temperature. Also used heat shrink tubing to hold the thermocouple to the ceramic power resistor body. Anyway, attached is version 2 of the Python routine which uses the TH2830 LCR meter, with SDP3303X Power Supply, SDM3065 DMM with "K" Thermocouple and a Ceramic 10 Ohm 10W resistor as heat source. Also a plot of a cheap 100nF 50V Ceramic Disc @ 1KHz that shows the capacitance and ESR variation with temperature, note the slight improvement with ESR at ~40C. We've seen this before in some cheap bypass type capacitors and suspect this is a characteristic of the high K dielectric ceramic material utilized. Added another plot of a small 6.3V 1000uF Polymer. Best, |
| mawyatt:
--- Quote from: Hexley on April 28, 2023, 04:04:26 pm --- --- Quote from: mawyatt on April 12, 2023, 06:11:00 pm ---Finally able to get things working on PC with the TH2830, and even included versions which allow DC Bias Sweeps with Bias Fixture and external Power Supply. --- End quote --- Do you have any charts with extended range DC sweep (from zero to 32 volts, say) done with the GPP-4323? Apologies if they are already posted, but I did not spot them when going through this thread. I saw your post in the TestController thread related to controlling the GPP-4323, and was curious to see if you found any artifacts in the setpoint and readback of the GPP sweep when it changed ranges internally. I have seen those in similar applications (V-I measurements of UV diode strings, for example) when sweeping the GPP-4323 with a script. Nothing that cannot be dealt with, just something to be aware of. --- End quote --- Don't have any more plots with the GPP, but don't recall any serial port or read back issues with it, worked just like the SDP3303X. However, wasn't paying close attention but do remember that it was quite stable after leaving it running for almost an entire day. One issue with the GPP we were/are having is trying to communicate thru the USB port, can't get the port to even open, but since we were able to get the RS232 port working didn't pursue this at the time. BTW if you want I can set up the GPP and check it, let me know. Best, |
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