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Hantek LCR 1832C unlock

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Randy222:

--- Quote from: wind999 on February 08, 2024, 06:55:22 am ---I confirm what you have written on this forum, no calibration for freq 50khz-100khz. I made the measurements and indeed for 50khz a measured resistor the Theta angle moves from 0 to 50, and for 100khz even gone to 80degrees.

So, i read about this intervention in the passive components in the LCR meter, particularly C66-C69 capacitor on the PCB. Here https://www.creationfactory.co/2021/03/reverse-engineering-and-unlocking.html?showComment=1622733342560#c2775361835350856538 and on page 2 and Page 4 on this forum post. On page 4 user MIRW, suggested "it's not just the firmware you need to change, you have passive parts too, you mean replacing C66 and C67 with 10 and 100 pf".

So, has someone replaced these capacitors, and obtained the calibration? And what type are these capacitors 1206, 0806 or 0603SMD so I can order from AliExpress?

Someone has even suggested that removing these capacitors the meter works fine "If these capacitors are in 1833, then their capacity should be 3 times less, parallel to the 100kOhm calibration resistor was a 22pF capacitor, 10kOhm - 245pF. The device works great without these capacitors at all. It may be necessary to adjust at high frequencies by installing capacitors, but the capacitance must be calculated for a 100kHz filter." from the website - https://www.creationfactory.co/2021/03/reverse-engineering-and-unlocking.html?showComment=1622733342560#c2775361835350856538

--- End quote ---
I think it was noted somewhere, the caps in 1833 were not 3x less, I think it was mentioned some were greater than the 1832.

ru_tash:

--- Quote from: wind999 on February 08, 2024, 06:55:22 am ---

So, has someone replaced these capacitors, and obtained the calibration? And what type are these capacitors 1206, 0806 or 0603SMD so I can order from AliExpress?


--- End quote ---
I tried remove C66, the smallest capacitor (56pF if I remember right) in the row, the removal spoiled measurements on frequencies 10-40KHz and not improved on frequencies 50-100kHz, so I returned it back.
I believe that hardware of 1832-1833 is identical, the issue is in the software(firmware).

wind999:
Thank you ru_tash for sharing this information. In that case for now i will not intervene in the hardware of the 1832C, i will try to find something in the firmware. Maybe comparing 1832C and 1833C before and after calibration can tell as something. Anyway, thank you.

wind999:
Does anyone know what command or button on the device will display this message. "STANDARD IMPEDANCE CALIBRATION. OPEN_SHORT CAL MUST BE COMPLETED FIRST. PRESS KEY TO START CAL (300mV)"

I just open the LCR2023041001.dfu with BeyondCompare to compare the old dfu (LCR2021061501.dfu) to see any changes. I noticed that this message is not displayed while standard calibration process is initiated. It can be found in both firmware’s, but the new one LCR2023041001.dfu, contained some changed values. However, the procedure exists in both firmware’s.

wind999:
This is corrected post after several messurment on different resistors.
Here are the measurements for the 22ohms, 120 ohms, 1k, 10k, 22k, 100k and 1M ohms resistor as well as the Theta angel. See attachment. These measurments are done on Hntel 1832c just with the software modification mentioned in this forum, no hardware intervention.

The Theta angle is interesting, the value should remain 0,but i noticed three groups. First group measured between 8-120ohms, maybe more i didn't have other resistors, the 50-100Khz band remain with same Thetha angle, the second group is 1K to 10K, and the third group is 22k and 1M oms resistors. Are these the calibration models that the device is building, probably.

These measured values are very close to the measured value of djQUAN, after changing C66 and C67 capacitors, maybe some of them are better??. He wrote at page 3 "And the result with the 10k resistor test is more sensible but the reading has a slight rolloff. 9.66k from 100Hz to 40k then 9.57k @50khz, 9.52k @ 75kHz, 9.45k @100khz."

Maybe this confirms that the problem is in the firmware, not the hardware? But how so, when it is the same firmware for both devices. It would be nice if someone with the Hantek 1833c measures just for comparison the 10k resistor, and what the device will say.

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