Products > Test Equipment
An investigation about ripple current of Kunkin KP184
PaWill68:
The problem of fan noise appeared when the design was changed later. Before the change, the power supply of the fan was not regulated, and the power supply voltage would rise to more than 17V due to the unstable grid voltage and burn the fan.
Noy:
I checked ma V3 version it has an ADS1232 so this FW is probably not for my device.
Interesting observation for the FAN Supply. Maybe i should add an TVS Diode? Or i hope that our grid voltage ist stable enough here in germany...
So still the question left should i mount 10nF with xx V rating on C58? Or should i left it unpopulated... I dismounted the original cap regarding to the earlier observations / solutions..
PaWill68:
--- Quote from: Noy on July 21, 2021, 08:06:35 am ---I checked ma V3 version it has an ADS1232 so this FW is probably not for my device.
Interesting observation for the FAN Supply. Maybe i should add an TVS Diode? Or i hope that our grid voltage ist stable enough here in germany...
So still the question left should i mount 10nF with xx V rating on C58? Or should i left it unpopulated... I dismounted the original cap regarding to the earlier observations / solutions..
--- End quote ---
C58 can be omitted if C57 is present. Perhaps the scheme has changed since that time.
For ADS1232 chip, the firmware will not work and will damage the device.
dl6lr:
--- Quote from: PaWill68 on July 20, 2021, 02:50:28 pm ---This firmware update is only for KP184 manufactured in 2019, 2020 and 2021, the model of the analog-to-digital conversion chip is AD7799.
--- End quote ---
Updated my KP184 Board VER:04 20191111 with AD7799, previous firmware version shown was 1801. I had to make the following changes:
1. Baudrate 9600 only, tried higher settings with no success, maybe the comm settings are not effective in the bootloader
2. Device was protected, had to first erase the flash, otherwise the flashing did not succeed. It seems it tried to auto-erase the chip, but due to 3. the process was unsuccessful.
3. After Erasing the flash, had to reboot the device with pins 8+9 bridged to get the bootloader running again, then flashing was possible.
Regards, Bernd
PaWill68:
Possibly related to the quality of the cable. I have RS232-USB on CH340 chip. It works at 115200 normally, but for the firmware I had to set the speed to 9600.
The manufacturer recommends cables based on the PL2303 chip. They are more stable.
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