After using the Keithley 236 SMU a lot in the last months without any problems, it suddenly showed the message "IOU Cal Checksum Error" and "IOU EEROM Failed" after power on. Additionally, while booting, it strangely showed a GPIB address different to the one set in the menu. It also was not possibl...
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Measuring Cell Capacity
As the previous repaired 6632B Power Supply is able to sink current up to 5A, I tried to characterize some Li-Ion cells by discharging with constant current, while getting the measured Voltage and Current back from the supply over GPIB using remote sensing. A fuse has been added in series for safety...
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ADF4351 Frequency Synthesizer
Signal Generators are usually very expensive and not easily affordable for the average user.
A cheap generator can still be built using a Wideband Frequency Synthesizer like the ADF4351, which can output frequencies from 35-4400 MHz. The internal VCO runs from 2.2 to 4.4 GHz, the range from 35-2200...
Marconi IFR 2023 / 2024 Error 508 Repair
Recently, I have bought a defective Marconi IFR 2023A signal generator from eBay. The listing said "parts or repair unit" and that the power supply is missing.
Missing power supply
The Marconi needs 5V,+/-12V and 24V, therefore I replaced the missing power supply with a Meanwell RQ-125D. The cur...
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