FeedbackLoop | #88 - HP E4421B signal generator repair @feedback-loop | Uploaded 4 years ago | Updated 22 hours ago
This unit was picked up on eBay quite cheap because of presumably missing power supply. It turned out that the power supply is present, but a mains connector with EMI filter is missing. After installing a new filter the instrument booted up, but the output was found to be about 16dB low. The step attenuator was suspected, taken apart, analyzed and tested. Nothing was found wrong with it, and everything worked perfectly after reassembly. A bit of a mystery as to the root cause.
HP ESG-D2000A video: https://youtu.be/5M86XfPUgV0
This unit was picked up on eBay quite cheap because of presumably missing power supply. It turned out that the power supply is present, but a mains connector with EMI filter is missing. After installing a new filter the instrument booted up, but the output was found to be about 16dB low. The step attenuator was suspected, taken apart, analyzed and tested. Nothing was found wrong with it, and everything worked perfectly after reassembly. A bit of a mystery as to the root cause.
HP ESG-D2000A video: https://youtu.be/5M86XfPUgV0
