Products > Test Equipment
R&S HMP4040 voltage spike at PSU turn-off
rf-messkopf:
--- Quote from: rf-messkopf on October 10, 2023, 08:11:55 am ---I'll dig out the cal certificate and post the date, but this will take a few days.
--- End quote ---
Okay, here it is: calibration date is 2019-02-27. This dates the implementation of the circuit change that prevents the voltage spike at mains turnoff to early 2019.
electr_peter:
--- Quote from: pdenisowski on October 10, 2023, 11:04:04 am ---Short version: there are some older HMP’s that show this behavior if channels are not disabled before switching off the device (the recommended shutdown procedure). We implemented a hardware change several years ago that prevents this from happening, and this modification can be made by our service department if needed.
--- End quote ---
Regarding voltage spikes when switching channels off with mains button, does modification fall under warranty or "service circular"?
pdenisowski:
--- Quote from: electr_peter on October 12, 2023, 08:39:59 pm ---Regarding voltage spikes when switching channels off with mains button, does modification fall under warranty or "service circular"?
--- End quote ---
I'd recommend contacting your local / regional service department: I'm on the product management side and am not sure how service handles this, especially in different regions.
mahi:
For those wondering how old their HMP power supply is and can't find the original calibration certificate, you can retrieve it via the Rohde & Schwarz website: Download calibration certificate. Just enter the device ID (case sensitive!) and it should recognize the device and offer a download link.
Anyway, to get back to this issue. I got in touch with Rohde & Schwarz customer support in Germany:
The (huge) voltage spikes when switching channels off with mains button is a known issue of the HMP series that can be fixed with Service Circular 16282 by Rohde & Schwarz Service.
Rohde & Schwarz does not provide direct service to private customers (at least not in Europe) so I had to inquire for pricing via a distributor or partner. I received a quote for my HMP4040 of just over 1100 EUR (without VAT and without shipping).
That's almost half of what a new HMP4040 costs. Ouch! That's bit more than I was hoping for (maybe I am naive)...
EEVblog:
--- Quote from: mahi on November 10, 2023, 01:01:41 pm ---For those wondering how old their HMP power supply is and can't find the original calibration certificate, you can retrieve it via the Rohde & Schwarz website: Download calibration certificate. Just enter the device ID (case sensitive!) and it should recognize the device and offer a download link.
--- End quote ---
Wow, does any other manufacturer have this?
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