Products > Test Equipment

R&S HMP4040 voltage spike at PSU turn-off

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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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