FS . Rohde & Shwarz CMU200 - Page 1
Forum section: electronics / general

author: alpher
author_rank: Frequent Contributor
timestamp: February 11, 2022, 02:20:20 pm
content: Have a CMU200 on sale in very good condition, fully operational.Last calibration from 2011.Preffer a local pickup in GTA (Mississauga) in Ontario, CA, but will consider shipping to.What was done:I changed the LCD backlight from ccfl to LEDs (special LED strips), it works much better than the original.I replaced the original HDD with an SSD (it is an mSata drive in a casing / ATA adapters), I will also include the original one of course .Well, I replaced the front glass with a new one, but not original, here note that the original glass has a layer of copper mesh between the glass layers, the new lens is just a piece of glass.When using the instrument as a spectrum analyzer, it should not matter, especially since the LED backlight is less noisy than the CCFL.I do not hide that I would like to get ~ $ 700 CAD (thats canadian potatoes) ~U$550 but I am open to suggestions.https://youtu.be/nA0lvXH1P8I

author: alpher
author_rank: Frequent Contributor
timestamp: February 15, 2022, 01:29:57 am
content: Price drop $600 CAD ? I've checked a shipping costs.For example using Canada Post shipping to USA (NY) ~$100 CAD.A courier company to EU ~$100 CAD by boat (4 to 6 weeks), $200 by air (~1 week).

author: alpher
author_rank: Frequent Contributor
timestamp: February 16, 2022, 03:50:57 am
content: Installed options are in the video:<iframe width="560" height="315" src="https://www.youtube.com/embed/nA0lvXH1P8I"allowfullscreen></iframe>

author: Ice-Tea
author_rank: Super Contributor
timestamp: February 16, 2022, 07:15:29 am
content: For those not in the know: you probably don't need a 3G cell phone tester but this instrument also combines a GP spectrum analyzer and signal generator (up to 2.7GHz) in one quality package

author: johnh
author_rank: Regular Contributor
timestamp: February 16, 2022, 07:46:48 am
content: I Knew that from watching some youtube video. But, sending to Australia is another matter

author: alpher
author_rank: Frequent Contributor
timestamp: February 17, 2022, 12:06:00 am
content: And here it is, CMU's signal gen. in action:https://youtu.be/lku9gqbGsgYCan somebody show me how to embed youtube here?Max range of the built in sig. gen.I actually never used the sig gen in CMU.allways used my SML01.

author: alpher
author_rank: Frequent Contributor
timestamp: February 17, 2022, 08:11:58 pm
content: Sold.

author: MarkL
author_rank: Unknown
timestamp: February 17, 2022, 10:59:31 pm
content: Sorry for the slightly off-topic post, but can you say what LED strips you used for the upgrade? Did you like the color rendering compared to the CCFL?

author: alpher
author_rank: Frequent Contributor
timestamp: February 18, 2022, 12:56:53 am
content: I like the display much better with the LEDs, it can be that the ccfls were allready dimmer that they should be?I don't remember the exact type, but it was something akin to this:https://www.ebay.ca/itm/124904756456They're rather cheap so buy a few with a different driver boards.You will have to cut them to the required lenght (you can cut every 3 leds)and modify the driver. Some are easier to modify than others so buy a few different ones, they all doable.In case of CMU if I remember right I had to change driver from buck to boost operation because of supply voltage.

author: Ice-Tea
author_rank: Super Contributor
timestamp: February 18, 2022, 12:08:54 pm
content: Supply voltage is indeed different from most LED replacementsIn case your CCFL failed: most of the time the fuse on the driver goes. Replacing it seems to work fine.