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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
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0xfede:
Update:

after a few mail with Keysight and a couple test the telnet bug is obviously still there and probably they wouldn't take care of.
I used Wireshark to demonstrate that the bug is on the server (DMM) side, data is corrupted before entering the client.
For anyone interested in remoting those multimeters don't use telnet but use socket instead.

After wasting some days trying figure out what's wrong I'm very disappointed by Keysight.

Regards,
0xfede



Kean:
This sounds like it is due to the way Telnet protocol is designed to handle certain binary data (OOB signalling, etc).
There are things you can negotiate in the protocol that could possibly get around this.  You'll need to read the appropriate RFC for more info, it has been nearly 20 years since I last implemented a telnet client and all the DO/DONT/WILL/WONT crap.
It could also be a limitation on the underlying telnet server implementation they've used, and I'm not surprised if they'd class this as a "wont fix" if there is a pretty simple workaround.
0xfede:
Hi Kean, when I first saw the problem I looked into RFC854 (telnet) to see if the client implementation was wrong.
The only special character that needs to be managed differentely is the IAC (0xFF). Since there is no such value in the stream (before corruption) there is no reason for data to get wild.
From RFC854 (https://tools.ietf.org/html/rfc854, page 14):
'....only the IAC need be doubled to be sent as data, and the other 255 codes may be passed transparently....'

I don't know what's wrong with their server implementations but if they are not interested in fixing this bug they should avoid citing telnet compatibility in the manual.

Best,
0xfede
exe:

--- Quote from: cellularmitosis on August 09, 2017, 10:28:07 pm ---Market segmentation is great and all, but be careful with creating artificial market segmentation when your primary market is engineers.  In addition to leaving a bad taste in their mouths, they tend to find a way to hack around it anyway.

--- End quote ---

I totally agree with you, but... Most equipment manufacturers target at corporate sector where it works a bit differently. Companies don't care about cost of equipment as long as it pays back.

PS I've seen people claiming "one repair justifies a new $500 soldering station" or "if you don't have a $5k+ scope then you are a bad engineer doing low-qualified work". I dunno how common is this, I'm just a hobbyist. But these guys are often selfish jerks scamming their customers. Or lucky bastards :)
lukier:

--- Quote from: exe on September 28, 2017, 02:12:05 pm ---I totally agree with you, but... Most equipment manufacturers target at corporate sector where it works a bit differently. Companies don't care about cost of equipment as long as it pays back.

--- End quote ---

And guess who makes the purchasing decisions in this corporate sector? Usually, the engineers recommend the equipment to the management to push it through the purchasing department. I might not be able to select a particular distributor, as corporate policies might limit that, I might not care about the cost (as much as I would do personally), but still, the equipment purchasing is not always a random process.

It might be different in the public sector (think university labs) where the contracts are won by the price alone and often there is no competent engineer in the loop. Hence the popularity of Tektronix in many labs.


--- Quote from: exe on September 28, 2017, 02:12:05 pm ---PS I've seen people claiming "one repair justifies a new $500 soldering station".

--- End quote ---
That is partially true, a lot of stuff gets thrown away if it is not under warranty because often there is nobody that could (legally!) do the repairs and make it economic (it doesn't make a sense for a senior engineer waste their time doing repairs).
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