Breaking News
Comments
Newest First | Oldest First | Threaded View
sharps_eng
User Rank
Author
re: HMI squeeze
sharps_eng   1/29/2012 9:56:06 AM
NO RATINGS
I recently used fibre on a hi-rel project (had a simple light/dark relay logoc link) and was surprised to find the latter receiver (Agilent 1402) singing at UHF when anywhere near its threshold (as with dirty fibre connections!). Too late now, but in retrospect the TX/RX pair needed a run-time check that sensed the high-low thresholds and reported a bad 'eye' margin. That would catch assembly and cabling errors. Couldn't add it because we only built one end of the link. Just patching a noise filter onto the RX wouldn't alert that a link had become weak. Next time: change the logic link to use a modulation protocol for link-confidence checking (and monitor errors on the Gig E links as well).

jlinstrom
User Rank
Author
re: HMI squeeze
jlinstrom   1/23/2012 10:28:47 PM
NO RATINGS
we were the HMI company - you'd think the System Integrator (who did drill rig build and program for a living) would know this - not their first fiber link. TG it was plastic fiber; ease up on the clinch and bits come thru the hose!

cdhmanning
User Rank
Author
re: HMI squeeze
cdhmanning   1/23/2012 5:48:03 PM
NO RATINGS
When you introduce unfamiliar technology into an industry then it is absolutely necessary to educate on its quirks and limitations. For example, boatyards are quite familiar with tying down cables and marine cables are designed to be very robust. If you give them something new that looks like a cable then expect them to treat it exactly the same.

an_m
User Rank
Author
re: HMI squeeze
an_m   1/21/2012 10:26:13 AM
NO RATINGS
anything that can go wrong will. had a high power coax, you know the sort of thing 5cm diameter. all went well for ages, till one day, full power and a bit was applied. system failed 'spectacularly' after a while. turned out 'pipe' had been flattened 'just a little' to get it through a gap. aparantly standard practice on ships for pipes, but the dialectric of the coax did not agree. moto. don't get high power rf 'pipes' installed in the ship yard by pipe fitters, even if they look and feel like pipes.

zeeglen
User Rank
Author
re: HMI squeeze
zeeglen   1/20/2012 11:03:34 PM
NO RATINGS
Good plan, William. Long ago I needed a drawing made for attaching a sheath for an optical fiber to the metal tube extending from a single-mode LED assembly. My initial sketch had the note "Do not use excessive force to attach the sheath." The drafting department laughed and said the note was not necessary. I was into the next project and did not need to waste time with an argument, so reluctantly I said they could eliminate that note. You can probably figure out what happened. About a year later, LEDs started failing in the field. The metal tubes had been bent by excessive force by the factory workers while attaching the sheath. After that I never let anyone tell me what or what not to put on my drawings.

WKetel
User Rank
Author
re: HMI squeeze
WKetel   1/20/2012 10:38:31 PM
NO RATINGS
It is amazing how poorly things can be made to work when the folks building things don't do it correctly. Sometimes they assume that the engineer was wrong and do it some other way, and then when it fails to work correctly the engineer gets the heat applied. So for one project I had all of the released drawings stamped "System will not function correctly unless built according to the drawing". I did get a few snide remarks, but when built to the drawing it worked as desired.



Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Radio
LATEST ARCHIVED BROADCAST

What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.

Brought to you by:

Like Us on Facebook
Special Video Section
The LTC2380-24 is a versatile 24-bit SAR ADC that combines ...
In this short video we show an LED light demo to ...
02:46
Wireless Power enables applications where it is difficult ...
07:41
LEDs are being used in current luxury model automotive ...
With design sizes expected to increase by 5X through 2020, ...
01:48
Linear Technology’s LT8330 and LT8331, two Low Quiescent ...
The quality and reliability of Mill-Max's two-piece ...
LED lighting is an important feature in today’s and future ...
05:27
The LT8602 has two high voltage buck regulators with an ...
05:18
Silego Technology’s highly versatile Mixed-signal GreenPAK ...
The quality and reliability of Mill-Max's two-piece ...
01:34
Why the multicopter? It has every thing in it. 58 of ...
Security is important in all parts of the IoT chain, ...
Infineon explains their philosophy and why the multicopter ...
The LTC4282 Hot SwapTM controller allows a board to be ...
This video highlights the Zynq® UltraScale+™ MPSoC, and sho...
Homeowners may soon be able to store the energy generated ...
The LTC®6363 is a low power, low noise, fully differential ...
See the Virtex® UltraScale+™ FPGA with 32.75G backplane ...
Vincent Ching, applications engineer at Avago Technologies, ...