Hi All
Thanks for the responses it helps.
As far as I can tell 91888-1 and 91889-1 are identical to 91888-2 and 91889-2
Regards
Andy
Andrew Price
Prinicpal Environmental Engineer (EMC)
Land & Naval Defence Electronics Division
Selex ES Ltd
Sigma House, Christopher Martin Rd, Basildon SS14 3EL
The cable vendors are now hyping the presence of oxygen. Now you can read about
the "benefits" of air-foamed polyethylene. It's interesting to see what else
cable vendors find for their ad copy.
http://www.audioquest.com/hdmi/diamond
Amazon currently sells this HDMI cable for the low price of $1
Date sent: Wed, 2 Mar 2016 15:55:06 -0800
Send reply to: ri...@ieee.org
> I've used a 5-sided cube inside the chamber to create a
> draft-free environment for performing flammability tests.
> Rich
This technique works well for heating tests on lab
benches as well and quick
On 3/2/2016 8:02 PM, Brent DeWitt wrote:
I haven't looked at the SI characteristics, but the standard clearly doesn't
address EMC concerns and the performance of the cables in radiated emission
shows it. YMMV
Hi Brent,
I hope none of the vendors start hyping oxygen free cable. (grin)
Cortla
There has been a recent marketing blitz for "certified" HDMI cables. THX has
started a certification program and Kordz is one company that proudly
advertises _very_ expensive cables for high video resolutions. I haven't
looked at the SI characteristics, but the standard clearly doesn't address
I've used a 5-sided cube inside the chamber to create a draft-free environment
for performing flammability tests. The open side faces the front so you can
see the equipment. The test flame is quite still. I would believe this would
also work for temperature measurements.
Rich
> -Or
A quick trip in the "Way Back" machine brings me back to the early PC days. To
get parallel printers to pass the FCC class B requirements we had to use a very
expensive cable purchased directly from IBM which had double shielded cable and
heavy metal back shells. The cost was something like $50
Scott, et al,
From your comment & Brian's analysis, which makes sense, you should
now add a test corner (as best you can fit one in) inside the temperature
chamber to copy the conditions that are normally used outside the chamber.
Then the results obtained are the proper, comparable result
Alternatively, assuming the typical wire rack shelving in the chamber and
a relatively small EUT, free air flow can be limited by placing three wire
rack shelves onto adjacent levels that are out of the main air circulation
pattern in the chamber and placing pieces of cardboard or corrugated
fiberb
On 3/2/2016 11:54 AM, IBM Ken wrote:
perhaps you could enclose the whole cable in a tubular copper braid
(or mylar-foil tape) and try to solder to the shield of the DVI connectors
Around 1987, my late brother, who was a free-lance C-language
consultant, bought an extremely high resolution 27 i
Brian,
Also noted many differences in cables
In our case, we first made sure all signal pins on the board were filtered.
We grounded all unused pins on the board side.
If that did not help we removed unused pins from the cable.
Sincerely,
Dieter Paasche
Advanced Product Developer, Elect
Scott;
Since I am not sure about what, exactly, you are testing, I'll just make a
couple of 'open' comments.
If you need a surface temperature of 40ºC on your DUT, then you should use a
fan, inside your temp chamber, to achieve, as much as possible, an isothermal
environment, which will, in th
Similarly (probably obvious), if the external temperature is higher than the
EUT, when the air is stagnant, you end up with a layer of cooler air around the
EUT. Increasing the flow of (hotter) air will remove this layer of cooler air
and raise the external temperature.
-Elliott
-Original
Ken,
Many years back we made a huge error by using USB interface to operate some
light industrial equipment. We had all kinds of EMC issues because of the poor
shield in the cable and face it; USB just isn’t designed for that environment.
We ran tubular copper/tin braid over the entire USB cabl
Hi, I have the numbers for the 91888-2 S/N 101 and 91889-2 S/N 101 if that
helps.
91888-2 at 1 meter
Freq ACFGain Num gain
1000 20.39.9 9.68
1500 20.513.221.05
2000 21.514.829.86
91888-2 at 3 meter
Freq
Brian,
One thing I started doing here at the lab was purchasing cables with
"clear" jackets on them and calling out a braided shield, mainly for
USB, Firewire and such, but I wonder if that would be an option for the
DVI cables you are looking for. In my experience, the clear jacketed
cables come
Brian,
I feel your pain and share Rodney's opinions on HDMI cables which are my man
bugbear. Depending on how many you purchase a year or at a time you may well
find some cable companies willing to work with you.
James
-Original Message-
From: Kunde, Brian [mailto:brian_ku...@lecotc.co
Hi Brian; Maybe this is a dumb idea, but perhaps you could enclose the
whole cable in a tubular copper braid (or mylar-foil tape) and try to
solder to the shield of the DVI connectors? Or, if you are cutting away
the overmold anyway, solder the braid to the backshell. It would be a
little delicat
And HDMI is not any better. The narrow minded committees which come up with
interface standards MUST also look at the physical level and require some sort
of mechanical/electrical specification for cables to support the interfaces
they define. Without a good cable the interface whether it be DV
We are in need of a reasonably priced source for quality and reliable video
cables; specifically a Single Link DVI Male to Male in a variety of lengths. In
one application we would prefer one end of the cable to be a right angle.
We have received and tested numerous over the counter DVI cables;
All,
The idea that "moving air is cooling air” is incorrect. This is only true if
there is a temperature difference between the airstream and the hot object. If
the the air stream and the object are at the same temperature, no cooling will
occur. If the airstream is hotter than the object, then
Brian,
I also suspect the forced air circulation may help the heat dissipation. This
variation will affect the result. When we conduct temperature rise at room
temperature, we will place the sample inside the test corner and block the
airflow directly from the top to the sample. It seems whe
How windy is it inside your chamber? Ours has large fans to circulate the air.
Air moving across the surface of your EUT will pull the heat out lowing the
external measurements. I really don't know how to get around this other than to
turn off the fans to let the air go stagnant around the EUT.
We would like to verify the temperature rise at 40 degC ambient temperature.
The sample under test was placed in a temperature chamber set at 40 degC. The
internal temperatures were close but the external temperatures were marked
different and even lower than the room temperature without using
Fine and valuable responses. Thank you.
Can anyone respond to my question?
> Has anyone else encountered this sort of requirement? The CBTL
either
> could not or would not provide a written requirement, so this
smells off.
Peter Tarver
Date sent: Fri, 26 Feb 2016 14:59:02 -080
Hi All
Can anyone provide me with the gain figures for Ailtech/Stoddard Horn Antennas
91888-1 and 91889-1.
Thanks
Andy
Andrew Price
Prinicpal Environmental Engineer (EMC)
Land & Naval Defence Electronics Division
Selex ES Ltd
Sigma House, Christopher Martin Rd, Basildon SS14 3EL, UK
* Tel
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