> On 2013-04-17 22:05, Cydrome Leader wrote:
>> Jeroen Belleman <jeroen@nospam.please> wrote:
>>> On 2013-04-16 05:47, Robert Baer wrote:
>>>> Jeroen Belleman wrote:
>>>>> [...] We call them "wall current
>>>>> monitors". Here's a picture, if anyone is interested:
>>>>> <http://cern.ch/psring/psring/showpicture.php?section=03>
>>>>>
>>>>> Jeroen Belleman
>>>>>
>>>> Sadly, the link to the drawing fails.
>>>>
>>>
>>> Yes, I'm not very surprised. It's a php script putting out a
>>> TIFF picture. It has 'header("Content-type: image/tif");' as
>>> the first line producing output. That works fine for Mozilla-
>>> type browsers, but IE doesn't seem to understand it. So I put
>>> in a quick hack that makes it work in-house at least. Of course,
>>> you are outside.
>>>
>>> If you have a suggestion towards a good fix, I'm all ears.
>>>
>>> Jeroen Belleman
>>
>> it works in IE 9 for me, but you may need to force these headers
>>
>> Content-Type:
>> Coontent-Disposition:
>>
>> for the last one, you'll have to fiddle with forced download options and
>> set a file name, otherwise some browsers will think the file is just
>> file.php
>>
>> also, the behavior in browsers can differ if you click on a link or try to
>> save target as. Saving target as can cause problems.
>
> OK, thanks for the hints. It should work better now.
>
> Jeroen Belleman
No problem. it seems to "pass" some quick tests for making browers know
it's a tiff and a file.
Reply by Jeroen Belleman●April 18, 20132013-04-18
On 2013-04-17 22:05, Cydrome Leader wrote:
> Jeroen Belleman <jeroen@nospam.please> wrote:
>> On 2013-04-16 05:47, Robert Baer wrote:
>>> Jeroen Belleman wrote:
>>>> [...] We call them "wall current
>>>> monitors". Here's a picture, if anyone is interested:
>>>> <http://cern.ch/psring/psring/showpicture.php?section=03>
>>>>
>>>> Jeroen Belleman
>>>>
>>> Sadly, the link to the drawing fails.
>>>
>>
>> Yes, I'm not very surprised. It's a php script putting out a
>> TIFF picture. It has 'header("Content-type: image/tif");' as
>> the first line producing output. That works fine for Mozilla-
>> type browsers, but IE doesn't seem to understand it. So I put
>> in a quick hack that makes it work in-house at least. Of course,
>> you are outside.
>>
>> If you have a suggestion towards a good fix, I'm all ears.
>>
>> Jeroen Belleman
>
> it works in IE 9 for me, but you may need to force these headers
>
> Content-Type:
> Coontent-Disposition:
>
> for the last one, you'll have to fiddle with forced download options and
> set a file name, otherwise some browsers will think the file is just
> file.php
>
> also, the behavior in browsers can differ if you click on a link or try to
> save target as. Saving target as can cause problems.
OK, thanks for the hints. It should work better now.
Jeroen Belleman
Reply by Cydrome Leader●April 17, 20132013-04-17
Jeroen Belleman <jeroen@nospam.please> wrote:
> On 2013-04-16 05:47, Robert Baer wrote:
>> Jeroen Belleman wrote:
>>> [...] We call them "wall current
>>> monitors". Here's a picture, if anyone is interested:
>>> <http://cern.ch/psring/psring/showpicture.php?section=03>
>>>
>>> Jeroen Belleman
>>>
>> Sadly, the link to the drawing fails.
>>
>
> Yes, I'm not very surprised. It's a php script putting out a
> TIFF picture. It has 'header("Content-type: image/tif");' as
> the first line producing output. That works fine for Mozilla-
> type browsers, but IE doesn't seem to understand it. So I put
> in a quick hack that makes it work in-house at least. Of course,
> you are outside.
>
> If you have a suggestion towards a good fix, I'm all ears.
>
> Jeroen Belleman
it works in IE 9 for me, but you may need to force these headers
Content-Type:
Coontent-Disposition:
for the last one, you'll have to fiddle with forced download options and
set a file name, otherwise some browsers will think the file is just
file.php
also, the behavior in browsers can differ if you click on a link or try to
save target as. Saving target as can cause problems.
Reply by Cydrome Leader●April 17, 20132013-04-17
JW <none@dev.null> wrote:
> On Mon, 15 Apr 2013 19:37:00 -0700 josephkk <joseph_barrett@sbcglobal.net>
> wrote in Message id: <updpm8lf7r1n4ggle7hql9ot0nfkmmp6pd@4ax.com>:
>
>>On Mon, 15 Apr 2013 19:12:55 +0100, John Devereux <john@devereux.me.uk>
>>wrote:
>>
>>>Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>
>>>> John Devereux <john@devereux.me.uk> wrote:
>>>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>>>
>>>>>> John Devereux <john@devereux.me.uk> wrote:
>>>
>>>[...]
>>>
>>>>> The spectrum analyzer expects to plot to a plotter, so that plot was
>>>>> acquired over GPIB, then run through a HPGL to PNG filter. You can tweak
>>>>> options to get different resolution and colours / line thicknesses for
>>>>> the various elements of the plot.
>>>>
>>>> Have you used any GPIB to USB converters that function and didn't cost
>>>> $500?
>>>
>>>No, actually.
>>>
>>>> It seems silly to run out and buy a PCI card for this and be chained to
>>>> one desktop forever.
>>>
>>>Yes, I use a old SFF PC just for that, running a linux distribution. It
>>>does all the "GPIB stuff", has scripts to automate various
>>>"experiments". It's headless, just a box, but I can remote in to it of
>>>course. For the rare times I go "on the road" when I need GPIB I do have
>>>a NI USB interface, but it is not quite as reliable.
>>>
>>>The thing that causes most problems is handling a "screen dump" from the
>>>various instruments. I think they all want to be controlling a HP
>>>plotter then, instead of being controlled by a GPIB master. I never
>>>really got to the bottom of it, but I needed the PCI card to get it to
>>>work reliably.
>>
>>Personally i use the Prologix, LLC devices; nicely better price. Seem to
>>work just fine.
>>Back in the day i used to be a bit if a GPIB guru. Ask me by PM to
>>discuss the instrument to plotter things. We may need to trick the
>>interface a bit to read the control words that activate the plotter.
>>However they are usually settable in the instrument GPIB menus. Some
>>configurations do not need the control words (promiscuous transmit and
>>receive).
>
> I've heard good things about this adapter that is alleged to be 100%
> compatible with Agilent's controller. And the price can't be beat.
>
> http://bmjd.biz/
At $80 shipped, it might be worth the gamble.
Reply by mike●April 16, 20132013-04-16
On 4/16/2013 7:09 AM, Phil Hobbs wrote:
> On 04/16/2013 05:03 AM, JW wrote:
>> On Mon, 15 Apr 2013 19:37:00 -0700 josephkk
>> <joseph_barrett@sbcglobal.net>
>> wrote in Message id: <updpm8lf7r1n4ggle7hql9ot0nfkmmp6pd@4ax.com>:
>>
>>> On Mon, 15 Apr 2013 19:12:55 +0100, John Devereux <john@devereux.me.uk>
>>> wrote:
>>>
>>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>>
>>>>> John Devereux <john@devereux.me.uk> wrote:
>>>>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>>>>
>>>>>>> John Devereux <john@devereux.me.uk> wrote:
>>>>
>>>> [...]
>>>>
>>>>>> The spectrum analyzer expects to plot to a plotter, so that plot was
>>>>>> acquired over GPIB, then run through a HPGL to PNG filter. You can
>>>>>> tweak
>>>>>> options to get different resolution and colours / line thicknesses
>>>>>> for
>>>>>> the various elements of the plot.
>>>>>
>>>>> Have you used any GPIB to USB converters that function and didn't cost
>>>>> $500?
>>>>
>>>> No, actually.
>>>>
>>>>> It seems silly to run out and buy a PCI card for this and be
>>>>> chained to
>>>>> one desktop forever.
>>>>
>>>> Yes, I use a old SFF PC just for that, running a linux distribution. It
>>>> does all the "GPIB stuff", has scripts to automate various
>>>> "experiments". It's headless, just a box, but I can remote in to it of
>>>> course. For the rare times I go "on the road" when I need GPIB I do
>>>> have
>>>> a NI USB interface, but it is not quite as reliable.
>>>>
>>>> The thing that causes most problems is handling a "screen dump" from
>>>> the
>>>> various instruments. I think they all want to be controlling a HP
>>>> plotter then, instead of being controlled by a GPIB master. I never
>>>> really got to the bottom of it, but I needed the PCI card to get it to
>>>> work reliably.
>>>
>>> Personally i use the Prologix, LLC devices; nicely better price. Seem to
>>> work just fine.
>>> Back in the day i used to be a bit if a GPIB guru. Ask me by PM to
>>> discuss the instrument to plotter things. We may need to trick the
>>> interface a bit to read the control words that activate the plotter.
>>> However they are usually settable in the instrument GPIB menus. Some
>>> configurations do not need the control words (promiscuous transmit and
>>> receive).
>>
>> I've heard good things about this adapter that is alleged to be 100%
>> compatible with Agilent's controller. And the price can't be beat.
>>
>> http://bmjd.biz/
>>
>
> I use a Prologix GPIB-Ethernet, connected to a wireless bridge on top of
> my rack full of boat anchors. Works great, no cables to worry about,
> just turn it on and forget about it.
>
> Cheers
>
> Phil Hobbs
>
GPIB is exceedingly complex.
BUT
If you have a modern instrument that's programmed in ASCII, it takes
zero understanding
of the protocol.
A PIC processor can easily copy ASCII between RS-232 and GPIB.
And you can plug on a RS-232 to USB or Bluetooth adapter and get
anywhere you want.
Doesn't meet ANY standards. Doesn't look pretty. It ain't fast.
But it's cheap, it works and one chip fits in a gender-changer dongle.
Reply by Phil Hobbs●April 16, 20132013-04-16
On 04/16/2013 05:03 AM, JW wrote:
> On Mon, 15 Apr 2013 19:37:00 -0700 josephkk <joseph_barrett@sbcglobal.net>
> wrote in Message id: <updpm8lf7r1n4ggle7hql9ot0nfkmmp6pd@4ax.com>:
>
>> On Mon, 15 Apr 2013 19:12:55 +0100, John Devereux <john@devereux.me.uk>
>> wrote:
>>
>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>
>>>> John Devereux <john@devereux.me.uk> wrote:
>>>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>>>
>>>>>> John Devereux <john@devereux.me.uk> wrote:
>>>
>>> [...]
>>>
>>>>> The spectrum analyzer expects to plot to a plotter, so that plot was
>>>>> acquired over GPIB, then run through a HPGL to PNG filter. You can tweak
>>>>> options to get different resolution and colours / line thicknesses for
>>>>> the various elements of the plot.
>>>>
>>>> Have you used any GPIB to USB converters that function and didn't cost
>>>> $500?
>>>
>>> No, actually.
>>>
>>>> It seems silly to run out and buy a PCI card for this and be chained to
>>>> one desktop forever.
>>>
>>> Yes, I use a old SFF PC just for that, running a linux distribution. It
>>> does all the "GPIB stuff", has scripts to automate various
>>> "experiments". It's headless, just a box, but I can remote in to it of
>>> course. For the rare times I go "on the road" when I need GPIB I do have
>>> a NI USB interface, but it is not quite as reliable.
>>>
>>> The thing that causes most problems is handling a "screen dump" from the
>>> various instruments. I think they all want to be controlling a HP
>>> plotter then, instead of being controlled by a GPIB master. I never
>>> really got to the bottom of it, but I needed the PCI card to get it to
>>> work reliably.
>>
>> Personally i use the Prologix, LLC devices; nicely better price. Seem to
>> work just fine.
>> Back in the day i used to be a bit if a GPIB guru. Ask me by PM to
>> discuss the instrument to plotter things. We may need to trick the
>> interface a bit to read the control words that activate the plotter.
>> However they are usually settable in the instrument GPIB menus. Some
>> configurations do not need the control words (promiscuous transmit and
>> receive).
>
> I've heard good things about this adapter that is alleged to be 100%
> compatible with Agilent's controller. And the price can't be beat.
>
> http://bmjd.biz/
>
I use a Prologix GPIB-Ethernet, connected to a wireless bridge on top of
my rack full of boat anchors. Works great, no cables to worry about,
just turn it on and forget about it.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
Reply by JW●April 16, 20132013-04-16
On Mon, 15 Apr 2013 19:37:00 -0700 josephkk <joseph_barrett@sbcglobal.net>
wrote in Message id: <updpm8lf7r1n4ggle7hql9ot0nfkmmp6pd@4ax.com>:
>On Mon, 15 Apr 2013 19:12:55 +0100, John Devereux <john@devereux.me.uk>
>wrote:
>
>>Cydrome Leader <presence@MUNGEpanix.com> writes:
>>
>>> John Devereux <john@devereux.me.uk> wrote:
>>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>>
>>>>> John Devereux <john@devereux.me.uk> wrote:
>>
>>[...]
>>
>>>> The spectrum analyzer expects to plot to a plotter, so that plot was
>>>> acquired over GPIB, then run through a HPGL to PNG filter. You can tweak
>>>> options to get different resolution and colours / line thicknesses for
>>>> the various elements of the plot.
>>>
>>> Have you used any GPIB to USB converters that function and didn't cost
>>> $500?
>>
>>No, actually.
>>
>>> It seems silly to run out and buy a PCI card for this and be chained to
>>> one desktop forever.
>>
>>Yes, I use a old SFF PC just for that, running a linux distribution. It
>>does all the "GPIB stuff", has scripts to automate various
>>"experiments". It's headless, just a box, but I can remote in to it of
>>course. For the rare times I go "on the road" when I need GPIB I do have
>>a NI USB interface, but it is not quite as reliable.
>>
>>The thing that causes most problems is handling a "screen dump" from the
>>various instruments. I think they all want to be controlling a HP
>>plotter then, instead of being controlled by a GPIB master. I never
>>really got to the bottom of it, but I needed the PCI card to get it to
>>work reliably.
>
>Personally i use the Prologix, LLC devices; nicely better price. Seem to
>work just fine.
>Back in the day i used to be a bit if a GPIB guru. Ask me by PM to
>discuss the instrument to plotter things. We may need to trick the
>interface a bit to read the control words that activate the plotter.
>However they are usually settable in the instrument GPIB menus. Some
>configurations do not need the control words (promiscuous transmit and
>receive).
I've heard good things about this adapter that is alleged to be 100%
compatible with Agilent's controller. And the price can't be beat.
http://bmjd.biz/
Reply by John Devereux●April 16, 20132013-04-16
josephkk <joseph_barrett@sbcglobal.net> writes:
> On Mon, 15 Apr 2013 19:12:55 +0100, John Devereux <john@devereux.me.uk>
> wrote:
>
>>Cydrome Leader <presence@MUNGEpanix.com> writes:
>>
>>> John Devereux <john@devereux.me.uk> wrote:
>>>> Cydrome Leader <presence@MUNGEpanix.com> writes:
>>>>
>>>>> John Devereux <john@devereux.me.uk> wrote:
>>
>>[...]
>>
>>>> The spectrum analyzer expects to plot to a plotter, so that plot was
>>>> acquired over GPIB, then run through a HPGL to PNG filter. You can tweak
>>>> options to get different resolution and colours / line thicknesses for
>>>> the various elements of the plot.
>>>
>>> Have you used any GPIB to USB converters that function and didn't cost
>>> $500?
>>
>>No, actually.
>>
>>> It seems silly to run out and buy a PCI card for this and be chained to
>>> one desktop forever.
>>
>>Yes, I use a old SFF PC just for that, running a linux distribution. It
>>does all the "GPIB stuff", has scripts to automate various
>>"experiments". It's headless, just a box, but I can remote in to it of
>>course. For the rare times I go "on the road" when I need GPIB I do have
>>a NI USB interface, but it is not quite as reliable.
>>
>>The thing that causes most problems is handling a "screen dump" from the
>>various instruments. I think they all want to be controlling a HP
>>plotter then, instead of being controlled by a GPIB master. I never
>>really got to the bottom of it, but I needed the PCI card to get it to
>>work reliably.
>
> Personally i use the Prologix, LLC devices; nicely better price. Seem to
> work just fine.
I have used that too, worked fine for simple things, but ISTR it seemed
to get lost when doing sequences of commands.
Or I did.
> Back in the day i used to be a bit if a GPIB guru. Ask me by PM to
> discuss the instrument to plotter things. We may need to trick the
> interface a bit to read the control words that activate the plotter.
> However they are usually settable in the instrument GPIB menus. Some
> configurations do not need the control words (promiscuous transmit and
> receive).
Thanks Joseph that is a generous offer :) I would love to take you up on
it sometime but I am up to my neck in other projects at the moment,
would not be able to do it justice!
Thanks,
--
John Devereux
Reply by Jeroen Belleman●April 16, 20132013-04-16
On 2013-04-16 05:47, Robert Baer wrote:
> Jeroen Belleman wrote:
>> [...] We call them "wall current
>> monitors". Here's a picture, if anyone is interested:
>> <http://cern.ch/psring/psring/showpicture.php?section=03>
>>
>> Jeroen Belleman
>>
> Sadly, the link to the drawing fails.
>
Yes, I'm not very surprised. It's a php script putting out a
TIFF picture. It has 'header("Content-type: image/tif");' as
the first line producing output. That works fine for Mozilla-
type browsers, but IE doesn't seem to understand it. So I put
in a quick hack that makes it work in-house at least. Of course,
you are outside.
If you have a suggestion towards a good fix, I'm all ears.
Jeroen Belleman
Reply by Robert Baer●April 15, 20132013-04-15
Jeroen Belleman wrote:
> On 2013-04-10 22:44, John Devereux wrote:
>>
>> Hi,
>>
>> Since it seems a useful thing to have, I am making a wideband current
>> probe, ~10-1000MHz, like one of these:
>>
>> <http://www.interferencetechnology.com/wp-content/uploads/2012/03/Figure42.jpg>
>>
>>
>> Every home should have one. It's from the article:
>
> To get a response curve that makes sense for an RF current transformer,
> you have to be able to excite it with a known current. The usual way
> to do so is by inserting the transformer into a suitably sized
> and carefully terminated coaxial transmission line. The line's
> characteristic impedance ensures that the current is flat over
> frequency (to within a few dB or so). The 'suitable size' bit is
> to make sure that the insertion of the transformer does not make
> a discontinuity in its impedance. I check this through reflectometry:
> The line with the transformer in place should look like a smooth
> transmission line all the way through.
>
> That's the way I test beam current transformers here. In its final
> application, the primary is not a wire; It's a particle beam. I get
> bandwidths of about 3GHz. OK, my kit is upwards of 35k$ a piece.
> Then again, it's all custom made, has to hold a vacuum too, be
> radiation resistant, etc. That has a way of driving up the cost...
> (Just the ferrite cores are 1k$ a piece, and I use five.)
>
> Come to think of it, the thing is warped such that many wouldn't
> even recognize it as a transformer. We call them "wall current
> monitors". Here's a picture, if anyone is interested:
> <http://cern.ch/psring/psring/showpicture.php?section=03>
>
> Jeroen Belleman
>