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Subject: Agilent Discussion Forums - We're moving to a new platform
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Date: Thu, September 1, 2011 3:47 pm
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----- Original Message -----
From: Kuba Ober
To: hp_agilent_equipment@...
Sent: Thursday, September 01, 2011 5:44 PM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter



That's "almost" what we want, but not exactly. It has a fixed
800x600 resolution, and it will look like crap on widescreen
monitors. For some reason everyone must be watching movies on
their monitors, because non-widescreen aspect ratios are disappearing.
I've recently been to a local Microcenter and the best deals were only
to be had on widescreen units with ridiculous resolutions (say 1600x1000).

I'm thinking of something that would be $100 in parts for a basic version,
optimized for use with real instruments not some imaginary specs someone
thought up.

This means:

1. Input channels with ranges that allow 1:1 connection to a selection of
popular instruments (here I need *YOUR* help!).

2. Screen colorization options -- again, based on behavior of real
instruments.

3. Use with available and "future-proof" monitors -- that means
analog VGA would be one option (solder a DAC), DVI another (solder
LVDS drivers).

I think that for spectrum analyzers it'd be cool to have an option
of double IF inputs and on-board frequency counting to generate
an accurate X position and on-screen display/cursors. Again: I need
input from *YOU* as all I have is a Tek 7L14 SA plugin. I would need
to know what are the output levels, frequency ranges, etc. on IF outputs
from various SAs.

Obviously the board would have room for various options (VGA output,
DVI output, USB output, IF input, etc) and they'd be populated as needed.
So a basic version may have USB interface and three 12 bit input channels with
10MHz bandwidth, and nothing else.

Since it smells like an FPGA-based solution, it's not unthinkable to have
an optional high-resolution (16 bits at 50+ MSps) channel to take video output
from SA's and do level measurement and filtering or even swept FFT. This would come
at a small incremental hardware cost, but obviously would be very useful.

Cheers, Kuba

On Sep 1, 2011, at 4:12 PM, W2HX wrote:

> Check out vectorVGA Tempest
>
>
> $179. However, some scaling input will be needed. I inquired to this company
> about using this for my 8566/68 specans. They have a product called the
> VectorVGA PRO which is $2000 and will do what we want out of the box.
> However, that's a lot of coin! I sent the XYZ specifications of my specan
> to them for comment on the applicability of the "tempest" version (which has
> nothing to do with electronic eavesdropping) and this is their response....

On Sep 1, 2011, at 10:43 AM, Peter Reilley wrote:

Perhaps another approach might be easier. Use a PC and an A/D
input device. You could create an application that read 2 analog
inputs and displayed them in an X/Y manner in a window. You would
not have to worry about screen resolution. The trick is finding
an A/D input device with at least 2 input channels. I was thinking
an audio input device but I don't think that they handle DC.

Pete.



----- Original Message -----
From: "Kuba Ober" <ober.14@...>
To: <hp_agilent_equipment@...>
Sent: Thursday, September 01, 2011 10:17 AM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter

Further thoughts: Now I think that the resolution will have to be
adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when
horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios,
so even if vertically
it's 768, horizontally it may need to be more than that. I think that the
device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly
analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory
bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a
display
draws some nomenclature, and then goes on to draw traces, it'd be good to
have a way
of setting it up to switch colors automatically on certain events (X,Y in
a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that
would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a
7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober

------------------------------------

Yahoo! Groups Links

------------------------------------

Yahoo! Groups Links

On Sep 1, 2011, at 4:03 PM, Christophe Huygens wrote:

Hi Bill,

I think this one of them. But I think there are others too:


Was this what you were looking for?

Xtof


On 01/09/11 21:32, Bill Ress wrote:

Hi Chris,

I must have missed the reference. I have cobbled up something for my
141T series but really need something much better. Could you send me the
reference link?

Thanks...Bill

On 9/1/2011 7:34 AM, Christophe Huygens wrote:

These are available, I think this was discussed before.

Xtof

On 01/09/11 16:08, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example,
if a display
draws some nomenclature, and then goes on to draw traces, it'd be good
to have a way
of setting it up to switch colors automatically on certain events (X,Y
in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs;
that would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is
a 7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober

Disclaimer:

------------------------------------

Yahoo! Groups Links

Disclaimer:


------------------------------------

Yahoo! Groups Links

On Sep 1, 2011, at 4:12 PM, W2HX wrote:

Check out vectorVGA Tempest


$179. However, some scaling input will be needed. I inquired to this company
about using this for my 8566/68 specans. They have a product called the
VectorVGA PRO which is $2000 and will do what we want out of the box.
However, that's a lot of coin! I sent the XYZ specifications of my specan
to them for comment on the applicability of the "tempest" version (which has
nothing to do with electronic eavesdropping) and this is their response....

On Sep 1, 2011, at 2:01 PM, Doug wrote:

DI-194RS

On Sep 1, 2011, at 10:34 AM, Christophe Huygens wrote:

These are available, I think this was discussed before.

Xtof

On 01/09/11 16:08, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example,
if a display
draws some nomenclature, and then goes on to draw traces, it'd be good
to have a way
of setting it up to switch colors automatically on certain events (X,Y
in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs;
that would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is
a 7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober

Disclaimer:

[Non-text portions of this message have been removed]

--- In hp_agilent_equipment@..., David Speck <Dave@...> wrote:

Looking over the list, I have noted that the majority of problems with
old equipment is failure of the electrolytic capacitors in the power
supplies over time.

I wonder if the veterans can offer any suggestions on their favorite
techniques for finding bad caps in circuit, especially those that have
not been so considerate to have blown their end caps off or otherwise
developed obvious physical failures.

I have a critical undocumented circuit board of relatively recent
construction with about 25 vertically mounted axial lead caps. It's
begun eating fuses at an increasing rate, and now, even a 2 amp fuse
blows instantly in a slot intended for a half amp fuse. No way to lift
one lead of the cap without pulling it out of the PCB, with the
attendant risk of ruining the irreplaceable board. (well, I could
replace it for another $6-7,000, but that's not in the budget this week!)

I figured I could put in another 2 amp fuse, and run it on a Variac at
reduced voltage while watching the current consumption, and see what
component heats up, but I really don't want to trash the microcomputer
on the board.

Any one have suggestions for any specific low voltage instruments for
in-circuit cap checking, or home-brew gimmicks that one can work up, to
give better information than the typical DVM and scope?

Thanks in advance,

Dave

-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Kuba Ober
Sent: Thursday, September 01, 2011 10:17 AM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter

Further thoughts: Now I think that the resolution will have to be adjustable
to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when
horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios, so
even if vertically
it's 768, horizontally it may need to be more than that. I think that the
device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly analog
inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory
bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to

VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a

display

draws some nomenclature, and then goes on to draw traces, it'd be good to

have a way

of setting it up to switch colors automatically on certain events (X,Y in

a certain

area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be

(upper limit),

each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display

accuracy would benefit

from taking some IF frequency/ies as the X coordinate instead of a

voltage. Counting frequency

is easy. For my 7L14 I was thinking of using both IFs as the inputs; that

would improve

the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a

7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come

first.

Cheers, Kuba Ober

------------------------------------

Yahoo! Groups Links

On 9/1/2011 7:34 AM, Christophe Huygens wrote:

These are available, I think this was discussed before.

Xtof

On 01/09/11 16:08, Kuba Ober wrote:
>
> I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
> VGA/USB converter for use with various instruments where existing X-Y
> displays are dying.
>
> I'm looking for input about the required specs and functionality:
>
> 1. Bandwidth
> 2. Input voltage ranges
> 3. Required accuracy on voltage-to-coordinate transformation
> 4. Requirements for sequence triggers to change colors: for example,
> if a display
> draws some nomenclature, and then goes on to draw traces, it'd be good
> to have a way
> of setting it up to switch colors automatically on certain events (X,Y
> in a certain
> area, retrace on X, etc).
> 5. Other inputs needed for interfacing with particular instruments
> 6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
> 7. Persistence adjustments: how many rectangular areas should there be
> (upper limit),
> each with its own persistence value.
>
> I'm also wondering if there are any spectrum analyzers where display
> accuracy would benefit
> from taking some IF frequency/ies as the X coordinate instead of a
> voltage. Counting frequency
> is easy. For my 7L14 I was thinking of using both IFs as the inputs;
> that would improve
> the accuracy of the display and would make it fixed-frequency.
>
> I don't have any HP SAs or other instruments like that, all I have is
> a 7L14 spec an.
>
> I'd try to make it as low cost as possible of course, but specs come
> first.
>
> Cheers, Kuba Ober
>
>

Disclaimer:

-----Original Message-----
From: gianfrancocanale <gf.canale@...>
To: hp_agilent_equipment <hp_agilent_equipment@...>
Sent: Thu, Sep 1, 2011 9:49 am
Subject: [hp_agilent_equipment] HP 343A V.H.F. noise source





Hi
I have found in a flee market the A.M. device.
Nice and with the the noise generator tube.
Now i want to build the power supply it.
The tube is not marked.
The HP catalogue says that the ENR is 5.2 dB
with a anode current of 3.1 mA.
Does anybody know the type of the tube used.
Thanks for the help
Gianfranco









[Non-text portions of this message have been removed]

On 01/09/2011 17:49, EB4APL wrote:

Pete,

You are right, but some guys had modified theirs easily for making DC
coupled low frequency software scopes and the results had been encouraging.
Since the internal A/D can handle DC, they removed the input blocking
capacitors and added a (dual) op-amp as level shiftter, accounting for
the A/D converters are biased to Vdd/2. A DC balance pot completes the
figure.

If someone is interested I think that I can find the web page with
detailed instructions.

Regards,
Ignacio


El 01/09/2011 16:43, PeterReilley escribi???:

Perhaps another approach might be easier. Use a PC and an A/D
input device. You could create an application that read 2 analog
inputs and displayed them in an X/Y manner in a window. You would
not have to worry about screen resolution. The trick is finding
an A/D input device with at least 2 input channels. I was thinking
an audio input device but I don't think that they handle DC.

Pete.



----- Original Message -----
From: "Kuba Ober"<ober.14@...>
To:<hp_agilent_equipment@...>
Sent: Thursday, September 01, 2011 10:17 AM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter

Further thoughts: Now I think that the resolution will have to be
adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when
horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios,
so even if vertically
it's 768, horizontally it may need to be more than that. I think that the
device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly
analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory
bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a
display
draws some nomenclature, and then goes on to draw traces, it'd be good to
have a way
of setting it up to switch colors automatically on certain events (X,Y in
a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that
would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a
7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober

------------------------------------

Yahoo! Groups Links

------------------------------------

Yahoo! Groups Links

------------------------------------

Yahoo! Groups Links