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vrf VEE Speed Question

Question asked by VRFuser on Dec 11, 2003

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>I am using polar display (Smith chart), but it seems that I cannot display 2 curves that have different magnitude and phase.
>I would like to display two curves as I do in X vs. Y graph, when I can see the name of the curve.
>I would like to know if smith chart has the same capability.
>It is very important to see the name of the curves on the graph.

From the Help for Polar Plot:
When more than one trace is to be plotted, each execution of the Polar Plot object uses the single angle input data with each trace's Radius input data, therefore, all traces share the single angle input.

So it seems it will not work to have curves with different angle scales. This is pretty inconvenient for Smith charting, so I will log an enhancement request.

I have made Smith charts in Matlab, though the code is kind of old. Let me know if you are interested.

--
Bill Ossmann
Philips Ultrasound
e-mail: bill.ossmann@philips.com

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VRFuser Dec 10, 2003 7:13 PM
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We would like our test equipment [under development] to be able to take
measurements every 0.5 msec.

Right now, our current Win98 PC, Pentium III, 550 MHz, 128 MB ram seems to
max out at measurements every 3 msec.

We measure thickness of 1/2" washers using a rotating bowl, shaft encoder,
laser, and A/D card.

I am writing to request estimates on speed improvements we can expect to see
by installing a faster PC.

I am wondering about CPU speed, memory for speed, XP for speed.

Dell catalog indicates...

Price         CPU [GHz]     Up to [GHz]     with Front Side Bus
$599     P4     2.4                      2.4          400 MHz
$999     P4     2.6          3.2          800
HyperThread
$1099     P4     2.8          3.2          800
HyperThread
$1249 Xeon     2.4          3.2          -               Dual
Processor Capable
$1399     Xeon     2.66          3.2          -               Dual
Processor Capable

Suggestions would be appreciated. Of course, we would like to get it right
the first time.

Regards,

Bill Brutzman, Manager IT
HK MetalCraft Mfg Corp
PO Box 775
35 Industrial Road
Lodi NJ 07644-0775

973.471.7770 x145 .voice
973.471.9666      .fax

BillB@hkMetalCraft.com
www.hkMetalCraft.com

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jay.johannes Dec 11, 2003 3:08 AM
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I am going to go out on a limb here and make a blanket statement that you
are not going to see the improvements you need simply by moving to a faster
processor.

The problem is not a simple one to answer as the exact numbers are tied up
in things like windows non-real time behaviour. This means that you cannot
guarantee when you will get access to your card, nor how long you will have
access before swapping out.

In order to meet your goals, I believe you need one of two changes. The
first would be to go with a data acq card that had enough reading buffer
that you could fill it at your data rate and then burst it out when you got
windows access. Something like a 10 reading memory should suffice.

The second possibility is to go with a real time operating system. This
would guarantee response in a particular time window. Assuming that the DAQ
card can read at this rate, it would solve the job. However, at this point
we are in the wrong group to be discussing this as VEE is not a real time
app.

Jay Nemeth-Johannes
Complete Test
720 SW 14th Street
Loveland, Colorado 80537

www.completetest.com
> -----Original Message-----
> From: Brutzman, Bill [mailto:BillB@hkMetalCraft.com]
> Sent: Thursday, December 11, 2003 9:14 AM
> To: VRF
> Cc: Gross, Jim; 'Marc@MeadowFace.net'; Osborn, Bob; Hopp, Raymond
> Subject: [vrf] VEE Speed Question
>
>
> We would like our test equipment [under development] to be able to take
> measurements every 0.5 msec.
>
> Right now, our current Win98 PC, Pentium III, 550 MHz, 128 MB ram seems to
> max out at measurements every 3 msec.
>
> We measure thickness of 1/2" washers using a rotating bowl, shaft encoder,
> laser, and A/D card.
>
> I am writing to request estimates on speed improvements we can expect to
> see
> by installing a faster PC.
>
> I am wondering about CPU speed, memory for speed, XP for speed.
>
> Dell catalog indicates...
>
>   Price         CPU [GHz]     Up to [GHz]     with Front Side Bus
>   $599     P4     2.4                      2.4          400 MHz
>   $999     P4     2.6          3.2          800
> HyperThread
>   $1099     P4     2.8          3.2          800
> HyperThread
>   $1249 Xeon     2.4          3.2          -               Dual
> Processor Capable
>   $1399     Xeon     2.66          3.2          -
Dual
> Processor Capable
>
> Suggestions would be appreciated. Of course, we would like to get it
> right
> the first time.
>
> Regards,
>
> Bill Brutzman, Manager IT
> HK MetalCraft Mfg Corp
> PO Box 775
> 35 Industrial Road
> Lodi NJ 07644-0775
>
> 973.471.7770 x145 .voice
> 973.471.9666      .fax
>
> BillB@hkMetalCraft.com
> www.hkMetalCraft.com
>
>
>
>
>
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> vrf@it.lists.it.agilent.com".

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VRFuser Dec 11, 2003 10:19 AM
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> The attached VEE program...

Awww now see? I messed it up again! In the Init formula box in Main, the
line:

dThisCount = QPF();

Should be:

dThisCount = QPC();

It doesn't make much difference, but it does throw the average off a little.
This Old Computer is running two hundredths of a ms. faster now.
-SHAWN-

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VRFuser Dec 11, 2003 10:38 AM
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> The attached VEE program...

Awww now see? I messed it up again! In the Init formula box in Main, the
line:

dThisCount = QPF();

Should be:

dThisCount = QPC();

It doesn't make much difference, but it does throw the average off a little.
This Old Computer is running two hundredths of a ms. faster now.
-SHAWN-

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lbill Dec 11, 2003 4:12 PM
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