AnsweredAssumed Answered

vrf (Offtopic) Mismatch error reduction due to attenuator pad calculator?

Question asked by VRFuser on Oct 2, 2006

Like • Show 0 Likes0
Comment • 3

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7650.21"><TITLE>XML</TITLE></HEAD><BODY>Hello folks:Does anybody have an example of an XML reader in vee (writing would be nice to but for now I just need to read an XML format file.Thanks in advance.ChuckVertu UK --- You are currently subscribed to vrf as: rsb@soco.agilent.com To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body. To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com". Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".</BODY></HTML>

No one else has this question

Outcomes

SteveE Sep 28, 2006 9:58 PM

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7650.28"><TITLE>(Offtopic) Mismatch error reduction due to attenuator pad calculator? </TITLE></HEAD><BODY>Does anyone know of anything or any way available to calculate the mismatch uncertainty improvement that you can get from using an attenuator pad? It is generally accepted that an attenuator pad with a good VSWR in front of a load with a poor VSWR will decrease the mismatch error, but I can't find anything that quantifies the improvement. Best I can find are broad statements like "a well matched attenuator pad with very low VSWR will virtually eliminate uncertainty due to mismatch". Hard to put that into a mathematical error analysis. Especially when "perfect" attenuators are so hard to find.

For example if you have a load with a 2:1 VSWR being driven from a source with a 1.5:1 VSWR the mismatch uncertainty is +0.56dB/ -0.6dB. What if I insert a "real world" 2dB pad with a 1.25:1 VSWR what the resultant mismatch uncertainty now be and how can I calculate it for various real world values?Thanks for any help,Steve --- You are currently subscribed to vrf as: rsb@soco.agilent.com To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body. To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com". Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".</BODY></HTML>

Actions

VRFuser Sep 29, 2006 12:59 PM

Does anyone know of anything or any way available to calculate the mismatch uncertainty improvement that you can get from using an attenuator pad? It is generally accepted that an attenuator pad with a good VSWR in front of a load with a poor VSWR will decrease the mismatch error, but I can't find anything that quantifies the improvement. Best I can find are broad statements like "a well matched attenuator pad with very low VSWR will virtually eliminate uncertainty due to mismatch". Hard to put that into a mathematical error analysis. Especially when "perfect" attenuators are so hard to find.

Â

For example if you have a load with a 2:1 VSWR being driven from a source with a 1.5:1 VSWR the mismatch uncertainty is +0.56dB/ -0.6dB. What if I insert a "real world"Â 2dB pad with a 1.25:1 VSWR what the resultant mismatch uncertainty now be and how can I calculate it for various real world values?

Thanks for any help,

Steve

---

To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body.
To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com".
To send messages to this mailing list, email "vrf@agilent.com".
If you need help with the mailing list send a message to
"owner-vrf@it.lists.it.agilent.com".
Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".

Actions

Dr_joel

Oct 2, 2006 9:26 AM

Does anyone know of a method or tool for measuring the size of a VEE program?
LabVIEW has a VI Metrics tool that counts Nodes, Diagrams, Controls, and Indicators.

I think I would like to count objects, wires, functions, user objects, and panels,
and scale or sum them to give a meaningful relative measure of code size.

(Maybe an enhancement for Shawn's ValidVEE program ?)

Our company is deploying metrics to measure the size and hours of past efforts,
and I would like to be able to measure the size of VEE programs, past and future.

Thanks,
Peter Fender
Test Engineering
Raytheon Company
St. Petersburg, FL
HYPERLINK "mailto:Peter_Fender@Raytheon.com"Peter_Fender@Raytheon.com
--- To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body. To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com". Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".

Actions

3 Replies

SteveE Sep 28, 2006 9:58 PM
Mark Correct
Correct Answer
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7650.28"><TITLE>(Offtopic) Mismatch error reduction due to attenuator pad calculator? </TITLE></HEAD><BODY>Does anyone know of anything or any way available to calculate the mismatch uncertainty improvement that you can get from using an attenuator pad? It is generally accepted that an attenuator pad with a good VSWR in front of a load with a poor VSWR will decrease the mismatch error, but I can't find anything that quantifies the improvement. Best I can find are broad statements like "a well matched attenuator pad with very low VSWR will virtually eliminate uncertainty due to mismatch". Hard to put that into a mathematical error analysis. Especially when "perfect" attenuators are so hard to find. For example if you have a load with a 2:1 VSWR being driven from a source with a 1.5:1 VSWR the mismatch uncertainty is +0.56dB/ -0.6dB. What if I insert a "real world" 2dB pad with a 1.25:1 VSWR what the resultant mismatch uncertainty now be and how can I calculate it for various real world values?Thanks for any help,Steve --- You are currently subscribed to vrf as: rsb@soco.agilent.com To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body. To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com". Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".</BODY></HTML>
Like • Show 0 Likes0
Actions
VRFuser Sep 29, 2006 12:59 PM
Mark Correct
Correct Answer
Does anyone know of anything or any way available to calculate the mismatch uncertainty improvement that you can get from using an attenuator pad? It is generally accepted that an attenuator pad with a good VSWR in front of a load with a poor VSWR will decrease the mismatch error, but I can't find anything that quantifies the improvement. Best I can find are broad statements like "a well matched attenuator pad with very low VSWR will virtually eliminate uncertainty due to mismatch". Hard to put that into a mathematical error analysis. Especially when "perfect" attenuators are so hard to find. Â

For example if you have a load with a 2:1 VSWR being driven from a source with a 1.5:1 VSWR the mismatch uncertainty is +0.56dB/ -0.6dB. What if I insert a "real world"Â 2dB pad with a 1.25:1 VSWR what the resultant mismatch uncertainty now be and how can I calculate it for various real world values?

Thanks for any help,

Steve

---

To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body.
To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com".
To send messages to this mailing list, email "vrf@agilent.com".
If you need help with the mailing list send a message to
"owner-vrf@it.lists.it.agilent.com".
Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".
Like • Show 0 Likes0
Actions
Dr_joel Oct 2, 2006 9:26 AM
Mark Correct
Correct Answer

Does anyone know of a method or tool for measuring the size of a VEE program?
LabVIEW has a VI Metrics tool that counts Nodes, Diagrams, Controls, and Indicators.

I think I would like to count objects, wires, functions, user objects, and panels,
and scale or sum them to give a meaningful relative measure of code size.

(Maybe an enhancement for Shawn's ValidVEE program ?)

Our company is deploying metrics to measure the size and hours of past efforts,
and I would like to be able to measure the size of VEE programs, past and future.

Thanks,
Peter Fender
Test Engineering
Raytheon Company
St. Petersburg, FL
HYPERLINK "mailto:Peter_Fender@Raytheon.com"Peter_Fender@Raytheon.com
--- To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body. To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com". Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".
Like • Show 0 Likes0
Actions

vrf (Offtopic) Mismatch error reduction due to attenuator pad calculator?

Outcomes

Related Content

Recommended Content