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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Just got done removing Port 2 Coupler and placing it in the Port 1 Position. Problem follows, so I think this is kind of pointing towards the switch. I can say for sure the source is providing the correct power at 3.0 GHz. Whatever it's producing above 3 GHz I can say for sure, but it is stable. No erratic behavior when switching between the ports.? Bit of a tricky fault..? Rich?
On Saturday, March 5, 2022, 09:24:07 PM EST, Rich Miller via groups.io <av8torrich@...> wrote:
I was not able to take those measurements prior to pulling it apart.. What I can state is; S22 was rock solid with no such fluctuations, and passes all test without issue. Furthermore, S22 never fluctuates when moving to another measurement and back again. When I did power up the 8753E, the S11 response is normal, and remains normal until such time as I switch between another measurement. As a matter of fact, simply hitting S11 multiple times will straighten the response out, and also cause the response to go nutty. In short, if I cycle S11 multiple times I can either get a normal RL response, or something similar to what I showed in my original post. What I am attempting now, is swapping Port 1 with Port 2, and see if the problem follows. I have it down in my lab in the basement where I do have a small ESD work area near where I solder. Good news is, we are at >70% humidity here in the mid Atlantic today so that should help eliminate some of the ESD Risk. 73 Rich, AJ3G
On Saturday, March 5, 2022, 09:11:18 PM EST, n8zmTWH@... <n8zmtwh@...> wrote:
¸é¾±³¦³ó¡ ? From your picture, the problem is above 3 GHz. The Source oscillator does a major band switch at about 3 GHz, which suggests that might be where the problem is. The SS switch ¡®could¡¯ be erratic, but it just doesn¡¯t seem likely, especially since you are not seeing any power level changes. ? When you power up and just let it run for a while without changing anything, does it stay good? ? If you put a through between ports 1 and 2, and look at S21and S12, what happens? ? Also, does S22 behave properly? From your original post, I believe it must be OK, but I¡¯m double checking that conclusion. ? One caution about cables. They can build up static charge between the center and outer, which dumps into the ports when? connected. Usually only a concern with long cables, but¡ ? From: [email protected] <[email protected]> On Behalf Of Rich Miller via groups.io
Sent: Saturday, March 05, 2022 8:21 PM To: [email protected]; [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? I just got done measuring the power out at Port 1. To my surprise, I cannot detect any significant power output fulgurations. I have tried 3GHz, 3.707GHz (worse offender in S11 Response), 4GHz and 5GHz.? They all look very stable, when switching back and forth. I am using a power meter which is not rated for accuracy at 3 - 6 GHz, but I can set the output to 0dBm look at the measurement, and switch back and forth and look for any relative change. It is not fluctuating whatsoever.? ? I also checked 3GHz with my MDO, and that is a accurate power measurement. Now I am scratching my head again.
? On Saturday, March 5, 2022, 07:16:43 PM EST, Lothar baier <lothar@...> wrote: ? ? Try to find a cheap working 85047A ,? it uses the same inerts as the 8753D/E/ES including the solid state switch and you get 2 couplers as added bonus . ? Take one word of caution though ,? when handling the switch use a ESD mat and wriststrap or at least put some esd caps or terminations on the SMA connectors ,? those suckers are really sensitive to ESD ? Sent from for Windows ? From: [email protected] <[email protected]> on behalf of Rich Miller via groups.io <av8torrich@...> ? Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose. ? Looks like the parts hunt is likely on! ? Rich ? On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote: ? ? The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From: Rich Miller via groups.io ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From: Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ? ? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
I was not able to take those measurements prior to pulling it apart.. What I can state is; S22 was rock solid with no such fluctuations, and passes all test without issue. Furthermore, S22 never fluctuates when moving to another measurement and back again. When I did power up the 8753E, the S11 response is normal, and remains normal until such time as I switch between another measurement. As a matter of fact, simply hitting S11 multiple times will straighten the response out, and also cause the response to go nutty. In short, if I cycle S11 multiple times I can either get a normal RL response, or something similar to what I showed in my original post. What I am attempting now, is swapping Port 1 with Port 2, and see if the problem follows. I have it down in my lab in the basement where I do have a small ESD work area near where I solder. Good news is, we are at >70% humidity here in the mid Atlantic today so that should help eliminate some of the ESD Risk. 73 Rich, AJ3G
On Saturday, March 5, 2022, 09:11:18 PM EST, n8zmTWH@... <n8zmtwh@...> wrote:
¸é¾±³¦³ó¡ ? From your picture, the problem is above 3 GHz. The Source oscillator does a major band switch at about 3 GHz, which suggests that might be where the problem is. The SS switch ¡®could¡¯ be erratic, but it just doesn¡¯t seem likely, especially since you are not seeing any power level changes. ? When you power up and just let it run for a while without changing anything, does it stay good? ? If you put a through between ports 1 and 2, and look at S21and S12, what happens? ? Also, does S22 behave properly? From your original post, I believe it must be OK, but I¡¯m double checking that conclusion. ? One caution about cables. They can build up static charge between the center and outer, which dumps into the ports when? connected. Usually only a concern with long cables, but¡ ? From: [email protected] <[email protected]> On Behalf Of Rich Miller via groups.io
Sent: Saturday, March 05, 2022 8:21 PM To: [email protected]; [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? I just got done measuring the power out at Port 1. To my surprise, I cannot detect any significant power output fulgurations. I have tried 3GHz, 3.707GHz (worse offender in S11 Response), 4GHz and 5GHz.? They all look very stable, when switching back and forth. I am using a power meter which is not rated for accuracy at 3 - 6 GHz, but I can set the output to 0dBm look at the measurement, and switch back and forth and look for any relative change. It is not fluctuating whatsoever.? ? I also checked 3GHz with my MDO, and that is a accurate power measurement. Now I am scratching my head again.
? On Saturday, March 5, 2022, 07:16:43 PM EST, Lothar baier <lothar@...> wrote: ? ? Try to find a cheap working 85047A ,? it uses the same inerts as the 8753D/E/ES including the solid state switch and you get 2 couplers as added bonus . ? Take one word of caution though ,? when handling the switch use a ESD mat and wriststrap or at least put some esd caps or terminations on the SMA connectors ,? those suckers are really sensitive to ESD ? Sent from for Windows ? From: [email protected] <[email protected]> on behalf of Rich Miller via groups.io <av8torrich@...> ? Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose. ? Looks like the parts hunt is likely on! ? Rich ? On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote: ? ? The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From: Rich Miller via groups.io ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From: Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ? ? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
¿ªÔÆÌåÓý¸é¾±³¦³ó¡ ? From your picture, the problem is above 3 GHz. The Source oscillator does a major band switch at about 3 GHz, which suggests that might be where the problem is. The SS switch ¡®could¡¯ be erratic, but it just doesn¡¯t seem likely, especially since you are not seeing any power level changes. ? When you power up and just let it run for a while without changing anything, does it stay good? ? If you put a through between ports 1 and 2, and look at S21and S12, what happens? ? Also, does S22 behave properly? From your original post, I believe it must be OK, but I¡¯m double checking that conclusion. ? One caution about cables. They can build up static charge between the center and outer, which dumps into the ports when? connected. Usually only a concern with long cables, but¡ ? From: [email protected] <[email protected]> On Behalf Of Rich Miller via groups.io
Sent: Saturday, March 05, 2022 8:21 PM To: [email protected]; [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? I just got done measuring the power out at Port 1. To my surprise, I cannot detect any significant power output fulgurations. I have tried 3GHz, 3.707GHz (worse offender in S11 Response), 4GHz and 5GHz.? They all look very stable, when switching back and forth. I am using a power meter which is not rated for accuracy at 3 - 6 GHz, but I can set the output to 0dBm look at the measurement, and switch back and forth and look for any relative change. It is not fluctuating whatsoever.? ? I also checked 3GHz with my MDO, and that is a accurate power measurement. Now I am scratching my head again.
? On Saturday, March 5, 2022, 07:16:43 PM EST, Lothar baier <lothar@...> wrote: ? ? Try to find a cheap working 85047A ,? it uses the same inerts as the 8753D/E/ES including the solid state switch and you get 2 couplers as added bonus . ? Take one word of caution though ,? when handling the switch use a ESD mat and wriststrap or at least put some esd caps or terminations on the SMA connectors ,? those suckers are really sensitive to ESD ? Sent from for Windows ? From: [email protected] <[email protected]> on behalf of Rich Miller via groups.io <av8torrich@...> ? Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose. ? Looks like the parts hunt is likely on! ? Rich ? On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote: ? ? The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From: Rich Miller via groups.io ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From: Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ? ? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
I just got done measuring the power out at Port 1. To my surprise, I cannot detect any significant power output fulgurations. I have tried 3GHz, 3.707GHz (worse offender in S11 Response), 4GHz and 5GHz.? They all look very stable, when switching back and forth. I am using a power meter which is not rated for accuracy at 3 - 6 GHz, but I can set the output to 0dBm look at the measurement, and switch back and forth and look for any relative change. It is not fluctuating whatsoever.? I also checked 3GHz with my MDO, and that is a accurate power measurement. Now I am scratching my head again. Rich
On Saturday, March 5, 2022, 07:16:43 PM EST, Lothar baier <lothar@...> wrote:
Try to find a cheap working 85047A ,? it uses the same inerts as the 8753D/E/ES including the solid state switch and you get 2 couplers as added bonus . ? Take one word of caution though ,? when handling the switch use a ESD mat and wriststrap or at least put some esd caps or terminations on the SMA connectors ,? those suckers are really sensitive to ESD ? Sent from for Windows ? From: [email protected] <[email protected]> on behalf of Rich Miller via groups.io <av8torrich@...>
Sent: Saturday, March 5, 2022 6:02:40 PM To: [email protected] <[email protected]>; [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ?
Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W
Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose.
Looks like the parts hunt is likely on!
Rich
On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote:
The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From:
Rich Miller via groups.io ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From:
Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ?
? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Yes, when I get into the switch, I will either take it to my work's clean room or one of our ESD benches. Some CW Measurements forthcoming. I forgot that I have my Millivac RF Millivolt meter downstairs. Need to look at the derating curves for this frequency, but it should be able to give me a good relative reading on a sudden loss of power up at 4 - 6 GHz. Rich
On Saturday, March 5, 2022, 07:16:43 PM EST, Lothar baier <lothar@...> wrote:
Try to find a cheap working 85047A ,? it uses the same inerts as the 8753D/E/ES including the solid state switch and you get 2 couplers as added bonus . ? Take one word of caution though ,? when handling the switch use a ESD mat and wriststrap or at least put some esd caps or terminations on the SMA connectors ,? those suckers are really sensitive to ESD ? Sent from for Windows ? From: [email protected] <[email protected]> on behalf of Rich Miller via groups.io <av8torrich@...>
Sent: Saturday, March 5, 2022 6:02:40 PM To: [email protected] <[email protected]>; [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ?
Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W
Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose.
Looks like the parts hunt is likely on!
Rich
On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote:
The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From:
Rich Miller via groups.io ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From:
Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ?
? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Lothar baier
¿ªÔÆÌåÓýTry to find a cheap working 85047A ,? it uses the same inerts as the 8753D/E/ES including the solid state switch and you get 2 couplers as added bonus . ? Take one word of caution though ,? when handling the switch use a ESD mat and wriststrap or at least put some esd caps or terminations on the SMA connectors ,? those suckers are really sensitive to ESD ? Sent from for Windows ? From: [email protected] <[email protected]> on behalf of Rich Miller via groups.io <av8torrich@...>
Sent: Saturday, March 5, 2022 6:02:40 PM To: [email protected] <[email protected]>; [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ?
Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W
Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose.
Looks like the parts hunt is likely on!
Rich
On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote:
The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From:
Rich Miller via groups.io ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From:
Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ?
? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Yes, I am leaning this way (switch being the issue). I think it could also be that I was running a bunch of two port calibrations using a Agilent 85093 this morning (testing eCal out). I had some averaging on, 1601 Points, and 300KHz of IF B/W Set. Needless to say there was a lot of switching going on today. Let me check the power output now, and then flip it over and pray that one of the connectors on the switch is loose. Looks like the parts hunt is likely on! Rich
On Saturday, March 5, 2022, 06:55:27 PM EST, Lothar baier <lothar@...> wrote:
The reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From: Rich Miller via groups.io
Sent: Saturday, March 5, 2022 5:47 PM To: [email protected]; [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From:
Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ? ? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Lothar baier
¿ªÔÆÌåÓýThe reversing switches are notorious for failures especially if a unit is used in a environment that is not ESD protected .? what you can also do and you have to be cautious if you do this is to remove the switch , remove the hardline from the switch to coupler port 1 and connect the coupler directly to the source , if your trace is consistent then you definatly have a bad switch ! ? ? Sent from for Windows ? From: Rich Miller via groups.io
Sent: Saturday, March 5, 2022 5:47 PM To: [email protected]; [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? Hi Lothar: ? It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? ? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. ? Rich ? On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote: ? ? If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From:
Rich Miller via groups.io ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ? ? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Hi Lothar: It just started failing Port 1 Test. I was doing this just as this email came in. It is failing it consistently. I do not have a power meter, but I can take a look with my Spectrum Analyzer to see if there are power fluctuations at 3GHz. This problem seems to focus at frequencies higher than 3GHz.? Once I have a look at the output power, I will open and have a look. This is a new problem, as I never saw this before. Rich
On Saturday, March 5, 2022, 06:38:56 PM EST, Lothar baier <lothar@...> wrote:
If the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From: Rich Miller via groups.io
Sent: Saturday, March 5, 2022 5:24 PM To: HP-Agilent-Keysight-equipment Subject: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich?
? ? ? |
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Re: HP-8753E S11 Intermittent Results - Switch or Bridge?
Lothar baier
¿ªÔÆÌåÓýIf the S11response changes when you switch back and forth than this would point towards a repeatability issue with the solid state switch the fact that this changes with temperature would also point towards this direction , so here are a few things to try : ?
? Sent from for Windows ? From: Rich Miller via groups.io
Sent: Saturday, March 5, 2022 5:24 PM To: HP-Agilent-Keysight-equipment Subject: [HP-Agilent-Keysight-equipment] HP-8753E S11 Intermittent Results - Switch or Bridge? ? All: ? ? I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: ? 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. ? 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? ? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? ? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). ? I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? ? ? Rich? ? ? ? |
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HP-8753E S11 Intermittent Results - Switch or Bridge?
All: I have an issue with S11 (Port 1). It showed it's head now that I am running two port calibrations, thus I have not detected it just yet. My hunch is I have a problem with the switch, but not the Bridge. Here is what I am observing: 1. Upon boot up I get a good/normal S11 RL Response into a good 50 Ohm Load. This Condition will persist until I do one of the steps below. 2. If I switch to Port 2 (i.e. S22 Measurement), and then back to Port 1 the S11 Response has gone nutty (See Attached Picture).? 3. I have noticed, that if I depress the S11 MEAS multiple times, the S11 RL Response returns to normal.? 4. If you look at the enclosed picture, I have captured what I refer to as a normal S11 response, which I saved to memory (Smooth), and what it looks like after pressing S11 again (Wild variations in response). I have noticed there is a stark difference between instrument, cold and warm on S11. I do not however see this behavior our of any of the Port 2 Measurements regardless of temperature. Is there anywhere else this could be coming from other than the Solid State Switch, or am I way off base in my thinking here?? Rich? |
Jinxie
