|
Does anyone know the pinout of the 08516-60009
interconnect cable that connects the 8516 to the 8341B ?
|
On Mon, Feb 21, 2022 at 07:20 AM, Lothar baier wrote:
08516-60009
You might a standard RS232 cable. It's labeled " CABLE ASSEMBLY, RS232" in the 8516A S-Parameter Test Set Operating and Service Manual.
-George
|
I know it is labeled RS232 but unfortunately that does not mean a regular RS232 Cable can be used , I looked through the service manual for the 8340B and it indicates the pin numbers on the rear panel connector of the 8340 but it refers
to control bit numbers which would indicate a parallel port rather than serial , also the 8516 service manual indicates that the pins are connected to a PAL on the doubler control board , I am a RF not a digital guy but I don’t think you can use a PAL as a
serial decoder
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: gk5220 via groups.io
Sent: Tuesday, February 22, 2022 10:41 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
On Mon, Feb 21, 2022 at 07:20 AM, Lothar baier wrote:
08516-60009
You might a standard RS232 cable. It's labeled "CABLE ASSEMBLY, RS232" in the 8516A S-Parameter Test Set Operating and Service Manual.
-George
|
PALs are combinational logic, such as (using address lines)? A4
and A3 and not A2 and A1 and not A0.
To decode serial data, you need flip-flops, some storage to
convert serial to parallel and then act on that.
CPLD's can do that, but with most PAL chips, depending on what's
internal, it would be difficult.
Generally, PALs are used to decode address lines to enable a
specific chip.
Harvey
On 2/22/2022 1:26 PM, Lothar baier
wrote:
toggle quoted message
Show quoted text
I know it is labeled RS232 but
unfortunately that does not mean a regular RS232 Cable can be
used , I looked through the service manual for the 8340B and
it indicates the pin numbers on the rear panel connector of
the 8340 but it refers to control bit numbers which would
indicate a parallel port rather than serial , also the 8516
service manual indicates that the pins are connected to a PAL
on the doubler control board , I am a RF not a digital guy but
I don’t think you can use a PAL as a serial decoder
?
Sent from for Windows
?
?
On Mon, Feb 21, 2022 at 07:20 AM, Lothar
baier wrote:
08516-60009
You might a standard RS232 cable. It's
labeled "CABLE
ASSEMBLY, RS232" in the 8516A S-Parameter Test Set
Operating and Service Manual.
-George
|
That’s what I thought so the use of a PAL would point towards the control interface indeed being a parallel interface and not serial
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: Harvey White via groups.io
Sent: Tuesday, February 22, 2022 1:04 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
PALs are combinational logic, such as (using address lines)? A4 and A3 and not A2 and A1 and not A0.
To decode serial data, you need flip-flops, some storage to convert serial to parallel and then act on that.
CPLD's can do that, but with most PAL chips, depending on what's internal, it would be difficult.
Generally, PALs are used to decode address lines to enable a specific chip.
Harvey
?
On 2/22/2022 1:26 PM, Lothar baier wrote:
I know it is labeled RS232 but unfortunately that does not mean a regular RS232 Cable can be used , I looked through the service manual for the 8340B and it indicates the pin numbers on the rear panel connector of the 8340 but it refers
to control bit numbers which would indicate a parallel port rather than serial , also the 8516 service manual indicates that the pins are connected to a PAL on the doubler control board , I am a RF not a digital guy but I don’t think you can use a PAL as a
serial decoder
?
Sent from for Windows
?
?
On Mon, Feb 21, 2022 at 07:20 AM, Lothar baier wrote:
08516-60009
You might a standard RS232 cable. It's labeled "CABLE ASSEMBLY, RS232" in the 8516A S-Parameter Test Set Operating and Service Manual.
-George
|
To start with, the 8516 test set does not use a serial communications scheme. The cable is most likely a parallel cable. Why it was specified as RS-232 is strange, unless the thought was that those were very common so a couple of crossed wires (pins 2 & 3 as I recall) were anticipated. Or, they simply did not use those pins since I doubt they needed 25 conductors anyway. This is based on my experience with the 8753 test sets, however,. ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Harvey White
Sent: Tuesday, February 22, 2022 2:05 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question? PALs are combinational logic, such as (using address lines)? A4 and A3 and not A2 and A1 and not A0. To decode serial data, you need flip-flops, some storage to convert serial to parallel and then act on that. CPLD's can do that, but with most PAL chips, depending on what's internal, it would be difficult. Generally, PALs are used to decode address lines to enable a specific chip. Harvey ? On 2/22/2022 1:26 PM, Lothar baier wrote: I know it is labeled RS232 but unfortunately that does not mean a regular RS232 Cable can be used , I looked through the service manual for the 8340B and it indicates the pin numbers on the rear panel connector of the 8340 but it refers to control bit numbers which would indicate a parallel port rather than serial , also the 8516 service manual indicates that the pins are connected to a PAL on the doubler control board , I am a RF not a digital guy but I don’t think you can use a PAL as a serial decoder ? Sent from for Windows ? ? On Mon, Feb 21, 2022 at 07:20 AM, Lothar baier wrote: 08516-60009
You might a standard RS232 cable. It's labeled "CABLE ASSEMBLY, RS232" in the 8516A S-Parameter Test Set Operating and Service Manual.
-George
|
Looking at the 8340 manual it states that PIN4/10/11/17 are used and corresponding to control bits 3/1/0/2? on the testset , I was looking at the 8516 manual and it shows 4 wires from the rear panel connector running to the A5 Doubler control
ending up in a PAL that decodes the adress to control filters , no control bit designation is given !
So the main challenge would be to figure out the pins on the testset side ,? since this is all logic stuff I don’t think there is a risk to just rigging up a 1-1 cable using DB25 connectors and try it
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: n8zmTWH via groups.io
Sent: Tuesday, February 22, 2022 1:30 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
To start with, the 8516 test set does not use a serial communications scheme. The cable is most likely a parallel cable. Why it was specified as RS-232 is strange, unless the
thought was that those were very common so a couple of crossed wires (pins 2 & 3 as I recall) were anticipated. Or, they simply did not use those pins since I doubt they needed 25 conductors anyway. This is based on my experience with the 8753 test sets, however,.
?
?
PALs are combinational logic, such as (using address lines)? A4 and A3 and not A2 and A1 and not A0.
To decode serial data, you need flip-flops, some storage to convert serial to parallel and then act on that.
CPLD's can do that, but with most PAL chips, depending on what's internal, it would be difficult.
Generally, PALs are used to decode address lines to enable a specific chip.
Harvey
?
On 2/22/2022 1:26 PM, Lothar baier wrote:
I know it is labeled RS232 but unfortunately that does not mean a regular RS232 Cable can be used , I looked through the service manual for the 8340B and it indicates the pin numbers on the rear panel connector of the 8340 but it refers
to control bit numbers which would indicate a parallel port rather than serial , also the 8516 service manual indicates that the pins are connected to a PAL on the doubler control board , I am a RF not a digital guy but I don’t think you can use a PAL as a
serial decoder
?
Sent from for Windows
?
?
On Mon, Feb 21, 2022 at 07:20 AM, Lothar baier wrote:
08516-60009
You might a standard RS232 cable. It's labeled "CABLE ASSEMBLY, RS232" in the 8516A S-Parameter Test Set Operating and Service Manual.
-George
|
Points that way.
Harvey
On 2/22/2022 2:21 PM, Lothar baier
wrote:
toggle quoted message
Show quoted text
That’s what I thought so the use of a PAL
would point towards the control interface indeed being a
parallel interface and not serial
?
Sent from for Windows
?
?
PALs are combinational logic, such as (using address lines)?
A4 and A3 and not A2 and A1 and not A0.
To decode serial data, you need flip-flops, some storage to
convert serial to parallel and then act on that.
CPLD's can do that, but with most PAL chips, depending on
what's internal, it would be difficult.
Generally, PALs are used to decode address lines to enable a
specific chip.
Harvey
?
On 2/22/2022 1:26 PM, Lothar baier wrote:
I know it is labeled RS232 but
unfortunately that does not mean a regular RS232 Cable can
be used , I looked through the service manual for the 8340B
and it indicates the pin numbers on the rear panel connector
of the 8340 but it refers to control bit numbers which would
indicate a parallel port rather than serial , also the 8516
service manual indicates that the pins are connected to a
PAL on the doubler control board , I am a RF not a digital
guy but I don’t think you can use a PAL as a serial decoder
?
Sent from for Windows
?
?
On Mon, Feb 21, 2022 at 07:20 AM, Lothar
baier wrote:
08516-60009
You might a standard RS232 cable. It's
labeled "CABLE
ASSEMBLY, RS232" in the 8516A S-Parameter Test Set
Operating and Service Manual.
-George
|
Lothar,
It probably is wired straight through. This is the situation with the serial cable on the 89441A Vector Signal Analyzer System. In that case it's a DB9 connector and is wired straight through even though the chassis/module is labeled as serial. A standard DB9 RS232 cable will not work. It confusing, but almost all HP cables are wired straight through.There are a few exceptions and some weird ones such as the MSIB cables for the 70000 instruments. Just make sure that there are no power pins from either instrument that might damage the PAL if connected incorrectly. -George
|
I got the testset in yesterday and popped the lid , only 4 pins are connected and the PIN numbers match the PIN numbers of the connector on the 8341B that are referenced in the service manual so it appears that you are correct and the cable is wired 1:1 , i
ordered a 3ft DB25 m-m cable on Amazon to see if it will work ok , i got a 8340B that i just sold that has the correct FW and serial number range so i can try the testset , if it works i update the 8341B i have , looking at the manual backdating only the CPU
and marker board changed and both can be found on ebay so updating should be pretty straightforward?
toggle quoted message
Show quoted text
On Feb 23, 2022, at 09:25, gk5220 via groups.io <gk5220@...> wrote:
?Lothar,
It probably is wired straight through. This is the situation with the serial cable on the 89441A Vector Signal Analyzer System. In that case it's a DB9 connector and is wired straight through even though the chassis/module is labeled as serial. A standard DB9
RS232 cable will not work. It confusing, but almost all HP cables are wired straight through.There are a few exceptions and some weird ones such as the MSIB cables for the 70000 instruments. Just make sure that there are no power pins from either instrument
that might damage the PAL if connected incorrectly. -George
|
I have a complete 8516 VNA setup and it was intermittently working with a standard DB25 Thru cable. Right now I am stuck on "NO IF FOUND" error and out of ideas.
|
Ok so the 8510 test-sets have 4 samplers , 2 of them are connected to the couplers , the other 2 are reference samplers , those are connected to the switch/splitter , the RF coming in from the source is split inside of this assembly in
3 paths , 2 reference paths that are connected to the reference samplers the third one is routed to a switch which switches the RF either to coupler 1 or 2 while terminating the unused coupler in 50ohm !
NO IF FOUND usually indicates that either one or both reference samplers does not receive a signal or that the signal level is to low .
This can have multiple reasons :
- The Source output level is to low , cable from source to the testset might be broke
- Doubler amplifier assembly is bad
- Switch /Splitter bad
- Bad sampler or sampler driver
Note that for 2 or 3 defective can also mean issues with the control circuits !
You can also get this error if you have power holes in the source
?
First thing to do is to set the start and stop frequency to a small range like 2-4GHz or 1-2GHz and see if the error goes away, if it does then increase the sweep range to see where the error starts to appear !
Next check the source level at the end of the cable you use to connect the source to the test-set , make sure the level is within the range the test-set can process
If this doesn’t resolve things take the lid of the test-set and check your DC Voltages to ensure they are all correct , next disconnect the output of the doubler amplifier block and check if you have RF coming out ,? you can also connect
the source directly to the cable that connects the doubler to the switch splitter set your sweep from 2-10GHz if the error goes away you have a problem with the doubler or doubler control if its still present you have to check the signal at your samplers if
the signal is there your sampler is bad or the sampler driver
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: ratn9ne via groups.io
Sent: Wednesday, March 2, 2022 2:37 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
I have a complete 8516 VNA setup and it was intermittently working with a standard DB25 Thru cable. Right now I am stuck on "NO IF FOUND" error and out of ideas.
|
Note that the problem could also be in the 85102 IF unit. Do you have either the test set simulator or a second test set of some kind?
The test set simulator is a plug that fits the IF RF outputs and has a connector for the 20.4MHz signal from the IF to provide a signal approximating the outputs from the test set.
It would be bet to confirm the 85102 before digging nto the 8516.
Cheers!
Bruce
Quoting Lothar baier <Lothar@...>:
toggle quoted message
Show quoted text
Ok so the 8510 test-sets have 4 samplers , 2 of them are connected to the couplers , the other 2 are reference samplers , those are connected to the switch/splitter , the RF coming in from the source is split inside of this assembly in 3 paths , 2 reference paths that are connected to the reference samplers the third one is routed to a switch which switches the RF either to coupler 1 or 2 while terminating the unused coupler in 50ohm !
NO IF FOUND usually indicates that either one or both reference samplers does not receive a signal or that the signal level is to low .
This can have multiple reasons :
1. The Source output level is to low , cable from source to the testset might be broke
2. Doubler amplifier assembly is bad
3. Switch /Splitter bad
4. Bad sampler or sampler driver
Note that for 2 or 3 defective can also mean issues with the control circuits !
You can also get this error if you have power holes in the source
First thing to do is to set the start and stop frequency to a small range like 2-4GHz or 1-2GHz and see if the error goes away, if it does then increase the sweep range to see where the error starts to appear !
Next check the source level at the end of the cable you use to connect the source to the test-set , make sure the level is within the range the test-set can process
If this doesn’t resolve things take the lid of the test-set and check your DC Voltages to ensure they are all correct , next disconnect the output of the doubler amplifier block and check if you have RF coming out , you can also connect the source directly to the cable that connects the doubler to the switch splitter set your sweep from 2-10GHz if the error goes away you have a problem with the doubler or doubler control if its still present you have to check the signal at your samplers if the signal is there your sampler is bad or the sampler driver
Sent from Mail<> for Windows
From: ratn9ne via groups.io<mailto:ratn9ne@...>
Sent: Wednesday, March 2, 2022 2:37 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
I have a complete 8516 VNA setup and it was intermittently working with a standard DB25 Thru cable. Right now I am stuck on "NO IF FOUND" error and out of ideas.
|
True but in all the years I been fixing those units back at tucker about 85% of all failures were testset related
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: Bruce via groups.io
Sent: Wednesday, March 2, 2022 4:24 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
Note that the problem could also be in the 85102 IF unit.? Do you have?
either the test set simulator or a second test set of some kind?
The test set simulator is a plug that fits the IF RF outputs and has a?
connector for the 20.4MHz signal from the IF to provide a signal?
approximating the outputs from the test set.
It would be bet to confirm the 85102 before digging nto the 8516.
Cheers!
Bruce
Quoting Lothar baier <Lothar@...>:
> Ok so the 8510 test-sets have 4 samplers , 2 of them are connected?
> to the couplers , the other 2 are reference samplers , those are?
> connected to the switch/splitter , the RF coming in from the source?
> is split inside of this assembly in 3 paths , 2 reference paths that?
> are connected to the reference samplers the third one is routed to a?
> switch which switches the RF either to coupler 1 or 2 while?
> terminating the unused coupler in 50ohm !
> NO IF FOUND usually indicates that either one or both reference?
> samplers does not receive a signal or that the signal level is to?
> low .
> This can have multiple reasons :
>
>?? 1.? The Source output level is to low , cable from source to the?
> testset might be broke
>?? 2.? Doubler amplifier assembly is bad
>?? 3.? Switch /Splitter bad
>?? 4.? Bad sampler or sampler driver
> Note that for 2 or 3 defective can also mean issues with the control?
> circuits !
> You can also get this error if you have power holes in the source
>
> First thing to do is to set the start and stop frequency to a small?
> range like 2-4GHz or 1-2GHz and see if the error goes away, if it?
> does then increase the sweep range to see where the error starts to?
> appear !
> Next check the source level at the end of the cable you use to?
> connect the source to the test-set , make sure the level is within?
> the range the test-set can process
> If this doesn’t resolve things take the lid of the test-set and?
> check your DC Voltages to ensure they are all correct , next?
> disconnect the output of the doubler amplifier block and check if?
> you have RF coming out ,? you can also connect the source directly?
> to the cable that connects the doubler to the switch splitter set?
> your sweep from 2-10GHz if the error goes away you have a problem?
> with the doubler or doubler control if its still present you have to?
> check the signal at your samplers if the signal is there your?
> sampler is bad or the sampler driver
>
> Sent from Mail<> for Windows
>
> From: ratn9ne via groups.io<mailto:ratn9ne@...>
> Sent: Wednesday, March 2, 2022 2:37 PM
> To:?
> [email protected]<mailto:[email protected]>
> Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
>
> I have a complete 8516 VNA setup and it was intermittently working?
> with a standard DB25 Thru cable. Right now I am stuck on "NO IF?
> FOUND" error and out of ideas.
>
>
>
>
>
?
|
Absolutely agree, but it can be problematic to dig into the test set if the problem is in the 85202. The test set is more easilly damaged, particularly if you are unfamiliar with its innards.
The other thing he should confirm is the 834X OUTPUT at the test set input.
Cheers!
Bruce
Quoting Lothar baier <Lothar@...>:
toggle quoted message
Show quoted text
True but in all the years I been fixing those units back at tucker about 85% of all failures were testset related
Sent from Mail<> for Windows
From: Bruce via groups.io<mailto:bruce@...>
Sent: Wednesday, March 2, 2022 4:24 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
Note that the problem could also be in the 85102 IF unit. Do you have
either the test set simulator or a second test set of some kind?
The test set simulator is a plug that fits the IF RF outputs and has a
connector for the 20.4MHz signal from the IF to provide a signal
approximating the outputs from the test set.
It would be bet to confirm the 85102 before digging nto the 8516.
Cheers!
Bruce
Quoting Lothar baier <Lothar@...>:
Ok so the 8510 test-sets have 4 samplers , 2 of them are connected
to the couplers , the other 2 are reference samplers , those are
connected to the switch/splitter , the RF coming in from the source
is split inside of this assembly in 3 paths , 2 reference paths that
are connected to the reference samplers the third one is routed to a
switch which switches the RF either to coupler 1 or 2 while
terminating the unused coupler in 50ohm !
NO IF FOUND usually indicates that either one or both reference
samplers does not receive a signal or that the signal level is to
low .
This can have multiple reasons :
1. The Source output level is to low , cable from source to the
testset might be broke
2. Doubler amplifier assembly is bad
3. Switch /Splitter bad
4. Bad sampler or sampler driver
Note that for 2 or 3 defective can also mean issues with the control
circuits !
You can also get this error if you have power holes in the source
First thing to do is to set the start and stop frequency to a small
range like 2-4GHz or 1-2GHz and see if the error goes away, if it
does then increase the sweep range to see where the error starts to
appear !
Next check the source level at the end of the cable you use to
connect the source to the test-set , make sure the level is within
the range the test-set can process
If this doesn’t resolve things take the lid of the test-set and
check your DC Voltages to ensure they are all correct , next
disconnect the output of the doubler amplifier block and check if
you have RF coming out , you can also connect the source directly
to the cable that connects the doubler to the switch splitter set
your sweep from 2-10GHz if the error goes away you have a problem
with the doubler or doubler control if its still present you have to
check the signal at your samplers if the signal is there your
sampler is bad or the sampler driver
Sent from Mail<> for Windows
From: ratn9ne via groups.io<mailto:ratn9ne@...>
Sent: Wednesday, March 2, 2022 2:37 PM
To:
[email protected]<mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
I have a complete 8516 VNA setup and it was intermittently working
with a standard DB25 Thru cable. Right now I am stuck on "NO IF
FOUND" error and out of ideas.
|
Agreed you have to excersize caution when working on the test set especially if it comes to 2.4mm connectors and hardlines
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: Bruce via groups.io
Sent: Wednesday, March 2, 2022 4:32 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
Absolutely agree, but it can be problematic to dig into the test set?
if the problem is in the 85202.? The test set is more easilly damaged,?
particularly if you are unfamiliar with its innards.
The other thing he should confirm is the 834X OUTPUT at the test set input.
Cheers!
Bruce
Quoting Lothar baier <Lothar@...>:
> True but in all the years I been fixing those units back at tucker?
> about 85% of all failures were testset related
>
> Sent from Mail<> for Windows
>
> From: Bruce via groups.io<mailto:bruce@...>
> Sent: Wednesday, March 2, 2022 4:24 PM
> To:?
> [email protected]<mailto:[email protected]>
> Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
>
> Note that the problem could also be in the 85102 IF unit.? Do you have
> either the test set simulator or a second test set of some kind?
>
> The test set simulator is a plug that fits the IF RF outputs and has a
> connector for the 20.4MHz signal from the IF to provide a signal
> approximating the outputs from the test set.
>
> It would be bet to confirm the 85102 before digging nto the 8516.
>
> Cheers!
>
> Bruce
>
> Quoting Lothar baier <Lothar@...>:
>
>> Ok so the 8510 test-sets have 4 samplers , 2 of them are connected
>> to the couplers , the other 2 are reference samplers , those are
>> connected to the switch/splitter , the RF coming in from the source
>> is split inside of this assembly in 3 paths , 2 reference paths that
>> are connected to the reference samplers the third one is routed to a
>> switch which switches the RF either to coupler 1 or 2 while
>> terminating the unused coupler in 50ohm !
>> NO IF FOUND usually indicates that either one or both reference
>> samplers does not receive a signal or that the signal level is to
>> low .
>> This can have multiple reasons :
>>
>>?? 1.? The Source output level is to low , cable from source to the
>> testset might be broke
>>?? 2.? Doubler amplifier assembly is bad
>>?? 3.? Switch /Splitter bad
>>?? 4.? Bad sampler or sampler driver
>> Note that for 2 or 3 defective can also mean issues with the control
>> circuits !
>> You can also get this error if you have power holes in the source
>>
>> First thing to do is to set the start and stop frequency to a small
>> range like 2-4GHz or 1-2GHz and see if the error goes away, if it
>> does then increase the sweep range to see where the error starts to
>> appear !
>> Next check the source level at the end of the cable you use to
>> connect the source to the test-set , make sure the level is within
>> the range the test-set can process
>> If this doesn’t resolve things take the lid of the test-set and
>> check your DC Voltages to ensure they are all correct , next
>> disconnect the output of the doubler amplifier block and check if
>> you have RF coming out ,? you can also connect the source directly
>> to the cable that connects the doubler to the switch splitter set
>> your sweep from 2-10GHz if the error goes away you have a problem
>> with the doubler or doubler control if its still present you have to
>> check the signal at your samplers if the signal is there your
>> sampler is bad or the sampler driver
>>
>> Sent from Mail<> for Windows
>>
>> From: ratn9ne via groups.io<mailto:ratn9ne@...>
>> Sent: Wednesday, March 2, 2022 2:37 PM
>> To:
>> [email protected]<mailto:[email protected]>
>> Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
>>
>> I have a complete 8516 VNA setup and it was intermittently working
>> with a standard DB25 Thru cable. Right now I am stuck on "NO IF
>> FOUND" error and out of ideas.
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
>
>
>
?
|
Wow you guys are fast to help!
Here is some more info: error is only from 20-40GHz, so it has something to do with the doubler I assume. Any span or frequency in this range has this error. I have seen >20GHz work for a little while but only randomly. My next idea is a shorter DB25 cable as mine is about 20 feet long. Tried turning up the LO power coming in on the sweeper with no luck. I can't find a replacement doubler on ebay to test with. These must be very rare. Can they be serviced? This display/sweeper/control box setup has been tested with an 8515 and no errors at all.
|
Ok first of be careful with how much power you put in the testset , the damage level as far as I remember is 15dBm but usually I would not put more than 10dBm.
First thing I check is whether your cable is wired 1:1 and not a crossover cable.
Next thing is that 20ft is way too long in my view, the capacitance of the cable might get you in trouble , the original cable is about 12” long , I used a 5ft cable with no issues but switched to a 3ft cable i bought on amazon and never
seen any issues !
Try a shorter cable , if this don’t solve your issue you might have a problem with the doubler .
Also make sure your source if you are using a 8340/41 has S/N 2812A or higher and 11 May 88 firmware
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: ratn9ne via groups.io
Sent: Wednesday, March 2, 2022 5:15 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
Wow you guys are fast to help!
Here is some more info: error is only from 20-40GHz, so it has something to do with the doubler I assume. Any span or frequency in this range has this error. I have seen >20GHz work for a little while but only randomly. My next idea is a shorter DB25 cable
as mine is about 20 feet long. Tried turning up the LO power coming in on the sweeper with no luck. I can't find a replacement doubler on ebay to test with. These must be very rare. Can they be serviced? This display/sweeper/control box setup has been tested
with an 8515 and no errors at all.
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Does the IF error occur below 20 GHz ?? If not, the doubler is suspect - if so, look at the switching or the test set.
Nexg step would be to try and look at the test set VTO. It is difficult because they pipe it directly into the samplers.
Cheers!
Bruce
Quoting ratn9ne@...:
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Wow you guys are fast to help!
Here is some more info: error is only from 20-40GHz, so it has something to do with the doubler I assume. Any span or frequency in this range has this error. I have seen >20GHz work for a little while but only randomly. My next idea is a shorter DB25 cable as mine is about 20 feet long. Tried turning up the LO power coming in on the sweeper with no luck. I can't find a replacement doubler on ebay to test with. These must be very rare. Can they be serviced? This display/sweeper/control box setup has been tested with an 8515 and no errors at all.
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He mentioned earlier in this thread that its only 20-40GHz but he also mentioned using a 20ft cable
? which could be the problem, I am not sure what the control interface is , the part number of the control cable says RS232 and there are 4 lines connected in the testset BUT the doubler control uses
a PAL as a decoder so I think it’s a parallel interface and having a 20ft cable could be a bit much
?
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From: Bruce via groups.io
Sent: Wednesday, March 2, 2022 6:21 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question
?
Does the IF error occur below 20 GHz ??? If not, the doubler is?
suspect - if so, look at the switching or the test set.
Nexg step would be to try and look at the test set VTO.? It is?
difficult because they pipe it directly into the samplers.
Cheers!
Bruce
Quoting ratn9ne@...:
> Wow you guys are fast to help!
> Here is some more info: error is only from 20-40GHz, so it has?
> something to do with the doubler I assume. Any span or frequency in?
> this range has this error. I have seen >20GHz work for a little?
> while but only randomly. My next idea is a shorter DB25 cable as?
> mine is about 20 feet long. Tried turning up the LO power coming in?
> on the sweeper with no luck. I can't find a replacement doubler on?
> ebay to test with. These must be very rare. Can they be serviced??
> This display/sweeper/control box setup has been tested with an 8515?
> and no errors at all.
>
>
>
?
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Willy
