Re: A homemade diode power sensor for HP meters
Thank you Dave for those kind words of love
Paul
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Dave McGuire Sent: 19 May 2022 21:26 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters On 5/19/22 16:19, Paul Bicknell wrote: Do not worry about Typos as I must be the worst speller on this sight Of that there can be NO doubt. But we all love you anyway. ;) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: A homemade diode power sensor for HP meters
On 5/19/22 16:19, Paul Bicknell wrote: Do not worry about Typos as I must be the worst speller on this sight Of that there can be NO doubt. But we all love you anyway. ;) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: A homemade diode power sensor for HP meters
Hi Bruce
Thank you for confirming the 8484A is a Diode front end and On re reading your previews mail again it is as clear as MUD
Do not worry about Typos as I must be the worst speller on this sight
Paul
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Bruce Sent: 19 May 2022 21:12 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters It is a type - I meant Diode The 8484 is a DIODE sensor - many other HP diode ensors have a D in the model number as explained B4 Cheers! Beruce Quoting Paul Bicknell <admin@...>: OK Bruce please explain !
You say (The 8484 is a dione power sensor. Many other HP diode
sensors end with t "D" instead of an "A" in the model number.)
I do not understand ?? also is dione in the above line a typo
So Is the 8484A power sensor is a diode front end ??
Paul
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Bruce
Sent: 19 May 2022 20:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
The 8484 is a dione power sensor. Many other HP diode sensors end
with t "D" instead of an "A" in the model number.
E.g. 8485D as opposed to 8485A
Cheers!
Bruce
Quoting Paul Bicknell <admin@...
<mailto:admin@...> >:
From memory the 8484 power sensor is a diode front end
But a working 8481 or 8484 go for about ?120 to ?160 in the UK
equivalent to a day¡¯s wages
And it would take best part of a day to modify busted thermocouples
for a diode by the time you did any calibration
Regards Paul
From: [email protected]
<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of
visitslovenija
Sent: 19 May 2022 11:20
To: [email protected]
<mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and
would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price,
has anyone successfully reworked one with busted thermocouples and
modified for a diode front end? I know it¡¯s small and very fiddly,
but is that not easier than trying to build one from scratch?
|
Re: A homemade diode power sensor for HP meters
It is a type - I meant Diode The 8484 is a DIODE sensor - many other HP diode ensors have a D in the model number as explained B4 Cheers! Beruce Quoting Paul Bicknell <admin@...>:
OK Bruce please explain !
You say (The 8484 is a dione power sensor. Many other HP diode sensors end with t "D" instead of an "A" in the model number.)
I do not understand ?? also is dione in the above line a typo
So Is the 8484A power sensor is a diode front end ??
Paul
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Bruce
Sent: 19 May 2022 20:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters
The 8484 is a dione power sensor. Many other HP diode sensors end with t "D" instead of an "A" in the model number.
E.g. 8485D as opposed to 8485A
Cheers!
Bruce
Quoting Paul Bicknell <admin@... <mailto:admin@...> >:
From memory the 8484 power sensor is a diode front end
But a working 8481 or 8484 go for about ?120 to ?160 in the UK
equivalent to a day¡¯s wages
And it would take best part of a day to modify busted thermocouples
for a diode by the time you did any calibration
Regards Paul
From: [email protected] <mailto:[email protected]>
[mailto:[email protected]] On Behalf Of
visitslovenija
Sent: 19 May 2022 11:20
To: [email protected] <mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and
would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has
anyone successfully reworked one with busted thermocouples and
modified for a diode front end? I know it¡¯s small and very fiddly, but
is that not easier than trying to build one from scratch?
|
Re: A homemade diode power sensor for HP meters
The connecters are available, Binder make 3 types and they did cost ?10 , ? 13 ?and ?16? each ? Regarding Diode sensors do not forget the 430 meter was made for Diode sensors? also I believe the early 431 A had a switch position for Diode ? Personally looking for a modern meter ( not expensive ) for wave guide diode detectors but calibrated in dB Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Alexandre Souza
Sent: 19 May 2022 20:49
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters ? Talking about power sensor, I got lucky enough to get a (working) 436b and a WORKING \o/ sensor. But unfortunately, got it without the cable. Is there a cheaper source for the cable than ebay? ---8<---Corte aqui---8<--- ---8<---Corte aqui---8<--- ? ? Em qui., 19 de mai. de 2022 ¨¤s 13:41, visitslovenija <musto102@...> escreveu: An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has anyone successfully reworked one with busted thermocouples and modified for a diode front end? I know it¡¯s small and very fiddly, but is that not easier than trying to build one from scratch?
|
Re: A homemade diode power sensor for HP meters
OK Bruce? please explain !
You say ? (The 8484 is a dione power sensor.? Many other HP diode sensors end with t "D" instead of an "A" in the model number.)
I do not understand ??? also is dione in the above line a typo
So Is the 8484A power sensor is a diode? front end ??
Paul
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Bruce
Sent: 19 May 2022 20:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters
The 8484 is a dione power sensor.? Many other HP diode sensors end with t "D" instead of an "A" in the model number.
E.g. 8485D as opposed to 8485A
Cheers!
Bruce
Quoting Paul Bicknell <admin@...>:
> From memory the 8484 power sensor is a diode? front end
>
>
>
> But a working 8481? or 8484 go for about ?120 to ?160 in the UK
> equivalent to a day¡¯s wages
>
> And it would take best part of a day to modify busted thermocouples
> for a diode by the time you did any calibration
>
> Regards Paul
>
>
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> visitslovenija
> Sent: 19 May 2022 11:20
> To: [email protected]
> Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power
> sensor for HP meters
>
>
>
> An interesting and long running thread.
>
> Like many, I have a bit of a soft spot for the old HP435 meters and
> would like to have one working on the bench.
>
> Since broken detectors do show up now and again at a decent price, has
> anyone successfully reworked one with busted thermocouples and
> modified for a diode front end? I know it¡¯s small and very fiddly, but
> is that not easier than trying to build one from scratch?
>
>
>
>
>
>
|
Re: A homemade diode power sensor for HP meters
Hi Paul sounds like you have re engendered the 435? and you say you have achieved a 65 dB dynamic range? that is excellent and good for most Amateurs to ?6 Ghz ?but a lot want 10 Ghz? ?suggest you write it up for one of the magazines that Pay just as mater of interest? other than lots of Time ( I assume Weeks ) how much did it cost excluding the donor 435 ? Personally I repair the 432 and 435 meter usually it is the meter face and help UK Amateurs out with parts Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of paulswed
Sent: 19 May 2022 18:52
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters ? The diode approach would be the way to go. Like many of you I also like the large scale HP power meters. You can pick the bodies up for nothing. Though suddenly there seems to be a magical market for a body without sensors. An approach I recently took that has worked was to leverage the analog devices power sensors into a 435 body. This approach really couldn't use anything?inside of the 435. The Analog device sensor in a small box with very flexible?cable goes to an arduino that maps the linear to the log scale of the 435. Since the sensor works from?+15 to -50db I reused the switch to select new scaling in 10 db steps. Also to create a broad range 0 to -50 db scale. I like the meter a lot and it now sets on top?the real HP-435. The real one for very accurate readings to 18 GHz the new one good to 6 GHz. It really works well as I rarely need .25 db accuracy on anything. The Linear to log was quite a challenge as I learned. Though the meter is very nice this was a complex project so not sure its useful to many. If the diode approach can work as Dave says then that would be the best approach with the least building challenge. If you don't need 18GHz bandwidth maybe you can get away with larger components.
|
Re: A homemade diode power sensor for HP meters
Talking about power sensor, I got lucky enough to get a (working) 436b and a WORKING \o/ sensor. But unfortunately, got it without the cable. Is there a cheaper source for the cable than ebay?
73 de PU2SEX Alexandre
---8<---Corte aqui---8<---
---8<---Corte aqui---8<--- Em qui., 19 de mai. de 2022 ¨¤s 13:41, visitslovenija < musto102@...> escreveu:
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has anyone successfully reworked one with busted thermocouples and modified for a diode front end? I know it¡¯s small and very fiddly, but is that not easier than trying to build one from scratch?
|
Re: A homemade diode power sensor for HP meters
The 8484 is a dione power sensor. Many other HP diode sensors end with t "D" instead of an "A" in the model number. E.g. 8485D as opposed to 8485A Cheers! Bruce Quoting Paul Bicknell <admin@...>:
From memory the 8484 power sensor is a diode front end
But a working 8481 or 8484 go for about ?120 to ?160 in the UK equivalent to a day¡¯s wages
And it would take best part of a day to modify busted thermocouples for a diode by the time you did any calibration
Regards Paul
From: [email protected] [mailto:[email protected]] On Behalf Of visitslovenija
Sent: 19 May 2022 11:20
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has anyone successfully reworked one with busted thermocouples and modified for a diode front end? I know it¡¯s small and very fiddly, but is that not easier than trying to build one from scratch?
|
Re: Converting a 3336A signal gen to 3336C
Updates & errors in my previous post :
- Display keyboard panel is A5 not A4...
- High accuracy attenuator is still there...its center behind the "modify" potentiometer control...whats is removed is the "balanced output module" designated A11 for the 3336A and A10 for the 3336B
To avoid more "hacking" of the 3336A front panel in the conversion to a 3336C, I cut traces to SW37 & its button led and tacked all this on to SW36 pads. 50 & 75 outputs are not "centered" like the 3336C but this way buttons are aligned with corresponding outputs. I left SW38 (now useless) in. A metal plate was affixed to he back of the front panal to fill the 2 square holes closest to the "modify" pot in front panel...round holes were drilled in that plate and a 50 ohms bnc and a 75 ohms "F" female connector were put there. Claude Claude
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Re: A homemade diode power sensor for HP meters
From memory the 8484 power sensor is a diode? front end ? But a working 8481? or 8484 go for about ?120 to ?160 in the UK equivalent to a day¡¯s wages? And it would take best part of a day to modify busted thermocouples for a diode by the time you did any calibration Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of visitslovenija
Sent: 19 May 2022 11:20
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters ? An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has anyone successfully reworked one with busted thermocouples and modified for a diode front end? I know it¡¯s small and very fiddly, but is that not easier than trying to build one from scratch?
|
Re: hp 16702 LA connectivity questio: GPIB, RS-232 > USB, Ethernet
On Thu, May 19, 2022 at 11:20 AM Mark Litwack <mlitwack@...> wrote:
I don't see that there was ever a GPIB option for the 167xx series.
There is actually a TI 9914 GPIB controller populated on the 16700-series logic analyzer CPU board, along with a 75ALS160 and 74ALS164, and a 24-pin header populated where a back panel GPIB connector could have been populated instead. That is because the 16700-series logic analyzer CPU board was originally used for the E4406A. There are E4406-xxxxx stickers on some of the programmable components of the 16700 CPU board. In the E4406A application the back panel GPIB connector is populated on the CPU board. Maybe there were plans to make use of the GPIB controller in the 16700-series logic analyzer application that never materialized.
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Re: hp 16702 LA connectivity questio: GPIB, RS-232 > USB, Ethernet
I don't see that there was ever a GPIB option for the 167xx series.
There used to be GPIB<-->RS232 boxes, such as the IOTech Micro488EX, that could be operate as a controller if you wanted the 167xx to control GPIB devices via the RS232 port, or it could be used as a gateway to allow GPIB controllers to talk to the 167xx via RS232.? In either scenario, you will need to roll your own code to do anything useful.
USB to RS232 converters are fairly common if you want to talk to the 167xx from a USB host.? By default it would only give you a shell prompt from the 167xx, but you could set up SLIP to get an IP connection going.
Why not use the Ethernet port?? What are trying to accomplish?? Or trying to avoid?
-mark
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Re: A homemade diode power sensor for HP meters
The biggest issue you run into with diodes is that they have a limited dynamic range if it comes to linearity , agilent tried to compensate for this in the E9300 series sensors by using multiple sensing elements that are switched based
on the input power , generally reaching 10GHz with packaged diodes that are manageable in a regular home lab is doable but above you need to use beam leads or die level parts which are not quite as easy to handle !
?
?
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From: [email protected] < [email protected]>
On Behalf Of paulswed via groups.io
Sent: Thursday, May 19, 2022 12:52 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters
?
The diode approach would be the way to go. Like many of you I also like the large scale HP power meters. You can pick the bodies up for nothing. Though suddenly there seems to be a magical
market for a body without sensors.
An approach I recently took that has worked was to leverage the analog devices power sensors into a 435 body. This approach really couldn't use anything?inside of the 435.
The Analog device sensor in a small box with very flexible?cable goes to an arduino that maps the linear to the log scale of the 435.
Since the sensor works from?+15 to -50db I reused the switch to select new scaling in 10 db steps. Also to create a broad range 0 to -50 db scale.
I like the meter a lot and it now sets on top?the real HP-435.
The real one for very accurate readings to 18 GHz the new one good to 6 GHz. It really works well as I rarely need .25 db accuracy on anything.
The Linear to log was quite a challenge as I learned.
Though the meter is very nice this was a complex project so not sure its useful to many.
If the diode approach can work as Dave says then that would be the best approach with the least building challenge.
If you don't need 18GHz bandwidth maybe you can get away with larger components.
|
Re: A homemade diode power sensor for HP meters
The diode approach would be the way to go. Like many of you I also like the large scale HP power meters. You can pick the bodies up for nothing. Though suddenly there seems to be a magical market for a body without sensors. An approach I recently took that has worked was to leverage the analog devices power sensors into a 435 body. This approach really couldn't use anything?inside of the 435. The Analog device sensor in a small box with very flexible?cable goes to an arduino that maps the linear to the log scale of the 435. Since the sensor works from?+15 to -50db I reused the switch to select new scaling in 10 db steps. Also to create a broad range 0 to -50 db scale. I like the meter a lot and it now sets on top?the real HP-435. The real one for very accurate readings to 18 GHz the new one good to 6 GHz. It really works well as I rarely need .25 db accuracy on anything. The Linear to log was quite a challenge as I learned. Though the meter is very nice this was a complex project so not sure its useful to many. If the diode approach can work as Dave says then that would be the best approach with the least building challenge. If you don't need 18GHz bandwidth maybe you can get away with larger components. Regards Paul WB8TSL
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Re: A homemade diode power sensor for HP meters
Of course. I have a Weinschel NBS power sensor calibration system in my lab. B-)
-Dave
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On 5/19/22 13:35, Lothar baier wrote: It¡¯s a different story obviously if you design a complete new sensor but then you still have the problem that you need access to a calibrated sensor to establish your calibration factors
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire via groups.io
Sent: Thursday, May 19, 2022 12:28 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters
I'm not talking about putting a diode where the thermocouple used to be, I'm talking generally about diode-based sensors on these meters.
I'm quite aware of the internals, having studied them extensively and designed hardware for that interface.
-Dave
On 5/19/22 13:22, Lothar baier wrote:
Yes there were diode based models ( 81D , 84A) but the electronics
differed from the A/B/H series circuit boards , you can compare the
schematics to see that there are differences , its also not just about
"working" you can most certainly get something that will read power
but duplicating the original specs in terms of linearity and accuracy
is a different story
-----Original Message-----
From: [email protected]
<[email protected]> On Behalf Of Dave McGuire
via groups.io
Sent: Thursday, May 19, 2022 12:14 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
I have a diode front end for this power meter interface working on the bench. It's certainly possible. And let's not forget that there were already diode-based sensors in that product line.
-Dave
On 5/19/22 12:52, Lothar baier wrote:
Long story short you cant fix the 8481 or replace them with a diode ,
the 848x series was based on a thermocouple that was designed by HP ,
the parts are not available from HP , one guy sells waffle packs of
them on ebay for like $7000 or so but even if you buy them replacing
the part requires a lot of skills and a steady hand , as far as
diodes concerns the output voltage of diodes and the characteristics
are not compatible with the electronics in the 848x
*From:* [email protected]
<[email protected]> *On Behalf Of
*visitslovenija via groups.io
*Sent:* Thursday, May 19, 2022 5:20 AM
*To:* [email protected]
*Subject:* Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and
would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price,
has anyone successfully reworked one with busted thermocouples and
modified for a diode front end? I know it¡¯s small and very fiddly,
but is that not easier than trying to build one from scratch?
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: A homemade diode power sensor for HP meters
It¡¯s a different story obviously if you design a complete new sensor but then you still have the problem that you need access to a calibrated sensor to establish your calibration factors
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Dave McGuire via groups.io Sent: Thursday, May 19, 2022 12:28 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters I'm not talking about putting a diode where the thermocouple used to be, I'm talking generally about diode-based sensors on these meters. I'm quite aware of the internals, having studied them extensively and designed hardware for that interface. -Dave On 5/19/22 13:22, Lothar baier wrote: Yes there were diode based models ( 81D , 84A) but the electronics
differed from the A/B/H series circuit boards , you can compare the
schematics to see that there are differences , its also not just about
"working" you can most certainly get something that will read power
but duplicating the original specs in terms of linearity and accuracy
is a different story
-----Original Message-----
From: [email protected]
<[email protected]> On Behalf Of Dave McGuire
via groups.io
Sent: Thursday, May 19, 2022 12:14 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
I have a diode front end for this power meter interface working on the bench. It's certainly possible. And let's not forget that there were already diode-based sensors in that product line.
-Dave
On 5/19/22 12:52, Lothar baier wrote:
Long story short you cant fix the 8481 or replace them with a diode ,
the 848x series was based on a thermocouple that was designed by HP ,
the parts are not available from HP , one guy sells waffle packs of
them on ebay for like $7000 or so but even if you buy them replacing
the part requires a lot of skills and a steady hand , as far as
diodes concerns the output voltage of diodes and the characteristics
are not compatible with the electronics in the 848x
*From:* [email protected]
<[email protected]> *On Behalf Of
*visitslovenija via groups.io
*Sent:* Thursday, May 19, 2022 5:20 AM
*To:* [email protected]
*Subject:* Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and
would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price,
has anyone successfully reworked one with busted thermocouples and
modified for a diode front end? I know it¡¯s small and very fiddly,
but is that not easier than trying to build one from scratch?
--
Dave McGuire, AK4HZ
New Kensington, PA
-- Dave McGuire, AK4HZ New Kensington, PA
|
Re: A homemade diode power sensor for HP meters
I'm not talking about putting a diode where the thermocouple used to be, I'm talking generally about diode-based sensors on these meters. I'm quite aware of the internals, having studied them extensively and designed hardware for that interface.
-Dave
toggle quoted message
Show quoted text
On 5/19/22 13:22, Lothar baier wrote: Yes there were diode based models ( 81D , 84A) but the electronics differed from the A/B/H series circuit boards , you can compare the schematics to see that there are differences , its also not just about "working" you can most certainly get something that will read power but duplicating the original specs in terms of linearity and accuracy is a different story
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire via groups.io
Sent: Thursday, May 19, 2022 12:14 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters
I have a diode front end for this power meter interface working on the bench. It's certainly possible. And let's not forget that there were already diode-based sensors in that product line.
-Dave
On 5/19/22 12:52, Lothar baier wrote:
Long story short you cant fix the 8481 or replace them with a diode ,
the 848x series was based on a thermocouple that was designed by HP ,
the parts are not available from HP , one guy sells waffle packs of
them on ebay for like $7000 or so but even if you buy them replacing
the part requires a lot of skills and a steady hand , as far as diodes
concerns the output voltage of diodes and the characteristics are not
compatible with the electronics in the 848x
*From:* [email protected]
<[email protected]> *On Behalf Of
*visitslovenija via groups.io
*Sent:* Thursday, May 19, 2022 5:20 AM
*To:* [email protected]
*Subject:* Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and
would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has
anyone successfully reworked one with busted thermocouples and
modified for a diode front end? I know it¡¯s small and very fiddly, but
is that not easier than trying to build one from scratch?
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: A homemade diode power sensor for HP meters
Yes there were diode based models ( 81D , 84A) but the electronics differed from the A/B/H series circuit boards , you can compare the schematics to see that there are differences , its also not just about "working" you can most certainly get something that will read power but duplicating the original specs in terms of linearity and accuracy is a different story
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Dave McGuire via groups.io Sent: Thursday, May 19, 2022 12:14 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] A homemade diode power sensor for HP meters I have a diode front end for this power meter interface working on the bench. It's certainly possible. And let's not forget that there were already diode-based sensors in that product line. -Dave On 5/19/22 12:52, Lothar baier wrote: Long story short you cant fix the 8481 or replace them with a diode ,
the 848x series was based on a thermocouple that was designed by HP ,
the parts are not available from HP , one guy sells waffle packs of
them on ebay for like $7000 or so but even if you buy them replacing
the part requires a lot of skills and a steady hand , as far as diodes
concerns the output voltage of diodes and the characteristics are not
compatible with the electronics in the 848x
*From:* [email protected]
<[email protected]> *On Behalf Of
*visitslovenija via groups.io
*Sent:* Thursday, May 19, 2022 5:20 AM
*To:* [email protected]
*Subject:* Re: [HP-Agilent-Keysight-equipment] A homemade diode power
sensor for HP meters
An interesting and long running thread.
Like many, I have a bit of a soft spot for the old HP435 meters and
would like to have one working on the bench.
Since broken detectors do show up now and again at a decent price, has
anyone successfully reworked one with busted thermocouples and
modified for a diode front end? I know it¡¯s small and very fiddly, but
is that not easier than trying to build one from scratch?
-- Dave McGuire, AK4HZ New Kensington, PA
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Re: hp 16702 LA connectivity questio: GPIB, RS-232 > USB, Ethernet
Looking at the rear panel of a 16700B, I don't see any provision
for a GPIB connector. The little top sub-panel with most of the
i/o connections is removable, so can't say for sure that there is
no GPIB possible, but they did not make it easy if it is possible.
Regards,
Bill
On 5/19/22 09:16, green wrote:
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hi,
Exploring 1670x connectivity,? .... Other than the onboard 16702
Ethernet:
Has anyone attempted to use either a)? GPIB?? or? b)? RS-232 >
USB? for connectivity of the 16700 / 16702? to other HP equipment
( instruments or CPU's ) ?
a) - Was there a GPIB option for the 16702 ?
and how to implement GPIB if one's 16702 does not currently have
it (? some # plug-in card ??,? SW enabled ?? ) ?
If the 16702 had GPIB, can the LA collected data, be sent to to
other hp GPIB instruments, or hp 9000 cpu's ?
b) - RS-232 to USB converter module ?
Anyone done this
? & have the details ?
thank you,
rick
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Paul Bicknell
Dave McGuire
Alexandre Souza