Re: HP 8662A Power up - overvoltage shutdown
I modified a 8662 with the meanwell supplies. Works great. Will not argue nor can I prove that somehow the meanwells added some noise or other artifact. Its?just works. It was a job to install them. Also like you before going to that trouble I jumpered in external supplies to insure the 8662 only had this one issue. That was the case.? I did a?serious attempt to repair the HP switcher. It was really good at destroying transistors in a flash. They are expensive. So the meanwells have a fixed one time?cost. I have another 8662 that works but only when needed doesn't.... Very hard to catch whats?going on. Good luck, nice generator when working. Regards Paul
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Re: Frequency range of HP 5352B frequency counter
I have 2 5350B counters, one unit had very poor sensitivity on input 2.
I found a diode on that input PCB slightly leaky in and out of circuit, it
was easy to find and that corrected the problem.
If interested I can look up further information??
--
Jeffeelcr.
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Re: anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
Yes, I wish there were more hamfests on the schedule. Will keep eyes out.?
73 se Samudra N3RDX?
On Wed, May 25, 2022, 17:53 Tom Lee < tomlee@...> wrote:
I've encountered a fair number of Autohet(Racal-Dana) microwave
counters at hamfests and e-fleas for under $100. They're rack mount
affairs, so not as convenient a form factor as your counter.? The
more modern Racal-Dana 2101 is similar in specs and form factor to
your 5342A, so that might be worth considering. It does have a
congenital design weakness, though -- the pushbuttons are crap.
Replacing them is straightforward and cheap, but tedious.
If your needs would be satisfied with a top end of 14GHz or so (mine
makes it to 16GHz, albeit with degraded sensitivity), you can build
a divide-by-eight prescaler fairly easily, using the Hittite (now
ADI) HMC363. They also have (or had) an eval board, if you prefer
pre-made over DIY. Couple that with a dirt-cheap 2GHz counter, and
you'd be good to go.
--Cheers
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
On 5/25/2022 14:31, Samudra wrote:
Hi again, I am installing my HP 5342a counter, which is working,
but it never came with GPIB i/f. I see the manual specifies option
001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP
Input Assy.
Not wanting to spend more money into this beast (that much), are
these parts unobtanium? I'm just wanting to automate certain set
of measurements I plan to do. It's not do or die, just will take
time to do them that's for sure.?
What's a reasonable, ham-friendly counter that does the same thing
as the HP5432a nowadays? I have seen many smaller counters up to 2
Ghz within reach .. but 18 GHz??
|
Re: HP 8662A Power up - overvoltage shutdown
Thanks Askild - I read your thread - really interesting project - thanks for sharing it.
Your current draw info is really useful. ?I had no idea the 5.2V supply drew that amount of current. The instrument is pretty power hungry (I think the spec sheet quoted 470 VA max) so I should have expected this in retrospect.
im going to try loading up the PSU I (think I) have fixed to much nearer these typical operating values and see if it abolishes the start up problems.
thanks
Tony
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Re: anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
Hi,
It's not at all unobtanium. In fact, I have purchased an option 011 (it is the HPIB, 001 is the OCXO) some time ago on eBay. It consists of the HPIB board that plugs into the backplane and the HPIB connector that goes to the back of the instrument. It wasn't very expensive, I guess there is not much demand, but there are not that many for sale. However, you can watch for cheap faulty 5342a's mostly with blown front-end that has hpib and use that.
Szabolcs
Hi again, I am installing my HP 5342a counter, which is working, but it never came with GPIB i/f. I see the manual specifies option 001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP Input Assy.
Not wanting to spend more money into this beast (that much), are these parts unobtanium? I'm just wanting to automate certain set of measurements I plan to do. It's not do or die, just will take time to do them that's for sure.?
What's a reasonable, ham-friendly counter that does the same thing as the HP5432a nowadays? I have seen many smaller counters up to 2 Ghz within reach .. but 18 GHz??
|
Re: Info Need on a RF FET for a Agilent E4438C signal generator
Do you have the schematic of the stage ?? if so can you share it ?
Let me render a few comments / thoughts on this :
- The first thing that needs to be established is whether the original part is a FET or a MMIC amplifier ,? you can tell by looking at the schematics , if there is a bias applied to
both input and output or just the output of the block , if bias is only applied to the output than its more than likely a MMIC amplifier if bias exists on both gate and drain than it¡¯s a FET/HEMT !
- If the part is a FET than there should be matching as well as feedback networks present , since this is a stage operating over a wide frequency range resistive feedback between gate
and drain will most certainly be required in addition to lumped input and output matching circuits
- Based on the gain and output power estimate you provided as well as the frequency range of the generator I question the assessment of this part being a FET and rather assume this being
a MMIC as it would be hard to reach 20Db gain and 27dBm P1Db up to 4GHz
- If the part is a FET using matching networks it will be hard to find a drop in replacement , if you were to find a part in a SOT-89 package you will most certainly have to re-design
the matching networks as S-parameters will be different
?
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]>
On Behalf Of Peter Hansen via groups.io
Sent: Wednesday, May 25, 2022 4:16 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Info Need on a RF FET for a Agilent E4438C signal generator
?
I am rapiring a E4438C generator. There is a FET shorted in the output of chain of the 4Ghz path. The FET is called M11X1005. I can see traces of it existing but no
data. The SHF-0189Z can be used but not directly. The M11X1005 is using 6.5V on the drain but the SHF-0189 uses 8V and has higher gain and higher output.
Does anyone have either a M11X1005 Fet, data or a suitable repleacement.
I would assume something having 20dB of gain and +27dBm output.
best regards Peter
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Re: anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
On 5/25/22 17:31, Samudra wrote: Hi again, I am installing my HP 5342a counter, which is working, but it never came with GPIB i/f. I see the manual specifies option 001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP Input Assy.
Not wanting to spend more money into this beast (that much), are these parts unobtanium? I'm just wanting to automate certain set of measurements I plan to do. It's not do or die, just will take time to do them that's for sure.
What's a reasonable, ham-friendly counter that does the same thing as the HP5432a nowadays? I have seen many smaller counters up to 2 Ghz within reach .. but 18 GHz? I'm not sure what "ham friendly" means, but HP has had many models over the years that will hit 18GHz. Some to look for are the 5340A (very old, but good), 5350, 5351, and the rest of that family. The 5345A is good, but expensive with appropriate plugins and measurement heads. And of course the 5342A is quite a good counter. Not HP, but EIP has made many excellent microwave counters over the years, and they're readily available. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP 8662A Power up - overvoltage shutdown
Hi Tony and George,
Yes I did build up the power supply in my HP 8663A with 4 Mean Well modules. Looking back on posts I made at the time, here is some info from this post:
I have now managed to put it all back together and test it with lab power supplies, and it seems to be?working. :) It draws about 2A for both?+20V and -10V, about 0,4A for -40V and more than 10A on?+5V. But
as my power supply for the 5V is only 10A, I'm not able to get 5V, its 4
point something, and then the instrument had some issues. I was able to
push the voltage up a bit more by adding another supply in parallel,
still not quit up to spec on the voltage, but closer, and the most of
the issues where gone.
In this post, is a list of the modules I selected, and also info on the 5.2V current consumption:
And I did replace the EPROMs (2516) with AT28C15, and the current
consumption on the 5V dropped from 12.18A to 11.66A, so not very much,
but some.
In this post there is some info and pictures of the modules I used:
Regards, Askild
Agreed. That would be extremely useful.
The -40V rail's operating spec max is 0.5A - so I can increase the current dummy load I have in place by quite a way yet - I'll try that next.
thanks
Tony
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Re: anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
The best microwave counters in my view are EIP 545 or 548 series , they are nice counters and you can get them reasonable priced , EIP used a YIG filter on the microwave input which protects the sampler
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]>
On Behalf Of Tom Lee via groups.io
Sent: Wednesday, May 25, 2022 4:53 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
?
I've encountered a fair number of Autohet(Racal-Dana) microwave counters at hamfests and e-fleas for under $100. They're rack mount affairs, so not as convenient a form factor as your counter.? The more modern Racal-Dana 2101 is similar
in specs and form factor to your 5342A, so that might be worth considering. It does have a congenital design weakness, though -- the pushbuttons are crap. Replacing them is straightforward and cheap, but tedious.
If your needs would be satisfied with a top end of 14GHz or so (mine makes it to 16GHz, albeit with degraded sensitivity), you can build a divide-by-eight prescaler fairly easily, using the Hittite (now ADI) HMC363. They also have (or had) an eval board, if
you prefer pre-made over DIY. Couple that with a dirt-cheap 2GHz counter, and you'd be good to go.
--Cheers
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
On 5/25/2022 14:31, Samudra wrote:
Hi again, I am installing my HP 5342a counter, which is working, but it never came with GPIB i/f. I see the manual specifies option 001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP Input Assy.
Not wanting to spend more money into this beast (that much), are these parts unobtanium? I'm just wanting to automate certain set of measurements I plan to do. It's not do or die, just will take time to do them that's for sure.?
What's a reasonable, ham-friendly counter that does the same thing as the HP5432a nowadays? I have seen many smaller counters up to 2 Ghz within reach .. but 18 GHz??
?
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Re: anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
Hi if you are looking for a counter with GPIB then the ?questions have to be What functions do you want ? Highest frequency ? How much is in the bank for it ? counters can do more than just count for Eg Phase lock a signal generator such as a HP8620 or a HP8350 Paul ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Samudra
Sent: 25 May 2022 22:32
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents ? Hi again, I am installing my HP 5342a counter, which is working, but it never came with GPIB i/f. I see the manual specifies option 001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP Input Assy.
Not wanting to spend more money into this beast (that much), are these parts unobtanium? I'm just wanting to automate certain set of measurements I plan to do. It's not do or die, just will take time to do them that's for sure.?
What's a reasonable, ham-friendly counter that does the same thing as the HP5432a nowadays? I have seen many smaller counters up to 2 Ghz within reach .. but 18 GHz??
|
Re: anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
I've encountered a fair number of Autohet(Racal-Dana) microwave
counters at hamfests and e-fleas for under $100. They're rack mount
affairs, so not as convenient a form factor as your counter.? The
more modern Racal-Dana 2101 is similar in specs and form factor to
your 5342A, so that might be worth considering. It does have a
congenital design weakness, though -- the pushbuttons are crap.
Replacing them is straightforward and cheap, but tedious.
If your needs would be satisfied with a top end of 14GHz or so (mine
makes it to 16GHz, albeit with degraded sensitivity), you can build
a divide-by-eight prescaler fairly easily, using the Hittite (now
ADI) HMC363. They also have (or had) an eval board, if you prefer
pre-made over DIY. Couple that with a dirt-cheap 2GHz counter, and
you'd be good to go.
--Cheers
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
On 5/25/2022 14:31, Samudra wrote:
toggle quoted message
Show quoted text
Hi again, I am installing my HP 5342a counter, which is working,
but it never came with GPIB i/f. I see the manual specifies option
001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP
Input Assy.
Not wanting to spend more money into this beast (that much), are
these parts unobtanium? I'm just wanting to automate certain set
of measurements I plan to do. It's not do or die, just will take
time to do them that's for sure.?
What's a reasonable, ham-friendly counter that does the same thing
as the HP5432a nowadays? I have seen many smaller counters up to 2
Ghz within reach .. but 18 GHz??
|
anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents
Hi again, I am installing my HP 5342a counter, which is working, but it never came with GPIB i/f. I see the manual specifies option 001, with P/N?05342-60019 HP/IB Assy and P/N 05342-60029 HP/IP Input Assy.
Not wanting to spend more money into this beast (that much), are these parts unobtanium? I'm just wanting to automate certain set of measurements I plan to do. It's not do or die, just will take time to do them that's for sure.?
What's a reasonable, ham-friendly counter that does the same thing as the HP5432a nowadays? I have seen many smaller counters up to 2 Ghz within reach .. but 18 GHz??
|
Re: E4407B RYTHM Repair / Replace
Hi Bob,
I am working on my own RYTHM with some success.
Can you do the following:
Insert CW at 4GHz, -20dBm.
Apply the following settings on E4407B:
Center freq 4GHz
Span 250MHz
Resolution BW 1MHz, Video BW 1MHz
Preselector Center: Front Panel Access: AMPLITUDE/Y Scale, Presel Center
Do you get a peak of reasonable amplitude at 4GHz after this?
If you do, then your YTF polynomial might be off. I am working on a procedure for this.
Best regards
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Re: Frequency range of HP 5352B frequency counter
It could be that there is a software limit but the spec on option 05 was 46GHz so it should not be to hard to figure out
?
?
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Show quoted text
From: [email protected] < [email protected]>
On Behalf Of Dr. David Kirkby, Kirkby Microwave Ltd via groups.io
Sent: Wednesday, May 25, 2022 1:07 PM
To: HP Agilent Keysight < [email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency range of HP 5352B frequency counter
?
On Wed, 25 May 2022 at 16:49, Lothar baier <Lothar@...> wrote:
As to my knowledge option 005 was never covered by the regular service manual ,? back in my tucker days I remember seeing a addendum that was published to be added to the service
guide that covered the part# for the sub panel , dress panel , connector and cable assy as well as the specs.
Also note that the 46GHz is not a hard spec , it merely means that the unit meets a published spec for sensitivity at this point , it more than likely will work at 47 or higher
but the sensitivity will be crappy
The unit I bought arrived at my friends, but the higher frequency input was non-functional. Luckily the seller had another, which functioned okay. But there seems to be a hard limit at 43 GHz. I think it worked at 43, but not at 43.01,
suggesting there's some software stopping it from going higher in frequency, and it's not limited to the connector.?
The unit was working down to a power of -24 dBm at 43 GHz, so well within the specification of -15 dBm?@ 40 GHz.? It worked with an input of 12 mV RMS on the lower frequency range, which is much better than the 25 mV RMS specification.
That's not bad for a ?200 (around $250) frequency counter.
But I don't think without some changes outside the connector, will this count above 43 GHz - there seems to be some software limit there.
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Re: HP 3465A offset when input shorted
Another possibility is an LED. The large bandgap leads to exceptionally low leakage. Breakdown voltage shouldn¡¯t be a problem (certainly better than a 3904¡¯s b-e Zener voltage). Capacitance is high but if you don¡¯t use a large one, you should be ok here.
Just shield the LED from light. It¡¯s photovoltaic.
Cheers Tom Sent from my iThing; please forgive the typos and brevity
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Show quoted text
On May 25, 2022, at 10:45, Chris Smith <me@...> wrote:
?Got it. That's confirmed here as well. Doing too many tasks at the same time here to do any of them properly. I shall sit in the corner for a few mins with the dunce hat on!
By elimination of ideas, the JFET looks like the most sane solution now so it looks like I'll have to obtain one. I'll stick this DMM in the cupboard though until I've filled a Mouser basket.
Thanks for everyone's input on this; it was a valuable learning exercise for me :)
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Re: Frequency range of HP 5352B frequency counter
On Wed, 25 May 2022 at 16:49, Lothar baier < Lothar@...> wrote:
As to my knowledge option 005 was never covered by the regular service manual ,? back in my tucker days I remember seeing a addendum that was published to be added to the service guide that covered the part# for the sub panel , dress panel
, connector and cable assy as well as the specs.
Also note that the 46GHz is not a hard spec , it merely means that the unit meets a published spec for sensitivity at this point , it more than likely will work at 47 or higher but the sensitivity will be crappy
The unit I bought arrived at my friends, but the higher frequency input was non-functional. Luckily the seller had another, which functioned okay. But there seems to be a hard limit at 43 GHz. I think it worked at 43, but not at 43.01, suggesting there's some software stopping it from going higher in frequency, and it's not limited to the connector.?
The unit was working down to a power of -24 dBm at 43 GHz, so well within the specification of -15 dBm?@ 40 GHz.? It worked with an input of 12 mV RMS on the lower frequency range, which is much better than the 25 mV RMS specification. That's not bad for a ?200 (around $250) frequency counter.
But I don't think without some changes outside the connector, will this count above 43 GHz - there seems to be some software limit there.
Dave
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Re: HP 3465A offset when input shorted
Got it. That's confirmed here as well. Doing too many tasks at the same time here to do any of them properly. I shall sit in the corner for a few mins with the dunce hat on!
By elimination of ideas, the JFET looks like the most sane solution now so it looks like I'll have to obtain one. I'll stick this DMM in the cupboard though until I've filled a Mouser basket.
Thanks for everyone's input on this; it was a valuable learning exercise for me :)
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Re: HP 3465A offset when input shorted
On Wed, May 25, 2022 at 10:31 AM Ozan < ozan_g@...> wrote: On Wed, May 25, 2022 at 09:22 AM, Chris Smith wrote:
I did a simulation of the clamp and it clamps at 5v, both polarities which is under the 6v reverse breakdown so the thing shouldn't get zenered. It's a bit tight though!
----
When the node is clamped to let's say +5V, CR9 has (+5V-(-3.92V))=8.92V reverse bias. In the sim you should see CR8 and CR9 seeing ~ 2*3.92V+0.7V reverse bias in the extremes of the over voltage case.?
Agreed.? The anode of CR9 is held at approximately -3.92 V unless something?takes current away from CR11 and the only thing that can do that is reverse current through CR9.
Orin.
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Re: HP 3465A offset when input shorted
On Wed, May 25, 2022 at 09:22 AM, Chris Smith wrote:
I did a simulation of the clamp and it clamps at 5v, both polarities which is under the 6v reverse breakdown so the thing shouldn't get zenered. It's a bit tight though!
---- When the node is clamped to let's say +5V, CR9 has (+5V-(-3.92V))=8.92V reverse bias. In the sim you should see CR8 and CR9 seeing ~ 2*3.92V+0.7V reverse bias in the extremes of the over voltage case.? Ozan
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HP 3465A offset when input shorted
Chris Smith:
>I did a simulation of the clamp and it clamps at 5v, both polarities which is? >under the 6v reverse breakdown so the thing shouldn't get zenered.
Looking at the schematic there is indeed polarity clamps for + & - excursions using? CR9 & CR 8 going to 3.9V zenerdiodes, CR11 & CR10, that reverse bias the actual? clamping diodes?CR 8 & CR9 when not in use.
So CR 9 and CR 8 is effectively in anti parallel so zenering the B-E diode of the 2N3904?
Best regards,
Goran Finnberg
The Mastering Room AB
Goteborg
Sweden
E-mail: mastering@...
Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther
(\__/)
(='.'=)
(")_(") Ranglet, Aron, VovVov, Nero & Smurfen:RIP
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Dave McGuire
Paul Bicknell
Dr. David Kirkby, Kirkby Microwave Ltd