Re: HP 3465A offset when input shorted
Also 2N4116. They have been used for decades in unltralow current physics instrumentation for this purpose.
|
Re: 33120A ref clock input (Re: [HP-Agilent-Keysight-equipment] 53181A 3 GHz prescaler from China)
Adrian
I have a lot of these 33120A Opt 001 boards in the pipeline But it will be a few weeks before they are ready Will keep you posted (comes together with PCB's for 8903B filters)
Best Hans Eriksen
Den onsdag den 25. maj 2022 11.36.31 CEST skrev Carsten Bormann <cabocabo@...>:
On 2022-05-25, at 11:08, Adrian Godwin < artgodwin@...> wrote: > > Now what I want is a clone of the external clocking interface for the HP33120A. It's rather complex due to creating an internal 40MHz reference. > This is a clock board for the 33220A (I have one of these in my 33220A): /g/HP-Agilent-Keysight-equipment/message/96733Probably not the same as for a 33120A¡ Gr¨¹?e, Carsten
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Re: HP 8662A Power up - overvoltage shutdown
Gehard Sorry to hear of the excitement. This may help. The 8663 supply is pretty much the same. The 20 V reg is pretty simple and can be traced out if needed. But check that the 20 V is not shorted to ground. The smoke makes me think someplace in the unit a tantalum has turned very black. The supply senses current and does limit.? Good luck Paul WB8TSL
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Re: HP 8662A Power up - overvoltage shutdown
Hi all
?
Tony, the simplest explanation for your problem is that the -40VDC supply has an insufficient load on it.? What is the voltage, taken with a hand held DMM across R37, the 1R2 current sense resistor, with the power supply on say 220VAC input?? The maximum current the ¨C40VDC supply is designed to supply is 0.5A so I would expect a normal load of some 350mA.
?
Some of your other measured voltage do not make complete sense and appear to be on the low side.? For instance the service manual states that the input to the +20VDC should be over 22.5V and you show 21.66V.? Is the +5VDC supply stable with an input mains voltage between say 200VAC and 225VAC.? Have you checked the main bulk storage capacitors C2 and C3 for value and ESR?? I have not repaired a 8662A for some four years now, but in the past the first failure has always been C2 and C3.
?
Gerhard, the power supply for the 8662A and 8663A are basically the same, the full set of service manuals for the 8663A are on the KO4BB site, the power supply schematics are in volume four.
?
G Edmonds
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Re: Frequency range of HP 5352B frequency counter
On Wed, 25 May 2022 at 06:34, Lothar baier < Lothar@...> wrote:
It depends ,? the 46GHz option changed the input connector , the regular 5352 just as the 5351 used a 3.5mm male connector which will work to 40GHz with degraded specs which doesn¡¯t matter for a counter ,? the 46GHz option used a 2.4mm
male NMD connector which is good to 50GHz ,
As far as I can see from the manual, the input connector on the 46 GHz option is 3.5 mm, not 2.4 mm, which does surprise me.?
I bought the counter from eBay and had it delivered to a friend who had a 50 GHz signal generator. He found that the high frequency input is kaput, but luckily the seller has a couple more counters, so hopefully one of the 3 will work.? I reckon the also changed the cable assy as the 0.141 cable used already has a bunch of loss at 40GHz so using a 0.085 cable would have been a sensible choice .
I also know that initially HP used factory selected samplers for the 52 and 52 with 46GHz option so the 52 samplers had a different part#? , later on they scrapped the concept of having different part numbers and then just sold one part
!
Do you know at what S/N that was stopped? It would be nice if the S/N of the unit I may get was new enough that it would be suitable.
Do you know if a 46 GHz one is likely to work at 47 GHz? There¡¯s nothing of interest for me between 40 and 46 GHz, but there¡¯s an amateur band in the UK covering 47-47.2 GHz. Although I have no immediate plans to work at 47 GHz, if the counter is likely to work there, it would provide an incentive to upgrade.?
Dave -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@...Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
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Re: HP 8662A Power up - overvoltage shutdown
Hi Gerhard,
Look for service manual for the 8663A. You should find the schematic for A7A1 in service manual 4.? The 8662 and 8663 use many of the same boards.
Regards, Askild
OMG. Yesterday afternoon I did not know that A7A1 existed. Yesterday evening, I needed
yet another signal generator and had to turn to my 8662A. That one had an easy live in the
last years because of some issues. For example it worked for 0-160 MHz, did not work from
160 to 320, worked again for 320..... and so on.
Yesterday evening, I switched it on and got a black cloud of stench. I switched it off, opened it
and switched it on again for a clue where the cloud might come from.
No more cloud, but some error LEDs are on. Status == 81, which cannot happen according
to the manual. Display and keys still seem to work. +20V is missing which is probably the
reason for the error LEDs. The other voltages are still OK.
Since +23 is still there and +20 is not, the fault is probably on A7A1, the analog post regulator.
Q3, the corresponding transistor has already be changed. Brass case versus Alu of Q1 / Q2,
and someone applied some thermo paste.
But I don't have the circuit of A7A1. It seems not to be in the downloads from KO4BB.
There should be a part 2 ???
Does anybody have a cross reference of HP parts to the rest of the world?? I once had one
when I worked for a post-HP-company but failed to secure it.
The DC/DC converter seems to work. But then I see that the FR4 is brown below a fat resistor
that is located between 2 electrolytic caps in the air shadow, both discolored. Then it gets
bitter when I read in the HP journal about the specialists who ensured the culmination of
reliability, several pages.
cheers, Gerhard
(after too short a night)
|
33120A ref clock input (Re: [HP-Agilent-Keysight-equipment] 53181A 3 GHz prescaler from China)
On 2022-05-25, at 11:08, Adrian Godwin <artgodwin@...> wrote:
Now what I want is a clone of the external clocking interface for the HP33120A. It's rather complex due to creating an internal 40MHz reference.
This is a clock board for the 33220A (I have one of these in my 33220A): /g/HP-Agilent-Keysight-equipment/message/96733Probably not the same as for a 33120A¡ Gr¨¹?e, Carsten
|
Re: Frequency range of HP 5352B frequency counter
Am 25.05.2022 um 08:56 schrieb Lothar
baier:
The biggest problem you run into now in regards to upgrading a
5352B to 46GHz is finding the connector and the front/dress panel
for the option 05 units.
Option 05 did not only change the connector but since the
connector used had a different size you also had to change the
sub and dress panel on the counter!
Now if you only interested in the functionality you can
probably find a 2.4mm bulkhead connector that is long enough and
adapt it to fit in the mounting hole of the 3.5mm barrel
connector but if you want the unit to look like a option 05 unit
things get tough?
I changed the connector with PLANAR CROWN connectors.
_._,_._
|
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
|
Re: 53181A 3 GHz prescaler from China
Now what I want is a clone of the external clocking interface for the HP33120A. It's rather complex due to creating an internal 40MHz reference.
|
Re: 53181A 3 GHz prescaler from China
Mine also came from the guy in Poland : he is on eevblog. It works well and avoids the problem with self-oscillation in some prescalers (due to being a clone of the HP design ).
|
Re: HP P532A Frequency Meter Manual
Hi John
unfortunately the 12.6 to 18 Ghz wave guide parts are not that easy to find at low cost as not used by radio amateurs
The Frequency Meter is put in series with a RF signal generator and a power detector or meter on the other port when the meter is tuned to the RF signal there is a small power reduction of about 2 db or so
Paul
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Dave McGuire Sent: 24 May 2022 23:09 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] HP P532A Frequency Meter Manual On 5/24/22 17:04, johnasolecki@... wrote: I recently acquired an HP P532A frequency meter. I know it's a
resonant cavity device that goes from 12.6 GHz to 18 GHz but I don't
how or what to hookup to the two flanges to get it to work.
I've seen the Signal Path video but the unit he demos is a different
frequency range and has connectors rather than flanges. There are some
manuals and app notes on eBay but each is twice what I paid for the device.
I have signal sources and detectors in the correct frequency range, I
just need to know how to connect to the flanges. Does anyone have any info? These are "waveguide flanges". Waveguide is a common, very efficient way to move microwave energy around. See the Wikipedia article about it for an introduction. The size of a waveguide, and thus the size of its flanges, depends on the frequency of their intended use. These are (generally) standardized, and have a standardized nomenclature. Your P532A has "WR62" waveguide flanges. If you look for a WR62 waveguide to coax adapter, you should be able to find something that makes sense. For these frequencies you'll likely be working with type N, SMA, APC-7, or 3.5mm connectors. There are waveguide to coaxial cable adapters available, for different sizes of waveguide flanges. This is quite a few orders of magnitude higher in frequency than the
audio gear I normally work on... Oh this stuff is great fun. You'd better free up some space and budget, you're gonna need it! ;) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP 8662A Power up - overvoltage shutdown
Hi.
If it is (as I think you said) a switching power supply, then usually only one output rail is regulated closely by the main switching regulation loop.
The other rails rely on either close coupling between secondary windings, plus the ratio between them and the main rail, so rely on the main rail being loaded enough for the SMPS regulator to be working close to it's designed switching ratio to also be correct, loaded or not.
Or, they use the otherwise unwanted stored energy in the transformer as a "flyback" like PSU.?? Chances are that's what the -40V rail might be, especially if it is a low current rail.? Without a representative load, they can rise almost uncontrollably to much higher levels than normal running voltages, especially at higher raw input voltages.
So the higher the input voltage the higher a lightly (or un)loaded low current output may be, if it is using recovered/stored energy from a "forward converter" transformer core, much like a Flyback converter.
Try providing representative loads for all output lines, especially the main regulated rail, and see what happens then.
FYI, the accepted AC Line voltage limits in the UK these days, are essentially 230V -6% +10% (so, nominally 216V to 253V 50Hz.)
But I have seen up to 255 here and on customer sites in the past, and as low as 210V in remote places.
Take care, use a fully isolated secondary 50Hz transformer to power the device (before or after the Variac) then you can safely ground the raw DC -ve side, so as to probe the main switching side current and voltage waveforms.? But be careful, there will still be lethal voltages present!? (Sometimes well over 600V, if there is an "Active power factor correction" system included in the mix.? And they too, can behave very strangely if the overall output DC side is not loaded "as expected".)
Regards.
Dave G8KBV.
--
Created on and sent from a Unix like PC running and using free and open source software:
|
Re: Frequency range of HP 5352B frequency counter
The biggest problem you run into now in regards to upgrading a 5352B to 46GHz is finding the connector and the front/dress panel for the option 05 units.
Option 05 did not only change the connector but since the connector used had a different size you also had to change the sub and dress panel on the counter!
Now if you only interested in the functionality you can probably find a 2.4mm bulkhead connector that is long enough and adapt it to fit in the mounting hole of the 3.5mm barrel connector but if you want the unit to look like a option 05 unit things get
tough?
toggle quoted message
Show quoted text
On May 25, 2022, at 00:34, Lothar baier via groups.io <Lothar@...> wrote:
?
It depends ,? the 46GHz option changed the input connector , the regular 5352 just as the 5351 used a 3.5mm male connector which will work to 40GHz with degraded specs which doesn¡¯t matter for a counter ,? the 46GHz option used a 2.4mm
male NMD connector which is good to 50GHz , I reckon the also changed the cable assy as the 0.141 cable used already has a bunch of loss at 40GHz so using a 0.085 cable would have been a sensible choice .
I also know that initially HP used factory selected samplers for the 52 and 52 with 46GHz option so the 52 samplers had a different part#? , later on they scrapped the concept of having different part numbers and then just sold one part
!
BTW the A12 board and sampler also was used in the 83711/12 series synthesizers
?
Sent from for Windows
?
?
I was refereeing to Dave's question of upgrading a 40GHz 5352B to a 46GHz 5352B option 5.
And this is according to the posts I linked only connector and cable change.
But as also described in those posts, upgrading a 5350/1 to 5352, a resistor needs to be changed.?
?
On Wed, May 25, 2022 at 12:34 AM Lothar baier <Lothar@...> wrote:
Actually not , there were also some component changes on the A12 board between the 51 and 52 Counters , you can look at the schematics of the board to figure it out
?
?
Hi Dave,
There is some info in these posts:
Seems as the only difference is the connector and cable.
I have not yet tried to do the change to convert my 5351B to a 52. I don't have anything this high in frequency to test with.
?
On Tue, May 24, 2022 at 3:55 AM Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...> wrote:
On Tue, 24 May 2022 at 02:45, Lothar baier <Lothar@...> wrote:
Yes the 5352 was 40GHz however HP used the back panel for different models not just the 52 , the 5361B pulse counter for example had options for 26 and 40GHz and the 5352 had options
for 46GHz
Thank you. Do you know if it¡¯s possible to extend the frequency range to 46 GHz? Not that I can think of a use between 40 & 47 GHz, nut if an upgrade is possible, I might be interested.?
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Re: HP 8662A Power up - overvoltage shutdown
OMG. Yesterday afternoon I did not know that A7A1 existed. Yesterday evening, I needed
yet another signal generator and had to turn to my 8662A. That one had an easy live in the
last years because of some issues. For example it worked for 0-160 MHz, did not work from
160 to 320, worked again for 320..... and so on.
Yesterday evening, I switched it on and got a black cloud of stench. I switched it off, opened it
and switched it on again for a clue where the cloud might come from.
No more cloud, but some error LEDs are on. Status == 81, which cannot happen according
to the manual. Display and keys still seem to work. +20V is missing which is probably the
reason for the error LEDs. The other voltages are still OK.
Since +23 is still there and +20 is not, the fault is probably on A7A1, the analog post regulator.
Q3, the corresponding transistor has already be changed. Brass case versus Alu of Q1 / Q2,
and someone applied some thermo paste.
But I don't have the circuit of A7A1. It seems not to be in the downloads from KO4BB.
There should be a part 2 ???
Does anybody have a cross reference of HP parts to the rest of the world?? I once had one
when I worked for a post-HP-company but failed to secure it.
The DC/DC converter seems to work. But then I see that the FR4 is brown below a fat resistor
that is located between 2 electrolytic caps in the air shadow, both discolored. Then it gets
bitter when I read in the HP journal about the specialists who ensured the culmination of
reliability, several pages.
cheers, Gerhard
(after too short a night)
|
Re: HP 8662A Power up - overvoltage shutdown
Good chance you have an open electrolytic filter capacitor on the PSU motherboard.? From what I've seen, the supply tries valiantly to run in the presence of the resulting ripple, and it *almost* succeeds.? But the high peak-to-average ratio at the input causes the overvoltage sensor to trip. ? -- john, KE5FX ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Tony
Sent: Tuesday, May 24, 2022 5:51 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP 8662A Power up - overvoltage shutdown? Hi,
I'm hoping somebody can advise me how to approach a power-on issue with my HP 8662A signal generator.
|
Re: HP 3465A offset when input shorted
Low leakage (< a few pA) given the input impedance for the low DC volt ranges.? A 2N4117A/PN4117A diode connected FET perhaps? ?40V breakdown and 50 mA max gate current.? Horowitz/Hill in the Art of ELectronics use them as clamps - better than the commonly available 'low leakage' diodes!
I'd check the other end of CR9 - it should be around -3.9 V as CR11 is a 3.92V zener.? Also check R66 is 91K.
Orin.
On Tue, May 24, 2022 at 12:49 PM Chris Smith < me@...> wrote: Ok well that was embarrassing. I found out what was wrong with it purely by accident.
Looks like CR9 was broken. I was inspecting the area around the high impedance after the 100K carbon comp input resistor and clamp and and noticed that CR9 looked a bit suspicious. I poked the leg with my DMM probe and it fell to pieces. Not sure of the failure mode exactly but now it's out of circuit it works absolutely fine. The original role was half of a voltage clamp which makes sense with respect to the offset measured. I assume it was damaged by over-voltage or was leaking.
Picture for reference. The blob of leg is actually dangling from the broken leg by a microscopic metal fibre.?
I checked the input scale was ok by attaching a voltage source to the input terminals and measuring Q16 gate and it was exactly what was expected from the divider arrangement. It appears to zero and work fine now!
Now I can't leave it like this as it's the voltage clamp on the input so it'll probably blow up something else without it if it gets overvoltage input.
The part is 1901-0586 which appears to be a TO18 canned diode. It's not in the usual parts cross references unfortunately. Vendor is HP, spec is derived from SM as DIODE - GEN PRP 30V 25MA.? As it's got en expensive package, it smells like it might be a low leakage type, possibly a diode connected BJT or FET. Any thoughts?
|
Re: Frequency range of HP 5352B frequency counter
It depends ,? the 46GHz option changed the input connector , the regular 5352 just as the 5351 used a 3.5mm male connector which will work to 40GHz with degraded specs which doesn¡¯t matter for a counter ,? the 46GHz option used a 2.4mm
male NMD connector which is good to 50GHz , I reckon the also changed the cable assy as the 0.141 cable used already has a bunch of loss at 40GHz so using a 0.085 cable would have been a sensible choice .
I also know that initially HP used factory selected samplers for the 52 and 52 with 46GHz option so the 52 samplers had a different part#? , later on they scrapped the concept of having different part numbers and then just sold one part
!
BTW the A12 board and sampler also was used in the 83711/12 series synthesizers
?
Sent from for Windows
?
toggle quoted message
Show quoted text
From: Askild via groups.io
Sent: Wednesday, May 25, 2022 12:02 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency range of HP 5352B frequency counter
?
I was refereeing to Dave's question of upgrading a 40GHz 5352B to a 46GHz 5352B option 5.
And this is according to the posts I linked only connector and cable change.
But as also described in those posts, upgrading a 5350/1 to 5352, a resistor needs to be changed.?
?
On Wed, May 25, 2022 at 12:34 AM Lothar baier <Lothar@...> wrote:
Actually not , there were also some component changes on the A12 board between the 51 and 52 Counters , you can look at the schematics of the board to figure it out
?
?
Hi Dave,
There is some info in these posts:
Seems as the only difference is the connector and cable.
I have not yet tried to do the change to convert my 5351B to a 52. I don't have anything this high in frequency to test with.
?
On Tue, May 24, 2022 at 3:55 AM Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...> wrote:
On Tue, 24 May 2022 at 02:45, Lothar baier <Lothar@...> wrote:
Yes the 5352 was 40GHz however HP used the back panel for different models not just the 52 , the 5361B pulse counter for example had options for 26 and 40GHz and the 5352 had options
for 46GHz
Thank you. Do you know if it¡¯s possible to extend the frequency range to 46 GHz? Not that I can think of a use between 40 & 47 GHz, nut if an upgrade is possible, I might be interested.?
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Re: Frequency range of HP 5352B frequency counter
Hi Lothar,
I was refereeing to Dave's question of upgrading a 40GHz 5352B to a 46GHz 5352B option 5. And this is according to the posts I linked only connector and cable change.
But as also described in those posts, upgrading a 5350/1 to 5352, a resistor needs to be changed.?
Regards, Askild
On Wed, May 25, 2022 at 12:34 AM Lothar baier < Lothar@...> wrote:
Actually not , there were also some component changes on the A12 board between the 51 and 52 Counters , you can look at the schematics of the board to figure it out
?
?
Hi Dave,
There is some info in these posts:
Seems as the only difference is the connector and cable.
I have not yet tried to do the change to convert my 5351B to a 52. I don't have anything this high in frequency to test with.
?
On Tue, May 24, 2022 at 3:55 AM Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...> wrote:
On Tue, 24 May 2022 at 02:45, Lothar baier <Lothar@...> wrote:
Yes the 5352 was 40GHz however HP used the back panel for different models not just the 52 , the 5361B pulse counter for example had options for 26 and 40GHz and the 5352 had options
for 46GHz
Thank you. Do you know if it¡¯s possible to extend the frequency range to 46 GHz? Not that I can think of a use between 40 & 47 GHz, nut if an upgrade is possible, I might be interested.?
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Re: Frequency range of HP 5352B frequency counter
Actually not , there were also some component changes on the A12 board between the 51 and 52 Counters , you can look at the schematics of the board to figure it out
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]>
On Behalf Of Askild via groups.io
Sent: Tuesday, May 24, 2022 1:46 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency range of HP 5352B frequency counter
?
Hi Dave,
There is some info in these posts:
Seems as the only difference is the connector and cable.
I have not yet tried to do the change to convert my 5351B to a 52. I don't have anything this high in frequency to test with.
?
On Tue, May 24, 2022 at 3:55 AM Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...> wrote:
On Tue, 24 May 2022 at 02:45, Lothar baier <Lothar@...> wrote:
Yes the 5352 was 40GHz however HP used the back panel for different models not just the 52 , the 5361B pulse counter for example had options for 26 and 40GHz and the 5352 had options
for 46GHz
Thank you. Do you know if it¡¯s possible to extend the frequency range to 46 GHz? Not that I can think of a use between 40 & 47 GHz, nut if an upgrade is possible, I might be interested.?
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Dr. David Kirkby, Kirkby Microwave Ltd
Paul Bicknell
