Re: 8902a Measuring Receiver question
Hi Donald,
To calibrate the 8902 you will need an external power sensor with the calibration constants entered into the 8902, (otherwise a error will occur) and this is connected to the RF power sensor port of the 8902, to make the internal RF level measurement receiver adjust to the correct power level. This is preferably done with a HP 11722A or HP 11792A sensor. The 8902 first reads the accurate power reading thru the sensor and then reads the power thru the front connector, and then it will adjust the internal meter to match.
Pages 3-89 RF level measurement, and 3-95 Tuned RF level measurement of the operations manual show the calibration and measurement procedures.
James
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Re: Advice or a little driver help needed with an E5504A phase noise measurement system wand VXI digitizer
On Mon, Feb 27, 2023 at 04:17 PM, Ed Marciniak wrote:
ontrol panel appears to ¡°connect¡± but everything is grayed out. No beat note is detected, and until it¡¯s calibrated it won¡¯t let me open the real time view which should just be a frequency domain output from the baseband after going through a low noise amplifier to drive the ADC.
I hesitate to even considering trying source a PCI-6111 card without knowing it too won¡¯t have a similar problem. The E1430 is technically better hardware anyway.
also: I¡¯m using either an E8491B or an NI VXI-MXI-2 in slot 0, so there¡¯s no E1406A/B to provider SCPI services for register based devices.
This topic started in the VXI group, but I think here are more people using a E5500 phase noise system I have the same problem, using te E1437A digitizer. Do You write about the asset panel that comes with the VISA driver, or that in the E5500 software? I did not find an asset panel for the E1441A in the E5500 software. My system has an E1437A and an E1441A, connected via MXI-2, as Your system. Both work fine with the VISA driver, but I was never able to connect anything of the VXI stuff with the E5500 software. Not in the asset manager (connectivity test) or in the E5500 user interface itself. Not a single blink on the VXI mainframe. If I configure the E1437A into the system, and try to access it in the user interface, I get a license error. I use the license provieded from Keysight for the 000A00000 serial, which I did set into the 70420A. In the release notes in the E5500 user inteface help menu, there is a hint that the VXI devices are not covered by the generic license.
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8902a Measuring Receiver question
Can anybody tell me the correct way to make a 8902a read 1.000mW, using the internal calibrator, and a short piece of RG-213/U - mine reads 0.898mW.
Thankyou.............................Donald Collie [ZL4GX]
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I kinda used the same method as? Tom on other equipment.
But I put in saran wrap as a separator and used a Silicone hardening glue
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My go-to method for obscure connectors is to use bare contacts that fit the pins and hot glue. This method only works if the socket you are making a connector for is "watertight" or only has very small openings.
here are the steps: 1. Find contacts that fit the pins 2. Crimp contacts on to wires 3. Install contact on pins (add spacers if needed to keep separate until fixed in place) 4. Fill the socket opening with hot-glue to secure the contacts in place 5. Apply isopropyl alcohol to edge between hot glue and socket to break the bond 6. Remove the newly made connector
Another method uses shrink tube:
1. Find contacts that fit the pins 2. Crimp contacts on to wires 3. Install shrink tube over each contact 4. Insert shrink tube in to socket. Tube should be a snug fit against the wall of the socket. 5. Install contact on pins 6. Fill gaps with something (toothpicks, hot glue, shrink tube scraps...) 7. Shrink outer tube as much as you can while assembly is sill in socket 8. Remove from socket and finish shrinking outer tube
I have also has luck with 3s printing some but it is usually easier to use the above techniques for one off parts ?
I abandoned the obscure HP probe connectors entirely, and built a simple linear supply with multiple voltages and a couple of DIN connectors. It powers several different probes and low-power accessories like preamps on my bench.?
Gary NA6O
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If anyone needs to probe a 68000 or 010 in DIP, I've sketched out a simple replacement that also eliminates the need for the 01650-63203 terminators used with the official solution. Pod cables just stab right in.
?
https://github.com/GeorgeRudolf/ersatz10311
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Hello!
So I got myself an 7225B Pen plotter and I'm now looking for the manuals for this unit. I' aware that the HP Computer Museum has the stuff for the preceeding A variant but the B model is significantly different. The hand drawn B schematic someone posted there is also not of much help since there is only silkscreen for about 30 components on the board. Making finding what is described on the hand drawn schematic a chore and quite the guessing game.
If there is anyone interested in pictures I will upload those in a dedicated thread on the eevblog forum.
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Aw maaaan. And I just realized. I couldn't find the piece from the same logic family, so I tried figuring out which one is the most appropriate replacement.
So instead of the 74HC I got 74VHC. I bet their input are at least ever so slightly more sensitive.
Dangnit.
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Well, ...
I replaced all the logic chips and the dead diode and the thing works except for one new problem.
Pretty often, but not always the 20dB C stage trips the 20dB B stage too. Interestingly in both directions.
The trace for the stage 20dB C stage 22V OFF coil drive go between the pins of the stage B 5V logic, chip, right next to the control input for the OFF signal. I gave it another good scrub after noticing this to get rid of any flux residue and other debris from the rework and it seemed to help, but then I put the whole thing together, hooked it up to the VNA and the issue is back.
I might leave it like this for now. Might have to manually set the input attenuation on the spectrum analyzer to make sure it's in the right state.
Moreover this was the first time I used my 8720C VNA since I moved and I noticed that it's giving me funky results. I suspect it's my high frequency ECal module, as it looked ok with the low frequency one, but there's another can of worms to open and I haven't been able to clear this one either properly.
...le sigh...
I learned stuff. The attenuator is pretty fascinating inside. Was it worth the time tho?
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Many thanks for all your answers! I will keep investigating and I will pay attention to the sequencer ROM.
Regards,
Lionel
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Re: HP 312A wave analyser
I hope to have my cataract surgery soon, then I will be able to dig out at least four old HP counters with Nixies. I may keep one of the 5245L, because of the additional features, but I now have several HP 5334B counters and a pair of 5316B counters.
On Thu, Mar 16, 2023 at 11:36?PM Harvey White < madyn@...> wrote:
Some people would dearly love the nixies, if nothing else.? 2N404
are extremely old, but perhaps someone, somewhere, might like to
restore it.
Not surprised about Nightfire.? Turns out that you can get almost
(if not all) that they sell from Amazon, I think.
Harvey
On 3/16/2023 11:07 PM, Michael A.
Terrell wrote:
After zooming in quite a bit I see that the counter modules
are powered by -15 and +20V rails. They use 2N404 Germanium
transistors.
My HP5233 counter appears to use identical boards.It is
basically worthless, other than as a collector's item but it
has all six boards and the Nixies. It is only a 2MHz counter.
I've never powered it up, it was part of a large lot of old
test equipment that I bought over 20 years ago.I also have a
5223 (300KHz) counter from that same lot. I would need help to
dig them out of storage.
Boards from the 5245L and 5248 use the same basic circuit,
as well.
BTW, Nightfire is planning on closing their store fairly
soon.
On Thu, Mar 16, 2023 at
8:18?PM Harvey White < madyn@...>
wrote:
74 series logic is standard TTL, so 0 to 0.6 volts is a
good logic zero, and anything above 2.4 volts (preferably
3.2 to back bias an internal diode) is a logic one.? IIRC,
7447 outputs are simply saturating transistors to ground,
with the anode of the display switched on or off to enable
the digit if scanning.
Harvey
On 3/16/2023 5:27 PM, Michael A. Terrell wrote:
What about the 7441/74LS41 BCD to decimal decoder
designed to drive Nixies?
I have a 312B, which uses LED displays, with a much
simpler counter design.which uses the 74LS75 Latch and
the 74L47 BCD to seven segment decoders. The 312A
manual that I have is so speckled tht I can't read it
to determine the logic levels.
On Thu, Mar 16, 2023
at 12:57?PM Greg Muir via
<big_sky_explorer= [email protected]>
wrote:
Brad,
?
If
I can recall the neon-photocell approach was
very similar to that used in the HP 5245L
counter series display boards.? If
you can find an old board (base P/N 05212-6016)
you might have some luck in finding similar
photocell devices.? The suffix to
the part number (¡°Series 6xx¡±) changed
reflecting the board functionality.? There
was also changes in the design of these boards
where they either contained an enclosed module
termed ¡°Decoder¡± (One HP part number is
1820-1683¡±)? or a ¡°Photoconductor
Plate¡± where the photocells directly drive the
Nixie tubes.
?
It
appears that HP changed to the ¡°Decoder¡± module
in later model counters.? It is a
black plastic enclosure on the board with a
removable cover but I have never opened one up
to see what is inside.? Given its
construction I am assuming that it, too contains
photocells.
?
Greg
|
I abandoned the obscure HP probe connectors entirely, and built a simple linear supply with multiple voltages and a couple of DIN connectors. It powers several different probes and low-power accessories like preamps on my bench.?
Gary NA6O
|
Re: low amplitude readings below 10MHz on a 8591E
I agree with these comments, but watch the dc blast concept ??8591e will take some DC but not the 8590e series. ? Mike ? ? ? ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Ed Breya via groups.io
Sent: 23 March 2023 23:01
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? I'd suggest that in any SA case where the response falls off greatly toward the low end, that you have a bad/intermittent connection in the RF cabling or parts. If anything goes bad and opens up, you lose the DC/LF content, while there's still enough capacitance in place (just due to proximity - that's all it takes) to carry the RF at the upper end. The basic amplitude versus frequency envelope you see is a high-pass filter of the residual capacitance against the 50 ohms system Z.
The badness can be anywhere, in any connection or component. The most likely though, tend to be mechanically related, like contacts inside connectors, and switches such as in RF relays and attenuators, for instance. Sometimes you can cure or at least diagnose "switch" type problems by exercising them lots of times through the possible states. A good strong input signal can help too, to clean contacts. You can use any signal that's well below the maxim input power rating - even a FG or DC, if your RF sources don't have enough juice. In the case of step attenuators especially, you may need plenty of power to effectively hit the deepest/furthest back pad sections.
The recent observation that it seemed to be working again for no particular reason, then failed again, but slightly differently, is highly indicative of a marginal contact of some sort. You can expect such variable results until you find the true cause. Good luck.
Ed
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Re: low amplitude readings below 10MHz on a 8591E
Chuck,
Good to know someone has my 6
Regards
Mike
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Chuck Harris Sent: 23 March 2023 22:18 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E Hi Mike, I have zero experience with the 859XE, and am only looking over your shoulder, so to speak. It is rare to see a backup battery installed where no thought was given to how it was going to be replaced at some point in the future. Your way worked, which is pretty much all that matters. -Chuck Harris On Thu, 23 Mar 2023 18:56:01 -0000 "Mike Lockley via groups.io" <mikelockley@...> wrote: Chuck,
With the greatest respect, I soldered my new battery into my 8594e
with the power off. Mine had the newer 3.7 volt disc battery which
meant that you needed to separate the battery pcb from the
processor pcb before the work can be done. The amount of time taken
to do this completely downs the processor pcb. The restore procedure
is well documented and if you have written down (the only way) the
flatness and correction data beforehand all goes well.
best regards
Mike g4wam
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chuck
Harris Sent: 23 March 2023 18:30 To:
[email protected] Subject: Re:
[HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on
a 8591E
I must be missing something...
Aren't you already going to: "poke a soldering iron around in the
A16 pcb..." when you replace the battery?
Hand copying data onto a list, and then back from the list into
the instrument sounds like a great place to make a few mistakes...
Or, so it seems to me, as one who can effortlessly type at a rate
of over 40 errors per minute.
-Chuck Harris
On Wed, 22 Mar 2023 17:45:42 -0000 "Mike Lockley via groups.io"
<mikelockley@...> wrote:
As it is so simple to restore the data after the battery is removed
,I personally would not like to poke a soldering iron around in the
A16 pcb. That¡¯s my opinion anyway Regards
Mike g4wam
|
Re: low amplitude readings below 10MHz on a 8591E
Looks like an attenuator problem now¡ªyou can test it with a power supply? -YouTube again ? Mike ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 23 March 2023 21:08
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Ok, it failed again but it is better then before 500Khz@0dBm? is -50dBm which is better than previous < -70dBm ? Ok, Now I am truly baffled. It works now.? 1Mhz : 0dBm gives with center freq 1 Mhz and span 1 Mhz a peak of 9dBm met 10 dB attenuation. When pulling and wiggling?the cable it goes down and up. Looks like a bad connection with the Marconi. At least that's what I think.? ? Op do 23 mrt 2023 om 21:26 schreef KeesHofwegen via <radiohofwegen=[email protected]>: Gr Mike, I'll try to see what?I found so far, with the help of you and others. ? 1. The unit under test is a HP 8591E, which I received about?2 weeks ago. 2. Changing?the date and time works. 3. Freq 0Hz , span 1Mhz, with marker peak -> 12.80 dBm 4. With CAL link connected 300Mhz : -21dBm, 600Mhz: -26 dBm, 900Mhz : -21dBm, 1,2 Ghz: -25dBm, 1.5 Ghz : -27dBm, 1.8Ghz : -36 dBm ? ? with atten 10db , ref .0 dBm 5. Attaching my Marconi 2019A to it output -10 dBm ( I trust my marconi to be within 5 dBm, check it with another frequency generator? ? ? ? ?fy6900 : until 60 Mhz). Measurement on the HPis : ?6. Cal Freq passes every time. ?7? Cal amptd: fail with the CAL link connected. ? ? ?solution to make it pass: ? ? ? ? ? ?a. add marconi with 300Mhz and -20dBm to the spectrum analyser. ? ? ? ? ? ? ? ?amptd passes -> save ? ? ? ? ? ?b connect link to CAL OUT y, amptd passes -> save ?8 Confidence test: fails on reference level test : STEP GAIN/ATTEN FAIL -6000 and SQR set to 110 9. All displayed results in the tests as described in?08590-90316.pdf from page 240 to 248 are correct EXCEPT ? ?FM coil driver which shows the same line and slope but starting about the point as described by -20dbM scale ? ?so higher up the scale. 10. Changed the connector ( I use bnc cables so have a convertor plug sp?) with other plugs, and changed bnc cables. 11. The error correction numbers as shown in flatness data look like other people have when they show that data ( youtube)., ? ? ?The display shows about the same shape as the people in the youtube clips. I think that's about it for what I have found so far. 1. On youtube I see that the 0 hz level on my machine is much higher than theirs. The comb spectrum is much the same and their peak search always lands on the 300 Mhz while mine always gets the 0hz peak. 2. Some people advised?that the blocking cap on the input is at fault, I have to find out where that one is situated. I expect that it is in the attenuator?? 3. When I stepped the marconi from 1Mhz to 300 Mhz in one 1Mhz (manually,? so that's a killer)? I see a sort of exp function asymptotically going to the correct level around 300Mhz.? Gr Kees, That¡¯s ok then. Perhaps to recap what you have found and what problem you still have ? Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 23 March 2023 19:10
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi Mike, I measured the battery,?3.69 volt so it is still good. ? Gr Kees, There 2 battery types ¨Ccylindrical and disc shaped. The older is cylindrical ¨Cit will probably be on its last gasps so check the voltage before you remove it. It is not backed up by a charger circuit., therefore when you change it you will lose all the factory set up data so make sure you read through the restore pages procedure and have all the data to hand, The options if you have any will recover themselves? except for the gate option ¨Cbut I have the restore procedure for that. ? ? Regards Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 21 March 2023 20:09
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? HI Mike, battery date almost not readable but it looks like the last part of the year is 32 so should?be 83, 93 so I'll replace it after viewing some video's. After replacement I'll see what the state is like. The moisture in the shed is never above 60% so no moisture issues. ? Gr Kees, ? My ?observation from what you are saying is that the unit is getting too cold ¨Cthese units should be at room temp all the time. The YTO LO does not like getting towards condensation levels ¨Cthey have no heater built in to the YIG assy. Also, what is the state of the internal 3.7v battery? There should be a date on the back of the SA with the replacement date . If the battery is failing or failed? you will get CAL fail problems There is a lot of info on YouTube about battery replacement. ? Regards Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 21 March 2023 18:24
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? hi Mike, CAL FREQUENCY passes yes CAL AMPTD ¨Cpasses with CAL link in place? After switching it on tonight? ( sched was about 13 C) it failed, but with the marconi 300Mhz at -20dBm it did, after that with? the CAL link it passed?the amptd?CAL ? CONFIDENCE TEST? ? STEP GAIN ATTEN FAIL -6000? SQR 110 ? Will do it again after a 1 hr warmup ? Gr. Kees ? ? That suggests a very strong LO? signal ¨Ca good thing so probably not a YTO fault, Just to clarify.. ? CAL FREQUENCY passes CAL AMPTD ¨Cpasses with CAL link in place? CONFIDENCE TEST? ? ? Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 20 March 2023 19:50
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi Mike its? 10dBm above the ref lvl. with 10 db ATTEN ? Gr Kees, Did you take a look at the 0hz feedthrough amplitude ¨C(left side of display) What value ?is it? Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 20 March 2023 19:28
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi Mike, I've backup the constants ( paper) and used my marconi frequency?generator?to have the amptd NOT fail. After that the cal signal of the 8591E was used to do an amptd again and this time it succeeded. Still the lower end is terrible ( low amplitude ). I've done the service diag and? 1. the MAIN Coil driver?is much steeper and starts higher at the -20dbm horizontal line? The rest has the same picture as shown in the?8590-90316 manual. So according to the manual it's in the A7 board. does somebody have a spare will to sell ? Hi ?in your case ?from 238-247 if you haven¡¯t done it already? ..201 onwards? ?backing up correction constants ? One thing to check is the level of your LO feedthrough amplitude ?..the signal at 0hz on the left hand edge of the display Do frequency 0hz? span 1mhz¡ and see what the level of the LO is? --good ones are around -10db or better. ? By the way you¡¯re 8591? is a bit different on the front end than the 8590e series , yours is more prone to mixer failure but can be fixed . Lots of info on you tube ? Regards Mike g4wam ? ? ? ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 18 March 2023 17:47
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ?
got it and will start reading.?
Any recommendations about what paragraph? ? You need 08590-90316? from? 2001 8590 series Service Guide ? Are large tome but worth downloading or buying ¸é±ð²µ²¹°ù»å¡¯²õ Mike g4wam ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 18 March 2023 14:41
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi, Are we talking about the user manual 08590-90301, because there is not much cal data in it other than the normal stuff. I also have the installation, verification & Operation manual. Or are there other manual I need?
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Re: low amplitude readings below 10MHz on a 8591E
Gr Kees, The link is needed to pass the CAL for various reasons, the 600mhz and 10Mhz are tested as well as the attenuator output and the YTO output. I also use my trusted Marconi 2019a ?-usually within ?1db or so of the HP8594e across its range.. The YTO is very strong but that¡¯s good, it should last a long time. My personal view is that you have an input attenuator problem? or? a cable fault! ? You need to do that 1mhz to 300Mhz test aging with a new cable and see what values you get. ? Remember that the 8591 e? has rather different front end than the 8690e series so worth getting a look at the block diagram ¨Cthey are on line to download. ? Regards Mike ? ? ? ? ? ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 23 March 2023 21:01
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Ok, Now I am truly baffled. It works now.? 1Mhz : 0dBm gives with center freq 1 Mhz and span 1 Mhz a peak of 9dBm met 10 dB attenuation. When pulling and wiggling?the cable it goes down and up. Looks like a bad connection with the Marconi. At least that's what I think.? ? Op do 23 mrt 2023 om 21:26 schreef KeesHofwegen via <radiohofwegen=[email protected]>: Gr Mike, I'll try to see what?I found so far, with the help of you and others. ? 1. The unit under test is a HP 8591E, which I received about?2 weeks ago. 2. Changing?the date and time works. 3. Freq 0Hz , span 1Mhz, with marker peak -> 12.80 dBm 4. With CAL link connected 300Mhz : -21dBm, 600Mhz: -26 dBm, 900Mhz : -21dBm, 1,2 Ghz: -25dBm, 1.5 Ghz : -27dBm, 1.8Ghz : -36 dBm ? ? with atten 10db , ref .0 dBm 5. Attaching my Marconi 2019A to it output -10 dBm ( I trust my marconi to be within 5 dBm, check it with another frequency generator? ? ? ? ?fy6900 : until 60 Mhz). Measurement on the HPis : ?6. Cal Freq passes every time. ?7? Cal amptd: fail with the CAL link connected. ? ? ?solution to make it pass: ? ? ? ? ? ?a. add marconi with 300Mhz and -20dBm to the spectrum analyser. ? ? ? ? ? ? ? ?amptd passes -> save ? ? ? ? ? ?b connect link to CAL OUT y, amptd passes -> save ?8 Confidence test: fails on reference level test : STEP GAIN/ATTEN FAIL -6000 and SQR set to 110 9. All displayed results in the tests as described in?08590-90316.pdf from page 240 to 248 are correct EXCEPT ? ?FM coil driver which shows the same line and slope but starting about the point as described by -20dbM scale ? ?so higher up the scale. 10. Changed the connector ( I use bnc cables so have a convertor plug sp?) with other plugs, and changed bnc cables. 11. The error correction numbers as shown in flatness data look like other people have when they show that data ( youtube)., ? ? ?The display shows about the same shape as the people in the youtube clips. I think that's about it for what I have found so far. 1. On youtube I see that the 0 hz level on my machine is much higher than theirs. The comb spectrum is much the same and their peak search always lands on the 300 Mhz while mine always gets the 0hz peak. 2. Some people advised?that the blocking cap on the input is at fault, I have to find out where that one is situated. I expect that it is in the attenuator?? 3. When I stepped the marconi from 1Mhz to 300 Mhz in one 1Mhz (manually,? so that's a killer)? I see a sort of exp function asymptotically going to the correct level around 300Mhz.? Gr Kees, That¡¯s ok then. Perhaps to recap what you have found and what problem you still have ? Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 23 March 2023 19:10
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi Mike, I measured the battery,?3.69 volt so it is still good. ? Gr Kees, There 2 battery types ¨Ccylindrical and disc shaped. The older is cylindrical ¨Cit will probably be on its last gasps so check the voltage before you remove it. It is not backed up by a charger circuit., therefore when you change it you will lose all the factory set up data so make sure you read through the restore pages procedure and have all the data to hand, The options if you have any will recover themselves? except for the gate option ¨Cbut I have the restore procedure for that. ? ? Regards Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 21 March 2023 20:09
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? HI Mike, battery date almost not readable but it looks like the last part of the year is 32 so should?be 83, 93 so I'll replace it after viewing some video's. After replacement I'll see what the state is like. The moisture in the shed is never above 60% so no moisture issues. ? Gr Kees, ? My ?observation from what you are saying is that the unit is getting too cold ¨Cthese units should be at room temp all the time. The YTO LO does not like getting towards condensation levels ¨Cthey have no heater built in to the YIG assy. Also, what is the state of the internal 3.7v battery? There should be a date on the back of the SA with the replacement date . If the battery is failing or failed? you will get CAL fail problems There is a lot of info on YouTube about battery replacement. ? Regards Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 21 March 2023 18:24
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? hi Mike, CAL FREQUENCY passes yes CAL AMPTD ¨Cpasses with CAL link in place? After switching it on tonight? ( sched was about 13 C) it failed, but with the marconi 300Mhz at -20dBm it did, after that with? the CAL link it passed?the amptd?CAL ? CONFIDENCE TEST? ? STEP GAIN ATTEN FAIL -6000? SQR 110 ? Will do it again after a 1 hr warmup ? Gr. Kees ? ? That suggests a very strong LO? signal ¨Ca good thing so probably not a YTO fault, Just to clarify.. ? CAL FREQUENCY passes CAL AMPTD ¨Cpasses with CAL link in place? CONFIDENCE TEST? ? ? Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 20 March 2023 19:50
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi Mike its? 10dBm above the ref lvl. with 10 db ATTEN ? Gr Kees, Did you take a look at the 0hz feedthrough amplitude ¨C(left side of display) What value ?is it? Mike ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 20 March 2023 19:28
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi Mike, I've backup the constants ( paper) and used my marconi frequency?generator?to have the amptd NOT fail. After that the cal signal of the 8591E was used to do an amptd again and this time it succeeded. Still the lower end is terrible ( low amplitude ). I've done the service diag and? 1. the MAIN Coil driver?is much steeper and starts higher at the -20dbm horizontal line? The rest has the same picture as shown in the?8590-90316 manual. So according to the manual it's in the A7 board. does somebody have a spare will to sell ? Hi ?in your case ?from 238-247 if you haven¡¯t done it already? ..201 onwards? ?backing up correction constants ? One thing to check is the level of your LO feedthrough amplitude ?..the signal at 0hz on the left hand edge of the display Do frequency 0hz? span 1mhz¡ and see what the level of the LO is? --good ones are around -10db or better. ? By the way you¡¯re 8591? is a bit different on the front end than the 8590e series , yours is more prone to mixer failure but can be fixed . Lots of info on you tube ? Regards Mike g4wam ? ? ? ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 18 March 2023 17:47
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ?
got it and will start reading.?
Any recommendations about what paragraph? ? You need 08590-90316? from? 2001 8590 series Service Guide ? Are large tome but worth downloading or buying ¸é±ð²µ²¹°ù»å¡¯²õ Mike g4wam ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen
Sent: 18 March 2023 14:41
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on a 8591E ? Hi, Are we talking about the user manual 08590-90301, because there is not much cal data in it other than the normal stuff. I also have the installation, verification & Operation manual. Or are there other manual I need?
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Re: E4407B option AYX Fast Sweep Time Domain
Hi,
I worked on it today, and I found the fault: two op amps were defective.
I was able to test them out of circuit for confirmation.
The problem of not having a picture on the screen was mainly caused by the
fact that the DC voltage applied to the signal was not within the range of
the ADC AD9050, the 10 output bits of the ADC were all at logic 0.
I ordered the parts, but I'm not sure if there are other defective parts, I
will make this first replacement, I will see for the continuation.
I am not sure if the ADC is not damaged, removing these two circuits and
retesting the board, I saw noise on the screen because the voltages at the
ADC inputs are identical and in the normal range of the AD9050 component.
However, the noise had a high amplitude...I will be soon if there is still a
problem.
Thank you for responding.
Yves Tardif
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-----Message d'origine----- De?: [email protected]< [email protected]> De la part de Don Bitters via groups.io Envoy¨¦?: 23 mars 2023 17:56 ??: [email protected]Objet?: Re: [HP-Agilent-Keysight-equipment] E4407B option AYX Fast Sweep Time Domain Is there an intensity adjustment for the faster sweep times? The 8566 has such an adjustment on the video cards. Try cranking the intensity up for faster sweep times to see if the trace is visible, if yes then you have a fast sweep intensity problem. Don Bitters
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Re: HP 8656B display issue
I would suspect an IC in the IF A3 video section. It sounds like a stuck bit. Part of the A3 section deals with the text and graphics. I believe that it is probably in the A3A1 ->A3A4 (video memory brd.). Check the ribbon cable connects to this A3 section, the traces on the A3 mother board. Do read the A3 section theory of operation, then read the individual A3 brd. that the section theory of operation points to. I think you will be able to isolate the problem board inside of 2 hrs., then localize to a circuit area. An oscilloscope will show TTL activity and proper levels on the data lines. Any levels other than +5V and 0V (or acceptable TTL levels) on data lines will be a problem.
Do check the power supply lines on each of the A3 section brds. as each brd. has filter caps on each brd. - tantalum in most cases. HP used a distributed filter cap approach to their power supply design.
Don Bitters
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Re: low amplitude readings below 10MHz on a 8591E
I'd suggest that in any SA case where the response falls off greatly toward the low end, that you have a bad/intermittent connection in the RF cabling or parts. If anything goes bad and opens up, you lose the DC/LF content, while there's still enough capacitance in place (just due to proximity - that's all it takes) to carry the RF at the upper end. The basic amplitude versus frequency envelope you see is a high-pass filter of the residual capacitance against the 50 ohms system Z.
The badness can be anywhere, in any connection or component. The most likely though, tend to be mechanically related, like contacts inside connectors, and switches such as in RF relays and attenuators, for instance. Sometimes you can cure or at least diagnose "switch" type problems by exercising them lots of times through the possible states. A good strong input signal can help too, to clean contacts. You can use any signal that's well below the maxim input power rating - even a FG or DC, if your RF sources don't have enough juice. In the case of step attenuators especially, you may need plenty of power to effectively hit the deepest/furthest back pad sections.
The recent observation that it seemed to be working again for no particular reason, then failed again, but slightly differently, is highly indicative of a marginal contact of some sort. You can expect such variable results until you find the true cause. Good luck.
Ed
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Re: low amplitude readings below 10MHz on a 8591E
Hi Mike, I have zero experience with the 859XE, and am only looking over your shoulder, so to speak. It is rare to see a backup battery installed where no thought was given to how it was going to be replaced at some point in the future. Your way worked, which is pretty much all that matters. -Chuck Harris On Thu, 23 Mar 2023 18:56:01 -0000 "Mike Lockley via groups.io" <mikelockley@...> wrote: Chuck,
With the greatest respect, I soldered my new battery into my 8594e
with the power off. Mine had the newer 3.7 volt disc battery which
meant that you needed to separate the battery pcb from the
processor pcb before the work can be done. The amount of time taken
to do this completely downs the processor pcb. The restore procedure
is well documented and if you have written down (the only way) the
flatness and correction data beforehand all goes well.
best regards
Mike g4wam
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chuck
Harris Sent: 23 March 2023 18:30 To:
[email protected] Subject: Re:
[HP-Agilent-Keysight-equipment] low amplitude readings below 10MHz on
a 8591E
I must be missing something...
Aren't you already going to: "poke a soldering iron around in the
A16 pcb..." when you replace the battery?
Hand copying data onto a list, and then back from the list into
the instrument sounds like a great place to make a few mistakes...
Or, so it seems to me, as one who can effortlessly type at a rate
of over 40 errors per minute.
-Chuck Harris
On Wed, 22 Mar 2023 17:45:42 -0000 "Mike Lockley via groups.io"
<mikelockley@...> wrote:
As it is so simple to restore the data after the battery is removed
,I personally would not like to poke a soldering iron around in the
A16 pcb. That¡¯s my opinion anyway Regards
Mike g4wam
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Michael A. Terrell
