Re: 16900A cleanup and modernization experience including installation notes!
On Sun, Mar 24, 2019 at 11:45 AM Keith Monahan via Groups.Io <keith@...> wrote:
* The Adlink 815G industrial motherboard(Note earlier versions used a
different mobo) that the system is based on doesn't support SATA
natively. I added a QNINE(some off-brand Chinese) Sil3114-based 4-port
card from Amazon. The card specifically supports Windows XP, and I
believed the drivers to be already installed. They definitely were not!
* Getting XP to boot off the SSD was a nightmare. Windows kept blue
screening a STOP 0x0000007B error, which means Inaccessible Boot Device.
The Award BIOS 6.00PG present had no real relevant options to help, and
does not see the HDD present, even after getting it work.
I don't remember having any problems when I tried using a Buslink SPCI2P PCI-SATA card, which uses the Sil3112A. It might be that the drivers are only preinstalled for that particular PCI device, and not any other versions of Silicon Image PCI-SATA bridge chips. I'd have to get set up to try the recovery installation process again to verify that. * After getting the machine to boot, I updated to Service Pack 3 using
the Microsoft downloadable EXE, and then installed the Keysight Logic
Analyzer 5.90 application. That installer needs to install .NET 3.51 and
.NET 4.00 and this takes A LOOOOOOONG time. It also installs the Windows
XP drivers(both of them, there's two) to support the PCI card which
talks to the modules. Yes, you want to update to XP SP3, then install the .NET packages so you can install the version 05.90.1104 analyzer application software. The .NET package installation is one of the longest parts of the whole system setup from scratch. A set up from scratch on a bare hard drive can take a few hours to get everything installed. * The USB ports are version 1.1 by the best I can tell. Using flash
drives are painfully the slow. My chassis had the gigabit ethernet card
which is MUCH MUCH faster for doing samba transfers. Note that some
modern samba installations (I'm looking at you Ubuntu) turn of NTLM and
lanman hashes, which means that you need to re-enable support to be able
to connect --- otherwise your passwords fail when trying to connect! I picked up a few new bulk package Adaptec AUA-5100B PCI USB 2.0 cards cheap on eBay. Those use the NEC uPD720101 (now Renesas), which is one of the better USB 2.0 controllers from what I remember from my USB development days. No problem getting that to work in the 16900A with the preinstalled drivers. The Adaptec AUA-2000C appears to use the same uPD720101 and those are also cheap in new bulk package condition on eBay. I believe GBit Ethernet card is just a standard Intel PRO/1000 XT PCI-X card, plugged into a 32-bit slot, with a low profile bracket. * I am surprised at just how much this thing is just a regular of-era
Windows XP PC. All the normal PC-like things apply, and I'm convinced
that you could use a more modern PC, more modern (but still 32-bit!!!)
operating system, and really get this thing humming. I'm not sure
there's an obvious benefit, because this LA is plenty usable in its
current form. But for fun, who knows? I think there's threads on eevblog
about this! I wasn't really into trying to hot rod my 16900A. A motherboard swap would be a mechanical challenge due to the motherboard I/O cutouts being integrated into the motherboard tray instead of using a replaceable pop-in/out I/O shield you could change to match a different motherboard. As I already mentioned previously you can use the 16900A mainframe CPU as just a server for the acquisition modules and run the analyzer application remotely on a much faster system over the GBit Ethernet. One thing I did do is install an add-in AGP graphics adapter. Nothing fancy, just wanted DVI output. I think it was an older passively cooled VisionTek Radeon 7K. That's somewhat period appropriate for a Windows XP system. There might have already been drivers preinstalled so I didn't have to install any vendor driver crapware. One limitation with the 16900A is only 3 PCI slots (1 shared with the AGP slot). So you can have only 3 of a GBit Ethernet card, a USB 2.0 card, a PCI-SATA card, and a PCI/AGP graphics card, if you are into trying to max out the system.
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Re: 8753ES YTO freq vs. Main Coil mA
I don't know if this will help, but here goes.
First, don't worry about the apparent offset in coil tuning current. YTOs are only specified to operate over a certain range, like an octave or two, but can run a ways beyond at either end. It doesn't help (other than mathematically to get the tuning chart numbers) to extrapolate down to zero coil current - the YTO will stall out somewhere a little below its lowest spec frequency and coil current. Any slope variations or offsets extrapolated at zero just represent the character of the magnetic structure in the YTO.
The proper range, slope, and offset needed for tuning a particular YTO are typically handled by the YTO driver circuit, which can make it so the net result is a nice convenient GHz/V type system, at its input. There are usually sufficient adjustments (pots and/or DAC settings) in the driver circuitry to accommodate the tolerances of the YTO, the 3.8 GHz oscillator in this case, and the rest of the parts, to make everything come out right, during calibration.
There may be circuitry included to improve the tuning linearity (due to magnetic saturation), and compensate for the dynamic response (magnetic delay and hysteresis). Ideally, the YTO frequency is perfectly and instantly proportional to the magnetic field, but in reality the field depends on an iron core, coil inductance, AC core losses, and so forth.
The FM coil may be used in a PLL, for fine tuning. Its effect is very small (but much faster), compared to the main coil. It too has to be properly driven, of course.
In a down-converting generator made for reaching low frequency, it would normally be set up to avoid spectral inversion - that's why there's a minimum output frequency that can be expected. If the 3.8 GHz LO is free-running, its drift may be enough to limit how far down you can go at the low end, regardless of the YTO's tuning precision. For sources that can get way down toward zero (DC even), both the LO and YTO need to be precisely controlled (synthesized).
The coarse and fine tuning, compensation, and calibration all contribute to successful operation, so there may be quite a few possible suspects.
If you have schematics, you should be able to find all of these elements, and track down the proper conditions for diagnostics and repair.
Good luck.
Ed
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Re: 8753ES YIG oscillator circuit WCA
Did you do the cavity oscillator correction, test 54, using the low pass filter? I know we talked about it, but I want to make sure this setting is correct. This is normally a firmware correction, you shouldn't have to touch the tuning screw unless someone played with it before you got the analyzer.
Vladan
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16900A cleanup and modernization experience including installation notes!
I purchased a fully loaded 16900A for quite a bargain recently. It has (1) 16950B, 16M, 667MHZ state mode, and 4ghz timing zoom module. It also has (5) 16910A's, 16M option, 500MHZ state mode option. The 16950B is 68-channels, and the 16910A's are 102-channels. I wasn't a math major, but that's almost 600-channels of simultaneous capture.
A couple friends asked, what are you going to do with all those channels? While truthfully I don't know, I can certainly do whatever the heck I'd want to do with this beast!
Several notes of my getting this thing back online:
* I am amazed, that for a 12-year old unit (my best guess as to the age), at how clean this thing was inside and out. Very, very little dust. I wonder if it spent most of it's life in a clean room.
* I believe this was used at the famous CPU manufacturer to develop and test then current CPU.
* The excellence of the design is obvious throughout the entire product. The CPU tray is simply a module, which is mounted on rails, which allows for removal/replacement/changes without removing any modules. The backplane connectors have guide-posts to ensure proper alignment. All cables are zip-tied, sometimes sleeved, and the thing is solid as a brick dunny. I can't get over how nicely everything fits together.
* I replaced the spinning HDD with a modern SSD. I'm sure the CPU/chipset/mobo can't handle or take advantage of the speed, but a newer replacement was necessary for continued reliability. The 80GB Hitachi Deskstar(!!) passed LONG SMART tests, and continues to function fine.
* The Adlink 815G industrial motherboard(Note earlier versions used a different mobo) that the system is based on doesn't support SATA natively. I added a QNINE(some off-brand Chinese) Sil3114-based 4-port card from Amazon. The card specifically supports Windows XP, and I believed the drivers to be already installed. They definitely were not!
* Getting XP to boot off the SSD was a nightmare. Windows kept blue screening a STOP 0x0000007B error, which means Inaccessible Boot Device. The Award BIOS 6.00PG present had no real relevant options to help, and does not see the HDD present, even after getting it work.
* The keysight-provided recovery DVD includes scripts that use Norton Ghost to restore the hard drive to factory condition. The problem is that because it's not a normal full-XP install, you can't inject alternative SATA drivers at any point, and you'll end up with the dreaded 0x7B again. It's interesting that the restore DVD and ghost can see and reimage the SSD via SATA without help, but the XP install can't.
* There are a couple ways to fix this 0x7B problem. First, you can do what's called "slipstreaming" where you create an XP install disk using a regular XP disks, combine your SATA drivers, and then boot off the newly created disk. See the free tool nlite (not the similar sounding newer pay tool). The issue with this is that you end up with a non-standard Agilent install. This will still work, however.
* What I did was this: use Keysight recovery DVD to image the SSD with the official XP SP2 image. Then, using a normal Windows XP SP2 OS installation CD, I performed a repair (not using the recovery console) and simply chose the existing install, and reinstalled Windows XP SP2. This preserved the existing installed programs, screensavers, boot options, drivers, and so on. Prior to this step, I put my SATA drivers on floppy disk, and attached via USB Floppy drive, and chose F6 to load them during the re-setup. Important note: when you see the "Insert manufacturer supplied driver disk" message, and press S, and then enter, simply nothing appears to happen! You must continue through the process by processing ENTER to continue, and then you'll see your floppy go active, and a setup text indicating your drivers are being used! It's very intuitive)
* Another note: not all USB-attached floppies drivers are recognized by the XP installer. You need to either use one of the ones listed in the TXTSETUP.SIF file (search for USBSTOR) or manually add an entry for your drive.
* After getting the machine to boot, I updated to Service Pack 3 using the Microsoft downloadable EXE, and then installed the Keysight Logic Analyzer 5.90 application. That installer needs to install .NET 3.51 and .NET 4.00 and this takes A LOOOOOOONG time. It also installs the Windows XP drivers(both of them, there's two) to support the PCI card which talks to the modules.
* The USB ports are version 1.1 by the best I can tell. Using flash drives are painfully the slow. My chassis had the gigabit ethernet card which is MUCH MUCH faster for doing samba transfers. Note that some modern samba installations (I'm looking at you Ubuntu) turn of NTLM and lanman hashes, which means that you need to re-enable support to be able to connect --- otherwise your passwords fail when trying to connect!
* I am surprised at just how much this thing is just a regular of-era Windows XP PC. All the normal PC-like things apply, and I'm convinced that you could use a more modern PC, more modern (but still 32-bit!!!) operating system, and really get this thing humming. I'm not sure there's an obvious benefit, because this LA is plenty usable in its current form. But for fun, who knows? I think there's threads on eevblog about this!
I'll be writing a future blog post on my blog about this with full pictures and links.
I just thought I'd share.
Thanks!
Keith
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Re: 8753ES YTO freq vs. Main Coil mA
I found that the 34401A had excessive internal resistance while in the loop so redid the YTO measurements using instead a 0.102 ohm shunt resistor.? I had redone the chart but flipped it so the trend line would show mA/GHz directly (attached).? This doesn't show the MHz offset directly but the linearity of the YTO is remarkable.? I have to run out and do some errands but later today I will check the output to the FM coil.? However, a NOS replacement phase lock board behaves identically so I don't expect to see this as a board fault.
In the analysis I posted earlier, I calculated the worst case tolerance stack up both positive and negative.? The firmware would have to be able to handle this range.
Peter
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On 3/24/2019 1:34 PM, pianovt via Groups.Io wrote: Hi Peter,
Your plot shows? y = 0.0444x + 0.0656. So, there is a 65.6 MHz offset at 0 mA main coil current. This could in part be caused by a FM coil current which does not show up across the 40 Ohm resistor. Basically, I think you have confirmed that your YTO works and produces an output well below 3.8 GHz. The only exception to this statement would be a case where the YTO stops working in a narrow range of frequencies, but that almost always happens near the very low end of the oscillator's range (well below 3.8 GHz).
The question now is, how to allocate the 65.6 MHz offset. How much of it is due to some FM coil current and how much is due to some other problem. Keep in mind what I said about the FM coil current, it should not exceed 150 mA, which corresponds to approximately 35 MHz tuning range in either direction. I guess, I would somehow check to make sure the coil isn't being fried with too much current.
I have no idea how the firmware deals with pretune constants in CW mode and/or PLL off.
Vladan
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Sometimes, things have a way of falling into your lap. After the discussion about power meters in my prior thread about the 8664A sig gen, I strolled into my local surplus house and I found this beautiful condition 431B power meter for dirt cheap. Sadly, however, it's missing all the accessories. And those thermistor mounts are not exactly cheap on ebay...try some 16 times what I paid for the meter itself.
Does anyone know where I can find a line cord to fit it? I found the operating and service manual, and I'd like to get it back to operating condition. I'll have to save to get at least a coax thermistor mount.
Sean
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8753ES YIG oscillator circuit WCA
One of the most challenging troubleshooting endeavors is when there is a misbehaving analog circuit where insufficient or vague limits are specified in the service documentation.? I have such a situation with my 8753ES in the phase lock circuit.
The pretune test waveform shown in the service guide differs from what I see by an offset.? A replacement phase lock board also has such an offset, and it came in a sealed envelope from the factory.
A complicating factor is that the instrument will sometimes "automatically" recalculate the pretune values when there is a failure detected during sweep, so by the time you can get to the test waveform you cannot be entirely sure if you are seeing the default pretune values, corrected pretune values, or partially corrected pretune values after a failed internal cal routine (test 48).? The best way to find out is to go into source tune mode where the instrument displays the DAC values and tune to 300 kHz.? If you see a DAC value of 1019 then at least at that frequency you are seeing the default value.
I decided I would do a Worst Case Analysis of the drive circuit when the DAC is set to 1019 (decimal).? If anyone is interested in the details I can discuss that but a summary is as follows:
1)? I assumed no selected values, that all components are of the tolerance in the HP parts list for the board as shown in the 8753D CLIP (same board part number used in the 8753ES).
2)? The 6.2 volt reference Zener has a tolerance of 2%.
3)? The voltage shift and buffer amps use resistors with 0.1% tolerance.
4)? The current sense resistor is 1%.
5)? The current to voltage converter is closed loop and has negligible error.
6)? The DAC has a +/- 1 LSB error, and at 12 bits, that's about 0.025% so I ignored it in this analysis.
7)? The YIG oscillator per Vladan is 23 +/- 1 mA/GHz.
8)? Component tolerances were arranged to form worst case combinations to make the extremes and still be at the edge of spec.
9)? I assumed the 3.8 GHz oscillator had no error.? The tolerance of this will add to these WCA numbers.
The end result is that the uncorrected output frequency of the source using the default DAC pretune value at a setting of 300 kHz will be -217 to +368 MHz.? Note the negative value.? The firmware will have to comprehend that increasing the DAC value will cause a decrease in output frequency and act accordingly.
The pretune 1 V/GHz output at the default DAC setting of 1019 can be from 3.474 to 3.631 volts with a nominal of 3.552 volts.? Thus my apparently shifted output is completely normal and in spec.? Those who see lower shifted outputs are most likely seeing corrected values where the DAC is no longer at 1019.? Both of my phase lock boards are well within these limits with the largest error contribution being the Zener.? My YTO, after doing a more careful series of measurements, comes out to be 22.251 mA/GHz, also within spec.? I took measurements of the second YTO and they look close but haven't done the curve fit to know the actual sensitivity.
So this leaves me with the same mystery as when I started:? why is my unit failing test 48 when all the tests in the troubleshooting guide seem to give good results?*
(* with some slight exceptions depending on how the tests are performed)
Peter
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Re: HP5335A fan replacement
Dr. David Kirkby from Kirkby Microwave Ltd
LOn Tue, 19 Mar 2019 at 8:18 pm, Dan Nessett via Groups.Io <dnessett= [email protected]> wrote: The specs for the?Pabst fan that comes with the HP5335A are:?34 dBA, 61 m3/hour. The specs for the Evercool fan are: 28 dBA, 55 m3/hour. So, the Evercool is a bit underpowered, but considerably quieter than the?Papst. From what I have read the?Papst fan is a bit?over spec'd in?terms of airflow, so I thought the Evercool fan might work fine.
The flow rates you quote are probably in free air. Back pressure will reduce that considerably. You can pretty much ignore the free air figures. They should impressive, but have little connection with reality.
You will detect a 6 dB difference in noise, but the difference will not be considerable. It will not appear 4 times as loud. In fact, a 3 dB difference is just about percectable.?
Dave. -- Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
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Re: 8753ES YTO freq vs. Main Coil mA
Hi Peter,
Your plot shows? y = 0.0444x + 0.0656. So, there is a 65.6 MHz offset at 0 mA main coil current. This could in part be caused by a FM coil current which does not show up across the 40 Ohm resistor. Basically, I think you have confirmed that your YTO works and produces an output well below 3.8 GHz. The only exception to this statement would be a case where the YTO stops working in a narrow range of frequencies, but that almost always happens near the very low end of the oscillator's range (well below 3.8 GHz).
The question now is, how to allocate the 65.6 MHz offset. How much of it is due to some FM coil current and how much is due to some other problem. Keep in mind what I said about the FM coil current, it should not exceed 150 mA, which corresponds to approximately 35 MHz tuning range in either direction. I guess, I would somehow check to make sure the coil isn't being fried with too much current.
I have no idea how the firmware deals with pretune constants in CW mode and/or PLL off.
Vladan
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Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
Hi The battery backuped ram (M48Z18) in my HP 54645 died on me.. I desoldered it, put in a socket.? Then I fixed the ram by heating it a bit, and pry it open. Removed the old battery, and soldered on a big lithium cell, looks like the same type as seen 90's PCs. See picture... Should last a very long time.?
Br, Askild
On Sun, 24 Mar 2019, 17:47 Reginald Beardsley via Groups.Io, <pulaskite= [email protected]> wrote: The Tek 11801 has 4 Panasonic BR 2/3 A? 1200 mAh? 3 V lithium cells.? All of those tested at 3.07 to 3.1 V despite manufacturing dates of 12-87 and 09-88.? I think the fundamental issue with the NVRAM is the cells are too small.? The ST? battery caps for the SMD parts have a choice of 40 or 120 mAh capacities.
Once I get my replacements I'll try to reverse engineer the circuit in the NVRAM sockets.
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Re: My $25 "In Poor Shape" 3468A has arrived
On Sat, Mar 23, 2019 at 10:49 AM, ghnatiuk@... wrote:
Alex,
PayPal is fine.? Send to ghantiuk@...?and send as a friend so PayPal does not extract money out.
Stranded wire will not work.
If you want two jumpers for 4-wire Ohm cal(SOURCE and SENSE), then add and additional $5.
State a complete address with city etc.? I will not replace items if the mail messes up.? There is a limit to my time in making these jumper shorts.? The ends have to be adjusted to the proper diameter.? #6 solid wire is close but not on the money. The price I am giving you is Waayyyyyyyyy below cost in material and labor.
GH
?Hi George, Just sent you $10 via Paypal, and follow up email with address as sending money to a friend does not allow to include one. Thanks! Alex
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Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
The Tek 11801 has 4 Panasonic BR 2/3 A 1200 mAh 3 V lithium cells. All of those tested at 3.07 to 3.1 V despite manufacturing dates of 12-87 and 09-88. I think the fundamental issue with the NVRAM is the cells are too small. The ST battery caps for the SMD parts have a choice of 40 or 120 mAh capacities.
Once I get my replacements I'll try to reverse engineer the circuit in the NVRAM sockets.
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Re: I'm officially lost now with this 8753ES
Hello,
with apologies, I need to concur and agree.
There indeed is a header in the specification. You learn something every day.
Greets from Budapest, 3m under the ground
- - - - -
With best regards
Tam HANNA
Enjoy electronics? Join 13500 followers by visiting the Crazy Electronics Lab at
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On 23.03.19 22:50, Dave McGuire wrote: On 3/23/19 1:42 PM, Tam Hanna wrote:
Please let me protest the designation of BMP as a Windows format. I was referring to its origins, and the platform on which it sees by
far the most application. It was developed by Microsoft, for use within
Windows, in the mid-1980s. It has long been supported on most other
platforms that have graphical capabilities, but that changes neither its
origins nor its primary platform.
A BMP, short for BitMaP, simply is the content of a framebuffer farted out to a
disk. Not quite. A BMP file contains a header with metadata (actually two
such headers), then a colormap, then pixel data.
-Dave
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Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
I like the discreet component approach here and it looks like it would work well for Tektronix 2465B scopes as well that have a severe height constraint.? With respect to alkalines H.. No. Bad idea and I have done it to myself. The manufacture and quality of any alkaline these days seems seriously questionable.? Regards Paul. WB8TSL
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Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
That would be an interesting solution but they're actually a different lithium chemistry.? An iron disulfide cathode gives the 1.5 volt cell voltage:
Peter
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On 3/24/2019 11:47 AM, Chuck Harris wrote: As far as I know the 1.5V lithium AA cells are a hybrid between
a LDO power regulator, set to 1.5V and a 3V lithium cell of some
sort. The few I have found put out somewhere around 1.8V unloaded,
and drop back to 1.5 under load. I have been meaning to open one up.
I am not sure how they would hold up under a no current draw situation
like backing up a CMOS RAM.
-Chuck Harris
Peter Gottlieb wrote:
And they seem to be getting worse all the time.
What about those new lithium 1.5 volt AA cells? Very long shelf life and I have yet to see one leak. Seems like an ideal choice for memory backup.
Peter
On Mar 24, 2019, at 10:45 AM, Daun Yeagley <daun@...> wrote:
I couldn't agree more! I've had *terrible* experiences with alkaline cells leaking.
Daun
On 3/24/2019 10:25 AM, Chuck Harris wrote:
I suggest in the strongest terms, do NOT use alkaline
cells in any memory backup scheme. They will leak out
their electrolyte long before they run out the necessary
power to run the backup scheme.
I have done this experiment too many times, and lost too
much equipment to the damage the alkaline cells have done.
If you simply must use alkalines, put them on a long leash
and mount them outside of the instrument.
-Chuck Harris
Jack2015 wrote:
Usually there are three parts in a NVRAM,
1.SRAM
2.DS1210(or DS121x?)
3. 3V battery
This means we can make NVRAM by ourself,
HM6116+DS1210+two 1.5V AAA batteries=DS1220Y(2Kx8 NVRAM)
one 256K SRAM+DS1210+two 1.5V AA batteries(or one 3V battery)=DS1230Y=M48Z35Y 32kx8 NVRAM,
couple years ago I made following NVRAM for tek 11A32,last week I replaced the HM6116 with a 256K SRAM
and used it in CSA803(for a M48Z35Y=DS1230Y).it works well.by using larger capacity battery the life of data
storage will be much much longer!
Attachments:
NVRAM.jpg: /g/HP-Agilent-Keysight-equipment/attachment/95351/0
--
Daun E. Yeagley II, N8ASB
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Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
As far as I know the 1.5V lithium AA cells are a hybrid between
a LDO power regulator, set to 1.5V and a 3V lithium cell of some
sort. The few I have found put out somewhere around 1.8V unloaded,
and drop back to 1.5 under load. I have been meaning to open one up.
I am not sure how they would hold up under a no current draw situation
like backing up a CMOS RAM.
-Chuck Harris
Peter Gottlieb wrote:
toggle quoted message
Show quoted text
And they seem to be getting worse all the time.
What about those new lithium 1.5 volt AA cells? Very long shelf life and I have yet to see one leak. Seems like an ideal choice for memory backup.
Peter
On Mar 24, 2019, at 10:45 AM, Daun Yeagley <daun@...> wrote:
I couldn't agree more! I've had *terrible* experiences with alkaline cells leaking.
Daun
On 3/24/2019 10:25 AM, Chuck Harris wrote:
I suggest in the strongest terms, do NOT use alkaline
cells in any memory backup scheme. They will leak out
their electrolyte long before they run out the necessary
power to run the backup scheme.
I have done this experiment too many times, and lost too
much equipment to the damage the alkaline cells have done.
If you simply must use alkalines, put them on a long leash
and mount them outside of the instrument.
-Chuck Harris
Jack2015 wrote:
Usually there are three parts in a NVRAM,
1.SRAM
2.DS1210(or DS121x?)
3. 3V battery
This means we can make NVRAM by ourself,
HM6116+DS1210+two 1.5V AAA batteries=DS1220Y(2Kx8 NVRAM)
one 256K SRAM+DS1210+two 1.5V AA batteries(or one 3V battery)=DS1230Y=M48Z35Y 32kx8 NVRAM,
couple years ago I made following NVRAM for tek 11A32,last week I replaced the HM6116 with a 256K SRAM
and used it in CSA803(for a M48Z35Y=DS1230Y).it works well.by using larger capacity battery the life of data
storage will be much much longer!
Attachments:
NVRAM.jpg: /g/HP-Agilent-Keysight-equipment/attachment/95351/0
--
Daun E. Yeagley II, N8ASB
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Re: 8510C 85102A IF/DETECTOR L.O. Phaselock Out Upgrade / Option ?
My 8510C, with no listed options, has the connector too.
It is isolated between a pair of fiberglass washers, and
is in the cluster of connectors on the back of the IF/Detector
unit.
I guess what I am having trouble parsing from the OP's statement
below, is:
Is the hole the cable is coming out of labeled L.O. Phaselock Out,
or is the cable marked L.O. Phaselock Out?
Is the added hole just drilled somewhere on the back panel, or is
it one that was already there from the factory?
The way I am reading it is: There is a miscellaneous hole drilled
somewhere on the back panel of the IF/Det unit that has been labeled
with L.O. Phaselock Out, and it has a cable hanging out of it isn't
identified as to its purpose.
-Chuck Harris
Martin Rickes wrote:
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Hi Kevin,
at my 8510C there's also such an output. Mine looks quite original to me,
and my unit was Agilent-cal-sealed, when I got it.
Maybe somebody did brake the original BNC (it is fully isolated from the
case -> see picture) on yours and they bodged something together?
As you see, I did not connect it to anything (83620-Source).
73
Martin, DL8RI
Am So., 24. M?rz 2019 um 15:18 Uhr schrieb Kevin Hobbs <ve3kh@...>:
Hi 8510 Experts
I am piecing together an 8510C System ... the 85102A IF/DETECTOR has a BNC
cable hanging out of an added rear panel hole with a label that says "L.O.
Phaselock Out" ... Does anyone recall an upgrade or Option like this and
how it connects to the rest of the system etc?
Any wisdom appreciated !
73 Kevin
Attachments:
8510C_Phase_lock_bnc.jpg: /g/HP-Agilent-Keysight-equipment/attachment/95356/0
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Re: HP5335A fan replacement
I've read that HP sized its fans to cool the instrument even when operating at maximum outside air temperature. If that is true, one might get away with less airflow if ambient temps stay closer to "normal room temperature." My two 5245-family counters are definitely in need of quieter fans. I've thought of replacing the stock 4-inch fan with a 3-inch fan mounted on a heavy rubber sheet. The sheet would provide mounting, air control, and vibration isolation. Obviously that would not work on smaller, newer instruments that use a 3-inch fan to begin with.? ---Jeremy
On Sun, Mar 24, 2019 at 2:34 AM Andy ZL3AG via Groups.Io <zl3ag= [email protected]> wrote:
Would this be a situation where the best option would be to use some CPU cooler fans to direct local airflow to the hot components, allowing quieter fans to do the job in the back frame?
On 24/03/19 6:12 PM, Dan Nessett via Groups.Io wrote:
> I have looked high and low for a 80x80 fan that has equal airflow and lower noise specs that the fan already installed in my HP5335A without success. Given the comments by Joe / KN5U that many of the units he has repaired had replacement fans with lower airflow specs and failed Schmitt amplifiers (parts that are no longer available), I have decided to stick with the (noisy) installed fan.
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Re: HP5335A fan replacement
Hello to the group. The old noisy bad bearing fan issue. I agree very hard to find replacements these days. Hard enough that I have started to open the fans up and repair them. I am seriously a beginner at this. But it seems the fans are technically easy to disassemble. (Thats theory) Almost always there are little c clips you have to be careful with. They are small but key to getting in. I use various tools to release and then put them back in. Absolutely there should be official tools but when looking on epay as an example I can never figure out exactly what ones. When in stores that carry such things the points never seem small enough.
?With respect to sleeve bearings. After getting the fan assembly apart I clean it up. Transmission oil seems to do a nice job of getting rig of the old grease and dirt. Then I use gun grease to re-lube the bearings.
There may be better and lighter grease. Just hard to say whats correct.? I have not ventured into replacing real bearings yet. But that will happen and there really seems to be a lot of bearings available online. My understanding is these are press fit and can be knocked out. One day I will find out.
I suppose I should get ahead of that learning curve and buy some old fans at the next ham flea market and just experiment.
Regards Paul WB8TSL
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Re: NVRAM 28-Pin Encapsulated Package DS1230Y and 6811B
And they seem to be getting worse all the time.
What about those new lithium 1.5 volt AA cells? Very long shelf life and I have yet to see one leak. Seems like an ideal choice for memory backup.
Peter
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On Mar 24, 2019, at 10:45 AM, Daun Yeagley <daun@...> wrote:
I couldn't agree more! I've had *terrible* experiences with alkaline cells leaking.
Daun
On 3/24/2019 10:25 AM, Chuck Harris wrote:
I suggest in the strongest terms, do NOT use alkaline
cells in any memory backup scheme. They will leak out
their electrolyte long before they run out the necessary
power to run the backup scheme.
I have done this experiment too many times, and lost too
much equipment to the damage the alkaline cells have done.
If you simply must use alkalines, put them on a long leash
and mount them outside of the instrument.
-Chuck Harris
Jack2015 wrote:
Usually there are three parts in a NVRAM,
1.SRAM
2.DS1210(or DS121x?)
3. 3V battery
This means we can make NVRAM by ourself,
HM6116+DS1210+two 1.5V AAA batteries=DS1220Y(2Kx8 NVRAM)
one 256K SRAM+DS1210+two 1.5V AA batteries(or one 3V battery)=DS1230Y=M48Z35Y 32kx8 NVRAM,
couple years ago I made following NVRAM for tek 11A32,last week I replaced the HM6116 with a 256K SRAM
and used it in CSA803(for a M48Z35Y=DS1230Y).it works well.by using larger capacity battery the life of data
storage will be much much longer!
Attachments:
NVRAM.jpg: /g/HP-Agilent-Keysight-equipment/attachment/95351/0
--
Daun E. Yeagley II, N8ASB
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Keith Monahan
Jeremy Nichols