Re: 8594E need documents for processor board and battery question
Gordon GM1THS?
?
I have two HP 8591E spectrum analysers one has the AA (wire leads) battery the other the coin cell type battery. The latter one is the easiest to replace it¡¯s on a daughter board which has a super cap ( the one with the battery on the main board also had a super cap) so it¡¯s easy to remove and as long as you have switched the spectrum analyser on for a half hour or so to make sure it¡¯s charger up you will have no problem.?
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Then??you just remove the daughter board then remove the plastic insulator under the board and remove the old battery and put in the new one. It¡¯s best to back up the calibration data first to be sure tho. There was a spreadsheet template on the files section so you can put all the data in your spreadsheet I also updated the firmware to the last version I could find which was??980615 both my analysers were made in 1995 and had the original battery¡¯s. The worst of the two replaced is the one with the battery on the main board as you have more to remove and the board interconnected was difficult to disconnect as you have to be careful not damaged the interconnect while removing the board.?
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Gordon GM1THS?
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Re: looking for HP85101C display keys plastic frame
Many thanks again for your great support, Askild!
Best regards,
Tom
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HP 8656B A3 Low Frequency Loop Fractional-N Microprocessor
I have a faulty 8656B which is unable to establish a lock in the low frequency loop. There is no change at the output when troubleshooting with TP18 and TP17, which leads me to suspect A3U28 (HP PN 1820-3618) had failed. Serial data is seen at pin 9 of the IC and the 4MHz oscillator is working.
The chip looks like some sort of 8-bit Motorola micro, but I can't determine what type. Does anyone have any information on this chip or the firmware it is running?
Thanks and 73,
Ed
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8594E need documents for processor board and battery question
My HP 8594E has a serial number prefix of 3513
In the process of replacing the memory battery I discovered that my unit has the AA size 3.6 volt lithium battery installed directly on the processor/memory board.
The board is marked as:
Processor
A-3243-53
on a white sticker:
08590-60356
The 8590 series service manual I downloaded only has the newer set up with the battery on a sperate card.
In that manual it does have my board listed and refers to CLIP 08590-90254
I would like to obtain schematics and board layouts if anyone has them for this board. Have done some Googling, but no success.
Meanwhile, I have a question. Has anyone here replaced the battery on a unit that has the battery on the memory board like mine? If, so did you lift the board to unsolder the battery, or clip the leads and solder to the stubs, or unsolder and resolder from above without lifting the board?
Thanks
Rik
WA4BAN
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Re: HP 8594E low signal level indicated
Installed the 2nd converter and the 8594E is now indicating normal sensitivity.
Next up, is replacing the memory battery.
Rik
WA4BAN
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Re: looking for HP85101C display keys plastic frame
Hi all,
Unfortunately, my model for my HP8757 did not fit well on Tom's HP85101C. Tom and me have had some off list communications, and he has done good measurements on his HP85101C, and I have made a new 3d model to fit this. He has now got this produced at JLC, and the fit is good. I have now uploaded the 3d file to Thiniverse: ??
Regards, Askild
On Sun, Feb 26, 2023 at 6:03?PM John Griessen < john@...> wrote: On 2/26/23 06:17, tom_iphi via wrote:
>
> the resin printed parts from JLCPCB have arrived and I am positively surprised about the nice surface finish, see picture.
Nice 3D model too!
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This is great, thanks!
--
Jack
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Re: Advice or a little driver help needed with an E5504A phase noise measurement system wand VXI digitizer
Somewhere in the release notes for A.04.05.xx (I don¡¯t recall exactly version), there was a note that it opened all ACMs
toggle quoted message
Show quoted text
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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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.
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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
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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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Rik Rasmussen WA4BAN
Michael A. Terrell