HP 53310A modulation domain analyzer memory upgrade
Hi Folks,
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On the hunt for a source for the RAM chips to expand the memory in my 53310A
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The usual Googling around has yet to yield 4 pieces from a single source.
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Do any of you have 4 that you would be willing to part with..?
Candidates are: Cypress CY7C194-25PC, Hitachi HM6708P-25, ?Motorola MCM6208P25, ?or equivalent.
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Located ?Louisville, KY 40206 USA
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Re: Tricks and thoughts about the 3457A battery
Hello Dr. Kirkby, This would work in the case you can send it via some company. Keysight is not working with private persons anymore and I didn't find other labs that work with private persons at least in the EU. I tried to get some calibration services for a few power sensors and nobody wanted to work with me as a private person. Also, I tried to order from them the test leads for a multimeter and they requested a VAT ID and a company name. You don't have that you cannot order services or parts. Best regards, Razvan On 31/03/2025 13:18, Dr. David Kirkby, Kirkby Microwave Ltd via groups.io wrote: On Sun, 30 Mar 2025 at 17:00, Joel Setton via groups.io <
groups.io> <setton@... <mailto:[email protected]>> wrote:
I did it ! I replaced the memory battery in my 3457A.
My used 3457A was built in the late '80s and still had its original
lithium battery, with a 1989 date code on it. This battery obviously
needed replacement.
Another option is to ignore trying to save the calibration constants,
replace the battery and send it to Keysight and let them calibrate it.
Then it will be as good as you will get it. I did that, and they
replaced the battery. There were before and after measurements - they
made no attempt to save the constants. So everything was better after
calibration. In contrast if you send it there are calibration constants
about right, if it's in spec they will not adjust it. In contrast, by
putting them all wrong, everything needs adjustment.
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Re: Tricks and thoughts about the 3457A battery
Hello Joel,
I was thinking it is the version with 4 holes. I found the same design
in 2 of my Meinberg GPS167 units. One had a battery holder with 2 pins
and one had a battery with 3 pins.
I looked around for 4 months for a battery holder for the BR2/3A or
CR1/2AA with 3 pins for my E4418B and found nothing. The Agilent EPM
series have the same battery type BR2/3A but the PCB only has 3 holes
exactly how the battery is. There is no 4th hole between the two (+) pins.
Can I ask which model of the battery holder you bought? Do you have a link?
Thanks for the pictures and details.
Best regards,
Razvan
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On 31/03/2025 10:48, Joel Setton via groups.io wrote: Hello Razvan,
You are right, the original battery has 1 pin on the (-) end, and two
pins on the (+) end. However, I found that the PC board has three plated
holes on the (+) side including one in the middle, which makes it
perfect for a standard battery holder with 2 wires. Please see the
attached pictures.
Have a great day !
Joel
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Re: 3585B Spectrum Analyzer
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Feet for ESG style instruments. 3D model.
I have modelled a simple foot that I use for the ESG series generators.
It is just tall enough for the instrument chin to hover over the desk surface.
Leo
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Here goes nothing:
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Re: 3585B Spectrum Analyzer
Hello everyone.
Please help.
I have a 3585B that wont power up.
I need a copy of the service manual, can anyone help??
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Thank you both for chiming in.??
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The unit is a 7562A, I apologize for the typo.
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I pulled a couple from another board and measured one side of each package, presumption is the other is similar.
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I was tweaking with the settings so some inconsistencies below.? ?The pinch off voltage range based on the two sets is between -1.6V and -2.2V.? IDSS 2.6 to 4.2mA at 10V VDS.
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Re: Tricks and thoughts about the 3457A battery
My standard approach for replacement of batteries that support NVRAM containing instrument calibration , etc. is to connect either another battery or external power supply **with floating outputs** through a 1K ohm resistor to the PWB traces elsewhere on the board, usually after a reverse flow blocking diode in the battery circuit if it is present. Then removal of the old battery is easy without losing the contents of the RAM. The 1K resistor is just a precaution to keep from drawing high currents or other possible issues if you happen to connect to a wrong part of the circuit with the external power supply.
If one chooses to try the instrument power-up approach as you had mentioned make certain that you use a soldering iron that is not connected to third wire ground or has the tip grounded otherwise or else you will short out the battery and kill the RAM contents. Use of a battery powered soldering iron also allows safe removal of the battery. But that offers no help if a vacuum desoldering iron is required of which it frequently is.
Greg
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Re: HP6209B component location layout
Just FYI, you can use the (much shorter) www.hpwiki.org hostname in that URL.
-Dave
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On 3/29/25 19:02, Hugh Gilbert via groups.io wrote: I think you will need to select R38, (~30k) section 5-45, it sets the meter zero by canceling the programming current that passes through the current sense resistor. R53,(3k) may need to be changed also.
Check here for a manual with schematic.
<>
Hugh Gilbert
Hugh Gilbert
On Sat, Mar 29, 2025 at 4:52?PM Alex via groups.io <> <hpagilentgroup@... <mailto:[email protected]>> wrote:
Correction to my previous post: meant to say MINIMUM OUTPUT VOLTAGE
after adding the 47K resistor in series with R10 is about 160V,
maximum output is still about 320V.
I am checking some voltages around the current meter circuit: the
-3V shown on the schematic to be present at one side of R38/R53
measures only -2.29V. Same value at the cathode of CR8 in the bias
supply where this voltage originates. Cathode of CR7 has +1.77V.
CR7 is a 1N4830 "stabistor" 2.4V @ 100mA. Guessing some sort of
reference voltage or early zener diode. On the other hand CR8 is
listed as 1N3828 and seems to be a regular silicon small signal
diode. The way they are connected in series in the bias supply (for
among others temperature stability) I would expect the -3V output to
be the sum of the CR7 voltage, plus about 0.6-0.7V additional drop
of CR8, so indeed about 3V. But in real life CR8 seems to have a
drop of only 0.5V as measured, so do I have a bad CR7 that has gone
low from the original 2.4V to only 1.77V?
The other bias supply voltages: +43V is at +37.5V, and the +16V is
correct at +15.98V.
And at the reference regulator, the +6.2V (33) measures 6.43V, the
+12.4V (37) measures 12.66V, and the -6.2V (31) measures -6.22V.
All voltage readings referenced to +S (same as positive/red output
binding post with correct rear jumpers in place).
All other rear jumpers where also verified earlier to be in the
standard configuration as shown on the schematic.
--
Dave McGuire, AK4HZ
New Kensington, PA
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Many thanks for your feedback! What was the problem with yours? A broken data line? Why exactly 100MHz shift?
Or is some YIG lookup table messed up so it locks to the wrong harmonic? How did you get it fixed?
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Tom DG8SAQ
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Hi Tom,
I got same problem few years ago on my 83630B. The faulty module is the low band module on the RF deck at the far end opposite to the output RF connector.
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Re: PCB CAD used and/or sold by HP ?
Here is a link to EGS and some history.?
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https://www.hewlettpackardhistory.com/item/a-new-dimension-to-design/
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Hi folks,
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my 8510C system recently developped an unlock error, so I have checked the source HP83651A first.
It turns out, that the source output below 2,4GHz is exactly (to the Hz) 100MHz too low, while above 2,4GHz it is spot on.
Also, the 8510C works fine above 2,4GHz.
Has ever anybody seen such a strange problem? Any ideas what could cause this?
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Tom
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Re: PCB CAD used and/or sold by HP ?
Believe it was HP EGS...Engineering Graphics System , ran on series 200 and 300 and recall
a package running on the HP 9816 desktop.?
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Re: Tricks and thoughts about the 3457A battery
David,
everytime I walk past the delivery section in my company I wonder what "sending from and to" of these quite sensitive instruments will do to the calibration. There are always some instruments sitting on the shelfs waiting to be picked up for calibration. Naked, not packed in some special purpose container or such. If I was the instrument :-) I would prefer having me calibrated on-site, with nothing more than a trolley to be put upon and back in the rack when finished.
cheers
Martin
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Re: Tricks and thoughts about the 3457A battery
I did it ! I replaced the memory battery in my 3457A.
?
My used 3457A was built in the late '80s and still had its original lithium battery, with a 1989 date code on it. This battery obviously needed replacement.
Another option is to ignore trying to save the calibration constants, replace the battery and send it to Keysight and let them calibrate it. Then it will be as good as you will get it. I did that, and they replaced the battery. There were before and after measurements - they made no attempt to save the constants. So everything was better after calibration. In contrast if you send it there are calibration constants about right, if it's in spec they will not adjust it. In contrast, by putting them all wrong, everything needs adjustment.?
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Re: Repair HP3455A Multimeter
Hi have a pdf from the flowcharts, group B schematics and the groupB service excerpt.
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Re: Tricks and thoughts about the 3457A battery
"Joel Setton via groups.io" <setton@...> writes: Hello Martin,
The EPROM idea is interesting, I have explored it but I don't think it
could work. The main issue is that the 8Kbyte RAM
chip which holds the calibration data (TC5564APL-15) is also used to
store the processor stack, firmware variables,
user's memorized measurements etc.
From the schematic, we know the RAM is used as follows :
- Calibration RAM data is from 0040 hex to 01FF hex with a special
hardware mechanism to prevent accidental overwrite of
this area.
- General storage RAM (processor stack, miscellaneous variables, user
measurement FIFO etc) from 0200 to 1FFF.
.... In summary, replacing the RAM chip with an EPROM would not
work. One (strong) reason is that the processor stack
and RAM storage would not be writable. Using an FRAM might be a possible solution. A quick search showed that there's a FM1608B vom Cypress - 8Kx8 and available in DIP.
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Re: Looking for documentation on 4263A LCR meter
Hi Jared,
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I had a check - no info on this instrument
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Peter
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Re: Tricks and thoughts about the 3457A battery
Hello Razvan,
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You are right, the original battery has 1 pin on the (-) end, and two pins on the (+) end. However, I found that the PC board has three plated holes on the (+) side including one in the middle, which makes it perfect for a standard battery holder with 2 wires. Please see the attached pictures.
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Have a great day !
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Joel
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Dave McGuire
Martin
Dr. David Kirkby, Kirkby Microwave Ltd
Ralf Rosche
