Re: Hello, and 16500A memory sizes
On Sat, Jan 19, 2013 at 7:50 AM, Chris Jones <chris@...> wrote:
Now I've installed ROMs version 00.02, and the 16500A has developed a
new fault: the self-tests 'HIL Controller', 'Front Panel' and 'Touch Screen'
all fail. I thought it was a software problem but putting the old 00.00
ROMs back in the problem is still there. I'm hoping it's just a bent pin
on the backplane connector or something but it's very annoying to get this
far and have a new fault to deal with, apparently unrelated to the RAM.
Has anyone got experience of what's likely to cause these three self-test
failures?
Chris
Don't all of those things connect through the same ribbon cable between the front panel and the CPU board? Are you sure that cable was reconnected correctly at both ends when you reinstalled the CPU board? Or does that cable connect between the front panel and the backplane board? It's been a while since I opened up a 16500. -Glen
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Re: Hello, and 16500A memory sizes
On Fri, Jan 18, 2013 at 11:34 AM, Chris Jones <chris@...> wrote: On 18/01/2013 11:24, Alexandre "tabajara" Souza wrote:
Chris, probably you're missing two addressing lines to upgrade it to
4mb. I think i have a newer board with
More memory, but it is some 600km away, i'll take a look at it as soon
as i can
The DRAM chips only need one more address line to be 4Mbit rather than
1Mbit (they're a matrix, not a linear array), and that address line (pin 5)
is definitely wired up (to one of the PALs, if I remember rightly) on this
CPU board, which is what made me think the upgrade was worth a try. The
full story is here, complete with wiring details:
<>
I would be interested to know what a newer 16500A CPU board looks like.
I've seen distant photos of them on eBay which appear to show SIL memory
chips.
Now I've installed ROMs version 00.02, and the 16500A has developed a new fault: the self-tests 'HIL Controller', 'Front Panel' and 'Touch Screen' all fail. I thought it was a software problem but putting the old 00.00 ROMs back in the problem is still there. I'm hoping it's just a bent pin on the backplane connector or something but it's very annoying to get this far and have a new fault to deal with, apparently unrelated to the RAM. Has anyone got experience of what's likely to cause these three self-test failures? Chris
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Re: "Event logging" T & M equipment?
On Fri, 18 Jan 2013 20:37:05 -0800, you wrote: Data logging devices are commonplace now days. Many high-end multimeters have such a feature where you can plug the meter up to a power source and record levels over time.
But I'm interested in recording out-of-bounds events such as spikes and sags in mains supply.
This type of measurement is typically only found in power systems analyzers which are quite "$pendy".
Anybody know of an event logger that is affordable? Why not make one? Take anyone's microprocessor board (Arduino would work well), feed it with AC, biased to half the supply voltage, then do a fast A/D on it. This gives you a running peak to peak voltage reading that you can examine for sags, excursions and the like. You can get either an RS-232 interface or USB as you wish. Harvey
THanks,
Dave
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Re: Foam conductor problems
My two Advantest TR5823H did not work because of bad conductive foam in the pushbutton switches. I opened all of the switches and put a dab of conductive stuff sold to repair rear window defrosters in cars. It has been several years now and there is no sign of the problem returning. I hope I am referring to the same kind of conductive foam switches, I have not been following this thread.
Peter.
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Show quoted text
----- Original Message -----
From: Gary
To: hp_agilent_equipment@...
Sent: Friday, January 18, 2013 8:50 PM
Subject: [hp_agilent_equipment] Re: Foam conductor problems
After taking these boards apart many times the results were always the same, either one or more LEDs and one or more buttons were not working. Every time it was a different set of buttons or LEDs. So I decided to take out the conductive foam and make my own mechanical connection using molex connectors and a right angle header. Now all the buttons and LEDs are working perfectly. Pictures of my mod are documented under "3561A repair"
Gary
--- In hp_agilent_equipment@..., "Gary" wrote:
>
> Thanks for the advice Karl; I'll give it a try.
>
> Gary
>
> --- In hp_agilent_equipment@..., Karl Schmeer wrote:
> >
> > Conductive foam:? I have found the torque on the mounting screws needs to be
> > near perfectly? equal for these to work. Lots of trial and error :-)
> >
> > As for the switch contacts, I have found it is a good idea to wash? with
> > distilled water? after the soaking in alcohol for a couple of hours, After this,
> > they need to dry overnight before re-installing. They will not work right away!
> > BTW recently I have found placing wet things on top of my de-humidifier, where
> > the really dry air comes out speeds up? the process.
> >
> > Best Luck
> >
> > Karl
> >
> >
> >
> > ________________________________
> > From: Gary
> > To: hp_agilent_equipment@...
> > Sent: Fri, December 28, 2012 10:19:59 PM
> > Subject: [hp_agilent_equipment] Foam conductor problems
> >
> > ?
> > I've added some pictures under "3561A repair" to document a problem with my SA.
> > All the electronics check out after replacing some parts but some of the buttons
> > and most of the LEDs were not working on the front panel. After opening the
> > front panel I found that this conductive foam seems to be the culprit. I've
> > repaired LCD displays by cleaning conductive foam but the conductors in this
> > foam seem very small. I cleaned it up with some ISO-alcohol and some of the LEDs
> > started working but some of the key pads quit working. I cleaned it a second
> > time and the same results. Some other buttons are working but some still not.
> > The LED problem is solely the problem of the conductive foam but the keys could
> > also be the conductive pads on the rubber keys. I've measured the resistance on
> > most of the pads and they are about 50 ohms except for some that are 200 ohms
> > and greater (up to about 480 ohms). I'm not sure what the max resistance can be
> > and still make the key function. My solution first is to just solder the two
> > boards with a connection harness to eliminate the conductive foam but I'm not
> > sure how to fix the rubber key problem. I have some conductive paint but the
> > resistance is still high, around 150 ohms. Does anyone have any success
> > repairing this kind of problem?
> >
> > Gary
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
[Non-text portions of this message have been removed]
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Re: How to test a mixer on a hp 8559 plugin in a 853 main frame
How about the other tests recommended? Throw some low level signals at the various IF's and see if you get a response. If the IF's work, could be a bad mixer (I doubt it with no 000 response), more likely no LO signal. That could be a bad connector, bad YTO, etc. you can check the oscillators with a diode detector if you don't have testing at those frequencies. Enjoy the art of troubleshooting.
Hey you guys, chime in here....
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--- In hp_agilent_equipment@..., "steven" wrote:
When its tuned to freq 000 there's no response
--- In hp_agilent_equipment@..., "jeffwa2scl" wrote:
Do you still get zero MHz response? If so, the 1st IF on are working to at least some degree. Baseline noise on wide RBW means the last IF and video are working. Can you inject some signals into the IF's directly. I think they are 2050, 321.4, and 21.4 in the 8559.
Divide and conquer. If you get the above responses, try connecting the calibrator directly to the mixer module input, bypassing the input lines and attenuator. Trace the signal path on the block diagram and work stage by stage.
Most of all, look at it as a challenge rather than a chore - have some fun with it (before you toss it across the room).
--- In hp_agilent_equipment@..., "steven" wrote:
--- In hp_agilent_equipment@..., "jeffwa2scl" wrote:
It very well may still be present, but it would be down quite a bit from where it should be, maybe 20 db or more down. I have an 8558 that was about 10 db down and suspected the mixer. Turned out it was the isolation capacitor in the input jack. Unless you transmitted into the mixer, they're tougher than you think and can take 10 dbm or so without problem. How's the sensitivity on the higher bands? These bypass the 1st IF and 2nd mixer.
--- In hp_agilent_equipment@..., "steven" wrote:
If the mixer is bad will there still be a 35mhz calibraed signal on the screen? please let me know asap. thank you
Nothing is showing at all high or low bands
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On Sat, Jan 19, 2013 at 12:16:01AM -0800, John Miles wrote: Lots of Advantest spectrum analyzers out there. Many with great
performance, some at good prices. Few/none with schematics. Do you feel
lucky? In the past schematics could be had from Japan for some of these. Maybe they tightened up. -- Dave Emery N1PRE/AE, die@... DIE Consulting, Weston, Mass 02493 "An empty zombie mind with a forlorn barely readable weatherbeaten 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in celebration of what could have been, but wasn't and is not to be now either."
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Lots of Advantest spectrum analyzers out there. Many with great
performance, some at good prices. Few/none with schematics. Do you feel
lucky?
-- john, KE5FX
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-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Doug
Sent: Friday, January 18, 2013 11:30 PM
To: hp_agilent_equipment@...
Cc: Jeff Miller
Subject: Re: [hp_agilent_equipment] Re: Spectrum Analyzer
On 01/18/2013 10:07 PM, Jeff Miller wrote:
Just curious,
What do you think of the Advantest SA vs HP or Tektronix brands?
Thanks in advance.
Jeff M.
I am now retired for almost 10 years, but at my place we had about 4 or 5
Advantest SAs. They worked very well, and are relatively small. One thing I noticed is that the CRT would go dim a little sooner than that of some other CRT-using devices. (As usual in r&d labs, the equipment was never turned
off, day and nite, day in and day out.) For normal use in a home lab, I
would
not expect that to be a problem. Maybe the newer ones have LCD displays,
and then you would not have to worry about that.
I would think if anyone is buying a new SA, or even a used one, a tracking
generator is a huge improvement on the capabilities of the SA, so spend the extra money. This obviously applies to any make that offers the capability.
--doug, WA2SAY, retired RF engineer
------------------------------------
Yahoo! Groups Links
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On 01/18/2013 10:07 PM, Jeff Miller wrote:
Just curious,
What do you think of the Advantest SA vs HP or Tektronix brands?
Thanks in advance.
Jeff M.
I am now retired for almost 10 years, but at my place we had about 4 or 5 Advantest SAs. They worked very well, and are relatively small. One thing I noticed is that the CRT would go dim a little sooner than that of some other CRT-using devices. (As usual in r&d labs, the equipment was never turned off, day and nite, day in and day out.) For normal use in a home lab, I would not expect that to be a problem. Maybe the newer ones have LCD displays, and then you would not have to worry about that. I would think if anyone is buying a new SA, or even a used one, a tracking generator is a huge improvement on the capabilities of the SA, so spend the extra money. This obviously applies to any make that offers the capability. --doug, WA2SAY, retired RF engineer
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Re: "Event logging" T & M equipment?
Can't get a lot cheaper than that.
(Another) Dave Thanks for that Dave. In this day of digital and handheld T & M, this is antique, but affordable and functional it is... Dave (yet another)
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Re: "Event logging" T & M equipment?
Dave
No relation to seller, but here is an expandable, newer model Dranetz unit with a line analyzer plugin and a 30 day right of return, for $61, including shipping (at least to my location).
Can't get a lot cheaper than that.
(Another) Dave
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Show quoted text
On 1/18/2013 11:37 PM, Dave C wrote: Data logging devices are commonplace now days. Many high-end multimeters have such a feature where you can plug the meter up to a power source and record levels over time.
But I'm interested in recording out-of-bounds events such as spikes and sags in mains supply.
This type of measurement is typically only found in power systems analyzers which are quite "$pendy".
Anybody know of an event logger that is affordable?
THanks,
Dave
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Re: How to test a mixer on a hp 8559 plugin in a 853 main frame
When its tuned to freq 000 there's no response
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "jeffwa2scl" wrote:
Do you still get zero MHz response? If so, the 1st IF on are working to at least some degree. Baseline noise on wide RBW means the last IF and video are working. Can you inject some signals into the IF's directly. I think they are 2050, 321.4, and 21.4 in the 8559.
Divide and conquer. If you get the above responses, try connecting the calibrator directly to the mixer module input, bypassing the input lines and attenuator. Trace the signal path on the block diagram and work stage by stage.
Most of all, look at it as a challenge rather than a chore - have some fun with it (before you toss it across the room).
--- In hp_agilent_equipment@..., "steven" wrote:
--- In hp_agilent_equipment@..., "jeffwa2scl" wrote:
It very well may still be present, but it would be down quite a bit from where it should be, maybe 20 db or more down. I have an 8558 that was about 10 db down and suspected the mixer. Turned out it was the isolation capacitor in the input jack. Unless you transmitted into the mixer, they're tougher than you think and can take 10 dbm or so without problem. How's the sensitivity on the higher bands? These bypass the 1st IF and 2nd mixer.
--- In hp_agilent_equipment@..., "steven" wrote:
If the mixer is bad will there still be a 35mhz calibraed signal on the screen? please let me know asap. thank you
Nothing is showing at all high or low bands
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Re: "Event logging" T & M equipment?
Dave,
I'm not sure how big your budget is, but I've picked up good working older model Dranetz power line analyzers for less than $200 on eBay. There are over 250 listings from them up now. They are plug and play, and record all of the parameters you mentioned.
(Another) Dave
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Show quoted text
On 1/18/2013 11:37 PM, Dave C wrote: Data logging devices are commonplace now days. Many high-end multimeters have such a feature where you can plug the meter up to a power source and record levels over time.
But I'm interested in recording out-of-bounds events such as spikes and sags in mains supply.
This type of measurement is typically only found in power systems analyzers which are quite "$pendy".
Anybody know of an event logger that is affordable?
THanks,
Dave
|
"Event logging" T & M equipment?
Data logging devices are commonplace now days. Many high-end multimeters have such a feature where you can plug the meter up to a power source and record levels over time.
But I'm interested in recording out-of-bounds events such as spikes and sags in mains supply.
This type of measurement is typically only found in power systems analyzers which are quite "$pendy".
Anybody know of an event logger that is affordable?
THanks,
Dave
|
Re: How to test a mixer on a hp 8559 plugin in a 853 main frame
Do you still get zero MHz response? If so, the 1st IF on are working to at least some degree. Baseline noise on wide RBW means the last IF and video are working. Can you inject some signals into the IF's directly. I think they are 2050, 321.4, and 21.4 in the 8559.
Divide and conquer. If you get the above responses, try connecting the calibrator directly to the mixer module input, bypassing the input lines and attenuator. Trace the signal path on the block diagram and work stage by stage.
Most of all, look at it as a challenge rather than a chore - have some fun with it (before you toss it across the room).
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "steven" wrote:
--- In hp_agilent_equipment@..., "jeffwa2scl" wrote:
It very well may still be present, but it would be down quite a bit from where it should be, maybe 20 db or more down. I have an 8558 that was about 10 db down and suspected the mixer. Turned out it was the isolation capacitor in the input jack. Unless you transmitted into the mixer, they're tougher than you think and can take 10 dbm or so without problem. How's the sensitivity on the higher bands? These bypass the 1st IF and 2nd mixer.
--- In hp_agilent_equipment@..., "steven" wrote:
If the mixer is bad will there still be a 35mhz calibraed signal on the screen? please let me know asap. thank you
Nothing is showing at all high or low bands
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Just curious, What do you think of the Advantest SA vs HP or Tektronix brands? Thanks in advance. Jeff M. ________________________________ From: "james.liles@..." <james.liles@...> To: hp_agilent_equipment@... Sent: Thu, January 17, 2013 10:00:30 PM Subject: [hp_agilent_equipment] Re: Spectrum Analyzer I’ll vote for an 8568B with an 8447D in front of it. Use a probe with 2pf cap on the end. Do the math and you have a pseudo fet probe > -140 and 100hz to 1.5Ghz. Slip a copper strap around a tube and you can measure the amplitude and frequencies present without disrupting the circuits at least through 40Mhz. Want to sweep a filter and record the attributes set max hold on --- sweep as slow as you like, won’t need a digital/storage scope. Build a filter and analyze the cutoff or band pass as well as harmonics. Tip of the iceberg. Kindest regards Jim K9AXN From: Patrick Wong Sent: Thursday, January 17, 2013 8:45 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: Spectrum Analyzer I agree that a digital scope with FFT is quite helpful. However it doesn't have the same dynamic range as an SA which can typically read down to -120 dBm or better, using a narrow RBW. One benefit of the scope is the 1M input, which places a much smaller load on the circuit under test, vs. the SA with a 50 ohm input. Patrick Wong AK6C --- In mailto:hp_agilent_equipment%40yahoogroups.com, "Max Robinson" wrote:
I don't mean to rain on anyone's parade but I wonder if he really needs a
spectrum analyzer. I do the same kind of work and I get along just fine
without one. I have an HP 334A harmonic distortion analyzer for audio and a
Tek TSD 2012 which has FFT for RF. I saved my pennies for a long time to
buy the Tek.
Regards.
Max. K 4 O DS.
[Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
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Re: How to test a mixer on a hp 8559 plugin in a 853 main frame
--- In hp_agilent_equipment@..., "jeffwa2scl" wrote:
It very well may still be present, but it would be down quite a bit from where it should be, maybe 20 db or more down. I have an 8558 that was about 10 db down and suspected the mixer. Turned out it was the isolation capacitor in the input jack. Unless you transmitted into the mixer, they're tougher than you think and can take 10 dbm or so without problem. How's the sensitivity on the higher bands? These bypass the 1st IF and 2nd mixer.
--- In hp_agilent_equipment@..., "steven" wrote:
If the mixer is bad will there still be a 35mhz calibraed signal on the screen? please let me know asap. thank you
Nothing is showing at all high or low bands
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Re: 16500 Logic Analyzer Discussion
On Fri, 18 Jan 2013 12:28:35 -0800, you wrote: (Changing the subject from spectrum analyzers to logic analyzers)
On Thu, Jan 17, 2013 at 7:51 PM, Harvey White <madyn@...> wrote:
On Thu, 17 Jan 2013 22:44:04 -0500, you wrote:
Logic analyzers are really cheap compared to spectrum analyzers, though.
The 16500C is such a terrific deal on the used market because it has
Ethernet and no need to fuss with getting a PC with an HP-IB card or a
converter set up. (And you can put an okay if not great digital scope in
it
too.) So point me at one for fifty bucks, and I'm in.... (seriously, I do
have a 16500B.......)
However, have you priced the blades?
They're not all that cheap unless you go for very early models, and
those have (to me) serious operability issues....
I'd start with the 166x series (myself), but I do like the 16500B (at
least) for the touchscreen interface..... The blades can kill you for
price, though.
Harvey
The problem with a 16500B or 16500C for $50 if you find one at that
price you could easily pay that much for shipping if it's not local.
And if you don't pay that much for shipping it might be poorly packed
and get damaged during shipping. If you could also find a 16700A for
say $150 plus $50 in shipping in my opinion I would most often rather
have a bare 16700A for say $200 total than a bare 15600B or 16500C for
$100 total. Which is a decent point. I'll put that on my list (but I think it's going to be an eventual list).
"Blades" is not a term I have generally heard for the 16500/16700
series modules, but I'll go along with that.
I think I heard it here on this list, FWIW. What do you think is a
reasonable price that won't break your bank for say a fully functional
16555A module with the POD1/POD2 and POD3/POD4 cable sets, but without
the breakout lead sets and grabbers? I ask because I have many more
16550A and 16555A modules than I have any need for that I should
unload. I've gone one already, so that's working for me. hard to say, because I'm inherently cheap. I can spring for things in the 50 dollar range, but less is better, even better if it includes shipping. So you see, my expectations are unreasonable. I think I've seen them on Ebay for 75 to 100 dollars, and with the cables (of course), finding the cables is difficult at best (from what I've seen, then again, there's a lot of "not at that price" in my world). Also have excess 16700 mainframes. Located in WA, USA. Hmmm..... Let me think about that. I've got LCD monitors, and I *do* make use of the 16500B frequently. Something with a bit different interface could be nice.
Also, regarding network control of 16500B / 16500C, you can only do
that on the 16500B if it has the optional 16500H or 16500L LAN
interface installed. Not all of them have that installed. If you do
have that one of the ways you can control the analyzer is to FTP a
plain text file containing a set of programming commands to the
\system\program file.
Haven't tried that, did try xwindows, had a fun time trying to make it work on a PC... Kinda did.... I do have the LAN interface, though. Not sure which it is. I've used that in the past to create new
configuration setups. I have found it much easier at times to keep
editing a text file and sending that to the analyzer to refine a
complicated configuration than to poke around at the touch screen
interface. For reference, see 16500H Interface Module LAN User's
Guide (May95), 16500-97013. I generally do relatively simple things, like decode I2C and look at it in the state machine view. That needed a custom pod, though. The older use, debugging a microprocessor by looking at the address and data lines, is a bit obsolete (although I do have some obsolete equipment), but the newer microcontrollers can't be spayed upon that way. Harvey
-Glen
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Re: Foam conductor problems
After taking these boards apart many times the results were always the same, either one or more LEDs and one or more buttons were not working. Every time it was a different set of buttons or LEDs. So I decided to take out the conductive foam and make my own mechanical connection using molex connectors and a right angle header. Now all the buttons and LEDs are working perfectly. Pictures of my mod are documented under "3561A repair"
Gary
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "Gary" wrote:
Thanks for the advice Karl; I'll give it a try.
Gary
--- In hp_agilent_equipment@..., Karl Schmeer wrote:
Conductive foam:?? I have found the torque on the mounting screws needs to be
near perfectly??equal for these to work. Lots of trial and error :-)
As for the switch contacts, I have found it is a good idea to wash??with
distilled water??after the soaking in alcohol for a couple of hours, After this,
they need to dry overnight before re-installing. They will not work right away!
BTW recently I have found placing wet things on top of my de-humidifier, where
the really dry air comes out speeds up??the process.
Best Luck
Karl
________________________________
From: Gary
To: hp_agilent_equipment@...
Sent: Fri, December 28, 2012 10:19:59 PM
Subject: [hp_agilent_equipment] Foam conductor problems
??
I've added some pictures under "3561A repair" to document a problem with my SA.
All the electronics check out after replacing some parts but some of the buttons
and most of the LEDs were not working on the front panel. After opening the
front panel I found that this conductive foam seems to be the culprit. I've
repaired LCD displays by cleaning conductive foam but the conductors in this
foam seem very small. I cleaned it up with some ISO-alcohol and some of the LEDs
started working but some of the key pads quit working. I cleaned it a second
time and the same results. Some other buttons are working but some still not.
The LED problem is solely the problem of the conductive foam but the keys could
also be the conductive pads on the rubber keys. I've measured the resistance on
most of the pads and they are about 50 ohms except for some that are 200 ohms
and greater (up to about 480 ohms). I'm not sure what the max resistance can be
and still make the key function. My solution first is to just solder the two
boards with a connection harness to eliminate the conductive foam but I'm not
sure how to fix the rubber key problem. I have some conductive paint but the
resistance is still high, around 150 ohms. Does anyone have any success
repairing this kind of problem?
Gary
[Non-text portions of this message have been removed]
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Re: HP 3468 DMM battery change
Did you check the power supply voltages?
Joe
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Show quoted text
-----Original Message----- From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of xyloeye Sent: Friday, January 18, 2013 1:52 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: HP 3468 DMM battery change Yeah, I disconnected the battery overnight and shorted the RAM chip Vcc to gnd to clear any leftover capcitance, etc. That had no effect. I'm kind of thinking maybe something was on the verge of failure and I pushed it over the edge. Problem is, even if I narrow it down to a component, all of the chips are unobtainable now. Thanks again for your help Jeff. Ken --- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> , Jeff Machesky wrote:
You may need to disconnect the battery again to allow the RAM to "zero"
out. Well at least not be in it's present state.
Just a thought,
Jeff
On 1/17/2013 5:16 PM, xyloeye wrote:
Thanks for your reply. You're right, error 1 is calibration RAM. I
tried to calibrate it but since the display is dead, it's hard to do.
When the lead fell off I'm positive it didn't touch anything else. I
just can't figure out how disconnecting the battery would cause a dead
display.
Ken
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham" wrote:
I tried to remove and read the contents of the ROM on my 3478A. In the
process, I apparently shorted the 5 V line to ground, which somehow
killed
the contents of the CALRAM. In any event, there was a message about
Calibration. I then replaced the battery and went through the recalibration
steps and all was well.
According to the manual for the 3468A, Error 1 is 'Calibration RAM Error'.
Error 2 is 'RAM Error'.
I suspect that the issue is that you lost the RAM contents for the
Calibration RAM. Have you tried to calibrate the unit? Have you
checked the power supplies?
The alternative is once the lead slipped off, it 'connected' to something
else and took out something. Was it the + or - lead?
Sounds like you need to go the service manual and start with the
trouble shooting section, probably Service Group E, and go from there.
Good luck.
Joe
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of xyloeye
Sent: Thursday, January 17, 2013 2:06 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: [hp_agilent_equipment] HP 3468 DMM battery change
I'm having some trouble with a battery change in a 3468 DMM. You would think
I could handle that without incident! I kept 3 volts on the terminals while
soldering in the new battery but one of the leads slipped off and there went
the calibration. No problem - I can calibrate it again or so I thought. The
display flashed "error 1" (ram error)and then went blank. It's been blank
ever since despite all the resetting procedures I've tried. Could corrupt
ram cause this? Or is could I have somehow damaged the controller? Any
thoughts would be appreciated.
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Re: Failing 3585A Spectrum Analyzer
You would be amazed at how much noise can get into
test equipment through the power cord...
Corcom filters are nice things, but they do have their
limits.
-Chuck Harris
gldinnc wrote:
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I traced the source of the spikes to some failing halogen light dimmers. I have
replaced them and the problem is all but gone.
Why the noise gets in to the 3585 is a mystery, but who cares.
I am glad to now have faith in this great piece of equipment - as long as I don't
have to move it :).
thanks to all who offered help. And special thanks to Vladan who went an extra
mile helping me off line.
Gordon, KA2NLM
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