Re: Replace Neon NE-2 with Zener in 141T PSU?
Hi Dave,
In theory, ~18x 4.5v zeners would provide the lowest drift reference for a pure-zener design.
However, a single 82v zener has a tempo of around 0.073%. Compared to the 0.004% of the original reference bulb this is pathetic, however, looking at the dozens of carbon resistors, dried out caps, and of course the?potentiometer that sets the gain (and remember, new pots are generally not better than 100 PPM unless they are very expensive), I think the drift and tempo from a single zener will be the least of this circuit's problems!?
Thanks all for your input!
--E W6EL ?
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Re: USB Power Probe Calibration software
1.) There are some commercial Power Sensor Calibration packages out there that support the USB Sensors ( PS/CAL, Surecal)? but those are very expensive ??? i am not aware of any free software that allows for a user to access/edit the calibration factors
2.) There are commands on the E Series Power sensors that allow access to the Sensor EEPROM but i am not sure if this is the case for the USB Sensors as well
??? you can try DIAG:SENS:EEPROM ? X with X being the number of bytes to read and see if you get a reading but even if you do than it will take quite a bit of work ? ? to figure out the calibration factors
3.) if your sensor readings are "way off "? than it is very likely that your sensor is damaged ,? try readings at different power levels (+10, -10, -20, -40dBm and see if they are all off by the same magnitude ,? wide dynamic range sensors have two diode detectors and a range switch , depending on the power level either the high or the low range detector is used ,? if only one range is off than this is a indication that one of the detectors is faulty , if both are than you either have a damaged attenuator ( on the H Series sensors ) or a corrupted EEPROM ! ?
On Wednesday, July 12, 2017 10:06 AM, "pbbob426@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:
?
I have acquired an in-calibration U8485A opt 200 USB thermocouple power sensor and a way out of certified calibration U2001H USB diode power sensor. I also have the latest N1918A Power Panel (free version) and the latest full BenchVue (on trial for 3 more weeks).
Does anyone know about the (probable) software that can read (and write) the calibration data to these probes? Is a "secret' option in one of the packages I have? If not, how can I get it?
Thanks for your help. BobD
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Re: Thin black air filter foam
Greetings,
At least in the USA it is available from McMaster Carr ()
|
8" |
Not Rated |
Polyurethane Foam |
Gray |
200¡ã |
|
|
|
|
|
|
12" |
Not Rated |
Polyurethane Foam |
Gray |
200¡ã |
|
|
|
|
|
I believe you want the ¡°30 pores per inch¡±.
A search for ¡°air filter foam¡± on their web site will bring you to the correct page. ?You can also search by one of the above listed part numbers.
I don¡¯t know, but would expect McMaster to ship all over the world.
Best of luck,
Ken
toggle quoted message
Show quoted text
Something like this?
Neil G4DBN
About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.
Used on the air inlet where the fan exhausts the unit.
What's this darn stuff called and where to get it (in UK ideally)?
|
Re: Thin black air filter foam
I think this page has what you want.
Paul. G8AQA
???
About 2-3mm (maybe as much as 1/8") thick fairly open
mesh, I've searched
eBay for air filter sheet failed to find anything
suitable.
Used on the air inlet where the fan exhausts the unit.
What's this darn stuff called and where to get it (in UK
ideally)?
Thanks
Dave
|
Re: Thin black air filter foam
Air-Filter-Foam-Sheet-Black-anti-dust-60-PPI-15-PPI-thick-50mm-3mm-AD62-LW-/
has 3mm sheet, in many sizes. It ships from China. Two square meters is US $20.55. That should last a long time, or take care of a lot of equipment. They have smaller sizes, at various prices.
toggle quoted message
Show quoted text
-----Original Message----- From: "'David C. Partridge' david.partridge@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
Sent: Jul 14, 2017 4:29 AM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] Thin black air filter foam
In the USA perhaps where most places have air-con and even hardware stores!!! Sadly ¡°the local hardware store¡± is long gone over here ¡ I¡¯ve never seen anything like it in the ¡°DIY¡± stores here in the UK L
I thought the stuff offered on eBay a bit spendy and even though I found it a bit cheaper on Amazon, in the end I cut down one of those green nylon scouring pads which cost next to nothing and looks to have a similar pore size.
Dave
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: 14 July 2017 07:47
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Thin black air filter foam
Local hardware store, a couple of dollars for a huge piece.
Michael A. Terrell
|
Re: Thin black air filter foam
In the USA perhaps where most places have air-con and even hardware stores!!!? Sadly ¡°the local hardware store¡± is long gone over here ¡ I¡¯ve never seen anything like it in the ¡°DIY¡± stores here in the UK L ? I thought the stuff offered on eBay a bit spendy and even though I found it a bit cheaper on Amazon, in the end I cut down one of those green nylon scouring pads which cost next to nothing and looks to have a similar pore size. ? Dave ?
toggle quoted message
Show quoted text
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: 14 July 2017 07:47
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Thin black air filter foam?
Local hardware store, a couple of dollars for a huge piece. ?
|
Re: Thin black air filter foam
Local hardware store, a couple of dollars for a huge piece. ?
On Friday, July 14, 2017, 1:10 AM, 'David C. Partridge' david.partridge@... [hp_agilent_equipment] wrote:
?
About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.
Used on the air inlet where the fan exhausts the unit.
What's this darn stuff called and where to get it (in UK ideally)?
Thanks
Dave
|
Re: Thin black air filter foam
Darn! Thank you, that¡¯s the stuff!? The magic incantation seems to be computer dust filter! ? Thanks again Dave ? ?
toggle quoted message
Show quoted text
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: 14 July 2017 07:23
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Thin black air filter foam?
Something like this?
? ? About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.
Used on the air inlet where the fan exhausts the unit.
What's this darn stuff called and where to get it (in UK ideally)?
?
|
Re: Thin black air filter foam
Something like this? Neil G4DBN
toggle quoted message
Show quoted text
About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.
Used on the air inlet where the fan exhausts the unit.
What's this darn stuff called and where to get it (in UK ideally)?
|
Thin black air filter foam
About 2-3mm (maybe as much as 1/8") thick fairly open mesh, I've searched
eBay for air filter sheet failed to find anything suitable.
Used on the air inlet where the fan exhausts the unit.
What's this darn stuff called and where to get it (in UK ideally)?
Thanks
Dave
|
I am in need of a 08757-60066 mother board for a 8757C.
The 8757C that I bought cheap had a CPU battery leak and has made a mess
of the motherboard.
Before I remove, clean and rebuild the traces on this damaged mother
board, I though That I would ask the community if one is available from
a scrapped unit.
Appreciate any help.
Thanks
73
Glenn
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
---------------------------------------------------------------------------
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Re: Replace Neon NE-2 with Zener in 141T PSU?
Replacing the ZZ1000 - My Summary.
A high-voltage zener will add a lot of drift. It's a hassle to ovenize it.
Nine 9V zeners is better but still pretty bad. To meet spec you have to use what HP used, the 1N938, a special temperature-compensated part which costs over $10 each today.
That's too expensive.
It's a hassle to rework the board to use a single 1N938 the way HP did.
Ed Breya's TL431 suggestion is the only one that's cheap, easy, and pretty good. That's a TL431 plus a 65-75V zener. 150k and 4.7k in the divider gets you 82V. No other changes needed.
That's how I see it.
Dave Wise
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Re: Replace Neon NE-2 with Zener in 141T PSU?
Hi from down under.
From memory I used an 8.2K 1 watt resistor as that is what I had on hand.
Also placed 68V and 14V zeners in series to make the necessary 82V level and again this is what was in
junk box.
Hope that helps.
Cheers and 73's
Arie
VK3DBF
--------------------------------------------
toggle quoted message
Show quoted text
On Fri, 14/7/17, w7qed@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
Subject: Re: [hp_agilent_equipment] Replace Neon NE-2 with Zener in 141T PSU?
To: hp_agilent_equipment@...
Received: Friday, 14 July, 2017, 3:30 AM
?
Hi Arie,
I will
definitely try that first, removing the board does look like
a hassle.?
What value
of resistor did you end up with for R21 (5.4k is
stock)??
Thanks very
much,
--E
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Re: Wanted: HP Laserjet 4
Hi:
My HP 4050N with Duplex option got erratic so, after some research, got an HP LaserJet Pro M501DN (with Duplex and Networking). After some problems that were fixed by upgrading the printer firmware (I bought it new) and upgrading the drivers, it's very much like the 4050.
PS the problem was poor seating of the LAN card in the 4045. Removing it and reinstalling fixed the problem.
--
Have Fun,
Brooke Clarke
toggle quoted message
Show quoted text
-------- Original Message -------- Re: Wanted: HP Laserjet 4
|
Re: Wanted: HP Laserjet 4
Always thought it was funny that the HP 8150 and the Lexmark Optra N are almost exactly the same - only the control panel is different.
?
Have parts and toner. Just like having several of one piece of test gear. Swap parts, keep it running. As others have concurred, commercial equipment used in a home business lasts and lasts and lasts. Cheep to run and service.
LJ4's have gone sky high on the bay. 200$+! Most have 200k+ page count. Not willing to take a risk for that price.
Took Dave's advice. Bought an 8150DN, low page count. (26k) Seeing these units for sale with 1M+ imprints is common.
My choice was based on what would be supported in 10 years. LJ4's are 20 years old now. Nothing wrong with age. Parts are becoming difficult to find at a reasonable price, however.
Still have a rehabbed LJ4 (new fuser and total consumable parts PM) with all the extra parts and toner. This one cost 60$ with 5 new OEM toner cartridges. That's a metric ton of printing. It's in a storage trailer. Due to the new abode, I'll see that stuff shortly before the snow flies. No use to me now. Compare the cost (including consumables) of a rehabbed commercial printer with a wally world special or one aimed at small offices, (assuming that you're capable and willing to do the work yourself ), makes these an affordable alternative.
|
Re: Wanted: HP Laserjet 4
Depends on whether it's been rehabbed. Think the fuser is rated for 60k. Service manual shows intervals.
The bay shows many units for sale with 200k+. Starting at $200. Think I paid 75$ for a complete consumables kit minus the fuser. (rollers, gears, pads, etc.) Takes 45 minutes to do. (took me an hour prep time to make sure I knew what to do.)
Most well made things run for a long, long time if the prescribed preventative maintenance is done.
?
Okay I got the page count.? It's 56110.? Is that a high or low figure?
Bob
This one does a better job with the sub models, including the second test page:
On Thu, Jul 13, 2017 at 1:19 PM, Norm n3ykf < normanlizeth@...> wrote: > > > Take care! One of the settings in this menu tells it to continue printing > test pages forever....................... ..... > > Check your printer for it's actual part number. Some are slightly different, > so a trip to the manual may be necessary. Not all LJ4's are LJ4's. They were > produced for more than a few years and saw high penetration into the > gov/biz/edu market. > > IIRC there are two test pages. One gives setup info, the other gives printer > engine details and installed option data. > > Playing in our "Obsolete world" gives me hours and hours of quality > entertainment. > > Norm > ------------------------------ ------
Posted by: Norm n3ykf <normanlizeth@...>
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Re: Wanted: HP Laserjet 4
Okay I got the page count.? It's 56110.? Is that a high or low figure?
Bob
On Thursday, July 13, 2017 10:49 AM, "Norm n3ykf normanlizeth@... [hp_agilent_equipment]" wrote:
This one does a better job with the sub models, including the second test page:
On Thu, Jul 13, 2017 at 1:19 PM, Norm n3ykf < normanlizeth@...> wrote: > > > Take care! One of the settings in this menu tells it to continue printing > test pages forever............................ > > Check your printer for it's actual part number. Some are slightly different, > so a trip to the manual may be necessary. Not all LJ4's are LJ4's. They were > produced for more than a few years and saw high penetration into the > gov/biz/edu market. > > IIRC there are two test pages. One gives setup info, the other gives printer > engine details and installed option data. > > Playing in our "Obsolete world" gives me hours and hours of quality > entertainment. > > Norm > ------------------------------------ Posted by: Norm n3ykf < normanlizeth@...> ------------------------------------ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: ? ? <*> Your email settings: ? ? Individual Email | Traditional <*> To change settings online go to: ? ? ? ? (Yahoo! ID required) <*> To change settings via email: ? ? hp_agilent_equipment-digest@... ? ? hp_agilent_equipment-fullfeatured@...<*> To unsubscribe from this group, send an email to: ? ? hp_agilent_equipment-unsubscribe@...<*> Your use of Yahoo Groups is subject to: ? ?
|
Re: Asymmetric trace "dot" on Hp 141-T display section
????????? Its been many years since I worked on a 141 but
it seems to me it has an astigmatism adjustment in it. Listed in
the handbook somewhere. Correcting this effect is what its for.
You need to juggle between it and the focus to find the sharpest
dot.
On 7/13/2017 10:39 AM, w7qed@...
[hp_agilent_equipment] wrote:
Hi All,
On my recently acquired HP-141T,???8554B and
8552B plugins, I noticed that the trace has a sort of vertical
thickness to it, as though someone is drawing the traces using
a calligraphy pin oriented vertically. Horizontally, the trace
is very sharp. Adjusting the focus makes it possible to bring
the "dot" to a symmetric and round but fuzzier shape. I am
using the "manual sweep" mode to judge the shape of the dot.
The total height of the dot, vertically, is probably 4 or 5
mm.???
I then
connected a tek 475 scope to the Vertical and Scan outputs.
With the scope in XY mode, the trace is super crisp and does
not have a vertical elongation to it. I think this test
exonerates the plugins from causing the issue, but leaves the
display section in question.
Thanks
for any insights you may have,???
--Elliott
W6EL
???
--
Richard Knoppow
dickburk@...
WB6KBL
|
Asymmetric trace "dot" on Hp 141-T display section
Hi All,
On my recently acquired HP-141T,?8554B and 8552B plugins, I noticed that the trace has a sort of vertical thickness to it, as though someone is drawing the traces using a calligraphy pin oriented vertically. Horizontally, the trace is very sharp. Adjusting the focus makes it possible to bring the "dot" to a symmetric and round but fuzzier shape. I am using the "manual sweep" mode to judge the shape of the dot. The total height of the dot, vertically, is probably 4 or 5 mm.?
I then connected a tek 475 scope to the Vertical and Scan outputs. With the scope in XY mode, the trace is super crisp and does not have a vertical elongation to it. I think this test exonerates the plugins from causing the issue, but leaves the display section in question.
Thanks for any insights you may have,?
--Elliott W6EL
?
|
Re: Replace Neon NE-2 with Zener in 141T PSU?
Hi Arie,
I will definitely try that first, removing the board does look like a hassle.?
What value of resistor did you end up with for R21 (5.4k is stock)??
Thanks very much,
--E
|
Michael A. Terrell
David C. Partridge