Re: 141T reference replacement..a cure??
I'm afraid that radiologically enhanced neon bulbs are
pretty much a thing of the past. Once, the public viewed
the use of radioactive materials as being new and sciency.
Now, they are terrified... and the regulations are to match.
Once upon a time, I had a pair of steel enveloped reference
tubes, of this sort (really tiny, grain of rice sized) that
were hot as hell gamma wise. They were made for bomb fuses,
and were pulled from the trash by some dead relative of mine
at Diamond Ordinance and Fuse Labs in the '50s.
Tektronix scopes of the 513D era were full of glass cased,
silver covered neon like reference tubes that kick up the
geiger counter quite well.
I doubt one could economically run a production line that
made tubes like that anymore, what with the regulations
picture. The demise of the "radium girls" made that a
pretty sure thing.
-Chuck Harris
Jeremy Nichols jn6wfo@... [hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
There might be some NOS parts somewhere but neither Google nor eBay brings
up anything for "Signalite 82R7."
Jeremy
On Sat, Jul 15, 2017 at 7:09 PM Doug dmcgarrett@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
On 07/15/2017 05:00 PM, Bob Goodrich bobgoodrich84@...
[hp_agilent_equipment] wrote:
Signalite 82R7 Wonder if it's still available. That was a l o n g time ago!
|
Re: 141T reference replacement..a cure??
They really shouldn't. The aging problem is due to
sputtering of the electrode material onto the glass
envelope. This evaporated metal travels to the glass,
and knocks gas molecules/atoms to the surface where
they get permanently stuck in the sputtered metal.
Kind of a crude vacuum pump that eliminates the
very important gas from the envelope.
-Chuck Harris
'Gary Appel' garyappel@... [hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
Wouldn¡¯t NOS parts have the same problem from age?
Gary Appel
From: mailto:hp_agilent_equipment@...
Sent: Saturday, July 15, 2017 6:09 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: 141T reference replacement..a cure??
These guys claim to have a Z82R10 available for $5.95. It might be a suitable replacement.
It might require a change in the series Resistor R21.
|
Re: 141T reference replacement..a cure??
Ah! Way better than my memory! Thanks for the reference.
-Chuck Harris
Bob Goodrich bobgoodrich84@... [hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
Below is a link to a Signalite application note pamphlet..Page 14 has the Z series of VR tubes.
www.philbrickarchive.org/jlrmsousa/signalite_glow_lamps.pdf
Bob
|
Re: HP 8566B / 8568B bus interconnect cable
I have indeed opened the connectors and inspected the connections. From what I can tell, they all look OK, although due to the density of the connections, it is hard to get a good look at the middle row. In any case, if it was due to faulty connection(s), the cable would not work with either instrument, would it?
|
Re: Replace Neon NE-2 with Zener in 141T PSU?
Most of the trouble in the PSU pcb seems to stem from overheating, due to the fact that there`s very little moving air. I used a chassis punch to make a couple of holes in the bulkheads downstream of the fan to help with this. Cheers!......Don Collie ZL4GX
?
There are two phenomena going on here.
The reason that there is a radioisotope inserted
into "neon" references, is the neon strikes at
a different voltage when exposed to light, vs dark.
This is an always thing.
The second thing that happens is the neon gas
gets buried into the glass envelop by the
sputtered electrode material trapping it against
the glass envelope. Sputtering changes the
composition, and pressure, of the gas mixture,
which changes the overall characteristics of
the tube.
So, if you have a neon voltage *reference*, it will
always have some radioactive material sintered into
the electrodes to prevent light/dark strike voltage
differences.
If the neon reference has changed its gas composition
too much to strike, for whatever reason, it will have
the wrong voltage reference value too... regardless
of what you do to make it strike.
As to whether adding light of this or that energy
will cause the neon reference to strike over, that
it happens at all is the result of the photoelectric
effect, where stray electrons are created by the
glass envelope, and the electrodes, when the photons
strike. Ultimately, it is the electrons that reduce
the strike-over voltage (see Paschen's law for
more info).
-Chuck Harris
David Wise david_wise@... [hp_agilent_equipment] wrote:
> Would you guys slow down long enough for me to type a reply? :)
>
>
> Tom, Dave,
>
>
> I wish. But the glass stops beta. The Kr-85 worked because it was inside.
>
>
> Bob, Elliott,
>
>
> So many parts in series... sometimes brute force is the best solution, but this
> one puts me off. That's just my personal taste; if you want to do it, knock
> yourself out.
>
>
> Elliott,
>
>
> HP used 1% metal film resistors. The pot is a weak point for long-term stability,
> but I think that since it's in a voltage divider the high-leg tempco compensates
> the low-leg tempco.
>
>
> In a related thread, Alan Melia suggests adding a LED to illuminate the gas tube.
> If the problem was dark effect, brought on by Kr-85 depletion, that should work
> around it just dandy. I hope someone tries it. I can't, my ZZ1000 is still
> working. If I can find a flickering neon at home, I'll try to figure out what
> wavelength LED is the most effective. It will be visible light, not UV, the glass
> blocks UV, same as external nuclear radiation.
>
>
> Dave Wise?
>
>
> ______________________________ __ From: hp_agilent_equipment@yahoogroups.com
> < hp_agilent_equipment@yahoogroups.com> on behalf of Tom Gardner tggzzz@...
> [hp_agilent_equipment] < hp_agilent_equipment@yahoogroups.com> Sent: Friday, July
> 14, 2017 2:18 PM To: hp_agilent_equipment@yahoogroups.com Subject: Re:
> [hp_agilent_equipment] Re: Replace Neon NE-2 with Zener in 141T PSU?
>
>
>
> Or to a supermarket and find the "LoSalt". Replacing part of the NaCl with KCl
> inevitably includes K40 :)
>
>
>
> On 14/07/17 22:15, Artek Manuals
> manuals@...< mailto: manuals@artekmanuals.com> [hp_agilent_equipment]
> wrote:
>
>
> Go down to one of those 2nd hand store with your geiger counter and find a very
> old $5 watch with the glow in the dark radium painted hands and dial. Peel of the
> minute hand and shrink tube it to the NE-2 :-)
>
>
> Dave manuals@...< mailto: manuals@artekmanuals.com>
>
>
>
> On 7/14/2017 5:06 PM, 'Alan Melia'
> Alan.Melia@...< mailto: Alan.Melia@btinternet.com> [hp_agilent_equipment]
> wrote:
>
>
> ?
>
> The thing is that most "zeners" do not depend on the Zener effect. That only
> occurs around voltages up to around 4volts, above 5v the process is Avalanche
> Breakdown , a bit like a gas tube. Then the temperature coefficient of these two
> processes have opposite senses so if you combine a true Zener with a forward diode
> or an avalanche diode you can minimise the tempco. The lowest tempcos are usually
> around 5 to 6v."zeners".
>
> Alan G3NYK ----- Original Message ----- From: Bob Albert bob91343@...
> [hp_agilent_equipment] bob91343@...%20[hp_ agilent_equipment]> To:
> hp_agilent_equipment@yahoogroups.comhp_ agilent_equipment@yahoogroups. com>
> Sent: Friday, July 14, 2017 9:16 PM Subject: Re: [hp_agilent_equipment] Re:
> Replace Neon NE-2 with Zener in 141T PSU?
>
> Actually I think the lowest temperature coefficient is around 5V for zener diodes.
> The 6.2 V units are very stable also so you don't need as many of those.
>
> When you put zeners in series you invoke the concern of impedance. Low voltage
> zeners have a fairly high impedance compared to just a few higher voltage ones.
> So if the current through it changes, so will the voltage.
>
> There are more elegant solutions to this 'problem' but the whole thread is
> probably more trouble than it's worth.
>
> Let us know your re sults.
>
> Bob
>
>
> On Friday, July 14, 2017 1:00 PM, "w7qed@...
> [hp_agilent_equipment]"< mailto: w7qed@...[hp_ agilent_equipment]>
> < hp_agilent_equipment@yahoogroups.com>hp_ agilent_equipment@yahoogroups. com>
> wrote:
>
>
>
>
> 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
>
>
>
>
>
>
>
> -- Dave Manuals@...< mailto: Manuals@ArtekManuals.com>
> <>
>
> [ https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif]<>
> Virus-free.
> <>
>
>
>
>
>
|
Re: Anybody got a good LCR meter that they want to sell?
I agree!
The ultracheap testers are all based on this (AFAIK)
Given its price it is an amazing little gadget. Not just LCR, but measures and identifies transistors and FET's.
No it's not a precision instrument but a very very hand gadget in the toolbox.
/Lasse
16 juli 2017 00:20:30 +02:00, skrev 'Dr. David Kirkby (Kirkby Microwave Ltd)' drkirkby@... [hp_agilent_equipment] :
|
Re: 141T reference replacement..a cure??
Wouldn¡¯t NOS parts have the same problem from age?
?
Gary Appel
toggle quoted message
Show quoted text
Sent: Saturday, July 15, 2017 6:09 PM
Subject: Re: [hp_agilent_equipment] Re: 141T reference
replacement..a cure??
?
?
These guys claim to have a
Z82R10? available for $5.95. It might be a suitable replacement.
It might require a change in the
series Resistor?? R21.
?
?
|
Re: 141T reference replacement..a cure??
These guys claim to have a Z82R10? available for $5.95. It might be a suitable replacement.
It might require a change in the series Resistor?? R21.
See the signalite application notes page 14
Bob
On Saturday, July 15, 2017 8:23 PM, "Jeremy Nichols jn6wfo@... [hp_agilent_equipment]" wrote:
?
There might be some NOS parts somewhere but neither Google nor eBay brings up anything for "Signalite 82R7."
Jeremy?
?
On 07/15/2017 05:00 PM, Bob Goodrich bobgoodrich84@...
[hp_agilent_equipment] wrote:
> Signalite 82R7
Wonder if it's still available. That was a l o n g time ago!
|
Re: 141T reference replacement..a cure??
There might be some NOS parts somewhere but neither Google nor eBay brings up anything for "Signalite 82R7."
Jeremy?
?
On 07/15/2017 05:00 PM, Bob Goodrich bobgoodrich84@...
[hp_agilent_equipment] wrote:
> Signalite 82R7
Wonder if it's still available. That was a l o n g time ago!
|
Re: Anybody got a good LCR meter that they want to sell?
On 07/15/2017 06:04 PM, Bob Albert
bob91343@... [hp_agilent_equipment] wrote:
?
I wasn't
comparing the units in detail.? For the vast majority of
measurements, the cheaper one is more than adequate.? I
am sure your extra money does buy some functionality but
for me, I have better instruments and only use the cheap
one for casual tests.
It's
great for identifying solid state components, such as
FETs and bipolars.? Measurements on common value
resistors and capacitors and inductors are accurate
enough for me, mostly.? A nice feature of these testers
is that it's 'quick and dirty' meaning you don't have to
be too careful, and you don't even have to know the kind
of component you are testing.? With my fancy bridge I
have to decide if it's R, L, or C, and it won't do solid
state parts.
After
all, it's only a few bucks, and money well spent.
Bob
On
Saturday, July 15, 2017 3:25 PM, "'Dr. David
Kirkby (Kirkby Microwave Ltd)'
drkirkby@...
[hp_agilent_equipment]"
wrote:
I've been reading this thread for a while, but I never saw the name
or model number of "the Hungarian one." Could someone please mention
it?
Thanx.--doug, WA2SAY
|
Re: 141T reference replacement..a cure??
On 07/15/2017 05:00 PM, Bob Goodrich bobgoodrich84@... [hp_agilent_equipment] wrote: Signalite 82R7 Wonder if it's still available. That was a l o n g time ago!
|
Re: Anybody got a good LCR meter that they want to sell?
On Sat, 15 Jul 2017, Bob Albert bob91343@... [hp_agilent_equipment] wrote: If you want something that measures actual values with good precision go buy DE-5000. Buy original one, from Japan. It is not $10 crap but it is not crap, it is a REAL instrument. With a proper case, properly calibrated at the factory, with warranty and so on. I have one myself for field trips and it is superior to anything you can get for such a price. It is well within stated tolerance out of the box -- I have a calibrated Quadtech (GenRad) 1693 DigiBridge so I can check. I wasn't comparing the units in detail.? For the vast majority of measurements, the cheaper one is more than adequate.? I am sure your extra money does buy some functionality but for me, I have better instruments and only use the cheap one for casual tests.
It's great for identifying solid state components, such as FETs and bipolars.? Measurements on common value resistors and capacitors and inductors are accurate enough for me, mostly.? A nice feature of these testers is that it's 'quick and dirty' meaning you don't have to be too careful, and you don't even have to know the kind of component you are testing.? With my fancy bridge I have to decide if it's R, L, or C, and it won't do solid state parts.
After all, it's only a few bucks, and money well spent.
Bob
On Saturday, July 15, 2017 3:25 PM, "'Dr. David Kirkby (Kirkby Microwave Ltd)' drkirkby@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:
#yiv7719345204 #yiv7719345204 -- #yiv7719345204 .yiv7719345204ygrp-photo-title{clear:both;font-size:smaller;min-height:15px;overflow:hidden;text-align:center;width:75px;}#yiv7719345204 div.yiv7719345204ygrp-photo{background-position:center;background-repeat:no-repeat;background-color:white;border:1px solid black;min-height:62px;width:62px;}#yiv7719345204 div.yiv7719345204photo-title a, #yiv7719345204 div.yiv7719345204photo-title a:active, #yiv7719345204 div.yiv7719345204photo-title a:hover, #yiv7719345204 div.yiv7719345204photo-title a:visited {text-decoration:none;}#yiv7719345204 div.yiv7719345204attach-table div.yiv7719345204attach-row {clear:both;}#yiv7719345204 div.yiv7719345204attach-table div.yiv7719345204attach-row div {float:left;}#yiv7719345204 p {clear:both;padding:15px 0 3px 0;overflow:hidden;}#yiv7719345204 div.yiv7719345204ygrp-file {width:30px;}#yiv7719345204 div.yiv7719345204attach-table div.yiv7719345204attach-row div div a {text-decoration:none;}#yiv771934! 5204 div.yiv7719345204attach-table div.yiv7719345204attach-row div div span {font-weight:normal;}#yiv7719345204 div.yiv7719345204ygrp-file-title {font-weight:bold;}#yiv7719345204 #yiv7719345204 #yiv7719345204 #yiv7719345204 --#yiv7719345204ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv7719345204 #yiv7719345204ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv7719345204 #yiv7719345204ygrp-mkp #yiv7719345204hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv7719345204 #yiv7719345204ygrp-mkp #yiv7719345204ads {margin-bottom:10px;}#yiv7719345204 #yiv7719345204ygrp-mkp .yiv7719345204ad {padding:0 0;}#yiv7719345204 #yiv7719345204ygrp-mkp .yiv7719345204ad p {margin:0;}#yiv7719345204 #yiv7719345204ygrp-mkp .yiv7719345204ad a {color:#0000ff;text-decoration:none;}#yiv7719345204
On 15 July 2017 at 16:37, Bob Albert bob91343@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
That is a good unit for not too demanding applications.? However, it's available on ebay for a lot less money.? In some cases, less than $10 shipped.
I have a similar one and use it a lot.
Bob
Are you saying that the Hungarian $55 one can be had on eBay for $10? I don't think so. The Hungarian one seems to be well thought out in design, whereas none of the other cheap one seem to be.
The Hungarian one use 4-wire sending, which few on eBay do unless you pay lots of money.
Dave
--- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * * [Non-text portions of this message have been removed]
|
Re: Anybody got a good LCR meter that they want to sell?
I wasn't comparing the units in detail.? For the vast majority of measurements, the cheaper one is more than adequate.? I am sure your extra money does buy some functionality but for me, I have better instruments and only use the cheap one for casual tests.
It's great for identifying solid state components, such as FETs and bipolars.? Measurements on common value resistors and capacitors and inductors are accurate enough for me, mostly.? A nice feature of these testers is that it's 'quick and dirty' meaning you don't have to be too careful, and you don't even have to know the kind of component you are testing.? With my fancy bridge I have to decide if it's R, L, or C, and it won't do solid state parts.
After all, it's only a few bucks, and money well spent.
Bob
On Saturday, July 15, 2017 3:25 PM, "'Dr. David Kirkby (Kirkby Microwave Ltd)' drkirkby@... [hp_agilent_equipment]" wrote:
|
Re: 141T reference replacement..a cure??
Below is a link to a Signalite application note pamphlet.. Page 14 has the Z series of VR tubes.
www.philbrickarchive.org/jlrmsousa/signalite_glow_lamps.pdf
Bob
On Saturday, July 15, 2017 1:44 PM, "Chuck Harris cfharris@... [hp_agilent_equipment]" wrote:
?
Ok, good question.
This thread is nominally about the voltage reference in
the 141T, older models, that was a gas regulator tube,
that looked like an oversized NE2.
It has been a very long time since I abandoned the 141T
series as being useful, but I recall the problematic gas
reference tube that looks like a large NE2. Others that
I respect have informed during this thread that they are
89V.
Do you know differently?
Since 87V is neither the 67V nor the 89V that I mentioned,
you could be talking about the NE2's ionization voltage,
I am not sure...
That is even older information I got from my dad, back
when I was a teenager, some nearly 50 years ago. I have
seen 90V strike, and 67V ionization as the nominal values
for the NE2 many times over the years. But I never would
use one as a reference, so its exact value is unimportant
to me.
-Chuck Harris
ken chalfant kpchalfant@... [hp_agilent_equipment] wrote:
> Hi Chuck,
>
> Without any disrespect or challenge intended¡
>
> How, sir, do you know these ionize around 87 volts?
>
> Thank you.
>
> Regards,
>
> Ken
>
>
> On 15Jul, 2017, at 7:20 AM, Chuck Harris cfharris@... [hp_agilent_equipment] > wrote:
>
>
> They aren't NE2's. NE2's run at about 67V, these run at about 89V.
>
> -Chuck Harris
>
> Scott McGrath scott@... [hp_agilent_equipment] wrote:
>> Just visit Amazon 10 NE-2's for 8 bucks problem solved
>>
>> https://www.amazon.com/A3C-NE2-U-Bulbs-105-125-Terminals/dp/B00ZSPLRVS
|
Re: Anybody got a good LCR meter that they want to sell?
Dr. David Kirkby (Kirkby Microwave Ltd)
|
Re: 141T reference replacement..a cure??
A number of my antiques use neon bulbs as voltage references; it seems to be common in HP (and other?) instruments of that era. I too have read about (and experienced) SA plug-in fuses blowing because of an aged neon that did not strike at the proper voltage (so it was said). From my manuals I have the following:
143A Oscilloscope (large CRT, otherwise same as 140A): the +100V supply uses a neon rated in the schematic and parts list at "82.0V +/- 1.0V" (part #1940-0013). No "NE-number" is provided in parts list or schematic.
132A Dual Beam Osilloscope uses an NE86 in the control amplifier of the high-voltage power supply's regulator circuitry. The oscilloscope circuitry itself is full of NE2's (2140-0084) and NE86's (2140-0055). No voltage rating is provided in the manual.?
175A Oscilloscope uses NE-2's (2140-0008) throughout the circuitry. Most of them are placed between the grids and cathodes of vacuum tubes used as amplifiers and (especially) cathode followers. The low-voltage power supply uses no neons but rather a 5651 (vacuum tube-shaped) gas-discharge tube rated at 87 volts. Similar in operation to a neon, I suppose, but larger, easier to replace, perhaps longer-lasting and more reliable, and certainly more expensive.
Interesting that HP uses NE-2's under two different part numbers (2140-0008 and 0084). My manuals do not provide solid data on the strike or operating voltages of these neons. None are explicitly marked as "selected" or "special."?
Jeremy
?
Ok, good question.
This thread is nominally about the voltage reference in
the 141T, older models, that was a gas regulator tube,
that looked like an oversized NE2.
It has been a very long time since I abandoned the 141T
series as being useful, but I recall the problematic gas
reference tube that looks like a large NE2. Others that
I respect have informed during this thread that they are
89V.
Do you know differently?
Since 87V is neither the 67V nor the 89V that I mentioned,
you could be talking about the NE2's ionization voltage,
I am not sure...
That is even older information I got from my dad, back
when I was a teenager, some nearly 50 years ago. I have
seen 90V strike, and 67V ionization as the nominal values
for the NE2 many times over the years. But I never would
use one as a reference, so its exact value is unimportant
to me.
-Chuck Harris
ken chalfant kpchalfant@... [hp_agilent_equipment] wrote:
> Hi Chuck,
>
> Without any disrespect or challenge intended¡
>
> How, sir, do you know these ionize around 87 volts?
>
> Thank you.
>
> Regards,
>
> Ken
>
>
> On 15Jul, 2017, at 7:20 AM, Chuck Harris cfharris@...cfharris@...> [hp_agilent_equipment] <hp_agilent_equipment@...hp_agilent_equipment@...>> wrote:
>
>
> They aren't NE2's. NE2's run at about 67V, these run at about 89V.
>
> -Chuck Harris
>
> Scott McGrath scott@...scott@...> [hp_agilent_equipment] wrote:
>> Just visit Amazon 10 NE-2's for 8 bucks problem solved
>>
>>
|
Re: 141T reference replacement..a cure??
My 141T has a Z82R7? reference tube in it.? As of 8/21/14 the voltage across the VR tube was measured at 83.6 instead of 82.7 V.
I had to shunt R26? 22.1K with 220K in order to? in order to be able to adjust the +100 Volt supply to 100V. Still working today.
The link below to Radio-Electronics magazine May 1965 has a brief reference to the Signalite 82R7 VR tube.?
See page 65
Bob
On Saturday, July 15, 2017 1:44 PM, "Chuck Harris cfharris@... [hp_agilent_equipment]" wrote:
?
Ok, good question.
This thread is nominally about the voltage reference in
the 141T, older models, that was a gas regulator tube,
that looked like an oversized NE2.
It has been a very long time since I abandoned the 141T
series as being useful, but I recall the problematic gas
reference tube that looks like a large NE2. Others that
I respect have informed during this thread that they are
89V.
Do you know differently?
Since 87V is neither the 67V nor the 89V that I mentioned,
you could be talking about the NE2's ionization voltage,
I am not sure...
That is even older information I got from my dad, back
when I was a teenager, some nearly 50 years ago. I have
seen 90V strike, and 67V ionization as the nominal values
for the NE2 many times over the years. But I never would
use one as a reference, so its exact value is unimportant
to me.
-Chuck Harris
ken chalfant kpchalfant@... [hp_agilent_equipment] wrote:
> Hi Chuck,
>
> Without any disrespect or challenge intended¡
>
> How, sir, do you know these ionize around 87 volts?
>
> Thank you.
>
> Regards,
>
> Ken
>
>
> On 15Jul, 2017, at 7:20 AM, Chuck Harris cfharris@...<mailto:cfharris@...> [hp_agilent_equipment] > wrote:
>
>
> They aren't NE2's. NE2's run at about 67V, these run at about 89V.
>
> -Chuck Harris
>
> Scott McGrath scott@... [hp_agilent_equipment] wrote:
>> Just visit Amazon 10 NE-2's for 8 bucks problem solved
>>
>> https://www.amazon.com/A3C-NE2-U-Bulbs-105-125-Terminals/dp/B00ZSPLRVS
|
Re: HP 8566B / 8568B bus interconnect cable
Donald, Have you opened the connectors and inspected the connections on the 60220 cable?? From my experience this cable should also work with you 8566B.
-rastro
On Saturday, July 15, 2017 9:54 AM, "donald_s_58103@... [hp_agilent_equipment]" wrote:
?
The check instrument I ?red LED stays on after power-up and the display stays blank. After swapping the cables from one instrument to the other, I have found that the 60220 only works with my 8568B and not the 8566B and the 60094 only works with my 8566B and not the 8568B. WEIRD! (I am using the same IF/Display unit for both instruments).
|
Re: 141T reference replacement..a cure??
Ok, good question.
This thread is nominally about the voltage reference in
the 141T, older models, that was a gas regulator tube,
that looked like an oversized NE2.
It has been a very long time since I abandoned the 141T
series as being useful, but I recall the problematic gas
reference tube that looks like a large NE2. Others that
I respect have informed during this thread that they are
89V.
Do you know differently?
Since 87V is neither the 67V nor the 89V that I mentioned,
you could be talking about the NE2's ionization voltage,
I am not sure...
That is even older information I got from my dad, back
when I was a teenager, some nearly 50 years ago. I have
seen 90V strike, and 67V ionization as the nominal values
for the NE2 many times over the years. But I never would
use one as a reference, so its exact value is unimportant
to me.
-Chuck Harris
ken chalfant kpchalfant@... [hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
Hi Chuck,
Without any disrespect or challenge intended¡
How, sir, do you know these ionize around 87 volts?
Thank you.
Regards,
Ken
On 15Jul, 2017, at 7:20 AM, Chuck Harris cfharris@...<mailto:cfharris@...> [hp_agilent_equipment] <hp_agilent_equipment@...<mailto:hp_agilent_equipment@...>> wrote:
They aren't NE2's. NE2's run at about 67V, these run at about 89V.
-Chuck Harris
Scott McGrath scott@...<mailto:scott@...> [hp_agilent_equipment] wrote:
Just visit Amazon 10 NE-2's for 8 bucks problem solved
|
hi cliff second mail..10 ghz info......today have had over 50 mails for yahoo groups,,,,none to do with my request..so will mail them again tomorrow,,, to stop.....
right 10 ghz ...GB3FY..located at farmer parrs? fleetwood,,,not got the locator handy......its out put? is 10.240ghz...tx input ..10.425.ghz .......... test card shows gb3fy,,,and amiddle signal bar,,,with id numbers underneath,,,when signal strenght improves....if a carier,,no video is sent...... a red bar goes accross screen,,,,also denotes strenght,,,,if a signal tx,,10.425 is sent with video on..the bar will indicate strenght,,,in green...... and nunber under the strenght......every 10 mins the ident signal changes for test card id,,to colour information..and sound channel info..for talk back...unfortunatly i think the tx and rx mast is too low,,as i have two hill in front of me ,,bourne hill ..then the golf links on fleetwood road,,, then the hill at warbreck..so a blockage south...!!!!!fartest we have seen is I.O.M. at 2000 ft,,up..and wales 1000 ft up..p3 to p4 pics,,audio..... difficult over distance,,,also a new? repeater is on air,,at warbreck hill...1.3ghz? at mo..1249 actuall..digital and analogue?? not on at all times,,, call sign,,,GB3FT......IF BOTH ARE?? QRZ on net info will come up..gb3ft need dtmf codes,,,which are avail to atv guys,,via tim,,,at freckleton,, or steve at warbreck...cant give much more info....we have probs receiving welsh and signals south of here,,cannot get gb3ud,,,at mow cop... in cheshire,,above 1000 ft we can usually get,,,!!!so manchest er may be a prob..unless high up...ok on twt.s..wow..i get severheadaches with 10 mw..at 10 ghz,,so leaving off 10 at mo...hope inf o help full...will let you know how i go on.....many thanks,,,your friend ,,can have my e mail add
if he ned s any questions answered,,,,,,,byeeee40 watts into a 32 db ...10 ghz dish,,,wow...4kw out erp....!!!!!guessing.....but will kep away.
bob.ocall
From: "Cliff Barber g4bgp@... [hp_agilent_equipment]"
To: "hp_agilent_equipment@..."
Sent: Tuesday, 11 July 2017, 11:49
Subject: Re: [hp_agilent_equipment] ifr 2390 analyser
?
Hello Bob, Please call me on either landline or mobile. Tnx Cliff G4BGP On Tue, 11 Jul 2017 at 10:57, Bob Ocallaghan bob.g1epl@... [hp_agilent_equipment] wrote:
?
hi am looking for software to operate a marconi ifr spec anl..model 2390...and info on applying to analyser,or where i can get? installed..many thanks bob..uk.
|
Jeremy Nichols
Sergey Kubushyn