Hi Folks,
I've been installing option 011 (HPIB) on my HP5328a counter wich has a bleu wire for arming wich goes to a pin behind the operating panel. In my counter that is also the pin where Channel C gets its arming with a blue wire as well. What to do just parallel them?
Bas.
|
Re: HP 8556A plugin required for an HP141T
Hi MK whereaboutsare you in the UK? I will have to check but I may have a spare frame, though Iam not sure what state its in.
Alan
G3NYK
toggle quoted message
Show quoted text
----- Original Message ----- From: "m1k3k1" <m1k3k1@...> To: <hp_agilent_equipment@...> Sent: Wednesday, December 26, 2012 8:45 PM Subject: [hp_agilent_equipment] HP 8556A plugin required for an HP141T As title, I an in the UK, so would prefer to get one from the UK or europe as postage and vat would make it expensive otherwise
Aslo would like to get hold of a non-working HP141T chassis, dont mind if the tube is gone, but also best to source from UK as they are quite heavy. would want to use the dead one for spares to keep the other one going.
Regards,
M K
------------------------------------
Yahoo! Groups Links
|
HP 8556A plugin required for an HP141T
As title, I an in the UK, so would prefer to get one from the UK or europe as postage and vat would make it expensive otherwise
Aslo would like to get hold of a non-working HP141T chassis, dont mind if the tube is gone, but also best to source from UK as they are quite heavy. would want to use the dead one for spares to keep the other one going.
Regards,
M K
|
We moved from there when I was five years old. I never knew that there
was as many electronics companies in the area as you list.
Dave
toggle quoted message
Show quoted text
On 12/24/2012 4:16 PM, petepdx1955 wrote:
There were two companies with Boonton in their name
Boonton Electronics. Now a division of a British company boonton.com
if interested.
Their two biggest contributions were a C and L bridges that ran at 1
MHz, and a power meter head using diodes.
Boonton Radio Corporation or BRC. These are the guys HP bought. The
Q-Meter is prob the biggest contribution, but they did a few other
things very well one of which was generators that could FM better then
any one else at the time.
The area around Boonton was quite the concentration, all basically
springing from a company called Ferris Instruments. Ballentine was
another off shoot.
Another company not into instruments but in the same area was Aircraft
Radio Corp, or ARC.
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>, Dave Daniel
<kc0wjn@...> wrote:
Wow. I didn't know HP bought Boonton. I always liked Boonton
instruments, probably because I was born in Boonton. When did HP buy
them?
Dave
On 12/21/2012 12:59 PM, Max Robinson wrote:
I am looking for a couple of HP oldies. The 260A Q meter and the
250A RX
meter. I can't find any on eBay. These two instruments were
carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
<mailto:funwithtransistors-subscribe%40yahoogroups.com>
<mailto:funwithtransistors-subscribe%40yahoogroups.com>
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
<mailto:funwithtubes-subscribe%40yahoogroups.com>
<mailto:funwithtubes-subscribe%40yahoogroups.com>
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
<mailto:funwithwood-subscribe%40yahoogroups.com>
<mailto:funwithwood-subscribe%40yahoogroups.com>
|
Motorola MSPS7279 and MSPS7278 Transistors
I am looking for any data, substitute, or availability on these transistors. The 7279 is an NPN and the 7278 is a PNP silicon as best I can tell. They are both TO-220 type cases with an 'EBC' pin out.
The application uses 4 of these, with a 36.5 ohm resistor in series with the emitter, all in parallel, to make up a TO-66 type package transistor substitute for each of tne PNP and NPN application.
Thanks in advance.
Joe
|
Service manuals for 526C (2 x) and 560A for free!
Hi,
I'd like to give away the above mentioned service manuals for free. I only ask for refund of the shipping costs from Germany (registered mail for about US$ 8.00 to the US via PayPal).
Best regards
pudu51
|
Re: 608 output attenuator. and more
On 12/26/2012 12:53 AM, Patrick Wong wrote:
Hi Doug,
I'm not sure how the OP's test would distinguish between
1) a situation where the attenuator resistor(s) is/(are) open and he
is introducing a load of 50 ohms with the passthrough terminator, vs.
2) a situation where the attenuator resistor(s) is/(are) fine, and the
passthrough terminator is used.
In both 1) and 2), the voltage measurement will probably drop by ~50%
when the passthrough terminator is introduced.
I like your other post offering an alternate way to test without
access to an antenna bridge. That alternative assumes the existence of
another RF generator whose output is loaded by the 608 attenuator.
Patrick Wong AK6C
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>, Doug <dmcgarrett@...>
wrote:
...If all you are doing is adding and removing a 50 ohm resistor
across the 608 output, and measuring the output with a scope, then
the test would seem to be kosher, IF you use a high-impedance 10:1
scope probe...
<;_ylc=X3oDMTJyZzkzdDl1BF9TAzk3MzU5NzE0BGdycElkAzEwOTI5MzMzBGdycHNwSWQDMTcwNTA4MzY2MwRtc2dJZAM0ODcyNQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEzNTY1MDEyMTU-?act=reply&messageNum=48725>
The situation that Patrick envisions is somewhat unknown. I would guess that if the attenuator resistors were blown, then adding a 50 ohm load across the 608 output would probably cause the signal level to drop MORE than 50%, but it would depend on what's the actual impedance of the unterminated attenuator. So we may both be wrong! I suggested the measurement with another source of RF since the poster did not have an antenna analyzer, which of course, is another source of RF. (The antenna analyzer would have actually been my first attempt, because I do own one. But I also own another RF generator or two-- a Measurements Model 80 and two sweep generators that cover 10MHz.) doug, WA2SAY
|
Re: 608 output attenuator. more
On 12/26/2012 12:01 AM, Max Robinson wrote:
I don't have any antenna or RF impedance bridge that I trust. So the
50 ohm
termination and "infinite" impedance test is all I have.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
<mailto:funwithtransistors-subscribe%40yahoogroups.com>
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
<mailto:funwithtubes-subscribe%40yahoogroups.com>
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
<mailto:funwithwood-subscribe%40yahoogroups.com>
----- Original Message -----
From: "Patrick Wong" <patwong3@... <mailto:patwong3%40cox.net>>
To: <hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>>
Sent: Tuesday, December 25, 2012 9:16 PM
Subject: [hp_agilent_equipment] Re: 608 output attenuator.
Hi Max,
I'm not sure how this proves the attenuator is OK. If you use an
oscilloscope with the option to select between a 50 ohm input and a 1M ohm
input, the 50 ohm input will typically result in vertical deflection ~50%
of the high impedance input.
The use of a 50 ohm passthrough adapter on a 1M ohm input, is a reasonable
equivalent of selecting a 50 ohm input on the scope's vertical channel, at
least until you reach a sufficiently high frequency so the passthrough
adapter starts to display a reactance component.
If you have access to an antenna analyzer like an MFJ259B or MFJ269, then
you can measure the VSWR of the 608 antenna output. I would say that is a
reasonable test if you do not wish to remove the attenuator to physically
inspect and measure the resistor(s).
Patrick Wong AK6C
--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, "Max Robinson" <max@...>
wrote:
...Today I checked it again the way I had calibrated it
with a short cable and a pass through 50 ohm termination at the scope
end.
I set the frequency to 10 MHz and the attenuator to 100 mV to be sure
there
would be no proximity effect between the pickup coil and the output
tuned
circuit. With the scope reading 100 mV within accuracy spects I then
removed the termination and measured 200 mV within accuracy spects.
From
this I conclude that my output attenuator has not been damaged by
someone
transmitting into it.
Perhaps I misunderstood the measurement, since this thread has been running for a while. If all you are doing is adding and removing a 50 ohm resistor across the 608 output, and measuring the output with a scope, then the test would seem to be kosher, IF you use a high-impedance 10:1 scope probe. (Otherwise the input capacitance of the scope will degrade the results.) --doug, WA2SAY
|
Re: 608 output attenuator.
On 12/26/2012 12:01 AM, Max Robinson wrote:
I don't have any antenna or RF impedance bridge that I trust. So the
50 ohm
termination and "infinite" impedance test is all I have.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
<mailto:funwithtransistors-subscribe%40yahoogroups.com>
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
<mailto:funwithtubes-subscribe%40yahoogroups.com>
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
<mailto:funwithwood-subscribe%40yahoogroups.com>
----- Original Message -----
From: "Patrick Wong" <patwong3@... <mailto:patwong3%40cox.net>>
To: <hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>>
Sent: Tuesday, December 25, 2012 9:16 PM
Subject: [hp_agilent_equipment] Re: 608 output attenuator.
Hi Max,
I'm not sure how this proves the attenuator is OK. If you use an
oscilloscope with the option to select between a 50 ohm input and a 1M ohm
input, the 50 ohm input will typically result in vertical deflection ~50%
of the high impedance input.
The use of a 50 ohm passthrough adapter on a 1M ohm input, is a reasonable
equivalent of selecting a 50 ohm input on the scope's vertical channel, at
least until you reach a sufficiently high frequency so the passthrough
adapter starts to display a reactance component.
If you have access to an antenna analyzer like an MFJ259B or MFJ269, then
you can measure the VSWR of the 608 antenna output. I would say that is a
reasonable test if you do not wish to remove the attenuator to physically
inspect and measure the resistor(s).
Patrick Wong AK6C
--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, "Max Robinson" <max@...>
wrote:
...Today I checked it again the way I had calibrated it
with a short cable and a pass through 50 ohm termination at the scope
end.
I set the frequency to 10 MHz and the attenuator to 100 mV to be sure
there
would be no proximity effect between the pickup coil and the output
tuned
circuit. With the scope reading 100 mV within accuracy spects I then
removed the termination and measured 200 mV within accuracy spects.
From
this I conclude that my output attenuator has not been damaged by
someone
transmitting into it.
It would be better if nobody top-posts. That having been said; As you place and remove the 50 Ohm load, you are mismatching THE GENERATOR, such that the signal may vary by 2:1. If you want the test to make sense, you need to connect the generator output thru a fairly large series resistor--say 470 ohms--to the 608 input port. Connect your scope thru a 10:1 probe to that same input port. Now, with that connected, add a 51 ohm resistor in parallel with the 608 input. If the scope reading drops by about 50%, then the 608 has a 50 ohm impedance at the port. If it drops by quite a bit more than 50%, then the 608 has a higher impedance than 50 Ohms, and there would appear to be a problem with the attenuator circuit. BTW, if you don't have a scope, a high-impedance VTVM that will read at 10 MHz (it doesn't have to be accurate) will work similarly. Doug, WA2SAY
|
Re: 608 output attenuator.
I don't have any antenna or RF impedance bridge that I trust. So the 50 ohm termination and "infinite" impedance test is all I have.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
toggle quoted message
Show quoted text
----- Original Message ----- From: "Patrick Wong" <patwong3@...> To: <hp_agilent_equipment@...> Sent: Tuesday, December 25, 2012 9:16 PM Subject: [hp_agilent_equipment] Re: 608 output attenuator. Hi Max,
I'm not sure how this proves the attenuator is OK. If you use an oscilloscope with the option to select between a 50 ohm input and a 1M ohm input, the 50 ohm input will typically result in vertical deflection ~50% of the high impedance input.
The use of a 50 ohm passthrough adapter on a 1M ohm input, is a reasonable equivalent of selecting a 50 ohm input on the scope's vertical channel, at least until you reach a sufficiently high frequency so the passthrough adapter starts to display a reactance component.
If you have access to an antenna analyzer like an MFJ259B or MFJ269, then you can measure the VSWR of the 608 antenna output. I would say that is a reasonable test if you do not wish to remove the attenuator to physically inspect and measure the resistor(s).
Patrick Wong AK6C
--- In hp_agilent_equipment@..., "Max Robinson" <max@...> wrote:
...Today I checked it again the way I had calibrated it
with a short cable and a pass through 50 ohm termination at the scope end.
I set the frequency to 10 MHz and the attenuator to 100 mV to be sure there
would be no proximity effect between the pickup coil and the output tuned
circuit. With the scope reading 100 mV within accuracy spects I then
removed the termination and measured 200 mV within accuracy spects. From
this I conclude that my output attenuator has not been damaged by someone
transmitting into it.
------------------------------------
Yahoo! Groups Links
|
Re: 608 output attenuator.
Ah you were luckier than I. My Marconi TF1066/4 not only had a broken attenuator rack (from removing from cabinet without first turning it inward) but also a burned out 47 Ohm resistor at the probe.
It required complete removal of the probe assembly, including some gear work and springs and so on.
A lot of work but now the generator output is accurate and the attenuator works smoothly. The resistor is 1/4 Watt so it doesn't take much to burn it out. Maybe 5 Volts of rf for most of a minute. A 100 Watt transmitter delivers 71 Volts; that should do it in a second or less.
Bob
toggle quoted message
Show quoted text
--- On Tue, 12/25/12, Max Robinson <max@...> wrote: From: Max Robinson <max@...>
Subject: [hp_agilent_equipment] 608 output attenuator.
To: hp_agilent_equipment@...
Date: Tuesday, December 25, 2012, 10:52 AM
You may remember that I was concerned
about the integrity of the output
attenuator in my 608D.? Today I checked it again the
way I had calibrated it
with a short cable and a pass through 50 ohm termination at
the scope end.
I set the frequency to 10 MHz and the attenuator to 100 mV
to be sure there
would be no proximity effect between the pickup coil and the
output tuned
circuit.? With the scope reading 100 mV within accuracy
spects I then
removed the termination and measured 200 mV within accuracy
spects.? From
this I conclude that my output attenuator has not been
damaged by someone
transmitting into it.
Regards.
Max.? K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email
to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
To subscribe to the fun with wood group send a blank email
to
funwithwood-subscribe@...
------------------------------------
Yahoo! Groups Links
? ? hp_agilent_equipment-fullfeatured@...
|
Re: 3586A encoder question
The 3586, 8568, 8566, 8340 series units All used the RPG encoders with a lamp HP 2140-0016 (653 lamp ??). These RPG's were round flattened cylinders. if the lamps were old/darkened by age/misaligned you could get " works in one direction but not the other". The solution is to remove the RPG, pop the end cover-2 opposite tabs, use needle nose to pull the bulb from the side, check bulb for clarity, resistance-90 ohms, reinsert/replace with base of bulb flush with case of RPG, AND parallel to the optical grating inside - parallel to the PC brd. The detector diodes need to be illuminated equally.
Don B.
|
You may remember that I was concerned about the integrity of the output attenuator in my 608D. Today I checked it again the way I had calibrated it with a short cable and a pass through 50 ohm termination at the scope end. I set the frequency to 10 MHz and the attenuator to 100 mV to be sure there would be no proximity effect between the pickup coil and the output tuned circuit. With the scope reading 100 mV within accuracy spects I then removed the termination and measured 200 mV within accuracy spects. From this I conclude that my output attenuator has not been damaged by someone transmitting into it.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
|
I wanted to comment on this but it slipped my so called mind. For the gentleman who was having trouble with a 608 that was drifting and FM-ing I have some suggestions before getting into the RF cage. Check the two power supplies to be sure they are on voltage and free of ripple and other noise. A check with a scope is a must. Be sure the VR reference tube, V15 5651, is igniting. Also check the output from the modulator to be sure it is free of noise. That can most easily be found on the longest filter that comes out from the back near the top of the RF cage.
Getting into the RF cage I would replace the 6AB4 tube first. It is the buffer and is a UHF TV tube. I don't know about its lifetime but its cousin the 6AF4 was notorious for a short life. The output of my 608D was weak and replacing this tube brought it back without needing to replace the pencil triodes. Come to think of it I don't remember which model 608 you have. This may be a bum steer. However you can get the pencil triodes and the 6AB4 if you need it from Tube Depot
I have no affiliation with this company except to have bought tubes from them.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
toggle quoted message
Show quoted text
----- Original Message ----- From: "Glenn Little WB4UIV" <glennmaillist@...> To: <hp_agilent_equipment@...> Sent: Saturday, December 22, 2012 2:27 PM Subject: Re: [hp_agilent_equipment] Re: HP Oldies. All issues, 1 through 37, of "The Notebook" are archived here:
73
Glenn
WB4UIV
At 02:41 PM 12/22/2012, you wrote:
Hi All
I think I can help answer this:
At a hamfest last year, I picked up a complete collection of the
Boonton Radio Corp publication " The Notebook". This was a periodic
publication by Boonton covering products and applications of their
various products-- ( A great read BTW..Some day I will scan and post
them somewhere --BAMA ???)
On the last page of Issue 33, the editor admitted to being HP.
" Editors Note:
BRC assumes Divisional Status:
Boonton Radio Corporation, a subsidiary of the Hewlett-Packard
company since 1959, assumed divisional status November 1, 1962.
At that time, BRC's name was changed to Boonton Radio Company.
The conversion of BRC to a division of the Hewlett-Packard Co. is a
part of the over-all program to achieve greater flexibility of the
entire HP organization ......... "
It goes on to say that William Myers from HP - Palo Alto was named
General Manager of the new division.
Hope this helps....
Ray Johnson WB0EBG / KE3QY
HP Components group 1993-1996
++++++++++++++++++++============================
--- In hp_agilent_equipment@..., Dave Daniel <kc0wjn@...> wrote:
Really? I thought I've seen Boonton instruments younger than that. Did
HP keep the Boonton name for a while after the acquisition?
Dave
On 12/21/2012 2:12 PM, w0eom@... wrote:
1959. the instruments are shown in the HP 1963 catalog.
In a message dated 12/21/2012 12:22:30 P.M. Pacific Standard Time,
kc0wjn@... <mailto:kc0wjn%40gmail.com> writes:
Wow. I didn't know HP bought Boonton. I always liked Boonton
instruments, probably because I was born in Boonton. When did
HP buy them?
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
|
Re: S11 and S22 comparisons on 8753
On 25 December 2012 14:23, J. Forster <jfor@...> wrote: Dr. Joel is a great, helpful guy.
Merry Christmas all,
-John I agree with you John, in that Joel is very helpful. This help not only extends to someone owning the latest and greatest VNAs, but people like myself who own obsolete HP kit. His suggest to repair the thread, rather than pay a fortune to get the whole coupler replaced, saved me a lot of money. The US dealer I purchased this from offered to get it repaired, but that repair was changing the test port, not the whole coupler. I had concerns about that, as the tollerence in replacing just the test port is very stringent. IIRC, it has to be aligned to 0.0001". I would not trust anyone other than Agilent to do that job. Anyway, the VNA appears to work well now. I've been making measurement with it this morning - one way to spend Christmas day!! Dave.
|
Re: S11 and S22 comparisons on 8753
Am 25.12.2012 um 10:46 schrieb David Kirkby <david.kirkby@...>: I don't have quite $800k to blow this week after buying Christmas
presents. LOL.
No, me neither. It will have to wait until I get paid my next months
salary, which might be a few months as I'm unemployed at the minute!
Dave
I hope you find such a well paid job. In the unlikely event that you need an assistent I would work for you for a small fraction of it. I am an engineer (rf and communication) and graduated from TH Darmstadt 32 years ago. Merry Christmas Heinz
|
Re: S11 and S22 comparisons on 8753
Dr. Joel is a great, helpful guy.
Merry Christmas all,
-John
==============
toggle quoted message
Show quoted text
On 25 December 2012 03:17, Peter Gottlieb <hpnpilot@...> wrote:
And I'm sure the thing is completely unrepairable except by Agilent,
schematics
are not available, I suspect you are probably right about it being unrepairable except by
Agilent. I've not looked, but I doubt schematics are available now,
but perhaps they might be when is 20 years out of support.
once it goes out of support that is basically the end of that. Agilent will attempt to repair items that are out of support. I have
an HP 8720D VNA that has been out of support for quite some time, but
when I contacted Agilent about a repair a few months back, they said
they could probably fix it, and could give me an approximate cost.
They also offered to look at it free.
In my case, the fault was obvious - it was a damaged thread on the 3.5
mm test port. Lucily it was not on the thread used for the RF
measurement, but a secondly thread used to provide extra support to
the Agilent test port cables with the large NMD conectors. The test
port has both an internal and external thread. There's a picture of
the damage here:
Agilent intended replacing the whole coupler, which was going to cost
around ???3000 ($5000) with labour. However, Joel Dunsmore, the Agilent
VNA guru, said on that forum that one could try repairing the damaged
bit of thread with a Dremmel. In fact my friend repaired it for me
using a needle file at a cost to me of buying the needle files from
eBay of around ???5 ($8).
I don't have quite $800k to blow this week after buying Christmas
presents. LOL.
No, me neither. It will have to wait until I get paid my next months
salary, which might be a few months as I'm unemployed at the minute!
Dave
-John
Agilent sell a VNA for 110 GHz. At $691,437 for a 4-port model, I
don't expect Agilent sell too many of them! If you buy all the
options, it will be over $800,00.
Dave
|
Re: S11 and S22 comparisons on 8753
On 25 December 2012 03:17, Peter Gottlieb <hpnpilot@...> wrote: And I'm sure the thing is completely unrepairable except by Agilent, schematics
are not available, I suspect you are probably right about it being unrepairable except by Agilent. I've not looked, but I doubt schematics are available now, but perhaps they might be when is 20 years out of support. once it goes out of support that is basically the end of that. Agilent will attempt to repair items that are out of support. I have an HP 8720D VNA that has been out of support for quite some time, but when I contacted Agilent about a repair a few months back, they said they could probably fix it, and could give me an approximate cost. They also offered to look at it free. In my case, the fault was obvious - it was a damaged thread on the 3.5 mm test port. Lucily it was not on the thread used for the RF measurement, but a secondly thread used to provide extra support to the Agilent test port cables with the large NMD conectors. The test port has both an internal and external thread. There's a picture of the damage here: Agilent intended replacing the whole coupler, which was going to cost around ?3000 ($5000) with labour. However, Joel Dunsmore, the Agilent VNA guru, said on that forum that one could try repairing the damaged bit of thread with a Dremmel. In fact my friend repaired it for me using a needle file at a cost to me of buying the needle files from eBay of around ?5 ($8). I don't have quite $800k to blow this week after buying Christmas
presents. LOL.
No, me neither. It will have to wait until I get paid my next months salary, which might be a few months as I'm unemployed at the minute! Dave
-John
Agilent sell a VNA for 110 GHz. At $691,437 for a 4-port model, I
don't expect Agilent sell too many of them! If you buy all the
options, it will be over $800,00.
Dave
|
Re: S11 and S22 comparisons on 8753
Hi Dave:
I stand corrected, you can not measure phase angle with a SNA, but you can make a more accurate |S11| measurement with the SNA.
An air line is very different from a sliding load. If a sliding load is used as part of the VNA calibration the resulting measurement will be better than the common OSL type cal.
Note, VNA cal standards come with data, but the data is generic to the model number of the set, NOT to the serial number, hence you can call up cal standards in the CAL menu of the VNA.
There's a Wiltron (Anritsu) app note "Reflectometer Measurements - Revisited" (11410-00214) on using the air line and mismatched load to determine reflectometer directivity. From the app note:
"The effective directivity after a broadband load calibration is essentially equal to the return loss of the load used for calibration. Unless the user is certain that the return loss of the load is at least 15 dB greater than return loss of devices to be measured, significant errors can result. Sliding loads are recommended for calibration and VNA test port specifications are based upon sliding load calibrations."
So, if the desired impedance of the DUT is 50.0 +0j then using the airline measurement method with a SNA will give more accurate results.
--
Have Fun,
Brooke Clarke, N6GCE
|
Re: HP 3456a was Re: HP 3478A general questions
I hear what your saying about the ebay sales of used gear. Got the Fluke 8050a in today that I took a chance on. The seller claimed to have not tested it, yet took the time to photograph it with the power on and the display showing 0000. When I got it one of the batteries was at 0.00 volts and the entire front end was blown out. Once I replaced about 6 components in the front end and the batteries it's now up and running and appears well within it's rated specs or a little better. This time I lucked out, if it were a hybrid chip for example that was blown I would be looking at investing more to get a questionable piece of gear up and running..hoping that it would meet the specs it once did. This is all not to say I don't mind taking chances.
So with the 3457a how much weight does the Self Test Passed message hold ? I notice many sellers like to post that. I prefer the sellers that show something actually being measured.
Thanks, and happy holidays.
Jeff
toggle quoted message
Show quoted text
On 12/24/2012 1:03 PM, marvgozum wrote:
If both DMM meet your needs, then the chance it will work coming from unknowns via eBay, and easier to maintain DIY is your goal, the 3456a. If you need more updated features including amps but are willing to risk requiring a factory cal, repair and the costs it requires, 3457a.
3468a is not a system class DMM, but a general purpose DMM very much like he 3478a but is much cheaper as it doesn't support the GPIB bus but uses the then popular HP calculator interface. The 3479a is not a DMM, AFAIK.
--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, Jeff Machesky <jeff@...> wrote:Of the two meters, 3456 or 3457 which would be the smarter
purchase ?
In the interest of saving space I'm also looking at the HP 3468a or
3479a. I'm not seeing a major difference between the two except for
perhaps some lower ranges on the 3478a. Any helpful info regarding those
devices.
If I can score a 3456a or 3457a for a reasonable price then I'll be
heading that direction. At the moment I'm stuck doing projects with
4,000 count B&K meters and a 20,000 DMM on the Tek 2465 which is not in
cal to it's spec. So my purchases will be pretty soon. I have a Fluke
8010 on the way which I'm sure will also need cal.
Thanks,
|
