I broke and rebuilt a HP 3325A function generator. It appears that everything works up to the power amp. Power amp has had most transistors replaced and does give out an appropriate signal as far as amplitude. The wave forms are OK at the test point prior to the final. The output sine waveform from final is distorted and of course square is distorted at higher freq. I was planning to replace the power amp input dual transistor 1845-0357 (SD2608).I think it's selenium 360mW NPN. I cannot find SD2608 or a cross to it. There is an original 1854-0357 on E Pay. Does anyone know what this crosses to? Do you think this could be the problem? Any other suggestions as to aligning the final amp? Any particulars as to the replacement of transistors? Wally KC9INK
|
Re: Attenuators in HP/Agilent Infinium 548xx scopes
Hi Pete,
The 54810A, 815A, 820A, and 825A use the same attenuators. They are also the same as the older 5452XA and 5454XA scopes. All of the above scopes also share the same A/D converters.
The 54835A and 54845A use different ones. They are dual units and there's two in each scope. Very un-repairable IME. There's a few on Ebay now for $500.
Jay
|
Re: HP 8559 / 853A How to peak hold and normalize display??
Thank you Vladan, I got that manual and it helped a lot. I'll give it a try tomorrow.
Regards, Lenny Wintfeld (ham radio call: W2BVH)
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----- Original Message -----
From: pianovt@... [hp_agilent_equipment] <hp_agilent_equipment@...>
To: hp agilent equipment <hp_agilent_equipment@...>
Sent: Wed, 14 Oct 2015 22:58:08 -0000 (UTC)
Subject: [hp_agilent_equipment] Re: HP 8559 / 853A How to peak hold and normalize display??
Lenny,
The 853 storage, if I remember correctly, was based on the HP 8750A Storage Normalizer. The buttons have different names, but the concept is similar. You may find some useful instructions in the HP 8750 manual which you can find on the web.
Vladan
|
Re: HP 8559 / 853A How to peak hold and normalize display??
How "high" is the level? Depending on the bandwidth and power level, you may want to avoid this method on some devices. Passive devices and amplifiers through VHF should be no problem. In the microwave range, some amplifiers can be damaged by noise testing - they can't handle the peak voltages, even though the average power may be quite small.
The fastest, tiniest devices are most at risk because they can only take
so much peak energy, regardless of the power spectrum. To get high
average power in broadband noise signals, large voltage excursions are
needed. You can see the envelope of these in the time domain, and
consider what effect the peak voltage may have on the DUT and the measuring equipment. If the peaks are equivalent to less than the peak CW voltage that the device can handle, then it should be no problem.
Also consider the same regarding the SA input capability. This is aggravated by the low test signal power spectral density - in order to see the fairly small resulting power levels, the front-end needs to be set to higher sensitivity ranges, so the front step attenuator that usually protects somewhat against typical RF CW levels may be set to minimal attenuation. It's good practice to keep at least 10 dB attenuation up front, but it's easy to forget during operation, exposing the mixer to possible damage.
If the SA goes to microwave ranges, but the required DUT and noise bandwidth are much smaller, say audio up to VHF, I'd recommend adding a diode-clamp type limiter to protect the SA input, just in case. Then you won't have to worry about the peaks, and can try to get as much noise source power as possible - you'll want all you can get to provide reasonable test levels.
For lower frequency SAs and such with high impedance input, there's usually plenty of input protection, so noise testing should be no problem.
Ed
|
Re: HP 8559 / 853A How to peak hold and normalize display??
Lenny,
The 853 storage, if I remember correctly, was based on the HP 8750A Storage Normalizer. The buttons have different names, but the concept is similar. You may find some useful instructions in the HP 8750 manual which you can find on the web.
Vladan
|
Re: HP 8559 / 853A How to peak hold and normalize display??
I suspect the 853A cannot subtract two STORED Traces. I think one of them will have to be Live. If your using Noise as your Signal, then you will need to use Noise Averaging, which the 853A will do. This will mean you will have two Noise Averaged Traces to Store before Subtraction. I don¡¯t think the 853A can do that. If you can extract these to a Computer, then the Computer can do the final math. This all pre-supposes that the 8559A is a good enough Spectrum Analyzer, which I doubt. It depends on what kind of accuracy you¡¯re looking for. Rgds Bill Lauchlan ?
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From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Wednesday, October 14, 2015 6:03 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] HP 8559 / 853A How to peak hold and normalize display??? ?
It is a fairly routine measurement to make, but it's usually done with
a network analyzer. It needn't be done with a VNA if you just want
frequency response (a scalar quantity...amplitude, no phase), a scalar
network analyzer will do the trick. One typically calibrates out test
fixtures and cables, but source leveling is usually done by the sweep
generator in a "set it and forget it" sort of way.
That said, I'm pretty sure the 853 frame can do stored trace
subtraction, but it's been so long since I've seen one I don't recall
exactly how. :-(
-Dave
On 10/14/2015 02:57 PM, w2bvh w2bvh@... [hp_agilent_equipment]
wrote:
> I would like to use a high level noise source (one of those $15 Chinese
> boards) with a HP8559/853 to do filter and amplifier passband / stopband
> measurements. I know that in general I have store the noise source's
> output and then subtract the filter (or amplifier) output in order to
> normalize the measurement against the non-constant noise source output.
>
> I'm sure this must be a relatively routine measurement technique, but I
> don't know what buttons to press in what order on the 853A display unit
> to do this. The manual is pretty ambiguous about how to use the "A" and
> "B" "Trace" buttons.
>
> Could someone who does this routinely explain which buttons to press
> when? And maybe, more clearly, what each of them does?
>
> Thanks in advance for any help.
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: 83623B Synthesized Sweeper: notch at around 90MHz and unleveled directly above this notch
Hello Joe,
I wanted to get back to you regarding your offering to help here. Do you have an idea how the nominal frequency of the 5.4GHz VCO is adjusted, so that the loop will lock again in the right 100MHz Raster? Is it one of the trimpots or is it probably done by software, a calibration constant, which influences a DAC value and its output voltage on the RF Interface Board A20, which is then passed on to the Low Band Bias Board inside of the Low Band Assembly A24?
The Low Band Bias Board Revision of the blank PCB 5063-1601 is Rev. A, Datecode 3522.
This board revision has six trimpots and one trim cap. As I saw from the pictures from another member in this group, there must be at least who different revisions of this board.
I could surely reverse engineer the Low Band Bias Board as soon as I have the time to do so, but maybe you can save me that time if you can give me the required information. I now have a counter capable of measuring the 5.4GHz oscillator frequency in order to monitor the alignment.
It woulf be great if you could help me here.
Thanks and best regards,
Thomas
|
Re: HP 8559 / 853A How to peak hold and normalize display??
It is a fairly routine measurement to make, but it's usually done with a network analyzer. It needn't be done with a VNA if you just want frequency response (a scalar quantity...amplitude, no phase), a scalar network analyzer will do the trick. One typically calibrates out test fixtures and cables, but source leveling is usually done by the sweep generator in a "set it and forget it" sort of way. That said, I'm pretty sure the 853 frame can do stored trace subtraction, but it's been so long since I've seen one I don't recall exactly how. :-( -Dave On 10/14/2015 02:57 PM, w2bvh w2bvh@... [hp_agilent_equipment] wrote: I would like to use a high level noise source (one of those $15 Chinese
boards) with a HP8559/853 to do filter and amplifier passband / stopband
measurements. I know that in general I have store the noise source's
output and then subtract the filter (or amplifier) output in order to
normalize the measurement against the non-constant noise source output.
I'm sure this must be a relatively routine measurement technique, but I
don't know what buttons to press in what order on the 853A display unit
to do this. The manual is pretty ambiguous about how to use the "A" and
"B" "Trace" buttons.
Could someone who does this routinely explain which buttons to press
when? And maybe, more clearly, what each of them does?
Thanks in advance for any help. -- Dave McGuire, AK4HZ New Kensington, PA
|
--------------------------------------------
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On Thu, 15/10/15, wb4yvo@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
Subject: Re: [hp_agilent_equipment] Hp 141T
To: hp_agilent_equipment@...
Received: Thursday, 15 October, 2015, 2:29 AM
?
No I havent checked anything yet..Please send a
email to me and I can send pictures ?Maybe that will help
better..
Skip..
?Wb4yvo@...
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HP 8559 / 853A How to peak hold and normalize display??
I would like to use a high level noise source (one of those $15 Chinese boards) with a HP8559/853 to do filter and amplifier passband / stopband measurements. I know that in general I have store the noise source's output and then subtract the filter (or amplifier) output in order to normalize the measurement against the non-constant noise source output.
I'm sure this must be a relatively routine measurement technique, but I don't know what buttons to press in what order on the 853A display unit to do this. The manual is pretty ambiguous about how to use the "A" and "B" "Trace" buttons.
Could someone who does this routinely explain which buttons to press when? And maybe, more clearly, what each of them does?
Thanks in advance for any help.
Lenny Wintfeld
|
Attenuators in HP/Agilent Infinium 548xx scopes
Hello. Does anybody know if the attenuator modules are shared across the various 548xx scope models? I have a 54845 which I think has at least one bad unit. Can I salvage attenuators from, for example, a 54825?
Thanks.
-Pete
|
No I havent checked anything yet..Please send a email to me and I can send pictures ?Maybe that will help better..
Skip.. ?Wb4yvo@...
|
Group
I am asking for a bit of help or advice on a task I have taken on.
Fred, my former customer and associate,? passed away several years ago
and his widow has asked me to help sell his test equipment.
The small generic equipment I have been selling on ebay.
The HP and Tek gear I would like to offer on reflectors first.
We need and would sincerely appreciate any help on what a fair asking price
would be for the equipment and also if there is any item of interest to you
please contact me off list and I will attempt to test it and send
pictures.
This equipment is above average in appearance and comes from tobacco free
home maintained by a gentle and caring individual.
All items will be professionally packed and shipped to arrive alive WITH a
full refund if you are not satisfied with your purchase
HP items
8111A? function generator
3456A voltmeter
5401A scope
34970A data acquisition unit with two GPIB cables
Thank-you for your assistance and allowing me to post these items
here
Paul K0UYA
|
Have you checked the power supplies for excessive ripple?
On 2015-Oct-14 9:46 AM, 'Skip Masker'
wb4yvo@... [hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
I have a HP-141T that was working
correctly but now has a problem with the scan???? instead of a
smooth trace its in humps.??? Hard to explain.??? I can take
pictures of trace..
???
Anyone with any ideas can contact
me???at??? wb4yvo@...???
then I can send pictures to describe symptoms much better..
???
???
Thanks
Skip...???
|
I have a HP-141T that was working correctly but now
has a problem with the scan?? instead of a smooth trace its in humps.?
Hard to explain.? I can take pictures of trace..
?
Anyone with any ideas can contact me?at?
wb4yvo@...? then I can send
pictures to describe symptoms much better..
?
?
Thanks
Skip...?
|
Re: HP1651B Boot and other Disks needed
Hello all,
Sam's original message prompted me to review my situation since I have a 1650B that I'd 'stolen' the power supply from in order to fix a 54510A 'scope.
I now have forty-odd 720K disks and a second working 1650B; at least working as far as duplicating disks and passing its self tests is concerned.? I also revived a PC that has a 3.5" floppy drive.? Not fun... dead CMOS RAM, one dead hard drive and one with a critical bad sector.? A CR2032 fixes the CMOS RAM problem, one hard drive has not recovered and the other is working after installing a new OS; I doubt that it will last very long.
I can now create LIF disks in one of two ways:
1. Duplicate them on the 1650B subject to whatever the V2.11 system disk can handle. 2. Create them on the PC as long as LIFUTIL.EXE can format and write the disk*.
A disk created from the V2.11 files downloaded from the Keysight site and created using LIFUTIL.EXE (copying files individually) works on the 1650B. ?(I've yet to try letting LIFUTIL.EXE copy an entire directory to the floppy.)
Since I had to buy the 720K disks and USPS don't ship for free, I'll offer 165XB System disks for $5 a pair shipped USPS** (one duplicated on the 1650B, one created on the PC; you have a better chance of one working that way).
I'll work with anyone else wanting disks for another instrument if you can supply the DOS format files and instructions how to use LIFUTIL.EXE to create the disk. ?(It's probably best not to be sending working disks around if you can duplicate your own.)
Orin.
*and as long as LIFUTIL.EXE can read the required files from a CDROM... I burn LIFUTIL.EXE and the required files to a CD and boot an MSDOS 6.22 disk with CDROM support.? The BIOS/MSDOS on this aging machine cooperate in this respect.? There are only two CD coasters in the trash can resulting from this experiment so far.
**48 contiguous states, $5 plus shipping cost elsewhere as I don't have a clue as to the postal rates elsewhere.? I do figure I can ship a couple of disks to the 48 contiguous states for $5 without losing money...
?
Hello Sam, Group,
Regarding failure to use Lifutil.exe on "DOS" machine: When downloading "1650_51B_V2.11_OS_SYS.zip" from HP-A-K website you get the LIF Utilities A.00.00, known to be quite fussy (to not say unusable) for machines it runs on. See end of document for details: ftp://ftp.hpmuseum.org/lif/lifutil/lif_over.txtYou can find LIF Utilities A.00.03 in the self extracting "Lifarc.exe" by searching for "LIFUTIL" on HP-A-K website. HTH, Paul
|
Re: HP1651B Boot and other Disks needed
Sam,
Did you get your boot disk?
I had an operational 1650B, but I'd stolen it's power supply for a 54510A 'scope.? Your message prompted me to 'correct' the situation. I now have a PC capable of producing LIF disks and a second 1650B.
I can now make 165XB System Disks (V2.11) both on the 1650B and on a PC.
If you like, I could send you a couple of disks, one made on the 1650B and one made on a PC.? Both boot on my 1650B.
Orin.
On Sun, Oct 4, 2015 at 11:04 AM, sam.reaves@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
?
Hello,
I picked up an otherwise operational HP1651B but I need the Boot disks for it.
Does anyone have any of these disks or can make one (or a few) for me?
Thank you,
Sam
W3OHM
Moderator LeCroy_Owners_Group
|
Anyone have any experience with Sell It Easy?
I saw an article about this and was wondering if we're seeing a new competitor to ebay:
Just beginning so not in all cities for full service, but interesting!
|
Hi,
Thanks for the tip! ?Yes I did check with Sphere. ?The CRTs are not in their list. ?So I sent them a message to see if they had any info.
Thanks again for your help.
73
Ray VE3FN
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Did you check here? ? ? ?Gang,
I have found a couple of NOS HP CRTs and I can find very little info on them. I suspect they are from old oscilloscopes. They are 5083-5072 and HAR 81149. Does anyone know what equipment used them?
Thanks!
Ray Perrin VE3FN
|
Re: Comment on the UGSimple USB to GPIB adapter
Greetings,
Be careful with this unit. This is the "Simple" version of a more expensive one. I believe this one does not support the GPIB Trigger command, to name only this one. Only reads and writes are possible. This makes it much less appealing. The instrument will only trigger a read at its rate, not at your rate.
Cheers,
Bert, VE2ZAZ
|
Dave McGuire
Skip
ve2zaz