Help in identifying 5083-9025
Hello,
I'm hoping a list member can help. I have what looks like a new CRT tube in its original box. The HP part number is 5083-9025 and it has a rectangular face.
I had thought that it was for a 141 spectrum analyzer but I cannot find that part number used with a 141.
Can anyone tell me the original use for the 5083-9025 tube?
Thanks in advance.
Regards,
Norman
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Re: HP 11660A Shunt for HP 8556A
Hello Steve,
even using resistors of utmost precision you would neither obtain a 600 ohms input resistance (= load resistance for the TG) nor a 50 ohms output resistance (= source resistance for the 50 ohms load).
You may verify this fact by terminating the output into 50 ohms and measuring the resulting input resistance (which will be 575 ohms). Terminating the input into 600 ohms (= source resistance of the TG) will yield a source resistance of approx. 47.916666 ohms for the load.
Regards
Martin
|
Re: DIY: Repair of HP Step Attenuators
On 12/29/2012 12:51 AM, ffierling wrote:
The drive voltage is nominal under load.
Are you suggesting I compare the coil resistance to a known good
device? By what mechanism would the coil resistance increase - metal
fatigue?
Fred
bad connection(s) to the solenoid winding? --doug
|
Ron,
I did replace the backup cell, in fact one of the first things I did. I'll check the battery again and also make sure I didn't move the jumper to the test (disconnected) header pins while I was testing the unit
Thanks
Chuck
toggle quoted message
Show quoted text
On 12/29/2012 12:47 AM, Ron Wilkinson wrote: Hello Chuck,
That message is usually caused by the A2B1 3.6V Lithium backup cell on
the A2 CPU board needing replacement....
Regards.
Ron Wilkinson
mi-Biz Systems Pty Ltd
Perth - Western Australia
====
ChuckA wrote:
I've been restoring a 3562A analyzer for a couple of months I bought it
off ebay relatively cheap as it had some water damage. It's working
fairly well now, but I have a couple of startup errors, one I've tracked
down to the A4 LO board. When I replace with a known good board the LO
errors stop, but I keep getting a "Bad Auto Sequence Table" error on
startup and I can't find any reference to that error in the manuals I
have. Anyone familiar with this error and have an idea which board might
be the cause?
Thanks,
Chuck
-- See Early TV at: www.myvintagetv.com
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Re: DIY: Repair of HP Step Attenuators
The drive voltage is nominal under load.
Are you suggesting I compare the coil resistance to a known good device? By what mechanism would the coil resistance increase - metal fatigue?
Fred
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., Bob Albert <bob91343@...> wrote:
Measure the coil resistance and drive voltage.? It may be that the drive is weak and it's not getting enough coil current, either due to coil resistance increase or drive signal decrease.
Bob
--- On Fri, 12/28/12, ffierling <fff@...> wrote:
From: ffierling <fff@...>
Subject: [hp_agilent_equipment] Re: DIY: Repair of HP Step Attenuators
To: hp_agilent_equipment@...
Date: Friday, December 28, 2012, 2:56 PM
All,
I wonder: I have a sticky microwave relay in an HP 8593A. If the relay has been closed (ie for LOWBAND) for about five minutes and is opened, it won't close again unless it's had a chance to cool down (about 10 minutes at room temp). I can get it to close immediately with freeze-spray. Could this possibly be magnetization? Aside from a sticky relay pivot, how else can such relays fail?
Fred
--- In hp_agilent_equipment@..., "i5spo" <piero.soldi@> wrote:
maybe you have one cell stuck, due to magnetization of the small actuator... Can be locked to the ceiling of attenuator case.
------------------------------------
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|
Hello Chuck,
That message is usually caused by the A2B1 3.6V Lithium backup cell on the A2 CPU board needing replacement....
Regards.
Ron Wilkinson
mi-Biz Systems Pty Ltd
Perth - Western Australia
====
ChuckA wrote:
toggle quoted message
Show quoted text
I've been restoring a 3562A analyzer for a couple of months I bought it
off ebay relatively cheap as it had some water damage. It's working
fairly well now, but I have a couple of startup errors, one I've tracked
down to the A4 LO board. When I replace with a known good board the LO
errors stop, but I keep getting a "Bad Auto Sequence Table" error on
startup and I can't find any reference to that error in the manuals I
have. Anyone familiar with this error and have an idea which board might
be the cause?
Thanks,
Chuck
-- See Early TV at: www.myvintagetv.com
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I've been restoring a 3562A analyzer for a couple of months I bought it off ebay relatively cheap as it had some water damage. It's working fairly well now, but I have a couple of startup errors, one I've tracked down to the A4 LO board. When I replace with a known good board the LO errors stop, but I keep getting a "Bad Auto Sequence Table" error on startup and I can't find any reference to that error in the manuals I have. Anyone familiar with this error and have an idea which board might be the cause?
Thanks,
Chuck
-- See Early TV at: www.myvintagetv.com
|
Re: HP 8551 Spectrum Analyzer FS or trade?
In theory, but I have yet to find one with the YIG mod. Or, to be more accurate, most people selling them only have the main unit, or it and a display, but none of the cables or filter- they don't even know if it works, let alone what it's internal config is. I honestly don't have the room for another set.
-Dave
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Show quoted text
----- Original Message ----- From: "Dave Brown" <tractorb@...> To: "hp agilent equipment" <hp_agilent_equipment@...> Sent: Friday, December 28, 2012 1:18:20 PM Subject: Re: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade? Once the BWO has been replaced with the YIG upgrade kit thats no longer an issue- does this one have that upgrade applied? 73 Dave, ZL3FJ Christchurch, NZ ----- Original Message ----- From: < d.seiter@... > To: "hp agilent equipment" < hp_agilent_equipment@... > Sent: Saturday, December 29, 2012 8:13 AM Subject: Re: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade? Another problem with the 8551 (besides its' weight and therefore very high
shipping cost) it it's use of a BWO. They have a limited lifespan, and new
old stock are like hen's teeth. I got a nice one from the local estate
sale of a ham about three years ago, and it had multiple reminders on it
about not leaving it fully powered up for long periods of time. It also
can with three random BWOs and two HP sweepers that also use BWOs.
In talking with a few old timers I know from HP since then, the general
consensus was similar. They didn't worry about it at the time because they
could get new ones from Varian just down the road.
-Dave
----- Original Message -----
From: "Daniel Koller" < kaboomdk@... >
To: "hp agilent equipment" < hp_agilent_equipment@... >
Sent: Friday, December 28, 2012 6:44:17 AM
Subject: Re: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade?
Hi folks,
Is there really ZERO interest in an HP 8551 spectrum analyzer? Given that
I didn't even get any comments from this usually vocal group, and having
found some replies to older posts that went into my spam folder, I figured
I'd just ask again (copied below). Perhaps a few more people are back from
the holidays as well.
Please do let me know if the group consensus is that this thing is really
just a useless boat anchor even by vintage instrument standards.
Thanks and have a happy new year!
Dan
________________________________
From: kaboomdk < kaboomdk@... >
To: hp_agilent_equipment@...
Sent: Saturday, December 22, 2012 12:48 PM
Subject: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade?
Hello all,
I have an HP 8551 spectrum analyzer I would like to offer for sale or
trade. It works reasonably well, as I describe in more detail below, but I
am starting to upgrade my home shop with more "modern" equipment.
Cosmetically, the unit is clean, with some sticker residue on the display
units. It comes complete with all the necessary interconnecting cables and
the oval power cords. It weighs a TON. The RF unit alone is 90 lbs, so I
can't really ship it, even in parts. However, I live in Charlottesville,
VA, and I frequently travel up the north-east corridor, so if you live
anywhere between here and Burlington, VT, I am willing to deliver if you
can wait until March or so. Otherwise, perhaps we can make arrangements.
Some photos are posted here:
851_1.jpg A screen shot of the analyzer showing the FM band with a
dangling wire antenna and the input attenuator at 0 dB. Harmonic n=1. LO
signal on left.
851_2.jpg A 1 dBm, 2.4 GHz signal at the input with RF attenuation set to
30 dB. n=2.
851_3.jpg Same signal displayed on band 4, which uses the 200 MHz IF, n=1.
851_4.jpg The FM band again, displayed on the orange-screened 851B.
I would prefer not to part this instrument out, and to send all of it to a
good, loving home. Please make me an offer. I don't have a good feel for
price of this instrument particularly since shipping would normally be a
dominant part of the cost. Alternatively I am willing to trade for any of
the instruments below, in working or *repairable* condition. Of the
highest interest are any of the 141T SA plug-ins listed.
Any 8554/8555/8556 SA plug-ins for a 141T based spectrum analyzer,
preferably in grey paint.
182T mainframe
any 11664 A or B detectors
a 8755C swept amplitude analyzer
a sweeper covering ~MHz to ~2.5 GHz.
So, if interested, please contact me off-list and let's discuss. Thanks
and Happy Holidays!
Dan
851B/8551B Spectrum analyzer.
----------------------------
8551B: SN 625-00695 (RF unit)
851B: SN 526-00805 (Orange screen)
851B: SN 526-00339 (spare unit)
What works:
Mixer, at least at n=1, n=2 and n=3. I don't have sources to test higher
harmonics.
RF input attenuator
Stabilized fine tune - with some care
Trace centering is fine at or below 1 mc/cm, alowing one to quickly zoom
in on a signal.
Both 851B display units, with sharp and bright traces.
Fine and course tuning
Frequency vernier
What doesn't work:
Trace centering on the 3-300 MC/cm scales.
The signal jumps around when switching scales, though it can still be
tuned.
I can't follow the manual procedure in section 3-34 to set the spectrum
centering
adjustment on the front panel. The tracking meter does not respond as it
should.
As a result, LO scale pointer is ~100 MC off on scales at or below the 1
mc/cm sweep and
varies on the 3-300 mc/cm scales.
May need to reglue the scale drum at some point, but it's ok for now
The orange plastic filter in one of the 851s has cracks in it in the lower
left corner just off scale.
The tune knob had it's handle broken off, but I kept the original parts
and was able to
epoxy together a decent looking reconstruction, so it works now and looks
ok.
I can't figure out if the signal identifier works. It's supposed to shift
the signal by n cm at 100 KC/cm,
which it does, but when you press the "reference" knob, it should revert
to the n=1 state.
But instead the trace keeps moving off screen. I suspect this is related
to the issues at large spans.
What you get:
A functional piece of history - the first calibrated spectrum analyzer
from HP.
A basic, working spectrum analyzer
All interconnecting cables and oval power cords
One ORIGINAL PAPER MANUAL for the 851B display section
A spare 851B display unit (the orange one was originally paired with the
8551, judging from the stickers)
Satisfaction of working with a wonderful instrument
Herniated disks
What you don't get:
Any of the sources shown in the pictures
The instrument rack, though that can be negotiated separately
The 50 Ohm terminator on the back at the LO output. I only have a few of
these and I need them,
however it seems to work ok without it at the few frequencies I looked at.
Paper manuals for the 8551B section - but these are available on-line.
The right to return the instrument
Medical insurance
------------------------------------
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Re: HP-IB / GPIB Printer Emulator
I found a distributor web site in Germany that shows the product:
I also remember that it did a good job, except that it didn't know what to do with the "zero" character on the 8566 and 8568 spectrum analyzers.
Vladan
|
Re: HP-IB / GPIB Printer Emulator
Martin,
Before I found 7470.exe, I used to print to a laser printer with a standard parallel port. I used an adapter made by a company called "Intelligent Interfaces". I think it was called Microplot 50 or Microplot 45. It takes GPIB from the instrument and puts out some version of PCL for the printer.
I see they have a web site, but on my browser it comes up as a blank page.
Vladan
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "martin_u_fischer" <martin.u.fischer@...> wrote: ... Would anybody know a free software solution for capturing (PCL) print data
via HP-IB and a HP-IB/USB adapter to a PC for storing them into a graphic file,
a print file or outputting them on an attached printer (e. g. LaserJet)?...
Martin
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I've added some pictures under "3561A repair" to document a problem with my SA. All the electronics check out after replacing some parts but some of the buttons and most of the LEDs were not working on the front panel. After opening the front panel I found that this conductive foam seems to be the culprit. I've repaired LCD displays by cleaning conductive foam but the conductors in this foam seem very small. I cleaned it up with some ISO-alcohol and some of the LEDs started working but some of the key pads quit working. I cleaned it a second time and the same results. Some other buttons are working but some still not. The LED problem is solely the problem of the conductive foam but the keys could also be the conductive pads on the rubber keys. I've measured the resistance on most of the pads and they are about 50 ohms except for some that are 200 ohms and greater (up to about 480 ohms). I'm not sure what the max resistance can be and still make the key function. My solution first is to just solder the two boards with a connection harness to eliminate the conductive foam but I'm not sure how to fix the rubber key problem. I have some conductive paint but the resistance is still high, around 150 ohms. Does anyone have any success repairing this kind of problem?
Gary
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On 29 December 2012 03:39, Jeff Machesky <jeff@...> wrote: So I have a 3457a on the way that passes the self tests. What are the
odds of it actually working when I get it? What should I look for as a
general failure for these devices? I always assume anything I purchase
off ebay is going to be in need of repair. Hopefully I'm wrong this
time, but I have to say I've never purchased used gear that didn't need
some repair. The device is in good cosmetic condition and the seller
showed that it passed self tests. No actually readings however. It
was last calibrated in 98. Ohh and my apologizes to anyone that was
also bidding on the same unit. There was a few.
Thanks in advance, I had one, and it was a good meter. I sold it to a friend, who has never used it, and now I need it, so he is going to sell it back to me. Neither of us can remember what I charged him for it first time around. I did write some software to control that meter. It's only been tested on Solaris with the NI GPIB card, but being command line driven, it should be fairly portable. But I suspect there are much nicer interfaces. I looked up the price the other day to get Agilent to calibrate it. The cost was about ?126 (around $200 I guess). Which is quite reasonable. That price included delivery and collection costs, but not tax. I never had any problems with mine, and when my mate and I were discussing me having it back yesteday or the day before, he done a few quick checks and confirmed it still worked fine. You seem to get quit a lot of meter for your money on that. The 3458A which gives an extra digit costs about 10x as much used. There is a newer Agilent meter than the 3457A, which tends to fetch more, but I recall at one time noticing the calibration cost on that was very most (?40 or so). Dave
|
Re: DIY: Repair of HP Step Attenuators
Measure the coil resistance and drive voltage.? It may be that the drive is weak and it's not getting enough coil current, either due to coil resistance increase or drive signal decrease.
Bob
toggle quoted message
Show quoted text
--- On Fri, 12/28/12, ffierling <fff@...> wrote: From: ffierling <fff@...> Subject: [hp_agilent_equipment] Re: DIY: Repair of HP Step Attenuators To: hp_agilent_equipment@... Date: Friday, December 28, 2012, 2:56 PM All, I wonder: I have a sticky microwave relay in an HP 8593A. If the relay has been closed (ie for LOWBAND) for about five minutes and is opened, it won't close again unless it's had a chance to cool down (about 10 minutes at room temp). I can get it to close immediately with freeze-spray. Could this possibly be magnetization? Aside from a sticky relay pivot, how else can such relays fail? Fred --- In hp_agilent_equipment@..., "i5spo" <piero.soldi@...> wrote: maybe you have one cell stuck, due to magnetization of the small actuator... Can be locked to the ceiling of attenuator case. ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed]
|
Re: New Spectrum Analyzer Discussion
I think maybe you misunderstood my posting. Or I didn't write it well.
I mentioned I have an HP and an avcom but they are not what I am discussing in my posting.
The spectrum analyzer I am talking about is:
RF Explorer
it is about $250 and covers 15mhz to 2.7ghz.
It is pocket size and has a built in display screen and can be connected to a PC for large screen display and captures of screen shots.
Sorry if I wasn't clear in my first posting.
You can find details by googling RF Explorer.
Thank you,
Ken
toggle quoted message
Show quoted text
--- On Fri, 12/28/12, David Kirkby <david.kirkby@...> wrote: From: David Kirkby <david.kirkby@...> Subject: Re: [hp_agilent_equipment] New Spectrum Analyzer Discussion To: hp_agilent_equipment@... Date: Friday, December 28, 2012, 10:18 PM The prices I see at: make this an expensive spectrum analyer. You were lucky to get one for $250, if the basic price is $3375 I think I'd rather keep my HP 70000 series spectrum analyzer, though portable it is certainly not. Some of the prices are below. AVCOM Model # ??? Description ??? Cost $US PSA-65C System??? PSA-65C??? Portable Spectrum Analyzer ??? 3,375.00 PSA65Coption??? FM Demodulator ??? 215.00 PSA65Coption??? 10 kHz Resolution Bandwidth ??? 325.00 PSA65Coption??? AM Detector ??? 137.50 PSA65Coption??? Oscilloscope Interface ??? 210.00 ??? ??? PSA-65C Accessories??? PSA65Cacces??? Freq. Extender 1250 - 2500 MHz ??? 650.00 PSA65Cacces??? Freq. Extender 2500 - 3750 MHz ??? 650.00 PSA65Cacces??? Freq. Extender 1250 - 3750 MHz Combo ??? 1,300.00 PSA65Cacces??? Freq. Extender 3750 - 4200 MHz ??? 650.00 PSA65Cacces??? Freq. Extender 1 GHz - 2 GHz ??? 650.00 PSA65Cacces??? Freq. Extender 2 GHz - 3 GHz ??? 650.00 PSA65Cacces??? Freq. Extender 3.7GHz-4.2GHz ??? 650.00 ??? ??? Dave On 29 December 2012 02:44, disklog <disklog@...> wrote: Avcom PSA65C ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed]
|
So I have a 3457a on the way that passes the self tests. What are the odds of it actually working when I get it? What should I look for as a general failure for these devices? I always assume anything I purchase off ebay is going to be in need of repair. Hopefully I'm wrong this time, but I have to say I've never purchased used gear that didn't need some repair. The device is in good cosmetic condition and the seller showed that it passed self tests. No actually readings however. It was last calibrated in 98. Ohh and my apologizes to anyone that was also bidding on the same unit. There was a few.
Thanks in advance,
Jeff
|
Re: New Spectrum Analyzer Discussion
The prices I see at:
make this an expensive spectrum analyer. You were lucky to get one for
$250, if the basic price is $3375
I think I'd rather keep my HP 70000 series spectrum analyzer, though
portable it is certainly not.
Some of the prices are below.
AVCOM Model # Description Cost $US
PSA-65C System
PSA-65C Portable Spectrum Analyzer 3,375.00
PSA65Coption FM Demodulator 215.00
PSA65Coption 10 kHz Resolution Bandwidth 325.00
PSA65Coption AM Detector 137.50
PSA65Coption Oscilloscope Interface 210.00
PSA-65C Accessories
PSA65Cacces Freq. Extender 1250 - 2500 MHz 650.00
PSA65Cacces Freq. Extender 2500 - 3750 MHz 650.00
PSA65Cacces Freq. Extender 1250 - 3750 MHz Combo 1,300.00
PSA65Cacces Freq. Extender 3750 - 4200 MHz 650.00
PSA65Cacces Freq. Extender 1 GHz - 2 GHz 650.00
PSA65Cacces Freq. Extender 2 GHz - 3 GHz 650.00
PSA65Cacces Freq. Extender 3.7GHz-4.2GHz 650.00
Dave
toggle quoted message
Show quoted text
On 29 December 2012 02:44, disklog <disklog@...> wrote: Avcom PSA65C
|
New Spectrum Analyzer Discussion
I see there is some discussion about an older large spectrum analyzer. I thought I would share my experience with a new very cheap but quite useful spectrum analyzer.
I have an HP 8558B and an Avcom PSA65C but I find myself using most often an analyzer I picked up recently for less than $250.00.
It is a pocket spectrum analyzer called the RF Explorer. Google it for details.
It covers 15mhz to 2.7ghz, has a built in screen, and also connects to a PC for large screen display and captures.
I have no relation to the people that sell it, I just think it is a valuable useful analyzer for field measurements, and want to let others know of its availability. I never see it discussed anywhere nor is it advertised.
Hope this posting helps you all with your projects and needs.
Thanks, Ken
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Dave et all
These manuals are all for the "mixed technology" ( Tubes + Transistors) version of the 410C
The all solid state version started at serial number 0982A22339. The Manual Lee needs is 00410-90009
Dave
ArtekManuals.com
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On 12/28/2012 12:10 PM, Dave Daniel wrote: These look better:
(Military version)
from the same web site.
Dave
On 12/28/2012 10:26 AM, Steve Vineyard wrote:
Try here:
www.hparchive.com/*Manuals*/*HP*-*410C*-*Manual*.pdf
Steve
vk5abc wrote:
Hello All
Does anyone have a manual for the last version of the 410c meter solid
state version.
Lee.
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Yahoo! Groups Links
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Yahoo! Groups Links
--
Dave Henderson
Manuals@...
www.Artekmanuals.com
PO Box 175
Welch,MN 55089
651-269-4265
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Re: HP 8551 Spectrum Analyzer FS or trade?
On Fri, 28 Dec 2012 06:44:17 -0800 (PST), you wrote: Hi folks,
??? ???Is there really ZERO interest in an HP 8551 spectrum analyzer? ???Given that I didn't even get any comments from this usually vocal group, and having found some replies to older posts that went into my spam folder, I figured I'd just ask again (copied below). ???Perhaps a few more people are back from the holidays as well. ??? I'm one who works with the dark side of the Force, that is, digital. I have no spectrum analyzers at all, although it might be nice to get one one day (and I am sufficiently space limited to not want a 3 or 4 foot 19 inch rack that has it's own 5HP gasoline motor just to move it around....) However, I *may* represent a population of people who would fairly automatically say.... "not right now, don't need one, too large, and I don't have enough space." Now if someone had a really unreasonably cheap one for a Tektronix 7000 series scope, then I'd be interested. For those of you who don't know, unreasonably cheap is about 25 dollars.... I'm not holding my breath.... Harvey
??? Please do let me know if the group???consensus???is that this thing is really just a useless boat anchor even by vintage instrument standards. ???
???Thanks and have a happy new year!
??? Dan
________________________________
From: kaboomdk <kaboomdk@...>
To: hp_agilent_equipment@...
Sent: Saturday, December 22, 2012 12:48 PM
Subject: [hp_agilent_equipment] HP 8551 Spectrum Analyzer FS or trade?
???
Hello all,
I have an HP 8551 spectrum analyzer I would like to offer for sale or trade. It works reasonably well, as I describe in more detail below, but I am starting to upgrade my home shop with more "modern" equipment.
Cosmetically, the unit is clean, with some sticker residue on the display units. It comes complete with all the necessary interconnecting cables and the oval power cords. It weighs a TON. The RF unit alone is 90 lbs, so I can't really ship it, even in parts. However, I live in Charlottesville, VA, and I frequently travel up the north-east corridor, so if you live anywhere between here and Burlington, VT, I am willing to deliver if you can wait until March or so. Otherwise, perhaps we can make arrangements.
Some photos are posted here:
851_1.jpg A screen shot of the analyzer showing the FM band with a dangling wire antenna and the input attenuator at 0 dB. Harmonic n=1. LO signal on left.
851_2.jpg A 1 dBm, 2.4 GHz signal at the input with RF attenuation set to 30 dB. n=2.
851_3.jpg Same signal displayed on band 4, which uses the 200 MHz IF, n=1.
851_4.jpg The FM band again, displayed on the orange-screened 851B.
I would prefer not to part this instrument out, and to send all of it to a good, loving home. Please make me an offer. I don't have a good feel for price of this instrument particularly since shipping would normally be a dominant part of the cost. Alternatively I am willing to trade for any of the instruments below, in working or *repairable* condition. Of the highest interest are any of the 141T SA plug-ins listed.
Any 8554/8555/8556 SA plug-ins for a 141T based spectrum analyzer, preferably in grey paint.
182T mainframe
any 11664 A or B detectors
a 8755C swept amplitude analyzer
a sweeper covering ~MHz to ~2.5 GHz.
So, if interested, please contact me off-list and let's discuss. Thanks and Happy Holidays!
Dan
851B/8551B Spectrum analyzer.
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8551B: SN 625-00695 (RF unit)
851B: SN 526-00805 (Orange screen)
851B: SN 526-00339 (spare unit)
What works:
Mixer, at least at n=1, n=2 and n=3. I don't have sources to test higher harmonics.
RF input attenuator
Stabilized fine tune - with some care
Trace centering is fine at or below 1 mc/cm, alowing one to quickly zoom in on a signal.
Both 851B display units, with sharp and bright traces.
Fine and course tuning
Frequency vernier
What doesn't work:
Trace centering on the 3-300 MC/cm scales.
The signal jumps around when switching scales, though it can still be tuned.
I can't follow the manual procedure in section 3-34 to set the spectrum centering
adjustment on the front panel. The tracking meter does not respond as it should.
As a result, LO scale pointer is ~100 MC off on scales at or below the 1 mc/cm sweep and
varies on the 3-300 mc/cm scales.
May need to reglue the scale drum at some point, but it's ok for now
The orange plastic filter in one of the 851s has cracks in it in the lower left corner just off scale.
The tune knob had it's handle broken off, but I kept the original parts and was able to
epoxy together a decent looking reconstruction, so it works now and looks ok.
I can't figure out if the signal identifier works. It's supposed to shift the signal by n cm at 100 KC/cm,
which it does, but when you press the "reference" knob, it should revert to the n=1 state.
But instead the trace keeps moving off screen. I suspect this is related to the issues at large spans.
What you get:
A functional piece of history - the first calibrated spectrum analyzer from HP.
A basic, working spectrum analyzer
All interconnecting cables and oval power cords
One ORIGINAL PAPER MANUAL for the 851B display section
A spare 851B display unit (the orange one was originally paired with the 8551, judging from the stickers)
Satisfaction of working with a wonderful instrument
Herniated disks
What you don't get:
Any of the sources shown in the pictures
The instrument rack, though that can be negotiated separately
The 50 Ohm terminator on the back at the LO output. I only have a few of these and I need them,
however it seems to work ok without it at the few frequencies I looked at.
Paper manuals for the 8551B section - but these are available on-line.
The right to return the instrument
Medical insurance
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Re: DIY: Repair of HP Step Attenuators
All,
I wonder: I have a sticky microwave relay in an HP 8593A. If the relay has been closed (ie for LOWBAND) for about five minutes and is opened, it won't close again unless it's had a chance to cool down (about 10 minutes at room temp). I can get it to close immediately with freeze-spray. Could this possibly be magnetization? Aside from a sticky relay pivot, how else can such relays fail?
Fred
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--- In hp_agilent_equipment@..., "i5spo" <piero.soldi@...> wrote: maybe you have one cell stuck, due to magnetization of the small actuator... Can be locked to the ceiling of attenuator case.
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