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Re: HP-182C repair
Hi Ken,
thanks for the answer, my findings after your test follow On 9/26/09, ken chalfant <kpchalfant@...> wrote: Greetings Frank,for now, no plugins installed, until at least I can see something on the CRT. The other mainframe shows a spot even with no plugins if I set to ext display. right, it's not storage. nothing happens. nothing seen, with no plugins I have only the horizontal knob anyway. no, and probably it's not an off screen dot since I can see it only when turning the scale illumination knob, not the intensity. However if I have the intensity up and I power on the mainframe I see a fast spot moving and disappearing in less than one second. Maybe a problem on the intensity circuitry? I hope so :-) thanks a lot and best regards Frank
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Re: HP-182C repair
Greetings Frank,
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Please advise as to the plug-ins you have in the main frame. I can't remember for certain - the 182C is not storage - correct? What happens when you depress the "BEAM FINDER"? What happens when you depress the "BEAM FINDER" and move both the X and Y position knobs? Please turn the intensity up to very bright - just once - and power the unit OFF. Does the off screen dot move toward the center of the CRT before it fades away? Let's see if we can figure out why it does not want to behave. Warm regards, Ken ----- Original Message -----
From: francesco messineo<mailto:francesco.messineo@...> To: hp_agilent_equipment<mailto:hp_agilent_equipment@...> Sent: Friday, September 25, 2009 2:55 PM Subject: [hp_agilent_equipment] HP-182C repair Hello all, I'm trying to revive a 182C oscilloscope. I have the service manual, but it's for a different serial group. I think it should be enough close anyway. So far I've checked and set all low voltages and the cathode voltage. Then I tried to set the intensity limit but there's no visible spot on the CRT (I checked on another working 182T and with the same controls set there's a spot and can be moved with horizontal position). It seems there's a spot just off screen around the lower right corner of the CRT, however it doesn't move with horizontal control. I checked the control grid and focus voltages and they seem to be ok, also the grid voltage changes with the intensity limit trimmer. On the first two times I powered the scope I heard crackling sounds and seen some "lightning-like" tracks on the CRT, the next times it didn't make any sound or firework on the screen. Now I think I should start to troubleshoot vertical and horizontal drivers, but the cracks and fireworks made me wonder about the CRT, can it be damaged? Please don't suggest me to swap the CRT with the working unit, I just tried to remove the connections on the neck but they seem stuck and I'm afraid I can damage the glass. I'm seeking for hints and advices, if the CRT is likely damaged I'm going to sell the old thing for spares and not spend more time with it. Thanks in advance and best regards Frank IZ8DWF |
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Re: Agilent E4420 series Sig Gen
Hello Paul,
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Thanks for the reply....am looking at a 4420B, I know it only goes to 2Ghz; I wonder if also supports the the functions you mention....I guess it may depend on installed options....Got any idea about fair or going prices? Thanks Again, Steve ----- Original Message -----
From: Paul Read To: 'hp_agilent_equipment@...' Sent: Friday, September 25, 2009 8:45 AM Subject: [hp_agilent_equipment] Re:Agilent E4420 series Sig Gen Hi Steve, I currently have an E4422b on my bench, and have found it to be very good. The unit I have has various modulation sources including a function generator, and the performance of that is excellent , I would certainly make room for one on my bench at home. It would replace at least 2 boxes there, so the XYL would be pleases :o) The unit also includes sweeps of frequency and power. Yum ! 73 Paul |
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Re: Part needed for a HP 6227B Dual Power Supply
Tom,
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Isn't it just a regular switch you can by from Mouser or Digikey? I have a 6228B that's similar, but I'll admit I haven't opened it up to look at the switches, though I probably should clean them. On a personal note, I hate slide switches. Erich --- In hp_agilent_equipment@..., "Tom Miller" <tmiller@...> wrote:
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FS: HP PCB assemblies
Hewlett Packard 427A -- Complete insides less meter: Two PCB's, Range & Attenuator Switch assemblies, etc, mounted to metal framework -- $20
Hewlett Packard PCB Assemblies -- $10 each 00745-66512 00745-66513 00745-66514 00745-66515 00745-66516 00745-66517 00745-66518 00745-66519 00745-66541 00745-66543 00745-66544 00745-66551 00745-66552 00745-66553 00745-66555 00745-66556 00745-66557 00745-66558 05326-20008 (less readouts) 05326-60002 05326-60003 05326-60004 05326-60005 05326-60009 05326-60013 05327-60002 05327-60003 05327-60004 05327-60009 69330-60021 More test equipment is available on my webpage: Also Test Equipment Manuals & some others at: Contact: Marv WC6W 310 649 3111 (reasonable hours Pacific Time please) |
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HP-182C repair
Hello all,
I'm trying to revive a 182C oscilloscope. I have the service manual, but it's for a different serial group. I think it should be enough close anyway. So far I've checked and set all low voltages and the cathode voltage. Then I tried to set the intensity limit but there's no visible spot on the CRT (I checked on another working 182T and with the same controls set there's a spot and can be moved with horizontal position). It seems there's a spot just off screen around the lower right corner of the CRT, however it doesn't move with horizontal control. I checked the control grid and focus voltages and they seem to be ok, also the grid voltage changes with the intensity limit trimmer. On the first two times I powered the scope I heard crackling sounds and seen some "lightning-like" tracks on the CRT, the next times it didn't make any sound or firework on the screen. Now I think I should start to troubleshoot vertical and horizontal drivers, but the cracks and fireworks made me wonder about the CRT, can it be damaged? Please don't suggest me to swap the CRT with the working unit, I just tried to remove the connections on the neck but they seem stuck and I'm afraid I can damage the glass. I'm seeking for hints and advices, if the CRT is likely damaged I'm going to sell the old thing for spares and not spend more time with it. Thanks in advance and best regards Frank IZ8DWF |
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Re: hp3561 info.
John Miles
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-----Original Message-----It's hard to say because the HP has a AGC loop that constantly adjusts the front end gain to maximize dynamic range. The floor's between -140 and -150 dBV/root-Hz according to the HPJ issue, which over a 100-kHz input bandwidth would raise the floor by about 50 dBV. With a sound card, full-scale recordings made with a line-level input correspond to about -10 dBV, but an SFDR of better than 100 dB is common even at full bandwidth. So, while the sound card can put a larger amplitude range on the screen, the floors are likely to be pretty similar as far as I can tell (I've never pitted them directly against each other). Dynamic range in FFT analysis is important in ways you might not realize immediately. For instance, when you use a 3561A to measure phase noise, you've got to use a series of switchable high-pass filters to keep the 1/f^n regions near the carrier from swamping the floor at higher offsets. You can't just hook it up to a downconverter and call it a day, or use a single HPF at an arbitrary offset like 10 Hz. ADCs with higher dynamic range make life easier. -- john, KE5FX |
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Re: hp3561 info.
John Miles
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-----Original Message-----If you have the bench/rack space, you might consider the 3562A or 3563A, which have similar bandwidth and ADC limits as the 3561A but give you two channels and some nifty firmware features. Otherwise I'd have to know something about your application. If you can use an I/Q multiplier of some sort to upconvert whatever you're measuring to a frequency within a stereo sound card's usable bandwidth, then the sub-10 Hz limitation may not be a deal-killer. (Plus, I believe some of the higher-quality sound cards do have DC coupling options these days.) I don't think HP built any FFT analyzers that went beyond 100 kHz that are affordable on the used market now. Could be wrong about that, though. -- john, KE5FX |
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Re: hp3561 info.
Luis Cupido
Tks John,
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Is there another HP model you would recommend as something really interesting instead of the 3561 ? (radio ham pocket, ebay etc) Yes below 10Hz is of interest :-( Luis Cupido. John Miles wrote: Anyone familiar with the hp3561 can tell meA combination of both. The December 1984 HP Journal has a good collection |
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Re: hp3561 info.
John Miles
Anyone familiar with the hp3561 can tell meA combination of both. The December 1984 HP Journal has a good collection of articles on its design. Some of them even had 1-Mb bubble memories. -Is the performance interesting or a good sound card + PCSound cards can be much better performers if you don't need sub-1 Hz response (most aren't DC-coupled) or the missing Nyquist headroom afforded by the 3561A's higher sampling rate (256 ksps versus 192 ksps max for most sound cards.) The 3561A's 13-bit dynamic range, single input channel, and limited record length are its Achilles' heels. The real difference is in software support. You can do a lot of useful DSP analysis work with sound cards that would be impractical with a 3561A. 3561As are unusually well-designed and packaged, so they will always appeal to the compulsive collector. :) But for the most part, you would only *use* one if you needed to run legacy applications like the 3048A package. -- john, KE5FX |
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Re: HP8559A mainboard issue
Dear Mattc:
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? Not so simple ! ? It is the defective in mainboard ! ? I have one working unit and a defective unit , I find the mainboard problem , just exchange ALL boards. ? Regard Tony Cheung SEP 25 2009 --- On Fri, 9/25/09, mattc <rmc321@...> wrote:
From: mattc <rmc321@...> Subject: [hp_agilent_equipment] Re: HP8559A mainboard issue To: hp_agilent_equipment@... Date: Friday, September 25, 2009, 10:24 AM ? Hi Tony, I'm not too familiar with this instrument, but doesn't the front panel of the 8559A have a Frequency Calibrator button to correct the errors between the displayed and actual frequencies? Matt --- In hp_agilent_equipmen t@yahoogroups. com, "tonycheung_ hk" <tonycheung_ hk@...> wrote:
[Non-text portions of this message have been removed] |
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Re: Agilent E4420 series Sig Gen
Paul Read
Hi Steve,
I currently have an E4422b on my bench, and have found it to be very good. The unit I have has various modulation sources including a function generator, and the performance of that is excellent , I would certainly make room for one on my bench at home. It would replace at least 2 boxes there, so the XYL would be pleases :o) The unit also includes sweeps of frequency and power. Yum ! 73 Paul |
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Re: 7562A Log Voltmeter/Converter
how many do you have??
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----- Original Message -----
From: David C. Partridge To: hp_agilent_equipment@... Sent: Thursday, September 24, 2009 12:02 PM Subject: RE: [hp_agilent_equipment] 7562A Log Voltmeter/Converter Arthur, no I'm not in the USA. I'm based in the UK. I understand what they do, but I don't need that function, and would happily sell them on to a new home rather than scrap 'em. (though I don't think that using them for a project qualifies as scrapping - they are very nice boxes). Dave -----Original Message----- From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of arthurok Sent: 24 September 2009 16:13 To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 7562A Log Voltmeter/Converter dont scrap it they were designed to logrithmicly compress a signal before going into a chart recorder if you dont like it maybe i can buy it from you. are you in the usa?? |
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Re: HP8559A mainboard issue
Hi Tony,
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I'm not too familiar with this instrument, but doesn't the front panel of the 8559A have a Frequency Calibrator button to correct the errors between the displayed and actual frequencies? Matt --- In hp_agilent_equipment@..., "tonycheung_hk" <tonycheung_hk@...> wrote:
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Re: Step attenuator repair stuff uploaded in files section
Thanks, Jacques! Got it.
Daun _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of ve2_azx Sent: Thursday, September 24, 2009 2:39 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: Step attenuator repair stuff uploaded in files section I tried to upload Lothar's file in the files section, but it was not successful. So I have provided a link to it on my web site. I have also added some more photos at the end. <> s.com/ve2_azx/HP_StepAttenuatorRepair.pdf Jacques, VE2AZX --- In hp_agilent_equipmen <mailto:hp_agilent_equipment%40yahoogroups.com> t@..., "Daun Yeagley" <daun@...> wrote: post. I notice that the file space for the list is pretty much full, andprobably needs to be weeded out. Might try uploading to another site, likeDidier's.
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Yiu On Tony C
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