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Re: I told you not to connect it to the transmitter
At 12:22 02-09-11, you wrote:
Hmmm.... then burned, thrown in a canal, left to soak for five years, and cleaned with the garden hose? ;-) Some inox screw may still be good, and considering the price of HP screws those days on 'bay... Marco IK1ODO |
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Re: HP 343A V.H.F. noise source
--- In hp_agilent_equipment@..., Doug <dmcgarrett@...> wrote:
Hi thanks to all for the lot of information I received. I will use them. The tube used in my device seems not to be a 5722, the pin out is quite different. From the info received I see that this seems not to be so important because I will build up a pover supply according to the needs of my unknown tube; the performances are not influenced by the tube type. Only one question which can be a reasonable anodic voltage to be used ?Not too much for the life of the tube not too low for not reaching the performances needed. Thanks to all Gianfranco |
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Re: X-Y to VGA/USB converter
hpnpilot219
Agreed. Self-contained in the unit itself is best as well.
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You will need at least a set of two 10 bit converters for X and Y and a lesser resolution but similar speed converter for Z modulation. Jumpers for the different typical instrument voltage levels would be nice as well as pots for fine tuning of gain and offsets. Just some real basic analog stuff. Power should be a wide range input of say 6 to 24 volts, a LDO probably, and you may want it analog so as to not have to worry about noise. If you think 100 kHz is sufficient then perhaps an AD7993 would be good, 2 uS and 4 input channels. LTC has a bunch of very high speed ADCs(10's of MHz), but, heck, so does everyone these days. You want unipolar or bipolar inputs for your analog front end of course. It will come down to price. If you get the right family you could even go 12 bit or more as options. I would say to avoid the fancy features initially. Don't bite off too much, you can always release more features in firmware later on. Peter Let's see if this posts. I am getting frigging tired of the "Unable to deliver your message" Yahoo BS. --- In hp_agilent_equipment@..., "W2HX" <w2hx@...> wrote:
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Re: X-Y to VGA/USB converter
My understanding of SA's is that their displays are not fast.
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There is no advantage is sweeping too fast and a lot of disadvantages. I can't imaging needing more than 100KHz of bandwidth on the X and Y axes. That should give you plenty of time to draw the spectrum graph and the little bit of text. As long as you are faster than the human bandwidth there is no need to go faster. Pete. ----- Original Message -----
From: Kuba Ober To: hp_agilent_equipment@... Sent: Thursday, September 01, 2011 8:23 PM Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter > What is the speed of the old Tek and HP X/Y monitors? The question is: are those fast enough to be used to replace what was inside the box of various otherwise useful HP instruments. I'm also more than willing to have potentially extra functionality included, perhaps bypassing some of the circuitry in the instrument. My favorite would be to have a swept FFT by taking in directly the baseband output from a SA -- with a 16 bit ADC it should be feasible. I'm also looking at digitizing the frequency of the LO outputs from a SA to obtain precise frequency for any part of the display. I think I previously incorrectly said digitizing IF -- that's of course possible, but it'd be the last IF if anything. Inputting any number of LOs and digitizing their frequency should be very simple, as would be calculating the resulting center frequency. I think the hardest part would be to make sure my device won't pollute the LOs, so I'd be learning some new tricks too. My starting point is to run my 7L14 with a mainframe with no CRT, then to tap LO1 and LO2 outputs for precise center frequency, then to tap directly into the last IF output before the video processor (detector, LOG/LIN, digitizer). I can't really afford to get various other instruments that this would work with, so I thought it'll be easier to ask for ideas instead of having to rummage through downloads of HP manuals. So my appeal is as follows, to make it easy and technical: if you have a SA or another instrument that you'd like to get a replacement display for, give me the specs on its X-Y-Z outputs, and also on the LO frequency ranges and levels -- obviously if those LOs are available as outputs without disassembly. That's give me some idea as to how to set up the signal processing (gains, bandwidths, etc). Kuba |
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Re: X-Y to VGA/USB converter
Steve Fowler
Kuba,
I have an HP 8568B at the moment and would like to see something like you describe developed for it, and for the 8566B too, which I hope to acquire soon. The output specs are widely available and there were many units produced that now have aging displays. From 1978 to 1997 if I'm not mistaken. If I were making something like you mention, I'd start with this market and compete with the color LCD replacement currently available at a hefty price. I don't have the knowledge to do that though, and I wish you well with this endeavor. I'd be happy to take measurements of my SA's outputs or evaluate a prototype for you. Steve On Thu, Sep 1, 2011 at 7:23 PM, Kuba Ober <ober.14@...>wrote: **What is the speed of the old Tek and HP X/Y monitors?The question is: are those fast enough to be used to replace [Non-text portions of this message have been removed] |
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Re: X-Y to VGA/USB converter
Personally, I like the no-PC approach. Don't have to worry about hard drives
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failing, reinstalling long-obsolete operating systems, etc. I like a piece of hardware (with embedded software)! -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Kuba Ober Sent: Thursday, September 01, 2011 8:10 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter There will be a frame buffer, that's not a problem, and a video DAC as an option -- it's one chip these days, not expensive either. PC is of course cheap, but you may not wish to use one -- this is meant to interface an instrument to a stand-alone off-the-shelf dirt-cheap monitor OR a PC. Kuba On Sep 1, 2011, at 6:24 PM, Peter Reilley wrote: If you go with VGA, DVI, HDMI or any other pseudo videomonitors. with 10MHz bandwidth, and nothing else.output from SA's and do level measurement and filtering or even swept FFT. Thiswould come at a small incremental hardware cost, but obviously would be very useful.company specanabout using this for my 8566/68 specans. They have a product called the hasto them for comment on the applicability of the "tempest" version (which response....nothing to do with electronic eavesdropping) and this is their ------------------------------------ Yahoo! Groups Links |
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Re: X-Y to VGA/USB converter
What is the speed of the old Tek and HP X/Y monitors?The question is: are those fast enough to be used to replace what was inside the box of various otherwise useful HP instruments. I'm also more than willing to have potentially extra functionality included, perhaps bypassing some of the circuitry in the instrument. My favorite would be to have a swept FFT by taking in directly the baseband output from a SA -- with a 16 bit ADC it should be feasible. I'm also looking at digitizing the frequency of the LO outputs from a SA to obtain precise frequency for any part of the display. I think I previously incorrectly said digitizing IF -- that's of course possible, but it'd be the last IF if anything. Inputting any number of LOs and digitizing their frequency should be very simple, as would be calculating the resulting center frequency. I think the hardest part would be to make sure my device won't pollute the LOs, so I'd be learning some new tricks too. My starting point is to run my 7L14 with a mainframe with no CRT, then to tap LO1 and LO2 outputs for precise center frequency, then to tap directly into the last IF output before the video processor (detector, LOG/LIN, digitizer). I can't really afford to get various other instruments that this would work with, so I thought it'll be easier to ask for ideas instead of having to rummage through downloads of HP manuals. So my appeal is as follows, to make it easy and technical: if you have a SA or another instrument that you'd like to get a replacement display for, give me the specs on its X-Y-Z outputs, and also on the LO frequency ranges and levels -- obviously if those LOs are available as outputs without disassembly. That's give me some idea as to how to set up the signal processing (gains, bandwidths, etc). Kuba |
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Re: X-Y to VGA/USB converter
There will be a frame buffer, that's not a problem, and a video DAC
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as an option -- it's one chip these days, not expensive either. PC is of course cheap, but you may not wish to use one -- this is meant to interface an instrument to a stand-alone off-the-shelf dirt-cheap monitor OR a PC. Kuba On Sep 1, 2011, at 6:24 PM, Peter Reilley wrote:
If you go with VGA, DVI, HDMI or any other pseudo video |
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[Fwd: Agilent Discussion Forums - We're moving to a new platform]
J. Forster
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---------------------------- Original Message ----------------------------
Subject: Agilent Discussion Forums - We're moving to a new platform From: "Agilent Technologies" <site_assistance@...> Date: Thu, September 1, 2011 3:47 pm To: jfor@... -------------------------------------------------------------------------- Dear Valued Customer, You are receiving this message because you are a registered user of Agilent Discussion Forums. In October, Agilent will be moving Agilent Discussion Forums to a new platform. This new platform will bring several new benefits. Learn more here: Our goal for this migration is that no post and no active user will be left behind. We will migrate all posts, all attachments and all users with their current usernames that have active accounts in the current forum. We will communicate more as we get closer to the new forum launch. Best Regards, Ian Wright Discussion Forums Administrator Agilent Technologies ________________________________________ This information is presented by Agilent and our authorized partners, based on our understanding of your interest. If you prefer not to receive, reply to the sender or contact us at site_assistance@.... Please add the agilent.com domain to your safe sender's list in your email client. Our privacy statement is available at: www.agilent.com/go/privacy and describes our commitment to you regarding privacy. We welcome any questions about Agilent's privacy program at: privacy_advocate@... or write to: Privacy Advocate at: 5301 Stevens Creek Boulevard - PO Box 58059- MS 1B-CQ - Santa Clara, CA 95052-8058. (C) Agilent Technologies, Inc. 2011 |
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hp 8935 e6380a santa cruz
digiopi
Hi there,
I recently acquired an e6380a w/ option 1d5 for use on a local ham repeater project with the santa cruz amateur radio club. the unit passes all internal tests (service4 rom module) but i am looking for help with calibration. Is there anyone in this area (san francisco bay area/ east bay/ south bay) who could help us with the proper equipment? regards, oliver kj6ldd |
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Re: X-Y to VGA/USB converter
If you go with VGA, DVI, HDMI or any other pseudo video
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interface they you must include a video frame buffer, video speed D/A converters and the logic to support it. Even though LCD screens include a memory cell at each pixel it is not useful to you given those interfaces. They scan the video just like the old CRT monitors. You can't beat a PC for cheep high quality video. What is the speed of the old Tek and HP X/Y monitors? Pete. ----- Original Message -----
From: Kuba Ober To: hp_agilent_equipment@... Sent: Thursday, September 01, 2011 5:44 PM Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter That's "almost" what we want, but not exactly. It has a fixed 800x600 resolution, and it will look like crap on widescreen monitors. For some reason everyone must be watching movies on their monitors, because non-widescreen aspect ratios are disappearing. I've recently been to a local Microcenter and the best deals were only to be had on widescreen units with ridiculous resolutions (say 1600x1000). I'm thinking of something that would be $100 in parts for a basic version, optimized for use with real instruments not some imaginary specs someone thought up. This means: 1. Input channels with ranges that allow 1:1 connection to a selection of popular instruments (here I need *YOUR* help!). 2. Screen colorization options -- again, based on behavior of real instruments. 3. Use with available and "future-proof" monitors -- that means analog VGA would be one option (solder a DAC), DVI another (solder LVDS drivers). I think that for spectrum analyzers it'd be cool to have an option of double IF inputs and on-board frequency counting to generate an accurate X position and on-screen display/cursors. Again: I need input from *YOU* as all I have is a Tek 7L14 SA plugin. I would need to know what are the output levels, frequency ranges, etc. on IF outputs from various SAs. Obviously the board would have room for various options (VGA output, DVI output, USB output, IF input, etc) and they'd be populated as needed. So a basic version may have USB interface and three 12 bit input channels with 10MHz bandwidth, and nothing else. Since it smells like an FPGA-based solution, it's not unthinkable to have an optional high-resolution (16 bits at 50+ MSps) channel to take video output from SA's and do level measurement and filtering or even swept FFT. This would come at a small incremental hardware cost, but obviously would be very useful. Cheers, Kuba On Sep 1, 2011, at 4:12 PM, W2HX wrote: > Check out vectorVGA Tempest > > > $179. However, some scaling input will be needed. I inquired to this company > about using this for my 8566/68 specans. They have a product called the > VectorVGA PRO which is $2000 and will do what we want out of the box. > However, that's a lot of coin! I sent the XYZ specifications of my specan > to them for comment on the applicability of the "tempest" version (which has > nothing to do with electronic eavesdropping) and this is their response.... |
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Re: X-Y to VGA/USB converter
I don't think that audio frequencies are anywhere near what is needed
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for most instruments. To maintain accurate display I'm thinking of at least 1MHz bandwidth -- that means 5 to 10 Ms/s sampling rate. If any popular/good instruments need more, I'll design for that. Some ADCs come in various speed grades and resolutions but same package, so that you can easily scale down and save money while preserving the board layout and digital processing. Cheers, Kuba On Sep 1, 2011, at 10:43 AM, Peter Reilley wrote:
Perhaps another approach might be easier. Use a PC and an A/D |
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Re: X-Y to VGA/USB converter
This is fine and dandy, but for real instruments you need
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VectorVGA Pro, and it looks like it's neither designed to be affordable, nor was their NRE "cheap". Once you decide to use an FPGA (like they must surely do), it's cheap to select one that got enough power to do more useful things than merely drawing stuff. That's why I need input from people who have instruments that they'd like to interface with. Cheers, Kuba On Sep 1, 2011, at 4:03 PM, Christophe Huygens wrote:
Hi Bill, |
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Re: X-Y to VGA/USB converter
That's "almost" what we want, but not exactly. It has a fixed
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800x600 resolution, and it will look like crap on widescreen monitors. For some reason everyone must be watching movies on their monitors, because non-widescreen aspect ratios are disappearing. I've recently been to a local Microcenter and the best deals were only to be had on widescreen units with ridiculous resolutions (say 1600x1000). I'm thinking of something that would be $100 in parts for a basic version, optimized for use with real instruments not some imaginary specs someone thought up. This means: 1. Input channels with ranges that allow 1:1 connection to a selection of popular instruments (here I need *YOUR* help!). 2. Screen colorization options -- again, based on behavior of real instruments. 3. Use with available and "future-proof" monitors -- that means analog VGA would be one option (solder a DAC), DVI another (solder LVDS drivers). I think that for spectrum analyzers it'd be cool to have an option of double IF inputs and on-board frequency counting to generate an accurate X position and on-screen display/cursors. Again: I need input from *YOU* as all I have is a Tek 7L14 SA plugin. I would need to know what are the output levels, frequency ranges, etc. on IF outputs from various SAs. Obviously the board would have room for various options (VGA output, DVI output, USB output, IF input, etc) and they'd be populated as needed. So a basic version may have USB interface and three 12 bit input channels with 10MHz bandwidth, and nothing else. Since it smells like an FPGA-based solution, it's not unthinkable to have an optional high-resolution (16 bits at 50+ MSps) channel to take video output from SA's and do level measurement and filtering or even swept FFT. This would come at a small incremental hardware cost, but obviously would be very useful. Cheers, Kuba On Sep 1, 2011, at 4:12 PM, W2HX wrote:
Check out vectorVGA Tempest |
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Re: X-Y to VGA/USB converter
Haha. 240Hz sampling rate at 10 bits.
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On Sep 1, 2011, at 2:01 PM, Doug wrote:
DI-194RS |
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Re: X-Y to VGA/USB converter
I'm thinking of something where you plug it in and it works,
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with or without a PC. I don't think *that's* available. Kuba On Sep 1, 2011, at 10:34 AM, Christophe Huygens wrote:
These are available, I think this was discussed before. |
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Request for HP3312a Model Information
br4av01
Most available information on the 3312a function generator lists serial numbers beginning with 1432A-- I have a later version with 2901A-- prefix and wondered if there are significant differences in the production runs?
I have one 3312a with s/n prefix 1432A- that has a an HP sticker reading "Option 1107" or perhaps "Option H-07". Would anyone have information regarding it? Thanks for your help. -br4 |
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Re: Favorite bad capacitor debugging techniques?
The last switched PSU I repaired two weeks ago, was an standard artysan power supply, I think is a 5 volts+ 15 and -15 volts or so, there are different models of 5v+12+-12Volts etc..I think this model is used in HP service monitors also.
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the power supply shutdown sytematically the thermal switch of the laboratory, the fuse of the power supply was intact all times. there was a power fet in short circuit, after changing the fet I found a power diode in short circuit also, was the 5 Volts section rectifier, the power supply is working now but I am thinking of recap all the electrolitic capacitors, including the big 100uFarad 350Volts. I bought and made a German kit from ebay, ANTronic is the maker, it is an cute ESR kit with LCD digital display powered by a 9 volts R22 battery, is nice but as the instructions are in German I have to translate it to start to practice with it. Sometimes the caps ar not the sole problem of the power supply, by the time the heat sink grase and heat make the semiconductor to fail. Of course if you repair a power supply is a good thing to change the capacitors. I am keeping all the capacitors I change in my daily work repairing all devices to train myself using the ESR meter. Sometimes you have a flat TFT monitor that fails and try changing all the capacitors and voila... capacitors are not the problem and you are confused. Thaks for reading. --- In hp_agilent_equipment@..., David Speck <Dave@...> wrote:
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