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microscope / high magnification camera options for soldering, faults, and other examinations/inspections
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Having done enough (red) eye cracking smd soldering jobs or inspections in case of suspected failure (cold joints, etc.), I've decided to invest a bit on a better optical setup. There's plenty of cameras on the marketplaces and retailers out there, but what are some better choices? Good experiences with some specific models? Also, what to watch for? Specs, minimal magnification that crosses over a good threshold? I have a couple of large screens at my bench - I'm thinking this will be best done by shooting this over to one of those. USB, HDMI?... Lighting/LEDs making a significant difference? Thank you for your input. Radu.
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How to I disassemble the HP/Agilent 8495B attenuator ?
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Hello, I need to disassemble the HP/Agilent 8495B attenuator, there are no visible screws, how can I do it if I need to service the attenuator ? Thanks in advance!
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List, FS - Three plug in’s used in 8660’s. 2)- 86603A one has phase modulation capability. These are the high frequency units that go to 2600 MHz. 1)- 86633B, Modulation plug in. These plug in’s were all in use and working about a year ago when the 8660;s were retired, maybe one has a bad attenuator step. Sold as is, but as pictured and complete, $150.00 for all three shipped to your door, US only, L48. Gary WA2OMY
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Anyone have the 17090C Measurement Graphics Software for the 7090A Plotter
Hey All, I asked over on VinHPcom but apart for a pointer to the 17090B Software up on HPMuseum I didn't hear much back, so I thought I'd ask here as well. The C version of the software apparently works with Series 300 machines so I'm interested in trying to see if it works with my Viper machine. So if anyone has a copy I'd appreciate it if I could snag one from you. Thanks, TonyG
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I recently purchased this rare HP item off of eBay. It appears to be a trade show demonstration unit for selling HP's alphanumeric LED display modules. It is from 1970 (based on the date codes of the parts) and is made to a very high standard. As received it needed a very good cleaning to remove "residue of rodents" but once cleaned seemed to basically work without any repairs. The only remaining problem is a worn-out "DATA ENTER" switch but I found an exact replacement on eBay and will get that going as soon as the part arrives. This same unit is on page 3 of the July 1970 HP Journal (https://vtda.org/pubs/HP_Journal/HP_Journal_1970-07.pdf) and the corresponding article describes it in pretty good detail, although without schematics. All the ICs appear standard except for a mask ROM, and, of course, the HP display module itself. I am posting this here to document this rare item's existence and in the hopes that a former HP employee may be able to provide some more information on it.
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Keysight 33522a Binary Arb Files
Hi Alex, I used a demo version of Benchlink 33503A Pro to create triangle wave files in *.wvf, *.arb, and *.barb formats. For the 33522A, the waveform will appear on both channels simultaneously. Yves De : [email protected] <[email protected]> De la part de TomS via groups.io Envoyé : 23 mars 2025 04:19 ? : [email protected] Objet : Re: [HP-Agilent-Keysight-equipment] Keysight 23522a Binary Arb Files Hey Yves, I found a threat for a 33210 where you created a testfie for a User. Is IT possible that you create a small barb File with all possible Parameters for my 33522a? Thanks in advance Alex
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HP 10248 series data probe IC part number
Does anyone have handy the HP part number on the interface IC used in the 10248 series of logic analyzer data probes? The manual on the probe has all part numbers listed except for the IC that is part of the PWB assembly. I once came across a HP part number 1820-0919 that was believed to be the number but it crosses to a Motorola MC1650L which is a dual A/D converter, an obviously wrong part. Thanks, Greg
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E4421B Display Sorted
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About a year ago one of my E4421B signal generators developed a display contrast problem. I left it for a while and then decided to see what info i could find about the problem. After a while i decided i needed the services of Milan for the CLIP details, this was neatly done (thanks Milan). This info also was left for a while and then i finally took the cover off to see what was happening. As previously reported Q601 had an open BE junction. Mmm strange. But prior to this i measured some weird voltages on the LT1170 regulator and even worse an unusual to me configuration, the ground tab is connected to the 1mH switching inductor. So i confirmed the DAC was supplying a 0 to -10V control signal from the front panel-good but the output from the TL074 was jumpy as was the output from the LT1170 regulator with supplies of up to -46V being measured. Q601 was replaced (not the best thing to do) and the display was back for a minute and then it all went wrong again. Working at the LT1170 was not easy due space and depth issues so i rebuilt the supply on stripboard to emulate the problem. So i couldn't get these weird varying voltages even thought the control signal was fine. Almost there so it was the Schottky diode CR607 that was the culprit. The excess voltages explains the demise of Q601, C651 the 47 uf output capacitor was also replaced. I would suggest to any one with this problem to immediately connect a 24V zener across R625 the 2 watt 1K5 resistor and remove the 15 way flat ribbon going to the display to avoid damaging it whilst affecting repairs as $350 is a high price for a new one cheers Geoff GI0GDP
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8660 extension cables
HP list, the extension cables have been sold, Thanks for the responses, Gary WA2OMY
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HP list, with all the interest in 8660’s recently, I can offer this 11672A cable kit for sale. It is complete, but as expected the foam has deteriorated, everything will need to be cleaned. Hard to see but the cables and connectors are in very good condition, looks like it has not had much use. This is the kit to extend plug in’s, not mainframe board extenders. I used 8660’s for many years here, good piece of RF test equipment, but replaced with lighter weight/small size. $80.00 total shipped to your door, US only, L48. Gary WA2OMY
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Hello Community, I got a 33522a Arb Signal Generator. I'm still looking for a file format description of the binary arb file format ( *.barb ). I found some information about this format and I still can create this files with the basic Parameters - Number of Channel - Numbers of Data Points - Vmax - Vmin - Checksum - Datapoints I found some information about the ASCII Version of the file format ( *.arb ) and there are some more parameter i can set. The problem ist for using the whole 16M space i do need the binary file structure. Finally there are several 32bit or 64bit int / float values which are unknown for me. IT seems to me this unknown values could set a lot of interesting Parameters. Is anyone in this group who has a full description of the *.barb file format for the 33522a series? Alternative could be someone who hast the keysight sw benchvue with Wave Form Option for creating such binary arb Files. He could create a Set of Files with different settings. This could analyzed by my sw. Thanks and best regards TomS
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Cleaning N-tyoe cal kit
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Not strictly Agilent/HP, but I recently bought a 2nd hand N-Type cal kit for the 3 HP VNA's I have. I did originally want a new kit from Kirkby Microwave, but after 3 or 4 emails over the course of a few weeks with no response I gave up. So I have this 2nd kit, the pin depth checks out ok on it. Problem is the foam has deteriorated in the case, and some of it has got into the connectors. I've tried IPA with a swab and got the worst of it out, but some stubbornly remains. Any suggestions to dissolve the black sticky residue? Or otherwise clean these connectors. Problem number 2 is creating a definitions file for the 8519C, 8753C and 8571A although 85054A
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Hi, I repaired an 8591A for a friend, but the display on his screen isn't perfectly straight. I'm guessing there's an adjustment for that, but where is that adjustment? There are adjustments on the top for intensity, frequency, green gain, and horz. Coarse focus on the back, and focus on the side. I haven't attempted to remove the display yet. Yves
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OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?
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Have a failing/failed cooling fan from a HP machine with OPT 003 (400 Hz), which appears to apply to the type of fan installed. Are there any requirements (trying remember undergraduate EE class that described analysis of induction motors - does that describe a typical cooling fan of this sort? - but that is digging waaaaaaaaaaaaaaaaay back to the 70s... Should a generic 120 VAC 60 Hz fan of sufficient air flow be acceptable, or do I need search for a fan designed to support 400 Hz?)
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Hello, This is my first post here, thanks for allowing me in. I've had the chance to pick up an HP3403C True RMS voltmeter, serial 1452A03359, with options 0011 (Autoranging) and 006 (dB display). I bought it with its condition unknown. I know some of the parts inside are absolutely not replaceable but for the price it was a bet I wanted to make. So it came in the mail. It must have spent the last few years of its existence in a cellar as it had some slight facia corrosion damage, and absolute STINKS of mold. I have cleaned it thoroughly but it still smells a bit inside. The display is stuck on displaying +1V, blinking. If I set the speed to fast it blinks a bit faster. Sometimes it'll display rubbish until the next power off/on again. It seems to react to the switches as the comma moves with the ranges and the dB display also lights up. I have checked the power supply lines (following the procedure), they're good and I can't see much ripple on my oscillo. I'll replace the capacitors of the power supply but only when I know it works as to avoid unnecessary spending. I have removed all the boards in it (converter and options) only leaving the motherboard, PSU and the display unit and it is still stuck. I therefore believe the issue is not converter related but display related. The display is basically a 3.1/2 digit DVM built around a LD110 (digital processor), LD111 (analog processor) and an SN74LS47N decoder for the displays. Here's their datasheet, and Here's some additional info on the Tek wiki about the duo of LDs. I'm quite the beginner and lack some diagnostics knowledge. The display is also a rather convoluted assembly. Considering the high humidity storage it went through I suppose solder corrosion is not out of the question. I have already cleaned what I could (the boards were all perfect thought) and the gold plated connectors (also perfect) with isoprop. What would be your recommendations on what to try next? Thanks everyone, Arnaud.
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Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
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Have a HP 8485A sensor I bought used, turns out it had been damaged due to overload, seller refunded, now have a physically nice but electrically dead HP 8485A sensor. Have a HP 8481A sensor surplus to my needs. I'm interested in the possibility of converting my 8481A to an 8485A (3.5mm male connector), albeit not calibrated, in lieu of the cost of buying a working 8485A. Found a Keysight publication that seems to be quite comprehensive coverage of this era sensor: https://www.keysight.com/us/en/assets/9018-04931/service-manuals/9018-04931.pdf?success=true This is titled "Keysight 8480 series coaxial power sensors operating and service manual." I wasn't aware the manual existed; it is current publication from Keysight. The manual has pretty extensive "how to disassemble and reassemble" and other maintenance activities. The underlying thermocouple sensor element appears to be the same part number for 8481A and 8485A, so this brings me to my question - could I create a thermocouple sensor with a 3.5mm HP male connector that could subsequently be recalibrated and used as an 8485A? I've searched and haven't found any reports of the practicality or result of actually trying this procedure. Thanks for any comments, observations, or requests for clarification.
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Just wondering if anyone has experience loading a one-shot retriggerable waveform over Ethernet into a 33210A arbitrary waveform generator. I'd love to hear the Reader's Digest version of how I can do this. I need 10k points at a rate of 1 or 10 kHz. Peter
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How to recover the video of my graphic 54810-66505 card
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Hello, I have picked up an oscilloscope 54810 I have some problems on it, but it’s settled. Meanwhile, I tried to put the graphics card 54810-66505 on another motherboard (which also had its video output built in), for tests. Since the video card no longer provides output. The screen is black. If I put an old video card trident, the screen works. I think my manipulation must have "written" information in the chip 65550. (Some register?) What manipulation could reactivate it? NB: the card is visible in the bios pnp/pci parameters Your opinion. cdt
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A homemade diode power sensor for HP meters
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Hi guys, as you all know, the HP 435A, 436A, 437A and so on are quite nice power meters and the meter itself is availabe at quite low prices. However, the power sensors are quite expensive. I own a 8481A and a 8484A, both in nice and working condition, but I don't want to damage anything so I treat them like raw eggs and handle them extremely careful. So I always thought whether it would be possible to make a own diode power sensor which is compatible to the HP 436A. This would have the advantage that the 436A could be used (and therefore its HPIB capabilities), and if it works with the 436A, it will do so also with the other meters (and possibly others, I don't know). Further, the homebrew power sensor would be cheap and if it breaks, no matter, it can be repaired easily. So today I spent a few hours on making my own power sensor. I checked the schematic of the 8481A power sensor, and I did basically the very same. I came up with this schematic: (I don't want to waste valueable web space for the group, so I uploaded the high resolution pictures to my webspace) https://hb9fsx.ch/wordpress/wp-content/uploads/2018/11/20181117_173101.jpg The letters on the right side are the connector pins for the HP 436A, of course. Then I made a quick 'dead bug' style prototype, as follows.... (please don't laugh at me :-) ). https://hb9fsx.ch/wordpress/wp-content/uploads/2018/11/20181117_170657.jpg I connected to the 436A and I also installed a SMA 30dB attenuator at the input and connected my power sensor to the power reference of the 436A. At first, the readings were quite off a bit, but using the little trim pot on my PCB, I was able to precisely adjust the gain of my sensor such that the reading on the power meter was exactly 0.00 dBm. I then connected a signal generator to the power sensor and tested various power levels between -10dBm and +20dBm. Incredible, but my power sensor was accurate to 0.1dB! I also tested different frequencies between 1MHz and 2.6GHz. The flatness was not extremely good, but between +/-1dB. So, basically, the concept seems to work. I also tested different ranges for the power sensor - there is a 'mount resistor' inside the HP power sensors (8481, 8482, 9494, ...) which tells the power meter which range the sensor uses; the meter then internally adjusts the gain according to the power sensor range. It appears that it should be possible to home brew such power sensors. However, at the moment, I have two issues: a) the auto zero function does not work - even if I run the autozero feature, the power meter afterwards displays -13dBm anyway, so I cannot properly zero my power sensor. At the moment, I do not understand why this is so. Has anyone on the list an idea? b) I don't understand exactly how the amplifier using the NPN transistor works. When I was adjusting the gain of my sensor, I tried to change the collector resistor (330 Ohms), but this had almost no effect on the gain. The emitter resistor (1k Ohms) also had only little effect on the gain. Only when I placed the pot where it is now I was able to adjust the gain in a wide range. So it basically looks to me like this amplifier is a common emitter amplifier, with the gain being RC / RE, is that true? why then is a feedback from the emitter required to the meter? Thanks for any hints, tips and so on, Tobias HB9FSX
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looking for service manual for HP4934A
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Hello, Any one have a service manual for a HP 4934A? An electronic copy? Any good ideas where to find either a paper or electronic copy? It is for a TIMS. Transmission impairment measuring set. thank you for any help Brian
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