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Agilent 16700B / 702B correlation with DSO9000 Infiniium scopes
Hi, Did anyone try to link a 16700B or 16702B LA to an Infiniium 9000 series DSO or MSO scope? Due to their different generation this has not been documented. But as the suggested Infiniium 54800 are the ancestor of the 9000, maybe there will still remain a bit of code in the latter to correlate both via ethernet +/- the E5850A correlation fixture? Best, Christian
Started by Christian F1GWR @
HP 5343A SMA “Insert” 5
Anyone here know what this part is? I’m trying to get the SMA connector working on my frequency counter and it won’t work so I pulled apart the SMA connector and this little module that came out doesn’t pass any signal. Any idea where I could grab one?
Started by Brad Jackson @ · Most recent @
hp3456A auto zero 3
The auto zero function on my two hp3456A seems not to improve at all the Voltmeter DC drift that displays several Volts after a minute or two with input Open, probes not connected. Of course, zero is displayed when shorting the input. Do you know if this is normal, and if not how to fix? They pass all self tests. My two hp3478 are zeroing quite well in contrast with input Open. Thanks
Started by John Thefox @ · Most recent @
HP8595E - SYTF 20
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned Filter) with a huge insertion loss (>50dBm) Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres) Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was lying on the bottom of its own cavity (a pic taken with the microscope shows the sfere in front of the rod tip) I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it (if the operation is successful I will re-insert the rod and will try to find the correct alignment and rotation angle) Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of a mm in diameter (pic) from glue residues is something I'd gladly avoid Thanks for ideas adri
Started by alfa beta @ · Most recent @
Ink ( recipe ) for Hp 2225 Think Jet printer ? 20
Anyone brew Or have a recipe ( DIY or inexpensive bulk source ) for the ink used in the Hp 2225 Think Jet Printer cartridges ? ... to re-inject into the bladder of the original Think Jet Cartridge. What a great printer to hang onto old equipment ! thank you, rick
Started by gren @ · Most recent @
OT: a tale of two chargers.
This is a OT, but I thought I'd bring it up for comments: It was the best of chargers, it was the worst of chargers......... Laptop is an ASUS Q540V sold (at one time) by Best Buy. I needed an extra charger, so I tried the usual suspects. (working in two places and easier to have two chargers). Charger is 20 volts, 7.2 amps, 150 watts. Tried ASUS. Nope, not on their website. Tried Newegg, chinese clone. Tried Amazon, chinese clone with checkered background and heritage. Then decided to try a universal adaptor of known parentage.... Targus (have had them): not good enough Insignia <sigh>, ok, they had one. Stopped by a store in Brandon, Florida. Ok, they had it, but they don't recommend it. OK, why not? "It could ruin your battery by overcharging it. You need a 150 watt charger." how does this overcharge happen? "Well, it'll put too much power in the battery, so I can sell it to you, but I don't recommend it." Ok, put it back on the rack and then went to the Geek Squad. Got the same reasoning. So I asked suppose I have a gallon of water, and I only drink 3 quarts of it, what happens to the remaining quart? "Well suppose someone forces you to drink that extra quart?" I told him that I thought that the electronics didn't work that way, and the laptop charging chip would only draw as much as it needed and would automatically not overcharge the battery. They remained unconvinced. I decided not to reward them by buying anything. They suggested batteries plus.... ok After getting the wrong directions to that store, I found that BP only had a 120 watt max charger. OK.... I was the third person that day that may well have had the same problem. time passes....................................... On the theory of "better the devil you know than the devil you don't"....... I went down to the local BB store. I went to Geek Squad first. The young technical genius gave me the same story.... I asked him to find out from someone why this scenario was true (specifically, the damage the battery and laptop). Got the same answer from a more experienced (?) technician. Decided to take a chance, and went to the sales kiosk. They said that over would be more or less OK, and under would be a problem. On the box, the ratings say laptops *up to* 180 watts. I thought I saw Rod Serling leaning against a wall and smiling. Harvey
Started by Harvey White @
8558B project going nowhere 6
You ever get a great idea, carry it part way through and lose interest? Some years back, I was going to fix up an abused 8558 (I think it’s the B version - the one with the push buttons) that I picked up on the auction site. It has a pushed in lower part of the face, nothing gutswise looks damaged. It had it hooked up with a ton of clip leads and determined that the 1st mixer was shot. Replaced the diodes in the mixer and set it aside. 15 or so years past and it’s still sitting in the corner of the radio room. I know I’m never going to get to it; at least a dozen other stalled projects have higher priority. I’ve got 2 working SA’s and collecting them is becoming an addiction; its time give the orphaned projects a new home. Long story short, does anyone needs a parts unit? 99.9% of it probably is operational, I’ve just lost the oomph to dig in just to test it. Message me off the thread if you would have use for it. I can send pictures and such. Thanks for reading.
Started by WA2SCL_Jeff @ · Most recent @
85662A CRT 4
I recently picked up a display unit to match the 8566B I purchased a month or so ago, supposedly working fine, but I discovered the CRT was extremely dim, among some other issue with a sweep but no signal (flat line at the bottom of the grid). My attempts at rejuving the CRT to give me some use until having to replace it with either a CRT or a NewScope kit succeeded in brightening it up a little, so I figured I'd do it again, with a bit longer application of the little red button on my B&K 465... and promptly blew out the CRT. No great loss, as it was basically toast to begin with. I really like the idea of keeping this a CRT, at least until I get the 85662A working properly, at which time I might eventually splurge on a NewScope 8. In the meantime, does anyone happen to have a decent CRT for sale for this 85662A? This is the first generation display with the original style CRT - not the later one. I sure do miss Hawkeye picture tube remanufacturing. Regards, DE KD4PBS
Started by Matt Harris @ · Most recent @
HP 3326A with a DC offset calibration issue. Cal Error 193.
I have an HP 3326A on the bench that I would like to get up and running. I am currently thinking that a few of the small signal relays have gone high resistance and am curious if any one else knows a starting point. The unit will pass all self test Start up self calibration will error with error 193 Dc offset failure If both channels are set to more than 1 volt of DC off set both positive or negative calibration will complete with no issues. Setting Dc off set to 0 does function correctly. So when the unit has aligned its self all is good and working It is just the initial power up configuration is failing alignment. Has any one run in to this before and any ideas on which relays to start with or should I go another direction? Zen
Started by Zentronics42@... @
8665B noisy signal & Cal Errors 8
I have an 8665B with what I can best describe as a noisy signal; three side lobes to each side of the carrier, before disappearing into the noise floor. They are visible on <3GHz, but really shows as soon as the instrument switches to 3GHz and above. They are not stable dance around on the spectrum analyzer though the carrier signal is stable. I'll link to a video below: https://youtu.be/TcHVk-WHKps?si=PK1RgEfZCQklWx1z There are also a few CAL errors on startup. It's random which one shows, but it's commonly the first one: 1,078,311 COAX DSC 3,503,311 (Turn to conditions not covered by diagnostics) 3,504,311 FRAC-N As of now, I have not done much troubleshooting. I just pulled a few of the cards and looked for obvious issues (caps, burned traces etc.). I intend to go through the power supply as I have read of issues there, particularly bad caps, causing signal problems. Now for the good news: I have a fully functioning 8665B which I can swap cards with for testing if necessary though it would be nice to minimize this if possible. If anyone has suggestions I'm all ears. These are not the easiest units to work on, and there isn't much in the way of documentation or info out there on them. Pete W4PJB
Started by W4PJB @ · Most recent @
Help request - how to test an HP8350B RF plugin YIG 30
Hi, I recently acquired a replacement YIG for an HP8350B RF plugin (HP83592C) which was not producing any output (tested carefully according to the troubleshooting guide). I stripped out and replaced the YIG, along with making some other fixes to the mainframe. The re-assembled plugin works now, although needs some careful checking. The YIG custom resistors that improve the tuning linearity will be wrong as these (naturally) did not come with the replacement YIG. But that's a problem for a later time. After some of the mainframe fixes I'm not certain now that the original YIG was faulty. I don't want to go through a fairly long and complicated plugin disassembly/reassembly to confirm or disprove that. I'd like to test the YIG outside of the plugin and I have read that it can be powered and tested generally for output power etc - but I'm not sure how to do that. I've attached the HP schematic. There seems to be several supplies needed for operation. (see attached schematic with my annotations). There is a main coil current source, and an amplifier to drive it. Measuring the good YIG there seems to be about 5V across this main coil (-35V at one side and -40V at the other) driving a current of up to 200mA. I can set that up fairly easily with a power supply which has a variable current limiting output and a load resistor. There is +20V, +5V and -10V also. My question is how to bias the amplifier (labelled "osc bias" on the schematic?). If I set up the power supplies above and apply between 0V and -10V, will that bias the amplifier properly? I'm a bit unsure how to approach this, and I don't want to damage the YIG, so any advice would be very welcome. thanks Tony
Started by Tony @ · Most recent @
8601A Heat Sink Compound 3
Does anyone know if there should be heat sink compound on E1 & E2 hybrid modules? I have one unit that does and one that doesn't. The one that does have the compound has a problem with E1 output module but when I press on it, it starts working! I'm thinking that those surfaces might be used for a common (ground). Any ideas on that? -Bill Fuller
Started by howdyrichard @ · Most recent @
HP 182T Power Supply Troubleshooting 9
Hey everyone! Hope everyone is doing well. I've been working on a HP 8557A in a 182T mainframe on and off for the past year. Have been struggling with getting the 8557A working and I just acquired some additional tools/materials to continue troubleshooting. I went to power on the 182T and only the line indicator light came on. Checked the low voltage power rails and found all of them were low except the -100V rail. I isolated the A1 and A2 assembly boards (i.e. the low voltage power supply) from the unit to do further testing. I've shared a schematic below that I annotated with my measurements. Since I acquired the unit (non-working), I've had to replace two 9V zeners (VR2) and both resolved the power supply issues. This time the 9V zener was fine as I thoroughly tested it. I've checked all the passive components on the 100V rail and could not find any issues. I placed Q2 on my 576 and noted some very abnormal IV curves so I replaced it with a similar transistor, although I did not think it would resolve the issue (it didn't). The series pass transistor Q1 also has some odd curves but didn't look nearly as bad (or irregular). Of note is the large voltage drop across R4 from 96V to 7.7V, and the large ripple across C1. Granted, C1 is a low value cap and it tested fine, but I did replace it (no difference). Also verified C3 and C2 are good as well. The 56V zener is also good. A thorough visual inspection did not reveal anything obvious. All fuses are good. Any troubleshooting help would be greatly appreciated! -Frank
Started by Frank Mashockie @ · Most recent @
HP 141T Power Supply Help Needed 132
Good Evening to the group! First post but I've been reading a ton for a few weeks now. (I thought I posted this but I don't see it, so I'm reposting.. please delete if i did something dumb) I've got a 141T with a 1615a prefix. It's power supply was a mess when I got it, almost every fuse was blown and most supply's were measuring high. I replaced the V1 regulator tube with a string of diodes and began debugging more. It seems like most of the drivers and differential amps were having _some_ problem. I've measured most of the transistors out of circuit and replaced with parts as recommended by other posts. At this point, I've got improved but still not great results. I've checked passives as best I can and I have measured around the transistors a bit. Obviously trying not to blow anything up with the tight confines of the A2 board. With the supply wires on the left removed to the rest of the unit, general voltages are as follows: * +102v which seems decent * about -82v instead of -100v * 300v instead of 248v, if it were tubes I'd almost expect this with an unloaded supply but I don't think I do expect it here. * -1.5v instead of -12.6v. Acknowledging the dependencies between supplies, I'm starting at the -100v supply since +100 looks "ok" (for now at least). In the affected supplies, I "believe" all transistors and resistors are good but some of the zeners measure a little funky (maybe). Looking for guidance or advice to break down the problem a bit and work through it. TIA, Bill - WW1H
Started by Bill Berzinskas @ · Most recent @
HP 3310A Repair Advice 2
I recently acquired a non-functioning HP 3310A. I've found and corrected a couple of problems so far, but another problem remains and has so far eluded me. When I first powered it on, I noted that all of the power supply rails were reading way off (low). I traced the problem to a bad 9V regulator diode (A3CR26) and a bad pass transistor (A3Q31). I replaced both of these parts and now the power rails are in specification (DC and AC). Next, I noted that there was no output (other than a DC level) for all ranges of 10x and higher. The following descriptions are with the output amplitude set to the 9 o'clock position. They scale upwards as I increase the amplitude control. On 1x I get an output in sine, triangle, and pulse settings but the shape is completely wrong. On sine it is essentially DC +2V with some negative pulses on it. On triangle, it is -2V with a positive edge and a negative ramp followed by an equal duration of -2V before the cycle repeats. Dropping to 0.1x and lower the waveform expands to cover a symmetric +/- 2V range but the waveform shapes are still completely wrong. Examining the output of the triangle amplifier at TP4 reveals that the problem originates in this portion of the circuit. On 1x, the output waveform only goes from 2.5-6.5V and only ramps up. On slower settings, it goes from -4 to 6.5V but again only ramps up. I noted that Q18, Q19, and Q20 had been replaced in an earlier repair (NTE123, NTE128, and NTE129 respectively). A junction test of all of the transistors in the triangle amplifier circuit showed no problems. Same thing for all of the diodes in the circuit. I extended my testing to the +/-5V level detector. All of the transistor junctions appeared to be fine. However, when I tested the tunnel diodes, they tested as shorts in both directions (out of circuit). I know this is wrong and I eventually managed to get my hands on some replacements. The replacements measure around 0.5V drop in the forward direction as expected. I placed them back into the sockets and confirmed the orientation. I powered the circuit back up to resume testing it but unfortunately the behavior remained the same. The troubleshooting tree diagrams in the service manual were of no real help, so I decided I would check DC voltage levels in the triangle amplifier and surrounding circuits to see if I could find the issue. Unfortunately, there appears to be an elaborate feedback loop between the current sources, triangle amplifier, +/-5V level detector, and low frequency feedback amplifier so I'm not sure how useful a bad voltage reading will be. I found the voltages in the tuning amplifier and inverting amplifier were approximately correct. However, once I got into the bias network I started seeing some big anomalies. The emitter of A1Q5 was at 6.7V when it should have been +4V. A1Q5's collector was +6.6V instead of -1.5V. A1Q6's collector was 6.2V when it should have been -1.0V. However, A1Q6's emitter was -4.0V just as was indicated in the schematic. TP5 was 6.2V rather than the 1.2V it should have been. There were more discrepancies in the +/-5V level detector, but without breaking the feedback loop there is really no obvious way for me to know where the root cause of the problem is. I spent some time checking junction voltages on all of the transistors, JFETs, and diodes in the bias network, +/-5V level detector, and low frequency amplifier circuits but found nothing. While testing A1CR1 and A1CR2 in the tuning amplifier and inverting amplifier with power on, I observed that A1CR2 only had 4.4V across it rather than the 6.2V that A1CR1 had (they are both supposed to be 6.2V zeners). My schematic indicates that the output of A1IC2 should be -16.5V, but I believe that is an error and it should be +16.5. I was reading +19V here (as compared to -16.8V for the output of A1IC1). However, the voltages at TP2 and TP3 were nearly equal and opposite so I'm not sure this means much. A1CR2 may have been replaced in a past repair since it was not of the same type as A1CR1. I'm looking for advice or suggestions for how to further
Started by jasonb1963 @ · Most recent @
Hp 8563E Spectrum analyzer for sale refurbished and working 100% price 1650euro/ 1850US$ 3
For sale for 1650 Euro/ 1850US$ is one of Hp's top models. It goes from 30hz to 26.5Ghz. It is a synthezised controlled analyzer and measuring / counting frequency down to 1 Hz resolution. It is an E model that has a resolution bandwidth of down to 1Hz. This means you can see signals 60-70dB down a few hz next to the center frequency. DSP process is used at the lowest bandwidths. Hz offset from the carrier The E model has lower phase noise and lower noise floor which gives higher dynamic range. In addition, it has mounted an HP 85620A memory module. Two software packages are installed on the module 85671A Phasenoise measurement85672A Harmonic measurements etc. IMD etc The 63E has the following option H50 (I do not know what that is) There is plenty of light on the screen and is super focused with only around 3900hours of usage.It measures accurately and complies to specs and works 100%.More of the images shows the Frequency response on 1GHz, 10Ghz and 25Ghz. You can see that the it measures quite accurate. Signal generator was at -10dBm output.The analyzer is in super fine condition with some traces of wear. The YIG tuned filter (RYTHM) has been refurbished. Here is a link to Data on it. https://testequipment.center/Product_Documents/A gilent-8560E-Specifications-5D3D9.pdf HP 8560 E-Series Spectrum Analyzers - testequipment.center HP 8560 E-Series Spectrum Analyzers Technical Specifications HP 8560E 30 Hz to 2.9 GHz HP 8561E 30 Hz to 6.5 GHz HP 8562E 30 Hz to 13.2 GHz HP 8563E 30 Hz to 26.5 GHz HP 8564E 30 Hz to 40 GHz testequipment.center See model HP8563EIt can be sent by UPS for around 50-75Euro.I have a sturdy box it can be sent in. If any one want to travel these days it can be tested and picked up at my address. As the sale is private I cannot give any warrenties of course. For questions call or write.Best regards Peter OZ1LPR
Started by Peter Hansen @ · Most recent @
HP 8568A Spectrum Analyser not booting up. Both INSTR CHECK Leds on 13
Hi everyone. I bought a broken HP 8568A for dirt cheap. The display part works (test pattern can be displayed properly) but i can't get it to boot. Both INSTR CHECK leds are on and never shut off. The only sign of life i get outside the test patterns is a line appearing whenever i push the INSTR PRESET, Here is a video i made showing it Has anyone here experienced something similar ? Any ideas? Thanks
Started by azpo1928r@... @ · Most recent @
E4438c display problem, controler memory location please 8
Re Agilent E4438C Display Problem finding any info on the processor card not even block diagram (4400-60500). Unit has a display prob, thin vertical line and pixels missing hear and there. Plus what I would describe as mouse droppings, black blobs hear and there. Otherwise working and usable, not the display itself as I have swaped for known good one but no different. Slightly different every time powered up. This unit is different from the circuit posted on here, display controller is not on motherboard and appears to be on processor card (from tracing tracks back). I suspect the display ram but can't find any info on which chip it is. U20 hm6285128blfp-7 or U21 kr1016v10-v10 look possible but as they are soldered in don't want to do too much trial and error. Suspect controller is in one of the many fpga's. Any help please. John g8bxh
Started by g8bxh@... @ · Most recent @
Leaking alkaline cells 87
Duracell, especially AA size but others too, had a serious problem. They seem to have cured that, now have a 12 year guarantee. I have recently bought Duracell and Kirkland which are the same and have had good luck with them. The cells that leaked also had two dimples on the bottom, not there on the new cells. I suspect all dry cells leak but the Duracells had something peculiar about them. Not so sure this was a bean counter problem. Duracell was originally a Mallory product, the best available at that time. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998
Started by Richard Knoppow @ · Most recent @
8566B Performance Verification with 8620C 4
I have been puttsing through the 8566B Performance Tests and Adjustments manual for fun and am wondering if I can use an 8620C (with associated plugin) for the frequency response check instead of the 8340 series. To me, it seems the main thing you need is a nice flat sweep at -10dBm. However, I am an RF neophyte and have never used a dedicated sweeper. 8566B flatness performance requirements (at -10dBm): 0.06 to 2.5 GHz is 0.6dB 2 to 12.5 GHz is 1.7dB 12.5 to 20 GHz is 2.2dB 20 to 22 GHz is 3dB 8620C flatness with 86222A (0.01 to 2.4 GHz) is 0.25dB internally leveled and 0.1dB externally leveled. 8620C flatness with 86290B (2 to 18.6 GHz) is 0.7dB to 0.9dB internally leveled and 0.15dB externally leveled. Seems to be within the spec up to 18.6 GHz. 86222A hits it on the lower frequencies even with internal leveling. However, I am not sure about getting these specs at an output of -10dBm. Do I need an attenuator? Will this compromise the output flatness? Seemed worthwhile to compare the 8620 to the quoted 8340A. However, from a quick glance at the 8340A spec sheet, it is not as straightforward for externally leveled info. For the internally leveled flatness at output power of -10dBm it quotes 0.9dB (0.01 to 2.3 GHZ), 1.6dB (2.3 to 20 GHz), 2.1dB (20 to 26.5 GHz). So, this makes sense why you need to have the 8340 externally leveled in order to be within the flatness spec of the 8566B. As a side note, it is interesting to view the progression from "Sweep Oscillator" to "Synthesized Sweeper" in the HP Catalogs and how it really seemed to be a game changer. Thanks for any insights! -Michael Bierlein
Started by Michael Bierlein @ · Most recent @
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