hybridfree/eevblog-posts huggingface dataset:
Agilent E3633A / E3634A Power supply - current calibration (13mA offset) - Page 1
Forum section: electronics / repair

author: michal82
author_rank: Contributor
timestamp: April 05, 2020, 02:03:25 pm
content: HelloI already have a working E3633A. He had a damaged transistor Q5.The power supply is functional but has an offset in the measurement of current, which I cannot calibrate.After switching the output on, the display shows 13mA.However, the output current is 0mA because there is no load.I suspected that this was an error generated by the ampmeter in the power supply.To remove this incorrect indication I even gave a 20k potentiometer to compensate input offset on the U44 opamp. I connected 20k pot between between pins 1 and 8 (Vos trim) and 7 – it is responsible for measuring the current on the display.Thanks to this, I could set 0mA on the display when measuring current.However, CC settings were still incorrect.To align the CC settings and current measurement, I performed the calibration procedure again.To my surprise, after calibration the previous 13mA result returned on the display, the potentiometer settings were leveled.So calibration “works” because it removes the offset caused by the potentiometer, which appears on U44.Potentiometer re-adjustments 0mA on display and calibrations procedure caused the same behavior, so I removed the potentiometer.The -13mA current is generated from the current source R147 and Q7.When the CC setting is below 13mA, the output current begins to flow in the opposite direction from the Q7 current source and the voltage is negative -0.4V .When setting CC is 0.001mA the current flowing to the output is -12mA.CC= 0mA output curent is -13mACC=13mA output curent is 0mACC= 20mA output curent is 8mAMaybe someone knows where the problem is.Michal

author: gerrysweeney
author_rank: Regular Contributor
timestamp: April 05, 2020, 03:09:29 pm
content: Hi Michael,Looking at the video, I don't think you have an offset or cal issue, there is definitely a fault. I would suggest you are going to need to look at each stage in isolation and determine if it's working as expected - the is no easy fix for these, its just an (isolated if possible) scope, DMM and lots of time sadly. Good luck with the repair.Gerry

author: CM
author_rank: Contributor
timestamp: August 14, 2024, 03:32:32 pm
content: I have a E3633A that fails OCP calibration. I use an external shunt resistor to measure current, so it's not noise from an Electronic Load.The actual operation of the OCP is within spec. When OCP is set to 20A, it trips at 19.8V, which is within the specification of +/- 0.5% 0.5A (which is +/- .5A at 20A). Since the OCP works as expected, what can I do to address the calibration issue? What does this unit do when it internally calibrates OCP and OVP?All other functions work fine. The unit passes all verification tests when the sense inputs are not shorted to the main + and - inputs. When they are, it fails the Voltage programming accuracy and readback tests at 20V. But I think that's related to Op Amp U36. I don't think that's in play for OCP calibration.Thanks in advance for any guidance.
Agilent E3634A Repair and a question. - Page 1
Forum section: electronics / repair

author: Runco990
author_rank: Frequent Contributor
timestamp: August 07, 2021, 05:10:11 pm
content: Back again! This time it's an Agilent E3634A power supply. I traded my previously repaired E3631A to a friend in favor of this one, as I require the occasional 48V at a higher current, so this one is perfect for my needs.I have actually repaired it already, BUT... I am looking for replacement binding posts.... As usual, someone just HAD to hamfist this and gouge up the front of all the jacks. It's usable, just UGLY.I have been looking, but does anyone know where I could find a replacement set? These are the type that solder direct to the circuit board by the looks of it.Also looking for a rear bezel. (missing, but not a deal breaker)This supply is NOT like the E3431A which has individual jacks that has wires soldered to them, so the standard posts don't fit. It's an integrated assembly.Attached a pic... of course it's an obsolete part....
Agilent E3642A Unreg and ripple above 17.5 V - Page 1
Forum section: electronics / repair

author: JohnPi
author_rank: Regular Contributor
timestamp: May 17, 2020, 10:00:34 pm
content: My E3642A doesn't work well. When I look on the scope, at output voltages above 17.83, it shows a 120 Hz ripple, and the DC output voltage isn't very accurate. at lower voltages it is reasonably accurate. In addition, when I turn the knob to adjust the voltage, it jumps in steps of about 1.1 V in the display, not 1.0 as you would expect.Before I tear it open and look at the transformer and caps, are there any suggestions for what to expect ? This unit was from the auction site and appears to have fallen on its front -- the front binding posts are damaged, but nothing else seems amiss. It can supply the rated currents.

author: JohnPi
author_rank: Regular Contributor
timestamp: May 17, 2020, 11:21:22 pm
content: I opened it up and probed some voltages. The main transformer output wires (Red, Black, White) had 26 V red-black, and 13 V black-white. Suspecting that was not providing enough headroom for the regulator, I moved the 2 slide switches beside those connection points to the '100 V' setting instead of the '115 V' setting it was at (IDOhave 115 VAC). Now those voltages are ~ 30VAC and ~16VAC and the output goes to 21.8 V without any unregulated error. It also calibrates correctly for output V & I.I don't know if the transformer is damaged (from a drop) -- it doesn't seem to overheat..While the output voltage is correct at light and moderate loads; if I load above about 2 A, it comes unregulated again :-(. Are any (even partial) schematics of the power stage available ?

author: JohnPi
author_rank: Regular Contributor
timestamp: June 02, 2020, 04:55:28 am
content: I was able to fix the unit.The design has a transformer with 14 V and 22 V outputs. For the low V (8 V) range, the 14 V tap is used, for the 20 V output, the 22 V tap is used. This switching is via triacs that are fired via optocouplers. I'm not sure why, but there is a phase controller IC which seems to be used to fire the triacs at the most appropriate time. After replacing the triacs (which weren't bad), checking the optocouplers and their driver (which all seemed good), I eventually found the original service manual online with real schematics. Tracing the circuit through, I found the PCB trace open circuit between P106 and CR601 on the following schematic. It may have been broken if the unit fell. A new jumper wire fixed it !The manual is athttp://ftb.ko4bb.com/getsimple/index.php?id=download&file=HP_Agilent/Agilent_E3640A_E3641A_E3642A_Power_Supply_Service_Manual.pdfThe relevant schematic is
Agilent E3645A schematic - Page 1
Forum section: electronics / repair

author: sdscotto
author_rank: Contributor
timestamp: June 03, 2022, 10:16:41 pm
content: Could anyone point me towards a schematic or service manual for the E3645A please?I called Keysight and they sent me the user's guide saying that is the only manual available. It has a component location guide, but no schematic, parts, or values.I'm hoping someone might have had better luck.Thanks in advance!scotto

author: RomDump
author_rank: Regular Contributor
timestamp: June 04, 2022, 12:42:21 pm
content: Quote from: sdscotto on June 03, 2022, 10:16:41 pmLooks like they removed the schematic part from the latest service manual.See here for schematics:https://xdevs.com/doc/HP_Agilent_Keysight/E364xA/E3646AE2.pdf

author: alm
author_rank: Super Contributor
timestamp: June 04, 2022, 07:59:27 pm
content: Indeed, you need an older version of the manual before they removed the schematics. This should be the correct one for the single output models, including de E3645A:https://xdevs.com/doc/HP_Agilent_Keysight/HP%20E3640A%2C%2041A%2C%2042A%2C%2043A%2C%2044A%2C%2045A%20User.pdf

author: sdscotto
author_rank: Contributor
timestamp: June 11, 2022, 02:59:35 am
content: Gentlemen,THANK YOU very much!scotto

author: sdscotto
author_rank: Contributor
timestamp: November 08, 2023, 11:27:19 pm
content: Would anyone be able to point me in the right area to find out why the E3645A voltage is varying wildly and showing "Unreg" on the display?It had been working fine since the last repair in June of 2022 where C311 had shorted (burning the PCB), and the fuse on the 18V secondary (Green wire, inline) had blown. At that time I also replaced the RIFA caps (C177, C178 & C179).Without any noticed event it is now unable to maintain a steady voltage and "Unreg" annunciator is either on steady or flickers.The sense lines are connected as normal on the rear connector. It happens at any voltage in any range with or without load.I'm not smart enough to find this one and am hoping for some pointers on where to be looking.Thanks in advance,scotto
Agilent E3646A - odd voltage fluctuations on channel 1 - Page 1
Forum section: electronics / repair

author: spiff72
author_rank: Regular Contributor
timestamp: June 10, 2019, 03:33:32 am
content: Hey all,Wondering if anyone might have some troubleshooting tips for this bench PS. It was a recent Ebay acquisition that seems fine at first, but I am now seeing some strange fluctuations in the output voltage of channel 1. Channel 2 seems fine so far.The linked video below shows a recording I took during one of these odd occurrences. There is no load on the supply and I think I had the output voltage set at 20.00v. One thing I am trying to understand is whether the SET voltage is dropping or just the output. There also appears to be a fair bit of noise on the scope measurement I was taking, but I dont know if that is on the output or if it is noise I am picking up with some font jumper wires.There is a bit of additional info in the description of the video, too.Thanks!

author: spiff72
author_rank: Regular Contributor
timestamp: June 11, 2019, 02:44:09 am
content: One additional video showing it connected to a digital meter instead of the scope. The meter is a lot slower to respond to the voltage changes, but the values just show it isn't only the display of the PSU that is showing the droop/recovery.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: June 12, 2019, 03:58:09 am
content: The channels have a feedback loop, what you see on the display is a read back of what the output actually is, not what it is set to, so from that you know that the unit is getting the correct feedback, so therefore it must be an output control issue.The output is fed via a mosfet, which is controlled by a couple of op-amps and also ties to the supervisor IC (at least for channel 2), which is used to shut off the output at power up to give time for things to stabilise, my initial suspicion would be the supervisor IC going leaky and starting to turn off the mosfet, you can test voltages at the mosfet feed circuitry to confirm (it is passed through a diode as is the control loop so you can see which signal path is pulling it down, the control loop or the supervisor IC).Channel 1 has an op amp connected in a similar way to the supervisor IC of Channel 2, test each channel independently as they are slightly different, but linked in some ways.I cover this circuitry a bit in the repair videos I did on a unit, which explains how that section works. I have a few videos on the unit so you may be interested in them.I discuss the circuit design at 35 minutes on the Part 2 video.Full playlist for all E3646A videos I have done:https://www.youtube.com/playlist?list=PL2z3V9RkHQE2Twk6VoEBURx88TDXPKVSP

author: spiff72
author_rank: Regular Contributor
timestamp: June 12, 2019, 12:48:11 pm
content: Thanks so much for the reply and guidance!I will check out those videos later tonight. I reached out to the seller after seeing this, and they are offering either a partial refund or offering to accept a return. I think I may do the partial refund at this point, since I think this is a very nice supply for the price I paid (after this partial refund).Thanks!
Agilent E3649A Power Supply - Page 1
Forum section: electronics / repair

author: C-47
author_rank: Regular Contributor
timestamp: February 19, 2024, 07:57:02 am
content: On inspecting a newly acquired above power supply, the input line capacitors indicate a need to be changed, the 100n X2 Rifa no problem with a replacement, but the 2 smaller 1n0 are Y2 rated, are not easy to find, any problems seen in replacing these with X2 rated items. Thanks for any input, Alan.

author: J-R
author_rank: Super Contributor
timestamp: February 19, 2024, 08:07:47 am
content: https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/

author: George Edmonds
author_rank: Frequent Contributor
timestamp: February 19, 2024, 09:16:51 am
content: HiLegally you must NOT replace Y capacitors with X ones as doing so would introduce a serious Heath and Safety issue, Y capacitors MUST fail open circuit whereas X ones do not have to do so.G Edmonds

author: Swainster
author_rank: Frequent Contributor
timestamp: February 19, 2024, 09:24:49 am
content: RIFAs are particularly resistant to surge events so do have at least one redeeming feature, and they are still available new. If the replacement lasts as long as the original RIFA then I wont complain too much. However, if you are not replacing like for like then you cannot swap a Y2 cap for an X2 (though some caps are rated for both X and Y usage). You can use a Y1 in place of your existing Y2 cap (but not necessarily the other way around).When I did this job on a e3631A (and some of it's older relatives), I mostly went with RIFAs again, except where the output was also filtered by RIFAs (HP 6623A), which I replaced with a mix of RIFAs and polypropylene.

author: C-47
author_rank: Regular Contributor
timestamp: February 19, 2024, 12:07:14 pm
content: Thanks to all for the input and link, most useful, now the search begins for the correct capacitors, where they don't charge $30 shipping on a $3 item. Thanks

author: C-47
author_rank: Regular Contributor
timestamp: February 26, 2024, 01:51:53 am
content: Convoluted Travel Route:Ordered the correct capacitors from Mouser as they had reasonable shipping cost, but the route they took to reach Australia makes one wonder about "going green". Items departed Dallas - Louisville - Dubai - Shenzhen - Singapore - Perth, don't even want to think of the carbon footprint for moving a couple of grams. Plenty of direct flights from the USA to Oz, other than that, service and tracking all good.
Agilent E364X maintenance PSA! - Page 1
Forum section: electronics / repair

author: nexus
author_rank: Regular Contributor
timestamp: January 06, 2021, 03:40:44 am
content: Hi everyone,Was in the middle of this project and thought I'd share a concerning discovery. I am recapping (among other things) a 2006 model year E3648A, and I noticed that all of the mains X/Y film caps are the dreaded transparent RIFAs! They are located right next to the honking mains power switch on the large power pcb.I know that these style Agilent/Keysight power supplies (E363X/364X) are popular on the used market, so just wanted to point this out. If you plan on doing any service, it might not be a bad idea to at least inspect if not just replace these caps! I haven't combed digikey for parts yet but I'm sure suitable replacements can be easily found.
Agilent E4402B Schematics-Can anyone share? - Page 1
Forum section: electronics / repair

author: djsb
author_rank: Super Contributor
timestamp: May 09, 2019, 07:30:02 pm
content: I'm trying to figure out why there is amplitude bounce on the 10Mhz reference output connector of an Agilent E4402B spectrum Analyser at work. The output has suddenly started to work properly and the frequency is bang on 10Mhz. Can anyone share any schematics? Thanks.
Agilent E4402B Spectrum Analyzer Keypad Issue- Need Help - Updated Solved - Page 1
Forum section: electronics / repair

author: RecursiveLogic
author_rank: Newbie
timestamp: July 21, 2020, 05:56:22 pm
content: Hi All... I'm new to the blog, and this is my first post. I recently acquired an Agilent E4402B Spectrum Analyzer. I am running version HP A.03.03 firmware, and I am unable to ESC out of the startup splash screen. I can only press the green preset key, which briefly changes the center channel from 1.5GHz to 750MHz, showing quick * next to the center channel next to the Frequency Menu. I am able to introduce a 10MHz signal, which shows up on the very left side of the screen and does vary based on power. I've examined the boards, and looked for potential issues, even thought I do believe this is a programmatic lockout. I've tried the System/Local key, and other keys with no visible indication of button push. No menus change, no action appears to happen, with the only exception is the preset key, as I stated above. Even the On and Standby buttons do not function in the current state. Finally, I see no indication of error outside of an expected message "System, Alignments, Align Now, All required" message.Update: I've since attempted a firmware update, loading disk one, the unit stayed in white screen until the disk finished. I was unable to make a keypad entry on disk switch, and am now believing I have a bad A4 board (no blinking light, DS7, and DS13 remain lit) after troubleshooting for several hours. It is an early serial number unit.Update 7/22/2020 - 08:05AM EST: As I've continued to troubleshoot, I decided to reformat and copy firmware files from disk 1 over to a new disk, and ironically, this has worked to resolve errors on the A4 board, and display. I am now prompted to continue installing the firmware. Unfortunately, the keypad is still unresponsive. Since I am no electronics expert, I am learning as I am going. Having access to the service guide, I decided to check voltages on the probe pins, which are defined in the guide. The positive voltage pin 1 (right corner under RT2) is approximately 14.98v, supposed to be 15v, and the negative side, pin 2, is -3.42v, and is supposed to be -12.6v, so I believe I have an issue with the negative power in the panel, but do not have a schematic to troubleshoot further. I am including an image of the area I tested, and will continue troubleshooting.Update 8/5/2020 - 10:08PM EST: Upon continued inspection, I identified a bug... quite literally a bug on the board to board cable connector/connector (see pictures). The bug appeared to be burned, and I believe was causing a short between the cable and the AA3348 Raw Board somehow.Update 8/6/2020 - 12:17AM EST: Just updated the firmware to A.7.06, and doing alignments. I have larger memory, but was having problems updating to A.14.06 disk 3, so will get back to it tomorrow.
Agilent E4438C Service Software - Model from driver issue - Page 1
Forum section: electronics / repair

author: Tony_G
author_rank: Super Contributor
timestamp: January 13, 2023, 09:22:03 pm
content: Hey All,Wondering if anyone has gotten this running? I have a Win 7 x86 VM setup with IO Libraries Suite running - I can connect to the E4438C via GPIB and to an IDN - When I try running the service software and provide the information to the app I get an error dialog showing "Could not retrieve model from driver":Any suggestions on what I might be doing wrong or missing?Thanks,TonyG

author: Tony_G
author_rank: Super Contributor
timestamp: January 19, 2023, 05:15:17 pm
content: Was chatting with a guy from Keysight and he suggested changing the SICL address from the default "gpib0" to "hpib7" - That solved the problem:Service software now running.TonyG
Agilent E5061 won’t boot - Page 1
Forum section: electronics / repair

author: komradebob
author_rank: Contributor
timestamp: May 26, 2021, 03:01:10 pm
content: Oh great and wise ones,I recently acquired anE5061a etwork analyzer that will not boot. It seems to be stuck in a loop where it shows me the bios message, blanks the screen, sits for a minute, and then comes back to the bios. I can boot from a floppy disk and look at the hard disk image without error. So I’m fairly convinced the disc is otherwise fine but some critical part of the windows image is corrupted.The short version of this is that I think I need to reinstall windows 2000 and the operating software for the analyzer. Is there anywhere I can get a replacement hard disk with all this pre-loaded, an image I can do onto a bare drive, or the floppies required to do an install.
Agilent E5062A RF network analyzer fail - Page 1
Forum section: electronics / repair

author: Starpoint
author_rank: Newbie
timestamp: April 03, 2025, 10:48:39 am
content: My old Agilent E5062A network analyzer gives an error when using the test program.What is noticeable is that the power on test does not give an error.When using the test program the analyzer indicates that both The A1 and the A2 board fail (internal level monitor test and the DC bus test).Is seems to me that it is impossible that both boards have a defect so the problem must occur on both boards.You don,t notice anything about the analyzer, everything is correct and the device functions fine.Does any idea where I should start looking?

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: April 03, 2025, 08:01:52 pm
content: Hello Starpoint,According to the self test results, I would start having a look to the power supply.Check each power rail for adequate voltage and ripple level.Maybe something is a bit off specs but still not too bad to brick the whole TE.

author: Starpoint
author_rank: Newbie
timestamp: April 06, 2025, 08:40:57 pm
content: The solution was simple.I did a system recovery and the error message was gone.
Agilent E8257C 20 GHz microwave analog signal generator repair - Page 1
Forum section: electronics / repair

author: nexus
author_rank: Regular Contributor
timestamp: August 24, 2023, 02:27:57 pm
content: Hi all,I recently repaired an Agilent E8257C signal generator. It had some unique self-test errors that I had not encountered before in my experience working on PSG's, so I attempted to troubleshoot systematically first in order to isolate the problem areas. Turns out the repair required both hardware and software, but unit was fully restored and passed calibration.Here is the video:Enjoy!
Agilent E8357a Network Analyzer " Agilent Technologies DSP Driver #2 " Search - Page 1
Forum section: electronics / repair

author: Johnny10
author_rank: Frequent Contributor
timestamp: April 30, 2025, 05:25:49 pm
content: Agilent E8357a Network Analyzer " Agilent Technologies DSP Driver #2 " SearchI'm looking for missing software and drivers for my Agilent E8357a Network Analyzer.The DSP driver #2 is missing and I am missing the Serial Bus Test.My unit is running Win XP with 500MHz CPU upgrade

author: Miek
author_rank: Regular Contributor
timestamp: May 01, 2025, 05:58:00 pm
content: I think that bit of the service manual is just out of date. My working unit doesn't have that driver either, instead it comes up as "Agilent PNA DSP Devices/Agilent Technologies DSP-AM"

author: Miek
author_rank: Regular Contributor
timestamp: May 01, 2025, 08:08:21 pm
content: That's what it should show up as in Device Manager. The file itself should be at C:\WINNT\system32\drivers\spampnp.sys

author: Johnny10
author_rank: Frequent Contributor
timestamp: May 01, 2025, 08:27:16 pm
content: Yes.. Found it, Same version as yours.As I go further into Troubleshooting. I find a problem checking the A10 Phase Lock Reference OutputBand 0 . Setting the Network Analyzer CW Frequency at 9.9MHz I'm supposed to get 9.9MHZ on W39 of A10 board.I get a very low reading at 9.25 MHzMeasuring the Band 1 through 6 I get exactly 1.0416 MHz with strong signal.
Agilent E8357a Network Analyzer Phase Lock Lost Problem - Page 1
Forum section: electronics / repair

author: Johnny10
author_rank: Frequent Contributor
timestamp: May 08, 2025, 11:23:53 pm
content: Agilent E8357a Network Analyzer Phase Lock Lost ProblemI've been working through the Service manual for this analyzer and thought maybe I would post some of the results here hoping for direction.Going through the Troubleshooting section there is a CW setting that you can use to find which frequencies are phase locked. I found that I have no band 0, 3, 5 and parts of other Bands.I can get working 80MHz - 450MHz and frequency groups of other bands. Have included table of frequencies.In other tests I have measured and found 10MHz and 5 MHz reference frequencies, Phase Lock Reference signals of 9.9MHz and 1.0416.I have 2nd LO on Board A10, 3.9998MHzA8 Fractional Board has signal 120MHz.A8 Fractional Board Bands 2 - 6 Output is present.Voltage I have -12.3, 14.59, 5.04The Serial Bus Test will run only to Node 8 then stops because of Phase Lock Lost error.

author: marshmallow3141
author_rank: Newbie
timestamp: August 26, 2025, 09:04:06 pm
content: I have the exact same problem on my network analyzer as well. Were you ever able to solve the problem? I suspect it is due to a faulty A16 test motherboard or the A21 SOMA50. My spectrum has various gaps(7.7-10GHz, 15.4-20GHz, 24-30GHz, 46-60GHz) where the signal drops to the noise floor so I'm fairly confident that this is a source issue.

author: Johnny10
author_rank: Frequent Contributor
timestamp: August 28, 2025, 11:21:34 pm
content: After running the Serial Bus test, (I had to record it with my phone on Slo-Motion to catch all the results) I traced it to the A-8 board. If you notice on the block diagram A-8 Fractional board has switching for Band 0,3, and 5. My main problem frequencies. The test voltages came out wrong. I put it away for the time being until I can get a working A-8 board. However, A couple of days ago I found the A-8 board had been repaired before and had some new transistors installed. I found them to test OK so I re-soldered various spots across the board. I'm testing it again this weekend to see if anything has changed.

author: Johnny10
author_rank: Frequent Contributor
timestamp: August 30, 2025, 11:30:39 pm
content: Just ran the serial bus test after re-soldering previously replaced transistors. And low and behold the Serial Bus Test ran to completion for the first time ever!I'll do more testing now that I have seen a positive change to results. Still Phase Lock Lost dialog appears.My problems definitely with Fractional N board.

author: marshmallow3141
author_rank: Newbie
timestamp: September 01, 2025, 06:36:18 pm
content: Thanks for the info! My model is the e8361a so the schematic is a little different but I'll check out the A8 board and see if I can resolve the problem in a similar way.
Agilent E8357a Network Analyzer Serial Bus Test ( Solved ) - Page 1
Forum section: electronics / repair

author: Johnny10
author_rank: Frequent Contributor
timestamp: April 28, 2025, 12:41:12 am
content: Agilent E8357a Network Analyzer Serial Bus TestI recently purchased this analyzer with Phase Lock Lost error. In the Service manual they describe a Serial Bus Test as part of troubleshooting routine. Problem is I can't find it anywhere in the Service Diagnostics.I realize this is a well covered Network Analyzer but does anyone know why it would be missing?This unit has an upgraded CPU Board and Windows XP OS.I do have the E8356 - E8358 Service Manual. Following Measurement System Troubleshooting Section.First Pic from my Service MenuSecond Pic from Help Menu showing where it should be.

author: Johnny10
author_rank: Frequent Contributor
timestamp: April 30, 2025, 01:10:02 am
content: I'm wondering if The Serial Bus Test is only in the Windows 2000 and 266MHz CPU version ?

author: Miek
author_rank: Regular Contributor
timestamp: April 30, 2025, 08:45:43 am
content: I don't see the menu option either, but you can still find the application at C:\Program Files\Agilent\Network Analyzer\Service\sbtest.exe

author: Johnny10
author_rank: Frequent Contributor
timestamp: April 30, 2025, 11:07:19 pm
content: Thank you,I found the test inside the program files. But didn't help much, the application quits functioning because of phase lock lost?I'll keep working on it.This actually first network analyzer I've worked on, I have been out of the hobby for a couple of years because of losing the house during hurricanes here in Florida.
Agilent E8357A VNA 3.8 GHz PMYO phase noise - Page 1
Forum section: electronics / repair

author: busaboy
author_rank: Contributor
timestamp: June 07, 2021, 05:52:21 pm
content: I'm trying to confirm what the spectrum of the 3.8 GHz PMYO in my VNA should look like. It is measured looking at the leakage at Port 1. Signal level is approx. -70 dBm. The oscillator is not phase locked and phase noise and frequency stability look pretty bad.I was having multiple errors that went away once I re-seated all the boards multiple times. When I went to adjust the 3.8 GHz PMYO I saw the poor phase noise and frequency stability. The VNA does pass self test however. I'm trying to figure out if this is a problem.

author: busaboy
author_rank: Contributor
timestamp: June 07, 2021, 05:53:55 pm
content: Top view of VNA and self test results. I previously had 5 errors include loss of lock.
Agilent e835Xa Hard Drive Replacement. - Page 1
Forum section: electronics / repair

author: bwussler
author_rank: Newbie
timestamp: September 08, 2024, 04:06:15 am
content: Hi folks,Just acquired a pretty beat up Agilent e8358a and unfortunately found out it is missing the hard drive containing the operating system. Wondering if anyone has a copy of the Windows 2000 or XP image that I could use to bring my unit back to life. The CPU board is using the 266MHz processor. Any help or advice is much appreciated.Thanks,Bailey
Agilent ENA E5071B repair help: Replaced motherboard, turns on and then off - Page 1
Forum section: electronics / repair

author: spicytofu
author_rank: Contributor
timestamp: April 29, 2023, 02:53:58 am
content: The unit only had a bad motherboard, which I replaced. Installed windows xp and all the drivers (CHIPS video and agilent control board). I did all this without powering up the E5071 by bypassing the ATX power and directly powering the board and HDD using a separate ATX power supply. Everything is working fine and I was ready to connect back the original ATX power connector from the E5071. The unit turns on for about 3 seconds. All fans work, CPU fan runs, HDD is on. But then everything just turns off and I have to cycle the front panel power switch to repeat the process.Before I replaced the original motherboard, the unit turns on and produces no video. It stays running with a blank screen. Since I was able to use the original PCI CHIPS video card, it was confimed that the original motherboard went bad. There are no other power wires to the board other than a 20 pin ATX cable that comes from another board inside the E5071 unit (not directly from the ATX power supply). My guess is the power circuity controls everything, including supplying power to the motherboard. Even with the unit off, some parts of the unit remain energized, like the OCXO.Im thinking it has to do with the motherboard and the agilent PCI hardware controller. Some "stay-on" signal isnt passing through. Any ideas would be appreciated.

author: m k
author_rank: Super Contributor
timestamp: May 06, 2023, 03:55:54 pm
content: Some tower computers boot up like then after mains are lost, ACPI something I guess.Maybe your new motherboard has a different setting somewhere.

author: UT4UBL
author_rank: Newbie
timestamp: June 08, 2025, 07:38:26 pm
content: This problem may occur after resetting the BIOS. For example, after replacing the battery. The default BIOS settings are different from the working ones. Check the power settings in the BIOS. In the photo are my workers for E5071B in the version without a hatch on top of the case.
Agilent ESA unable to load power suite - Page 1
Forum section: electronics / repair

author: veedub565
author_rank: Frequent Contributor
timestamp: January 20, 2022, 02:58:16 pm
content: I successfully completed the option B72 memory upgrade and installed the latest firmware for my E4411B analyser. All went well until it asked for the power suite install disk. It reads the disk ok, but then throws an error"Failed to load DLP a:install.o"It should load fine, so I'm a bit stumped here as to why it won't. I can find no reference to this error. Except in a manual for the E4402Bhttps://maximinstruments.com/pdf_files/AGILENT_E4402B_GSM_EDGE_Guide.pdf"If the error message “Failed to load DLP a:install.o” appears,ignore this message; the message indicates that the installer wasnot exited properly. Press the Mode key. If GSM (w/EDGE) nowappears on one of the softkeys, the installation was successful"So I'm wondering if a similar thing is happening here for some reason**UPDATE**Weirdly I have been able to install an old version of powersuite utility, the one that is only on 1 disk instead of 3. It installed straight off, no problem at all. How very weird that the latest version won't install.

author: m k
author_rank: Super Contributor
timestamp: January 21, 2022, 04:48:04 pm
content: Is that file in disk1 only?Back in the day some install scripts were not very sophisticated.If you can make doubles you can also add some extras.Maybe just adding missing file and see what happens.
Agilent ESG (4433B) component ID - Page 1
Forum section: electronics / repair

author: dhillman
author_rank: Contributor
timestamp: January 13, 2017, 02:13:25 am
content: Hello All,I acquired an E4433B knowing that it would be an easy fix with a shorted SHF0189 in the output stage.Sure enough there was a dead unit before the filters, that upon replacement allowed correct output.The odd part is, this ESG was reworked in 2002 by Agilent where the final amplifier was changed. It has the characteristic coloured dots, so I assume it was Agilent. Poorly soldered mind you!The (H1) SHF0189 was failed - Red dots.The (M11X) was working - Blue dot.Does anyone know the identity of the M11X?

author: kjk24
author_rank: Regular Contributor
timestamp: December 30, 2017, 08:06:26 am
content: Hi, have you a foto of the hole board, I have a board on my desk from a similar unit , may be I have such a transistor

author: thorswait
author_rank: Contributor
timestamp: March 08, 2019, 02:13:22 am
content: Hi I know this topic's been out there for a long time, but I'll take a guess.Is anybody able to tell me what are the cap and resistor value on the H1 red dot amplifier that are doing some sort of counter reaction feedback ? I have a problem with a unit that has the M11X blue dot (which I'm unable to figure out what is that part the datasheet etc.) and I want to replace that defective one with SHF-0189 that I have in hand in order to repair this unit.Thanks for your time,

author: madao
author_rank: Frequent Contributor
timestamp: May 25, 2025, 03:17:33 pm
content: M11x1005 is produced by Watkins Johnson, but this Info doesn't help much. Only: i believe: 1W type.Getting of M11x1005 is impossible. I have replaced him by SHF-0289 and it works, but frequency response doesn't match (+-2db difference by ALC OFF) on my E4438C signalgenerator.
Agilent ESG E4438C HDD Failure and replacement. Does not boot with CF/SSD disks - Page 1
Forum section: electronics / repair

author: eb4fbz
author_rank: Regular Contributor
timestamp: July 08, 2021, 05:35:51 pm
content: My Agilent ESG E4438C generator failed one month ago due to a hard drive failure. Fortunatelly, the HDD only stores configuration and custom waveforms. Unfortunatelly i had some high value waveforms and no way to recreate them easily.Original HDD was IBM Travelstar 10,05gb IC25N010ATDA04-0. I have tried to replace with an industrial 16GB CF card and IDE adapter, but it hangs just at the end of "Verifying NRAM". Same result using a Trascend PDS330 32GB IDE SSD.I have an old, but still working, 40GB HDD i just retired from a Tektronix RTSA (i have learned the lesson). Just after finishing the NRAM verification process, it has formatted the HDD and booted correctly. So:Why does Agilent ESG refuses to work with solid state disks?Everyone using instrumentation with HDD's, please make a backup before disaster strikes. Most equipment stores the boot parameters, OS, personality and even the calibration on that old hard drive!
Agilent FieldFox N9912A 4GHz Handheld RF Analyzer Repair & Teardown - Page 1
Forum section: electronics / repair

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 30, 2024, 06:03:59 pm
content: In this episode Shahriar repairs an Agilent N9912A which flags several error messages after bootup. The instrument reports hardware time-outs and occasionally ADC clock source unlock condition. The second error is much more useful in debugging the unit.The block diagram of the instrument is presented and several potential failures anticipated.The teardown of the unit and analysis is also presented. After some troubleshooting, it becomes clear that the primary 30MHz TCXO has a broken internal connection. The unit is disassembled and new pins installed. After putting the TCXO back into the unit, the instrument return to full functionality. A few quick experiments verify that the FieldFox performs both CAT and SA modes correctly.Please consider supporting The Signal Path:https://www.TheSignalPath.com/Donatehttps://www.Patreon.com/TheSignalPathYou can watch the video here: [17 Minutes]youtu.be/7vg0u5SEEls
Agilent / HP 53131A part information sought. - Page 1
Forum section: electronics / repair

author: Paceguy
author_rank: Regular Contributor
timestamp: September 03, 2025, 11:59:29 am
content: I would like to purchase replacement BNC input connectors for my Agilent 53131A counter from Digikey. Would anyone know the part number that I should order?

author: Kwakerman
author_rank: Regular Contributor
timestamp: September 03, 2025, 05:26:28 pm
content: The service manual lists these options for all 5 BNC connectorsAMPHENOL. 31-5506TYCO ELECTRONICS AMP. 5227677-1Not looked to see if DK stock them but if they don't then just google for the data sheets, get the dimensions / specs and see what matches DK / Mouser or whoever.

author: Paceguy
author_rank: Regular Contributor
timestamp: September 04, 2025, 12:31:58 am
content: Thank You Kwakerman, yes that's what I'm looking for. I don't have the service manual for mine and I did't want to order the wrong part, thanks again for helping me out, much appreciated.

author: Kwakerman
author_rank: Regular Contributor
timestamp: September 04, 2025, 07:43:48 am
content: KO4BB website has pretty well all the manuals for these counters.
Agilent Infiniium DCA 86100C HDD image request - Page 1
Forum section: electronics / repair

author: ARF
author_rank: Regular Contributor
timestamp: February 09, 2024, 03:34:21 pm
content: Can someone share the HDD image for the 86100C?I'd like to try running this on my 86100A, I'm guessing the drivers won't install, but I'm still interested.Thanks!

author: ARF
author_rank: Regular Contributor
timestamp: February 27, 2024, 09:36:38 am
content: looks like it's quite rare...

author: ARF
author_rank: Regular Contributor
timestamp: April 25, 2024, 09:37:45 am
content: I'm still looking...

author: ARF
author_rank: Regular Contributor
timestamp: May 19, 2024, 02:07:31 pm
content: I'm still looking...

author: ARF
author_rank: Regular Contributor
timestamp: August 22, 2024, 12:13:58 am
content: I'm still looking...

author: ARF
author_rank: Regular Contributor
timestamp: September 22, 2024, 08:52:42 pm
content: I'm still looking...

author: simba15
author_rank: Regular Contributor
timestamp: September 23, 2024, 03:43:14 pm
content: if its not here you might try herehttps://groups.io/g/HP-Agilent-Keysight-equipmentseems quite rare and specialized so would be odd to see in someones garage.

author: ARF
author_rank: Regular Contributor
timestamp: January 17, 2025, 08:31:56 pm
content: I'm still looking...
Agilent Infiniium MSO8104A need help - Solved - Page 1
Forum section: electronics / repair

author: Mike112
author_rank: Newbie
timestamp: May 24, 2019, 01:42:34 pm
content: Hi, I was recently given an agilent infiniium MSO8104A scope that is having some issues. When the scope powers up all of the front leds and fans come on and that is about it. The screen stays off and the unit constantly beeps about every 3 seconds. I think its getting stuck passing POST? I have checked the power supply and everything seems to be normal except the post labeled +/- 12.5 have +/-12.1 respectively, I think that is normal? Is this scope worth spending some time on or is it gone?Thank you!Fixed: After reseating RAM and CPU scope turned on but gave errors, see below. Updated the drivers, IVI shared components and IO library. One of them failed to install but upon trying to install a second time worked just fine. Restarted scope and still had the same errors. Updated to the newest version of Infiniium, also failed to install the first time, worked the second time trying to install. Newest version of Infiniium took away both errors, scope is up and working great now.

author: dzseki
author_rank: Frequent Contributor
timestamp: May 24, 2019, 03:20:31 pm
content: The beeps you noted are often the sign for problem with the RAM on the motherboard, try to reseat them.

author: Mike112
author_rank: Newbie
timestamp: May 30, 2019, 02:59:13 pm
content: UpdateThanks! I pulled the ram and reseated them, seems to do the trick. The scope started up with out a problem after that but is giving two new errors once in windows."The scope vxd is not registered or is out of date" and "Can't register application with acquisition interface board" given by the Infiniium app.I am thinking this is driver related and could just need an update of the software? Maybe something got unplugged? I also noticed that some of the LEDs are not lit on the front of the panel, others stay lit constantly while the scope is on and wont turn off. The scope would immediately fail a self test and crash infiniium. From what I could tell every knob was working. Could this just be software related?
Agilent infiniium oscilloscope option ID corruption issue - Page 1
Forum section: electronics / repair

author: super_electron
author_rank: Contributor
timestamp: March 01, 2023, 12:20:34 am
content: Does anyone know where the option ID is stored on Agilent infinitum 54855a oscilloscope ? I replaced one of the bad PCI card and after rebooting it seems like option ID got corrupted. Anyway to fix it ? In the picture that is the actual ID being shown by the scope after boot up.
Agilent Infinium 54832B no dispaly - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: January 11, 2022, 10:31:38 am
content: helloUnit did not power on. no fans working.Fault was traced to a defective TOP223Y Ic in the power supply side board and an open 10ohms MOX resistorAfter replacing unit powers on and shuts down after a minute . repeated power on cycles from the front panel power on key results in unit powering on and fans running a constant speed. no display though. Once it starts stays it remains on .no display when the power on soft key is depressed the unit powers off. when the mains is switched off again the fan rpm increases before shutting down.ALl the lv supplies ok. 3.3, 5v -5 and 12 vthinking of connecting an external monitor and replacing the CR2032 batteryRegardsAnand

author: max-bit
author_rank: Frequent Contributor
timestamp: January 11, 2022, 11:00:30 am
content: If the power supply is functional. (all voltage OK)1. Reset the bios2. Check the motherboard. (remove all expansion cards beforehand)

author: hitecelec
author_rank: Regular Contributor
timestamp: January 11, 2022, 11:07:46 am
content: HelloOk. will just try and revertPowersupply works only when the 5 pin inhibit connector is removed.otherwise it needs a few cycles of soft key power up depressions to turn and remain in the on conditionRegardsAnand
Agilent Keysight 3034a X-Series does not show traces - Page 1
Forum section: electronics / repair

author: Machlee
author_rank: Contributor
timestamp: July 03, 2024, 04:18:12 am
content: Hi.I was unlucky enough to break the oscilloscope when I tried to unsolder the battery. After this operation, when turned on, everything worked except for the presence of traces. Or sometimes they appear but very nosy.

author: TheSteve
author_rank: Unknown
timestamp: July 03, 2024, 05:38:58 pm
content: Ouch, was the board flexed a bunch when you were working on it?

author: Machlee
author_rank: Contributor
timestamp: July 04, 2024, 02:09:58 am
content: Surely, the battery terminals were difficult to remove, and my friend had to make an effort by prying the battery up with a screwdriver.

author: JacobPilsen
author_rank: Regular Contributor
timestamp: July 24, 2024, 10:29:17 am
content: I think he is not your friend anymore.Low temperature desoldering alloy (like InBiSn or BiInPbSn) should be your friend...On the other hand, it is possible that the real fault is located at the opposite end of the board.There may be a faulty U700, or a damaged DC/DC.Have you tried to see if the signal that passed through the AFE (analog front-end) is undamaged?There are lanes between the AFE and U700, and there are terminating resistors at the start and end where the signal can be observed with a second oscilloscope.
Agilent Keysight 3034a X-Series Oscilloscope Repair - Page 1
Forum section: electronics / repair

author: salvagedcircuitry
author_rank: Regular Contributor
timestamp: March 17, 2020, 08:39:02 pm
content: Hey Guys! I made a repair video about fixing a faulty Agilent / Keysight 2000a/3000a x-series power supplyMassive thanks to my fellow eevblog members. This thread inspired me to create this video, as it seems that the 2000a/3000a oscilloscope power supplies have a few different failure modes.Relevant EEVblog forum thread:https://www.eevblog.com/forum/repair/dso-x-3024a-power-supply-defect/List of replacement parts:Datasheet for look-a-like lineage branded power supply. CCH125 series:http://apps.geindustrial.com/publibrary/checkout/CCH125?TNR=Data%20Sheets%7CCCH125%7CPDF&filename=CCH125.pdfGenuine Keysight PSU repair part: 0950-5277https://www.keysight.com/my/partDetail/0950-5277Keysight InfiniiVision 3000 X-Series Oscilloscope Firmware (latest)https://www.keysight.com/main/software.jspx?cc=US&lc=eng&ckey=2014548&nid=-32976.970765.02&id=2014548Original mosfet:https://www.digikey.com/product-detail/en/stmicroelectronics/STP12NM50/497-2666-5-ND/603691Replacement mosfet:https://www.digikey.com/product-detail/en/ixys/IXTP450P2/IXTP450P2-ND/2328313Two pin Diode package near mosfet:https://www.digikey.com/product-detail/en/on-semiconductor/MUR860G/MUR860GOS-ND/919926Current mode controller:https://www.digikey.com/product-detail/en/on-semiconductor/UC3842BVD1R2G/UC3842BVD1R2GOSCT-ND/5802572Replacement MOV:https://www.arrow.com/en/products/v300la20ap/littelfuseReplacement NTC Varistor:https://www.arrow.com/en/products/b57237s709m/epcos-tdkReplacement Fuse:https://www.digikey.com/product-detail/en/bel-fuse-inc/MRT-6-3AMMO/507-1119-1-ND/4794478Replacement 1w 22k resistor under main filter capacitor:https://www.arrow.com/en/products/erj-1tyj223u/panasonicPower supply retrofits:https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPS-300-12/7706051https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPS-400-12/7706061Will need ps_on inverted:https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPSG-160-12/7706116https://www.digikey.com/en/products/detail/murata-power-solutions-inc/PQC250-12/6873845Tall cap I selected:https://www.digikey.com/products/en?keywords=ucy2w101mhdDimensionally compatibile cap:https://www.digikey.com/product-detail/en/rubycon/450VXH100MEFCSN22X25/1189-2028-ND/3564971Let me know what you think!https://salvagedcircuitry.com/