hybridfree/eevblog-posts huggingface dataset:
HP 740B DC Standard Ultimate Restoration - Page 1
Forum section: electronics / testgear

author: Hewlett Me Out
author_rank: Newbie
timestamp: July 27, 2023, 12:51:34 am
content: Currently:But you need the backstory:Fresh out of the asylum with big ideas and money to burn on a Vishay metal foil addiction, I set out to calibrate my HP 3440A with whatever I could get my hands on first, dead or alive. That just happened to be a 740B with of course the 419A along with a 735A to calibrate the 740B. Now I'm not well or one to leave well enough alone and I don't subscribe to the "if it ain't broke" mentality in my mental state so it was sensible to completely rebuild this DC Standard and when the manual told me the oven wasn't serviceable, I took that personally and serviced it anyway. HP lied to you.With my oven fully Vishayed and the zener installed (not pictured), I was confident that the oven would be sufficient for my four digit needs.Then I thought to myself, how can my oven reach its full potential if my power supply and regulator for the oven & reference weren't fully Vishayed too?To be continued...

author: Vgkid
author_rank: Super Contributor
timestamp: July 27, 2023, 06:26:05 am
content: Looking forward to the updates.

author: Hewlett Me Out
author_rank: Newbie
timestamp: July 28, 2023, 02:45:35 pm
content: Before this thread is filled up with a lot of information that likely won't be needed for normal operation, here are a few tips that I think take some complex topics and simplifies them:-the heater/reference board is repairable, just do not try to use a dual NPN on the heater side of the board. It will not work properly. Additionally, if you take the board out, you should cut all of the wires close to the board and strip new leads. Good chance your wires are oxidized. That includes the ones for the thermistor. The white substance is just silicone sealant and easily detaches from the board. Apply new silicone in the same way when you reinstall the board. Mind your component heights and make sure you're not shorting anything with the interior of the oven.-while there is another thread on this DC Standard, the information seems to complicate a relatively simple repair process. Contrary to what that thread indicates, there are neons available for the choppers and they do work. I grabbed two C2As at random from a bag of 20 I had just yesterday and put them in the main loop. While the process for accessing the board holding the neon bulbs was a pain, this repair does not need to include an LED retrofit. This information would also apply to the 419A. Certainly possible you could get better results if you went through an aging and matching process on your neon bulbs, but it does not seem necessary when there are other probably more meaningful performance improvements to be had elsewhere...
Tektronic 2235 - Page 1
Forum section: electronics / testgear

author: Eduardo Millan
author_rank: Newbie
timestamp: July 28, 2023, 01:52:10 am
content: Tengo un 2235 al que se le averio el flayback. Se puede conseguir uno nuevo?

author: MathWizard
author_rank: Super Contributor
timestamp: July 28, 2023, 03:40:51 am
content: You have a damaged flyback transformer ? and can u get a new one ? I don't think these scopes are all that expensive, or they shouldn't be. Maybe (if you read English) it's worth it to get a 2nd one just for spare parts. I like these old analog scopes.
Rigol DP932E - Page 1
Forum section: electronics / testgear

author: flano
author_rank: Contributor
timestamp: July 28, 2023, 02:27:00 am
content: Hi,Anyone have experience with the DP932E power supply? Are you happy with? Any annoying interface issues or bugs?I have previously purchased a GPP-4323 that developed a fault where it would not boot intermittently. This was replaced with another unit which had the same problem new out the box. Both were sent back to GW Instek and were unable to be repaired. I have now been refunded and looking for a different option.DP932E with the HiRes option is available locally in Australia from Emona for $849 Ex.I see there are few posts about hacking it but not much other feedback.Thanks MikeVK4MWL
siglent 1104 with very pinkish screen  - Page 1
Forum section: electronics / testgear

author: mastershake
author_rank: Frequent Contributor
timestamp: July 28, 2023, 12:25:27 am
content: anyone seen this before. we got two in today and they have totally different screens in them. one is super matte nice and black with zero reflection the other is a matte screen but def much more reflective and all the greys and blacks have a pink hue to them. the yellow seems a bit more deep also. not so sunny yellow more leaning towards like a mustard yellow.anyone seen this before? both are within a few hundred serial #'s of each other both seem to work fine but im debating on returning the one with the pink hue to it. is this normal to get them in with different screens like this? i also have a much older one from like 3-4 years ago and that screen is MUCH brighter then either of these new ones even at max brightness on them.

author: tautech
author_rank: Super Contributor
timestamp: July 28, 2023, 12:54:17 am
content: Evidence pic ?

author: mastershake
author_rank: Frequent Contributor
timestamp: July 28, 2023, 02:20:17 am
content: ill try to get some tomm before i send it back. i decided to send it back they said they will send out another one. they agreed it shouldnt be that way. its not like its hot pink but there is def a pink hue to the whole screen. and the finish is totally different on this one. like i said its still matte but way shinier then the other one that one has basically no reflections at all this one has way more reflections then the other one. they are for sure different screens both brand new units.
Chroma 6106 Ac source - Page 1
Forum section: electronics / testgear

author: artag
author_rank: Super Contributor
timestamp: September 15, 2014, 10:33:24 am
content: I'm looking for user & programming informatipon for a Chroma 6106 AC source (or the related 6110, 6120).I've found an NI driver and may be able to guess some commands from the contents of that, but I don't have the NI suite (or an NI GPIB adapter) so can't run it properly.

author: DanielS
author_rank: Frequent Contributor
timestamp: September 15, 2014, 10:47:39 am
content: Ask Chroma?I had no trouble getting all the user manuals and other information I wanted while I was fishing for quotes to get an idea of the cost of setting up a proper power supply testing lab.

author: TiN
author_rank: Super Contributor
timestamp: September 15, 2014, 12:39:15 pm
content: I had LabView examples and something similar for 61504, if it's compatible, i can check later.

author: artag
author_rank: Super Contributor
timestamp: September 15, 2014, 11:41:53 pm
content: I did ask Chroma, but got no reply. Previous comments here seem to indicate they don't like to give out much.

author: PTR_1275
author_rank: Frequent Contributor
timestamp: December 07, 2015, 11:47:00 pm
content: I know it is a very old thread, but did you end up getting the manual? I sent Chroma an e-mail asking for a copy of the user manual for a 6512 AC source and got an e-mail a few days later from the Australian distributor with the manual. It gives me a local point to get parts from if ever I need them too.If you didn't have any luck, I can send a copy of the 6512 manual, the commands might be similar

author: mr.os
author_rank: Contributor
timestamp: July 27, 2023, 05:35:31 am
content: It's an old topic, but I have the same problem.Did someone has the manual for the Chroma 6106 AC source? I asked Chroma (they where really responsive and friendly) but they didn't find it either. They only send me the manual for a complete test system that didn't help.Best regardsAndreas
Rigol 1054Z at 200MHz? - Page 1
Forum section: electronics / testgear

author: Artur
author_rank: Newbie
timestamp: July 26, 2023, 03:47:24 pm
content: I saw a video24:40 recently where author says he's using a 200MHz scope while showing screen of 1054Z. Only hack I'm aware of is 100MHz one. Is there another hack to bring this scope to 200MHz? I know, front end might not go this high but perhaps it can.

author: mwb1100
author_rank: Frequent Contributor
timestamp: July 26, 2023, 03:55:46 pm
content: He just misspoke.

author: tv84
author_rank: Super Contributor
timestamp: July 26, 2023, 04:30:12 pm
content: Quote from: Artur on July 26, 2023, 03:47:24 pmDon't go that road!
Which Tektronix model is this? (spectrum analyzer photos) - Page 1
Forum section: electronics / testgear

author: nixxon
author_rank: Frequent Contributor
timestamp: July 26, 2023, 10:29:12 am
content: I am thinking of buying a legacy Tektronix spectrum analyzer that is for sale. The seller informs that he knows nothing about the item. Before buying this I would like to check out the frequency span and if the unit has a tracking generator installed. Does anyone recognize the instrument on the pictures? The model sticker on the unit seems to be missing. If you know the model, please let me know what model you think it is.

author: nixxon
author_rank: Frequent Contributor
timestamp: July 26, 2023, 10:35:40 am
content: It looks very much like this one:https://w140.com/tekwiki/wiki/2710I have never used a spectrum analyzer. Would I need a separate tracking generator if the unit is the 2710?

author: srb1954
author_rank: Super Contributor
timestamp: July 26, 2023, 11:04:36 am
content: Quote from: nixxon on July 26, 2023, 10:35:40 amIt is not essential to have a tracking generator for general spectrum analyzer usage but it is a useful function to have for measuring circuit performance of amplifiers, filters etc.It looks like this unit it has the tracking generator option (Opt 04) installed as it has the connector for this on the front panel.

author: nixxon
author_rank: Frequent Contributor
timestamp: July 26, 2023, 11:07:05 am
content: After reading another thread, here are some common issues with the 2710:Programmable logic devices which do failBurnt out front ends and couldn't detect a signalOther front-end issues that cant be repairedInconsistent amplitude results on the screen,PLL going out of lock,freezes,lack of response to front panel inputs,SLOW response to user inputetc etc(copied fromhttps://www.eevblog.com/forum/testgear/what-do-you-guys-think-about-these-spectrum-analyzers/)
UNI-T UT8803N USB Interface?? - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: July 05, 2022, 01:03:30 pm
content: Has anyone on here been successful with the USB Interface of the Uni-T UT8803?For me, it seems to install a generic "Universal Test and Measurement" driver and will not allow the driver suggested by the UTI-T programmer's manual. After a lot of screwing around, I could NOT see my Siglent USB gear and went back to an older restore point to fix that.By "see" i mean in the Keysight Connection Expert software that easily sees all my USB and GPIB gear.I liked the 8803N because of the large display and also as a side of trying to use it as an A/D converter, more or less, its limited resolution is more than fine for what I attempted to use it for. For now, it is basically replacing a Fluke 37, which although cool, is just too old to be of much use (I was just using it as a Variac output monitor on the bench). The UNI-T will now assume that role but with a much nicer display. It would be nice to be able to get data from it through the USB port, but not necessary as I use an Agilent 34401 for that.

author: thephil
author_rank: Regular Contributor
timestamp: July 29, 2023, 06:30:16 pm
content: I know it's been a year since you asked that question but I'd like to answer for future reference.The UT8803 (N/E) does not have SCPI capabilities. That is probably the reason why it doesn't show up in Keysight Connection Expert.However, the device has a usb interface that uses a proprietary protocol. I own a UT8803E and have reverse engineered the protocol and written a program to talk to it. You can find it here:https://github.com/philpagel/ut8803e
ERASynth Micro - Page 1
Forum section: electronics / testgear

author: johnh
author_rank: Regular Contributor
timestamp: July 25, 2023, 04:11:10 am
content: Is erainstruments.com still manufacturing?I tried to use the contact info to ask about ERASynth Micro. But, it responded with "unable to send"

author: thm_w
author_rank: Super Contributor
timestamp: July 25, 2023, 11:25:38 pm
content: Doesn't look like its available anywhere (crowdsupply or others).https://octopart.com/search?q=ERASYNTH&currency=USD&specs=0Their last activity is 2021 here:https://github.com/erainstrumentsThere is an email address there not sure if that is the one you tried or the contact form.
Keysight 3000T Factory Calibration Failed - Page 1
Forum section: electronics / testgear

author: ElectronMan
author_rank: Regular Contributor
timestamp: July 25, 2023, 01:42:10 am
content: A while back during some firmware shenanigans with my 3034T (yeah, I know), the firmware nuked my front-panel chip (The little Renesas chip on that circuit board).I was able to replace the chip with a new one, but didn't have time to put it back together for a while.Recently I dusted it off, finished the repair, and the front panel is working again. Unfortunately, the calibration wasn't being loaded and I determined that there was a corrupt flash block that was causing \Secure to keep getting recreated.I was finally able to erase that flash block via JTAG (it was already zeroed out, so no additional data loss) and now \Secure is back and working. However, I no longer have any valid calibration data files.I found some backups I took a long time ago, but they do not appear to be valid (note the small size, they are mostly zeros):06/14/24 08:22a 708 FactoryCal0.dat06/14/24 08:22a 704 ServiceCal0.dat06/14/24 08:22a 27872 UserCal16.dat06/14/24 08:22a 76 SERNUM.DATThe scope also still reports the factory calibration failed, and as a result, I cannot do a user calibration.Before I dig in further, I wanted to see if anyone has run into this issue previously. I don't need a precise calibration, for anything I do, but would like to get these errors cleared and be able to user-cal again.

author: ElectronMan
author_rank: Regular Contributor
timestamp: July 25, 2023, 05:51:54 am
content: UPDATE:I managed to find the CAL files in a raw NAND dump and restore them to their proper places.Now I just have to figure out the broken device web page, and the “Firmware is incomplete” message on boot up.There appears to be other files missing from \Secure on the scope that aren’t getting replaced by the firmware updates.
Pragmatic 3511A Waveform Generator - Manual Request - Page 1
Forum section: electronics / testgear

author: Dave_CA
author_rank: Newbie
timestamp: July 25, 2023, 03:14:39 am
content: Hello,I am looking for a manual for the Pragmatic 3511A. i have searched the inter webs and at least 10 manual supply websites and have not found anything. Pragmatic was based in San Diego CA and made some nice instrumentation. They were bought by (or sold to) TEGAM around 2005 or so. I have contacted TEGAM, but they are not able to help.I am hoping someone on here might be able to help.Thanks,Dave
Fluke 289 Complete set of Battery Contacts Needed - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: July 21, 2023, 11:29:27 pm
content: My Fluke 289 needs to have the complete set (including the spiral spring contacts) replaced due to battery leakage. I looked on eBay but no one has a complete set of the correct ones. Plenty for the 189 but none that I could find for the 289. If I could find a reasonable source for a complete battery holder/cover I might consider that but all I need are the contacts.Thanks,SamW3OHM

author: BeBuLamar
author_rank: Super Contributor
timestamp: July 22, 2023, 12:42:56 am
content: One of our 287 had a broken spring in the battery holder. I sent it to Fluke and they replace the entire holder for free. If you can't get Fluke to fix it under warranty perhaps you can buy this.https://www.jensentools.com/product/32653-1-FLUKE-28X-2019

author: scopeman
author_rank: Frequent Contributor
timestamp: July 24, 2023, 07:13:21 pm
content: Thank you so much for the response. I really appreciate that!I decided not to screw with trying to fix the corroded contacts one and bought the one you gave me the link to. The cost is only a few percent of the cost of a new instrument. Fortunately all of the damage was contained within the battery holder itself.From now on this instrument will have Energizer Ultimate Lithium batteries used in it as I have never found them to leak.I just wish that Fluke would have put an extra position on the range switch for power off/on. I really do not like instruments that are battery operated and have a soft power switch as the constant low current drain is what helps the batteries leak.....SamW3OHMP.S. No one else had that genuine Fluke part at a lower cost. I was given this meter when a plant tech was having an issue with it. I traded him for a simpler to use meter and I later fixed the Fluke 289 problem so I probably would not have been able to return it to Fluke anyway.
Datron 1065 1065A service manual - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: March 28, 2023, 05:33:20 pm
content: A friend has scanned his Datron 1065 1065A service manual. I have assembled the scans into a manual.It is located here:https://xdevs.com/doc/Datron/1065_1065A/

author: Gyro
author_rank: Super Contributor
timestamp: March 28, 2023, 07:08:21 pm
content: It would be worth uploading to KO4BB too, it appears to be one that is not yet included in the Datron collection (the similar 1061 is there)...http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Datron

author: TheDefpom
author_rank: Frequent Contributor
timestamp: March 29, 2023, 09:26:07 am
content: Very nice scan !Added to my collection also, one day I will have to setup a public server for people to access all my files !

author: theHWcave
author_rank: Regular Contributor
timestamp: July 24, 2023, 02:53:29 pm
content: Slightly off-topic but related. Now that we have the service and cal manual (Thanks @Volvo_Nut_V70) , I am looking for the 1065/1065A User's Handbook. Anyone?
DP832 LAN disabled - Page 1
Forum section: electronics / testgear

author: MacMan72
author_rank: Contributor
timestamp: July 24, 2023, 01:02:07 pm
content: I just picked up a new DP832 PS and I don’t understand how people are able to remote into the power supply when the lan is disabled and apparently cannot be enabled without purchasing a license. I plugged it into my network and the status lights don’t even blink. There are no new devices on my network and the lan option is grayed out in the ps. Has Rigol stopped people from being able to remote access the ps or am I missing something?

author: Muttley Snickers
author_rank: Unknown
timestamp: July 24, 2023, 02:14:09 pm
content: I believe the Serial and LAN are optional extras on the DP832 and are included on the DP832A. Upgrades for your DP832 are available by purchasing licenses as you are aware, or by other means as described on page 18 in the thread linked below.https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/There are plenty of threads and information around on making these options available, the thread linked below might also be of interest.https://www.eevblog.com/forum/testgear/rigol-dp932u-unlocking/

author: MacMan72
author_rank: Contributor
timestamp: July 24, 2023, 02:43:46 pm
content: Worked like a charm, thank you sir, you are a steely eyed missile man
8568B YTO ERROR - Page 1
Forum section: electronics / testgear

author: Gianni
author_rank: Contributor
timestamp: July 24, 2023, 10:35:42 am
content: Hi,I bought a lovable 8568B declared as not working. The first problem it had was easy: just a stuck key. Fixed it, all the instrument seems to work correctly, but ...the trace is always zero, whatever I connect to the input.After some time, an "YTO ERROR" appears on the screen. Please note: not "YTO UNLOCK", but "YTO ERROR".This message is not listed among the possible error messages. Could please someone help me or give general advice to afford the beast?ThanksGianni
BM235 "- - - -" Error Screen on Ohm/Continuity Mode? - Page 1
Forum section: electronics / testgear

author: penguins
author_rank: Newbie
timestamp: July 23, 2023, 02:08:11 am
content: Hello,I'm an infrequent user of this multimeter, but it's treated me well for a few years. I'm not able to do any resistance or continuity measurements with it right now, though. The screen just shows four dashes, "- - - -", when I switch to that mode. I don't see this explained in the manual. All other modes work fine. Probes are also OK (measuring accurate voltages, etc.). A few notes:Already replaced batteries with new ones.Meter is definitely not in "EF" mode.Checked both fuses to be OK.Cleaned contact pads on PCB & dial springs. Everything looked OK from initial inspection.Just hoping someone has an idea of what to look at next. None of the buttons change the screen display, though they still make audible noises.

author: J-R
author_rank: Super Contributor
timestamp: July 23, 2023, 02:48:33 am
content: It shows the dashed lines while it is autoranging. What happens if you manually select a range?

author: penguins
author_rank: Newbie
timestamp: July 23, 2023, 04:33:08 am
content: Ok, it seems like it's stuck there. Maybe I can find that part of the circuit and focus my search. Thank you.None of the buttons change the screen. I hear beeps, but the display is a constant "- - - -".
Hittite hmc-t2100 - Page 1
Forum section: electronics / testgear

author: romal76
author_rank: Contributor
timestamp: July 22, 2023, 08:33:39 am
content: Hi All!Looking for v.1.4 and v2.3 software for Hittite hmc-t2100 signal generator.Downloads from analog.com having wrong version 2.6 inside of archive and is not working with old hmc-t2100.https://www.analog.com/media/en/evaluation-boards-kits/evaluation-software/hmc-t2000_hmc-t2100_utilities_setup1_4.exehttps://www.analog.com/media/en/evaluation-boards-kits/evaluation-software/hmc-t2100_firmware_update.zip
HP 8505A, Agilent 8714ET...dilemma? - Page 1
Forum section: electronics / testgear

author: wd5jfr
author_rank: Regular Contributor
timestamp: July 24, 2023, 11:43:00 pm
content: I have one of each but I'd like to have S-parameter capability which I need to learn and use for 440MHz and lower frequencies most likely at this time. At 82 I'm trying to find good options to minimize expense and weight. I don't have an HP 8503A test set and unless I find a good deal on one with APC-7 adapters with SMA or N connectors the 8505A becomes a shelf queen or back breaker until a viable option shows up. I see HP 8712B and HP 8753D with N connectors at reasonable prices. Also might consider a nanoVNA but there are so many I don't have clue how to select the best for low frequency use and that has a big screen, low price irrelevant if it's good quality and reliable. Any suggestions appreciated.ThanksHank

author: joeqsmith
author_rank: Super Contributor
timestamp: July 25, 2023, 12:16:50 am
content: Basic NanoVNA attached to a PC would get you a large screen but can you deal with the square wave drive and lack of being able to set the input and out attenuation, along with no DC bias T's?

author: colorado.rob
author_rank: Frequent Contributor
timestamp: July 25, 2023, 02:37:03 pm
content: I agree with Joe. NanoVNA does most of what I need in a VNA. If that's not good enough, modern VNAs from Siglent weigh next to nothing and are reasonably priced. I have a number of boat anchors that I only turn on when absolutely needed because moving them to where they are needed can be so damned difficult. Maybe one day I will have a lab with enough room and bench space that it's not an issue.
Koolertron CJDS98 weirdness - moving to beginners forum. - Page 1
Forum section: electronics / testgear

author: Hank30721
author_rank: Contributor
timestamp: January 31, 2023, 03:26:59 am
content: Hey folks…Long time listener first time caller. I’m an old newbie - I know a little about a lot of things!I have been given this unit (a rebadged juntek psg9080) from a friend as I’m taking an online course building the Elenco AM/FM kit. He has only used it for generating waveforms for audio equipment - never used it for modulated waveforms.The instructions for the kit say to set up the generator for a 1 kHz tone, 455 kHz am modulated carrier, at 80% modulation (depth) and connect it to a test point on the kit through a 0.001uF cap. Then increase the generator’s amplitude (Vpp) until you hear the tone from the radio’s speaker.On the generator, the modulation setup is on one page and the amplitude adjustment and tone frequency is on another page. My experience is that you have to set the amplitude and then switch back to the modulation menu to get the generator to “trigger”. I switch back to the function screen to adjust the Vpp and the generator stops sending the modulated carrier until I switch back to the modulation page.Is that right? Is there another way to do this? I have used an older Heath RF generator and you could vary the amplitude in real time - you activated the modulated carrier, set the tone frequency and dialed the amplitude up or down. It’s a PITA at this point. The manual sux.Any guidance is greatly appreciated.

author: Hank30721
author_rank: Contributor
timestamp: January 31, 2023, 08:51:39 pm
content: Surely someone has one of these and has used it in a similar fashion. Am I setting it up wrong is my real question or is the user interface just that crappy.

author: Hank30721
author_rank: Contributor
timestamp: February 01, 2023, 02:40:46 am
content: Well..the Koolertron failed today so my problem temporarily has gone away.I turned it on and the blue power light came on, but no screen. I turned it off and on again and nothing. I checked the fuse and it was ok. It's just dead.I called my friend who had loaned it to me and he said no problem. He bought it Amazon and was contacting them for help. I decided to buy my own unit - after reading here and watching youtube videos, I ordered a Sigilent SDG1032x. I figure it's a good unit to use as I learn electronics.

author: radiolistener
author_rank: Super Contributor
timestamp: July 21, 2023, 03:41:07 am
content: SDG2042X has more features for it's price and more wide banwidth, can be unlocked to 120 MHz
UNI-T UT16E : no more beeping in continuity test - Page 1
Forum section: electronics / testgear

author: pierre-françois
author_rank: Newbie
timestamp: July 20, 2023, 02:06:03 pm
content: Hello everyone.Few days ago my UT16E stops beeping in continuity test mode but still beeps in diode test mode.I measured the voltage applied in these 2 modes :Continuity test mode : - 3VDiode test mode : + 2,84 VAccording to operating manual "open circuit voltage in around - 1,2 V" in continuity test mode ; so may be it's a startHas anyone already encountered this issue ? Any Clue ?Thanks for future help
R&S EFA TV Test Receiver Manual - Page 1
Forum section: electronics / testgear

author: ocw
author_rank: Regular Contributor
timestamp: November 23, 2019, 04:55:25 pm
content: Does anybody have either an operating or service manual for a Rohde & Schwarz EFA TV Test Receiver? I just obtained one to use for both DTV transmitter servicing and to serve as a standard to compare crest factor and peak power measurements via IC detectors. I currently have circuits built using HMC1030, ADL5511, ADL5502 and LTC5583 IC's.

author: mikemccauley
author_rank: Newbie
timestamp: July 20, 2023, 06:25:27 am
content: Did you ever manage to get a manual?
Willtek 9102 Spectrum Analyzer repair - Page 1
Forum section: electronics / testgear

author: Gustavo
author_rank: Contributor
timestamp: July 21, 2023, 07:20:17 am
content: Dear friends, I got a damaged Willtek 9102 Spectrum Analyzer. And have no technical info at all. There is no information at the WEB regarding this instrument, I need at least a block diagram because a schematic diagram is just a dream. Please help me to save this nice instrument. Thanks in advance. GUS
Accolades to the SDL-1020X-E & KWR102 - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: July 19, 2023, 08:19:59 pm
content: Awhile back we acquired the Siglent SDL-1020X-E and "enhanced" it to the 300W version SDL-1030X with the wonderful help of folks hereWe've used it on a few occasions and no complaints, but never for a really "trying" use, where it would be put thru levels towards the limits.Well that just changed, and the little enhanced SDL-1020 was asked to handle everything a Korad KWR102 30V 30A could deliver. The Korad was specifically acquired to drive a controller we are developing and the controller can output up to 30A at 12V. Later we'll be going much higher in voltage (~90V) and with 8 channels for a different type load. The Korad can't quite get to 12V at 30Amps, limits at 10V for a total 300watts, but close enough for the present, and the small footprint is welcome on a severely crowded bench.Anyway, the SDL was asked to represent a 30amp load, and did so without hesitation. We ran 12V at 25 amps and 10V at 30 amps which are the limits of the Korad could deliver, the SDL fan was running wide open and quite a bit of heat (~300 watts actually) was flowing out the back. The Korad fan was also running wide open and flowing a considerable amount of heat. We utilized a Kelvin connection with the Korad to force the voltage at the controller terminals, which use 4 100 amp 138 watt 3.2 milli-ohm PMOS devices in parallel with proper ballast, and selected for matching. The quality silicone #12 AWG test leads (spade lugs no banana plugs) were getting a little warm handing 30 amps!!So hats off to the SDL-1020, and Korad KWR102 for lending a helping handBest
Peak instruments, worth it? - Page 1
Forum section: electronics / testgear

author: RiRaRi
author_rank: Regular Contributor
timestamp: July 19, 2023, 11:45:45 pm
content: I was looking to buy ESR70 and DCA55 from them. My intentions are good readings for capacitor ESR in-circuit (when possible) and accurate and precise readings out of circuit. Also i want to know how good is their transistor analyzer (DCA55). Especially compared to cheap chinese ones (BSIDE and 7dollar one). Is it better to invest in some other tools for this?

author: tautech
author_rank: Super Contributor
timestamp: July 20, 2023, 01:10:55 am
content: PeakAtlas are members here and many members have their products.https://www.eevblog.com/forum/profile/?u=84715You might like to check out some of their posts.

author: Arts
author_rank: Regular Contributor
timestamp: July 20, 2023, 01:43:22 am
content: I use the DCA55 for field work. Had it for a few years now. Excellent unit, rugged and reliable. On my bench I use a Sencore TF30.

author: RiRaRi
author_rank: Regular Contributor
timestamp: July 20, 2023, 05:08:33 pm
content: Great news, thank you. I am more curious about ESR70. Can it really measure ESR in circuit? Since it measures at different freq it can possibly eliminate need for LCR (if used only for measuring caps on different freq)? I know that it is not most accurate in circuit but still i want to know how accurate is this meter for in in and out of circuit compared to other ESR meters and LCR?
Difference between various logic analyzer module types for TLA715 - Page 1
Forum section: electronics / testgear

author: suspension
author_rank: Regular Contributor
timestamp: July 18, 2023, 04:42:11 pm
content: I am considering buying a logic analyzer TLA715A. This unit supports TLA7AXX, TLA7Lx/Mx/Nx/Px/Qx LA modules. I was not able to understand the different between these types of modules from the internet. Any pointers is highly appreciated.Also, what would be the preferred option between TLA715 and Agilent 16902/16900?

author: gslick
author_rank: Frequent Contributor
timestamp: July 18, 2023, 06:42:47 pm
content: Tektronix Logic Analyzer SeriesProduct Specifications071-1344-02TLA7Lx/Mx/Nx/Px/Qx LA modules:Higher model letters (L, M, N, P, Q) have deeper memory depthsHigher model numbers (1, 2, 3, 4) have higher channel widthsTLA7Lx/Mx/Nx/Px/Qx LA modules all use the same probe cables. Break outs into flying leads for these are easily found at reasonable cost.TLA7AXX modules use different probe cables. Break outs into flying leads for these arenoteasily found at reasonable cost. For example, P6810 probe cable set might cost more than a TLA7AXX module.
Help troubleshooting a HP1742a oscilloscope  - Page 1
Forum section: electronics / testgear

author: MacMan72
author_rank: Contributor
timestamp: July 18, 2023, 01:29:05 pm
content: Greetings all, I am hoping to get some advice on where to focus on a repair I’m tinkering around with. I have an old hp1742a that I’ve had for several years that worked well except for the delay function. It never worked since I bought it but I never bothered to look into it since I was using the scope and didn’t really need that feature. I’ve since upgraded my stable and this scope is not in use anymore so I figured I’d tinker with it to see if I can repair that issue. I’m not going near any high voltage so if anything points to that portion of the scope I’ll probably wave off and call it a wash. There is a service manual online for the scope but the pdf is pretty unreadable so I ordered a paper copy and am waiting for that to arrive. So, down to the issue. I took the cover off to visually inspect for issues and there was an exploded capacitor on the main sweep integrator card so I cleaned it up a bit and put a new one in. When I powered the unit back on, nothing changed, scope still worked fine but still no delay functionality. So I took the cover off again to look for other issues and didn’t see anything obvious so I closed it back up since I wanted to wait until I had a readable service manual before I continued. When I powered it back up, I found that I had no trace anymore. If I push the beam finder, the test signal shows when the channel is connected to the calibration output but it disappears when I release it. So after all that, does anyone have any suggestions on where to start looking for the fault once I get the service manual? I have basic ee knowledge but not specific scope function so any pointers on where to focus would be appreciated. I’m using this more as a learning experience than anything but it would be nice to be able to fix the scope too. Oh, I did pull the horizontal preamplifier/ horizontal output card out to get access to the blown capacitor and I’m assuming that’s where I flexed something a bit taking the card out if that helps any.
A Simple but Surprisingly Useful Pulse Generator - Page 1
Forum section: electronics / testgear

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: July 16, 2023, 11:52:21 am
content: I have a need for long period pulses to simulate real world events. To that end, I had two pulse generators on my bench, HP8011A and HP8112A. The 8112 is a nice instrument and serves most needs, but the pulse period only goes out to 1s. My 8011 would go to 20s or so. Anyway, my 8011 failed with really complex symptoms that I really could not justify spending the time to fix. Still needing reliable long period pulses I set out to create my own. I stripped the thumb wheels out of the 8011, grabbed a PIC24 and knocked out what is pictured below. It is very simple in that amplitude is fixed 5vdc and only the period and pulse width are adjustable. If I need "fancy" pulses I can use it to trigger my 8112. The PW is quite accurate down to 20us. Below that, the micro overhead begins to kick in. Period is equally impressive. With period set to 900 seconds and a four hour run, my non-scientific observation was pulse count bang on 16 at the 0 second mark as observed against my bench digital clock. I'm using a 8MHz crystal on the PIC instead of the internal oscillator.

author: RoGeorge
author_rank: Super Contributor
timestamp: July 16, 2023, 03:04:43 pm
content: Nice!Reminds of the "darkroom timers" for developing photographic film.

author: slugrustle
author_rank: Frequent Contributor
timestamp: July 16, 2023, 03:32:52 pm
content: That's a nice looking box. How did you do the square cutout, and how did you do the lettering?What are you using for the line driver? I'm pretty sure PIC24s don't go to 5V.

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: July 16, 2023, 03:59:11 pm
content: Quote from: slugrustle on July 16, 2023, 03:32:52 pmI drew up the panel and sent it off to Front Panel Express for fab. The thumb wheel decimal is done with a paint pen.Quote from: slugrustle on July 16, 2023, 03:32:52 pmNo line driver, It's a 24FV not 24F.
INSTEK GPP-4323 - Page 1
Forum section: electronics / testgear

author: trp
author_rank: Newbie
timestamp: July 15, 2023, 08:18:51 am
content: I was looking at purchasing the gpp-4323 as an entry level PSU for some projects I'm working on. I was drawn to the 4CH + variable load capability combined with price. However, it seems like the base model is discontinued (at the very least I can't find it anywhere reputable)? It seems like only the LAN (+$150) and GPIB (+$250) are available? Just wondering if this is accurate, and if there are any alternatives still in the base models price range.Thanks!

author: Hydron
author_rank: Super Contributor
timestamp: July 15, 2023, 08:59:31 am
content: The LAN function is pretty useful, but was only about 30€ more when I bought mine (i.e. a no-brainer). I did see that the PSU price has increased in general - maybe this coincided with dropping the no-LAN option and made it seem like a bigger step in price?

author: trp
author_rank: Newbie
timestamp: July 15, 2023, 08:49:05 pm
content: Quote from: Hydron on July 15, 2023, 08:59:31 amAhh thats possible. It's a lot harder to justify this for me over an 832 or 3303x-e with such a price difference now.
HP/Agilent 16900 Logic Analyzer licenses - Page 1
Forum section: electronics / testgear

author: keitheevblog
author_rank: Regular Contributor
timestamp: July 16, 2022, 04:26:25 am
content: I was trying to import a Module Binary file exported from my Agilent 16900A from the mainframe into the same version of software running on my desktop PC.Much to my surprise, during import a message popped up, "No Data_Import license is available. Only 16 data rows were imported. Subsequent row(s) ignored. 4194304 data rows expected; 16 rows read 16 rows imported". See attached screenshot.Has this problem been solved with this end of life product? For this and other licenses?Thanks

author: ALarsen01
author_rank: Newbie
timestamp: July 15, 2023, 05:16:13 pm
content: The work around for not paying the license fee is to do a Save As, and make sure the All Data and Setup box is checked. The use of the import tool is a pay wall.The link below will take you to the answer on Keysights website.https://edadocs.software.keysight.com/kkbopen/is-there-a-way-to-view-the-data-i-captured-with-my-logic-analyzer-on-my-pc-577941510.html
Pomona Test lead wire - Page 1
Forum section: electronics / testgear

author: Oldtest2
author_rank: Newbie
timestamp: July 14, 2023, 04:14:47 pm
content: New member as of today. I am working on a few HP 410 series VTVM's, of course most need new test leads. Any reason not to use the Pomona 5kV, 6734? (with black and red, 50' it does add up cost). It appears to be about the same dia., .140 to .144. I noticed the 410C leads are thinner, around .125, anybody know if the .144 wire will fit through the rubber boots on the front panel? If I can, 2nd question, it looks like the black jacket on the shielded leads may be able to be saved, what is the best solvent or chemical to use to soften and save the existing cables. Thanks.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: July 14, 2023, 08:45:56 pm
content: The lower volt/ ohms leads are probably different than the HV leads. HV leads have smaller dia Wire and higher resistance that will make a difference in the readings, especially at low volts and low ohms.perhaps this group can help:https://groups.io/g/HP-Agilent-Keysight-equipment/messages
Siglent SDS1104X-E 'Upgraded' to 1204 - Which Firmware ? - Page 1
Forum section: electronics / testgear

author: TomKatt
author_rank: Frequent Contributor
timestamp: July 14, 2023, 05:18:51 pm
content: I searched the forums but did not find anything appeared relevant...I 'upgraded' my Siglent SDS1104X-E to the 200 Mhz version using the serial generator code. No issues and it seems to work fine and now identifies itself as the SDS1204X-E model, which makes sense. I see there is a firmware update available for the SDS1104X-E model (and the 1102 + 1202), but curiously there does not seem to be any release (or past history) at all for 4 channel 200 Mhz SDS1204X-E models?Has anyone been in this situation that can suggest which firmware file version I should use? I'm assuming that the SDS1104X-E firmware is the one to use in my case. If the update complains about incorrect model, I guess I could 'downgrade' my scope to it's original configuration, apply the fw update and then 're-upgrade' it again, since it's just option serial codes.Any information would be appreciated - thanks!Edit - list of FW files available. No 1204 version at all? Strange.

author: rf-loop
author_rank: Super Contributor
timestamp: July 14, 2023, 05:30:15 pm
content: Quote from: TomKatt on July 14, 2023, 05:18:51 pmYou tell "there"... I ask Where.Here are official FW dowloadshttps://www.siglenteu.com/service-and-support/firmware-software/digital-oscilloscopes/#sds1000x-e-seriesAs you can see there is SDS1xx4X-E nowhere is FW just for SDS1104X-E because both of these 4 channel versions have exactly same FW. (And OS)

author: TomKatt
author_rank: Frequent Contributor
timestamp: July 14, 2023, 05:32:37 pm
content: LOL - just edited my post to include the list of fw files.Even if there was a 1204 version available, which would I use in my case?

author: TomKatt
author_rank: Frequent Contributor
timestamp: July 14, 2023, 05:38:16 pm
content: Quote from: rf-loop on July 14, 2023, 05:30:15 pmOMG - I was completely looking at that and did not see it. I kept seeing 11x4 somehow.Thanks for point the obvious out to me lolz.

author: mwb1100
author_rank: Frequent Contributor
timestamp: July 14, 2023, 05:40:16 pm
content: SDS1xx4X-E includes the SDS1204X-EQuote from: TomKatt on July 14, 2023, 05:32:37 pmAs far as I know, the latest. Maybe Tautech will chime in if that's not the case?Note that there are both firmware and OS updates. They are at times related - in that a feature enabled by new firmware might not show in the UI unless the OS is new enough. Or something like that.

author: tautech
author_rank: Super Contributor
timestamp: July 14, 2023, 08:00:21 pm
content: Quote from: mwb1100 on July 14, 2023, 05:40:16 pm100%TomKatt, from your list (US website SDS1000X-E series FW) download andunpackthe 2nd and 3rd in the list.Then read the attached PDF's for further guidance.Come back if you need advice.
Krohn Hite 3800 Tracking Filter - Page 1
Forum section: electronics / testgear

author: 1audio
author_rank: Frequent Contributor
timestamp: July 19, 2023, 04:59:03 am
content: I have one. I just ressurected it, did the calibration/alignment and verified its function. Some pictures below.Now that its working its not suitable for what i needed- to measure a 100 uV signal amplitude accuractely. It does have bandwidths down to nothing- 1 milliHertz. However even in cal mode its not level accuracte and its minimum sensitivity to lock is too high for my application. This all left me wondering just what would this be useful for? Especially with AGC how are you getting info on the signal when you already know a lot about it to find it?I think I'll sell it if it really isn't that useful for signal analysis for me.

author: Performa01
author_rank: Super Contributor
timestamp: July 19, 2023, 07:00:00 am
content: Nowadays we would use a DSO for signal analysis - this is indefinitely more powerful.If we can get a sufficiently strong copy (signal fidelity not important, only frequency and phase matter) of the signal to be analysed, that can be used as trigger, then the DSO can accurately analyse signals down to the single digit microvolts in averaging acquisition mode. And other than any BP-filter, this preserves the harmonics, hence the true signal shape, which is a prerequisite for true signal analysis.If there is no trigger signal, then the advanced FFT in modern DSOs can still quite accurately measure spectral components down to about -100 dBm (= 2.24 µVrms = 6.32 µVpp). The advantages compared to a tracking filter are:Weak signals, even totally burried in noise can be analysedWe can see (and measure) all signals or signal components instantly and at the same time respectivelyThis is not limited to audio, but applies to the full bandwidth of the DSO
Need help with OK Industries FCR-2000 FCR-2201 - Page 1
Forum section: electronics / testgear

author: Hootis Tigglebits
author_rank: Contributor
timestamp: July 14, 2023, 05:47:47 pm
content: My company has two FCR-2201's. I was wondering if anyone might know if there are any hot air handpieces which are interchangeable with this system? It sucks, blows, and heats. I've checked ebay for an exact replacement, but have had no luck.
Interpretation for a safety warning in the Rigol DP932A user manual - Page 1
Forum section: electronics / testgear

author: pstephens
author_rank: Newbie
timestamp: July 14, 2023, 02:37:51 am
content: Hi--I'm new to the forum and easing into electronics as a hobby.I now have a Rigol DP932A bench power supply and it has a curious warning in the safety instructions:QuoteThese words do not mean much to me. What's the difference between an active load and a pure load in this context? And what is the statement warning against?https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-8bcd4294-be35-42c8-beda-dc121d720dca/1/-/-/-/-/DP900_UserGuide_en.pdf

author: tautech
author_rank: Super Contributor
timestamp: July 14, 2023, 03:27:10 am
content: Quote from: pstephens on July 14, 2023, 02:37:51 amWelcome to the forum.An active load is one that could send a voltage back into the PSU vs a resistive loadExamples areSolenoidsRegen motors.QuoteBack EMF/reverse voltage.

author: Someone
author_rank: Super Contributor
timestamp: July 14, 2023, 03:43:01 am
content: Quote from: pstephens on July 14, 2023, 02:37:51 amAn alternative phrasing is that the supply is "single quadrant" and using it outside that mode can cause catastrophic damage.https://edadocs.software.keysight.com/kkbopen/what-is-a-bipolar-four-quadrant-power-supply-583425137.html

author: RoGeorge
author_rank: Super Contributor
timestamp: July 14, 2023, 04:59:03 am
content: Also beware when charging batteries. Always use a series diode (for DP832 it is specified in the manuals) and a fuse.For example when charging a car battery, at a mains power surge, or at an accidental reset, or if the power supply become defective, then your battery will become the source and may damage the power supply. And if the battery is big enough, a short circuit in the power supply can easily start a fire.
Version 2.15 or 2.28 firmware for Tektronix DPO4000 MSO4000 - Page 1
Forum section: electronics / testgear

author: JuliusJ
author_rank: Newbie
timestamp: July 14, 2023, 04:50:14 am
content: Hello Interweb -I have a Tektronix DPO4000 that is running a version 2.01 firmware. It doesn't appear to have been updated after it was made. I tried installing a version 2.68 firmware, the current one, and nothing happens. The scope just boots like normal, and doesn't seem to read the flash drive.A couple things I can share -- The scope does recognize the USB flash drive without issue as I can explore it using the file explorer- I have tried the forceinstall.txt approach, with no difference- I have tried using different USB ports, with no difference- I have tried downgrading the firmware to 2.58 with no difference - this is the oldest firmware that Tek has listed on their website- I am not technically adept enough to read what the scope is doing to figure out what is happening (but I am teachable)So here I am, hoping that an earlier version firmware will work. Admittedly this is a low likelihood event, but it is worth a try.Did you happen to have one downloaded long ago that you can share?Thanks for your help, and any suggestions.