hybridfree/eevblog-posts huggingface dataset:
LeCroy 44MXi-A power issue  - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: February 16, 2024, 08:50:30 am
content: Hello all,I'm facing some issue with a gen2 (red acq board) WaveRunner Xi-A scope, the symptoms are:It runs fine for quite some time (several hours), then abruptly "shuts down", and only the backlight of the LCD keeps flickering, about once every 1-2 seconds... no fans, no nothing.I can then 'really' power it off (long pression on the power button), but it won't (re)start, excepted to have the backlight flickering again...That goes on for a few hours (quite a long time), then it works again 'normally'.I'll of course disassemble it, but given the difficulty (long delay) to reproduce the issue, I'm collecting any comments/ideas upfront...I've already had bad PSU's in these LeCroy scope, but the failures I've seen had the PSU stop alltogether, as the backlight gets power from the (PC) motherboard (which is then 'dead'), I'm a bit sceptical that this might be a PSU-only issue...Here, after the 'failure', I need to stop the PSU by a long push on the power button first.Long story short, I'm not expecting miracles, just that if someone already encountered similar symptoms, his/her input could definitely be valuable before digging into this.All suggestions/comments/ideas welcome !!
HP 53131A FREQUENCY COUNTER HELP - Page 1
Forum section: electronics / testgear

author: samson
author_rank: Contributor
timestamp: November 22, 2023, 10:56:46 am
content: Hi, I have the HP 53131a Frequency counter with the genuine HP 010HS med oven oscillator fitted. My question is if I take the HP 010HS out of the unit and bench calibrate it against a 10mz gpsdo and connected to a oscilloscope ,I can adjust the trim pot so it is exactly 10mhz. When put it in the HP 010HS back into the counter and do a time base calibration is comes up as failed. To fix this I have to turn the trim pot on the HP 010HS oscillator out of the 10mhz zone and do the test again and it will pass the test. Is this because the algorithm its to far off for the it to make the adjustment.? and why do they put the trim pot there.The other question is when the HP 53131a comes from the factory fitted with 010HS oscillator does it still have the on board oscillator at the back of the unit or do they omit this.Any help or advice appreciated

author: artag
author_rank: Super Contributor
timestamp: November 23, 2023, 12:01:11 am
content: Does the 53131 adjust the frequency control voltage both + and - from zero or does it need to adjust it into a +ve range only ? If so, setting the frequency such that it requires 0v input to get 10MHz would be on the limit of the adjustment range.If you haven't seen this article already you may find it interesting (but he talks about making small random adjustments to the trimmer rather than setting it outside of the counter).https://damien.douxchamps.net/elec/equipment/hp53131a/timebase_MDA/

author: alan.bain
author_rank: Regular Contributor
timestamp: November 23, 2023, 12:54:09 am
content: I seem to recall the HS 010 is based around the HP10811. When you calibrated externally what EFC voltage did you supply to the unit? I seem to recall that when EFC was not used pins 5&6 are shorted which is a zero EFC.The timebase board has a AD7243 configured in -5 to 5 mode to drive the EFC line.The only 53131 I used had the HP-especially-drifty-timebase so no practical experience!

author: snickers
author_rank: Contributor
timestamp: February 16, 2024, 03:08:08 am
content: You can use two different methods of calibration:1. Manual analog - with the potethiometer. In this case your board do not take care of DAC signal from MCU of the unit and all calibrations will fail.2. Digital DAC. You need to turn OFF jumper of the potentiometer and then start origial calibration procedure. It will pass. EFC signal will be drived by DAC acording with the signal from MCU of the instrument. But the position of potentihometer will not care.
Smart Module adapter for the Juntek PSG9080 function generator - Page 1
Forum section: electronics / testgear

author: Mick_Go
author_rank: Contributor
timestamp: January 01, 2024, 05:57:33 pm
content: I've had this function generator for 3 years and I see that there is now an iPhone app and an interface for the TTL port. Can anyone tell me where I can get this interface? I contacted Juntek but received no reply...

author: Wil_Bloodworth
author_rank: Regular Contributor
timestamp: February 15, 2024, 11:10:06 pm
content: Quote from: Mick_Go on January 01, 2024, 05:57:33 pmI opted for this module when I bought mine... but I've not been able to get it to work so I'm not sure it was worth the money... could just be me.- Wil
Where's the cheapest place to get a Rigol DHO914 in the UK?  - Page 1
Forum section: electronics / testgear

author: LektroiD
author_rank: Frequent Contributor
timestamp: February 14, 2024, 07:29:58 pm
content: I'm looking to buy one, also wondering if it is hackable up to a DHO924? I've read a few threads saying the 804 can be boosted to a 814, but not sure about the 900 series, or how to actually hack it. I remember hacking my DSO1054z via a website some years ago, not sure if hacking a DHO900 series would be that simple.

author: thm_w
author_rank: Super Contributor
timestamp: February 14, 2024, 11:15:11 pm
content: Save your money and get a DHO800.

author: LektroiD
author_rank: Frequent Contributor
timestamp: February 15, 2024, 01:08:45 am
content: Is that hackable up to 250MHz?

author: Caliaxy
author_rank: Frequent Contributor
timestamp: February 15, 2024, 01:34:43 am
content: Wild guess: Aliexpress?

author: thm_w
author_rank: Super Contributor
timestamp: February 15, 2024, 01:37:52 am
content: Quote from: LektroiD on February 15, 2024, 01:08:45 amIts hackable in the same way as the DHO900, yes, just missing logic analyzer and signal gen hardware.
Nano VNA H4 v Tiny PFA from Mirfield Electronics - Page 1
Forum section: electronics / testgear

author: 807
author_rank: Frequent Contributor
timestamp: February 17, 2024, 09:58:35 pm
content: There's a site in UK called Mirfield Electronics selling the Nano VNA H4 and the Tiny PFA. My understanding is that the PFA is just a reprogrammed VNA H4. However, the PFA sells for £64.95, while the VNA sells for £79.95. This doesn't make sense to me, as it's the same hardware. I contacted the seller with this question:-"Hi. I've been reading about converting a Nano VNA H4 to a PFA. I notice that you sell a ready configured PFA for £64.95, but an H4 for £79.95. I was wondering why the PFA is cheaper when the same hardware is used?"This was the reply:-"The PFA isn’t a VNA that’s probably why but Erik Kashoek is the man see the web site on tinysa.org"I was very disappointed with the reply, as it didn't answer the question at all. It's as if the guy didn't really understand what he was selling. I know a PFA isn't a VNA. And what has Erik's tinySA wiki got to do with it? I was assuming that this company bought in the VNA's & flashed the firmware themselves, so was expecting the PFA to cost a bit more because of the extra work involved, but they are £15 cheaper than the VNA.I was wondering if the case & calibration parts weren't included with the PFA, but there's no photo & no description of what's included, & I thought that would have been mentioned in the reply.Has anyone else ordered a PFA from this place?PFAhttps://www.mirfield-electronics.co.uk/tiny-pfa-freq-phase-analyser/VNAhttps://www.mirfield-electronics.co.uk/nanovna-network-analysers/

author: erikka
author_rank: Regular Contributor
timestamp: February 18, 2024, 06:20:25 am
content: The tinyPFA does not come with the SMA male calibration kit which explains the cost difference

author: 807
author_rank: Frequent Contributor
timestamp: February 18, 2024, 12:12:55 pm
content: Quote from: erikka on February 18, 2024, 06:20:25 amThanks for clearing that up. I suspected that might be the case. I was surprised that Mirfield don't tell you what's included on their website, or that they didn't tell me when I asked.Thanks also for creating the firmware.Look forward to playing with the PFA when it arrives.
Fluke 8808A audible tone in diode test - Page 1
Forum section: electronics / testgear

author: pasik
author_rank: Newbie
timestamp: February 14, 2024, 07:37:03 pm
content: Hi, I have bought this meter and after some tests with diode test I'm a little disappointment or maybe I do something wrong. In the manual there is described that diode test is with audible tone. I have some other fluke multimeter on which diode test use continue beep if probes are shorted, or there is only one beep if forward voltage is couple of hundrets milivolts. In this bench multimeter there is no any beep in diode test, only in continuity test (only after probes are short) but like I mention before manual descibes that both modes have audible tone.So can somebody tell me how it is with this fluke 8808a ?

author: bdunham7
author_rank: Super Contributor
timestamp: February 14, 2024, 07:56:54 pm
content: My 8808A does not make any noises in the diode test function and has a continuous tone in continuity mode when the resistance is less than 20 ohms. This is as described in the manual p. 3-15, but I do see that in the specifications section it lists the diode function as having an audible tone. Unfortunately that appears to be incorrect. On the bright side, it does respond very quickly--the 100 samples per second looks right.

author: pasik
author_rank: Newbie
timestamp: February 14, 2024, 08:07:38 pm
content: So it's a shame because this audible tone in other fluke dmm in diode test is very convinient for fast junctions tests without a need to looking at the display

author: bdunham7
author_rank: Super Contributor
timestamp: February 14, 2024, 08:43:47 pm
content: Quote from: pasik on February 14, 2024, 08:07:38 pmIt would be nice touch and I wouldn't think there would have been any incremental cost. The other (now discontinued) Fluke bench meters, the 8845A and 8846A, have half the feature. They have the short beep for the good junction, but nothing for a short. I've no idea why.
Newly acquired signal generator ET3360C disassembly test - Page 1
Forum section: electronics / testgear

author: clement
author_rank: Newbie
timestamp: July 06, 2023, 08:08:46 am
content: I received the signal generator today. Unlike other white shells, it has a black appearance. The shell is made of plastic material, and the product is very light, and the waveform is not particularly good. So I took it apart and found that there are many relays on the circuit board, and there are two unknown connecting wires. It feels like a repaired product, which completely does not meet my expectations.

author: Aldo22
author_rank: Super Contributor
timestamp: July 06, 2023, 10:17:33 am
content: The soldered wires seem to be normal.Someone posted a photo of the same board onBanggood.The sine wave looks weird.Can the oscilloscope keep up? Amplitude modulation?

author: clement
author_rank: Newbie
timestamp: July 08, 2023, 03:26:59 am
content: Using "Keysight Technologies" Bandwidth 1G，There will be relatively high peaks in the test sine wave output, I am worried that it will burn out my equipment, and I am ready to return it

author: jonwilhelmjr
author_rank: Regular Contributor
timestamp: February 18, 2024, 12:33:01 am
content: https://www.easttester-cn.com/uploads/ET33-Series-Arbitrary-Waveorm-Function-Signal-Generator-User-Manual.pdf

author: coromonadalix
author_rank: Super Contributor
timestamp: February 18, 2024, 07:25:36 am
content: Return this ....
Siglent SLA1016 decode function on SDS1104x-E - Page 1
Forum section: electronics / testgear

author: FrankDS
author_rank: Newbie
timestamp: February 13, 2024, 07:35:14 pm
content: I cannot get the decode function on the SDS1104 to work with an I2C bus on the SLA1016 digital pins. It works perfectly on the scope directly if use an oscilloscope channel. Not sure if this is a supported feature or am I doing something wrong?

author: TheDefpom
author_rank: Frequent Contributor
timestamp: February 13, 2024, 08:44:19 pm
content: Shift the digital input connections up by 1, so you use D1 and D2 inputs so you don’t use D0…. But still use D0 and D1 on the scope settings.There is a bug, I will be showing this in an upcoming review video next week.

author: FrankDS
author_rank: Newbie
timestamp: February 14, 2024, 12:11:00 am
content: Wow. That worked - how on earth did you figure that out!I will check out your channel to learn more about that bug.Another nice feature missing from the DSO is that horizontal time base zoom that is only available if you use the scope channels - that thing saves so much time.
ROHDE & SCHWARZ SMS geerator replace buttons - Page 1
Forum section: electronics / testgear

author: george79
author_rank: Contributor
timestamp: February 06, 2024, 06:58:52 am
content: Hello,just a quick question please, im trying to find some replace buttons outer part for the SMS generator. Can anyone help me with the type or give me a path how to search them, need to be functional, not to be exact color etc.

author: george79
author_rank: Contributor
timestamp: February 06, 2024, 07:31:08 pm
content: please any help on this? i have searched all the internet without any success, need only the type of the buttons, as i can imagine, its not something tha was made for this generator only

author: rf-messkopf
author_rank: Regular Contributor
timestamp: February 07, 2024, 10:58:39 am
content: In that era, Rohde & Schwarz often sourced pushbuttons from Preh (https://www.prehkeytec.de/, they no longer make this kind of buttons) or Schadow (today part of Littelfuse/C&K Switches,https://www.ckswitches.com/).The button caps on the SMS look similar to these, but I'm not sure:https://www.ebay.co.uk/itm/115873394817.Edit:TheSchadow "Digitast"series pushbutton switches are still available. Maybe the ones with wide button caps match the SMS.Edit 2:Some more ebay finds:https://www.ebay.de/itm/325362252065https://www.ebay.de/itm/325361173018https://www.ebay.de/itm/325362047420

author: wkb
author_rank: Super Contributor
timestamp: February 14, 2024, 08:11:27 pm
content: These are Shadow switches indeed. You can gently pry off the keycaps and transplant these to new switches.Wilko
Patch leads for HP16058A - Page 1
Forum section: electronics / testgear

author: Keith956
author_rank: Regular Contributor
timestamp: April 29, 2021, 04:51:34 am
content: I'm looking for the patch leads for a HP16058A test fixture, both the 16058-61600 'large to small' and 16058-61601 'small to small' ones.Or better, the 'large' and 'small' plugs to make up some of these leads. The large plugs are (I think) 2mm stackable banana plugs that can be bought from the likes of Farnell, but I can't seem to find the small ones which are < 1mm diameter pins. If anyone knows of a source for them I'd be most grateful.

author: FFY00
author_rank: Contributor
timestamp: February 14, 2024, 08:21:28 am
content: Did you end up finding which kind of "miniature banana" they are?

author: coppercone2
author_rank: Super Contributor
timestamp: February 14, 2024, 08:42:39 am
content: it a tip* jack. 1 size smaller then mini bananas . fits a DMM probe tooone amazing connector IMO. HP used it for board interfaces when it was not a stingy miserIMO a solid connector choice for any low current device. just gotta have cables. having 4mm banana kinda gets old everywhere just because of interoperability and being too cheap for proper cables.you know like proper dining instead of being the guy drinking soup with a fucking commercial size ladleits like being posh enough to own a tea spoon.why are they good. you get less tangles on complex test cables. it weighs less. its less bulky.the next devolution in electronics is going to be using a paper clamp to sandwich wires on a piece of bare PCB sticking out of the frontdespite the name, the connector does not use a solid cylinder. it works with one (dmm probe) but the proper interface for it... is a mini mini banana style connector made out of spring contacts.when you look at electronics interconnects it reminds me of the startrek TNG episode "genesis"work of the MBA , with a computer engineering background
Protek C3100 Counter Programmers Reference? - Page 1
Forum section: electronics / testgear

author: TheWaterbug
author_rank: Contributor
timestamp: February 16, 2024, 09:28:08 pm
content: Hi! Does anyone here have the command set for theProtek C3100 Universal Counter?ProTekTest.com (dead site) faxed me a copy (yes, faxed!!!) back in 2004, but I can't find the hardcopy, and I don't have any evidence that I ever scanned it. 😡My 2004 email reply to ProTekTest.com read, "Thanks! I just received it. Cryptic, but it looks like it will work just fine."And cryptic it must have been. I did find one old VBA code snippet that I used to read from this device. I sent:Code:F2;G10to set up a frequency reading on one of the ports, and then sent this query:Code:RM?to actually get the measurement.But that's all I've got!Thanks!

author: TheWaterbug
author_rank: Contributor
timestamp: February 16, 2024, 09:54:31 pm
content: Quote from: TheWaterbug on February 16, 2024, 09:28:08 pmAha! I found it! This2016 post here on eevbloghad a malformed link to the owner's manual, due to this site parsing the [square braces] in the filenames, but I was able to parseenough of the URL to find that repository, and it has both theUser Manualand theProtek Generic GPIB/RS232 Programming Manual!The front page of that repository site looks sketchy as hell, but themanuals sectionis a treasure trove!Hope this helps someone!p.s. if anyone else wants to link to any of those files on that site, manually escape the [square braces] in the URLs with %5B and %5D, respectively.
Toptronic T223 Calibration manual - Page 1
Forum section: electronics / testgear

author: Ario
author_rank: Regular Contributor
timestamp: February 13, 2024, 12:27:45 pm
content: Hi there,I am looking for a calibration manual or guide to help me calibrate the Toptronic T223 clamp meter. I opened it up and there are multiple capacitive/resistive pods. I need to know which ones to set to calibrate the rms current.Any help or direction will be appreciated!
How to restore agilent MSO8064A/MSO8000 WINXP system? or reinstall software？ - Page 1
Forum section: electronics / testgear

author: snkawpmap
author_rank: Newbie
timestamp: February 13, 2024, 08:20:10 am
content: I have an MSO8064A. The oscilloscope was installed on Windows XP and had been working well until yesterday when I wanted to update the oscilloscope software. I downloaded the new version of Setupinfinium05710000. Exe, then uninstall the old version of the oscilloscope software as the site explains, but setup in finium05710000. exe. EXE does not work on my oscilloscope. When double-click the install package, only a DOS window pops up and then quickly closes. Maybe Windows XP is missing something. Does anyone know what it is? I installed .NET 3.5 but still can not run the oscilloscope software installation package. I want to restore the system now and use the old software again. I noticed that the hard drive had a hidden partition with backup system files in it. But after the computer booted it went directly to Windows XP, unable to find the option to restore the system. Does anyone know how to restore the system? Thank you so much!

author: snkawpmap
author_rank: Newbie
timestamp: February 13, 2024, 11:20:52 am
content: I tried using GHOST software, and thankfully, I restored the image recovery.gho file. The oscilloscope is working very well now. I saw it on the forum topic"Agilent Infiniium DSO8000A Hacking - anyone done this?" Is there a way to lift the storage depth limit?
Rigol DG1000Z vs. Sanford Research DS345?  - Page 1
Forum section: electronics / testgear

author: W4PJB
author_rank: Regular Contributor
timestamp: February 12, 2024, 07:34:23 pm
content: I came across an opportunity to buy a very nice condition Sanford Research DS 345. Obviously this was a top quality laboratory grade instrument back in its day. Pricing is similar to that of a new Rigol DG1000Z in 30mhz.Is it worth putting an older, high-end function generator on my bench? Or do the benefits of having a modern, but lower end device outweigh having a piece of older high-end kit? Are there any functions or features? I would be missing one way or the other?Not sure if there are any options installed in the Sanford research unit, or if any were even available.Thanks in advance for anyone that can provide some feedback!

author: David Hess
author_rank: Super Contributor
timestamp: February 12, 2024, 11:46:09 pm
content: As much as I might hate to say it, the Rigol DG1000Z is probably a better choice unless you have a specific use for the Sanford Research DS345 or prefer its interface.The largest difference might be that the Rigol has two channels and the SR has one channel.

author: W4PJB
author_rank: Regular Contributor
timestamp: February 13, 2024, 03:17:53 am
content: Thanks for your reply, and great point about 1ch. vs 2ch.I posted this on my way home from picking up a Keithley meter and Aligent power supply. The seller dropped this on me unexpectedly and asked if I would be interested. I told him I would have to get back to him as I was not familiar with that unit and wasn't prepared to make a decision. It seems like a real nice unit, and was in excellent condition, but I also know that sometimes technology moves on, and the "budget" item of today can exceed the "professional" item of yesterday.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: February 13, 2024, 04:55:11 am
content: Features and tolerances DS345.https://www.thinksrs.com/downloads/pdfs/catalog/DS345c.pdfSource:https://www.thinksrs.com/products/ds345.html
How much should I pay for Agilent 54832B Oscilloscope on ebay ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: February 10, 2024, 04:29:11 am
content: Hi,I have checked the prices for Agilent Infiniium oscilloscopes on ebay and they are very expensive. Why does the infiniiums are so expensive even today ? Is it a matter of supply and demand ?What would be a good price to pay for an Agilent 54832B ?Any ideas on how good they are if you have or used one of them.Thank you.

author: electronic_guy
author_rank: Regular Contributor
timestamp: February 12, 2024, 06:11:49 am
content: Hi,Can anyone give me some idea on this.Thanks.

author: ZGoode
author_rank: Frequent Contributor
timestamp: February 12, 2024, 04:56:32 pm
content: There are a couple different versions of the 54832B. What specs are you looking at? I picked up mine a year or so ago for just over a grand. It is the 1Ghz version with all of the serial decoding options installed. I also got a full set of probes with it.Performance wise I am happy with it, but keep in mind its a big boi. Like size of a small suitcase big boi, and its heavy. I'm happy with mine though, and if it has the features you are looking for in the price range you are looking to spend, I'd say go for it.

author: J-R
author_rank: Super Contributor
timestamp: February 12, 2024, 08:26:09 pm
content: Two cheapest on eBay right now are one broken for $500, one working for $900. The prices make sense to me somewhat. At the end of the day it's still a 4 channel 1GHz scope, and if you want something new(er) you'll be paying many times that amount.

author: coromonadalix
author_rank: Super Contributor
timestamp: February 13, 2024, 01:46:37 am
content: depends if you are prepared to use working oldies ... and battle to maintain them, say power supply broke .... since theses Infinium series are pc based scopes ...for used stuff it's always a gamble, you win or looseand ask for a very good protection if you buy it and get it shipped ....
Problem AErr with Keysight U1242B - Page 1
Forum section: electronics / testgear

author: freda
author_rank: Regular Contributor
timestamp: February 12, 2024, 11:55:59 pm
content: I was measuring some 12V stuff with the 10A range, just should be < 4Amp.Then changed to measure volts. Since then AErr on all switch setting, except the A.Switch on/off. Battery disconnect-reconnect. Persistent error, PIA when on the road,thought this was my most reliable meter, fairly new.So the A range has a probe detect switch in the socket. Ok,i'm using my own much shorterleads for the amp tests.Disassembled the meter, probe socket board. test the A socket, and continuity seems ok,probe in, switch closed, probe out, switch open. Looks the same whether i use Keysight lead,or my own.Maybe leakage on pcb?, there's a series resistor of 2.5M to the switch. cleaned around with iso-pNo change still AErr,except A range.I'm a bit stumped about that....So I ended up desoldering the 2pin socket connecting the A socket switch to the PCB.The meter works on all ranges now same as before. Except now i'm not going to havethe probe detection in the A socket.Well i don't recall failing myself with 10amp ranges on other meters, so i think i'llbe happy with just continuing my care with testing high current, as always.Any other thoughts?
Fluke 8000a fault - Page 1
Forum section: electronics / testgear

author: KD9CJX
author_rank: Contributor
timestamp: February 10, 2024, 11:22:07 pm
content: Good afternoon and thanks for reading. Did some searching for this fault and didn't see a thread so I'm going to start a new one. I apologize in advance if it's been answered.I have a Fluke 8000a with battery option. On startup, I got a flashing "1999" on the display. Decimal point moves when range is changed, but no difference in the display. So I broke out the manual and followed the troubleshooting procedures. When shorting out S4 to TP4, I finally got a change on the display. It jumped around and was erratic, but it was something different. So I changed out the analog IC and related resistors/caps/diodes with a NOS analog IC kit from fleabay. After replacing all components, the 1999 was still flashing on the display.Discouraged, I let it run for a while while I consulted the manual, eevblog, and groups.io for any answers and didn't get anywhere. When I monitor the period output for 10 mS, it's all over the place. So is there some PLL that is wonky? Could I inject a 10 ms pulse somewhere to see if that brings it around?This is just a "kicks and giggles" project. Probably already spent too much, but I'm just doing it for fun. I have plenty of bench and handhelds but I'd like to get this one running for the collection.thanks!JoeKD9CJX

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: February 12, 2024, 04:46:31 pm
content: Before doing any more testing, check the batteries, they act as the smoothing cap, the meter will not function properly if they are dead even if you run it from main.If they are dead, put in a set of good batteries before troubleshooting. Good luck.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 12, 2024, 04:51:15 pm
content: From the manual, the Fluke 8000 uses voltage to frequency conversion and a kind of auto zero look. So it is normal that the period / frequency is jumping between two values - that is part of the normal operation. The manual has quite some hints on trouble shooting.

author: J-R
author_rank: Super Contributor
timestamp: February 12, 2024, 08:15:12 pm
content: Also, be sure to clean the switches...

author: med6753
author_rank: Super Contributor
timestamp: February 12, 2024, 08:25:03 pm
content: Is it stuck in Ohms function?

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: February 12, 2024, 10:25:21 pm
content: X2Quote from: J-R on February 12, 2024, 08:15:12 pm
What is the default password for the Rigol DG-1022Z? - Page 1
Forum section: electronics / testgear

author: Ben321
author_rank: Frequent Contributor
timestamp: February 10, 2024, 06:30:18 am
content: When I try to access certain pages on the signal generator's internal web server, it asks me for a username and password. Setting up such a password and/or username is not something I remember doing, so I suspect that it has a default username and password. If anybody here knows what that login info is, please tell me. I couldn't find it anywhere in official Rigol documentation.

author: Ben321
author_rank: Frequent Contributor
timestamp: February 10, 2024, 11:23:27 pm
content: Does nobody actually know the answer to this?

author: Martin72
author_rank: Super Contributor
timestamp: February 10, 2024, 11:50:54 pm
content: Have you tried this:Quote

author: Ben321
author_rank: Frequent Contributor
timestamp: February 11, 2024, 03:55:07 am
content: Quote from: Martin72 on February 10, 2024, 11:50:54 pmI just tried it. Doesn't work. I think the 111111 password is just the default for the calibration menu in the device itself. It's not a password that works with the locked sections of the website hosted by the internal web server.

author: Ben321
author_rank: Frequent Contributor
timestamp: February 11, 2024, 04:47:16 am
content: Finally figured it out after trying a bunch of different easy to guess insecure passwords, and it turned out to be 123456
HAMEG HMO722 Firmware needed (Please Help) - Page 1
Forum section: electronics / testgear

author: DJ_JAM
author_rank: Newbie
timestamp: February 13, 2024, 01:35:59 pm
content: Dear EEVBlog forum members,Half year ago, I bought a used HAMEG HMO722 Oscilloscope and I'm trying to update the firmware.Unfortunately, I can't find the right firmware.I checked R&S website support page and old HAMEG site archive, but there is nothing about this device except user manual.The latest version of firmware I found in release notes is 04.531.I tried to find in Internet any version of the firmware for this device unsuccessfully, so I gave up.My last chance is if someone in this forum have an archive with firmware for this device to be so kind to share it with me or send me a link from where I can download it.Please help.Thanks in advance and best regards to all of you!
Agilent Fieldfox N9912a help - Page 1
Forum section: electronics / testgear

author: axh
author_rank: Newbie
timestamp: February 10, 2024, 12:13:18 pm
content: I recently came across one of these but it doesn't seem to be performing as expected. I don't know much about them but it isn't showing the same VSWR for an antenna as other test equipment. With no antenna connected at all, the attached picture is what's shown. Just wondering if the equipment is faulty or if I'm doing something wrong. When I left it on for a while, it seemed to come good and show roughly what I expected as the VSWR for the antenna (2.4g/5g wifi antenna) but for the majority of the time it's on, the VSWR plot for an antenna seems to have these strange parabolas added to it. Apologies in advance if this is a stupid question, still learning!

author: eb4fbz
author_rank: Regular Contributor
timestamp: February 10, 2024, 03:56:40 pm
content: Have you calibrated it properly?

author: TheSteve
author_rank: Unknown
timestamp: February 10, 2024, 06:17:15 pm
content: That certainly doesn't look good. But a cal has been performed - and if it wasn't done properly it can cause nearly any result.
Documentation, for Stabilock 4013, anyone? - Page 1
Forum section: electronics / testgear

author: OZ4ACL
author_rank: Newbie
timestamp: February 10, 2024, 03:19:33 pm
content: Hi!Have been using a few hours, trying to get Service manual or similar for the Stabilock 4013.Unfortunately with no luck.The closest, is a Servicemanual for the 4010, 4011, 4020 and 4022.But there's a few differences between these, and the 4013. It seems the 4013 is a modified 4011.Maybe mostly converted to dB/µV? This as the front type number, is a sticker atop the 4011 number.Anyone know more?Best regardsTonni
MOVED: 1/f noise of Fluke 8588A in comparision to HP 3458A - Page 1
Forum section: electronics / testgear

author: Halcyon
author_rank: Unknown
timestamp: February 09, 2024, 10:25:16 pm
content: This topic has been moved toMetrology.https://www.eevblog.com/forum/index.php?topic=414518.0
tek tds 5052 scope - Page 1
Forum section: electronics / testgear

author: p.larner
author_rank: Frequent Contributor
timestamp: February 10, 2024, 02:41:29 pm
content: is the tds 5052 a decent scope?,as i have a chance to buy one cheap,any known issues etc?.

author: xtech
author_rank: Regular Contributor
timestamp: February 10, 2024, 03:03:33 pm
content: It is great but old machine (Windows 2000 inside, pretty sure you will have to replace HDD or at least make OS dump). If the price is attractive do not think too long.
Looking for Operating Manual for HP 16064A Comparator Component Handler - Page 1
Forum section: electronics / testgear

author: ZGoode
author_rank: Frequent Contributor
timestamp: February 08, 2024, 04:38:32 pm
content: Does anyone have a copy of the manual for the HP 16064A? I am trying to make a copy of that board for use in one of my pieces of equipment but from the one picture I can find of this on the internet I am not able to identify the various capacitors, resistors, and zeners used.
Kunkin KP184 DC electronic load--anyone else seen this problem? - Page 1
Forum section: electronics / testgear

author: drm1
author_rank: Newbie
timestamp: February 12, 2023, 06:41:59 pm
content: I have a relatively new KP184. After a few uses (no traumas I know of) it starts up with every panel indicator and 7-segment display fully lit up, and does not respond to any key press.All the rails check OK (+/- 12, +5, +3.3). For a while, anyway, there was a sine wave on the crystal and some signals on a few processor pins; now I don't see those, either. Has anybody else seen this failure? And has anybody had any luck getting the manufacturer to reply to a warantee repair request--or at all?Thanks, --Dan M

author: interflexo
author_rank: Regular Contributor
timestamp: March 16, 2023, 04:42:34 pm
content: You can test if it responds to serial commands. A normal working unit works with the front panel disconnected.

author: drm1
author_rank: Newbie
timestamp: February 08, 2024, 03:40:54 am
content: I pulled this out again after a year. Because the rails all seemed OK and the display worked, on a hunch I tried reflowing the processor as a last resort. It took a few tries but lo and behold that did the trick--the unit seems to work fine. Bad solder joint, I guess; maybe this will help somebody in the future.
Philips PM2430/02 service manual - Page 1
Forum section: electronics / testgear

author: gergard
author_rank: Newbie
timestamp: February 14, 2024, 09:30:44 pm
content: I'm looking for the service manual for this Philips voltmeter, I found the PM2430 but it's different from the one I have which is PM2430/02, maybe it's a later version.
AC source fast short circuit protection device - Page 1
Forum section: electronics / testgear

author: semir-t
author_rank: Regular Contributor
timestamp: February 07, 2024, 12:17:42 pm
content: Greeting everyone,I am looking for a fast short circuit protection device for AC sources that I could use when I am powering my custom PCB boards for the first time. I am not keen on using a fuse and would like to use something faster.I found one device here but I can't seem to buy it:https://mediadesigns.co.in/product/medis-fast-trip/Here is the video presentation of their device and this is what I am looking for:I am hoping that someone knows some similar device that can be purchased.

author: alm
author_rank: Super Contributor
timestamp: February 07, 2024, 02:12:40 pm
content: Chroma and HP/Agilent/Keysight make AC sources that can do this and a lot more. They are big and very expensive new, but you can occasionally find a deal used.

author: David Hess
author_rank: Super Contributor
timestamp: February 07, 2024, 02:58:19 pm
content: DC short circuit protection can be used for AC by placing it within a bridge rectifier.A benchtop variable AC power supply should be suitable. A cheap way to do it would be to get a pair of power transformers sized for your load, and connect them back-to-back; this will just limit the current however.

author: TheSteve
author_rank: Unknown
timestamp: February 07, 2024, 04:12:07 pm
content: This is worth watching:

author: David Hess
author_rank: Super Contributor
timestamp: February 07, 2024, 06:50:48 pm
content: Quote from: TheSteve on February 07, 2024, 04:12:07 pmThat brings up the question of how fast he wants it to be. 100s of nanoseconds is possible. Relays are quite a bit slower.

author: ifonlyeverything
author_rank: Regular Contributor
timestamp: February 07, 2024, 06:58:58 pm
content: Quote from: David Hess on February 07, 2024, 06:50:48 pmI'm also interested in a similar project. My thought was for MOSFETs upstream of a relay. If the MOSFETs blow up and fail shorted, the relay will save the day.

author: David Hess
author_rank: Super Contributor
timestamp: February 08, 2024, 02:27:45 am
content: Quote from: ifonlyeverything on February 07, 2024, 06:58:58 pmI would use a fuse instead of a relay as the fail-safe.I think I would use a pair of back-to-back power MOSFETs to switch AC directly with a photovoltaic optocoupler to supply the turn-on bias. For a fast turn-off, I would include a separate optocoupler to drive an SCR (probably a pair of bipolar transistors making an SCR) to short out the gate drive. Now the control circuit is completely galvanically isolated from the power switch, so it can be placed anywhere convenient to measure the current.Big TO-247 power MOSFETs are not too expensive and I think would survive shorting out a 15 or 20 amp standard 120 volt AC circuit until a fuse blew or breaker tripped.
Siglent SSA3015X Plus - what Firmware please?  - Page 1
Forum section: electronics / testgear

author: minsik
author_rank: Contributor
timestamp: February 07, 2024, 11:37:15 am
content: Hi.Apologies if seems a bit dumb. SSA3105X Plus spec an came with 3.2.2.4. firmware.On the web sites it appears to be the last for 3015X plus specific, but is it?SSA3000X Plus appears as later firmware and yet does not actually have a 3000x plus model (I think)So is the "SSA3000X Plus_Firmware_V3.2.2.6.0R7 (Release Date 06.08.23)" now a series update and safe to install in the SSA3015X Plus?Or have I misunderstood?Appreciated any replies. Measure twice, cut once!Minsik.

author: tautech
author_rank: Super Contributor
timestamp: February 07, 2024, 06:04:54 pm
content: Quote from: minsik on February 07, 2024, 11:37:15 amAFAIK all FW versions for similar HW devices are now all aligned with the same FW version.Last SSA3015X Plus shipped had the latest V3.2.2.6.0R7 FW installed without issue.

author: minsik
author_rank: Contributor
timestamp: February 07, 2024, 06:16:49 pm
content: Thanks, I suspected but didnt see confirmation anywhere.appreciated info from you.MInsik.

author: tautech
author_rank: Super Contributor
timestamp: February 07, 2024, 06:34:23 pm
content: Quote from: minsik on February 07, 2024, 06:16:49 pmI do know the analyzer PM had a strong desire to align all FW for similar devices and so reduce the # of versions.Slowly but surely this methodology is migrating into other model series, SNA5000A for example.

author: minsik
author_rank: Contributor
timestamp: February 07, 2024, 09:36:25 pm
content: Yes, I saw model series standardisation with Rhode & Schwarz with the DTV series and many other product lines.Lets all save money I suppose is valid and reduces support lines.Minsik.
EMCView EN55032 Tem Cell - Page 1
Forum section: electronics / testgear

author: Ribster
author_rank: Frequent Contributor
timestamp: February 07, 2024, 01:46:49 pm
content: Hi allI'm trying to use EMCView with my tem cell for CISPR32.Files for EN55025 do exist for tem cell.But i cannot find the files for TEM Cell in the EMCView folder.Also, the sweep only goes to 245MHz.Anyone has got any experience with finding the files and increasing the sweep frequency to ~ 3.2Ghz ?

author: Kean
author_rank: Unknown
timestamp: February 07, 2024, 02:20:22 pm
content: I am running 8.54, and have been doing CISPR15 tests with a LISN and TEM cell. I made my own custom projects with minor adjustments which were copies of the relevant .prj files under the src folder.I had a go at customising my own segment files, but couldn't quite understand how they worked. They are all text files, but I think the structure requires some understanding of the code.What version are you running? I see there is a new 9.18 release.In your version, is there a TC folder under src\CISPR 32_EN55036_V1_3 folder? In 8.54 are TC folders under CISPR 14, 15, & 25FYI, when I have contacted Tekbox support they have always been very helpful.
opinion MDO-2072EG - Page 1
Forum section: electronics / testgear

author: Bartolome
author_rank: Newbie
timestamp: February 05, 2024, 07:43:19 pm
content: I ask the moderator to change it where appropriate if this is not the section.They offer me a GWInstek MDO-2072EG in my country, for about $600.00.It would be my first oscilloscope + spectrum analyzer. ¿It is a good option as a first starter kit?. I am a technician from analog electronics and I am only going to use it with tube transmitters mainly. Of course, I highly value the size due to space problems in my workshop.Thanks for your opinions.Best regards from Madrid

author: Grandchuck
author_rank: Super Contributor
timestamp: February 06, 2024, 07:49:02 pm
content: Looks like a nice instrument.What are the frequencies for the transmitters that you will be working on?

author: Bartolome
author_rank: Newbie
timestamp: February 07, 2024, 07:33:53 am
content: Greetings GrandchuckThanks for answering. Up to 150Mhz. I'll try to see if the offer is still valid. I had several interested parties when I saw it.
Hioki 3227 AC voltage input change - Page 1
Forum section: electronics / testgear

author: R-1125F
author_rank: Regular Contributor
timestamp: February 05, 2024, 04:07:09 pm
content: I picked up a Hioki 3227 that is set for 100VAC power. I need to change this to 120VAC. There are many taps on the transformer input but nothing is marked. Could someone tell me what jumpers to change?

author: DavidKo
author_rank: Frequent Contributor
timestamp: February 06, 2024, 08:24:59 am
content: I expect that now are 2 windings in parallel. Pictures will help. Plug the device to AC100 (I use autotransformer) measure the voltages across the taps. Usual connection is 0-100-10-10 and second winding same 0-100-10-10. In your case you will leave the zeros interconnected and move the parallel connection of the "phase" to the last taps.

author: R-1125F
author_rank: Regular Contributor
timestamp: February 06, 2024, 07:52:26 pm
content: Thank you for the reply. H I figured it out. What I did was measure the winding resistance and picked the highest one for 120V. It seems to work fine (no smoke). The confusing part is that there were 9 wires for the 2 primaries. One wire went to the transformer frame/shield. The other 8 wires were just a standard dual primary multi-voltage transformer. The other confusion was a jumper for the AC input. That also needed to be moved. I have attached the before and after photos for the 100V and the 120V jumper connections. Hioki is really bad about posting service information.

author: DavidKo
author_rank: Frequent Contributor
timestamp: February 07, 2024, 05:46:53 am
content: Hioki does not support older equipment. The jumper seems similar to one in myHioki 7020only split to 2 jumpers.
Exact Model 507 Lin/Log Sweep Function Generator - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: June 17, 2023, 12:37:09 am
content: Hello,I am looking for the manual for an Exact Model 507 Lin/Log Sweep Function Generator. Schematic diagrams and calibration procedures would be great. Thanks!

author: DRL
author_rank: Newbie
timestamp: June 18, 2023, 04:24:58 am
content: Not the same model, but it might be close enough to help you:https://www.eevblog.com/forum/repair/exact-electronics-model-516-functiongenerator-schematics/] https://www.eevblog.com/forum/repair/exact-electronics-model-516-functiongenerator-schematics/

author: Axtman
author_rank: Regular Contributor
timestamp: June 19, 2023, 04:37:02 pm
content: That link is blocked. But I did a search on keywords and found the discussion thread. Thanks!

author: Nchannelmosfet
author_rank: Contributor
timestamp: February 04, 2024, 04:45:01 pm
content: Did you have any luck finding the manual? I have been searching for years without any progress.

author: edavid
author_rank: Super Contributor
timestamp: February 04, 2024, 06:00:18 pm
content: Quote from: Nchannelmosfet on February 04, 2024, 04:45:01 pmHere is one on eBay, maybe they can ship to you:https://www.ebay.co.uk/itm/115964424391

author: Nchannelmosfet
author_rank: Contributor
timestamp: February 04, 2024, 06:39:32 pm
content: Ah, interesting. I have never bought a service manual on eBay before. The price is ok but the shipping cost is a bit high. Plus, I will have to pay an import tax too. I wish there was a digital version. Thanks for your reply and the link.
Case for Brymen 786 - Page 1
Forum section: electronics / testgear

author: Corner
author_rank: Regular Contributor
timestamp: February 04, 2024, 06:41:11 am
content: Hi guys, I'm buying the 786 meter and was wondering if it fits comfortably in the EEVBlog BM235 case?If not, what's a good case for it?Thanks!

author: J-R
author_rank: Super Contributor
timestamp: February 04, 2024, 09:07:04 am
content: Do you mean the actual original BM235 case or the 121GW case Dave currently sells for both the 121GW and the BM235 listed here:https://eevblog.store/products/bm235-121gw-caseIt for sure does not fit into the original BM235 case.Officially, it doesn't fit in the 121GW case per Dave's listing. Unofficially it fits in an acceptable manner in my tests. But you can still tell it's not a match made in heaven.Here is the red Brymen-branded case for the BM-78x:https://www.welectron.com/Brymen-BMP-78x-Carrying-Pouch
Accuracy spec. interpretation - Page 1
Forum section: electronics / testgear

author: Karel
author_rank: Super Contributor
timestamp: February 06, 2024, 11:35:27 am
content: Hi everybody,I need to check a DC voltage in the mV range with a Keysight 34461A.The DC voltages produced by the DUT are: -2, -1, 0, 1 and 2 mV.The accuracy of the DMM is 0.0065 % of reading plus 0.0035 % of range (100 mV, it's the lowest range available on the DMM).Unfortunately, 0.0065 % of 100 mV is too much inaccuracy.Because I'm only interested in the relative accuracy (the step difference between the different output voltages),may I ignore the accuracy specified for the range and apply only accuracy specified for the reading?Is my assumption that the accuracy specified for the range is related to DC-offset errors only, wrong?To give an example:I measure the values with the output of the DUT at 1 mV and at 0 mV.Can I assume the accuracy is (0.0065 x 2) percent of thedifferenceof the two measured values?
BK Precision 2831E Input Resistor Repair - Page 1
Forum section: electronics / testgear

author: apex_seals
author_rank: Newbie
timestamp: February 02, 2024, 10:19:59 pm
content: All,I just bought a busted BK 2831E on Ebay. Looks like the PO exceeded the input voltage rating and burned up a high-precision metal film resistor. It's burned up so bad that I can't read one of the color bands...Everything around it checks out OK - no high resistances, no blown caps, no burnt traces, etc. Unit boots and operates fine other than this input resistor.As I can't find a service manual for the thing... anybody mind sending a pic of the inside of their unit so I can see the color bands? It's the three blue 1W metal film resistors up by the input terminals. Measured values would be even betterThanks!

author: Kean
author_rank: Unknown
timestamp: February 04, 2024, 12:27:18 am
content: In my 2831E- R101 and R102 are brown-black-black-orange/brown - so 100k 1%- R103 is brown-black-black-brown/brown - so 1k 1%Values confirmed by measurement. I think they are 3W parts.I had to do a repair on mine to fix a short in one of the PT6311 VFD driver ICs (bought as faulty). That caused R203 to burn, so after fixing the short I replaced R203 with with a 100R 1206.