hybridfree/eevblog-posts huggingface dataset:
HP 8591a spectrum analyzer problem  - Page 1
Forum section: electronics / testgear

author: kc8ard
author_rank: Contributor
timestamp: March 26, 2018, 07:13:05 pm
content: I can post some pictures later tonight, but last night when I turned on my spectrum analyzer I found a wall of junk from 9khz to about 7.5mhz. past 7.5mhz, the SA operates normally. The noise floor is normal, but when I tune up and down from about 1mhz to 7.5mhz, the noise will come and go. It's not really broadband noise, but a series of peaks that look like garbage. It's strange and I have no idea where to start looking, though I'm pouring over the service manual now.

author: kc8ard
author_rank: Contributor
timestamp: March 26, 2018, 10:09:33 pm
content: Here are the pictures. The last thing I did was just look at the vswr of a alpha delta 40m dipole through a minicircuits zfdc-20-5+ directional coupler.

author: Marcel G
author_rank: Contributor
timestamp: March 28, 2018, 11:56:09 am
content: Mixer damage.See my post and pictures about the Advantest R3131 Spectrum Analyzer (last pages).

author: kc8ard
author_rank: Contributor
timestamp: March 28, 2018, 04:05:09 pm
content: Quote from: Marcel G on March 28, 2018, 11:56:09 amThat's my first thought, that it's the A4 first converter board. It's the first signal path, past the attenuator, starting with a 1.8ghz low pass filter section. Luckily, I found a board pretty cheap on fleapay. If it's not the problem, i'll just have a spare board.The weird part about all of this is that it passes both the conf test and all cal tests. If i inject a signal anywhere within that range, it shows cleanly, but, the spurs are still there. I'll have to tear the board out and look at it when I get the chance. It looks like there is a ton of work(and screws) just to get to the section.One of my thoughts is that it could be the reference pll, contained within the a25 counterlock board, as it outputs a 7.5mhz reference. My problem abruptly stops at 7.5mhz, and all of the spurs occur on both sides of the reference signal.

author: Aleksa
author_rank: Newbie
timestamp: October 22, 2018, 02:51:19 am
content: Did you find out what the problem is? I have the exact same problem. Mine doesn't go through self cal, always fails. The cal output signal is -32db(so it says, don't have a way to confirm it).

author: Henrycarra
author_rank: Newbie
timestamp: April 14, 2022, 01:26:13 am
content: Hi KC, did you finally repaired the HP8591A/ What was the problemI have one with the same noise below 7.5MHzThanks for your time, Henrycarra
HM400 Oscilloscope Service Manual? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 22, 2021, 04:55:00 pm
content: Hi!Does anybody know whether a service manual for the R&S/Hameg HM400 Analogue Oscilloscope can be obtained anywhere?This is a modern model, one of the last Hameg CRT types with push–button microprocessor control of functions and has a ring of green LEDs round each attenuator/TB control knob to indicate the setting.It is a basic analogue model with no digital storage facilities, just the usual Hameg Component Tester is fitted as standard.Needless to say, R & S ignored my enquiry!I can upload a photo when I'm back at work Tuesday if needed.Chris Williams

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: May 24, 2021, 01:59:51 am
content: Let me see what I can come up with.-Rich

author: Oly Music
author_rank: Newbie
timestamp: December 07, 2021, 08:38:37 pm
content: I'm very interesting for service manual too...

author: sisstem
author_rank: Newbie
timestamp: April 07, 2022, 12:53:47 pm
content: hI,service manual for the Hameg HM400 Analogue Oscilloscope can be obtained anywhere?

author: firewalker
author_rank: Super Contributor
timestamp: April 08, 2022, 12:42:01 pm
content: Quote from: sisstem on April 07, 2022, 12:53:47 pmSend an email to Hameg (support@hameg.com). When I asked the service manual for my HM-605 they send it to me.Alexander.

author: sisstem
author_rank: Newbie
timestamp: April 13, 2022, 08:45:38 pm
content: european agents do not provide service manual
Anyone using ET5301 electronic load ? - Page 1
Forum section: electronics / testgear

author: jusanother
author_rank: Contributor
timestamp: April 13, 2022, 12:44:27 pm
content: Looking for anyone with experiance of using the East Tester ET5301 electronic load. It's similar to the usual suspects East Tester ET5410, Korad KEL-103, DingChen DCL6104, etc.Has a few variants:ET5300 400W 150V 40AET5301 400W 150V 60AET5303 400W 500V 30AET5304 2x200W 150V 2x30ALooks to have a useful rear panel, RS232, USB, and possibly remote voltage sense but hard to tell from the AliExpress listings.Also if anyone could confirm what the signals on the terminal block are, they are labelled S1+ S1- R1 P1 F1 N1 G. Also has a BNC labelled OUT1.EDIT this looks like the manual even though it says ET13 series, and it does indeed have remote sense.https://www.easttester-cn.com/uploads/ET13-Programmable-Bentop-DC-Electronic-Load-User-Manual.pdf

author: jusanother
author_rank: Contributor
timestamp: April 13, 2022, 01:31:31 pm
content: Manual.
Keysight U1733C LCR software update - Page 1
Forum section: electronics / testgear

author: Grandchuck
author_rank: Super Contributor
timestamp: June 29, 2020, 05:36:09 pm
content: 2020-06-22 Ver. 3.07Update to fix incorrect resistance measurement value (DCR) when measuring <7MΩ at 20MΩ range – issue presents in version 3.06.Available for download

author: TheSteve
author_rank: Unknown
timestamp: June 29, 2020, 08:12:48 pm
content: Be aware this update only applies to a limited range of serial numbers(and that appears it is newer units).U1731C, serial number above MY55200000 allowed to perform firmware update to version 3.07.U1732C, serial number above MY55240000 allowed to perform firmware update to version 3.07.U1733C, serial number above MY55220000 allowed to perform firmware update to version 3.07.Edit - Just wanted to add that my U1733C updated without issue. It had firmware version 00.28 and now reports as firmware 03.07.I know years ago when people updated the U173xC series some seemed to brick, the update disappeared off the website a while later.If you do perform the update I'd make sure your PC isn't running much in the background during the process (it takes under a minute).

author: sjl
author_rank: Newbie
timestamp: April 13, 2022, 03:17:48 am
content: I'm having trouble finding a download for the 3.07 firmware, does anyone know where these are hosted online?The Keysight page for the U1733C only shows the GUI logger under available software/firmware

author: TheSteve
author_rank: Unknown
timestamp: April 13, 2022, 04:21:27 am
content: It looks like it was removed from the website again - maybe people bricked meters with this update too?I checked and I still have the update .zip file. It is 13 megabytes but if it might brick machines I don't know if I should post it publicly.

author: sjl
author_rank: Newbie
timestamp: April 13, 2022, 05:04:33 am
content: Thanks for your reply, turns out I'm on version 3.06.Probably not worth the risk to update anyway only for that resistance bug at the top end range
HP/Agilent 1250-1499 Reference Connector substitute? And or specs? - Page 1
Forum section: electronics / testgear

author: saber63
author_rank: Newbie
timestamp: October 06, 2015, 11:46:27 pm
content: Hello all! I picked up a HP3325A (thanks to to the advice of this forum!). It came with the the Oven option, but not the HP 1250-1499 adapter to connect and use it!Currently these are rather pricey (compared to the price of the unit)Are these standard 50ohm coaxial connections? Such that i could grab a short piece of cable? Or is it more complicated than that?Thanks!-Levi

author: VK5RC
author_rank: Unknown
timestamp: October 07, 2015, 03:28:03 am
content: I think one of my older vintage HP needed a similar link, I am pretty sure I replaced it with a short 50 ohm bnc cable.

author: saber63
author_rank: Newbie
timestamp: October 22, 2015, 06:45:29 am
content: Sorry for the late update, bussy setting up!Wanted to confirm that a 50ohm coax cable worked a treat!Thanks-Levi

author: VK5RC
author_rank: Unknown
timestamp: October 22, 2015, 10:36:28 am
content: Yup! In fact I brought the junction out to the front of the machine, so I could connect a GPSDO if I wanted to get all fancy. It was a 3586C if I recall correctly, I can't check easily as it on the bottom of a stack of similar weighty HP machines.

author: rfted
author_rank: Newbie
timestamp: April 11, 2022, 11:49:22 pm
content: I know that this is an old topic but it appeared in my search for the 1250-1499 jumper for my HP8595 Spectrum Analyzer.What I found was that you can use a couple of right hand BNC M/F adapters and a BNC M/M barrel adapter and get the jumper you need. You will be able to set your unit on its end. Just make sure to align the alignment tabs and carefully push the unit in a bit at a time.Those guys in Santa Rosa must have had to wait for the final component to be made so they made the distance between the connectors to match this arrangement or they recognized that the jumper could/would be lost if the unit was connected to a 10MHz lab reference.

author: Tony_G
author_rank: Super Contributor
timestamp: April 12, 2022, 10:27:06 pm
content: Nice - Wouldn't have thought of that.I've also seen a bunch of gear just using something like the HP 10502A, which is just a short BNC cable (6-8" I think)TonyG

author: TheSteve
author_rank: Unknown
timestamp: April 12, 2022, 11:11:28 pm
content: Not all right angle adapters are the same dimensions - so you may need to experiment to find the proper fit.
HOPI  HP9800  is this still a reasonable power meter - Page 1
Forum section: electronics / testgear

author: johnh
author_rank: Regular Contributor
timestamp: March 06, 2022, 12:30:11 am
content: Is the HOPI HP9800 still the best bang for buck power meter?Mainly interested in how much power an instrument/appliance is drawing.

author: Tjuurko
author_rank: Regular Contributor
timestamp: March 06, 2022, 03:35:11 pm
content: You can look at this manufacturer:https://aliexpress.com/store/427884

author: impetus_maximus
author_rank: Contributor
timestamp: April 12, 2022, 07:12:37 pm
content: Quote from: Tjuurko on March 06, 2022, 03:35:11 pmthanks for that. i founda poston why to avoid the HOPI units, but doesn't state which to use instead.tried to ask there, but they are rejecting new users. it's a shame, because i like the HOPI display better than other meters i've seen.are the ZHURUI meters any more accurate? there is also no included 'deathdapter'.i see UNI-T makes a meter, but the display is a bit limited.
Real-Time Curve Tracing on Keysight Scope - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: April 12, 2022, 12:57:41 pm
content: While usefulness of curve tracing is limited, the curve tracing is a lot of fun.Attached XY_infPersist_hiRes.pngshows one of the screenshots oflive traces on Keysight scope DSOX1102G in XY mode.The curves were obtained using floating scope and grounded two-channel Rigol DG1102Zwaveform generator.The scope ground was connected to drain of the J113 jfet,scope Ch1 to the Rigol ground,and the scope Ch2 to the Rigol Ch2 output providing symmetric triangular signal.Gate of the J133 was connected to the Rigol Ch1 output providing 8-step signal.The Waveform Gen settings can be seen on the attached screenshotsrigolGenCh1.png and rigolGenCh2.png.Approximate schematics of the setup is shown on LTspice jfetCurveTrace_realTime.asc,where capacitor C1 describes stray capacitance between Keysight and Rigol grounds.LT simulation results are shown onLTsimCurves.pngDrain_source voltage and the drain current measurement resistor voltage areshown as functions of time onthe scope screenshot drain_sourceV_resistorV_vsTime.Gate voltage (Rigol Ch1) and Rigol Triangular pulses (Ch2 output) are shownas a function of time on gateV_RigolTriangV_vsTime.png.In normal XY Keysight mode the traces are bright, but too noisy, as shown onnormalXYcurves.png.Unfortunately, Keysight XY mode is not compatible with Average mode.Fortunately, it is compatible with HiRes mode. Unfortunately, in HiRes modethe traces are dim, as can be seen on HiResXYcurves.png.Improved image can be obtained by combining HiRes mode with Infinite persistence, asshown on XY_infPersist_hiRes.png.More careful examination of the curves shows that each gate voltage curveactually consists of two slightly separated curves.This is due to the stray capacitance between the scope and the Wave Gen grounds,as can be verified by LT simulation changing the value of C1.The true curve should be average of these two slightly separated curves.This small separation can be further decreased by reducing Wave Gen frequencies.
HP/Agilent/Keysight half rack form factor meters and instruments - Page 1
Forum section: electronics / testgear

author: pizzigri
author_rank: Regular Contributor
timestamp: April 13, 2022, 02:34:46 pm
content: I'm not too sure this is the right place to post this, but I searched both the Web and the forum and could not find a definite answer.HP came up with a half rack form factor for its meters and instruments, of which the most famous examples are the 34401A, 53131A and 35120A instruments.They all have in common the aluminum body, of various lengths, the bezel and VFD digits, and the rubber bumpers and handle. This form factor continued in such instruments as the 34410 and the E3641A, also a double height but still half rack version of it mostly for power supplies, such as the E3631A, was introduced.So my question is, where can I find a complete list of all the meters, PS, instruments etc that follow this form factor and share the "family feeling"?Thank you!franco

author: JDubU
author_rank: Frequent Contributor
timestamp: April 13, 2022, 02:42:44 pm
content: Maybe this?https://www.keysight.com/us/en/assets/7018-03007/technical-overviews/5990-8190.pdf

author: pqass
author_rank: Super Contributor
timestamp: April 13, 2022, 03:00:11 pm
content: Check some of the later '90s catalogs here:http://hparchive.com/hp_catalogsYou'll get a definitive list by model and writeup on each new product for that year.

author: pizzigri
author_rank: Regular Contributor
timestamp: April 13, 2022, 03:04:19 pm
content: JDuBu, well...it is a BIG help, in the sense that it features basically ALL of the instruments that are rack mountable from Keysight, but that includesall of them, in every module size.I mean, things like the 54832B which is not exactly based on the form factor of the 34401....with a little bit of patience I can check out all the unfamiliar instrument numbers and see from an image search which ones are based on the mentioned form factor - so lots of work, but, OTOH, since I was not aware of this documet existing, still big kudos to you.

author: pizzigri
author_rank: Regular Contributor
timestamp: April 13, 2022, 03:05:40 pm
content: And pqass,that helps too - a lot actually! Thank you guys!
Looking for feedback on Hanmatek HM310T Power Supply - Page 1
Forum section: electronics / testgear

author: bkshir
author_rank: Newbie
timestamp: March 01, 2022, 04:36:25 am
content: Hello,I have been looking around for a 30v 10a PSU and have narrowed my choices down to a few which include the Hanmatek HM310T. There is one good thread on here with teardown pics and a lot of good information, but I haven't found much information regarding the actual performance and longevity of this actual model. Can anyone give some feedback on this unit after owning it for a period of time?Thanks in advance,Bill

author: Grandchuck
author_rank: Super Contributor
timestamp: March 01, 2022, 06:12:09 pm
content: This unit has a number of failures reported on Amazon.

author: bkshir
author_rank: Newbie
timestamp: March 01, 2022, 10:03:15 pm
content: Quote from: Grandchuck on March 01, 2022, 06:12:09 pmThank you Grandchuck,I had read reviews on Amazon and although it gets a pretty good 4.6 stars on average, the reported failures are a concern.I also noticed that the reviews are a mixture of reviews from 3 different models referred to as 30V5V, 30V10A, and Programmable. This is a little misleading since 2 of them are actually 30V 10A PSUs, but only the reviews labeled as "Programmable" actually refer to this model. The only 1 star ratings I saw for this actual unit were referring to 110v vs 220v input and issues with the software for the unit.I trust more of what I read on eevblog than on Amazon anyway so I thought I would come here for any additional input I could get. I like that this PSU is programmable with memory functions and that the current can be set without a load or shorting the leads. If anyone has any recommendations for other units that offer these same features for a comparable price (~$100), I would welcome that input too. Thanks again for the reply.Bill

author: sx3tec
author_rank: Newbie
timestamp: April 11, 2022, 05:07:36 pm
content: Greetings to all!I found this post looking for information on the Hanmatek HM310T.like the companion, it was my option to buy, but these comments about the failures in the device have changed my mind.Could you please tell me about these faults found?Thanks in advance..!!
DM3058 Run/Hold - Page 1
Forum section: electronics / testgear

author: boful
author_rank: Contributor
timestamp: April 11, 2022, 09:40:54 am
content: Greetings..Rigol DM3058I have been trying to use the RUN/HOLD option without any luck. Looking at the manuals description and instructions, should be similar to Flukes 'Touch Hold' function.Have had no luck having any measured value remaining on the display once test leads are removed.Just feels like operator error :-)Any suggestions on how this function should work, sure seem like it would be simple.Thanks

author: hexreader
author_rank: Frequent Contributor
timestamp: April 11, 2022, 01:14:28 pm
content: The "single" button probably does what you want.

author: 2N3055
author_rank: Super Contributor
timestamp: April 11, 2022, 02:34:52 pm
content: Read the manual. Keyword here is trigger.
Rohde and Schwarz GLORIS Account? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: April 11, 2022, 02:33:37 pm
content: Hi!What's the current score on Rohde and Schwarz GLORIS accounts?Would I be able to register for a GLORIS account in my own name by quoting the serial number either from the R & S SMIQ03Bincomplete unit I have, or if I was to buy another piece of R & S gear?Would R & S stick two fingers up at me if I tried registering for one? I ask in the hope that there might be a bit more information available "from the horse's mouth" as it were!I have just found there is more information besides circuits and layouts missing from the SMIQ service manuals, there is also parts lists and XY lists missing from many of the boards as well!What wassock made such an atrocious job of scanning all these R & S manuals with so much left out of them?The more I look in these books, the more I feel inclined to break this unit up and flog the parts on eBay and use whatever I can get towards a Farnell or Marconi signal generator that does have full information available!Chris Williams
Keithley 2450 CC/CV charging and discharging - Page 1
Forum section: electronics / testgear

author: justanothername
author_rank: Regular Contributor
timestamp: November 29, 2021, 07:03:06 pm
content: Hi.I'm recently verifying the performance of a fuel gauge (see attached picture) and I wanted to share with you a script (also attached) that I wrote for the Keithley 2450 SMU.You can charge or discharge a lithium battery in CC/CV mode, the script does this, and counts mAh (charge - that would be coulombs if it is As).The idea is that if you have a fairly big battery, say 1000mAh but you want to use it with a small load let's say 10mA, you can't measure the batterys capacity by discharging with a high current since you will get a wrong discharge curve. You will reach the cutoff voltage to soon, see:https://batteryuniversity.com/article/bu-501a-discharge-characteristics-of-li-ionOn the other hand, discharging with 10mA takes forever.The attached script helps.Example: You have a 1000mA battery, you use a linear regulator with 3.3V and 100mV drop, so your cutoff voltage will be 3.4V. Your device uses 10mA constantly.You start the script and set:* Voltage to 3.4V* current limit to 500mA (this is safe, since it is 1/2 C)* charge end current 10mAThe battery will discharge at first with 500mA. Then eventually goes into CV mode, when the SoC falls and the internal resistance rises. It stops discharging when you can get no more than 10mA out of the cell without dropping below 3.4V. Then you can read the registered capacity in mAh. For charging, its the same but with 4.2V (for 1S lithium battery) and a smaller end current (maybe 1mA?).Rename the attached .txt file to .tsp

author: justanothername
author_rank: Regular Contributor
timestamp: April 10, 2022, 07:38:09 pm
content: Hi All!I did some improvements to this script and wrote a documentation for it.You can get it in my github:https://github.com/dotmjsc/K2450_CC_CVM.
Cal Test CT4200 Series (CT4203) passive oscilloscope probe thoughts? - Page 1
Forum section: electronics / testgear

author: matthuszagh
author_rank: Frequent Contributor
timestamp: April 10, 2022, 05:52:35 pm
content: I'm in the market for good, general-purpose, 10x passive oscilloscope probes that aren't going to cost me an arm and a leg. In my search I came across the CT4203 (https://www.digikey.com/en/products/detail/cal-test-electronics/CT4203/9645860) and other probes in that series. They look quite nice for the price. They have good bandwidth and come with a lot of accessories. In particular, a number of different IC probe caps are included, down to 0.5mm pitch. These make it much easier to probe fine-pitch SMD parts. Does anyone have experience with these probes? Any thoughts?I'd also be interested to hear about any other good 10x passive probes that people like.

author: Weston
author_rank: Regular Contributor
timestamp: April 10, 2022, 06:37:44 pm
content: I have not personally used them, but the CT4200 probes seem to be a lower quality copy of the PMK 2.5mm probe line (https://www.pmk.de/en/products/2_5_mm_tastkoepfe) which is rebranded by several companies.The external accessories should be compatible but the tips do not seem to be compatible. Also, the capacitance of the CT4200 probes seems to be higher and the injection molding quality looks lower.I have used the PMK rebranded 2.5mm probes and can recommend them.The PMK 2.5mm probes are rebranded and sold by Agilent, R&S, and Picoscope, amongst others. I think the picoscope one is the cheapest (but sometimes the R&S or Agilent probes can be found used on ebay for cheap). It might be worth the price differentialhttps://www.picotech.com/accessories/standard-passive-probes/500-mhz-scope-probe
KORAD KA3005P display schematic errors - Page 1
Forum section: electronics / testgear

author: MikeK
author_rank: Super Contributor
timestamp: April 10, 2022, 01:29:10 am
content: See the attached image.It's obvious that the shift register is labeled wrong, should be 74HC595. And the NPN symbols are upside-down. The display drive resistors seem undersized for what the shift register can source.But what are D1-D10 for?! I haven't pulled my board to see if they're there, but I can't see a purpose for them.Mike

author: tooki
author_rank: Super Contributor
timestamp: April 10, 2022, 02:00:19 am
content: Ummm… the 10 LEDs on the front panel? Just to the right of the two displays.

author: MikeK
author_rank: Super Contributor
timestamp: April 10, 2022, 02:04:49 am
content: Oh.

author: pqass
author_rank: Super Contributor
timestamp: April 10, 2022, 04:15:51 am
content: D4,D7-10 have cathodes grounded AND tied to Q7 emitter! Cathodes should just be attached to Q7 collector.D1-3,D5,D6 have cathodes grounded so they're always flickering! Likely should just be attached to Q7 collector too.What a horrible mess.

author: TurboTom
author_rank: Super Contributor
timestamp: April 10, 2022, 07:06:35 am
content: The transistors could also be PNP versions if the direction of the emitter arrow (and the designation) is wrong but the connection is correct. This would alter the drive polarity.

author: mawyatt
author_rank: Super Contributor
timestamp: April 10, 2022, 02:18:51 pm
content: An old trick from way back to get very low "ON" saturation voltage was to "invert" the NPN transistor, so the E now becomes the inverted C, and the C now the inverted E. This works because the B-E junction is more heavily doped than the B-C junction, but also limits the voltage use range to usually 5 volts or less.Anyway, wonder if this is what's going onBest,

author: MikeK
author_rank: Super Contributor
timestamp: April 10, 2022, 03:19:05 pm
content: Quote from: mawyatt on April 10, 2022, 02:18:51 pmInteresting. I'm going to have to test this. And break open the KORAD to look; I just assumed it was typical bad documentation.

author: mawyatt
author_rank: Super Contributor
timestamp: April 10, 2022, 03:42:51 pm
content: Quote from: MikeK on April 10, 2022, 03:19:05 pmWe used this inverted NPN "trick" before low Rdson MOSFETs became available, and didn't have a negative supply for JFET use. Recall an old pulse-use NPN had the best performance, but can't remember the partEdit: Think it was a 2N2369.Should work with 2N3904 tho, just wouldn't have the lowest saturation voltage.Best,
Fan noise of Wavesurfer 4000HD - Page 1
Forum section: electronics / testgear

author: Domitronic
author_rank: Regular Contributor
timestamp: April 08, 2022, 07:59:21 pm
content: Hello,since the availability of a loaner is limited right now i thought i just ask here about the fan noise of the LeCroy Wavesurfer 4000HD series. Can anybody compare them to other devices?For me Tektronix (Series 3 and 4) and R&S (RTB and RTM) are quite acceptable while Siglent SDS1104X-E and SDS2104X plus are somehow annoying. Those are the devices i'm familar with. So if somebody could compare the fan noise of the LeCroy with one of them it would be helpful.BR

author: Martin72
author_rank: Super Contributor
timestamp: April 08, 2022, 08:21:46 pm
content: Hi,We own a WS3000, it´s fan is controlled, so it´s relatively quiet - quieter than the siglents you´ve mentioned(they don´t got fan control).I´m pretty sure, the fan in the WS4000HD will be controlled also.Martin

author: Domitronic
author_rank: Regular Contributor
timestamp: April 09, 2022, 05:01:25 pm
content: Thanks, that sounds promising. I'm afraid because i remember in my former job 10-12 years ago there was a LeCroy which nobody wanted to use because it was loud as a vacuum cleaner. Hopefully this is much better today.

author: Martin72
author_rank: Super Contributor
timestamp: April 09, 2022, 07:24:20 pm
content: QuoteLOL...I know it´s name...12...14yrs ago we bought three of them, because they were so handy.We still got them and you can hear it through the whole lab, when someone turns one on.And the model name is program:WaveJET, no joke....

author: Sighound36
author_rank: Frequent Contributor
timestamp: April 10, 2022, 03:42:03 pm
content: Very quiet no issues at all we have three of them good as gold
Used DSO gear market & prices - Page 1
Forum section: electronics / testgear

author: hpw
author_rank: Frequent Contributor
timestamp: April 10, 2022, 08:31:47 am
content: As I was looking for a faster DSO as 20G/s and even more, I am come to the conclusions:. all are HEAVY overpriced. Almost no production year given even asking for a quote. Almost no probes included. Unknown state about replacement parts as it gets soon terrible expensive. Capacitor as after 10 yearsor burning CPU'sIn other words, about the price calculation, I expect a "depreciation rate" for each year as on company cars market...One could blamed by calibrated gear, for sure, the real MTBF after years will count and looks like a "Black Cat" purchase...So no real used bargain on earthSo at the end of the day, renting would be a solution, but shipping & return over boarders / Customs would be an other pain.

author: Fungus
author_rank: Super Contributor
timestamp: April 10, 2022, 09:02:03 am
content: Yes

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 10, 2022, 02:23:49 pm
content: Yes... the mourning thread of the year... please replace "DSO" with "Anything"... as the mourning applies to almost Anything...

author: bdunham7
author_rank: Super Contributor
timestamp: April 10, 2022, 03:00:21 pm
content: Quote from: hpw on April 10, 2022, 08:31:47 amThe price per unit of performance of DSOs seems to drop over the years, so the old, used DSO at a given performance level would have been even more expensive new than an equivalent model today. The prices you are seeing are quite depreciated--but the risk is also high. A good new scope for you might be the Tek MSO68B. Nicely configured with extra memory and 25GSa/s on 4 channels (half that onit would run you $135,000 - $180,000 or so. That includes nice 1GHz passive probes.A (very) roughly equivalent scope in old, used inventory might be a 10-12 year old Agilent Infiniium DSO80000 series. These can be had in working condition with nominal warranties from used equipment dealers for $10-15k. I don't know what they cost new, but I'm pretty sure the depreciation in percentage is a lot more than my 12 year old car.
Firmware update for the Atten ADS1102C... any hints? - Page 1
Forum section: electronics / testgear

author: Davy Bartoloni
author_rank: Newbie
timestamp: April 10, 2022, 07:48:10 am
content: Hi, i have this old DSO, and 2 years ago i come to the forum and i saw this:https://www.eevblog.com/forum/testgear/atten-ads1102cml-100mhz-oscilloscope-new-firmware/suggesting to use a "siglent/lecroy" firmware but for what i can see the firmware for something like the ADS1102C is not available. (maybe siglent model has a different name)thank you in advance for any help
looking for the lecroy LS140 service manual - Page 1
Forum section: electronics / testgear

author: ihackthestate
author_rank: Newbie
timestamp: April 09, 2022, 01:23:28 pm
content: Hi! I've looked far and wide for the service manual of the lecroy LS140 scopestation service manual to no success. Does anyone have a copy?

author: alm
author_rank: Super Contributor
timestamp: April 09, 2022, 01:51:27 pm
content: I assume you already found theschematics(I believe the same are availablehere)?

author: ihackthestate
author_rank: Newbie
timestamp: April 10, 2022, 12:45:17 pm
content: Yea (thanks for looking tho), I had even emailed lecroy and they quite nicely found the same link for me. I've seen people talking about the service manual in the past but have never been able to find one.

author: alm
author_rank: Super Contributor
timestamp: April 10, 2022, 02:23:28 pm
content: I notice that Dave has "schematics: yes" for the 2 volume LS-140 sethere. There's 95% chance this is a mistake, but it doesn't hurt to ask. He might have a source, and worst case you help him fix an error on his site

author: ihackthestate
author_rank: Newbie
timestamp: April 10, 2022, 08:36:01 pm
content: Will do, thanks. I'm also looking for the firmware on the ROM-DOS ISA card for the more expensive L1 version. I'm currently just hoping that the motherboard replace I'm doing will be good enough to run the L1s software. The ROM-DOS on that PROM I've managed to dump doesn't seem to contain any info relating to the option and it might just be a different boot screen picture. Some testing will confirm this.If you know any way I can get the memory on the part number: 205-913-010 PROM please let me know, or if anyone has an L1 version and is willing to perform a dump or sell it to me.
ConsoleCast Open source Serial to WIFI adapter (SCPI etc) - Page 1
Forum section: electronics / testgear

author: ploegmma
author_rank: Newbie
timestamp: April 09, 2022, 01:22:06 pm
content: Maybe interesting for people that would like to interface with their lab equipment wirelessly. You can use Python or even JS directly from a browser to talk (SCPI) to equipment having an RS232 or USB port. No special drivers or other software needed. The advantage of using JS from the browser is that it's extremely easy to build custom UI's for your tasks. Here's an example for the XDM2041 multimeter:https://github.com/majodi/consolecast/tree/master/main/exampleFor more info see:https://consolecast.nickstick.nl/
Keysight 2000 Series - Eye Test Files - Page 1
Forum section: electronics / testgear

author: snx
author_rank: Contributor
timestamp: April 11, 2022, 07:51:21 am
content: My goal is to create a custom eye test mask for my MSOX2024A Oscilloscope. Currently, I struggle to understand the structure of the file and the relation of the parameters.When I load the preset from the "ARINC249" mask template without the "Setup" part, which means my scope is on default setting when started. I get displayed a mask that looks correct. But I currently don't really understand the references on the files.For example in the Mask file, the poligons are defined like this:QuoteRegion 1 and 3 are the Bottom/Top limits and the Region 2 is the diamond-shaped eye.When I look at the first entry (red), it's obvious that "max" means max voltage since this is easy to spot from the diagram. The 0.0000 seems the time starting point (x-axis). But on the default setting, this seems not 0.0 on X-axis, but some uS away from the zero position.When I look at the second entry (green), these seem to define the minimum voltage area. On the screen, I tried to measure and reference the values with a cursor, and it seems that the reference is at -3.0V and has a span of 6V because if I set the values of 0.5781 and 0.4219 to 0.00 and 1.00, they appear on -3V and 3V.Is there any explanation or tutorial on how which scopes do interpret which values and where the absolute reference is?

author: MarkL
author_rank: Unknown
timestamp: April 11, 2022, 01:59:54 pm
content: There's a whole chapter in the user manual dedicated to mask testing and the format of the mask files:https://www.keysight.com/us/en/assets/9018-03426/user-manuals/9018-03426.pdfSee pages 227 - 239.
Hioki IM3536 - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: March 25, 2022, 02:15:27 pm
content: Does anyone have the Hioki IM3536 LCR meter? If so, how does the instrument "fan noise" compare with other lab instruments?Thanks in advance.Best,

author: Thundr_Pat
author_rank: Newbie
timestamp: April 07, 2022, 08:43:07 pm
content: I recently started using a Hioki IM3536. There is certainly a noticeable noise, but it has not been very distracting for me.I am curious how loud the LCR is. Perhaps I will borrow a calibrated dB meter and find some data for us.I will update with my findings!

author: mawyatt
author_rank: Super Contributor
timestamp: April 07, 2022, 09:21:10 pm
content: Ours is much much louder than anything in our lab, significantly outpacing a pair of Siglent SDS2104X+ which many consider to be on the fan loud side, and our Tonghui TH2830 sounds like a whisper compared to the Hioki!!We did contact Hioki and they were responsive, and compared a video we sent to a IM3536 in their lab in Texas. The result was that one in the Hioki lab produced a similar fan noise.Best,
Fluke 8x V series DMM safety issue  - Page 1
Forum section: electronics / testgear

author: viperidae
author_rank: Frequent Contributor
timestamp: April 06, 2022, 01:00:19 am
content: Got a notification at work today about a safety issue with Fluke Meyershttps://www.fluke.com/en-ie/support/safety-notices/8x-v-safety-noticeLooks like a batch of meters may have a defect with the plastic molding around the COM terminal.

author: AVGresponding
author_rank: Super Contributor
timestamp: April 06, 2022, 06:00:45 am
content: Pretty sure we had a thread on this when it (the safety bulletin) was first released.

author: floobydust
author_rank: Super Contributor
timestamp: April 06, 2022, 06:20:47 pm
content: Thanks for letting us know. The alert mentions affected 83V, 87V and 88V with manufacturing dates: June 7, 2019 – August 26, 2021 and Serial numbers 46280001-55370001. Two years worth I guess.I wonder if it's related to Fortive "changing vendors" on the input jack assembly, the body colour changed from red to grey and it caused ashitstormand there is a black body part as well.One of them may have a quality issue and it takes two years to notice

author: AVGresponding
author_rank: Super Contributor
timestamp: April 06, 2022, 07:35:55 pm
content: I was correct, we've had this before. Perhaps the mods could merge these threads?https://www.eevblog.com/forum/testgear/fluke-8x-safety-issue-recall!/msg4006708/#msg4006708
Python showing long RS232 texts decoded by Keysight scope. - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: April 09, 2022, 12:54:05 am
content: Keysight scopes, such as DSOX1102G with EMBD option, are very good at showing characters oftext which are decoded from RS232 RX or TX signals. Unfortunately, number of decoded charactersvisible on the scope screen at any one time is very limited, about the same as can be seen on the attached screenshot 2mSDiv.pngAt the same time some messages are much longer. For example, standard NMEA messages from GPS receiver include hundreds of characters, and it is desirable to see complete message at once. This screenshot 200mSDiv.pngshows NMEA messages occupying about 350 mS of each 1 sec interval. It also shows that at such scale no decoded characters can be seen, as they are replaced by one blue rectangle.Fortunately, all the decoded data from the waveforms visible on the scope screen can be downloaded to PC using PyVisa.The attached getKSdecodedRS232text_insertAddress.py program downloads decoded text from Keysight scope and shows it on the IDLE output.The screenshot of the outputcan be seen on PythonShowingKSDecodedNMEA.png,The first, short, blue text was obtained from the screen with 2mSDiv.png screenshot.The second, long, blue text was obtained from the screenwith 50mSDiv.png screenshot.It shows full set of messages send by GPS during one second interval.The python program needs small change. One should insert USB address of the scope, which can be found on the scope pageshown atUSB_VISA_address.png.

author: bicycleguy
author_rank: Frequent Contributor
timestamp: April 10, 2022, 03:47:07 pm
content: NiceCrashed for me until added '@py'rm = pyvisa.ResourceManager('@py')
TMK TW-20S Multimeter Schematic - Page 1
Forum section: electronics / testgear

author: UKSimon
author_rank: Newbie
timestamp: April 04, 2022, 08:35:36 pm
content: Hi all, I'm looking for a schematic for the TMK TW-20S multimeter. I bought it off ebay and looks like someone has connected it incorrectly as there are two charred resistors on the range switch. Would be very grateful if someone could send me a copy or suggest a good website to get one. Cheers.Simon
RTB2000 Question:  touchscreen operation with a stylus - Page 1
Forum section: electronics / testgear

author: Frank_MV
author_rank: Regular Contributor
timestamp: February 02, 2022, 04:48:46 pm
content: Hi,I like to operate my RTB2004 with a stylus because it keeps the screen free of fingerprints.Everything works very well, except for the drawing/marking function.All lines have interruptions with pen input - then looks like Morse code ;-)With the finger it goes without problems.Now the question, why does the pen leave interruptions at drawing ?The same pen works on the touchscreen of my smartphone without problems when drawing lines.I use a pen like the one in the attachment, that is with a wide tip.Is there perhaps a pen that is more suitable.Does anyone here have experience ?Thanks,Frank

author: R.J.
author_rank: Contributor
timestamp: February 17, 2022, 11:55:40 am
content: Hallo Frank,I own a RTB2004 for a month of 2 and I just plugged a wireless USB dongle into to front-USB connector so I can use a mouse.I do not want have any fingerprints on the shiny screen and a mouse works very well.Hoping this is a better solution than a stylus pen.R.J.

author: zxbar
author_rank: Newbie
timestamp: April 04, 2022, 07:26:38 pm
content: helloi have mx 100tp how to download firmware
UNI-T UT22B-EU Voltage Tester - Page 1
Forum section: electronics / testgear

author: firewalker
author_rank: Super Contributor
timestamp: April 04, 2022, 04:53:59 pm
content: Recently I was in the need for a voltage tester (for educational demonstration). In the first shop I came across I bought the cheapest known brand one. This was the UNI-T UT22B-EU at 16 euros (~18 USD). As usual I performed a tear down. I was expecting something simpler (for a device with no batteries and the price), but it is more complicated. It even has a discrete microcontroller HY17P48 (https://www.hycontek.com/hy_mcu/DS-HY17P48_EN.pdf).
DSO nano, NMEA firmwares - Page 1
Forum section: electronics / testgear

author: Aleksander
author_rank: Newbie
timestamp: April 04, 2022, 04:33:36 pm
content: Hi.I already have a Seeedstudio DSO nano in my toolbag, mostly used for quick checking of signals for marine electronics without the need to pull out the laptop,I recently discovered that there are some companys selling basically the same unit with a firmware that enables you to monitor the NMEA data and also send some sample data for testing,one version is the Zinnos ZNT-300 and the other is the AMI Marine X300, and there are probably others.Does anybody know if the firmware for one of them, or a custom firmware with similar functions is avaliable?
Beginner - need help, Pendulum CNT-90 USB to Timelab - Page 1
Forum section: electronics / testgear

author: rockwell
author_rank: Regular Contributor
timestamp: March 29, 2022, 05:55:36 pm
content: I recently got a Pendulum CNT-90 equivalent to Tektronix FCA 300 or even Philips PM 6690.My wish was to get my CNT-90 connected via USB to the Timelab software.Tried several things I found on internet, such as installing the NI Visa driver.But never I was able to connect the CNT-90 to TimelabIs there anybody out there who is kind enough to guide me trough the steps necessary to get this working ?

author: nctnico
author_rank: Super Contributor
timestamp: March 31, 2022, 04:06:25 pm
content: The first step would be to use the NI Visa command diagnostics tool to access your CNT-90 (see if the *IDN command returns the device information). You'll need to get that working first. Check for things like GPIB address and so on. Actually, I'm not sure whether Timelab can use NI Visa.Side node: I have bought a Prologix ethernet GPIB adapter that offers a telnet (socket / LXI) connection to equipment. That works just fine with an FCA3100 (CNT-91) and Timelab without needing to mess with NI-Visa. Timelab connects to the Prologix adapter directly over the network.BTW: Timelab has an option to check for the right instrument before starting a measurement. You'll likely need to disable that because your FCA3000 will send a different ID back compared to what Timelab expects.

author: NY2KW
author_rank: Regular Contributor
timestamp: April 04, 2022, 01:47:53 pm
content: I have the Fluke PM6690 (CNT-90) and use the Prologix GPIB-USB adapter with TimeLab.
Proper grounding in KORAD KA3005P? - Page 1
Forum section: electronics / testgear

author: MikeK
author_rank: Super Contributor
timestamp: April 04, 2022, 01:46:26 am
content: I recently watched a YT video (about a different, but similarly cheap, power supply), showing that there was noise in the output due to the way mains and the output were grounded: the mains ground was connected to one side of the transformer base and the earth output was connected to the other side of the transformer base. The guy showed that the noise was significantly reduced by using the same ground point.Curiously, I looked into my KORAD KA3005P. I see that the mains ground is connected to the metal case close to the IEC socket, which is on one side of the transformer. And the earth output is connected to the metal case on the *other* side of the transformer.Isn't this the same situation?...The transformer core is being used in the ground path, and introducing noise?

author: kcbrown
author_rank: Frequent Contributor
timestamp: April 04, 2022, 04:07:26 am
content: Don't see how. The earth terminal on the supply isnotthe same as the negative supply output terminal on the Korad. The negative supply output is floating so that you don't introduce a ground loop by connecting it to some arbitrary portion of your circuit. Unless you connect something to the earth terminal, that side remains open ended. So unless the path through the transformer between mains earth and the earth terminal is acting as an antenna and is somehow introducing noise through coupling within the transformer, it's hard to see how it would result in noise on the output. And in any case, the output side of the transformer goes through all sorts of filtering (including being passed through voltage regulators), so it's not clear how coupled noise from the transformer would land in the output in any case.

author: MikeK
author_rank: Super Contributor
timestamp: April 04, 2022, 12:36:47 pm
content: This is what I'm referring to:
Simple Lab Supply - Page 1
Forum section: electronics / testgear

author: boful
author_rank: Contributor
timestamp: April 04, 2022, 04:01:12 am
content: Greetijngs ..Built a attached power supply kit, to put into an enclosure for a variable voltage supply.Attached is the schematic.No idea how this circuit works, what does Q1 do ? Never seen a circuitlike this with a LM317.Any ideas ?Thanks so much.

author: Ian.M
author_rank: Super Contributor
timestamp: April 04, 2022, 04:52:47 am
content: Its a protection circuit that prevents the output skying (loss of regulation) if the pot wiper looses contact. See my comments athttps://www.eevblog.com/forum/projects/question-about-potentiometer-wiper-failure-in-bench-power-supplies/msg3122004/#msg3122004

author: boful
author_rank: Contributor
timestamp: April 04, 2022, 05:01:06 am
content: Thanks !

author: MarkF
author_rank: Super Contributor
timestamp: April 04, 2022, 09:51:30 am
content: I haven't seen that circuit before.Somewhere I saw this suggested LM317 configuration to do the same thing regarding the pot wiper:It pulls the ADJ pin low if the wiper fails.I don't know how well it works.
New Tektronix 8 chanell oscilloscope AD :))))))))))))))))))))))))))))))))))))))) - Page 1
Forum section: electronics / testgear

author: MegaVolt
author_rank: Frequent Contributor
timestamp: April 04, 2022, 09:06:17 am
content: He is very handsomeIt's a pity that I missed their sale on April 1st)))))))))))))))))))))https://www.tek.com/en/adov8
Hantek DSO5102P issue - Page 1
Forum section: electronics / testgear

author: UnderTheRaid
author_rank: Newbie
timestamp: April 04, 2022, 12:06:07 am
content: Hi I have two 5102's and they both do the same thing. If I press measure the scope mean v is pretty close until I put it on 10v per division and go above 20v by the time I get the 24v dc the scope reads 2v lower at 22v mean. On 5v per division its much closer 23.6v. Am I being stupid and have something weird set or has anyone else noticed this? is there a fix for it I had a search but didn't see anything. Like I said both my 5102p's are the same.ThanksBrian

author: chinoy
author_rank: Regular Contributor
timestamp: April 06, 2022, 02:21:23 pm
content: Just got of the phone with a friend and we were discussing the poor accuracy for low voltage readings on this scope. My application needs 0-1 volt accuracy off .1 volt at least.BTW my unit landed up today. Unpacked it. Powered it on and it works. I got such a deal on it that I was afraid they would send me a dead unit.Anyway he gave me a tip he said make sure your not using the probe in 10x mode. Make sure its set to 1x.If that still does not work try with better quality probes.When I spoke to the local Hanteck dealer about poor accuracy on voltage he said well buy a Siglent then. lolI was going thru the user manual. Seems if there is a change in temp off 5c your calibration goes for a toss.So the user manual says let the scope run for 30 min for the temps to stabilize. Then do the calibration.Quoted from the user manual.The self calibration routine helps optimize the oscilloscope signal path for maximum measurementaccuracy. You can run the routine at any time but should always run it if the ambient temperaturechanges by 5℃ or more. For a more accurate calibration, please power on the oscilloscope andwait for 20 minutes until it has adequately warmed up.