hybridfree/eevblog-posts huggingface dataset:
MT8815A Radio Communications Analyzer TDCOM1 Error - Page 1
Forum section: electronics / testgear

author: johnrobjr
author_rank: Newbie
timestamp: July 21, 2020, 05:47:07 pm
content: Hi All:I've got a MT8815A that powers up; but, it gives a "TDMCOM1" error.Do you know (or does anyone know) what a TDMCOM1 is?... I am just guessing its a subsystem/board/module in the MT8815A frame? TDM and COM1 refer to time domain communications?There is a list of "items" the MT8815A frame checks/self-checks, upon powering it up... and TDMCOM1 is the last item. (All the others pass)there is an associated number, "6200352829"After quickly passing through the other item, during self checking, it pauses on TDMCOM1, for about 45 seconds, and then the following error message is displayed:"System abnormal completion. Please push any panel key."Ya. So when I push any key, the MT8815A powers down.I have the user manual, but no service manual (can't find the service manual on the Web, or on R&S Website)The user manual does not tell me what a TDMCOM1 is, or what the error message means.I have not opened the MT8815A up, or otherwise done anything. I'm thinking that it is better to find out what the error message means, before opening it up.Best regards.Johnrob

author: johnrobjr
author_rank: Newbie
timestamp: September 01, 2020, 02:06:02 pm
content: Hi: Can anyone give me a guest as to what TDCOM1 is. (I am guessing that it's a board in the mainframe, or a port, and is Timed Domain Communications port/board 1? Anyone know of a user group or support group for these?
SVA1015X Upgrade problem - Page 1
Forum section: electronics / testgear

author: PhilipPeake
author_rank: Regular Contributor
timestamp: August 30, 2020, 07:02:33 pm
content: Trying to load the latest firmware on my SVA1015X, and having problems.Downloaded V2.2.1.2.8.ADS onto a USB flash drive freshly formatted in FAT32.Current version is V2.2.1.5Press "System"Press "Firmware Update"Turn knob to select V2.2.1.2.8.ADS filePress "Open/Load"Pop-up menu warns about multiple reboots, and says Enter to updatePress "Enter"Screen shows a hour-glass and "Upgrading now, please wait...".Just sits there, with the hour glass spinning.Tried two different USB flash drives.Any ideas on how to proceed???

author: PhilipPeake
author_rank: Regular Contributor
timestamp: August 30, 2020, 07:19:22 pm
content: Don't know why it should make a difference, but grabbed the zip file from the EU site and tried with that - success.

author: tv84
author_rank: Super Contributor
timestamp: August 30, 2020, 08:29:42 pm
content: EU 1-0 US

author: PhilipPeake
author_rank: Regular Contributor
timestamp: August 31, 2020, 05:46:47 pm
content: If I were more enthusiastic, I suppose I should have done a binary compare between what I had on the USB flash and what I downloaded from the EU server. But even then, if there was a difference, and I think there must have been, I would have to chase down where the difference occurred.Maybe on the US server (I think this is unlikely).Unzipping ... maybe ...Copying onto the USB flash drive ... could be ...More likely, I haven't tossed any virgins into a volcano recently, so the gods decided to punish me.
Reading status from R&S NGE100 without enter "Remote" - Page 1
Forum section: electronics / testgear

author: pengi
author_rank: Newbie
timestamp: August 31, 2020, 04:53:10 pm
content: I got an Rohde&Schwarz NGE100 / NGE103B power supply, which I've connected to the network for monitoring.The background is that I want add the current status, like which channels are enabled and current draw as an overlay in OBS for live streaming. But I still want to use it through the front panel as a stand alone power supply.The problem is that in all methods I found puts the power supply in remote operation mode, which disables the front panel (unless holding "remote" button for a second), which doesn't work well with continous polling.Is there any way of properly reading the status over the network without entering remote mode?I would actually prefer remote desktop/vnc to actually get the screen as an overlay, I can't seem to find a VNC server as many other R&S equipment has.I've tried to emulate the web requests the web UI does (POST requuest to psu/index.php with arguments "webpage={8EA31E76-45A0-4250-BB1E-6E1C4A48A309}&mode=get&action=SampleOutput"), but that puts it in remote modeI've tried using telnet and use SCPI commands to read the values, which is the closest I've got, since there is a command for enabling local again, but since the interface is stateful (needs to select a channel, read value, change channel, read value) I'm not sure if that actually also affects the state of the scope.Any suggestions?
Zeroplus and Rigol 1054Z - Page 1
Forum section: electronics / testgear

author: IAmBack
author_rank: Regular Contributor
timestamp: August 05, 2018, 02:13:59 pm
content: Now Zeroplus software supports Rigol 1054Z officially.It means, that Zeroplus has to be synchronized with Rigol's scope, and software can grab scope's plot and display it on PC screen side-by-side with digital data.This option was so far available for higher-end Rigol scopes (and for some other scopes too), and worked with 1054Z but with errors. Now the 1054z is "official".I'm going to try that, but I'm not "in a mood" to play with my toys (Lap-c 16128 + 1054Z) at the moment. So maybe someone else…Anyway, FYI, if You didn't noticed that. It's nice to "upgrade" popular scope with "MSO" option.

author: Velund
author_rank: Regular Contributor
timestamp: August 31, 2020, 12:03:38 pm
content: Is there any chances that DS1052E/DS1102E will work with Zeroplus software?
uCurrent gold 0-100 uA - Page 1
Forum section: electronics / testgear

author: fgervais
author_rank: Newbie
timestamp: September 02, 2020, 09:49:59 pm
content: Hi,Would it be possible to change the uCurrent gold so it measures from 0 to 100 uA or even 0-50 uA instead of the 0-1000 uA?As it is, it's hard to get a precise reading because of the noise,The image shows the best I was able to do to measure the current in deep sleep of a esp32 board. Hard to tell precisely what the reading is.

author: fgervais
author_rank: Newbie
timestamp: September 02, 2020, 10:43:04 pm
content: Actually I got my things together and I think I got it. The schematic was messing with my headI think for a 0-50 uA I need to change the 10R resistor to a 204R072 or whatever close to that.Does it look about right?

author: EEVblog
author_rank: Unknown
timestamp: September 02, 2020, 11:47:29 pm
content: Let's say you wanted a 5mV drop maximum:5mV / 100uA = 50ohmsThat will give you 500mV output for 100uA input, or a scale factor of 5mV/uA.
ILX Lightwave LPA-9074B Manual and software request - Page 1
Forum section: electronics / testgear

author: nikodem
author_rank: Regular Contributor
timestamp: August 30, 2020, 03:22:50 pm
content: I have almost bought an LPA-9070 series laser diode parameter analyzer, but I cannot locate any kind of manual for this device. This is a bit problematic, as it is only controlled over GPIB and has no GUI on its own.Maybe someone has this manual and/or some software to control this piece?
Cosmetic defect Fluke 289? - Page 1
Forum section: electronics / testgear

author: elfsfed
author_rank: Newbie
timestamp: August 27, 2020, 06:53:35 pm
content: Hi everyone,It’s a while that I follow this forum and decided to register to ask this question.I recently bought a (new) Fluke 289 and I noticed that the “rubber” shell looks a bit rough. This is very difficult to explain so I will attach some pictures.Also your new 289 shows this? Am I complaining too much? (It is an expensive meter).https://imgur.com/a/UscANA7Thanks a lot!

author: Grandchuck
author_rank: Super Contributor
timestamp: August 27, 2020, 07:35:35 pm
content: Welcome! I would not worry about it (unless it looks worse than the photos show).

author: tom66
author_rank: Super Contributor
timestamp: August 27, 2020, 08:25:36 pm
content: Looks as if the mold used is wearing a bit, but purely cosmetic.

author: umbro
author_rank: Contributor
timestamp: August 27, 2020, 09:20:10 pm
content: One my Fluke 175 case looks same as your 289

author: Fungus
author_rank: Super Contributor
timestamp: August 28, 2020, 05:28:34 am
content: Is yours made in the USA or China?

author: coromonadalix
author_rank: Super Contributor
timestamp: August 28, 2020, 05:52:42 am
content: Never saw that on any used or new Fluke metersjust saw a 289 in a cal shop yesterday, clean and even surface all around the case body ??Is it only on the top/front case only or the bottom case too ?

author: elfsfed
author_rank: Newbie
timestamp: August 28, 2020, 06:52:42 am
content: It is mostly visible on the top half part of the casing. Will see if Amazon can replace it (it’s a week old). Probably there are more meters in the batch like this but we’ll see.

author: umbro
author_rank: Contributor
timestamp: August 28, 2020, 10:35:24 am
content: Quote from: Fungus on August 28, 2020, 05:28:34 amMine was made in USA. Only one side minor marks.

author: elfsfed
author_rank: Newbie
timestamp: August 28, 2020, 11:48:20 am
content: Quote from: Fungus on August 28, 2020, 05:28:34 amHow do I check? I only see a sticker on the box saying "Land of origin: United States".

author: Black Phoenix
author_rank: Super Contributor
timestamp: August 29, 2020, 12:41:48 am
content: From me it looks like the surface was clean with an abrasive/chemical solution and that is the reaction of it, but I may be wrong.But from the looks of it, don't bother is just cosmetic. It doesn't affect the performance or security in any form.

author: elfsfed
author_rank: Newbie
timestamp: August 29, 2020, 10:18:16 am
content: Thank you all for your replies. I decided to send a mail to Fluke and see if they would send a shell replacement, if not I will leave it as is.
Rohde & Schwarz CMU200  RXTX board - Page 1
Forum section: electronics / testgear

author: szszjdb
author_rank: Regular Contributor
timestamp: August 27, 2020, 03:23:21 am
content: Hi Sir,I am repairing my CMU200 which have not output on TX side. The issue is located on the RXTX board. There have a yellow part with 4 signal port and 4 GND port confuse me.Please refer to the atttached picture. The part is on the output signal path for band switching.Does anyone recognize the part or its function?Best Regards,

author: szszjdb
author_rank: Regular Contributor
timestamp: August 28, 2020, 01:32:05 pm
content: Hi Sir,Is there anyone view the topic?From the layout, it seems 2 port pass the 10Mhz-1.2G signal and the other 2 pass the 1.2-2.2g signal. It is interesting to learn about the function of it.What kinds of filter?Any comment would be appreciated!Best Regards,

author: DigitalDeath
author_rank: Regular Contributor
timestamp: August 28, 2020, 03:31:08 pm
content: That looks like a components from the Xinger components line from Anaren. There are other brands, this is just one example.In this case it looks more like a RC bridge to cross RF lines without doing multi-layer PCBs.https://www.anaren.com/catalog#xinger

author: szszjdb
author_rank: Regular Contributor
timestamp: August 28, 2020, 06:00:17 pm
content: Hi DigitalDeath,Many thanks!You mean it is just a RF jumper? But the main PCB is already the multi-layer type.I am sorry that I can not open the component website due to my network issue. Could you help to attach an example PDF here?Best Regards,

author: szszjdb
author_rank: Regular Contributor
timestamp: August 29, 2020, 03:30:19 am
content: Hi DigitalDeath,Many thanks again!It is a jumper indeed! Attached the PDF ,if someone else need it.Best Regards,
IFR 2399 - Page 1
Forum section: electronics / testgear

author: tiredtech
author_rank: Newbie
timestamp: August 26, 2020, 04:23:31 am
content: I am looking for a MAINTENANCE manual and/or schematics for the IFR 2399 Spectrum Analyzer. I have the Operations and Programming manuals. I would prefer a PDF. I am tracing down a fault in either the Tracking Generator module (most likely), or possibly a failure in the YIG signal from the RF module feeding the TG. I do not have access to another spec analyzer at this time, especially not above the 3Ghz range. Any help/advice/half-hidden pointing fingers would be appreciated. - tiredtechUPDATE: I understand that this unit originated from LG in Korea and was rebranded by IFR. Can anyone give me any more information? A basic scouring of the internet hasn't turned up anything about LG's test equipment or any documentations. The IFR also closely resembles the LIG NEX1 NS-30, but a search for info about LIG and it's test equipments also turned up little (except for sales pitches for new equipment) Again, any help is appreciated. - tiredtech

author: BravoV
author_rank: Super Contributor
timestamp: August 26, 2020, 05:19:35 pm
content: Owner of LIG NEX1 NS-30, don't think my post will help you much, as I've seen searching for years as well, no luck.The only service maintenance manual I spotted is quite similar is model IFR-2398, just google for it.Also there is a good resources in this thread below regarding Aeroflex 239x series , and including maintenance password too.->https://www.eevblog.com/forum/repair/aeroflex-ifr-2398-calibration-repair-help/Hope this helps.

author: tiredtech
author_rank: Newbie
timestamp: August 26, 2020, 06:24:39 pm
content: Thanks for your replay. I have seen the IFR 2398 thread also and you are right, there is a lot of insight there.I have removed the TG-7270 module and started looking for "smoke leaks", but so far nothing obvious. Too bad detailed info is so hard to find on these SA's. They were apparently marketed under several labels. Mine was working fine and then one day the TG just stopped working. The rest of my analyzer still works fine.I am still hopeful that someone, somewhere will have the maintenance/service info or schematics for the TG.Thanks again and good luck to you. - tiredtech

author: George Edmonds
author_rank: Frequent Contributor
timestamp: August 29, 2020, 02:06:27 am
content: HiThis tread is now duplicated between Repair and Teastgear, so I am double posting my reply.Attached is a scan of all that the 2399 maintenance manual says about the TGGeorge G6HIG Dover UK
Oscilloscope MSO2024 will not start - Page 1
Forum section: electronics / testgear

author: hsoli
author_rank: Newbie
timestamp: February 09, 2015, 11:25:59 pm
content: Oscilloscope MSO2024 will not start .i got new Oscilliscope was stored in the original box for long time, tried to power it up.I got white screen without no actions or even the splash menue.it seems that the Oscilloscope has nothing to load.How can i reset the firmware or debug this oscilliscope?

author: tautech
author_rank: Super Contributor
timestamp: February 09, 2015, 11:35:53 pm
content: Quote from: hsoli on February 09, 2015, 11:25:59 pmWelcome to the forum.Check the PSU is to spec.Check all interconnect cables.(re-seat)

author: Hydrawerk
author_rank: Super Contributor
timestamp: February 09, 2015, 11:39:10 pm
content: Do you mean a Tektronix scope?http://www.tek.com/oscilloscope/mso2000-dpo2000

author: hsoli
author_rank: Newbie
timestamp: February 10, 2015, 08:10:41 pm
content: Hello EveryoneThanks for your quick response.Yes The link is correct, It is the correct mode.PSU looks running , i can see the Fans running. I did not try to open it.It is new device never powered before.I tried to get the Firmware update on USB flash but it seems did not finish the full power cycle.My questions:What could impact the power cycle for new equipment?How can identify it is hardware issue not firmware?ThanksHany

author: hsoli
author_rank: Newbie
timestamp: February 11, 2015, 08:25:10 pm
content: it was PSU.Can i get the PSU from other vendors?i searched online but no luck

author: tautech
author_rank: Super Contributor
timestamp: February 11, 2015, 10:12:28 pm
content: Quote from: hsoli on February 11, 2015, 08:25:10 pmSo it was not to spec, right?Which rail was out of spec or was it too much ripple?How long had ithe scope been sitting unused?

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 12, 2015, 03:29:49 am
content: Can you post a photo of the PSU? I am sure it can be repaired.

author: Hydrawerk
author_rank: Super Contributor
timestamp: February 12, 2015, 07:58:42 pm
content: The PSU might look like this.https://plus.google.com/photos/106264218831814439783/albums/5877858521093564545

author: hsoli
author_rank: Newbie
timestamp: August 28, 2020, 09:19:26 pm
content: I was wrong it is not PSU, I replaced PSU by a new one from tektronix and i replaced display module by a new one.Now i am doubting it is main board or some in firm ware presenting the system from booting, any ideas. I exhausted all my ideas.I appreciate your ideas.
Calibration Black Star 1325 - Page 1
Forum section: electronics / testgear

author: Curtis Swan
author_rank: Newbie
timestamp: August 28, 2020, 01:44:51 pm
content: HiLooking for calibration information on my Black Star 1325 1300MHz frequency counter. Any help appreciated. Cannot find a service manual anywhere. No circuit diagram in the user manual either.Many Thanks in anticipation!!

author: AVGresponding
author_rank: Super Contributor
timestamp: August 28, 2020, 01:51:20 pm
content: Always worth trying an email to TTi tech support for old Black Star, Thandar, Thurlby stuff.Got my 4503 service manual that way.

author: tggzzz
author_rank: Super Contributor
timestamp: August 28, 2020, 02:09:55 pm
content: Quote from: Curtis Swan on August 28, 2020, 01:44:51 pm"any calibration information on my" is ambiguous.I guess you mean "how can I adjust it", but it might mean "how can I calibrate it" or "what ismyinstrument's calibration" or conceivably "what's the specification".Given that there isn't much you can tweak on a frequency meter, I'dmake sure the power supplies are correct and don't have a lot of ripplelocate the crystal and the trimcap next to itfiddle with the trimcap until the display shows the result you wantWhat's your reference frequency source?

author: Curtis Swan
author_rank: Newbie
timestamp: August 28, 2020, 02:23:39 pm
content: Reference is a GPS DO.I am looking to fit an OCXO and external input for an 10MHz frequency standard so I have a counter I can see and even better rely on.I have the user manual and am looking for the accompanying service / calibration manual. Cant find one from the usual resellers or online.Thanks.

author: tggzzz
author_rank: Super Contributor
timestamp: August 28, 2020, 04:11:24 pm
content: And that's a good example of why this is useful:"Tell us your problem/goal, as well your solution. In most walks of life, technical or non-technical, if we know the reason for the question you will probably get a better answer. Either the answer will be more pertinent to your needs, or perhaps it can suggest a better alternative that you haven’t even considered. Don’t ask “Can you give me a lift into town?” Do ask “Can you give me a lift into town, so I can replace my broken frobnitz?”. The answer might be “There’s a spare frobnitz in the attic”, thus saving time, money, the environment – as well as making some space in the attic."Otherhints availableApart from that, is it worth the effort? Doing what you are suggesting is perfectly fine entertainment, but there are many good counters on fleabay or at other auctions such ashttps://www.bidspotter.co.uk/en-gb/auction-catalogues/timed/ramco/catalogue-id-ramco-10236?searchTerm=frequency&whereToSearch=%2Fen-gb%2Fauction-catalogues%2Ftimed%2Framco%2Fcatalogue-id-ramco-10236There are no guarantees with the latter, of course, but they ship for £18.Personally I'd be looking at a reciprocal counter for most purposes.
RTB2004-COM4 RTB-B6 Pattern Generator Trouble on SAVE/LOAD - Page 1
Forum section: electronics / testgear

author: Antonino
author_rank: Newbie
timestamp: August 26, 2020, 04:39:50 pm
content: Hi,i'm Antonino from Rome.I want to apologize immediately for my poor English.My problem arises when I intend to load a previously saved arbitrary pattern.No problem if I try to load the ARB.SCP file already contained in the internal memory. (/INT/SETTINGS/ARB.SCP)The problem only occurs when I try to load a file saved by me.The oscilloscope freezes.I found that the files I saved have more or less this formatting (MyFile.SCP)::PGEN:FUNC ARB:PGEN:PATT:ARB:DATA 1,2,4,8,0:PGEN:PATT:ARB:DATA:LENGTH 5.000000e+00:PGEN:PATT:BURS:STAT 1.000000e+00:PGEN:PATT:ITIM 4.000000e-02:PGEN:PATT:BURS:NCYC 5.000000e+00:PGEN:PATT:STIM 1.000000e-04:PGEN:PATT:STAT 1.000000e+00Instead, the ARB.SCP file already in memory starts with:*RST;*CLSCHAN1:STAT 1CHAN1:POS -2.5PROB1:SET:ATT:MAN 10.0CHAN1:SCAL 0.5PGEN:PATT:STAT 1PGEN:FUNC ARBPGEN:PATT:ARB:DATA 0,1,2,4,8,0TRIG:A:TYPE EDGETRIG:A:SOUR CH1TRIG:A:EDGE:COUP DCTRIG:A:EDGE:SLOP POSTRIG:A:LEV1 1.5TIM:SCAL 5e-6If I manually add (through RSCommander on the pc) the line* RST; * CLSto MyFile.SCP then the oscilloscope loads correctly.*RST;*CLS:PGEN:FUNC ARB:PGEN:PATT:ARB:DATA 1,2,4,8,0:PGEN:PATT:ARB:DATA:LENGTH 5.000000e+00:PGEN:PATT:BURS:STAT 1.000000e+00:PGEN:PATT:ITIM 4.000000e-02:PGEN:PATT:BURS:NCYC 5.000000e+00:PGEN:PATT:STIM 1.000000e-04:PGEN:PATT:STAT 1.000000e+00Any suggestions?Best regards and many thanks.AntoninoP.S.Device Firmware version 02.202

author: Antonino
author_rank: Newbie
timestamp: August 26, 2020, 06:05:36 pm
content: Hellothank you very much.Also, each line of the file begins with ":".Strange behavior...Antonino

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: August 26, 2020, 06:33:55 pm
content: Let me run this by the development team.Thanks,Rich

author: Antonino
author_rank: Newbie
timestamp: August 26, 2020, 07:09:16 pm
content: @PeDreOk, but keep in mind the ARB.SCP prebuilt in internal storage(R&S) Is written whitout ":".Thanks a lotAntonino

author: Antonino
author_rank: Newbie
timestamp: August 26, 2020, 07:12:12 pm
content: Quote from: Rich@RohdeScopesUSA on August 26, 2020, 06:33:55 pmThanks to you!Antonino

author: Antonino
author_rank: Newbie
timestamp: August 26, 2020, 07:17:43 pm
content: Quote from: PeDre on August 26, 2020, 05:53:24 pmThis Is true also for int storage.No differnces.Thanks,Antonino

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: August 27, 2020, 01:53:59 pm
content: Heard back from the team - this is apparently a known issue and a fix is planned for the next release. The next release is currently planned for October.-Rich
Datron Wavetek 1271 (maybe 1281?) service note..... - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: July 08, 2020, 03:52:20 pm
content: This is sort of a service note, I don't know if it applies to the 1271 and 1281 or whether it is just a certain serial number range on the 1271.I had uploaded the wrong file, I have modified the message and attached the correct file. My apologies!!

author: picburner
author_rank: Frequent Contributor
timestamp: August 30, 2020, 12:53:38 pm
content: There is something wrong with this document (or something happened after publication), it is not a pdf file but a pic:

author: Mickle T.
author_rank: Frequent Contributor
timestamp: August 30, 2020, 05:28:57 pm
content: volvo_nut_v70, can you re-upload the file? Ple-e-e-a-se
HP 8722D - Page 1
Forum section: electronics / testgear

author: bdunham7
author_rank: Super Contributor
timestamp: August 26, 2020, 04:45:43 pm
content: A local surplus place I sometimes buy from has this for sale (ending soon!) and I'm a bit surprised at the bids. Other than a deep-pockets company or government lab that would just buy new anyway, who would be in the market for this monster and what would they do with it?https://www.ebay.com/itm/HP-8722D-Microwave-Network-Analyzer-50mhz-40ghz-Options-000-010-1D5-040-085/274464859134?epid=10002488858&hash=item3fe76163fe:g:68QAAOSwK2ZfPW-H

author: MadTux
author_rank: Frequent Contributor
timestamp: August 26, 2020, 08:40:42 pm
content: Look at the prices of new VNAs with similar specs, then the $14k is kinda cheap, if you really need a VNA.What to do with it? Measure S-parameters of the components you're interested in, between 50MHz-40GHz.40GHz is a bit much for my hobby stuff, but a VNA from like 0-3GHz to measure things like amplifier gain/phase is a nice toy to have, much more accurate/easy to use than with oscilloscope, so I kinda understand why people pay that much, especially if it goes up to 40GHz.
Tek CSA803A Fan power source question. - Page 1
Forum section: electronics / testgear

author: JimS
author_rank: Contributor
timestamp: August 26, 2020, 11:54:33 am
content: I'll start with the background to what is going on.I decided to resurrect my CSA803A after being on a shelf for just over 10 years.At first it had 4 timing errors on power up test.Removed the sampling head's I put in, removed the covers & looked around.Power it up again, with out the heads and regular and extended diag's passed.I noticed (how could I not) the not exactly quiet Pabst fan in it.So I decided a good project would be to find a replacement fan with the same CFM.The original Pabst, from what I could find, is 6300RPM and around 105CFM & a quite high dba.I settled on a 140mm Noctua industrial fan, 2000 RPM and 105CFM and 20+ dbm quieter.So with the fan a grill and a 120/140 adapter away I went.(The fan exhausts the air from the rear of the scope)The retrofit went well and I decided to check the voltage at the fan.What I discovered is why I'm making this post.First test I saw the voltage jumping all around on my Fluke DMM.Removed the power supply & the regulator PCB and looked it over.The power source to the fan comes from the regulator PCB.From a +5V regulator transistor's input, to the power supply.There is a small ceramic bypass cap, then through a fuse and to the fans plus input.So far so good, but on the fan's minus side things get interesting.It goes though a diode to a 10 ohm resistor and from there I lost the trace.I did not want to dissemble the power supply so I took the following scope measurements.This is the first time I have run into this type of signal on a DC fans power lead, no less than the negative lead.I would think that if you wanted to control the fans speed you just vary the DC voltage, not do what I saw.Thoughts, Ideas??
TEK2440 set probe attenuation - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: August 25, 2020, 07:41:18 pm
content: Hello mates,i'm kind of ashamed to ask this but, where on earth should I change my probe to X10 on a tek 2440?The only thing the user guide metion is it automatically adjusted when used tek coded probes, but I'm using just a regular probe.file:///D:/Downloads/2440.pdf

author: LazyJack
author_rank: Frequent Contributor
timestamp: August 25, 2020, 09:06:18 pm
content: You can't. It is automatic only, there is no way to manually override.

author: rvalente
author_rank: Frequent Contributor
timestamp: August 25, 2020, 09:44:29 pm
content: What were tek engineer thinking?Does anyone knows the resistor values for setting at x1, x10, x100 and x1000?

author: tautech
author_rank: Super Contributor
timestamp: August 25, 2020, 09:53:36 pm
content: Quote from: rvalente on August 25, 2020, 09:44:29 pmThey wanted you to usetheirprobes.QuoteOpen, 10K, 20K I think and not sure.A dig around the internet should find the values.Sensing probes aren't that expensive, you should get some.

author: rvalente
author_rank: Frequent Contributor
timestamp: August 25, 2020, 10:14:35 pm
content: Had a little fun now..X1 - 15 to openX10 - 10k, 12KX100 - 7KX1000 < 3K to shortQuote from: tautech on August 25, 2020, 09:53:36 pmI agree, but just a few of my probes are from tek, sometimes a no brand chinese to mearure 100Khz is just fine heheheheheAnyway, I like the self detection probe, very useful, but come'on tek, what were you thinking for not leaving a damn menu to choose...Lets say I have a weird 250:1 probe, can't u left some custom value to fill, just like you do in the newer scopes?

author: MarkL
author_rank: Unknown
timestamp: August 25, 2020, 10:39:27 pm
content: Here's some tables for probe readout pins:https://www.electronics-related.com/showthread/sci.electronics.design/116046-1.phpThere's not consistency between manufacturers, or even between models from the same manufacturer.
For you, what functions do you want MPPT to have - Page 1
Forum section: electronics / testgear

author: Kang le
author_rank: Newbie
timestamp: September 01, 2020, 01:35:03 am
content: For you who need MPPT solar controller, what functions do you want MPPT to have?

author: tautech
author_rank: Super Contributor
timestamp: September 01, 2020, 03:18:24 am
content: LAN connection for remote monitoring and daily charge history.A range of battery chemistrys supported with the ability to fine tune charge voltage limits.A live status window.Battery temp.Some examples attached.

author: BravoV
author_rank: Super Contributor
timestamp: September 01, 2020, 07:09:45 am
content: Cloud thingy if exist, can be turned off.

author: tautech
author_rank: Super Contributor
timestamp: September 02, 2020, 12:51:46 am
content: The ability to gang several controllers together that all control the charge into one battery bank and control the charge inputs from split solar arrays and wind generation. Say a max of 4 controllers and each with their own configurable identity.More points if they can all be data linked together for remote monitoring from a single access address.

author: wizard69
author_rank: Super Contributor
timestamp: September 02, 2020, 12:55:30 pm
content: My desires are a bit different:Portability, the design needs to be rugged to withstand constant handling and transportation, including backpacking or a rough ride on a boat.Light weightLithium Polymer and Lithium Iron Phosphate support. with built in load balancing.A power dump port for when the battery is charged up. That port should be 12VDC or another common voltage and should be voltage regulated not MPPT. if the port can't handle the load an alarm should be generated.complete service information Including software and hardware manuals, schematics and parts list.A documented RS232 port! Yeah I know ancient technology but also extremely easy to work with on any platform.Open source Linux app to communicate with the controller. I don't see a huge value in an open sourced firmware but on a PC app the platform can really benefit from an open software control platform. However the interface protocol needs to be well developed so that DIY software is possible.Because of the interest in portability a range of devices may be in order, the low end being ultra compact, Someplace in the lineup a built in battery for a completely self contained power supply.Which brings up my final suggestion. The MPPT should be able to handle a secondary non photocell input. Neither input should hard the other.Quote from: Kang le on September 01, 2020, 01:35:03 am
Buying used Fluke 123B  - Page 1
Forum section: electronics / testgear

author: tubos
author_rank: Contributor
timestamp: August 23, 2020, 11:12:17 am
content: I'm interested in buying a used Fluke 123B scopemeter for hobby as a portable scope but I have some questions:It has not been calibrated since it was first purchased (2017) , should that be a problem?Is there an diagnostic inside that will show an error message when calibration is way off?Anyone else like to share experiences with this scope for hobby use?

author: tubos
author_rank: Contributor
timestamp: August 25, 2020, 03:19:54 pm
content: No hobbyists with fluke 120B series experience?

author: tszaboo
author_rank: Super Contributor
timestamp: August 25, 2020, 03:57:43 pm
content: Answers:- Probably not, depends what they were doing with it. if it was on the shelves somewhere, or they were regularly dropping it from the top of a cell tower.- No, thats not how calibration works- This is a very expensive specialized equipment for field use, hobbyists usually dot do that, or they buy something that is better value for the money. Consider if you really need an isolated battery powered oscilloscope with some lacking features.

author: tubos
author_rank: Contributor
timestamp: August 25, 2020, 06:04:33 pm
content: Quote from: NANDBlog on August 25, 2020, 03:57:43 pmNo I don't , but I can get it at a good price used , so I might go for it. I have no special requirements. But i do appreciate the portable function.Microcontroller stuff , audio and general troubleshooting < 20Mhz & Occasional car Electrics checking.

author: rvalente
author_rank: Frequent Contributor
timestamp: August 25, 2020, 08:02:53 pm
content: I've use some older fluke scopemeters while troubleshooting machines in steel factories in the past, not so new as 123B.I would buy them? Well, if you work with high energy environment and need something that is dumb proof and do not need much resources then flukes scopemeters is for you.If you value you money and want to have a fast and resourceful which does not cost a arm and leg then, don't get a Fluke Scopemeter.Do you need isolated channels? Check the siglent portable, wanna go cheaper? Go for a used Agilent U1604B.Don't need isolated channels? Micsig STOxxxxI own a THS720, slow, old, no memory at all, but a work horse for field use. Looking to sell it soon
Unusual vintage dual CRT scope. (And it's free for pickup in MA USA!) - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: August 25, 2020, 08:07:04 am
content: https://boston.craigslist.org/gbs/zip/d/boston-antique-oscilloscope/7183789021.html

author: Grandchuck
author_rank: Super Contributor
timestamp: August 25, 2020, 11:48:08 am
content: Those were used in educational settings. We had one in our lab in the 1960's. Worked well for demonstrating.
Advantest R3265A - Page 1
Forum section: electronics / testgear

author: JohnK625
author_rank: Newbie
timestamp: August 23, 2020, 10:34:45 pm
content: I have an Advantest R3265A Spec-an that needs some power supply attention.But, for the life of me I can't see any way to get to the power supply without completely dis-assembling the thing - I mean everything!Am I missing something? The service manual is of no help at all.Can anyone tell me how to get to the power supply?

author: mgladu
author_rank: Newbie
timestamp: August 24, 2020, 09:01:07 pm
content: Hi JohnK625:I have an Advantest R3265A on the bench that I am trying to figure out how to extract the power supply from to replace the capacitors.See attached photo for my progress so far.This link might be of interest too, in case you have not found it yet.http://alain.mionnet.pagesperso-orange.fr/enR3265_3271.htm73 de N1FBZ
Rigol DG1022Z harmonic setting bug? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: August 10, 2020, 02:13:16 am
content: I generate a 400Hz sinewave on channel 2 at 2mV p/p. The minimum. Then I turn on the 4th harmonic and H4 goes to 1.2v p/p and you can’t change the amplitude. In fact, sitting at the fundamental, if you go to any harmonic of 4 or greater the 4th harmonic comes on like this and the higher harmonic stays at zero V and can’t be adjusted. The only way you can turn of H4 is to go to H3 or lower. Firmware is 03.01.12 (latest available version)

author: Circlotron
author_rank: Super Contributor
timestamp: August 24, 2020, 06:42:23 am
content: Bump for a new set of eyes.
Old Hioki Analog Meter and Questions - Page 1
Forum section: electronics / testgear

author: bnordlund
author_rank: Newbie
timestamp: August 21, 2020, 05:51:45 am
content: I have a lovely Hioki analog multimeter, model SE-37B. I found it while cleaning out an elderly relative's house. He had a decades-long electronics career, and was a respectable test equipment hoarder. After a bit of cleanup and resoldering of a couple of joints, it is working great.In addition to the normal V, I and Ohms scales, it also has scales for inductance and capacitance. The meter face says to use the 10V AC for the inductance scale and 50V AC for the capacitance scale. Since there are no active components inside this meter, I am guessing that an external signal source might be required.Is anyone familiar with how these measurements would be made? I have a somewhat dangerous theory where line voltage is applied across the meter in series with the component under test, but it might be more healthy to avoid that experiment! I have not found any manuals on line either for the SE-37B, or for the SE-37A, which was a similar model.Does anyone remember how this would have been used, or maybe even have a manual? Lacking that, maybe someone has a theory to throw out for discussion.I'll includes a couple photos in case there are others who enjoy this old gear like I do..BrianBeaverton, OR

author: mqsaharan
author_rank: Regular Contributor
timestamp: August 22, 2020, 01:41:44 am
content: Quote from: bnordlund on August 21, 2020, 05:51:45 amYou already know it.I have a Sanwa U-50D. It also has scales for capacitance as well as high resistance functions. I have never tried to use these functions. I am including its manual. Please take a look at pages 28-30. It confirms what you already know.

author: bnordlund
author_rank: Newbie
timestamp: August 22, 2020, 06:42:46 pm
content: Aha! Thank you very much! Not only are these meters from a time when the design and assembly reflected great pride, I always enjoy reading documentation that is so well done.I do have another mystery, relating to this meter. In the carry case, there was a 70 ohm power resistor with a clip on one end and a push on terminal on the other end. My relative was an appliance repairman, so that is the main clue. Whatever the task was, it must have been common enough to justify making this item. 70 ohms is a little high to be a current shunt, but maybe something to detect small leakage currents to ground?Thanks again,Brian.

author: mqsaharan
author_rank: Regular Contributor
timestamp: August 23, 2020, 10:24:06 am
content: Quote from: bnordlund on August 22, 2020, 06:42:46 pmYou are welcome.I guess you are right. It does seem OK and in some cases a good idea to use it for measuring small leakage currents to ground as the chassis used to be metal frames back then. Otherwise, I have no clue where or for what purpose he could be using that 70 ohm resistor.But there are many seasoned repair personnel on this forum. Maybe somebody could shed some light on its (regular) use in the repair work.
Tektronix TLA704 running WIN2000 cannot shut down - Page 1
Forum section: electronics / testgear

author: DarrySong
author_rank: Newbie
timestamp: August 22, 2020, 06:19:05 am
content: HelloI have a TLA704. Yesterday, I installed a new version of BIOS, upgraded 64MB of memory, installed the windows 2000 operating system and tla5.1 software. Everything seemed to be very good. But when I wanted to shut down, I found that Windows 2000 could not be shut down. After pressing the power button, there was a blue screen error. Can anyone help me solve this problem? Thank you.Darry

author: DarrySong
author_rank: Newbie
timestamp: August 22, 2020, 07:46:24 am
content: I'm not sure if it's ACPI BIOS or not, but APM is enabled, both in BIOS and in WIN2000.Darry

author: DarrySong
author_rank: Newbie
timestamp: August 22, 2020, 11:09:21 pm
content: Yesterday, I found a BIOS file in the search function of the forum. In the readme file, it can only be applied to the LCD screen with 800x600 replaced. My tla704 screen is still 640x480. After I install the BIOS, the display is no longer normal, but Windows 2000 can be shut down. I want to find a good solution, which can be shut down and normal on my 640x480 screen , thank you.
Rigol DS4000 / MSO4024 Cant get option and bandwidth hack work on this scope...? - Page 1
Forum section: electronics / testgear

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: August 22, 2020, 05:54:08 pm
content: Hi,after hours reading about hacks, i dont get any further..Got a MSO4024 , with all options pre instaled. Software version 00.02.03.SP2 HW version 1.3Tried to uppgrade to 500MHz, with no luck. Need that resolution badly.Use :http://gotroot.ca/rigol/riglol-archives/riglol-1.1.2/Cant find the the RIGLOL 1.03d site is:http://www.gotroot.ca/rigol/riglol-103d/Serial DS4CxxxxxxxxxxxGet :FAB9 - RFJ9JBB-N3AWWUS-TKGB5E2-R5VA9USRS39 - RRJ9JBB-N3SWWUS-HAX3QV2-YU9E9UARBT9 - RRJ9JBB-N3BWWUS-UKVTUXA-ZT349TAAll codes go in and say options instaled. System Information still say MSO4024..Anybody got a clue what i do wrong?Erik..

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: August 22, 2020, 06:49:23 pm
content: Thanks!Missed that point! I was checking the model nr and it was not changing! But when i checked the options menu it was ok!Then it's just to add the new sticker on the front !Rigol did send stickers for all resolutions with the scope.
Sensor array identification - photos - Page 1
Forum section: electronics / testgear

author: mustafakerb
author_rank: Contributor
timestamp: August 22, 2020, 10:40:53 pm
content: I have a mysterious sensor from medical surplus and try to identify its type. There are no markings on IC package, but I made macro shots and there are some on sensor die. So far I'm pretty sure it's Hamamatsu Phonics part based on "HPK" abbreviation. It looks like some sort of 6x6 (photodiode?) array wire bonded to integrated amplifier? Google fu does not render any results of datasheet.Markings on die are:HPK FS-81945P NEW5 PAMP_38Any clue how to read it? Based on IDC trace routing, it can be very sensitive so I thought to ask first, before measure anything.

author: mustafakerb
author_rank: Contributor
timestamp: August 22, 2020, 10:43:08 pm
content: 2

author: mustafakerb
author_rank: Contributor
timestamp: August 22, 2020, 10:44:29 pm
content: 3

author: mustafakerb
author_rank: Contributor
timestamp: August 22, 2020, 10:45:26 pm
content: 4

author: mustafakerb
author_rank: Contributor
timestamp: August 22, 2020, 10:49:10 pm
content: 5
Need manuals for Tenma 72-895 & 72-900 - Page 1
Forum section: electronics / testgear

author: Bargainhunter
author_rank: Regular Contributor
timestamp: August 20, 2020, 07:32:59 pm
content: I cannot find any manuals on the Tenma 72-895 & 72-900. They are the Wow & Flutter meter and the Distortion analyzer. I called MCM/Newark who are the U.S. distributor for this brand and they don't have any. The rep said he would contact the manufacturer to see if he could get the manuals for me but I have not heard back.Does anyone have a manual for each that they could copy?Thank you very much,Chuck
HP 8644A complete manual. - Page 1
Forum section: electronics / testgear

author: bdunham7
author_rank: Super Contributor
timestamp: August 20, 2020, 03:25:06 am
content: Does anyone have the entire users manual "Operation and Calibration" for the 8644A? Mine and every version I can find, including from Keysight, is truncated and doesn't have most of Chapter 4 (programming), the appendixes or option operation parts. They all seem to be 424 pages with 2 blank at the end.If you have a non-bound hardcopy, I would be willing to pay postage two ways in order to scan it.
Python with bash shell - Page 1
Forum section: electronics / testgear

author: elenaflorence
author_rank: Newbie
timestamp: August 20, 2020, 07:07:02 am
content: Hello Guys following Question,i have a Programm that sends me every second in the Terminal(its aPythonprint function) a refresh about some data. I would like to know if its possible to write a bash shell with python that only refreshes the stats of an shown value in an a bash shell.Thanks for your help in advance.

author: greenpossum
author_rank: Frequent Contributor
timestamp: August 20, 2020, 07:13:56 am
content: Perhaps running the Python script under the "watch" program in a separate terminal window can meet your needs? This only works if the program is run afresh each time.If it runs continuously you could send the clear screen sequence so that the new output overlays the previous output.

author: Zucca
author_rank: Unknown
timestamp: August 20, 2020, 07:15:16 am
content: Spam?
GPP-4323 Ripple - Page 1
Forum section: electronics / testgear

author: drwho9437
author_rank: Regular Contributor
timestamp: August 20, 2020, 01:26:27 am
content: Looks like the Ripple on the GPP-4323 is only to 1 MHz instead of the standard 20 MHz. Can anyone report what the ripple is over the full 20 MHz? vs limiting it with post processing to 1 MHz? (FIR or other method of samples).I didn't know about the GPP-4323 until the other day but given the cost it might be the best deal though I'd be hard put to give up the noise performance over Rigol and Keysight offerings.
Current voltage adapter for AC measurements - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: August 19, 2020, 08:49:46 pm
content: Hello Mates,I own a 87V and want to make a adapter gadget to plug-in, to measure line voltage and current drawn by an appliance.Any danger wiring this way?The DPDT switchs between voltage and current modes, as the SPDT between 10A and mA ranges.
Noise source calibration - Page 1
Forum section: electronics / testgear

author: srce
author_rank: Regular Contributor
timestamp: August 19, 2020, 10:24:50 am
content: I have a NoiseCom NC346B noise source I would like calibrated (as some Y-factor NF measurements I'm making of some LNAs are 0.8dB higher than expected). Can anyone recommend somewhere that can do this (preferably in the UK)? Thanks.
HP/Agilent E4200A Broadband Series Test System (BSTS) - any in Aussie? - Page 1
Forum section: electronics / testgear

author: Drewbie
author_rank: Contributor
timestamp: August 19, 2020, 09:50:51 am
content: Anyone seen any HP/Agilent E4200A Broadband Series Test Systems (BSTS) in the wild in Aussie or NZ?I think they may have built them in HP's Melbourne factory?
Miniware MDP-P905 Firmware Upgrade Cable - Page 1
Forum section: electronics / testgear

author: GingGangGooly
author_rank: Contributor
timestamp: August 18, 2020, 11:07:11 pm
content: Hi allWell I have managed to lose my firmware upgrade cable for the Miniware MDP-P905 PSU.I can't find a replacement cable or pinout online.Does anyone have the pinout, or would be willing to check their cable and post the pinout details?I believe (from memory) the programming port needs a 3.5mm stereo male plug (please correct if I have this wrong).Thanks in advance for any help you can provide.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 19, 2020, 12:20:11 am
content: A thread here, but i think it can be connected thru usb plug ??https://www.eevblog.com/forum/testgear/miniware-mdp-xp-digital-power-supply-set/the website iswww.miniware.com.cntry to contact them ?and a forumhttp://www.minidso.com/forum.php?mod=forumdisplay&fid=90
AOIP PN 5207 and GPIB - Page 1
Forum section: electronics / testgear

author: Electrole
author_rank: Contributor
timestamp: August 15, 2020, 08:23:20 pm
content: I have an AOIP PN 5207 thermometer with GPIB, but no manual, so I'm not having much success with the communication. Until now, I have had to use a multimeter and measure the thermometer's DC output in order to monitor temperature with the PN 5207Does anyone of you have a manual with programming details, or perhaps you have experience with communicating with the PN 5207?

author: shakalnokturn
author_rank: Super Contributor
timestamp: August 15, 2020, 10:02:17 pm
content: No straightforward answer, the information on AOIP equipment is scarce.However, if you spend some time reading you may find help in the following links:https://www.eevblog.com/forum/testgear/obscure-french-aoip-mn5127-bench-dmm-teardown/I believe it will have very similar hardware to your thermometer, the manual lists the same GPIB supported functions as noted near the GPIB connector on the PN5207.http://eninz.free.fr/AOIP_MN5127/User_Cal_Schematic_AOIP_MN5127.pdfA little programming for similar vintage AOIP DMM's whatever the language is...http://materiel-physique.ens-lyon.fr/Logiciels/CD N° 3 BUP DOC V 4.0/Disk 1/TEXTES/1992/07420435.PDFGood luck...Edits:Last link

author: Electrole
author_rank: Contributor
timestamp: August 18, 2020, 08:17:02 pm
content: Great input! I will try to see if there's any similarity the next time it's not in use.Thanks to your documentation I can see that there are at least the same ICs in the GPIB section of the MN5127 and the PN5207: TM9914ANL, SN75161AN and SN75160AN.