hybridfree/eevblog-posts huggingface dataset:
Strong internal pulses showing up at the Keithley digital voltmeter input  - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: September 19, 2024, 01:52:52 pm
content: Unlike analog voltmeters (multimeters), digital ones have internal pulses.It is natural to expect that to some degree these pulses will leak to the input of a digital voltmeter.I connected input of Keithley 199 multimeter/scanner by 50 ohm terminated BNC cable tothe Channel 2 input of a Keysight scope. The Keysight channel 1 input was connected to the Keithley "Meter complete" output.The Keithley was set to measure DC volts at the 30 volt range.I set the Keithley measurement interval to 115 mS to avoid confusion of seeing dummy Keithley integration signals.Otherwise the Keithley had all the default settings. The Keithley LEDs showed 00.0000 volts.Attached Keysight screenshot KeithleyInput_50ohm_135mV.png demonstrates that the"Meter complete" signal indeed had period of about 115 mS.The screenshot shows four regions of pulses, each region of 16.67 mS duration.Obviously, these regions are related to the Keithley four integrations, each of 60 Hz period duration.According to the Keithley manual, they are "SIG ZERO", "CAL ZERO", "CAL" and "SIG" integrations.What is remarkable here is the amplitude of the signals. It is 135 mVpp on 50 ohm load.So the signals are not exactly feeble "ghost" ones.As is shown on the KeithleyInput_50ohm_20.8uS.png the pulses during the integration regions mostly come with period of 20.8 uS (48 kHz).During each 20.8 uS time the integrator output goes up and then down.The pulses appear at the moments of change from up to down and from down to up.The period is determined by the U17A and U18A on the Analog board, which divide3.84 MHz crystal Clock signal by 80.The 20 mVpp background seen on the screenshot is this 3.84 MHz signal,which is gated on the Analog board, and then counted on the Digital board.It is not clear how much these short duration pulses of noticeable amplitude leaking from the Analog Board to the Keithley input change the measurement results.They may affect the circuits inside the multimeter.They also may affect devices being tested.

author: bb1
author_rank: Regular Contributor
timestamp: September 19, 2024, 01:53:48 pm
content: Screenshots
Rigol MSO5000 series - rise time versus bandwidth for non-hacked 'scope - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: September 21, 2024, 06:22:00 pm
content: Sorry if this is a stupid question.My Rigol MSO5104 (100MHz and not yet hacked) has a -3dB bandwidth of 146MHz.I seem able to measure rise times down to ca. 800-1000ps for sharp pulses.So, the software is limiting the BW to 100MHz nominally, but am I correct that the 350MHz hardware front end can indeed measure rise times within its hardware capability?I'm judging the 'hardware capability' to be roughly determined by 350E6/0.4 = 1.2ns, or clearly slightly better if it does exceed 350Hz.
Found: Trak Rubidium GPSDO Manuals Wanted - Page 1
Forum section: electronics / testgear

author: ZGoode
author_rank: Frequent Contributor
timestamp: September 13, 2024, 04:27:21 am
content: I just got my hands on a Rubidium GPSDO made by Trak, which appears to have been bought by Smithsinterconnect. I can't find anything on the internet about this thing outside of one or two articles and a brief two page datasheet that doesn't give much information. I want to figure out how to talk with it over RS232 and/or Ethernet as well as what the specs on the antenna are, since what I can see is that it uses a TNC connector and appears to require an active antenna?I have it hooked up to my frequency counter right now with no antenna, which means no GPS lock, but it appears very stable at about +/- 0.2 milliHertz

author: ZGoode
author_rank: Frequent Contributor
timestamp: September 18, 2024, 04:17:19 pm
content: I finally got ahold of Smithsinterconnect through their sales department and they sent me the manual. I have uploaded it to my question about antennas on the RF section of the forum
Help.  Agilent U1252B  eeprom dump - Page 1
Forum section: electronics / testgear

author: hlj.pycad
author_rank: Contributor
timestamp: May 24, 2024, 01:28:30 pm
content: I've messed up with my U1252B completely when I try to fix the resistor read a dozen of Mega when probe was opened. And I want to try copy the calibration data from another U1252, but I don't know which IC is, any hints about that ?Is it this one? s93c86, it's an eeprom, the cap block the clutch readout without soldering, so i want to confirm before any soldering.It's a s93c86 8KB eeprom, and can read out without anything breaking by a clutch and CH341 programmer, if you've never dumped it, you should before do any calibration...U1252B and U1253B will do, it's almost the same version but U1253B has a nice OLED screen.

author: hlj.pycad
author_rank: Contributor
timestamp: May 24, 2024, 04:03:42 pm
content: I grided out the clutch a bit, then I can set it up, does this eeprom dump contains calibration data?

author: hlj.pycad
author_rank: Contributor
timestamp: May 24, 2024, 04:26:58 pm
content: Now I am pretty sure that eeprom ic store the calibration data, I dump it then do another calibration for the Voltage of "short" and "3V", the calibration count was 56, which is "0x38", and there is a 0x38, it became 0x39 (57) after another calibration, and some bits changed as well, I reckon those are calibration data.Because the other u1252 is U1252A instead of U1252B, it would be very nice if anyone can dump me a U1252B eeprom data...

author: gamalot
author_rank: Super Contributor
timestamp: May 24, 2024, 05:53:42 pm
content: This is from my U1235B, good luck.

author: hlj.pycad
author_rank: Contributor
timestamp: May 24, 2024, 06:41:14 pm
content: thank you. Unfortunately, the 1253B is different arrange from 1252B... And I tried my U1252A as well, can't use directly... upload it any way in case anyone want it someday..

author: janiorib
author_rank: Newbie
timestamp: September 18, 2024, 12:59:14 pm
content: Quote from: hlj.pycad on May 24, 2024, 06:41:14 pmHere is the copy of the EEPROM U1252B, do not notice the condition of the casing as it is practically rotten with age.More like and use he even has a UT181 next door.
Toellner TOE 8702 / 8704 Datasheet, Manual, Schematic wanted. - Page 1
Forum section: electronics / testgear

author: Noy
author_rank: Frequent Contributor
timestamp: June 11, 2020, 01:08:52 pm
content: Hi Guys,I'm interested in a Toellner 8702 / 8704 Power Supply. Sometimes they are in eBay. But unfortunally there is nowhere a Datasheet or a Manual or a Schematic available. Maybe someone have information for these models?Also sometimes there are TOE 8802 ones. Same thing there no information. What ist the difference to TOE 8702? They have Options but no Specification. Option 102 and Option 104 is described nowhere.

author: Noy
author_rank: Frequent Contributor
timestamp: June 11, 2020, 01:10:06 pm
content: Another question does somebody know the type of the used Banana sockets Here:

author: ApertureScience
author_rank: Contributor
timestamp: September 18, 2024, 10:10:17 am
content: If anyone is still looking, I uploaded the manual tohttps://elektrotanya.com/. Will also upload to xdevs soon!
Anyone recognizing this 12-pin instrument connector? - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 18, 2024, 07:08:34 am
content: Hi,Does anyone happen to recognise this instrument connector (type, brand)? It has 12 pins in 4 rows (2-4-4-2), a larger notch/key at the right upper corner, and smaller notches at three other corners.It's present on the Racal 6103 Digital Radio Test Set and used to power a mobile phone and communicate with it (using the Agilent E6392-60001 accessory).I already took a quick browse through some supplier's catalogs but did not yet find this type.Thanks!Rudi

author: Psi
author_rank: Super Contributor
timestamp: September 18, 2024, 07:23:03 am
content: Pretty sure the brand is Hirose, or at least, Hirose make something quite similar RP13A-12PD-13SC however your one is 12P and that one is 13p.It might be something custom. Have a look around the Hirose website.It's also possible Hirose are making a copy of some other connector design. So keep that in mind.The fact that the keyways are arcs on your one and square on this one makes me wonder if Hirose is copying the design of someone else

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 18, 2024, 07:35:39 am
content: Thanks a lot Psi!Indeed, this Hirose connector looks like it is the same one! And, unless I am mistaken, the one you refer to actually has 12 pins, just like mine (not 13).Perhaps not surprising there is a Japanese connector on this device. Even though it is a Hewlett Packard (/Agilent) device, it says it is made in Japan and also inside several PCBs have "Made in Japan" written on them ;-)Best Rudi

author: Psi
author_rank: Super Contributor
timestamp: September 18, 2024, 07:37:31 am
content: na RP13A-12PD-13SC is 13pin, i checked.Row of 2Row of 4Row of 4Row of 3.Your one only has 2 on the bottom row.

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 18, 2024, 07:42:40 am
content: Oh, sorry, I was indeed looking at another one, RP13A-12PD-13SC, as sold fromTME.That is one one I am looking for! (At least, a plug that goes in there ;-)Thanks again!

author: Psi
author_rank: Super Contributor
timestamp: September 18, 2024, 07:46:19 am
content: ah, i see. RP17 is 12pDigikey has some Hirose RP17 plugs and connects. See if any of those looks right.

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 18, 2024, 07:51:41 am
content: Thanks again; this has been very helpful!Case closed
Recomendations Please - Power Measurement & Phone Measurements - Page 1
Forum section: electronics / testgear

author: Gramo
author_rank: Newbie
timestamp: September 18, 2024, 03:19:03 am
content: Hi all,I'm looking to add two new tools to my electronics bench and would appreciate any recommendations:Power measurement/analysis tool:Something like the Otii Arc, USB connected with an optional external power source (25W+ @1.8-5+V). Ideally, it should have software and a GUI for viewing power over time, with features like click-and-drag sections to view watt-hour totals, similar to a scope.Phone-pairable measurement device:A modern, well-supported tool for measuring voltage, current, and DMM tasks. I'm thinking of something along the lines of the Mooshimeter, but more up-to-date.I did some light searching on the forum, though it gets a bit decentralised and dated in some conversations. Looking for "today's" sort of advice based on recent experiences/recommendations. Thanks in advance for your suggestions.

author: Zucca
author_rank: Unknown
timestamp: September 18, 2024, 03:25:33 am
content: Don't know your user case, but I would never touch a paired phone DMM for serious stuff.

author: shabaz
author_rank: Frequent Contributor
timestamp: September 18, 2024, 04:19:33 am
content: Only addressing the second bullet-point:Keysight U1282A has Bluetooth (separate plug-on interface) and it's good, impressive multimeter. But pricey. Has the capability to add a formula for conversions on-the-fly.Far cheaper, Multicomp MP730624 has built-in Bluetooth, is quite low-cost (about $60; and surprisingly accurate for that price) and Iwrote an appthat works on all normal desktop/tablet and mobile devices (apple devices annoyingly first need the purchase of a third-party app called WEBBLE from the app store, but it costs just a few $).
Are there any 30$ ish amplifier modules for up to 500kHz? - Page 1
Forum section: electronics / testgear

author: eTobey
author_rank: Super Contributor
timestamp: September 17, 2024, 05:51:05 am
content: I am thinking of using it with a functiongenerator.I would be happy with 2W, and +- 5V.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 17, 2024, 12:45:49 pm
content: but not 30 ishand too high power ....https://www.aliexpress.com/i/4000019808949.htmlhttps://www.aliexpress.com/i/4000590155430.htmland some can be found on fleabay ? some have gain controls ?50khz ??https://www.ebay.ca/itm/182412356272?Feeltech FPA series

author: eTobey
author_rank: Super Contributor
timestamp: September 17, 2024, 04:12:45 pm
content: Thanks for those links.The first item is denied by ali express in my country!The juntek has 2x gain? Can it be disabled without compromising the performance?

author: voltsandjolts
author_rank: Unknown
timestamp: September 17, 2024, 04:29:52 pm
content: Schematic is here:https://www.eevblog.com/forum/testgear/juntek-dpa-2698-10mhz-signal-amplifier-digilent-analog-discovery/msg3649978/#msg3649978Minimum non-inverting gain on the LM7171 is specified as +2
Free Operating and Service Manual HP1722B Oscilloscope - Page 1
Forum section: electronics / testgear

author: TerrySt
author_rank: Regular Contributor
timestamp: May 10, 2024, 10:56:33 pm
content: I found an original Operating and Service Manual for an HP1722B oscilloscope. I don't own that model so I don't need it. Free to anyone that is willing to pay the shipping. In pretty good condition, although the pages are loose from the binding. Probably someone separated them to scan or copy. Or maybe just the years. I think all of the pages are still there. The pages are are still very clean and clear. If you've ever tried to troubleshoot using an online scanned manual, you know how nice it is to have the real thing.PM me if you want it.Terry

author: TerrySt
author_rank: Regular Contributor
timestamp: September 17, 2024, 05:01:51 pm
content: Claimed
Tektronix THS3012 THS3014 THS3022 THS3024 Windows 10, Windows 11, x64 drivers - Page 1
Forum section: electronics / testgear

author: patpat
author_rank: Contributor
timestamp: September 16, 2024, 06:15:00 pm
content: I recently got a THS3024 and accessing the console or running its software from Windows 10 and 11was not possible because drivers were only available for old Windows versions.The Scope has an internal FTDI chip converting USB<->RS232.The old XP/Win 7 drivers provided by Tektronix are just the FTDI drivers but using Tektronix hardware identifiersVID_0699&PID_3012="Tektronix THS3012 oscilloscope"VID_0699&PID_3014="Tektronix THS3014 oscilloscope"VID_0699&PID_3022="Tektronix THS3022 oscilloscope"VID_0699&PID_3024="Tektronix THS3024 oscilloscope"I took the modern x64 FTDI drivers, added Tektronix IDs and it worked.For installation just run "install_3.cmd" on an elevated prompt (for this just open a cmd instance as admin)For de-installation you can run FTDI CDMUninstallerGUI_v1.5.exe adding the corresponding Tektronix identifier ( VID & PID #s) from the ones mentioned before.After driver installation and connecting the scope to the Windows 10/11 x64 PC you'll see the Tektronix THS3000in the Device Manger as shown below.Console access and Tektronix Openchoice Desktop Application TDSPCS1 - V2.8 workBest,Pat

author: norbert.kiszka
author_rank: Frequent Contributor
timestamp: September 16, 2024, 06:46:33 pm
content: Can it run under a Linux?

author: patpat
author_rank: Contributor
timestamp: September 16, 2024, 07:33:13 pm
content: The ones uploaded here are just Windows 10/11 x64 drivers.But having the hardware IDs mentioned before and following the FTDI instructions for Linuxhttps://ftdichip.com/wp-content/uploads/2020/08/AN_220_FTDI_Drivers_Installation_Guide_for_Linux-1.pdfit can be done.Do you know of any Linux software working on THS3000?Best,Pat

author: norbert.kiszka
author_rank: Frequent Contributor
timestamp: September 17, 2024, 07:04:13 am
content: Quote from: patpat on September 16, 2024, 07:33:13 pmFirst of all, Linux is not the name of a full system. This is a kernel only. Android is also Linux based.There is a lot of scope software working both under GNU/Linux and under Android.If that would be me, I would check scope manufacturer webpage and manual first. I don't have any Tek currently.

author: patpat
author_rank: Contributor
timestamp: September 17, 2024, 04:00:50 pm
content: It is clearly indicated the posted drivers are Windows 10/11 x64.You do not have a THS3000 but asked about Linux driversNow you are lecturing me on Linux and Android differences andsent me to the manufacturer website to find scope software I do not need.Are you trolling me or you just had a bad breakfast? ;-)
Hameg HM203-5 Manual - Page 1
Forum section: electronics / testgear

author: nunolopez
author_rank: Newbie
timestamp: September 17, 2024, 01:07:48 am
content: Hello, I am looking for the Hameg HM203-5 manual in English, as I was only able to find the German version

author: EvgenyG
author_rank: Regular Contributor
timestamp: September 17, 2024, 03:31:04 am
content: Hi and Welcome to the Forum!203-5 is a very basic scope, with industry standard controls layout. Anything specific you're looking for?I am sure 203-6 or 203-7 manual should answer all your questions. If it does not, you're welcome to ask here.
Does anyone have artwork for the Tek 465/465B Vertical Atten Knob Skirts? - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: September 12, 2024, 11:42:14 pm
content: Does anyone have artwork for the Tek 465/46B Vertical Attenuator Knob skirts? Or better yet has replacement knob skirts for sale? At one time they were on eBay butthey aren't there any longer.I have 4 scopes that are otherwise mint that have bad skirts, either broken or lettering rubbed off.SamW3OHM

author: tggzzz
author_rank: Super Contributor
timestamp: September 12, 2024, 11:54:20 pm
content: I have a 475 skirt. I suspect if you delete the "100" then it will work.Unfortunately the forum won't allow .odg files (for you to edit) as attachments. Oh well.

author: Kim Christensen
author_rank: Super Contributor
timestamp: September 13, 2024, 12:43:30 am
content: Can't you just ZIP the .odg file and attach that?

author: tautech
author_rank: Super Contributor
timestamp: September 13, 2024, 12:49:14 am
content: Quote from: Kim Christensen on September 13, 2024, 12:43:30 amYup, you'd expect a member with 20k posts to know how to work around forum filetype limitations. Oh well.Just adding a .txt and uploading it here with a note to remove the txt extension has worked here forever.....

author: xrunner
author_rank: Super Contributor
timestamp: September 13, 2024, 12:50:17 am
content: Quote from: Kim Christensen on September 13, 2024, 12:43:30 amYea - As far as I know you can do any file like that. I know I've gotten around it with other file types like that.

author: tggzzz
author_rank: Super Contributor
timestamp: September 13, 2024, 09:28:59 am
content: I haven't tried to upload any executable files to this forum before. The zipfile and similar techniques have failed in the past, so I didn't repeat the attemptshere.I'm not going to apologise for not knowing the different workarounds on each and every website/forum that I use.Anyway, save the attachment, remove the .txt suffix, and hope it is is useful.

author: scopeman
author_rank: Frequent Contributor
timestamp: September 17, 2024, 12:52:39 am
content: Thanks to all. I think I figured out on my own how to create the artwork.Sam
Old Uni-T 33a Multimeter cant find photos PCB and Switch contact arrangements  - Page 1
Forum section: electronics / testgear

author: modz786
author_rank: Regular Contributor
timestamp: September 21, 2024, 08:45:08 am
content: We all started with our first meter and I did with the Unit 33a not the latest 33a+The switch sprung contacts fell off so a photo of the correct placement is what im looking for.Also a pcb photo would be nice tooIf anyone has the 33a and would take some photos it would be very appreciated.Many thanks all
Topic: Keysight HD3 series - licence , have anyone tried to hack that scope ? - Page 1
Forum section: electronics / testgear

author: Zucca
author_rank: Unknown
timestamp: September 04, 2024, 05:58:07 pm
content: Quote from: EEVblog on September 04, 2024, 10:21:51 amThis is the thread place holder about what it will certainty happen.

author: Zucca
author_rank: Unknown
timestamp: September 16, 2024, 01:45:08 pm
content: https://www.eevblog.com/forum/testgear/new-keysight-infiniivision-hd3-oscilloscope/msg5641825/#msg5641825https://www.eevblog.com/forum/testgear/new-keysight-infiniivision-hd3-oscilloscope/msg5641793/#msg5641793
HP 8111A function generator transformer secondary winding voltage? - Page 1
Forum section: electronics / testgear

author: tnsilver
author_rank: Newbie
timestamp: September 15, 2024, 10:46:23 pm
content: Hi all. I was gifted a shot 8111A with a blown RIFA AC capacitor that had probably damaged the transformer. I'd really love to restore this unit but the secondary winding outputs 38VAC, which seems too high. The SM doesn't mention the trafo voltage but the regulator board seems to expect unregulated 23V after initial rectification.Does anyone have an idea? How about a replacement transformer? What would be the power and secondary winding voltage specs?Thanks in advance. Tom.

author: pqass
author_rank: Super Contributor
timestamp: September 16, 2024, 01:18:42 am
content: See attached for a stitched schematic fromhere(pdf page 303-305). It's wide. View the image in a separate tab and zoom in if necessary.Flaming RIFA caps (before the transformer) don't usually kill transformers. They might trip your panel breaker since it's directly attached to the IEC receptacle (see page 263). I believe the FLI box in the schematic houses R1 and C1 since I can't find "FLI" in the component lists. Their use here is only for RFI suppression so you can cut it out temporarily (order 0.047uF class X2 safety cap) and get on with further troubleshooting.The transformer secondary looks pretty straightforward; one winding with center tap and symmetrical intermediate taps.The two symmetrical intermediate taps and outer winding feed their own full bridge rectifiers with center tap being GND.With any troubleshooting exercise, start with confirming that the power rails are within spec. Although you don't know what the transformer secondary taps should be, you can infer that they should be symmetrical since the regulated outputs are. Start with documenting all winding outputs, if any are missing or aren't symmetrical.I'd disconnect the J1 connector from the board and measure: (multi-meter set to ACV)(a) pins 1,2 should be double that of 1,3 and 2,3(b) pins 5,4 should be double that of 5,3 and 4,3So were you measuring 38VAC between J1 pin 1 (or pin 2) and pin3 (GND)? ie. bridge AC input and GND?If so, that's the peaks, therefore the VRMS is just 27V (38*0.707) so just 4V above +23V regulated output. This seems reasonable.If the transformer secondary taps are all available and reasonable then reattach transformer J1 and measure all regulator outputs: +/-23VDC, +/-15VDC, +5/-5.2VDCWhat lead you to believe that the transformer was bad? Are you not seeing any activity on the front panel?
evision-webshop.eu - Page 1
Forum section: electronics / testgear

author: ptluis
author_rank: Frequent Contributor
timestamp: September 15, 2024, 05:01:07 pm
content: evision-webshop.euHas anyone bought from this store? Are they trustworthy?

author: egonotto
author_rank: Super Contributor
timestamp: September 15, 2024, 05:29:03 pm
content: Hello,I have purchased a Micsig Scope from eVision Systems GmbH - Jahnstr. 12 - 85661 Forstinning b. München. It worked without any problems.Best regardsegonotto

author: ptluis
author_rank: Frequent Contributor
timestamp: September 16, 2024, 05:17:28 pm
content: Quote from: egonotto on September 15, 2024, 05:29:03 pmWhat micsig did you bought? I'm ordering a TO2004, the TO3004 is above my budget although it costs a small amount more I don't need 300MHz bandwidth

author: egonotto
author_rank: Super Contributor
timestamp: September 16, 2024, 05:23:18 pm
content: Hello,I have bought an MHO3-2504.Best regardsegonottoQuote from: egonotto on March 05, 2024, 01:57:42 am

author: ptluis
author_rank: Frequent Contributor
timestamp: September 16, 2024, 07:00:19 pm
content: Quote from: egonotto on September 16, 2024, 05:23:18 pmThat's a really nice scope! I've also looked at MDO series but I need a battery operated scope so I have to live with the To series and 8 bitsThank you for your time
Awesome microscope with tilt and swivel - Page 1
Forum section: electronics / testgear

author: nixxon
author_rank: Frequent Contributor
timestamp: September 13, 2024, 07:50:02 pm
content: This has to be the most impressive optical microscope (for soldering jobs) anyone has ever seen...https://youtu.be/m3Ny3j5nH0U?si=YBedyokDDlsQpePG

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 13, 2024, 07:56:48 pm
content: For the price tag, it better be.

author: thm_w
author_rank: Super Contributor
timestamp: September 13, 2024, 09:46:05 pm
content: Wrong forum:https://www.eevblog.com/forum/reviews/and you can paste the full link:Similar product here:https://www.eevblog.com/forum/reviews/3d-lens-microscope-camera-anyone-tried-this-technology/But not as good as this.
34972A with 34901A 20CH card:  Extra relays [193:199]?  - Page 1
Forum section: electronics / testgear

author: smoothVTer
author_rank: Regular Contributor
timestamp: October 27, 2022, 06:33:06 pm
content: Recently I replaced all the relays on the 34901A 20CH card. Everything went smoothly and the card works 100% After using SCPI to resett the relay count on the card, which is installed in slot 1, I query the relay count through the front panel for Channels [101:122]During this relay-count browsing operation I saw additional channels in the RELAY COUNTS menu.Channels "1", "2" and "3" correspond to three internal relays on the PCBs inside the 34972A, which have ref designators "K102", "K103" and "K104" This is apparent from the service manual and the user guide for the 34972AHowever, at the tail end of the RELAY COUNTS menu as I'm scrolling through, there exists additional relays with counts on them: Looks like channels [193:199] also have counts on them. But I cannot find any documentation or reference in either documents I mentioned above as to where these 7 relays exist. I only see three relay symbols in the 34972A schematics for the aforementioned channels [1:3] but nothing for [193:199]What are these channels [193:199]? Are they real or are they virtual? Where do they exist on the PCBs and does anybody here know their function?

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 12, 2024, 11:36:51 am
content: A bit late to the party, but I just traced this out on a few boards today for the same reasons. Replacing relays etc...I think I got it mostly figured out...Also, Schematics attached.34901A01 - 20 = K401 - K420 (Omron G6SU-2-DC3)21 - 22 = Unsure, but appears to be relay 95 maybe?93 = K523 (Omron G6S-2-DC4.5)94 = K524 (Omron G6S-2-DC4.5)95 = K522 (Omron G6S-2-DC4.5)96 = K521 (Omron G6S-2-DC4.5)97 = K423 (Omron G6S-2-DC4.5)98 = K421 (Omron G6S-2-DC4.5)99 = K422 (Omron G6S-2-DC4.5)34908A01 - 40 = K401 - K420 (Counted 1-20 for first contact for each relay in order, then 21-40 for the second contact of each relay in order) (Omron G6SU-2-DC3)98 = first contact of K421 (Omron G6S-2-DC4.5)99 = second contact of K421

author: TizianoHV
author_rank: Regular Contributor
timestamp: September 13, 2024, 02:03:47 pm
content: I checked my 34901A. I can't figure out how they assigned channels 193-194-195-196.Attached the relay cycles values when switching functions if someone is smarter.
Very slow measurement from Rigol MC3065 DMM - Page 1
Forum section: electronics / testgear

author: stevessp
author_rank: Newbie
timestamp: September 12, 2024, 08:10:56 pm
content: Taking a voltage reading on this instrument is taking over 3 seconds which is an eternity. Haven't been able to figure out a way to speed it it up from the documentation. Anyone have any ideas?Thanks.

author: TurboTom
author_rank: Super Contributor
timestamp: September 12, 2024, 09:00:52 pm
content: You can set the integration time of the DMM module. Search the manual for "PLC" (Power Line Cycles) or see page 2-24 for further information on that topic. If this doesn't solve the problem, you may check if the measurement uses a trigger function to take readings at predetermined intervals. Setting up an M300 system can be a real PITA... Confusing to tell the least.

author: stevessp
author_rank: Newbie
timestamp: September 12, 2024, 10:04:11 pm
content: Thanks. Doesn't that only apply to DC though?

author: TurboTom
author_rank: Super Contributor
timestamp: September 13, 2024, 01:05:36 am
content: I'm not sure. But since there's the RMS/DC converter contained in the DMM and thus the AC measurement is internally also a DC measurement, the integration time should apply here as well.
Better not: ATTEN APS15-3A - Page 1
Forum section: electronics / testgear

author: Phil1977
author_rank: Frequent Contributor
timestamp: September 13, 2024, 12:51:51 pm
content: I thought I could use a small linear power supply for the bench and got a good offer from a quite reputable German supplier: The ATTEN APS15-3A.From the first glance it looked like a no-brainer: 15V, 3A, analogue current meter, digital voltage meter.But looking inside changed the mood:- A really chaotic design. The device uses 5 (five!) PCBs, partially connected with flexPCBs.- Mains lines directly touch PCBs on the secondary side so that soldered pins scratch on the insulation - and that´s no double or reinforced insulation (see second pic)- The 5V for the USB-port are generated with a switching mode buck converter (XL4015E). Usually I'm not afraid of switching mode DC DC's, but if I explicitly buy a linear power supply then it should be completely linear.- The 5V of the USB-port are not galvanically isolated- No constant current mode, only overcurrent protection- The transformer has a quite loud humThere are also a few positive points:- The control of the output voltage is set by a digital encoder. In it´s fine-setting (by pressing the button) the voltage can be controlled in 2.5mV-steps.- No ripple of the XL4015 is visible on the main output with a standard scope in AC-coupled 10mV/div settings.- The fan is temperature controlled- Nice compact form factor- A beeper warns you when the OCP is triggered
Hantek DSO2D15 FM modulation issue - Page 1
Forum section: electronics / testgear

author: iw2evk
author_rank: Contributor
timestamp: August 24, 2024, 12:42:51 pm
content: Hi all,The internal Signal generator on May Dso2D15 scope work fine in AM modulation but have a FM modulation issue.When i choose a deviation less the 30 kHz the Signal it's not modulated.Over +/- 30 khz work fineThis is a problemi during test of FM VHF UHF transceivers where the FM modulation it's max +/- 5khz.Someone know a solution ?i've contacted via mail hantek with no reply.ThanksRoberto

author: Aldo22
author_rank: Super Contributor
timestamp: August 24, 2024, 01:34:56 pm
content: Why do you think the signal is not modulated?I can't reproduce that here.

author: iw2evk
author_rank: Contributor
timestamp: August 24, 2024, 01:42:19 pm
content: Hi,with a 50cm wire place as antenna in bnc and a transceiver near i can't hear the fm +/- 5khz modulated signal from 1 khz tone.If i setting +/- 75 khz deviation and hear with a standard home fm receiver i've a cristal clear note on speacker.So i suppose a issue in low level modulation.if you have a HF transceiver make yourself this test..Note :for 88-108 Mhz setting are Fout 10,7 Mhz (i.f.) deviation +/- 75 khz tone modulation 1khz (heard Ok)for transceiver Fout 24 Mhz deviation +/- 5khz tone modulation 1khz (no audio in transceiver)

author: Aldo22
author_rank: Super Contributor
timestamp: August 24, 2024, 02:42:26 pm
content: Are you sure this has to do with the Hantek AWG?I don't have an RF transceiver and don't know much about it.I can only measure with the TinySA that the modulation is there.

author: iw2evk
author_rank: Contributor
timestamp: September 11, 2024, 11:45:15 am
content: Yes,the minimum modulation in Fm it's +/- 5,6 khz .Under this limits the modulation it' s NOT applied to carrier (no tone received in radio).Over the tone appears ..Try to generate a Fm signal at 10,7 mhz and receive with a fm 88-108 mhz radio place in contact tp the central of bnc output with a shorth piece of wire.Then decrease the % of modulation and listen..

author: Aldo22
author_rank: Super Contributor
timestamp: September 11, 2024, 03:15:00 pm
content: I can't help you anyway.Have you tried contacting zhangqiang@hantek.com?
Fluke 189 firmware - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: September 10, 2024, 03:04:18 am
content: Hi I have two Fluke 189 meters, one meter it has 2.01 firmware, other it has 2.02, exist update software? like 289. Regards

author: coromonadalix
author_rank: Super Contributor
timestamp: September 10, 2024, 11:53:58 am
content: unless you clone some eeproms, you wont find any updates for the 189 ... unless Fluke update them, witch i would doubtthey are obsoletesand doing so, you may loose the calibration ...let them be ... don't touch anything

author: Fungus
author_rank: Super Contributor
timestamp: September 10, 2024, 02:23:16 pm
content: Quote from: rauldm on September 10, 2024, 03:04:18 amNo.

author: Njk
author_rank: Frequent Contributor
timestamp: September 10, 2024, 07:53:19 pm
content: According to Fluke, "U16, mask ROM micro controller with 2k x 8 bytes RAM, Sharp SM6004, contains operating code for the product". That's why.

author: BeBuLamar
author_rank: Super Contributor
timestamp: September 10, 2024, 10:34:06 pm
content: How do you check the firmware version? I can't find it in the manual.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 10, 2024, 11:52:16 pm
content: mmm was it when you power the meter with an pressed button ? sorry don't have theses anymore ... but i did saw something once

author: rauldm
author_rank: Regular Contributor
timestamp: September 11, 2024, 01:49:40 am
content: Quote from: BeBuLamar on September 10, 2024, 10:34:06 pmHi, I get the firmware version from fluke app

author: rauldm
author_rank: Regular Contributor
timestamp: September 11, 2024, 01:50:44 am
content: Also you can see firmware version with Fluke viewforms software and Ir189USB cable, or with app with bluetooth adapter.

author: BeBuLamar
author_rank: Super Contributor
timestamp: September 11, 2024, 02:17:27 am
content: Thanks. My 189 is version 2.02. I got it around 2004 or so.

author: daisizhou
author_rank: Super Contributor
timestamp: September 11, 2024, 08:02:09 am
content: Quote from: rauldm on September 10, 2024, 03:04:18 amNormally I wouldn't update the firmware because it's not an Apple phone.Updating the firmware will only make things worse,In other words, even if the update does not improve any functions or performance

author: Njk
author_rank: Frequent Contributor
timestamp: September 11, 2024, 03:10:35 pm
content: Quote from: coromonadalix on September 10, 2024, 11:52:16 pmFirmware version:Push down the RANGE button and simultaneously turn the meter on.Static display test:Push down the HOLD button and turn the meter on.Animated display test:Push down the HOLD and BLUE buttons simultaneously and turn the meter on and wait a bit, must be hold down the buttons.https://www.eevblog.com/forum/testgear/fluke-187
making a new rubber holster, old Scopemeter - Page 1
Forum section: electronics / testgear

author: teus
author_rank: Contributor
timestamp: May 23, 2020, 01:17:56 pm
content: I have an old Philips/Fluke PM93 scopemeter here. The rubber holster got a crack. Trying to glue it, it started cracking in other places. It's dry like cork, and I wouldn't like to use it without the case, but I don't know how to go about it.Trying to recondition the rubber and keep gluing more seems pointless.If (!) I were able to find a new holster, it would probably be very old and brittle as well. Probably expensive too.So, errr, how can I fabricate a new holster?Designing and 3D printing an entire holster in ninjaflex would take a long time, and ninjaflex isn't cheap. cheap TPU seems too stiff for this.I could stitch a holster from a soft material, and would like some recommendations. Maybe thick dense neoprene?

author: AVGresponding
author_rank: Super Contributor
timestamp: May 23, 2020, 02:48:01 pm
content: I wouldn't count on a new one being so bad, the one on my PM99 (I'm assuming it's original but idk as I didn't buy the scopemeter new) is in excellent condition, aside from a few minor marks.Maybe yours has lived in a harsh working environment for part of its life?The PM93 and PM99 are the same case, so you could broaden your search to include those and the PM92/95/96/97/105 as well.The Fluke part number is PM9083/001, might be worth seeing if anyone has any NOS...

author: teus
author_rank: Contributor
timestamp: May 31, 2020, 10:57:19 am
content: Thanks for the part number. It doesn't seem to be available anywhere.

author: rainbow
author_rank: Contributor
timestamp: September 11, 2024, 02:44:35 pm
content: maybe this can help youhttps://www.thingiverse.com/thing:4620604

author: coromonadalix
author_rank: Super Contributor
timestamp: September 11, 2024, 02:52:01 pm
content: here they say they have some at $$$ priceshttps://www.radwell.ca/Buy/FLUKE/FLUKE/PM9083-DIV-001?redirect=truebetter 3d print this one ... but depends IF your really want an genuine one ?
HP 1720A SCHEMATIC 20 MISSING FROM MANUAL AND POWER ON ISSUE ADVICE - Page 1
Forum section: electronics / testgear

author: Tacoman1234
author_rank: Newbie
timestamp: September 10, 2024, 10:18:19 pm
content: Good afternoon all you smart fellers, I recently got at an estate sale tons of old electronic equipment. Among the mound was a hp 1720A oscilloscope. I have narrowed down the problem to the power board. Reading the manual the +15v seems to be the reference voltage for everything in this oscilloscope. The schematic for that circuit Is number 20 and my manual is missing the page. Does anyone have a picture of that page? I have read the theory page in the owners manual and I could possible look at the board once removed and trace it out but it would be alot easier with the Schematic. Thank you for any help

author: factory
author_rank: Super Contributor
timestamp: September 11, 2024, 12:44:09 pm
content: Have a look for the pdf manuals of the 1715A or 1725A, the 1715A uses a PSU board marked 01720, HP often used the same boards for more than one model, except for a few model specific boards.Some 1715A circuits here;https://www.vintage-radio.net/forum/showpost.php?p=946446&postcount=33David
Panasonic VP-7725B : Service or Operation Manual? - Page 1
Forum section: electronics / testgear

author: Wil_Bloodworth
author_rank: Regular Contributor
timestamp: September 06, 2024, 11:53:24 am
content: I'm having a hard time finding a user or service manual for the Panasonic VP-7725B. Anyone know where I can find one?Thank you!- Wil

author: Ritchievalens
author_rank: Contributor
timestamp: September 06, 2024, 11:16:10 pm
content: Hi thereIs it an Audio Analyser?I have a Manual here

author: Ritchievalens
author_rank: Contributor
timestamp: September 10, 2024, 10:59:44 pm
content: I guess you found one?I wanted to check I had the right one to send you
Review of T100 differential amplifier - Page 1
Forum section: electronics / testgear

author: CosteC
author_rank: Regular Contributor
timestamp: September 02, 2024, 06:35:16 pm
content: I got new version of T100 differential amplifier described here:https://www.eevblog.com/forum/testgear/cheap-chinese-oscilloscope-preamp-tear-downreview-is-it-any-good/New version has two LEDs at top: CHARGING and POWER.PDF as my patience for forum formatting is limitedThis version has amplifier with markings and redesigned power supply stage, questionably if for better - noise is still an issue.Hope it will help.Anything to be tested before I start tweaking this box?

author: thm_w
author_rank: Super Contributor
timestamp: September 03, 2024, 09:20:30 pm
content: Since its the same product, probably makes sense to just post in that thread?Maybe add some photos of the redesigned power stage and what noise you measured, thanks.

author: CosteC
author_rank: Regular Contributor
timestamp: September 04, 2024, 07:33:58 am
content: Well, it is updated version, behaves differently but not much better... I got some parts gathered, time is now the limiting factor

author: CosteC
author_rank: Regular Contributor
timestamp: September 10, 2024, 07:14:52 am
content: Yesterday attempt to play with component values was the failure.Each power rail has 50 Ohm resistor and SMD coil in series. 50 Ohm resistor is more important for noise reduction than coil, however causes loss of 0.35-0.6 V when in idle state.Removing 50 Ohms causes around twice higher output noise. No change in coil size, from available managed to help (up to 4.7 uH) Today maybe more experiments.
Voltech PM1000+ Software - Page 1
Forum section: electronics / testgear

author: billysdomain
author_rank: Contributor
timestamp: March 23, 2020, 05:21:17 pm
content: Hi all,Does anyone have the software for the Voltech PM1000+ by any chance?Voltech sold their power analyser branch to Tek in 2013 or so, and now they won't dish out the software.Tek has rebadged the product and called it a PA1000 now, but their software does not work with the PM variant.Would be really grateful to anyone who could let me have a copy, I have the ethernet, USB and GPIB ports on it.ThanksBilly

author: _Wim_
author_rank: Super Contributor
timestamp: March 23, 2020, 08:55:36 pm
content: Hi,I ran into the same problem with the PM6000 I bought. I did find the "IEC61000 Software for PM6000".exe file online, but it needs a licence code to run (I think this would also be the case for your PM1000+). The PM6VPAS software was available on the voltech forum for download, but doesn't do anything useful without a licence (only possible to save & load configuration parameters to the instrument). If you sent me a pm, I can provide you with these files, but I do not think they support the PM1000+.I have been wanting to write some software for it myself, but so far did not spent much time on that. Maybe with Covit19 I will find some additional free timeWhat features do you want from the software? Logging over time should be fairly issue to implement using the GPIB commands, some of the IEC Flicker & Harmonics features would be quite an effort.

author: coppice
author_rank: Super Contributor
timestamp: September 10, 2024, 08:22:40 pm
content: I've had a Voltech PM1000+ for quite a while, but I only just noticed you can download the related PC software from their web site. I installed it on a Windows 11 PC, but it just seems to start and immediately shut down, without an error message. Does anyone know if its just incompatible with Windows 11, or if there is something else that might prevent it running, I don't have access to any machines with older versions of Windows right now.
Is PeakTech 4250 actually Pico TA009 / TA018 ? (AC/DC current clamp) - Page 1
Forum section: electronics / testgear

author: rozwell
author_rank: Contributor
timestamp: August 29, 2024, 05:59:52 am
content: Hello there!I didn't find explicit confirmation so I decided to create this thread to be sure and so others won't waste so much time to figure this outFrom what I gathered, Pico TA018 and PeakTech 4250 have the same PCBs and the only difference seems to be BNC cable + extra shielding in Pico.They look like they come from the same factory (even fonts are the same) and I believe PeakTech 4250 is actually Pico TA009, but I didn't find any teardowns of TA009 to be 100% sure.Photos of PCBs in these threads match perfectly:Pico TA018:https://www.eevblog.com/forum/testgear/recommendation-for-a-reasonably-accuarate-dc-amp-clamp/msg5515303#msg5515303PeakTech 4250:https://www.eevblog.com/forum/testgear/peaktech-4250-acdc-current-clamp-teardown-and-repair/msg1398937#msg1398937Specs also seem to match.Because of that, I decided to order easily available (2 days shipping) PeakTech 4250 for half the price of Pico TA018 - which had like 2 weeks waiting time - and then upgrade it by replacing banana plugs cable to BNC & add shielding.Since they share the same issue with voltage regulator ripple (same design after all), I already arranged to get Pico TA018 from my brother in order to fix it for him and compare both units directly.Hantek CC-65 was also under my consideration but it was more expensive than PeakTech and with even more issues, especially DC offset drift.Any thoughts?

author: rozwell
author_rank: Contributor
timestamp: September 09, 2024, 06:11:50 pm
content: Photos stolen from the threads above.

author: Phil1977
author_rank: Frequent Contributor
timestamp: September 09, 2024, 06:24:25 pm
content: I´m quite happy with the PeakTech 4250.I did replace the cable by one with a BNC connector. Tested with a function generator it´s usable up to 25kHz for absolute measurements and well over 100kHz with a weaker response:https://www.eevblog.com/forum/testgear/peaktech-4250-calibration/The Hantek is even cheaper but lacks DC stability.The Tektronix current clamp goes up to 1.5MHz but for 20 times the money...
universal chip programmers with LInux support - how about Batronix ? - Page 1
Forum section: electronics / testgear

author: Hella_Wini22
author_rank: Contributor
timestamp: September 07, 2024, 05:05:08 pm
content: I've seen people talking about Batronix new scope series Magnova line ( sleek design, great display, 12-bit ADC, up to 350 MHz bandwidth, German quality etc).But I've noticed that they have their own lines of chip programmers, too.* [ Batronix Batego II ](https://www.batronix.com/shop/programmer/BX48/batego-II.html)Even though nowadays most of the things are programmed ISP, but still one ocassionaly needs to program a chip or three in the old fashion way.Until now, I figured that If I really need a new programmer, I'd have to cobble up something of my own and then gradually expand its capabilities, since nothing that I knew of could quite fulfill all of my needs, at least not in the lowest price or economy segment.But this thing looks darn close.* It can do oldest chips with 25V Vpp and newest FLASH that works at just 1.0V* has plentiful list of supported devices.* supports some ISP protocols* has a SW version for various Linux distros. Even for Gentoo. WTF ?* They developed their own pin-driver ASIC to cover all of the voltage span This is also a weak point - that's one part that can't be easily replaced on failure. 🙄* SW allegedly supports chip volume production & cluster programmingPrice is a bit steep for my taste(€660), but if it works as advertised, it seems to be awesome Swiss army knife, especially WRT its capabilities.So, my question is - has anyone here bought it and has experience to share ?How well does it run with Linux, especially with rolling distros like Gentoo, Ark etc ?Also, does anyone know of better/superior alternative ?Maybe Batronix is just trying to catch or copy some new player (unlikely, but I have to ask) ? 🙄

author: edavid
author_rank: Super Contributor
timestamp: September 07, 2024, 06:07:26 pm
content: Quote from: Hella_Wini22 on September 07, 2024, 05:05:08 pmI notice that it doesn't support 2708 or MCM68764, which are about the only 25V devices I'd like to program.

author: Hella_Wini22
author_rank: Contributor
timestamp: September 07, 2024, 06:36:20 pm
content: As stated on their page:"Chip updates on customer request Free via software updates"So obviously no one requested it yet.Or so it would seem.

author: madires
author_rank: Super Contributor
timestamp: September 07, 2024, 07:01:05 pm
content: I have one for many years and it works fine under Debian. The software is based on Mono. However, I had to install some additional Mono packages manually.

author: Squarewave
author_rank: Frequent Contributor
timestamp: September 09, 2024, 03:29:49 pm
content: I was looking at one of the 32 pin Batronix, noted the 32 pin programmers are read only for the D2716, wonder why that is?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 09, 2024, 03:44:15 pm
content: outside linux you have big brandsElnec Xeltec ... some of them do accept consumer requestsTnm 7000, RT809Hi think the tl866a or tl866cs had some linux love ??