hybridfree/eevblog-posts huggingface dataset:
Good and bad of Aneng AN9002 Bluetooth multimeter - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: January 22, 2024, 09:25:46 pm
content: Please see the attached pdf for PC and oscilloscope screenshots and discussion related to AN9002.

author: kermu
author_rank: Newbie
timestamp: July 08, 2024, 12:21:04 pm
content: Is this problem still present in the units currently sold ?RegardsChritopher

author: MiroS
author_rank: Regular Contributor
timestamp: July 08, 2024, 02:50:34 pm
content: ZT-300AB looks similar but there is no -1V offset
(Rebadged) Promax FAC-364B power supply - Page 1
Forum section: electronics / testgear

author: tatel
author_rank: Frequent Contributor
timestamp: June 29, 2024, 10:54:19 am
content: This power supply has been given to me. Being a Promax product, for sure it's rebranded. I would like to know what the original product is. Perhaps somebody is able to identify it. Please see picture on attachment.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: June 30, 2024, 11:18:47 am
content: If you open it up, you may find an OEM name, logo or part number on the PCB.

author: tatel
author_rank: Frequent Contributor
timestamp: June 30, 2024, 01:02:52 pm
content: Thank you very much for the suggestion... unfortunately it could be a true Promax product... the board is marked Promax OCC710 However I'm unable to find anything about it. Will try to contact them but not holding my breath.Anyway I took some more pictures, sorry for the quality on a couple of them. Perhaps they will be useful for somebody in the future.Best wishes

author: coromonadalix
author_rank: Super Contributor
timestamp: June 30, 2024, 04:20:57 pm
content: you want to calibrate it ??it is a basic psu seems based on op amp, and classic intersil 3 1/2 digit displaysreverse schematic is possible to do but will take time

author: tatel
author_rank: Frequent Contributor
timestamp: June 30, 2024, 08:31:35 pm
content: No, I'm just looking for any available information... easier than reverse engineering. Not that there are any wonders inside, of course

author: supertrabuco
author_rank: Contributor
timestamp: June 30, 2024, 09:37:33 pm
content: Hello, this source is original from Promax, a brand based in Barcelona, ​​and that still continues to make measuring instruments, I have the same one but with analog indicators and there is abundant information from these sourcesGreetings

author: tatel
author_rank: Frequent Contributor
timestamp: July 01, 2024, 02:13:25 pm
content: Hola supertrabuco, gracias por tu respuesta.Well, I'm unable to find anything about this device. I just contacted with Promax via web form. We'll see what the answer is. But, if you can give any pointers to any information freely available, I would greatly appreciate it.Un saludo

author: supertrabuco
author_rank: Contributor
timestamp: July 01, 2024, 08:42:33 pm
content: Hello, I have the manual for the FAC-304 A, which was very similar to the 364, I suppose that if Promax does not send you anything, I will be able to help you

author: tatel
author_rank: Frequent Contributor
timestamp: July 03, 2024, 12:59:15 pm
content: Promax people sent to me the manual and schematics. In spanish, of course. I'm attaching it, just in case...

author: supertrabuco
author_rank: Contributor
timestamp: July 07, 2024, 08:39:26 am
content: Hello, thanks for the manual, the regulation circuit is the same as mine, the only difference is what concerns the digital indicators, mine are analogue,I have had it since 1985 and although I now have others I still use it.Greetings
Artesyn NFS177-7630 PSU informations? (HP 35670A) - Page 1
Forum section: electronics / testgear

author: F1GWR
author_rank: Regular Contributor
timestamp: July 06, 2024, 10:49:04 pm
content: Hi,Anyone holding information, schematic, diagram of the Artesyn NFS177-7630?This unit being used in the HP 35670A DSA.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 06, 2024, 11:04:08 pm
content: maybe the EEVblog #536 and other video parts may give you some help2nd #5383rd #5404th #593

author: F1GWR
author_rank: Regular Contributor
timestamp: July 07, 2024, 07:46:05 am
content: Thanks for your reply. Did already watch the four parts video some time ago. The first one shows a PSU failure when connected to mains, but the DC-DC converter part still works. And the EEVblog kangaroo didn't repair his PSU, or at least video #5 was never released.Mine has complete failure (both mains and DC powered).However Mark Bielman in the HP-Agilent-Keysight-equipment groups.io list provided me with a schematic of a less powerful version of my NFS177, which I reproduce herewith. Thanks to him.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 08, 2024, 01:54:14 am
content: a tough cookie this one, no dedicated ic'swuuut
I've done it! Finally, a real Tektronix book! - Page 1
Forum section: electronics / testgear

author: Gianni
author_rank: Contributor
timestamp: March 02, 2024, 01:41:04 pm
content: Hi Guys,thanks to the trust of Elektor, one of the best known electronics editors, with my immense joy, a book of mine became reality...I mean: a real book, in real paper, not just a pdf file.I am incredibly happy with the result, which went beyond my expectations. Two kilograms, nearly 600 pages and a very high quality.If you like, you can buy it from here:https://www.elektor.com/products/tektronix-epic-oscilloscopesCurrently it says "out of stock" but it is coming.I wish to thank the Editor and the many who helped me in reaching this target

author: nctnico
author_rank: Super Contributor
timestamp: March 02, 2024, 02:05:31 pm
content: Really nice!Just be proud of your accomplishment, you've earned it fair and square!

author: Muxr
author_rank: Super Contributor
timestamp: March 02, 2024, 02:25:29 pm
content: Looks awesome. Congrats!

author: Grandchuck
author_rank: Super Contributor
timestamp: March 02, 2024, 03:24:14 pm
content: bravissimo Gianni

author: brabus
author_rank: Frequent Contributor
timestamp: March 02, 2024, 04:15:09 pm
content: Congrats Gianni!!Definitely getting one as soon as available!

author: mwb1100
author_rank: Frequent Contributor
timestamp: March 02, 2024, 04:22:43 pm
content: From someone who has no Tek scopes (but used to have a couple in various stages of disrepair), I can tell you that your e-books are amazing. The physical book looks to be as well!. Clearly a true labor of love.Congratulations!

author: Mr_Patata
author_rank: Newbie
timestamp: July 06, 2024, 03:25:26 pm
content: Buongiorno Gianni,la disturbo per chiederle un chiarimento: dalle immagini vedo che il suo bellissimo libro è con copertina rigida; io l'ho ordinato su Amazon con ISBN-13 ‏ : ‎ 978-3895765841 e mi dice che ha la copertina morbida.Ma esistono due versioni?Quella dal sito Elektor ha lo stesso ISBN e indica copertina rigida.Cosa e dove devo ordinare se voglio la versione con copertina rigida?Grazie infiniteCordiali salutiClaudio

author: axantas
author_rank: Regular Contributor
timestamp: July 07, 2024, 10:15:12 am
content: Apparently there are indeed two editions. The Amazon states "Paperback" at 53€, Elektor sells it for nearly 70€ with specs "gebunden" which says "hardcover to me. I would go for the more expensive version at Elektor then.Sembra che la edizione cara sia davvero quella con copertina rigida = "gebunden" in Tedesco.BTW: just discovered that book thanks to that question. I guess, I will order it at Elektor.EDIT:Just ordered the hardcover for 60€ at Thalia bookshop, the book is on sale there - don't know, whethere this is an option for you.
Tektronix 50R Current Loops for Current Probes - Page 1
Forum section: electronics / testgear

author: calibrationfixture
author_rank: Regular Contributor
timestamp: July 06, 2024, 08:42:10 am
content: Hi,Saw this "little" overpriced Item on eBay:https://www.ebay.com/itm/285474532694Cheaper alternatives (DIY is also possible): 015-0601-50 and the old 067-0559-00.https://www.ebay.com/itm/156271706359https://www.ebay.com/itm/156284375171There is also a 015-0601-00, but this is a Short Circuit one. No 50R Termination in the barrel.Calibrationfixture

author: tautech
author_rank: Super Contributor
timestamp: July 06, 2024, 09:09:55 am
content: This serves the same purpose to properly set up a current probe and adjust channel skew.There's even a thread here for a DIY version.

author: calibrationfixture
author_rank: Regular Contributor
timestamp: July 07, 2024, 06:46:14 am
content: Hi again,I forgot the 067-0865-00 Fixture. This will accommodate the bigger Current Probes:https://www.ebay.com/itm/276528516623https://w140.com/tekwiki/images/8/8b/Tek_067-0865-00_datasheet.pdfCalibrationfixture
WFM file format for Rigol DHO800/900 oscilloscopes - Page 1
Forum section: electronics / testgear

author: Lathe26
author_rank: Contributor
timestamp: July 07, 2024, 04:48:12 am
content: Below is partial documentation for theWFM file formatfor the Rigol DHO800/900 oscilloscopes. Its format greatly differs from prior Rigol scopes. Official documentation for this file does not appear to be available. This is from the v01.02.00.02 firmware.Once I realized that the WFM file format does not support the Logic Analyzer, I stopped researching it. Hopefully this work will still be useful to some folks.https://github.com/Lathe26/WFM_for_Rigol_DHO800_900
Info wanted on original Clarostat 240 Power Decade Resistance - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: July 06, 2024, 11:17:03 pm
content: I have an original Clarostat 240 Power Decade Resistance box - just model "240", not the "-B" or "-C" revision. It has the dials going from LSD to MSD, opposite of the later versions, serial number 1368 and am curious if anyone has any further information on this model. I can't locate anything other than the -C model - even in catalogs and am curious as to when this was first introduced. Really, any old Clarostat catalogs would be very interesting.Thanks!
FLUKE 6060b - Page 1
Forum section: electronics / testgear

author: sneily
author_rank: Contributor
timestamp: June 27, 2024, 04:36:00 pm
content: Newbie to EEVblog.Here is my question regarding the Fluke 6060b RF Signal Generator.Special function 09 is used to display the instrument's Software revision and Instrument ID number.SO, pressing "SPCL" , "09" on my 6060b keypad yields "2.1" for the software revision and "6060a" for the instrument ID.Does anyone else have a 6060b for which the software thinks it's a 6060a??Functionally, I definitely think I have a 6060b since the 6060a frequency spec is only 520Mhz and I can output to 1 Ghz.Cheers

author: wn1fju
author_rank: Frequent Contributor
timestamp: June 27, 2024, 05:08:47 pm
content: Mine says "3.0 6060b"

author: sneily
author_rank: Contributor
timestamp: June 28, 2024, 12:57:03 am
content: Thanks for confirming. My serial number is 3680013. I'll assume it's an early model.Its working fine. Just an oddity I guess.Cheers

author: Stray Electron
author_rank: Super Contributor
timestamp: June 28, 2024, 06:26:25 pm
content: Quote from: sneily on June 27, 2024, 04:36:00 pmHave you checked the output between 520 MHz and 1 GHz with a scope or something to be sure that it's on frequency and the amplitude is correct? I'm wondering if your 6060A onlythinksthat it's capable of 1GHz? I have a 6060A and I looked into upgrading it some years ago and I seem to recall that there was a significant amount of new hardware involved. But IIRC you could return the 6060A to the factory and have it upgraded to a 6060B so perhaps that was done with yours. I can't check mine at the moment since it's been years since I used it and I don't even recall where it's parked.

author: sneily
author_rank: Contributor
timestamp: July 05, 2024, 07:53:19 pm
content: Hi Stray Electron, my only O-scope is 20Mhz, but i have a $20 china frequency counter (PLJ-8LED) which I used as a functional check for the higher frequencies and I do get rf output at the higher frequencies.My intended use for the 6060b is for FM tuner alignments so I'm only using 108Mhz anyway.Cheers!
Chinese soldering station calibration procedure? YCD-8582D - Page 1
Forum section: electronics / testgear

author: agent29
author_rank: Newbie
timestamp: February 14, 2021, 02:26:44 pm
content: Hello,I acquired this second hand cheaply off eBay. I wasn't expecting much in the way of accuracy from its reported 200 degree to 480 degree range from the iron, however I was disappointed to discover the soldering iron was considerably inaccurate in relation to what it displayed.Upon inspection there are two 1K pots on the PCB configured around lm358's, one for the hot air gun and one for the iron. My issue however is the linearity of the measured temperature. If the iron is set to lets say 480 degrees the display and temperature match within a few degrees, (this was its calibration setting when received). However when set to 200 degrees the temperature of the iron is some 50-60 degrees above what's displayed.I adjusted VR1 (pot for iron) and manage to find a mid point around 330 degrees which provides an approximate equal +-30 degree deviation displayed at opposite ends of the temperature scale.Is there a correct mode or method of calibrating the display / ADC values to the temperature? I have pressed both + and - keys simultaneously (which results in just reducing to minimum temperature), tried this whilst powering on and a number of different methods to no avail? Is there a calibration mode at all?Can anybody assist?Many thanks

author: uhmgawa2
author_rank: Newbie
timestamp: July 05, 2024, 04:32:10 pm
content: There are at least two design versions of this unit. The earlier has adjustment pots on the PCB and the latter appears to support temperature calibration in firmware. Here is a manual scan for the latter unit:https://www.scribd.com/document/748177655/Mypovos-8588d-2-in-1-Soldering-Station
Leader LEM-73A Manual - Page 1
Forum section: electronics / testgear

author: cahlucas
author_rank: Newbie
timestamp: July 04, 2024, 05:53:45 pm
content: I recently bought a second-hand Leader LEM-73A electronic multimeter, and I miss the manual, especially the schematic. Attached is a photo of the device. I would like to know if anyone could help me with this. If possible, please in PDF format.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: July 04, 2024, 09:48:46 pm
content: Close?

author: cahlucas
author_rank: Newbie
timestamp: July 05, 2024, 02:19:12 pm
content: This is the manual of the LEM-75A, I think in Spanish. I also discovered this manual on the internet, what concerns me is really the manual for theLEM-73A. The difference is that the LEM-73A has the ability to perform Ohm measurements with high and low voltage, and the LEM-75A does not. You can measure PN transitions with the high voltage (1.5 V), but not with the low voltage (88 mV). This opens up the possibility of measuring resistances without opening PN junctions. So I'm still looking for a manual for theLEM-73A.
Pico log TC-08 logging graph has disappeared - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: July 05, 2024, 06:57:30 pm
content: Hi,I was data logging some thermocouple temperatures, and then i tried to adjust the axes of the pico log graph on the computer screen...but then the graph zoomed out, and then disappeared altogether.I can still see the axes, but not the data points.Do you know how to get the graph logging lines back?There's usually a "zoom to fit" button but not here.TC-08https://www.picotech.com/data-logger/tc-08/thermocouple-data-loggerThis doesnt help..

author: tggzzz
author_rank: Super Contributor
timestamp: July 05, 2024, 08:10:17 pm
content: Quote from: Faringdon on July 05, 2024, 06:57:30 pmNot using the "royal we" in this question?Either RTFM, or use gurgle, or turn off the electricity supply to your house, wait 30s, turn it back on. I suspect your best chance of success is with the 3rd alternative
UNI-T UT60BT Multimeter - Page 1
Forum section: electronics / testgear

author: Dave_g8
author_rank: Regular Contributor
timestamp: July 04, 2024, 12:43:34 pm
content: I don't know if this is specific to the UT60BT, but I have noticed that there is a sort of dead spot in the measurements.Example: DC CurrentOn the DC Current ranges, there is a minimum value before a reading is registered.- The minimum value before a reading is registered on the 999.9µA range is +/-0.8µA.- The minimum value before a reading is registered on the 999.9mA range is +/-0.8mA.- The minimum value before a reading is registered on the 9.999A range is +/-0.005A.This is not covered by the specification.This does not seem to be related to the resolution, since the readings are correct when above these minimum values.

author: Caliaxy
author_rank: Frequent Contributor
timestamp: July 04, 2024, 04:23:00 pm
content: Well, this is actually specified indirectly in the accuracy numbers. For instance, 0.8% accuracy on the 999.9µA range hints you not to trust any reading under 8.2µA (0.8%+3), because the instrument can display any random number there. In these instances, some manufactures choose to display "0", others just trust you that you won't take seriously those very low readings.On top of that, as a general rule, as you know, no measurement at the bottom of any given range (say under 5%) should be considered very accurate.

author: Dave_g8
author_rank: Regular Contributor
timestamp: July 04, 2024, 05:31:05 pm
content: Hi,Understood, but is the calculation only valid for a reading of 999.9uA.On the 999.9uA range, the reading is zero when less than +/-0.8uA, not 8.2uA as indicated from your calculation.If the current is 1uA for example, I would expect an accuracy +/- (0.008 + 3digits) = 0.3uA.Using another DMM as a reference (which may not be accurate), these are the measured readings.

author: electr_peter
author_rank: Unknown
timestamp: July 04, 2024, 07:37:41 pm
content: A% number in +-(A% + Bd) specification means % fromfull range, B means digits in least significant digit. Thus +-(0.8% + 3) on 999.9uA range is +-(8uA + 0.3uA) = +-8.3uA.And as mentioned by OP, some DMMs show 0 on purpose when actual reading is close to zero (your measurements indicate that UT60BT is in this category).

author: Dave_g8
author_rank: Regular Contributor
timestamp: July 04, 2024, 08:18:59 pm
content: Hi,Thanks for the information.My understanding was that the A% was % of the "reading" rather than a % of the full range.With the 0.8% specification, for reading 999.9uA, %=8uA, for 100uA, %=0.8uA etc..Calculation based on specification +/-(0.8%+3) attached.
Fluke 8505A rear analog connector specs? - Page 1
Forum section: electronics / testgear

author: haxtormoogle
author_rank: Newbie
timestamp: December 28, 2023, 12:43:24 am
content: I am looking for a proper mating connector so I can make use of the rear analog inputs on my Fluke 8505A.Anyone have the dimensional specs for this strange connector, or know its manufacture or part number?Hopefully still some company still producing them.

author: Wazza
author_rank: Contributor
timestamp: July 08, 2024, 04:14:40 am
content: Hi all,Just rummaging through eevblog re Fluke 8505 and found a question I could actually answer!The rear panel input socket is a 516 series 20 pin female connector made by EDAC.The mating plug is available as a 20 pin housing with the screwlocks, solder pins and the connector shell are seperate items.20 pin body : EDAC 516-020-000-302solder pins : 516-290-500plastic shell : 516-230-520metal shell : 516-230-620Regards,Waz

author: ch_scr
author_rank: Frequent Contributor
timestamp: July 08, 2024, 06:49:49 am
content: This one looks right:https://www.ebay.com/itm/325947602069
Rigol DHO924S bandwidth measurement - Page 1
Forum section: electronics / testgear

author: juhand
author_rank: Newbie
timestamp: July 01, 2024, 03:27:51 pm
content: Hi, I made a Rigol HDO924S bandwidth measurement.I used R&S SMB100A signal generator for source, and I calibrated with a R&S URV35.I used 0 dBm @ 50ohm, that issqrt(50*10^0/1000)=224mVrmssqrt(50*10^0/1000)*sqrt(2)*2=632mVppand I set the oscilloscope to 200mV/div.

author: TimFox
author_rank: Super Contributor
timestamp: July 01, 2024, 03:28:58 pm
content: And the answer was?

author: egonotto
author_rank: Super Contributor
timestamp: July 01, 2024, 03:47:30 pm
content: Quote from: TimFox on July 01, 2024, 03:28:58 pm303 +-5 MHz

author: Fungus
author_rank: Super Contributor
timestamp: July 01, 2024, 05:19:50 pm
content: My DHO804 measures at about 280Mhz when I tell it to be a DHO924.nb. I did it via a rise time calculation, I don't have a 300MHz signal generator.

author: J-R
author_rank: Super Contributor
timestamp: July 03, 2024, 08:39:48 pm
content: Quote from: Fungus on July 01, 2024, 05:19:50 pmMaybe pick up a tinySA Ultra?

author: Martin72
author_rank: Super Contributor
timestamp: July 03, 2024, 09:44:36 pm
content: It depends on how linear the thing itself is.

author: TimFox
author_rank: Super Contributor
timestamp: July 03, 2024, 11:01:07 pm
content: The usual (BW) x (Tr) = 0.35 formula for rise time vs. -3 dB bandwidth is not valid in general: it depends on the shape of the low-pass filter function.For the typical amplifiers used in analog oscilloscopes, it is reasonably accurate.

author: Martin72
author_rank: Super Contributor
timestamp: July 03, 2024, 11:30:19 pm
content: For most new scopes, you have to use 0.4....0.45 in the formula.This was the case with the DHO800 when I first measured the risetime and then the bandwidth with an R&S SML01.

author: Fungus
author_rank: Super Contributor
timestamp: July 04, 2024, 01:53:26 am
content: I used 0.45 in my calculation. I'm not going to argue 100% correctness but it gives amuchbetter answer than 0.35 when applied to these devices. Definitely in the right ballpark.FWIW: Other people have measured the bandwidth of these 'scopes using signal generators and all got numbers in the 280-300Mhz range when they're configured as a DHO924.My measured bandwidths using rise time calculation on a hacked DHO804:DHO804 125Mhz (70MHz sticker)DHO814 200Mhz (100MHz sticker)DHO914 225Mhz (125MHz sticker)DHO924 280Mhz (250MHz sticker)
Using Fluke 741/744 instead of standard references - Page 1
Forum section: electronics / testgear

author: klim
author_rank: Newbie
timestamp: July 05, 2024, 05:38:04 am
content: Hi, i got cheap Fluke 741 and 744 and asking myself if it can be used as reliable replacement for standard references like DMMCheckPlus or others.I know Fluke is missing some sources, like: AC Voltage, AC Current but what do you think about?Specification Fluke 744 as Source AccuracyVoltage DC 110.000 mV 0.01%+0.005% *1.10000 V 0.01%+0.005% *15.0000 V 0.01%+0.005% *Current DC 22.000 mA (Source) 0.01%+ 0.015% *22.000 mA (Simulate) 0.02% + 0.03% *Resistance 11.000 Ω 0.01% + 20 mΩ110.00 Ω 0.01% + 40 mΩ1.1000 kΩ 0.02% + 500 mΩ11.000 kΩ 0.03% + 5ΩFrequency 0.00 to 10.99 Hz 0.01 Hz11.00 to 109.99 Hz 0.1 Hz110.0 to 1099.9 Hz 0.1 Hz1100 to 21999 Hz 2 Hz22.000 to 50.000 kHz 5 HzDMMCheckPlusResistance : Four 0.1%, 10ppm precision resistors are included: 100Ω, 1.00KΩ, 10.00KΩ, and 100.0KΩDC voltage : 5V, ± 0.007% voltage referenceDC current : 1mA, ±0.1% current sourceAC voltage : 5V RMS, bipolar (+5V, -5V) square wave, ±0.1% voltage sourceAC current : 1mA RMS, ±0.2% current sourceFrequency : 100Hz, ±0.02% signal sourceDuty Cycle : 100Hz, 5V RMS, signal source has 50% ± 0.05% duty cycle
HANTEK DSO5202P SYSTEM IS NOT SHUT DOWN PROPERLY - Page 1
Forum section: electronics / testgear

author: alvarosantos
author_rank: Newbie
timestamp: July 03, 2024, 05:46:41 pm
content: The equipment was unused for a period of time, when turning it on the message appeared stating that it was not turned off correctly, I have already pressed f2 to restore factory defaults, however without success. I already downloaded the firmware from the official website to try to use the f3 option, but the file is not recognized.

author: Aldo22
author_rank: Super Contributor
timestamp: July 03, 2024, 06:42:17 pm
content: This video shows a similar problem.No idea if it is helpful.https://youtu.be/ofO1WbJ3Z5o
[ADVICE NEEDED] EMC analyser as a spectrum analyser ? - Page 1
Forum section: electronics / testgear

author: matthieu.e
author_rank: Regular Contributor
timestamp: July 03, 2024, 10:33:01 am
content: Hello,I am looking for a spectrum analyser. I also see a E7405A Agilent 9 kHz-26,5 EMC analyser.Can the EMC analyzer be use as a spectrum analyzer or is it a completely different instrument ? What are the differences ? Differences in performances ? Thank you.

author: matthieu.e
author_rank: Regular Contributor
timestamp: July 03, 2024, 11:13:34 am
content: Is the EMC analyser a spectrum analyser + the EMC option
BK Precision 1901B on/off - Page 1
Forum section: electronics / testgear

author: FrankBuss
author_rank: Unknown
timestamp: July 02, 2024, 11:27:16 pm
content: I bought a BK Precision 1901B, and looks like it works, but why doesn't it have a soft power on/off button as many other power supplies? I guess my fault for not reading the manual carefully.But looks like it is possible with the remote DIN connector. Thinking about to open it and drill a hole in the front for a button, but this might be a problem for warranty in case it breaks someday. Anyone who has a 190x? How did you solve this problem?There is also an USB input, haven't looked into it so far, maybe I can control it from PC?

author: slugrustle
author_rank: Frequent Contributor
timestamp: July 03, 2024, 12:58:14 am
content: Check out section 5.1.4, "Enable and Disable the Output" in the manual.For USB, check out the programming manual and associated control software.Docs and Software tab athttps://www.bkprecision.com/products/power-supplies/1901B

author: FrankBuss
author_rank: Unknown
timestamp: July 03, 2024, 02:17:31 am
content: Yes, I've read this, and I can build something, and probably glue a button on top to avoid problems with the warranty. Was just wondering why they didn't spend one dollar for an extra button for an 800 dollar power supply, and how others solved it.I could also feed it to an electronic load I have, which has a button
ZT-703S Screen Goes Dark Annoyance - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: July 02, 2024, 02:12:11 pm
content: ZT-703S Screen Goes Dark Annoyance. Just as I go to take a reading, the screen shuts off and I have to press any button. Auto-Off is set for half and hour. This is like a screen saver function. I cannot find anything for that in the menus.

author: RAPo
author_rank: Super Contributor
timestamp: July 02, 2024, 02:51:51 pm
content: Set BLTime to off (in 5th page of menu, see manual).

author: daveyk
author_rank: Frequent Contributor
timestamp: July 02, 2024, 03:48:46 pm
content: Thank you.I found that under the o-scope menu, but not under the DVM menu. I have not set it to off and will see if that also controls the DVM.Dave
Rohde&Schwarz: SFL-N (for SFL-T) - Page 1
Forum section: electronics / testgear

author: OliverWirthg
author_rank: Contributor
timestamp: July 01, 2024, 04:47:49 pm
content: Hello!I bought an older one and used R & S SFL-N (for R & S SFL-T). I opened the unit SFL-N for cleaning. On the main board of the instrument SFL-N there is a holder for a CR2477N battery. The battery is not in it. Is it necessary to add a battery to the instrument? Or is the battery just related to some extension that the instrument does not have? Thank you for any help and answer!
Siglent SDS804X HD questions - Auto and Date/Time - Page 1
Forum section: electronics / testgear

author: jsantoro
author_rank: Regular Contributor
timestamp: July 01, 2024, 05:02:39 pm
content: Hi, Just purchased this as my Tek is getting a bit long in the tooth. 2 questions: How do I get it to save the date and time? It reverts back to 1/1/1970 after you try to set it. And how do I get rid of this extra dialog box when I hit the Auto Setup button. I just want to hit the button once.Very annoying.

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 01, 2024, 05:21:33 pm
content: There's a thread specifically for the device where these questions have been answered. You can try hitting the button a second time to bypass the confirmation box.

author: jsantoro
author_rank: Regular Contributor
timestamp: July 01, 2024, 05:33:10 pm
content: Thanks, I'll ask over there. I don't want to se the box at all. I knew I hit the button, once should be sufficient.

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 01, 2024, 05:55:45 pm
content: Quote from: jsantoro on July 01, 2024, 05:33:10 pmI agree, but it's not an option. Hit the physical button twice is the easiest way.
Having a Fluke 5560A Calibrator would be like... - Page 1
Forum section: electronics / testgear

author: PushUp
author_rank: Regular Contributor
timestamp: July 01, 2024, 02:11:22 pm
content: Having a Fluke 5560A Calibrator would be like......being in an empty museum? ...coming a dream come true?! ...or is there anything better...?As I don't need a calibration certificate, but proper adjusted DMMs, I guess, that I need not have the chance to get access to such an instrument, because it would be like a rat having the brain connected with a pleasure button, pressing it over and over till the end...or at least, till all my devices are adjusted. Ha ha ha...As the "cheap" Fluke DMM such as the 17B MAX, for example, only has 6 testpoints inside the housing, I wonder, if anybody knows, how this adapter may look like? Maybe a special housing, so that you also have the 3Volt for the device under test itself or nothing fancy and just with an external 3V battery connected like the manual shows? At least you only need a Fluke 5522A to adjust it:It is nice, that Fluke does lift the curtain a bit:https://www.youtube.com/@FlukeCalibration/videos...as I would love to see more of such things, because the "normal" youtuber probably gets some presents, but most likely not a demo of a 5560A or...maybe... "The Signal Path" or our beloved host, with the chance of taking it apart??? Mmmmhh...don't know, but I believe, he is capable of doing so!Cheers!
National Instruments VXIPC-486 Model 500 Software - Page 1
Forum section: electronics / testgear

author: ZGoode
author_rank: Frequent Contributor
timestamp: July 01, 2024, 06:12:04 am
content: Hi All,I'm looking for the most recent version of the NI software compatible with my VXIPC-486 system running MS-DOS. Checking their website I only see NI-VXI version 3.8 as the oldest version available, but it doesn't list support for MS-DOS. Same goes for the NI-488.2 drivers and LabWindows. Anyone have or know where I might find either all these software or a MS-DOS install image specifically for the VXIPC that already has them included?
Defective SSA3021X Plus - Page 1
Forum section: electronics / testgear

author: RandyS
author_rank: Newbie
timestamp: June 30, 2024, 02:37:02 pm
content: I have a SSA3021X Plus that was purchased new in January of 2023. I've not used it more than a few hours.When powering up, the display is all white, switches to black, then back to white again. After a few more seconds, the intensity slowly starts decreasing and it ends up looking like this.Has anyone else seen this? Suggestions as to where to start troubleshooting? Are the service type manuals available?Thanks!!

author: coromonadalix
author_rank: Super Contributor
timestamp: June 30, 2024, 04:18:09 pm
content: send a mail to Tautech member here ...

author: RandyS
author_rank: Newbie
timestamp: June 30, 2024, 04:35:56 pm
content: Thanks! Will do.Randy

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 30, 2024, 06:30:14 pm
content: Assuming you didn't buy it on clearance, it should have a 3 year warranty. Contact Siglent NA for support if tautech doesn't have an easy fix.

author: tautech
author_rank: Super Contributor
timestamp: June 30, 2024, 08:33:31 pm
content: Quote from: RandyS on June 30, 2024, 02:37:02 pmhttps://siglentna.com/service-and-support/

author: Martin72
author_rank: Super Contributor
timestamp: June 30, 2024, 08:36:14 pm
content: Quote from: RandyS on June 30, 2024, 02:37:02 pmThis looks like a hardware defect, apart from sending it in there won't be much you can do.
Who makes multimeters for Ideal these days? - Page 1
Forum section: electronics / testgear

author: hkhnm
author_rank: Newbie
timestamp: June 29, 2024, 10:54:52 am
content: It looks a little bit like a Brymen?https://www.lowes.com/pd/IDEAL-ID-1000-Volt-Auto-Range-Multimeter/5000045537

author: J-R
author_rank: Super Contributor
timestamp: June 29, 2024, 08:40:01 pm
content: Made in China, so not Brymen or UEi. Maybe Uni-T.

author: hkhnm
author_rank: Newbie
timestamp: June 30, 2024, 08:07:06 pm
content: The Cat IV UL Listing doesn't sound like Uni-T, I think the most they do is CE self certification.I know it says made in China but are there any other manufacturers that use that physical layout?
How can YR1035 be not affected by the inductance of the DUT? - Page 1
Forum section: electronics / testgear

author: shapirus
author_rank: Super Contributor
timestamp: June 29, 2024, 06:20:13 pm
content: I have noticed several times that the YR1035 milliohmmeter (which uses a 1 kHz testing signal) displays the actual DC resistance of the conductor under test, which is seemingly not affected by its inductance, which I would expect to manifest itself as an increased value of the displayed resistance with the added part calculated as2πfL.I have never taken the time to properly verify it until now. This time I measured the center conductor of a 10 m (or rather about 9.8 m actual) long piece of coax cable:1. L = 18 µH (measured by ST42 tweezers)2. Rdc = 0.354 Ω (measured by passing a known DC current and measuring the voltage drop across the wire)The YR1035 shows 0.355 Ω. No apparent effect of the inductive reactance, which should be about 0.1 Ω at 1 kHz, so the expected reading would be about 0.45 Ω (Rdc + 2πfL).I have checked the signal across the conductor under test with an oscilloscope. There's lots of background EMI noise, but a 1 kHz wave can actually be seen.So... What am I missing? How can it display the actual DC resistance even when the measured conductor's inductance is high enough that it can't be ignored?p.s. ST42 also displays ~350 mΩ regardless of the frequency of the test signal (from 100 Hz to 10 kHz). I guess I'm missing understanding of some fundamental effects here!

author: Kleinstein
author_rank: Super Contributor
timestamp: June 29, 2024, 06:26:58 pm
content: There are several ways to suppress the effect of DUT inductance. One is using some square wave and wait a little after the edges. The transition can be relatively fast, as long as the inductance is one small, like in the example.Another method is measuring the current and voltage in vector voltmeter style (e.g. digitizing and math) and this may get both the resistance and inductance part separate, just like LCR meters do it.

author: shapirus
author_rank: Super Contributor
timestamp: June 29, 2024, 06:30:06 pm
content: Quote from: Kleinstein on June 29, 2024, 06:26:58 pmInteresting. I will repeat the test later with some larger inductances. Anything larger that I have is wound on cores, though, but I guess that's actually good in this case.
HP 34401A - DIAGnostic:TEMPerature? - Page 1
Forum section: electronics / testgear

author: mendip_discovery
author_rank: Super Contributor
timestamp: June 30, 2024, 04:54:10 pm
content: The other day I decided to use the info from,https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg4631059/#msg4631059to upgrade my 34401A (10-5-2) with 10mA on AC, TEMP Menu, Min:Max - sdev and pp, scale/calc:scale, custom aperture NLPC and save and recall states.Not sure how much I will use them at the moment but time will tell.One thing I mentioned was DIAGnostic:TEMPerature?, I tried it and got "+4.73000000E+01". Would I be right in guessing that is from the 23C nominal so 27.73C
Looking for Documentation on Tektronix Training Board 3 (aka TB3) - Page 1
Forum section: electronics / testgear

author: calibrationfixture
author_rank: Regular Contributor
timestamp: June 29, 2024, 04:37:10 am
content: Hi,Contrary to the Training Board 2, for which an Instruction Manual (071-1137-00, 26 pages) can be downloaded, Documentation on this Board is scarce as hen's teeth. I contacted Tektronix about it and they could only find a 1 Page Document (see below). A picture of this TB3 is on page 152 of the very informative Application Note 48W-26279-3: MSO5000/DPO5000 Series Lab Excercise Book (2012). Anybody having more then these slivers/crumbs?Calibrationfixture
Fluke 8842A multimeter stuck in remote mode - Page 1
Forum section: electronics / testgear

author: raymond008
author_rank: Contributor
timestamp: May 09, 2024, 01:27:32 am
content: Hi,I recently got a fluke 8842A bench top multimeter.Somehow, it get stuck in 'Remote' mode with no other digital display.Does it means it failed to power up reset or it is actually locked to 'Remote' operation only?Any hint?Thanks.

author: J-R
author_rank: Super Contributor
timestamp: May 09, 2024, 01:42:58 am
content: Does the unit have a GPIB interface installed? You could try removing it as a test.Local button does nothing?What happens if you try the full self-test?

author: raymond008
author_rank: Contributor
timestamp: June 28, 2024, 01:18:12 pm
content: There is no GBIP on this unit.It turns out the -30v is dead. After replacing VR605 (7924 voltage regulator), the multimeter boot up 'properly'.Now I facing a few other issues.There seems to be more power related issue. If I plug back the AC RMS module plugin, the display flickering.Then I found out the 2 input relays (K301, K401) are gone ... Here I stuck with another problem.The multimeter boot up but stuck with all lights on. If I touch any button, it get to '0' (standby?).All button seems to do the right thing, changing mode, changing samping rate etc ...But the sampling rate light (S, M or F) stay steady, not blinking at the rate of sampling.Does it means there is no sampling signal?I connect the front lead to voltage source and nothing change. The display still show '0'.I replace K301 and K401 with a normal mini 5V relay but nothing change.Now I need to trace the circuit to see how the sampling circuit works ...Any advice will be welcome.

author: raymond008
author_rank: Contributor
timestamp: June 28, 2024, 05:48:45 pm
content: How do I trigger a full self-test?

author: J-R
author_rank: Super Contributor
timestamp: June 28, 2024, 10:17:26 pm
content: Start reading at section 6-36 of the manual. There is a ton of good troubleshooting information.https://dam-assets.fluke.com/s3fs-public/8842a___imeng0300.pdf

author: raymond008
author_rank: Contributor
timestamp: June 29, 2024, 03:47:17 am
content: Thanks for the pointer. Looks like chapter 6 is a good starting point.It mentioned about power supply multiple times.I went back and check all supplies. 2 of them still out of spec.7.5v mesasured as 4.2, -8.2v measured as -3.2. Definitely not right.However, it's not zero. So, it's not a short on filter cap. I desolderedCR613 and CR614 zener for that 2 voltages, they measured fine.Now need to trace to the sink side to see what load them down.One of them connect to the fluke custom analog switch. Need to find the pin out of them ...

author: raymond008
author_rank: Contributor
timestamp: June 29, 2024, 03:51:19 am
content: I push SQR button to start self-test.It stuck at 06 ...
Is the hantek 6074BC a decent buy? - Page 1
Forum section: electronics / testgear

author: SIBtronics
author_rank: Contributor
timestamp: April 14, 2024, 12:45:03 pm
content: Am looking for my first oscilloscope, i want a usb one, since its portable while also giving me a decent size screen (thats why scopemeters are out) after looking at some options, both cheaper and expensive, i have found the hantek 6074BC (dont really care about the awg, the awg version is either 100 bucks more or from some sketchy seller either, and also dont need the car diagnose stuff of the BE). The other options are the owon vds 1022 or owon vds 6202 which seem rather limiting, even though the specs they claim are what i appear to get. i want to buy once, not buy once and realize its too limited later. the 70mhz quad Channel bandwidth and 250mhz! bandwidth sounds like it does that, anyone have any opinion on this scope? or something in a similar price range thats better

author: SIBtronics
author_rank: Contributor
timestamp: June 28, 2024, 06:22:58 pm
content: little Update: just bought the vds 1022i, after some thinking that is easily sufficient of what id need a scope for, atleast one can trust owon. have already got it it is awesome and everything i need.
Siglent Bundle Sale Logistics - Page 1
Forum section: electronics / testgear

author: 3d25
author_rank: Newbie
timestamp: June 29, 2024, 07:51:26 pm
content: Thanks to valuable information on this forum, I had been planning to buy an SDS2204X HD, sweetened by the SDS2XHD-BND sale which is slated to end tomorrow on 6/30.My plans for use of this are weeks in the future so I was wasn't in a hurry to order it and just wanted to do it before that deadline.Trying to do that today, I was expecting to be able to add the scope and bundle in a cart and order, but I find e.g. on tequipment.net it's "Please reach out to our customer service team to receive a quote to take advantage of this opportunity.", and alas they're closed on the weekends. On Siglent's site the scope and bundle are listed as out of stock, so no way to order it from them either.Can any e.g. sales reps familiar with Siglent give me an expectation of if I should be able to order the scope now and be able to "talk to a sales rep" on Monday and still be able to receive the bundle sale?

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 29, 2024, 08:22:47 pm
content: They appear to be out of stock. Saelig and Siglent both say 8 weeks.

author: 3d25
author_rank: Newbie
timestamp: June 29, 2024, 08:29:26 pm
content: Quote from: KungFuJosh on June 29, 2024, 08:22:47 pmOut of stock would be a bummer but bigger issue is I want to get the bundle sale before it expires.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 29, 2024, 08:35:10 pm
content: Quote from: 3d25 on June 29, 2024, 08:29:26 pmTry calling Saelig. You can probably get the order in and get the bundle. Or call Siglent NA sales dept and get an order in with the bundle. Personally, I don't like Tequipment, but some people do like them.Whoever you call, remind them that bundle sale is supposed to be good through the 30th. They all seem to have removed the bundle promo from their sites.

author: 3d25
author_rank: Newbie
timestamp: June 29, 2024, 08:47:51 pm
content: QuoteThey're closed on the weekends as well.I can call whichever place on Monday but am concerned how strict the 6/30 deadline is when they've aligned the sale to end on a Sunday, and you apparently can't execute the purchase without talking to someone (and these places are closed on weekends).

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 29, 2024, 09:53:48 pm
content: I'd put an email in to all of them and tell them you've been trying to order the scope with the bundle, but it wasn't available on their sites, and you weren't able to call them since they're not open on the weekend.If you don't already have them, you should also inquire on this site for discount codes, I know Saelig has a code, Tequipment might also.

author: 3d25
author_rank: Newbie
timestamp: June 29, 2024, 10:11:41 pm
content: Yeah, looks like the best plan is I'll order it this weekend and presume I'll be able to get the sale bundle added post hoc.Thanks for the heads up about a discount code, I didn't know about that.
Siglent SDS1104X-E Printing Waveforms - Page 1
Forum section: electronics / testgear

author: vbphil
author_rank: Newbie
timestamp: June 28, 2024, 04:02:00 pm
content: I can capture a waveform from this scope by various methods; EasyScopeX, Save it to USB as PNG, or via the scope's IP address using Browser.But, all the captures show the display with the Black background. This is crazy when printing and the black ink that's wasted.Is there a way to get waveforms on a white background suitable for printing?BTW, I've tried running the SigScopeLab program thinking maybe it has a way, but I can't get it to connect to the scope.Thanks, -phil

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 28, 2024, 04:15:12 pm
content: I've never tried this myself, but perhaps invert the image in a photo editor application?

author: hpw
author_rank: Frequent Contributor
timestamp: June 28, 2024, 05:08:00 pm
content: Quote from: vbphil on June 28, 2024, 04:02:00 pmSiglent needs to generally rethink about this black & inverted screen print.If inverted the background gets white. But the other graphs and text also inverted mades the WISIWIG to a nightmare and at the end you get lost into the dark guessing what channels & text colors where used.so the simple as it gets on inverted:1. Do not change any colors of graphs (sample & FFT & text)2. simple background as white.3. the x/y text colors should have its own configurable colors. Or simple, as the related channel colors. (currently dimmed or a bit darker)IMHO Siglent should rethink on that matter.my 2 centsHp

author: vbphil
author_rank: Newbie
timestamp: June 28, 2024, 05:21:02 pm
content: ok, I just figured it out.You can set up saving images thru the Save/Recall button on the scope's front panel.Select Save/Recall ButtonSelect the Save menu buttonSelect Type and set the file type, like JPGSelect the Screen Menu button and choose Invert GratPress the Save Menu ButtonSelect the Folder location on the USB or create a new FolderPress the Return Menu buttonThat's it. Now when the Print button is pressed it will save an image to the USB Flash Drive with those settings.I did all this with a USB flash drive installed. BTW, it has to be in FAT format.
BM235 Faulty/variable DC voltage readings - Page 1
Forum section: electronics / testgear

author: ClifS
author_rank: Newbie
timestamp: June 27, 2024, 04:52:26 pm
content: I have been using this BM235 since 2018, and for my use it has been more than adequate.I turned it on a couple of days ago and nothing. Checking the batteries, I found they needed to be replaced. There had been some minor leakage, but it didn't go anywhere other than the battery contacts, which I cleaned with electronic cleaner solution and a bit of rubbing(nothing extreme).When I put in the new batteries and set the meter to DC voltage(auto) it showed 1.5 volts or so, slowly counting down. When I installed the probes and shorted them together the voltage dropped about .05 volts, once again slowly loosing voltage. When I disconnected the probes, the voltage rose back to where it was originally, and slowly counting down.I cleaned the battery contacts again and also rubbed a pencil eraser on the pcb battery contacts. Putting the unit back together and inserting the batteries, I get the same response but the initial voltage is about .5 to .6 dc and counting down. Response to shorting the probes is the same, about .05 v dc down and slowly counting down. Disconnect the probes and the voltage goes back up to the original voltage, slowly counting down.Of course DC mV are doing the same thing, but all other features are normal.All of this appears to be some sort of slow capacitance discharge, but I'm stumped.Any and all suggestions would be greatly appreciated.Clif

author: J-R
author_rank: Super Contributor
timestamp: June 27, 2024, 10:23:11 pm
content: Is it possible that the batteries or the cleaning solution may have leaked a little onto the PCB? Maybe pull it apart and inspect everything under magnification.

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 27, 2024, 11:10:07 pm
content: Visible or not, your symptoms are typical of a contaminated PCB.In your case I'd disassemble fully and scrub the PCB in warm water with a toothbrush.

author: ClifS
author_rank: Newbie
timestamp: June 28, 2024, 01:47:47 pm
content: Thanks for the response guys. The tear down begins this morning. Setting up the microscope.Any other suggestions folks?Clif