hybridfree/eevblog-posts huggingface dataset:
EEVBlog BM786 arrived and made the video but started to talk about myself - Page 1
Forum section: electronics / testgear

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 15, 2021, 07:26:42 pm
content: The first video end up talking about myself how I started to get into Electronics and Computers, and how it was in Japan.Planning BM786 comparison video next, but not sure when I will upload it at the moment.

author: bc888
author_rank: Regular Contributor
timestamp: January 16, 2021, 04:17:50 am
content: What a wonderful video. Thank you so much for sharing it with us.

author: rs20
author_rank: Super Contributor
timestamp: January 16, 2021, 06:00:26 am
content: I'm not surprised you feel tired sometimes, the great work you do on the oscilloscope spreadsheet would be enough to tire many!

author: joeqsmith
author_rank: Super Contributor
timestamp: January 16, 2021, 04:22:24 pm
content: I enjoyed your historical video. In the early days, I would typically lay the iron on the table where it would roll when I bumped the cord. Soldering irons have damaged more papers, books, plastic parts, hands and legs than I can remember.Your collection is growing. Did you tire of the poor contrast of the Yokagawa and sell it? What did your wife get out of this deal?

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 17, 2021, 02:12:13 pm
content: Thank you for all the kind comments.My wife was trying to force me to read Konmari books, managed to escape from it.She gave me a permission to but new multimters for expecting for having 50,000 views on youtube, so I may having more issue than reading Konmari books...
Siglent Tech Support? - Page 1
Forum section: electronics / testgear

author: tony3d
author_rank: Frequent Contributor
timestamp: January 17, 2021, 04:48:00 am
content: Thinking about buying a new Siglent SDS 1104X-E. Just wondering if they have Phone Tech support?

author: tautech
author_rank: Super Contributor
timestamp: January 17, 2021, 04:53:45 am
content: https://siglentna.com/contact-us/
KeySight Infiniivision 3000T NAND Corruption - Page 1
Forum section: electronics / testgear

author: wp_wp
author_rank: Regular Contributor
timestamp: January 17, 2021, 04:47:29 am
content: My friend has a KeySight Infiniivision MSOX3102T scope.He hasn't used it for a long time.The scope has some thing wrong now.It does not display anything after power on.It has NAND corruption problem.When I use 3000XSeriesT.04.05.2015021000.ksx to make files to repaire it,I found the nk.bin.comp file can not be decompressed.But the recover.nk.bin.comp fike can be decompressed.I think that maybe I need 3000XSeriesT.04.00.2014101304.cab to make a set of files to repaired the scope.If you have the file,can you send it to me?Thank you.
Tektronix TDS784A Very Low Frequency Acquisitions (<1 Hz) - Page 1
Forum section: electronics / testgear

author: TonyBarr
author_rank: Contributor
timestamp: January 16, 2021, 08:48:41 pm
content: Hello, I would like to make real time data acquisitions of low frequency waveforms on my Tek TDS 784A DSO. For an example, a 0.2 Hz sine wave. It would be nice to have at least 2 complete waveforms on the screen at a time. To accomplish this, I set the record length at 500 pts per 10 divisions and time base at 1 second per division (50 pts/sec). With these settings, the scope updates about every 10 seconds when triggering off of the 0.2 Hz waveform. I tried triggering off a higher frequency square wave on another channel, but the update time did not change. I know this is possible with other scopes. Is the TDS784A capable of real time low frequency waveform display? Is there a problem with my scope? Please help!Thank you,Tony
Are these Chinese ethernet/coax testers any good? - Page 1
Forum section: electronics / testgear

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 15, 2021, 09:40:24 pm
content: https://www.aliexpress.com/item/2044442346.htmlI can't imagine the coax portion would be useful here in the USA as cable-tv is RG6/RG59 75 ohms.I couldn't see a combined ethernet+RG6 tester on AliExpress. Just ethernet+bnc.

author: CJay
author_rank: Super Contributor
timestamp: January 15, 2021, 09:47:44 pm
content: It's not going to measure cable impedance, it's just a basic continuity tester so it'll work just fine on 75, 93, 25 or whatever impedance coax as long as you stick a terminator resistor across the end of the cable.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 15, 2021, 10:41:06 pm
content: In the listing there is an image where it's showing impedance.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 16, 2021, 01:56:02 am
content: It's not intended for CATV etc. It's meant for networking.Here's the manual (with different branding):https://sgcdn.startech.com/005329/media/sets/REMOTETEST_Manual/REMOTETEST.pdf

author: CJay
author_rank: Super Contributor
timestamp: January 16, 2021, 08:43:42 am
content: Quote from: dorkshoei on January 15, 2021, 10:41:06 pmNo, there isn't, there's an image where it shows you it can tell if there's a terminator attached.It's measuring terminator impedance (and probably only well enough to tell if it's got one or two terminators attached) not cable impedance.

author: radiolistener
author_rank: Super Contributor
timestamp: January 16, 2021, 10:00:22 am
content: Quote from: dorkshoei on January 15, 2021, 10:41:06 pmThis is not displayThis is just a sticker with label near led.

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: January 16, 2021, 07:29:58 pm
content: Going off beam a little, I got one of these for testing my PoE Ethernet, and it seems to work OK for the price.https://www.aliexpress.com/item/1005001737031111.htmlCan't comment on coax as my only piece of coax runs up to the roof where I can't get at it anyway.
Mastech MS8040 Bench/Portable DMM Display Lighting Issues - Page 1
Forum section: electronics / testgear

author: cos
author_rank: Contributor
timestamp: January 16, 2021, 05:00:38 pm
content: I have read several entries on how to keep the MS8040 display lighting on while on mains power and even designed my own mod to accomplish that.After having used it on mains power for approx. half a year (incidently), display brightness had decreased significantly.Investigation shows that the design of the MS8040 display lighting circuit appears to overload the LEDs used, aging them rapidly resulting in reduced brightness (and unnecessary high drain from batteries when activated). Continuous use while on mains power significantly accellerates this aging because dissipation is increased.I devised a fix for this problem.See posting "Re:Part 2: Teardown/Evaluation Mastech MS8040 Bench DMM" my replies #17 dated March 20, 2020 and #18 dated January 16, 2021.
DS213 customized firmware with Roll Mode support. - Page 1
Forum section: electronics / testgear

author: spadger
author_rank: Contributor
timestamp: November 27, 2020, 04:41:55 am
content: Based on the official app firmware v1.27, and fixed some bugs. This is the test video:https://youtu.be/iGE-QNMqRk0Tips: What is Roll Mode?https://www.sweetwater.com/insync/roll-mode/On an oscilloscope, roll mode is a method of displaying acquired waveform data without waiting for the complete waveform record. For example, if a sweep was 10 divisions long with a rate of one second per division, and roll mode wasn’t available, it would take 10 seconds to fill the waveform record. But using roll mode, the oscilloscope will immediately begin displaying results rather than waiting the full 10 seconds.

author: bobdavejimerson_iv
author_rank: Newbie
timestamp: January 03, 2021, 09:51:06 pm
content: This is great! Thank you.

author: spadger
author_rank: Contributor
timestamp: January 15, 2021, 01:19:11 am
content: The project is now open source on github.https://github.com/xjtuecho/DS213_ECHO.git
Is there a BW hack for a TDS3034C - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: January 14, 2021, 07:56:14 pm
content: Is there a BW hack for a TDS3034C? My TDS3034 is now a TDS3054. Is it possible to hack a "C" series Tek TDS3000 series scope?
B&K Precision model 3025 For Sale on Craigslist - Should I Buy? - Page 1
Forum section: electronics / testgear

author: tomthepom
author_rank: Newbie
timestamp: January 14, 2021, 06:16:11 am
content: I'm trying to put together an electronics lab for myself, and found a B&K Precision model 3025 sweep/function generator listed for $75 on my local craigslist.Seems to be in good condition, and the seller has pics of the waveforms up on their scope + says they can demonstrate that it's fully functional (apparently they upgraded to a new function generator).Is it a good deal, or would I be better off buying something new?

author: Berni
author_rank: Super Contributor
timestamp: January 14, 2021, 06:34:22 am
content: Yep it is a pretty capable signal generator, even if it does look rather old.It all depends on what your needs are. But in general for most electronics work you don't need fancy high end equipment as long as you got something. Start off with something old and cheep then see if you end up outgrowing it and needing something better. At that point you are much better informed on exactly what specs you want to spend the big bucks on for a shiny high performance model.I still keep around a old analog twiddly knob HP pulse generator despite having proper digital signal generators. Sometimes the simple old analog thing is all i need.
Signal offset increases as volt/div decreases and signal changes with offset - Page 1
Forum section: electronics / testgear

author: muawiya
author_rank: Newbie
timestamp: January 11, 2021, 06:26:08 pm
content: Hello,This is on a Lecroy 64XI-A scope, though I've had this happen on some tek scopes as well.I am probing the same signal and only changing the volt/div & noticed that when I decreased the volt/div that the signal offset would increase. Can't think of an explanation and was wondering if someone can explain this (see first 2 attachments)I also can't explain the last 2 attachments where changing the offset (-800mv to -1.58V) changed what the scope was plotting.

author: srb1954
author_rank: Super Contributor
timestamp: January 11, 2021, 08:59:43 pm
content: It looks like you are grossly overloading the scope amplifiers when you decrease the scale factor such that the waveform considerably exceeds the screen height.This overloading would cause the internal stages of the the amplifiers to clip possibly changing normal bias conditions and causing apparent signal offsets.

author: TimFox
author_rank: Super Contributor
timestamp: January 11, 2021, 09:06:35 pm
content: Traditional oscilloscopes have a "balance" pot on each input (typically a screwdriver adjust for modern units). If the balance is not correct, then even without a signal applied the offset will change as you change the V/div switch. The adjustment procedure is simple: just adjust the pot until the offset remains constant as you run the V/div switch through its range. Does your unit have visible "balance" pots? They would affect the amplifiers ahead of the digitization.

author: muawiya
author_rank: Newbie
timestamp: January 11, 2021, 09:47:06 pm
content: Not seeing a balance pot but applying a signal and going through the ranges, everything checks out

author: muawiya
author_rank: Newbie
timestamp: January 11, 2021, 09:54:43 pm
content: In the attachments I am probing a signal that toggles from 80V to 0V @ 2MHz, I replicated the scenario with a power supply and am unable to replicate the same behavior, well I can't toggle the power supply at 2MHz.I applied 80V at 1V/div and I can bring down the offset to -79V and the signal appears at the right place, I also toggled the supply low and captured the falling edge the behavior is correct (no apparent offset), repeated with 5V/div as well and it appears correct as well.

author: muawiya
author_rank: Newbie
timestamp: January 13, 2021, 06:42:21 pm
content: The comment about overloading the scope explains what happened.I replicated the scenario with a signal toggling between 40V & 0V and didn't see any distortion, toggling between 80V & 0V repeats what I attached.On the Lecroy 64XI-A scope at 0 offset the max trigger level is 4.1V and min trigger level is -4.1V, as the offset is decreased by x amount from 0, the max/min trigger level both increase by x amount and at a higher max trigger level the scope is able to be overloaded more and explains why the signal shows up when the offset is brought down.
SPD3303X-E hissing when outputs are on - Page 1
Forum section: electronics / testgear

author: ElectronicsHobbyist
author_rank: Contributor
timestamp: January 13, 2021, 10:09:10 am
content: Hi GuysI recently recieved my SPD3303X-E and hacked it right away to mV and mA resolution. After powering it up i noticed a hissing sound as soon as i turned one or more of the channels on. Because i hate noise i opened up the case and started looking for the culprit. I was looking for some kind of power inductor which could cause the hissing. There was nothing like this on the board so i looked for other components and saw the beeper. I was really surprised that the hissing stopped as soon as i placed my finger on the beeper. The fix was to take some tape and stick it on there. Now it works like a charm.Has anyone else experienced similar behavior with his power supply?

author: jrgandara
author_rank: Contributor
timestamp: January 13, 2021, 02:32:25 pm
content: Interesting! My PS was generating a kind of hiss latelly. But now it is not been working long enough to check that. If I manage to fix the PS I will check the buzzer.Thank you for this tip.JR
MSOX2014A Firmware Problem - Page 1
Forum section: electronics / testgear

author: zqcao
author_rank: Newbie
timestamp: January 13, 2021, 02:19:32 pm
content: I have an MSOX2014A oscillosible its firmware has some problems I followed the method of this tutorial to fix when I did the last step found that can not continue I suspect is the firmware version too new problem so I would like to ask for help I hope that well-wishers can upload the old firmware to the website or send it to my mailbox zqcao@ieoo.top thank youhttps://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/msg2136181/#msg2136181
Scope purchase: Rigol DS2202A vs Siglent SDS2202X-E  - Page 1
Forum section: electronics / testgear

author: mitchjstein
author_rank: Newbie
timestamp: January 18, 2021, 09:53:32 pm
content: Seeking the boards wisdom,I am in the market for a mid priced DSO.I believe that the 2 titled scopes fit the bill the specs line up just about the same although the Siglent is ~ $60 more expensive.I do not believe that I would ever use the extra options available for the Siglent.So the question is which scope and why?Thanks in advance,Mitch

author: Martin72
author_rank: Super Contributor
timestamp: January 18, 2021, 10:56:27 pm
content: Hi,I´ve owned the DS2072, without "A".I would go for the DS2202A when bigger, "nicer" display and the 50Ohms inputs are benefits to you.It got a good building quality also, as the DS2000A series are a little bit older, but they were in the pricerange of the actual MSO5000 series (afaik the DS2202A costs about 2000 bucks or more as they launched this series).

author: tautech
author_rank: Super Contributor
timestamp: January 19, 2021, 04:51:57 am
content: Quote from: mitchjstein on January 18, 2021, 09:53:32 pmSDS2202X-E while only the 200 MHz model is built around a 350 MHz platform.The option list is quite small: 16ch MSO, 25 MHz AWG (both external modules) and WiFi capability should it be needed.List price $ 619Additional features that may or not interest you are:1 Mpts FFTBode Plot50 Ohm inputsFree decodesSearchDatasheethttps://siglentna.com/wp-content/uploads/dlm_uploads/2020/02/SDS2000X-E_DataSheet_DS0102E-E02A.pdf
Need real service manual for the Siglent SPD3303X  - Page 1
Forum section: electronics / testgear

author: jrgandara
author_rank: Contributor
timestamp: January 13, 2021, 03:45:18 am
content: Hello guys!I'm in trouble with my Siglent SPD3303X Power Supply. It will be off and on all the time. I got a"servcie manual" but this is not really a servcie manual, since there is only voltages to check and no schematics for service.Anyone have a copy of the real service manual for this product?Thank you!Siglent SPD3303X
Anritsu Autocal software - Page 1
Forum section: electronics / testgear

author: Aiy
author_rank: Regular Contributor
timestamp: January 12, 2021, 07:25:29 pm
content: Hello Everyone,I'm scouting for an Anritsu Autocal module on eBay, but I'm concerned that the modules for sale lack the necessary control software which is referenced in the manual, i.e. "AutoCal program disk"https://dl.cdn-anritsu.com/en-us/test-measurement/files/Manuals/Users-Guide/10410-00199.pdfI'm assuming also that the software diskette originally shipped with the modules would have s2p files with characterization data for the Autocal module...The modules themselves uses a power supply and a RS232 interface to a controlling PC, in contrast to the Agilent ECal modules which connect to the VNA directly if memory serves.So far I have not found any online repository with these files, does anybody have them ?Best regardsAnyone

author: TheSteve
author_rank: Unknown
timestamp: January 12, 2021, 07:45:17 pm
content: I've not seen or used the software but I would expect the correction factors for each Autocal module to be stored internal the module - if not without the original parameters the module would be pretty useless.edit - I've been told the correction factors may not be stored in the modules - but that you can characterize them yourself if you have a known good cal kit with a sliding load etc.
HP/Agilent/Keysight 34401A and 34970A vacuum florescent display - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: January 11, 2021, 09:35:17 pm
content: I just got of the phone with technical support at Keysight for a different subject and the conversation ended up on the topic of the 34401A multimeter vacuum florescent display. He told me that the identical display is also used in the 34970A DAQ.It is good to know since there are Chinese replacements available for the 34401A

author: H.O
author_rank: Frequent Contributor
timestamp: January 12, 2021, 06:08:11 am
content: Not that I would generally second guess Keysight support but I don't think that's 100% accurate TBH.If you look at the two displays you can see that there are annunicators on each that aren't on the other (like "Rear", "Math" & Ratio on the 34401 display) and some of those that ARE on both are not always located in the same place, like "Error" for example.So I would look into that a bit more before buying a 34401a display for a 34970a or the other way around.

author: bdunham7
author_rank: Super Contributor
timestamp: January 12, 2021, 06:26:32 am
content: Quote from: H.O on January 12, 2021, 06:08:11 amAnd both are actually available new on eBay.https://www.ebay.com/itm/VFD-Display-Screen-for-Agilent-HP-Keysight-34970A/324150468683?hash=item4b78dfa04b:g:wA0AAOSwZ2ZeqcgXhttps://www.ebay.com/itm/NEW-Genuine-HP-AGILENT-34401A-Display-VFD-vacuum-Fluorescence-Display-free-ship/184604737646?hash=item2afb4cc06e:g:avkAAOSwIexeoA~K
Rigol DG1022Z calibration - Page 1
Forum section: electronics / testgear

author: pauledd
author_rank: Regular Contributor
timestamp: January 10, 2021, 05:46:59 pm
content: HiI just noticed my DG1022Z is a bit off in ARB mode when I select just DC output. It reads 1.2mV when it should be 0V.I wanted to take a look into the calibration menu but it is password protected and "12345" from other RIGOL product did not work.Does anyone know the factory password or do I need to contact RIGOL.

author: manupthehills
author_rank: Contributor
timestamp: January 10, 2021, 09:14:20 pm
content: The password is 123456You can calibrate all the "cal item" but don't touch the high frequency flatness 'cause there's a bug and it will screw the instrument. However, it can be recovered by loading the calibration default, but then you'll be back at square zero...

author: pauledd
author_rank: Regular Contributor
timestamp: January 11, 2021, 09:11:48 am
content: Thanks, works. I guess I only need to do the OFFSET items...I just found a calibration manual:https://www.rigolna.com/calibration/
PRS10 PPS and 10MHz - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: January 08, 2021, 08:35:17 pm
content: Ok, this is bugging the hell out of me....I tried to configure the PRS10 PPS and 10MHz so that the phase is kept in sync between the 2... but it is still jumping around, kind of 3 steps in a loop on my scope, PPS real steady then 10MHz moving a bit in 3 positions. If I do a Rise PPS+high 10MHz, the 10MHz stays in place and so is my 1.290GHz carrier, dead on, so I know my TDS694C is NOT bad ...I am now thinking to add a PPS output with a little of logic and keep the PPS start at the edge of a 10MHz period and let it go down 100µs later on another rising edge....Am I missing, some settings in the PRS10

author: DaJMasta
author_rank: Super Contributor
timestamp: January 08, 2021, 08:42:46 pm
content: If you take a look at the datasheet for the PRS10 you can see the architecture - the PPS output is computed by the processor to give output stability in the long term, it is not a divided down 10MHz output signal, so the OCXO driving the 10MHz output is effectively disciplined according to the PPS output signal, but it will never perfectly be in phase with it in the short term - it is designed to be perfectly in phase with the output for time constants approaching infinity.If you want a perfectly in phase PPS output from a 10MHz clock, you should just divide down the clock with some or a configurable divider chip, the architecture of the PRS10 will never guarantee you that in the short term.

author: tchiwam
author_rank: Regular Contributor
timestamp: January 08, 2021, 08:53:00 pm
content: Are they any good Rb clock with displined PPS and 10MHz that are in phase ? available at some reasonable cost that is ...PS: PRS10 new is still in the reasonable price bracket...

author: DaJMasta
author_rank: Super Contributor
timestamp: January 09, 2021, 05:16:58 am
content: Do you actually need 1PPS for your application or some other frequency? If your needed frequency is high enough, you just need to lock a PLL for your output frequency to the 10MHz output, if you actually want something as slow as PPS, you just need a divide by 10,000,000 circuit or frequency synthesizer that takes the 10MHz as a reference.I don't really know of one with an output where the PPS output is just a divided down output of the main OCXO, but I don't know the architecture of that many Rb oscillators - it's not hard to do, but I don't think most implementations bother because the short term phase drift on the PPS is going to be less than the GPS PPS doing the initial disciplining, so it's sort of clean enough.

author: tkamiya
author_rank: Super Contributor
timestamp: January 10, 2021, 03:47:03 pm
content: You could perhaps use this and generate pps from 10MHz output?https://tapr.org/product/tadd-2-mini-pulse-per-second-divider/It's open source, so you can even make your own.
Rohde&Schwarz RTO1012 ADCerror  - Page 1
Forum section: electronics / testgear

author: Wade2019
author_rank: Contributor
timestamp: January 10, 2021, 08:48:47 am
content: Hello everyoneI have a RTO-1012, unfortunately it the boot prompt GB Receiver" (gigabit receiver) error This causes 1 channel 2 channels to not workI try to open the oscilloscope to clean the ADC<->FPGA connectorUnfortunately The fault persistsIs there anyone to help meoscilloscope log：-> Running signal quality check! Error: not enough input power at Input_Ch_2, Lane#0! Error: not enough input power at Input_Ch_2, Lane#1! Error: not enough input power at Input_Ch_2, Lane#3! Error: not enough input power at Input_Ch_2, Lane#5! Error: not enough input power at Input_Ch_2, Lane#6! Error: not enough input power at Input_Ch_2, Lane#7! Error: not enough input power at Input_Ch_2, Lane#8! Error: not enough input power at Input_Ch_2, Lane#9! Error: not enough input power at Input_Ch_1, Lane#0! Error: not enough input power at Input_Ch_1, Lane#1VGA Gain: a low value stands for good signal quality,possible range 0 to 16(-6.02 dB to 10.6 dB),valid range 0 to 6(-6.02 dB to 0.205 dB).Input_Ch_2Lane #0: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #1: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #2: 0(-6.02 dB)Lane #3: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #4: 0(-6.02 dB)Lane #5: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #6: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #7: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #8: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #9: 15(9.54 dB) <<<<<<<<<<<<<<< !Input_Ch_1Lane #0: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #1: 15(9.54 dB) <<<<<<<<<<<<<<< !Lane #2: 4(-1.87 dB) <<<<Lane #3: 3(-2.91 dB) <<<Lane #4: 4(-1.87 dB) <<<<Lane #5: 3(-2.91 dB) <<<Lane #6: 4(-1.87 dB) <<<<Lane #7: 3(-2.91 dB) <<<Lane #8: 4(-1.87 dB) <<<<Lane #9: 5(-0.833 dB) <<<<<Signal quality check failed!-> Running DFE status checkError: DFE of Input_Ch_2, Lane #2, Eye-Width too smallError: DFE of Input_Ch_2, Lane #3, Eye-Width too smallError: DFE of Input_Ch_2, Lane #4, Eye-Width too smallError: DFE of Input_Ch_2, Lane #5, Eye-Width too smallError: DFE of Input_Ch_2, Lane #6, Eye-Width too smallError: DFE of Input_Ch_2, Lane #7, Eye-Width too smallError: DFE of Input_Ch_2, Lane #8, Eye-Width too smallError: DFE of Input_Ch_2, Lane #9, Eye-Width too smallError: DFE of Input_Ch_1, Lane #1, Eye-Width too smallDFE status check failed!

author: Wade2019
author_rank: Contributor
timestamp: January 10, 2021, 09:07:50 am
content: The thread ADC PicturesSorry jjoonathan used your picture without your consent
DickSmith D-3812 Power Supply Modifications? - Page 1
Forum section: electronics / testgear

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: August 03, 2014, 09:44:50 pm
content: So I picked up this power supply yesterday, not really sure why, but for $20, why not! Was still in the original box, hardly ever been used.After buying it, I realised its 13amp rating is only at maximum voltage, (15volts) because the transformer only has a single secondary winding, so the heatsink can't dissipate the heat generated at lower voltages.So, I'm considering adding a switchmode pre-regulator, Unless someone has a better idea?The other thing is, this power supply appears to have overload protection... it won't even power up with a 50 watt car headlight globe connected to it...I don't suppose anyone has a schematic for this PSU so I can have some idea of what I'm doing? It doesn't have adjustable current limiting either, but the higher voltage/lower amperage versions of the same PSU do...Looks like quite a bodge of a power supply, but the case is very solid!Thanks!

author: barjammar
author_rank: Contributor
timestamp: January 10, 2021, 12:40:23 am
content: HiDo you have any further information? I noticed I have this in my garage. I might run some tests on it.ThanksBarry

author: wilfred
author_rank: Super Contributor
timestamp: January 10, 2021, 01:47:34 am
content: This thread may contain something useful.https://www.eevblog.com/forum/repair/faulty-dse-d-3800-power-supply-similar-to-manson-ep-925/msg1199719/#msg1199719I attached a circuit DSE sent me of the Q-1760 which may be similar but with the current limiting. I hope it is somewhat useful.
hp 8590A spectrum analyzer  - looking for service manual  - Page 1
Forum section: electronics / testgear

author: psykok
author_rank: Frequent Contributor
timestamp: January 09, 2021, 02:15:20 pm
content: Hi,My 8590 working fine but needs a calibration.I'm looking for the service and/or calibration manual for this device.All the documentation I was able to find is only covering the L and C series not the 8590A which is maybe a earlier model.Does anybody have documentation for this device?Alex

author: Emo
author_rank: Regular Contributor
timestamp: January 09, 2021, 03:33:39 pm
content: Hi,This is the adjustment paragraph. I thought is was on Ko4BB but could not find it anymore at that site. I also do have a device manual and ROM images, however >5 MB so if interested I can sent it via dropbox or we-tranferEric

author: MarkL
author_rank: Unknown
timestamp: January 09, 2021, 04:57:58 pm
content: Documentation for the 8590A is still available on keysight.com. You can go there and search for "8590A", or try this link:https://www.keysight.com/en/pd-8590A%3Aepsg%3Apro-pn-8590A/portable-rf-spectrum-analyzer-10-khz-15-ghzYou can also purchase a professionally scanned version here:http://artekmanuals.com/manuals/hp-manuals/

author: psykok
author_rank: Frequent Contributor
timestamp: January 09, 2021, 07:20:48 pm
content: hi,thanks for the links, I don't why but I overlooked the keysight websitenow I need to source some adapters to perform the needed procedures.Alex
Opinions about  HP5361A - Page 1
Forum section: electronics / testgear

author: DC1MC
author_rank: Super Contributor
timestamp: January 09, 2021, 03:35:08 pm
content: Hi, I need a counter that goes over 1GHz, and I may be able to acquire a HP 5361A, foes anybody have an experience with this device, is it worth having as a counter, I see that it has a lot of communication features (measuring base frequency of FM modulated signal, tracking and so on...) and a lot of pulse mode measurements, but what about just being used as normal frequency meter ( I think HP calls it CW mode ) ?Most of the literature I find on the net is about 5361B, don't really realize what the big differences are.Any help or advice is appreciated.Cheers,DC1MC

author: 0culus
author_rank: Super Contributor
timestamp: January 09, 2021, 07:05:24 pm
content: How much over 1 GHz? Looks like this is at least a 20 GHz counter. I have a similar 5350B myself, at one limitation to note is that it has 1 Hz resolution only. Also the UI of these counters leaves a lot to be desired IMO. The LCD is hard to read and the button layout is confusing.

author: DC1MC
author_rank: Super Contributor
timestamp: January 09, 2021, 07:57:14 pm
content: Thanks for the info, the maximum frequency that I could generate and I want to measure is around 6GHz (actually 5.5GHz).I've seen that for the frequencies up to 10MHz, 5361 has a "High Resolution" setting, that somehow manages some extra digits.I also have some other HP, that goes up to 520Mhz only, that has a longer gate time, if I really need miliHz.If you know of some other better option under 500EUR (550USD), I will be more than happy to hear about it, the display and UI are of no consequence.Cheers,DC1MC
10811-80160 -80111 -80120 ... - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: January 08, 2021, 08:15:26 pm
content: Hello all,1st easy question, between all of the 10811- 80160 -80120 -80111 what is the better model ?10811-60109 Seems to be a great but non existent thing < 2.5 x 10-1210811-60111 No time stability specs < 1.0 x 10-11 1s10811-60120 The best characterized < 5.0 x 10-12 1s << My guess being this is the better available one ?10811-60158 Found 1 somewhere, no clue where it goes ... < 9.8 x 10-1310811-60160 cheaper 60111 ?10811-60260 improved aging 10811-60160They all have different phase noise too, some go down to -103@1Hz/162dBc@10kHzThese are rather confusing.... Wondering which one is the original Option 012 in a 53132 and option 010 53131/132/181...I guess the HP86##X option 001 is using the HP1813-1304(MC6811X4), which is a rebranded 10811-?? from that list.Continuing to read....
Is iTech IT7321 and BK9801 the same animal ? - Page 1
Forum section: electronics / testgear

author: DeanA
author_rank: Regular Contributor
timestamp: July 28, 2020, 05:53:38 am
content: Hi,We have one BK9801 AC power source and I'm quite happy with it,https://www.tequipment.net/BK/9801/AC-Power-Supplies/?v=0$3059AUD.I've now seen the iTech IT7321 and it looks very similar if not identicalhttps://www.tequipment.net/ITech/IT7321/AC-Power-Supplies/$2062AUDAnyone can tell me if it's exactly the same animal or just very similar? We could do with a another one for production testing so be good to save the $1000AUD.

author: wraper
author_rank: Unknown
timestamp: July 28, 2020, 05:59:19 am
content: Itech is owned by BK and makes BK electronic loads and other stuff. So if specs are the same, then you are buying the same.

author: delfinom
author_rank: Regular Contributor
timestamp: July 28, 2020, 02:42:42 pm
content: Quote from: wraper on July 28, 2020, 05:59:19 amYep. BK barely changes anything besides their color/themeing. Hell sometimes they just change the IT to a BK in the part number without changing the rest.Though some of the ITech units are slightly better than the BKs sometimes (revision controlled?). I have an ITech electronic load identical to the BK except the terminals are posts with a banana jack center unlike the post only BK.

author: Lena
author_rank: Newbie
timestamp: December 24, 2020, 08:54:34 am
content: ITECH produces some models of equipment for BK, but ITECH also develops and produces its own equipment and sells it under the ITECH brand, ITECH and BK are not the same company.

author: wraper
author_rank: Unknown
timestamp: December 24, 2020, 06:10:29 pm
content: Quote from: Lena on December 24, 2020, 08:54:34 amITECH is BK subsidiary, regardless of what you say. ITECH is not some independent business.https://www.mouser.jp/pdfDocs/bk_new_products_catalog_2015.pdfPage 12Quote

author: Lena
author_rank: Newbie
timestamp: January 07, 2021, 03:55:56 am
content: Quote from: wraper on December 24, 2020, 06:10:29 pm2015 data, you can update your information now

author: wraper
author_rank: Unknown
timestamp: January 07, 2021, 04:02:00 am
content: Quote from: Lena on January 07, 2021, 03:55:56 amUpdated based on your words with no details and zero confirmation?

author: ResistorRob
author_rank: Regular Contributor
timestamp: January 08, 2021, 04:12:09 am
content: I looked through my 5,000 page book which lists every animal known to man and I didn't see any mention of an AC power source. I am so confused!! Are they the same animal? I think a better question is are they even animals at all!!!Quote from: wraper on January 07, 2021, 04:02:00 amI have no dog in this fight (woof), but here is what I found..."B&K also owns subsidiaries Sefram, ITECH, and Lodestar."source:https://www.tequipment.net/bk/(last sentence in about section)

author: Elasia
author_rank: Frequent Contributor
timestamp: January 08, 2021, 01:30:51 pm
content: Did B&K sell them? Interestingly they are not listed in their 2020 new products... but look at all that siglent rebadginghttps://s3-us-west-1.amazonaws.com/bkpmedia/downloads/pdf/NPCat_v2_2020.pdf
Hantek DSO5072P come with 200MHz allready hacked???? - Page 1
Forum section: electronics / testgear

author: HackerMy
author_rank: Contributor
timestamp: January 07, 2021, 09:00:10 pm
content: Hi everyone!I just received a Hantek DSO5072P brand new with firmware for July 2020 , and i noticed that i am able to go to 2.00ns time period without doing any hack on it. Presently i have no way to test the max frequency, but is it possible that this unit come already enabled for 200MHz from the manufacturer? If someone recently bought one like that may wish to share more information about it....Thank You!
Function generator - "duty" control also changes frequency - Page 1
Forum section: electronics / testgear

author: injb
author_rank: Regular Contributor
timestamp: January 07, 2021, 01:42:36 am
content: I have this old Kenwood function generator (FG-273). As well as a frequency control, it has a control marked "duty". I thought this was a duty cycle control, but it's behaviour is a bit puzzling to me. It changes the on time of the signal when the generator is in square wave mode. But it changes the frequency too! If I turn the pulse length up, the frequency goes down.So I can kind of get the frequency and duty cycle I want by adjusting the duty control first, and then the frequency control, but it's very tedious this way.Is that typical or does it sound like something is wrong with it, or with the way I'm using it?

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 07, 2021, 02:18:47 am
content: That's the expected behavior. See page 8 ofhttp://physics-astronomy-manuals.wwu.edu/Kenwood%20%20FG-273A%20Function%20Generator%20Manual.pdf
VC99  - what does VR6 adjust - Page 1
Forum section: electronics / testgear

author: atunguyd
author_rank: Contributor
timestamp: January 08, 2021, 07:34:24 am
content: Hi wondering if anyone can help me. I had to replace a fuse in my Vc99 meter yesterday and when putting it back together I put a screw through the hole behind the VR6 pot. damaging that POT.Any long story short I now need to replace that pot. It is marked 502 so it looks like a 5k preset which is easy enough to get but I honestly dont know what I need to set it to (ie what does it calibrate). Would anyone know what measurement I need to be testing when I try set it to something reasonable? Or perhaps if someone has a schematic for this meter I can figure it out.Thanks in advance.

author: atunguyd
author_rank: Contributor
timestamp: January 09, 2021, 10:59:21 am
content: In case anyone is interested - turns out it is the temperature calibration. New 5k pot and calibrated at room temperature and 100 degrees C and it is good enough for me.
Siglent SDS-1102DL+ vs OWON SDS1102 - Page 1
Forum section: electronics / testgear

author: Roger_K
author_rank: Newbie
timestamp: January 06, 2021, 06:07:28 am
content: Hi folks,I want to get an entry level scope to mainly just attempt repairs on audio gear. AMPs (HiFI, valve guitar), AM/FM turners, maybe the odd CB radio here or there.I've been looking at the Siglent SDS-1102DL+ and OWON SDS1102 The Owon is about $40 cheaper, but I noticed the spec for sample rate for the Siglent was 500ms/s Sampling rate, Equivalent 50GS/s.The Owon has 1GS/s. So that seems to be double. Does that really matter?Also, Rise time for both seems around the <3.5ns mark.Which is the one to go for here? Are any of these hackable to get better rise time, bandwidth, or other feature.Thanks for you help.... look forward to some replies.Cheers Roger

author: tautech
author_rank: Super Contributor
timestamp: January 06, 2021, 06:19:14 am
content: Welcome to the forum.I'm sure the SDS1102DL+ are just fine however I've never seen the need to stock such lowly models with limited capability and instead have SDS1202X-E as our entry level DSO across the ditch in NZ.While these have a good bit more capability for a bit more dosh this is what I would recommend as it's more of a scope that will better suit your needs into the future as skills grow.However in this bracket of entry level DSO's the market is constantly changing and for just a little more the new SDS1104X-U is now available.Things you should have a good think about.

author: Roger_K
author_rank: Newbie
timestamp: January 06, 2021, 06:55:01 am
content: Thanks for your reply, seems the SIGLENT SDS1104X-U is about double what is on offer for the SDS1102DL+ $632 vs $299. At this time I don't want to drop that much coin on a scope.

author: tautech
author_rank: Super Contributor
timestamp: January 06, 2021, 07:25:58 am
content: Quote from: Roger_K on January 06, 2021, 06:55:01 amOK for that price they seem to be on special however just to be sure you should know there is no such model SDS1102DL+ instead it should be SDS1052DL+, a 50 MHz DSO with a minimal 32 KPts of memory that fully robs the strength of a DSO....captures and it's the primary reason we do not stock such models.Good luck with your hunt.

author: Roger_K
author_rank: Newbie
timestamp: January 06, 2021, 10:19:50 am
content: Not sure if I need glasses, but here is the SDS-1102DL+ 100Mhz, 2 channel.https://www.wavecom.com.au/product_view.php?id_product=1035Is the consensus that this scope is no good?

author: tautech
author_rank: Super Contributor
timestamp: January 06, 2021, 10:28:15 am
content: Quote from: Roger_K on January 06, 2021, 10:19:50 amAh OK, 1102DL+ is no longer available to the west and every official Siglent website only shows the 1052DL+ as available so it must be old stock.Not no good only a low spec DSO. They are still sold in China so bits will be available if needed for some time.

author: Roger_K
author_rank: Newbie
timestamp: January 07, 2021, 08:14:36 am
content: How about the Hantek DSO4102C? or the 70Mhz version?
MiniPro TL866II Universal Programmer: Adding new IC by user? - Page 1
Forum section: electronics / testgear

author: Greybeard
author_rank: Frequent Contributor
timestamp: January 03, 2021, 02:49:32 pm
content: Can anybody please explain, how to add new IC by user?Can you modify existing IC to change supply voltage or pin-out?Examples:Existing: 62256 (5V), wanted: 62LV256 (3.3V, max. 4.6V)Existing: AT29C256 (DIP28), wanted: AT29C256 (PLCC32)

author: BravoV
author_rank: Super Contributor
timestamp: January 03, 2021, 02:53:02 pm
content: No, I've asked the same question at the big Minipro thread, and the house expert on Minipro hacker, Radioman, said its not possible, as the IC programming method/algorithm is not at the PC'side, but incorporated "inside" the programmer firmware.

author: Greybeard
author_rank: Frequent Contributor
timestamp: January 03, 2021, 03:08:27 pm
content: What is the menu function "Adding new IC by user" made for?

author: Martin72
author_rank: Super Contributor
timestamp: January 03, 2021, 10:23:07 pm
content: I would also think that you can add new ICs by yourself, what the reading concerns.Apart from this, I like the testfunction of several (Logic-) ICs and it would be cool, if there will be an update for additional types of ICs.

author: macboy
author_rank: Super Contributor
timestamp: January 06, 2021, 08:50:03 pm
content: I would think this lets you add a new IC which is functionally compatible (voltage and pinout) to an existing one, but with maybe a different part number, and most importantly, a different device ID. That's just a guess though, I've never tried it.

author: eb4fbz
author_rank: Regular Contributor
timestamp: January 06, 2021, 10:53:13 pm
content: It's just for equivalents. You can't add new algorithms.
Fluke 8020B not measuring current - Page 1
Forum section: electronics / testgear

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 06, 2021, 03:58:26 pm
content: My Fluke 8020B has stopped measuring current. I've checked the fuse and it is okay. There's clearly a continuity problem somewhere because when I put the meter in the circuit, no current flows at all. I have read in other threads about fusible resistors and found a link to a manual. Unfortunately, it's a dead link.Any ideas where to get a manual and/or start troubleshooting.I love this meter - it's my go-to for just about everything.Thanks.

author: picburner
author_rank: Frequent Contributor
timestamp: January 06, 2021, 06:19:57 pm
content: The manual can be foundhere.There are two fuses in series on the mA range: F1 and F2.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 06, 2021, 06:49:18 pm
content: Thank you

author: bob91343
author_rank: Super Contributor
timestamp: January 06, 2021, 08:21:02 pm
content: You may have destroyed the current sense resistor.
Rigol giving away free DG992's? - Page 1
Forum section: electronics / testgear

author: pwnell
author_rank: Regular Contributor
timestamp: January 06, 2021, 04:37:05 am
content: I ordered a DG972 that arrived today. I booted it up, tried to set the max sine wave frequency and it was naturally locked to 70MHz. I then went to Rigol North America and downloaded the official latest firmware - here:https://beyondmeasure.rigoltech.com/acton/formfd/1579/0025:d-001bI installed it (folder name SardineII(ARM)Update(Normal)00.02.02.00.00, file name SardineUpdate.GEL) from a USB, and after the update my SN is defaulted and the model number shows as DG992. Indeed - I can generate 100MHz sine waves. What just happened? Did Rigol just give away a free upgrade? I did NOT have any patch files on the USB from this forum to hack it.
Ref file for import into Rigol DS1054z - Page 1
Forum section: electronics / testgear

author: Muggs
author_rank: Newbie
timestamp: January 05, 2021, 11:18:30 pm
content: Hello All,Complete electronics noob here. At least when it comes to oscilloscopes.I bought my DS1054z a week or so ago, and have been watching everything I can on YB (mostly EEVblog channel).Anyway, what I can't find out for the life of me is how to import a ref file in. I tried making a sine way in excel and export out as CSV, but no joy. I can't even find a file online to import.I do realize that importing a reference file that i have nothing to reference it to is a bit silly, but I'm just going though all of the buttons and this one has me stumped.So... If anyone has an idea of why my CSV file (BTW, i renamed the extension .ref) won't load or has a ref file that they are willing to post, I would be most appreciative.TIA,Muggs
Anritsu MT8802A manual - Page 1
Forum section: electronics / testgear

author: Kevinrea
author_rank: Newbie
timestamp: January 04, 2021, 09:23:10 pm
content: Hi guys,Does anyone have a copy of the manual for this unit that I could download?I've been looking through Google but I haven't found one yet.Thank you very much in advance.Kevin ReaLancaster California
Sencore LC77 Manual, schematics, cal procedure and circuit description uploaded - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: January 04, 2021, 06:38:03 pm
content: The service docs on the LC77 have been elusive for a number of years, however I have just found my original doc package from Sencore on the LC77. The scans are too large for here, I have uploaded them to the Sencore Groups.io, BAMA and Ko44bI also have a firmware image, I'll put it in the same spots once I find my USB floppy disk.
Fluke 187 voltage measurements   - Page 1
Forum section: electronics / testgear

author: era007
author_rank: Contributor
timestamp: January 04, 2021, 03:58:09 am
content: Hi,I have a Fluke 187 and I found out when I change polarity of the leads in DC V mode there is a 0.011V difference. My other multimeters don't have this issue . what could be the cause for this ?Thank youc

author: bob91343
author_rank: Super Contributor
timestamp: January 04, 2021, 06:01:02 am
content: What do you read when you short the leads? There should be a zero adjustment that needs attention.

author: era007
author_rank: Contributor
timestamp: January 04, 2021, 06:41:58 am
content: it shows 0.0000 V when leads are shorted

author: bob91343
author_rank: Super Contributor
timestamp: January 04, 2021, 05:48:20 pm
content: Try a different set of leads.