hybridfree/eevblog-posts huggingface dataset:
Kunkin KP184 mA range issue - Page 1
Forum section: electronics / testgear

author: belzrebuth
author_rank: Frequent Contributor
timestamp: June 17, 2020, 08:21:25 am
content: Hi,I've got a Kunkin KP184 PCB version 3.0 which has a funny response in the mA range right out of the box.The issue is that its measurement has a constant offset of 10mA.Starting at 10mA I get no reading at all on my meter.With the load set at 20mA I see 10mA, when load is set at 30mA I get 20mA, at 40mA I see 30mA etc.Is this a calibration issue?Or something else might be at fault?Calibration procedure is pretty straightforward but requires a 25A current source which I don't have so I can't really proceed with it..I've attached a picture of the problem.With the load set to draw say 110mA I only see the 100..This happens all the way down to 20mA.At the 10mA there is no current draw from the load.

author: vladant
author_rank: Newbie
timestamp: May 17, 2021, 09:55:24 am
content: Hi, I guess it is not very accurate on measuring small currents, after all it is a 40A device so it has low resistance current shunt. Plus it is a very noisy piece of hardware, look at the "kp184 ripple" thread on this forum. I have just started digging in KP184 ver.4 with an oscilloscope - it is full of unpleasant surprises.

author: belzrebuth
author_rank: Frequent Contributor
timestamp: May 19, 2021, 09:26:26 am
content: From what I've seen in a YT video it seems that after calibrating the unit it seems pretty accurate in all ranges.But I don't have the means to perform the calibration.It needs a high current source (~40A) and possibly a second unit so I just gave up on it.I'm only using it to test power supplies since my mA range is pretty much useless on my unit which is lame but it's still useful for its price and size.
Agilent/Keysight power supplies humming ! - Page 1
Forum section: electronics / testgear

author: felixsys
author_rank: Contributor
timestamp: May 16, 2021, 12:42:48 pm
content: Hello !I think one of the most typical and common "feature" of keysight / agilent power supplies is the humming noise. (E36 series)I don't have this issue with keithley/siglent or rigol power supplies, Is something typical with Agilent/Keysight/HP.What can be the reason ? Bad quality transformer ? bad lamination ?Is possible to reduce this annoying humming?I think I'm not the only one who's going crazy with this sick noise.

author: gamalot
author_rank: Super Contributor
timestamp: May 16, 2021, 01:00:47 pm
content: I think it may be caused by the high mains voltage. My mains voltage is usually between 250 and 260V. My 4 Agilent power supplies (E3640A, E3642A, 6612C, 66319B) have humming noises.

author: felixsys
author_rank: Contributor
timestamp: May 19, 2021, 08:48:38 am
content: I measured the mains voltage and is max 240V, same here all my Agilent power supplies makes me crazy with this noise.especially when there are two or three that are running at the same time .. it's humming bird party !Agilent/Keysight should deliver noise canceling headphones as a default accessory with the power supplies: D

author: HighVoltage
author_rank: Super Contributor
timestamp: May 19, 2021, 11:40:40 am
content: I have / had many Agilent Keysight power supplies over the years and may be one or two were humming. All the others did not have this problem. So, I would conclude that it is a transformer problem but only on a few transformers from a "Monday" transformer production.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 19, 2021, 02:34:29 pm
content: I think it may be this indeed - either Friday afternoon parts/assembly or perhaps individual to some series. I have a HP6113A and a much newer Keysight E36312A - both very silent in the humming department (the Keysight has a fan, so under load it gets a bit noisier)
HP 54717A calibration module for HP 547xx scope - Page 1
Forum section: electronics / testgear

author: Daxxin
author_rank: Regular Contributor
timestamp: May 18, 2021, 04:57:11 pm
content: i got the trigger module thats looks like the calibration plugin , impossible to find , who has any info pls share , schematic and eeprom content to replicate it thanks.
KP-184 Carrying case - Page 1
Forum section: electronics / testgear

author: SpecialK
author_rank: Regular Contributor
timestamp: May 17, 2021, 09:35:30 pm
content: I'm enjoying my KP-184 electronic load very much. However, I would like to take it out in the field and test 48V UPS battery packs at field locations. I have a more portable BK Precision 601B, but it only tests 6V & 12V batteries.I think I could put a handle on the top of the unit, but the power cord and test leads would need to be carried loose or in an attached pouch. I'm thinking I should be able to get some sort of carrying case. A leather one would be cool, but I'm think a resin plastic one might be much more available. A Pelican is probably overkill.What is the term I should be searching? Tool box, plastic tote, ammo box, field box? Any recommendations?

author: duckduck
author_rank: Frequent Contributor
timestamp: May 17, 2021, 11:17:38 pm
content: Try "airtight case" or "waterproof case". There are tons on Aliexpress. I know that Harbor Freight Tools in the USA sells cheaper Pelican knockoff cases. I don't know if that helps you in Canada.

author: SpecialK
author_rank: Regular Contributor
timestamp: May 17, 2021, 11:41:24 pm
content: Quote from: duckduck on May 17, 2021, 11:17:38 pmI will give that a try. In the meantime, I found a small piece of luggage my wife has never used. It says it's a tote bag(I think that's incorrect) and it's a nice size. Has a separate zippered compartment I can keep cables in which should keep the perspex from getting scratched. I might make a foam to slip over the front connectors and guard them from bumping. Good enough for the trunk of the car. Boot of the ute, or whatever the bogans call it.
Uni-t 2102CEX Oscilloscope  - Page 1
Forum section: electronics / testgear

author: Sherridan
author_rank: Newbie
timestamp: May 16, 2021, 06:58:02 pm
content: Does anybody know if it’s possible to hack this scope past 100Mhz. Also I don’t seem to find general firmware updates on there website. Any help would be appreciated
Vintage Instruments Manuals - Page 1
Forum section: electronics / testgear

author: Trader
author_rank: Frequent Contributor
timestamp: May 15, 2021, 06:16:40 pm
content: Seems to be one of the biggest collections of vintage instruments manuals from several brands.http://bee.mif.pg.gda.pl/ciasteczkowypotwor/AP, Adret, Advance Instruments, Advantest, Analigic, Anritsu, Arlunya, Atten, Avantek, Avo, Awa, B&K, B.W.D, BK precision, Ballantine, Belco, Bird, Boonton, Calstan, Cossor, Cushman, Dana, Datron, Delta Elektronika, Dick Smith, Dolch, Du Mont, EIP, EMG, EMI, ESI, Eddystone, Eico, Elektro - Automatik, Fairchild, Farnell, Ferisol, Fluke, GW Instek, General Radio, General Resistance, Goldstar, GoodWill, Gould, Gould Advance, Grundig, HP, Hameg, Heathkit, Hitachi, Huges, Hung Hang, IEC, IRH, Inne, Iwatsu, Jak ustawi, KIT-y polskie Jabel Nord Elektronik, KWH, Katalogi itp, Keithley, Kenwood, Kepco, Kikusui, Krohn Hite, Lafayette, LeCroy, Leader, MFJ, Marconi, Mastech, Mercury, Metex, Metrix, Micronta, Mierniki, Motorola, Mullard, NDN, Narda, Nicolet, Nordmende, Obliczanie limitera, Oritel, Palec, Palomar, Panasonic, Philips, Polskie mierniki, Pracitronic, Prema, Protek, R&S, RE Radiometer Copenhagen, RFT, Racal, Radameter, Radiall, Rigol, Robotron, Rosyjskie, Ruskie, Sanwa, Schlumerger, Scientific Atlanta, Shiba Soku, Siemens, Sinclair, Slade, Solar, Solartron, Systron Donner, TEC, TMC, Tandy, Taylor, Tek, Telefunken, Telequipment, Telewave, Tesla, Thandar Sinclair, Topward, Transpro, Triplet, Unaohm, Uni-t, University, Velco, Voltcraft, Wandel Golterman, Wavetek, Weller, Weston, Wiltron, srs, statron.

author: tautech
author_rank: Super Contributor
timestamp: May 15, 2021, 07:46:48 pm
content: Thanks.We have that website and many more over in this sticky in the Repair form:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/msg478132/#msg478132
Philips PM3050 oscilloscope failure - Page 1
Forum section: electronics / testgear

author: BChT
author_rank: Newbie
timestamp: May 12, 2021, 11:07:40 am
content: Hello everyone! I recently bought my first scope philips pm3050 and it was advertised as tested and fully functional. However now, when it arrived i noticed it has broken of potentiometer and also the handle is stuck on in one position and therefore i can't tear it down. I tried to turn it on, but it makes weird high pitch noise and both the crt and the lcd don't turn on. I checked the resistance on the mains connector and it's 1MΩ. I don't know if I'm doing something wrong, because it's my first scope, but it seems like it's faulty. Please tell me if you know what it could be, I'm not sure if I can repair it, but I can try.

author: TrendX
author_rank: Contributor
timestamp: May 12, 2021, 11:46:28 am
content: You can adjust the handle by pulling it away from the case on both side for a few millimeters. This reveals the locking pins and allows it to rotate.The buzzing noise most likely comes from the input filtering caps on the power supply. I had the same problem with mine a few months ago and fixed it by just replacing these 3 caps.EDIT:User manual:https://www.allaboutcircuits.com/test-measurement/oscilloscopes/pm-3000-series-3050/manual/Service manual for the 3055 which should be near identical:https://www.qsl.net/vk5bar/AHARS-Resources/Philips%20PM3055/PM3055%20Service%20Manual.pdf

author: BChT
author_rank: Newbie
timestamp: May 12, 2021, 05:00:37 pm
content: Thank you for help, i think i will replace those caps and it should be fine.

author: richipedia
author_rank: Contributor
timestamp: May 15, 2021, 12:34:51 pm
content: I have had 3 PM3050/PM3055 in total now.The power supply makes this buzzing sound if one of the outputs is shorted.One reason for that may be that one of the buffering caps failed short.Another reason is the following: the power supply has an overvoltage protection for the +5V rail. Also, there is some kind of overload protection stated in the service manual. If one of those two fault conditions occur, a crowbar circuit is activated, which shorts the +48V and -48V rails.
DSOX1000 export waveform and H5 files - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: May 14, 2021, 11:48:55 am
content: Hello Mates,while saving from the DSOX1000 the csv file contain only 2K points, is there a way to save up to 1M points?Also, any tool to open the h5 files? Do they contain the full 1M registry?Greetings, renan

author: Venturi962
author_rank: Regular Contributor
timestamp: May 14, 2021, 12:22:09 pm
content: Per the manual (page 83/84), it looks like you can get up to 50K points when saving to CSV. This can be changed in Settings > Length"When saving to a CSV format file, the maximum number of data points is 50,000."Looks like can get 100K points over USB | SCPI, but this would require some coding. More details on Page 627 of Programming Manual"MAXimum or RAW will allow up to 100,000 points to be returned."
Another one for an oscilloscope advise; anybody familiar with the Foxwell OS100? - Page 1
Forum section: electronics / testgear

author: sterretje
author_rank: Newbie
timestamp: May 14, 2021, 10:13:38 am
content: Let's start with a short introduction. My name is Wim and I'm an electronics engineer by trade. I however ended up in the PC world as a programmer, tester, support engineer and so on. As a result my electronics skills are extremely rusty (last embedded hardware design and programming 20 years ago). Funds are limited as I have been laid off recently (no worries, please) so I have to be careful.I've picked up Arduino as a hobby a few years back to get back into electronics.As many, I'm in the market for my first oscilloscope. It's to accompany one of those cheap 25MHz 8-Channel USB based logic analysers. It will be used to analyse waveforms on e.g. the I2C and SPI bus, PWM signals and so on; so BW requirements are not extreme (possibly a few MHz).I went throuh all 26 pages ofhttps://www.eevblog.com/forum/testgear/owon-vds1022i-quick-teardown-(versus-the-hantek-6022be)/; very impressive work by camille, gyro and indman (and laurentbr). Local price of the Owon VDS1022I is ZAR 2600. To put this in perspective, the Siglent SDS1052DL+ goes for ZAR 6300.Just before pressing the button for the purchase, I however stumbled over a Foxwell OS100 (https://www.takealot.com/foxwell-os100-oscilloscope/PLID71978770); it's nearly 3x as expensive but with a gift voucher I can buy it for ZAR 4000; I will have to invest in some probes though. The quick specs areProduct Features:FourChannels, MaxBandwidth: 250MHz/200MHz/100MHz/70MHzMaximum real-time samplerate: 1GSa/sMemorydepth: 64K/CHAutomatic setup for ease of use(AUTOSET)Built-in FastFourierTransformfunction(FFT)20 Automatic measurementsAutomatic cursor tracking measurementsWaveform storage,record and replay dynamic waveformsUser selectable fast offset calibrationAdd, Subtract and Multiply Mathematic FunctionsSelectable 20MHz bandwidth limitWaveform averageSo I will get 4 channels with a higher BW, a higher sampling rate and a deeper memory compared to the Owon. It also seems to have a waveform generator. I do understand from the user manual (https://www.obdii365.com/upload/pro/foxwell-os100-four-channel-oscilloscope-user-manual.pdf) that memory (and sampling) is shared between channels but it still sounds extremely good.So the question is now what is wisdom? Go for something with lesser specs which is well known or something that seems to be quite unknown? Any advise regarding this scope and Foxwell in general?Note:Buying on ebay/ali/banggood is not quite an option as import duties, VAT and the likes will probably cause extremely unpleasant surprises.
Tektronix TLA704, installing large disk drive - Page 1
Forum section: electronics / testgear

author: CambridgeMart
author_rank: Regular Contributor
timestamp: May 13, 2021, 10:54:12 pm
content: I have a TLA704 which I am upgrading to Windows 98SE and system software version 3.2. Whilst at it, I wanted to fit a larger disk drive; the smallest I have is 30GB. In theory, I can use this provided I have a disk overlay installed. However, that's where I have a problem, with the drive installed and set to maximum capacity the BIOS supports and with LBA mode enabled, the analyser starts booting from the floppy but stops half way and appears to have crashed (won't response to CTRL-ALT-DEL and the Caps lock key is unresponsive). If I leave the drive connected but set the CMOS setting for the primary master to NONE, it boots fine.Am I chasing a dead end trying to use a drive larger than 8.4GB?
Rigol MSO 5074 Hack ( what's the story so far ) - Page 1
Forum section: electronics / testgear

author: Steve12366
author_rank: Newbie
timestamp: May 04, 2021, 05:08:04 pm
content: Rigol MSO 5074 is currently being knocked out cheap with a few software bundles thrown in. Are these less buggy now, and are they hackable without a big headache.Thanks Guy's

author: I4E
author_rank: Regular Contributor
timestamp: May 06, 2021, 03:28:04 am
content: They have fixed many of the bugs which the units had when they first came out. If there was anything in particular you'd read that you'd like to ask about - I'd be happy to try an answer it for you.As we are authorized distributors- I can't comment about the hack.If you decide you'd like a quote please get in touch :-)It's not mixed signal and sample rate isn't as high so may not be right for you but we also are distributors for the Micsig scopes too.https://www.instruments4engineers.com/micsig-to1104-100mhz-tablet-oscilloscope-micsig-distributorSincerelyMiss Joy TorresInstruments 4 Engineers ltdOffice: +44 (0) 161 871 7450www.instruments4engineers.com

author: normi
author_rank: Regular Contributor
timestamp: May 13, 2021, 12:44:57 am
content: Quote from: Steve12366 on May 04, 2021, 05:08:04 pmSearch the forum there is a long thread on hacking. I think the hack is just as simple as plugging in a USB stick.Most bugs would have been fixed, but all the scopes available out there have a bug list so you won't get around that, I have not found any show stoppers, and any concerns I have reported to support and they always answer and provide solutions. The other issue I discovered is that somethings are not bugs but result from persons not reading the manual.Based on the chips used to get that extremely high sample rate, the noise floor is higher than the low sample rate models.
NanoVNA-F V2 3GHz with 4.3" IPS  - Page 1
Forum section: electronics / testgear

author: rf-loop
author_rank: Super Contributor
timestamp: May 19, 2021, 07:41:24 am
content: I tried to find this model thread from forum but I can not find. Also this is quite different VNA even when it is based to other nano VNA's. But also this is quite different.Building quality looks better than any Nano what I have seen (I have Nano VNA V2 3.2" "black and gold" (well made "clone") and more new NanoVNA V2plus4 from official source.This NanoVNA-F V2 3GHz is so different that I think it earn its own topic. About more common NanoVNA's there can find LOT if discussion and info everywhere around web. But about this NanoVNA-F V2 3GHz nearly like nothing. Bit surprice because when I take this to my hand it can immediately feel it is well and seriously made. It came in plastic box box, including cheap cal kit and 2x 20cm 405 cable. USB connector is C as it should be in 2021.manufacturer, Sysjoint, web side Basic Performance information looks obsolete. Perhaps based to some early hw/FW version.Also User Guidel is highly obsolete based to FW 0.1.0. Today max points is 201 and with PC software nano saver, can of course get more resolution using multiple segments, as is also used in my image below. Of course this is not max limit at all.Also it support direct screen shot from its display using Nano-saver.There is also some features what are not available in Nano VNA V2.Finally I have NanoVNA what have TFT suitable to my old eyes. 4.3" 800x480 IPS.S11 and S21 dynamic range is ok but bit less than latest NanoVNA V2plus4.But for my use this new F model is well ok.Also they have developed system so that FW update is easy. In update mode it looks like just one USB stick and just move update file to this drive and thats it, really clever! No any hassle with Nano-QT software etc.Price here in China was under 100 euro including delivery (purchased from Taobao, from one very very good trusted seller).There is more new FW than this what I have now (just out from box). I have updated it to latest 0.2.2 but have some problem (perhaps my some mistake or something what I do not yet know) with connection to NanoVNA-saver 0.3.8 software in windows. So I return it back to 0.2.1 version.Here one test image how it looks just after cal. Port 1 50 ohm load and Port 2 open.Bit poor quality picture.Box is really strong aluminium profile and well finished.5000mAh battery give long run, manufacturer claim is 7 hour. Have not tested.Perhaps I want later look what couplers they have used in Port 1.Do anybody know more about this hardware?

author: rf-loop
author_rank: Super Contributor
timestamp: May 22, 2021, 11:41:49 am
content: I hope someone can recognize these baluns and how are these overall quality.Attached some images about these and then some other random detail images.Sorry poor images, available is only just some poor phone camera obscura.Question is:Who is most likely manufacturer of these baluns and what model, most likely?
Alternating pulse polarity with Siglent SDG 1062X - Page 1
Forum section: electronics / testgear

author: torquil
author_rank: Regular Contributor
timestamp: April 23, 2021, 11:17:04 am
content: My Siglent SDG 1062X is generating pulses at each trigger signal input, but I would like to have it generate pulses of alternating polarity, e.g. a positive going pulse on the first trigger occurrence, and then negative on the next, then potitive, and so on. Can it be done directly with the SDG 1062X? If not, what would be the simplest way to achieve this? Set up each channel with opposite polarity and then somehow set up some switching between the outputs?The trigger signals are not regularly spaced in time.

author: tautech
author_rank: Super Contributor
timestamp: April 23, 2021, 08:40:23 pm
content: As you've discovered the UI won't allow for this however it could be done as a Arb waveform uploaded and saved into the SDG. Have a look at doing it in EasyWaveX and use a single or continuous Burst manually triggered.

author: egonotto
author_rank: Super Contributor
timestamp: April 23, 2021, 11:45:53 pm
content: Hello,could you explain how this go with Arb?Best regardsegonotto

author: tautech
author_rank: Super Contributor
timestamp: April 24, 2021, 04:00:09 am
content: With polarity, amplitude, period, duty, pulse, frequency, and burst SCPI commands.https://int.siglent.com/u_file/document/SDG_Programming%20Guide_PG02-E04A.pdf

author: torquil
author_rank: Regular Contributor
timestamp: May 05, 2021, 07:21:13 pm
content: Hmmm, could you please elaborate a bit on how it could be done? I did not mean to generate a pair of opposite polarity pulses at each trigger event. I meant that each trigger event should be followed by a single pulse, but with opposite polarity each time a new trigger event happens.

author: JohnPi
author_rank: Regular Contributor
timestamp: May 08, 2021, 05:29:24 pm
content: I haven't tried this, but could you use both outputs tied together (== summing them), and have each set to burst (N=1) mode; one with +edge trigger, the other with -edge ? You could then get a + pulse on your trigger rising edge, and a - pulse on the trigger falling edge.Else, if your triggering is quite slow (say < 1/s), in principle, you could reprogram it between trigger pulses.

author: torquil
author_rank: Regular Contributor
timestamp: May 12, 2021, 10:29:41 am
content: Interesting suggestion. Unfortunately, I cannot influence the trigger signal at the source, but perhaps I could do something like what you suggest if I process the trigger signal on its way towards the signal generator. I haven't checked in the SDG1062X if I can set each channel to react to different trigger signal edges, but it would be nice if that was possible.
Do linear power supply switch range? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 11, 2021, 01:41:29 pm
content: I just bought a Matrix MPS-3605LP last month. It's a 36V 5A power supply. I found it's OK for the price of $129 but I notice something. I hear relay clicking when I adjust the voltage between 12-13V and also between 25-26V. So do you think that it switches the input voltage so to reduce the voltage difference between input and output which can cause it to get very hot?

author: HKJ
author_rank: Super Contributor
timestamp: May 11, 2021, 02:08:32 pm
content: Quote from: BeBuLamar on May 11, 2021, 01:41:29 pmYes, many linear power supplies has relays to change input voltage.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 11, 2021, 02:10:48 pm
content: Yes, this is very common for lineair power supplies.Ever since the '70-ies or earlier they use transformers with multiple taps to reduce dissipation in the power supply.Dave has made a teardown of the Korad 3005 power supply long ago, and you will find something similar in almost any variable output lab power supply.A more modern approach would be to use an SMPS with variable output voltage as a pre regulator, and then a linear regulator (which drops just a few volts) to clean up the switching noise, but these are not so common. My guess is that if you want to make a low-noise power supply, then the cost and weight of a chunk of iron in a transformer is still attractive because it just does not generate any HF noise by itself. The weight is also not an issue for a power supply that just sits on a shelf.There are lots of SMPS modules, which are cheap and practical for delivering lost of raw power, but these have quite some switching noise.

author: radiolistener
author_rank: Super Contributor
timestamp: May 11, 2021, 02:22:48 pm
content: Quote from: BeBuLamar on May 11, 2021, 01:41:29 pmyes, high voltage drop on linear regulator leads to a high heating and low efficiency. Reduce voltage with relay switch between different transformer output allows to reduce voltage drop and heating. Relay switch doing this job.
Tektronix 1225 - Page 1
Forum section: electronics / testgear

author: Floopy
author_rank: Regular Contributor
timestamp: March 16, 2018, 12:50:08 am
content: Hello all,I recently acquired a Tektronix 1225. It came with a bag labeled "Tektronix 1240 Probes". At first I though, "great I have the probes". Upon further inspection, I noticed the probes were not the right ones. 1240 is the model number of another logic analyzer.Anyone know what are the right probes I need. It came with 5 other probes, I put pictures of them below. The analyzer itself works, but without probes it's a big paperweight.Also, is anyone interested in a ROM dump.If anyone has suggestions I would welcome them.

author: Floopy
author_rank: Regular Contributor
timestamp: March 16, 2018, 12:51:26 am
content: The probes

author: EE-digger
author_rank: Frequent Contributor
timestamp: March 16, 2018, 01:39:08 am
content: I have a 1220 and it uses 2, P6442 16 Channel Active Probes.It's a nice little analyzer but the keypad buttons can become sluggish from sitting without use. You can literally sit watching TV and keep pressing them hundreds of times. Makes a big difference.I believe the 1220 at least and probably the next few models, were orphans that Tek purchased from a 3rd party.The problem with these is that small, USB interface logic analyzers are fairly inexpensive and much easier to use.

author: Floopy
author_rank: Regular Contributor
timestamp: March 16, 2018, 02:59:35 am
content: Quote from: EE-digger on March 16, 2018, 01:39:08 amTrue, but I got it for a low price and I believe I should at least try to use it.BTW, I got the ROMs but I can't post them here.

author: Floopy
author_rank: Regular Contributor
timestamp: March 16, 2018, 03:06:03 am
content: Oh no, Oh no, Oh no, Oh no, Oh no, Oh no, Oh no, Oh no,Okay I did a stupid mistake. I pulled out the ROMs and dumped them all EXCEPT for the printer ROM. I plugged them all back in and I accidentally plugged the printer ROM backward. Upon powering I got a weird screen after some looking around I found that it was inserted the wrong way.I took it out and the device powered up fine, but upon inspection of the data, it was all corrupted!Does someone know where I can find a replacement. It was the printer ROM and it had the number 160-5531-01 PRINTER.I really messed up and I'm doubting that I will find a replacement file on the internet.HELP!

author: lkundrak
author_rank: Newbie
timestamp: May 11, 2021, 10:31:03 am
content: Hello. You still need the printer ROM dump?I got the same machine I suppose I could make one for you.
Capacitance tester for tonearm leads, cables for audio etc? - Page 1
Forum section: electronics / testgear

author: tyreman1
author_rank: Newbie
timestamp: May 10, 2021, 05:51:40 pm
content: Can anybody recommend a capacitance tester for measuring tone arm leads capacitance, RCA audio cable capacitance and speaker cable capacitance etcI see a B&K one(810c) that looks like it might do the trick?Thank you in advance

author: floobydust
author_rank: Super Contributor
timestamp: May 10, 2021, 06:25:02 pm
content: The B&K looks fine and not too expensive. Popular here is theDER EE DE-5000but I do not own one. I think you'd be measuring at least 100pF or so per foot.Multimeters can also measure capacitance, but you need some known accurate capacitors to verify, as they are not always accurate at the low end, and you need a REL or NULL button. Aneng AN8008 will read low range "0.108nF" so 1pF resolution and around 10pF stray but accuracy can be a few % out. It's good enough for the price.I have a Thorens TD-165 and measured the original tonearm shielded cable, it's tiny red or yellow. Found one colour has much greater capacitance, different plastic it seems. The factory coax is similar construction as far as the weave but one center conductor is thicker. Probably caused a lop-sided image.

author: tyreman1
author_rank: Newbie
timestamp: May 10, 2021, 06:29:47 pm
content: Yes multimeters can but my Fluke 28 II doesn't seem to go that lowpfThank you much

author: David Hess
author_rank: Super Contributor
timestamp: May 11, 2021, 03:45:40 am
content: Some multimeters can measure cable capacitance, but an LCR meter or impedance bridge would be ideal.For my own edification, I just measured the capacitance of a 42 inch RG400 patch cable using my DE-5000, and it was 105 picofarads so within an inch. My old Tektronix DMM916 multimeter measured 105 picofarads also which I consider pretty impressive for a handheld multimeter.Update: If you get a multimeter to measure cable capacitance, make sure it has picofarad resolution and a relative measurement function to zero the lead capacitance, although I guess you could subtract it yourself.
Advantest TR6847 multimeter manual needed - Page 1
Forum section: electronics / testgear

author: JMcC
author_rank: Contributor
timestamp: May 10, 2021, 08:42:20 pm
content: I'm guessing this is a long shot, but I'm desperate....I have an Advantest TR6847 DMM with a TR 13217 GPIB interface installed. I'd like to connect this to a PC, but have no info on the programming commands for it. I'd be grateful if someone could please point me in the right direction. I had a good search of the net, but so far nothing useful.Thanks,Joe

author: JMcC
author_rank: Contributor
timestamp: May 10, 2021, 10:09:40 pm
content: Curiously I found it by searching for the TR6845 manual!https://www.eevblog.com/forum/repair/advantest-tr6845-calibration-procedure-and-error-message-need-help/Joe
121GW with low serial number ok to buy? - Page 1
Forum section: electronics / testgear

author: bayjelly
author_rank: Regular Contributor
timestamp: May 09, 2021, 09:31:22 pm
content: Hello,I've got the chance to buy a 121GW which, judging by the serial number being < 180300000, seems to be from an early run.It looks to be in good condition, were there any troubles with these early batches that I should be aware of?Thanksbayjelly
8664 to 8665B upgrade done  - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: January 27, 2021, 02:52:13 am
content: And I have a result of +0Hardware needed:-ROM 8665B-Added 0-3 and 3-6 RF switch (note 8664A ROM will flip it to the 3 to 6GHz, output OFF)-MWEXT 8665B-Bypass rev protection or find the small 8665B rev power protection of the 6GHz (may loose 3dB)-U32 IO board matching the attenuatorCalibration steps:-MW Loop adj-HF driver adjust-Run the Recal GPIB software-Recal Special 171-Clear memory repeat and fix errors until Result +0Next upgrade, Pulse option... and add the Circulator (Isolator for Pulse option)Rewrite my Calibration code to use the power meter instead of just calculate on the inner tables...

author: d37duck
author_rank: Contributor
timestamp: May 07, 2021, 08:41:45 pm
content: Hi tchiwam,Nice work on the 8664 to 8665B conversion.I have a 8665B with early firmware. It came from Spokane, WA via eBay. I've been told HP developed the 8643, 8644, 8645, 8664 and 8665 instrument line there. My instrument is probably and early production unit used in HP's engineering. I also have a broken 8664B with Ver 4.2.2 firmware. I copied the four EPROMs on the controller board in multiple fill formats (S Records, HEX, and Bin) with an EQ-4X programming tool.I want to update the firmware in the 8665B to Ver 4.2.2 so I got four 27C010 EPROMs and loaded my Bin files into them. The programming worked but the 8665B thinks it is a 8664B and doesn't know about its doubler board (MW EXT).https://www.eevblog.com/forum/Smileys/default/embarrassed.gifI'm hoping someone has copied the controller board EPOMS from a 8665B with Ver 4.2.2 firmware, and is willing to post them. Has anyone haked Ver 4.2.2 firmware and willing describe the process?Regards,

author: d37duck
author_rank: Contributor
timestamp: May 09, 2021, 05:28:50 pm
content: Hi,In my previous post I claimed I have an Agilent 8664B signal generator. I fact the there is only a 8664A, which is what I have. I assumed any of these instruments with Version 4.2.2 firmware is a B version. This was my mistake. I also posted the wrong part type for the EPROMs. They are 27C1024. See the attached picture.Please accept my apologies,
HPAK Part Codenames - Page 1
Forum section: electronics / testgear

author: jjoonathan
author_rank: Frequent Contributor
timestamp: February 28, 2019, 04:54:50 am
content: HP / Agilent / Keysight often has fun with assembly names. Sometimes this takes the form of acronyms, which are typically well documented in the service literature:* RYTHM Tower (Router / YIG Tuned Harmonic Mixer)* SPAM Module (Signal Processing / ADC Module)* SODA (Source Oscillator + Doubler + Amplifier)Others are probably internal codenames or something. They pop up on Keysight Find-A-Part and ebay all the time:* Raven YTO (5087-7739)* Quattro Bridge(5087-7301) -- 4-port PNA-L* Cobra Bridge (5087-7794) -- PNA-X (43.5GHz, 26.5GHz, 13.5GHz, 8.5GHz)* Kailua Bridge (5087-7752) -- PNA-L (20GHz, 13.5GHz, 8.5GHz)* Napili Receiver () -- PNA-L* Hana Coupler (5087-7710) -- 26.5 GHz PNA-X* Lahaina Coupler (5087-7793) -- 50 GHz PNA* Molokini Coupler () -- 50 GHz PNA-X* Wyvern: DDS module powering many of the new SGs / SAs / VNAsI often only discover them one-at-a-time even though they seem to be an ongoing thing, especially with the couplers. I feel like this is something we would be able to read about in the HP Journal if only it were still going. Sigh. Looks like it ended in '98. HP Journal: the only victim of Y2K?Anyway, does anyone know anything they can share about these? Is there a list somewhere?

author: tautech
author_rank: Super Contributor
timestamp: February 28, 2019, 04:58:15 am
content: Have a good look herehttps://www.sphere.bc.ca/test/hpparts.html#cross

author: bitseeker
author_rank: Super Contributor
timestamp: February 28, 2019, 04:58:46 am
content: The names in the latter set do sound like code/project names. I don't have firsthand info about them. Maybe Daniel Bogdanoff will pop in and offer some insights.

author: KE5FX
author_rank: Super Contributor
timestamp: February 28, 2019, 05:00:30 am
content: Then there's the 8566 spectrum analyzer, in which the ACLU and CIA both play vital roles (Amplifier Coupler Load Unit and Coupler Interface Adapter, if I recall correctly).

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 07, 2021, 05:37:27 pm
content: Updated with new information!Quote from: Joel Dunsmore
Black Star Orion video signal generator manual - Page 1
Forum section: electronics / testgear

author: philpem
author_rank: Frequent Contributor
timestamp: May 07, 2021, 04:58:20 pm
content: Does anyone have a user's or service manual (or both?) for the Black Star Orion video pattern generator?Aim-TTI took over Black Star some years ago, but I've had difficulty getting a response from them. I guess my generator is too old for them to care aboutI'm mostly after the pinouts for the Dsub ports on the back, and specifications for the video signals it generates. A schematic would be nice to have in case I ever have to fix it...CheersPhil.
Siglent sds5000x discount at Batronix - Page 1
Forum section: electronics / testgear

author: techneut
author_rank: Regular Contributor
timestamp: May 07, 2021, 12:11:56 pm
content: I have been dubbing wether to buy a sds2104x+ or a sds5034x. Today I noticed on the Batronix webside a discount of 10% on a sds5034x only it stated valid until april 30th. I requested a quote and within an hour a got a quote with the discount and the free options. So now I am € 3072 poorer and waiting for delivery of a new toy.

author: 2N3055
author_rank: Super Contributor
timestamp: May 07, 2021, 03:53:44 pm
content: Congratulations... That was nice deal..
Schlumberger 4431 Signal Generator Manuals - Page 1
Forum section: electronics / testgear

author: NicBowyer
author_rank: Newbie
timestamp: May 07, 2021, 12:01:31 pm
content: Hi Foks,I have just picked up a Schlumberger 4431 Signal Generator and could do with some manuals to help get it up and running. If anyone has any info they can share I would be grateful.Thanks,Nic
Rigol 1054z missing channel 3 & 4 - Page 1
Forum section: electronics / testgear

author: adminics
author_rank: Newbie
timestamp: May 06, 2021, 10:32:33 pm
content: On Rigol 1054z suddenly missing Channel 3 and Channel 4. No reference to Channel 3 or 4 anywhere in menus, only Channels 1 & 2 show at bottom of screen, button lights do not light.Is there a setting that disables these? Something I am missing?Anyone seen this?Firmware 00.06.01Thanks

author: 2N3055
author_rank: Super Contributor
timestamp: May 06, 2021, 10:53:45 pm
content: You flashed wrong firmware for RIGOL DS1202Z-E on it..?

author: MarkF
author_rank: Super Contributor
timestamp: May 06, 2021, 11:18:22 pm
content: The latest firmware for a DS1000Z (4 channel) is 00.04.04.04.03 from here:https://www.rigolna.com/firmware/Follow along this thread to restore your scope:https://www.eevblog.com/forum/testgear/new-rigol-ds1054z-oscilloscope/msg3220616/#msg3220616

author: Fungus
author_rank: Super Contributor
timestamp: May 07, 2021, 04:24:13 am
content: Quote from: adminics on May 06, 2021, 10:32:33 pm"Suddenly"?Did nothing at all happen to it thatmighthave caused this?
Proskit SS-331 compatible nozzles. - Page 1
Forum section: electronics / testgear

author: I_Saldana
author_rank: Contributor
timestamp: May 06, 2021, 06:02:54 pm
content: Someone asked here, 120 days ago if it was know which nozzles from better brands were compatible with the SS-331. The forum suggested I create a new topic instead of replying. I looked for "SS-331" in general on the forum but couldn't find an answer to this specifically.https://www.eevblog.com/forum/testgear/just-got-a-desoldering-station-ss-331-(-100-250v-euro-version-)-more-tips/msg3115732/#msg3115732I was wondering the same today. Have any of you tried other nozzles from other/better brands on their cheap desoldering station.If this SS-331 is a clone they must have modelled it on something existing *shrug*If any of you used a washer.. cut a piece of the nozzle.. cut a piece off the ss-331 to make a good brand nozzle fit I'm curious about that as well.Google wasn't being my friend either.Regards.
Agilent 6611C Digital Control board help - Page 1
Forum section: electronics / testgear

author: sampler1
author_rank: Regular Contributor
timestamp: May 06, 2021, 03:56:05 am
content: Hi,I picked up an Agilent 6611C power supply but it has two issues. The Display is dim, that I can live with. Also it has some serious problems with the digital control board. Error 11.I checked all I can without a schematic but no luck. I have the crappy service manual but all the trouble shooting charts end in "Change the A2 board, digital controller PCB"Can anyone shine a light on this problem or even better a schematic?Regards
I need help to choose an oscilloscope. - Page 1
Forum section: electronics / testgear

author: irato
author_rank: Newbie
timestamp: May 07, 2021, 07:34:27 pm
content: Hi, my name is Mariano and I´m from Argentina. Sorry if my english is not so good.I´m studying EE, and I want to buy my first oscilloscope. The thing is that in Argentina we don´t have a lot of options so I have to choose one of these.Siglent SDS1102DL+Siglent SDS1102CML+Uni-t UTD2025CLUni-t UTD2052CLUni-t UTD2102CEXI want to know which one is better and why. As i said before, this is my first scope, so i don´t really know a lot about it. I´m kind of lost, because i don´t know if i should get a 25 MHz or 50? Should it have 1GSa/s? Or 500 MSa/s is ok?I would love to know your opinions. Thanks!

author: ledtester
author_rank: Super Contributor
timestamp: May 07, 2021, 07:51:18 pm
content: Get at least 50 MHz -- preferably 100 MHz.And get as many GSa/s as you can because the sampling gets shared if you use multiple channels.E.g. the Rigol 1054z has 1 GS/s so if you use one channel it has 1 GS/s available, but if you use 4 channels each only gets 250 MS/s.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 07, 2021, 08:15:04 pm
content: Mariano,Of all the options you listed, theSDS1102CML+is the best one. The main reason is because it has the deepest sample memory of 2M points, which is one of the strong arguments for a Digital Storage Oscilloscope (DSO).If you have the option to buy from Banggood or Aliexpress, the options are much increased, with much more modern models that bring you a lot more for the price (Rigol DS1054Z or Siglent SDS1102X-E, SDS1104X-U)Good luck in your quest

author: irato
author_rank: Newbie
timestamp: May 07, 2021, 08:22:50 pm
content: Thank you for the answer.

author: irato
author_rank: Newbie
timestamp: May 07, 2021, 08:24:44 pm
content: Quote from: rsjsouza on May 07, 2021, 08:15:04 pmHere in Argentina is not that easy to import things, so I can´t buy things from Banggood or Aliexpress.Thanks for the answer.

author: tv84
author_rank: Super Contributor
timestamp: May 07, 2021, 10:54:03 pm
content: If you prefer get a SDS1072CML+ and we'll upgrade it to 1102. Or 1152...

author: rsjsouza
author_rank: Super Contributor
timestamp: May 08, 2021, 02:39:45 am
content: Quote from: irato on May 07, 2021, 08:24:44 pmI feel for you; it is similar in my home country as well (Brasil), where the price can easily double if the package is caught by customs.

author: rejectmonke
author_rank: Newbie
timestamp: May 08, 2021, 06:43:34 am
content: On the entry end I haven't really seen anything as bang for buck than the 50MHz 4 channel rigol ds1054

author: irato
author_rank: Newbie
timestamp: May 08, 2021, 03:16:25 pm
content: Quote from: rejectmonke on May 08, 2021, 06:43:34 amEverybody said that, the thing is that here it cost like 900 o 1000 us dollar. So i can't afford it.But thanks anyway!
Rohde Schwarz RTC1000 - Page 1
Forum section: electronics / testgear

author: chj9183
author_rank: Newbie
timestamp: May 05, 2021, 07:46:43 am
content: Hi all,I am new to EEVblog.I got my R&S RTC1000 - fully loaded with 300Mhz+signal Gen+...I was wondering if the signal generator can be programmed to sweep?Has anyone experience with programming functions in the R&S scopes.ThanksRobin
How to repair a membrane keyboard? - Page 1
Forum section: electronics / testgear

author: Neper
author_rank: Frequent Contributor
timestamp: May 04, 2021, 12:30:40 pm
content: My Finest 7130 multimeter is still going strong but its membrane keyboard is beginning to disintegrate. The top layer has become brittle and is cracking at the positions of the most often used buttons.I have contacted Finest and they have no spares for this model. Is there any known method of repairing such keyboards?Ralf
Conductance test - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: September 10, 2020, 04:36:48 pm
content: Hi, I have good multimeters from Fluke and keysight, recent add to my bench a Hioki DT4253, I found this meter new a amazing price,I couldn't leave to buy it. Hioki has incredible auto range, ultrafast continuity, even I think is more fast than my fluke 87v or 179, I have 289 and u1282a, but I think these meters are to slow, even u1282a is more slow than 289, this week I found a Hioki DT4281, but is missing A terminal and nS function because is for electrical use , here start the proposite my post, is not common for me use nS function, but in this days I use this function for understand its functionality, the u1282a can measure up to 600 nS, around 1.6 Mohm, this meter can measure up to 600 MOhm therefore I think the 600 nS range is not functional I'm wrong? I think the conductance test is more functional in low value ranges because is more closet to high resistance values, but under 1 nS range the lectures are very unestables, I think the more correct application of conductance test is for measure resistors more than 500 MOhms for example.Conductance test also is not applicable for Insulation test because you need apply a high voltage to stressing insulation of electric machines. Even insulation test can't contemplate parasit capacitances in insulation, I use leakage current test this case and insulation resistance is more low even.Based in this I decided testing conductance in a Diode for found other use.Testing diode is 1N5399(up to 1000 V reverse voltage), with 5 multimeters and insulation tester.U1282Aconductance test 1.54 nS around 649 MOhmresistance test 645 MOhmFluke 289conductance test 0.66 nS around 1.51 GOhmresistance test OLFluke 87Vconductance test 0.41 nSResistance Test OLFluke 28II (similar ranges to 87V but different open circuit voltage)conductance test 1.62 nSResistance Test OLAgilent 34401A (not conductance, but wide range for resistance test)Resistance test OLFinallyFluke 1507 insulation meter1000V test, >11.0 GOhm, out of range also.I think the conductance test is in function of open circuit voltage in multimeter, u1282a and 28II it has similar values because open circuit voltage is around 3V, Fluke 289 and 87V has 5V and 7 V respectively, but when apply a true high voltage with insulation meter can apresiate the conductance measures in multimeters is not coherents, the result would be more low resistance value with insulation meter because the test voltage is closet to inverse voltage in diode.Conclution, I think the conductance test is not esential in multimeter. I hope your commentsRegards.

author: Trader
author_rank: Frequent Contributor
timestamp: May 18, 2021, 04:48:29 am
content: Very good point and experiments, thanks.
Sweeping a 10.7MHz Sine wave on a Keysight MSOX3054A Oscilloscopes WAVEGEN-How? - Page 1
Forum section: electronics / testgear

author: djsb
author_rank: Super Contributor
timestamp: May 04, 2021, 02:12:18 pm
content: Hi,Has anyone been able to create a swept 10.7MHz Sine wave on the DSOX3WAVEGEN of a Keysight MSOX3054A Oscilloscope? According to a Keysight video you can capture a waveform from one of the channels and store it. The video also mentions reading data from a text file stored on a USB stick (a CSV file I think). Has anyone been able to program the waveform generator to create their own swept signal? I think there is already a swept waveform already in one of the menu's however I would like to try creating my own waveform if possible. Has anyone tried this? Thanks.

author: MarkL
author_rank: Unknown
timestamp: May 04, 2021, 04:45:28 pm
content: You can copy a waveform from one of the input channels to the waveform generator. You have to select "Arbitrary" waveform mode and then "Edit" the waveform. There you will see a choice to "Store Source to Arb".However, the arbitrary waveform can only have a maximum of 8k points, so it's not really useful for doing any kind of sweeping.I think the best option for a swept waveform on this scope is to set up the generator for a 10.7Mhz sine wave output and select FM modulation. Then select the ramp waveform for the modulation input and a symmetry of 100% (creates a sawtooth) for a low-to-high frequency sweep. The slowest FM rate is 1Hz, and at a center of 10.7Mhz appears to have a maximum deviation of 186.9kHz.If you need a sweep outside of these bounds, you could have an external computer control the wavegen and simulate a sweep by stepping through the desired frequency range.