hybridfree/eevblog-posts huggingface dataset:
Small pin probe < 20 mils - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: March 02, 2019, 01:47:40 pm
content: At times I need to connect a probe to small through-hole test points that are in the 0.020-0.025" range. Typically low frequency.The commonly available jumpers I use have round pins of 0.025" diameterThese Mill-Max sockets make for a convenient way to adapt the 0.025" test probe to a 0.020" diameter, you can simply snap them on or off as required ->https://www.mill-max.com/assets/pdfs/065.pdfI'm looking for a slightly smaller version, under 0.020" pin diameter, any suggestions?

author: HalFET
author_rank: Frequent Contributor
timestamp: March 02, 2019, 02:20:41 pm
content: I use old probe station needles hooked up to a regular probe with a screw terminal. Works great, and you can even slide the tip underneath QFNs.

author: DaJMasta
author_rank: Super Contributor
timestamp: March 02, 2019, 10:20:31 pm
content: In the past, I've just gone with Kynar wire soldered in place. Takes only a few moments to put on if you have the solder station near you, very easy/clean to undo, and a more durable connection than most clips or points.

author: tautech
author_rank: Super Contributor
timestamp: March 02, 2019, 10:34:05 pm
content: For your own boards or general usage ?The Tek grabber you're using already is probably the best without needing to spend $$$ to get something better.For your own designs use some SMD test points and put a footprint onto a trace and define both pads to the same net to avoid any DRC errors. That also allows you to pull them out once testing is done and reuse them.In 0805 size ordinary scope probe hooks can easily be used for connections.
Just showing off.....  two OLD HP test gear recently joined my lab - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: March 03, 2019, 01:32:34 am
content: This is not a question. This is not even a suggestion. This is just me showing off new acquisitions.HP608E, the signal generator (10 - 480MHz) actually doesn't work. At least few tubes are suspect. Also, lots and lots of caps are of kind with bad reputations. Built like a tank. No PLL, no computers, mostly tube. I prefer nice looking one with electrical problems than the other way around. I can fix electronics. I am very limited on mechanical repairs.HP400H is a VTVM. Vacuum Tube Volt Meter. Basically an old FET multi-meter. A high impedance AC voltmeter for audio range. This one actually works. Came with a manual, too. Obviously some internal cleaning is necessary but outside is super clean. It came like this. Range switch needs some work.Perhaps these are not as practical today but very much fun to have. In late 70s, I had an HP608D. Fun thing is I can tune it to a ham band and SCREAM into the cabinet via holes. I can get some modulation. I had some fun with that one.Anyway, I won't do a "tear down" but am thinking of doing show-and-tell kind of video in future. Anyone interested?By the way, I am WELL aware of high voltages and got-cha's. No need to #include <std.warning>.

author: bitseeker
author_rank: Super Contributor
timestamp: March 03, 2019, 03:28:39 am
content: Very nice acquisitions! Teardowns, videos, etc. are all good and enjoyable to see.
Hacking Rigol DS6000 series oscilloscopes - Page 1
Forum section: electronics / testgear

author: gearedbyby
author_rank: Newbie
timestamp: January 03, 2019, 02:30:00 pm
content: hello,i get a rigol DS6000,i want to hack the decode option .i saw the keygen only support the ds1000z ds2000 ds4000 ,maybe nobody link to disassemble this series？let us make a keygen？

author: gearedbyby
author_rank: Newbie
timestamp: January 04, 2019, 02:39:38 pm
content: No one is interested in this?

author: DaJMasta
author_rank: Super Contributor
timestamp: January 04, 2019, 06:33:42 pm
content: I don't think a ton of people have one, so the interest is probably limited because of that. It's only been a day though, you may get a few users who show up...That said, it's usually a small minority of owners of the hardware that both want to hack it and have the skills to make it happen, so unless you want to do it yourself, I don't think the chances are that high.

author: gearedbyby
author_rank: Newbie
timestamp: January 05, 2019, 02:51:16 am
content: ok，thks，I will try it first.

author: tv84
author_rank: Super Contributor
timestamp: March 02, 2019, 05:40:53 pm
content: As we can easily see in the riglol thread, the DS6000 has a similar licensing scheme to the DS2000.The private_key is the same as the DS2000. That is visible in the riglol main.c code and in the .GEL.So you can use riglol to generate the key and I think the bestOptioncombination is the same as the DS4000 -RS39
VMA Spectrum Analyser Software for HP 8590 Series - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: March 01, 2019, 08:37:09 pm
content: Hi,I just published the first version of my "VMA Spectrum Analyser Software for HP 8590 Series" on my blog:https://vma-satellite.blogspot.com/2019/03/vma-spectrum-analyser-for-hp-8590.htmlThis version is basically the same in terms of functionality, as the other three versions (for R&S CMU200/CRTU, Siglent SSA3000X and SMA/NWT devices).It allows to apply many modern measurements, based on the spectrum sweeps of these devices.The software is free to use, but requires an activation code every 3 months. Against a "donation fee" I offer a permanent activation key.Right now I am unable to show the software in action, as both my HP 8594E have broken PSU's...Waiting for them to be fixed. Once the devices are up and running, I will post some pictures and videos.Feel free to try and use the software. It requires Keysight Connection Expert 2018.Regards,Vitor
detent encoders from rigol DS1045Z skip every second time - Page 1
Forum section: electronics / testgear

author: andz
author_rank: Newbie
timestamp: February 28, 2019, 10:29:44 pm
content: I recently bought a new oscilloscope from rigol specifically DS1054Z. Everything is working fine expect detent rotary encoders (for setting scale for vertical and horizontal axes) which skips every second time. I have to do two "clicks" in the same direction to move once. Or if I am "clicking" back and forth nothing happens. Do you have experience with something like that? Thanks for yours answers.

author: frozenfrogz
author_rank: Frequent Contributor
timestamp: February 28, 2019, 10:46:00 pm
content: Check out the latest firmware that has been released two days ago. From the release notes it incorporates an encoder fix.

author: andz
author_rank: Newbie
timestamp: February 28, 2019, 10:56:18 pm
content: Thank you for answer, can you link me for that specific update which fixes it. Latest I found was v00.04.04.03.05 from 2018/04/28.

author: andz
author_rank: Newbie
timestamp: February 28, 2019, 11:10:47 pm
content: I finally found it here:http://www.rigol.com/Support/SoftDownload/3Thank you very much again!

author: JohnPen
author_rank: Regular Contributor
timestamp: March 01, 2019, 05:39:09 pm
content: This latest firmware Version 04040402 solves the problem. Vertical gain, TB et al all work properly now.
Tek 6 Series MSO Mixed Signal Oscilloscope teardown videos!? - Page 1
Forum section: electronics / testgear

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: February 28, 2019, 03:53:08 pm
content: Hi,I'm interested in tear-down of recent scopes from Tek specially 5 and 6 series, Dave is it possible for you to ask tek to send them inif not, is there somewhere else to see it?

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: March 01, 2019, 09:20:52 am
content: Do we have the luxury of that?
Rigol DS2102...original_Channel 1 DEAD - Page 1
Forum section: electronics / testgear

author: hmlittle59
author_rank: Contributor
timestamp: March 01, 2019, 04:55:01 am
content: Hello Rigol Experts,I've damage Channel 1. It's NOT working. Channel 2 seems to be OK. Way, way, way out of WARRANTY. What should I look for if I decide to take it apart. Three (3) weeks ago I just purchased the Bundle Package and would hate to kick it to the curb(it has been very faithful).1) Channel 1 NOT working2) Auto works on Channel 2.....NOT #1HelpThanksHoward
Rigol DM3058E (5.5 digit DMM) replacement? - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: February 28, 2019, 08:30:04 pm
content: At the risk of starting a false rumor, I notice that:* TEquipment.net is selling their demo Rigol DM3058E at a discount:https://www.tequipment.net/Rigol/DM3058E-B/and,* This guy is selling a new one on eBay for way less than the going price (starting bid, anyway):https://www.ebay.com/itm/Rigol-DM3058E-5-1-2-Digit-Benchtop-Digital-Multimeter-with-USB-and-RS-232/283392792369This model has been around for quite a while, and doesn't have the fancy OLED display that some of its competitors do (other than that it's a very solid DMM for the price - I've had one for a few years).I'm wondering if this means that a replacement model is coming soon...? (I'm in the market for another one, which is why I noticed.)

author: tautech
author_rank: Super Contributor
timestamp: February 28, 2019, 09:28:55 pm
content: There comes a point when demo units are no longer needed for distributors and resellers when the product is well established in the marketplace and there are plenty of reviews and info about them online.Also, products can be part of a model series and it makes no sense to have demos of each model, only the top model in a line.I've moved a few on for the reasons outlined above.

author: Unknown
author_rank: Unknown
timestamp: March 01, 2019, 01:06:37 am
content: Maybe I'll bid on the eBay one, then.

author: LapTop006
author_rank: Unknown
timestamp: March 01, 2019, 03:25:31 am
content: Quote from: tautech on February 28, 2019, 09:28:55 pmOr they have half a dozen demo units early in a product's lifecycle, but pretty quickly the hubub dies away and having just one kicking around for test, demo, warranty loaner, etc. is fine.
HP5335A A and B trigger acting odd - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: February 28, 2019, 11:52:54 pm
content: I have four HP5335a and my concern centers around triggering.case 1Say I have 10MHz on input A. Trigger in AUTO mode, LED flashes on both A and BIs this the way supposed to be? There is nothing connected on B port.case 2Say I have 10MHz on input A. Trigger in AUTO mode LED flashes ONLY on port A. B is either not lit or steadily lit. It never flashes.Oddly enough I have case 1 and case 2, two each.By the way, if I connect signal to port B with nothing on A, 3 out of 4 has A and B flashing. Last one is either blank or steady depending on setting of trigger.

author: tkamiya
author_rank: Super Contributor
timestamp: March 01, 2019, 01:50:17 am
content: It sort of looks like cross talk. If I enable 50 ohm input, only trigger LED that flickers is the one input is connected.

author: tkamiya
author_rank: Super Contributor
timestamp: March 01, 2019, 02:23:51 am
content: It WAS a cross talk. When I reduced the input signal from 1Vp-p to 100mVp-p, the cross talk went away.
Stanley Labs SL114 counter - anyone know anything about it? - Page 1
Forum section: electronics / testgear

author: timgiles
author_rank: Regular Contributor
timestamp: February 28, 2019, 06:33:43 pm
content: Hi all,I am hoping to pick up a Stanley Labs SL114 counter (made in the old dart). The seller does not know any thing about it and even after my best google searches - I cant find much either. I think from an unanswered question on a UK forum it is a 50Mhz counter but other than that, seems it was built, used and put out to pasture b4 the internet had time to catch any info on it.So if anyone out there has used one in years gone by or has a manual, service manual etc.. - would be great to know something more about it.

author: Unknown
author_rank: Unknown
timestamp: February 28, 2019, 08:22:56 pm
content: The only hit I found online:https://www.vintage-radio.net/forum/showthread.php?t=73152That doesn't tell you much.From the looks of it, it's contemporary with the HP 5316A, which is a 100 MHz counter. But the front panel has "GHz" and "ps" markings, so maybe it's faster than that. Faster than 50 MHz, anyway, I'll guess.
Portable & programmable multimeter or scope for devices testing - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: February 28, 2019, 06:19:32 pm
content: Hello Mates,situation: guys in the assembly line or field repair need a simple and dumb proof method for testing some parts like: switches, pots and pressure sensors.Of course, just grab any multimeter and you are good, who can't read ohms and volts, right? Well, no this folks, must be dumb proof.Sooo, does any know any portable and programmable equipment, similiar to a multimeter (lets say, the same range of functions as a Fluke 79) but with some programming capability, around $200?Industrial grade would be nice, like a PLC+HMI.
HP 11713A attenuator driver modification for 15V and 5V - Page 1
Forum section: electronics / testgear

author: jfphp
author_rank: Regular Contributor
timestamp: February 28, 2019, 03:33:09 pm
content: Hello,A lot of HP/Agilent/Keysight attenuators operate now with 15V or 5V instead of the traditional 24V supplied by the 11713A. Is there a HXX option for these supply levels or did anybody modify the 11713A to accomodate these various command levels ? Thank you.
Questions about HP 1670e analyzer - Page 1
Forum section: electronics / testgear

author: Dan Moos
author_rank: Frequent Contributor
timestamp: February 27, 2019, 01:07:51 am
content: I just picked up an HP 1670e logic analyzer from eBay. Good price, and has all the probe leads for every pod (that was the main draw).I don't have it in hand yet, but it is the first piece if older equipment I've gotten that contains a hard drive. It was advertised as working, but I'm gonna assume that drive is gonna fail eventually.My main question is, is the firmware in ROM, or is having that drive drive fail the kiss of death? I also wonder how reliable the floppy drive on it is. I ordered a GPIB to USB adapter, but would prefer to use the floppy for things like firmware upgrades, and loading inverse assemblers.Thoughts?

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: February 27, 2019, 03:35:09 am
content: I have a 1670G. The firmware is in rom. The disk is just for saving junk/data. it can operate with out it.

author: gslick
author_rank: Frequent Contributor
timestamp: February 27, 2019, 10:01:00 pm
content: I believe Ethernet is standard on the 1670E. The easiest way to transfer files to and from the analyzer and to capture screen images is through FTP on the network.You can also configure the analyzer through FTP. For example:https://www.eevblog.com/forum/testgear/hp-logic-analyzer-inverse-assemblers/msg2209902/#msg2209902

author: TK
author_rank: Super Contributor
timestamp: February 27, 2019, 10:29:37 pm
content: The floppy is a standard PC 1.44MB HD 3.5inch drive and uses MS-DOS format, slim type. Easy to get a replacement on eBay.

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: February 28, 2019, 01:30:28 pm
content: Quote from: TK on February 27, 2019, 10:29:37 pmthey use LIF format mostly but can use msdos format.just something to be aware of.
Shepherd Scientific Model 770 Precision-AC-DC-OHM Calibrator - Page 1
Forum section: electronics / testgear

author: CrazyTiger
author_rank: Regular Contributor
timestamp: March 02, 2019, 01:00:56 am
content: Hi,Found an interesting instrument on ebay:https://www.ebay.com/itm/Shepherd-Scientific-Model-770-Precision-AC-DC-Calibrator-Tested-Working-Rare/292954061366?hash=item44356c3a36:g:klMAAOSwT-pcDuI0:rk:35:pf:0&autorefresh=trueFrom my understanding, this should be sort a Multi-calibrator like Fluke 5500, but there is zero info on the internet. I have communicated with the seller, he has no manuals, and according to him it was taken out working from a calibration lab hence the "tested" statement.Based on the picture I can say it is controlled via SCPI commands via GPIB port. Does anyone here knows about Shepherd Scientific?My research indicates it used be a medical instrument provider, but the actuall website is dead.

author: HalFET
author_rank: Frequent Contributor
timestamp: March 02, 2019, 01:19:38 am
content: Never heard of them, but that interface panel looks an awful lot like some of the older Valhalla Scientific calibrators (i.e.this one). Interestingly enough, Valhalla is also located in San Diego:https://valhallascientific.com/about/So odds are Shepherd Scientific = Valhalla Scientific.

author: HighPrecision
author_rank: Unknown
timestamp: March 02, 2019, 10:04:19 pm
content: I have a complete system composed by the model 770 AC-DC-OHM Calibrator and the model 120 Transconductance Amplifier for currents to 100A.These are very old instruments (late 80s), connected to an ancient DOS PC running a M$ GW-BASIC program.
Owon MSO7102 freezes - Page 1
Forum section: electronics / testgear

author: alexnzak
author_rank: Newbie
timestamp: February 26, 2019, 06:22:20 pm
content: We have rebranded version of Owon MSO7102 (Aktakom ADS-2182). Last time it used in logic analyzer mode. After shutdown and turn on next time it freezes. Oscilloscope boot as usual, open INFO screen and no reactions of keyboard. Used PC software by OWON for remote control - we see screen from oscilloscope and can't do anything. Firmware for this oscillator not available. May be it has hard reset mode? Any resolve for this situation? Video of turn on oscilloscope -https://yadi.sk/i/B3Fx3YekzncnIQ

author: Daruosha
author_rank: Regular Contributor
timestamp: February 26, 2019, 06:40:20 pm
content: My very first DSO was an Owon SDS7102 and after less than a month of usages, it showed the same issue.
Feeltech FY3200 grounding question - Page 1
Forum section: electronics / testgear

author: Gazmon
author_rank: Regular Contributor
timestamp: March 01, 2019, 08:59:33 am
content: Hi,Apologise for the separate thread about this and appreciate there lots on here about this, I just wanted some clarificationIs it ok the fit an IEC panel socket and run a ground cable to the BNC`s to eliminate the AC leakage issue , as this seems an easy fix.Will this still be ok to use with my oscillorscope, looking for the easiest safest fix pleasethanksGary

author: nctnico
author_rank: Super Contributor
timestamp: March 01, 2019, 09:20:52 am
content: Yes, that is the easiest fix. I did exactly this on my FY3200.

author: Gazmon
author_rank: Regular Contributor
timestamp: March 01, 2019, 04:37:31 pm
content: thank you

author: med6753
author_rank: Super Contributor
timestamp: March 01, 2019, 04:41:32 pm
content: I did the same with mine.

author: Gazmon
author_rank: Regular Contributor
timestamp: March 02, 2019, 02:37:05 pm
content: ok i bought this and it arrived today, initial AC leakage current gives me about 9v between the bnc and my mains earth,would anyone recommend i still do the earthing mod?tested between the unit and a socket its plugged in to

author: nctnico
author_rank: Super Contributor
timestamp: March 02, 2019, 02:38:39 pm
content: I'd do the mod just to be sure. 9V is enough to damage a sensitive device.

author: Gazmon
author_rank: Regular Contributor
timestamp: March 02, 2019, 02:43:07 pm
content: yep ok , cheers again

author: Gazmon
author_rank: Regular Contributor
timestamp: March 02, 2019, 05:14:42 pm
content: I have done the mod, im seeing 1.5 volts now, if you take into account the parallel earthing paths etc and interference in my house im guessing that this is an ok value?and I have the fy2200SP Model according to the sticker on the bottomwould you agree?

author: JohnPen
author_rank: Regular Contributor
timestamp: March 02, 2019, 07:06:30 pm
content: Out of curiosity I re-checked out the earth potentials between my modified FY3200S, my DS1054, home built PSU and found it to be 0v. Checking out my 3165 frequency counter, no mods, to the scope and my homebuilt PSU I did find a few ac millivolts difference in the earth potential. All this equipment is fed from a common 13A extender block. Are you measuring your earth connection from a common feed point which in my case is the mains socket feeding the extender block? If not it may explain the 1.5v reading you have.
Rigol DS1052E Math Functions Question - Page 1
Forum section: electronics / testgear

author: Winston03
author_rank: Newbie
timestamp: February 26, 2019, 09:49:20 pm
content: A question on the multiplication math fuction of the DS1052E. If I multiply two waveforms, what parameters of the resulting waveform can be displayed? In particular, my goal would be to determine true power using one channel to monitor voltage and another to measure current via a sense resistor. Both waveforms will be low voltage and relatively low frequency, but different in terms of wave shape and phase. I have seen a video showing how this is done with the DS1054Z which, of course, has many more features. It can effectively display watts directly. However, I have no idea if the DS1052E is capable of the doing the same and have not been able to find any such information. I currently do not own a DSO, but have a good analog scope that generally serves my purposes. However, determing true power becomes a real pain. If the now very low cost DS1052E could do the job, it would be good enough for most of what I would ever do. But can it? I am tending towards Rigol because it seems to have a good reliability history, which is important, especially if one finds a good deal on a used one.
Agilent E3632A Power Supply Transformer hum - Page 1
Forum section: electronics / testgear

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: February 26, 2019, 04:43:10 pm
content: Hello!Well, i've purchased for a reasonable price 1 E3632A power supply and i have a little concern. During switching on the unit i can hear transformer hum at startup which is not too loud but it is hearable. So my question is, is this normal on these power supplies or should i be concerned by that? Also, if i block the fan i can hear transformer sound which should be normal.I wanna hear your opinions on that.Thank you in advance!Hrvoje

author: HighVoltage
author_rank: Super Contributor
timestamp: February 26, 2019, 05:28:43 pm
content: Hello Hrvoje_CROI have two of these E3632A and both have an initial transformer noise, when turned ON.But after they are ON, there should not be any more noise.So, I think your E3632A is alright.

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: February 26, 2019, 05:51:29 pm
content: Hello HighVoltage!Thank you so much!Well if you block the fan you can hear the transformer but that is normal. Arghh, i am obsessive compulsive and i asked this because i've thought there is a problem with my supply. The worst thing for electronic technician is having OCDThank you again!Best Regards,Hrvoje
Brymen DMM Warranty and mods ?? - Page 1
Forum section: electronics / testgear

author: lordvader88
author_rank: Frequent Contributor
timestamp: February 26, 2019, 02:20:00 am
content: I have a Brymen BM869s and it's working fine, but the continuity buzzer is way too loud for just using in my room. I bought it new from ebay, maybe 2yrs ago. The guy sells a lot of them from Italy. Anyone know if there's any warranty on these from the factory ?If not, or if it was almost up, I want to drop the volume on this a bit and make the backlight stay on longer. If I can get in there safely. These have 2 PCBs and lots of funny connections I think.

author: coromonadalix
author_rank: Super Contributor
timestamp: February 26, 2019, 02:50:57 am
content: This model use a dedicated chipset, no specs have been found ..

author: lordvader88
author_rank: Frequent Contributor
timestamp: February 26, 2019, 03:06:40 am
content: I'd hope that changing a resistor would lower the volume, and changing some capacitor would increase the light delay.

author: radiolistener
author_rank: Super Contributor
timestamp: February 26, 2019, 03:09:01 am
content: Does your DMM shows measurement change when you rubbing display with finger?

author: ct1bxt
author_rank: Contributor
timestamp: February 26, 2019, 04:08:03 am
content: Just made the test and no change on mine.Rodrigo

author: radiolistener
author_rank: Super Contributor
timestamp: February 26, 2019, 07:00:11 am
content: could you try this:Select Voltage measurement, autorange and keep probes open.Then slide your finger from left down corner to up.Does it affect measurement result?My 867 shows voltage jumps up to 0.03 V.The same thing happens on R measurement, for 1 MOhm it may show even 0.3 MOhm at the moment of slide.Is this ok?I wrote to brymen support some time ago and they told me the following:QuoteAlso, when I slide finger from the left down corner to up, I see liquid crystal flashes on the display.It seems, like high static electricity is induced on the other side of plastic glass.May be there is need to use antistatic spray on the back side of the plastic glass?

author: indman
author_rank: Super Contributor
timestamp: February 26, 2019, 07:34:10 am
content: Quote from: radiolistener on February 26, 2019, 07:00:11 amIt is necessary to paste on the screen only a simple protective transparent film which protect displays of mobile phones.

author: gearedbyby
author_rank: Newbie
timestamp: February 26, 2019, 09:49:43 am
content: Connect the resistor to adjust the volume, design a repeatable trigger monostable control backlight

author: Gyro
author_rank: Super Contributor
timestamp: February 26, 2019, 02:28:02 pm
content: If it's a PCB mounted sounder (as opposed to a piezo disk glued to the back), then a simple self adhesive label stuck over the hole in the top usually provides about the right amount of sound attenuation.

author: ct1bxt
author_rank: Contributor
timestamp: February 26, 2019, 07:12:29 pm
content: Hi,in AC voltage, do the same hear, 0.034 volt.DC voltage, no change.RodrigoQuote from: radiolistener on February 26, 2019, 07:00:11 am
Siglent SDS2352X-E 350MHz Oscilloscope Review - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: February 25, 2019, 05:59:01 pm
content: Hi All,I just published my review for the SDS2352X-E, you may want to check it out.🔴 #520 Siglent SDS2352X-E 350MHz Oscilloscope Review - How Good Is The Siglent SDS2352X-E Scope ?https://youtu.be/7zJ8X51l0Go
Racal 1998 counter - anything other than buttons to check? - Page 1
Forum section: electronics / testgear

author: timgiles
author_rank: Regular Contributor
timestamp: February 24, 2019, 11:56:35 am
content: Hi all,Looking to get a Racal 1998 as my first decent counter for the new home lab I am putting together in a few weeks. I know what the switches are not great on the Racals, is there anything else I should be checking? Going to fit a new OCXO in a few months.Thanks in advance

author: wn1fju
author_rank: Frequent Contributor
timestamp: February 24, 2019, 12:51:54 pm
content: If it is anything like my Racal 1992 counter, and I think it is, there are two hybrid ICs on the motherboard. The one on the right side (I think it is IC18) has areputation of running extremely hot, to the point that it can burn itself up. I stuck a heatsink on my chip just to be sure.Is there a particular reason why you are looking at Racal? The HP 5334B (assuming you can find one with the GHz prescaler) is also a nice unit and is fairlyinexpensive on the used market. And there are a lot of modern Chinese no-name pieces that are less than $100US, not that they are as nice as the Racalor HP units.

author: HalFET
author_rank: Frequent Contributor
timestamp: February 24, 2019, 01:38:17 pm
content: Quote from: wn1fju on February 24, 2019, 12:51:54 pmIf you need 1 GHz the HP 5316A with C channel option is also a good deal. They have a decent service manual and are relatively easy to find. My only note on them is that you need to slide the cover backwards when opening them up. It's rather counter-intuitive if you first try to take one apart.

author: timgiles
author_rank: Regular Contributor
timestamp: February 24, 2019, 02:04:39 pm
content: Thanks for the advice and info - I'll take a look.

author: ct1bxt
author_rank: Contributor
timestamp: February 25, 2019, 12:33:58 am
content: Hi,I own an 1998 for several years and no issues so far.Very good machine.RegardsRodrigo

author: David Hess
author_rank: Super Contributor
timestamp: February 25, 2019, 03:06:09 am
content: I got my 1992 working by just cleaning the switches. If you are thinking of preventative maintenance, then the aluminum electrolytic capacitors should be changed.
Hantek DSO5102P old version firmware - Page 1
Forum section: electronics / testgear

author: gtr
author_rank: Contributor
timestamp: February 24, 2019, 04:55:20 pm
content: Hello everyone,Sorry I speak French and I use a translator.I am new and I am interested in electronics as an amateur. For a week I bought a Hantek DSO5102P oscilloscope. My firmware version is "3.40.0 (180120.0)". I want to wait a little longer before going to the latest version dated January 25, 2019 because I want to compare with the new update. For now I see some bugs on my DSO5102P and I want to see later if the new firmware will fix these bugs. I would like to know if people on this forum have kept the file of the firmware update of the year 2018, 2017 etc ... I would like to be able to obtain the version I have at the moment to be able to come back back in case of problem by upgrading to 2019.Does anyone have my firmware version "3.40.0 (180120.0)"?Thank you all! :-)

author: tinhead
author_rank: Super Contributor
timestamp: February 24, 2019, 06:19:28 pm
content: https://1drv.ms/f/s!AiY46m4u993EgSg4ZGmBREL7uZRzthen firmware -> hw1.00.0i copied right now "dso5kp_func_dso5072p20180120.up", it should work for you as well

author: gtr
author_rank: Contributor
timestamp: February 24, 2019, 07:55:36 pm
content: Ok thank you very much tinhead for sharing.On the other hand it is version 3.40.0 of 2014 and me of 2018. There have surely been modifications in the last 4 years.If I update for 2019, can I go back with an old version? I watched this videoat 3:35 there is an error message saying that its version is higher than the one it wants to update.Thank you

author: tinhead
author_rank: Super Contributor
timestamp: February 24, 2019, 10:07:06 pm
content: Quote from: gtr on February 24, 2019, 07:55:36 pmno, this is exact the version you asked for, 3.40 from 2018dso5kp_func_dso5072p20180120.upIgnore the other files on OneDrive, take the one from 2018

author: gtr
author_rank: Contributor
timestamp: February 24, 2019, 10:33:43 pm
content: Ok but your version of 2018 is for the DSO5072P and my oscilloscope is the DSO5102P. This is two oscilloscope model have the same firmware?Thank you!
Ordered 2x Aneng 8008's from Banggood - got 2 different meters! - Page 1
Forum section: electronics / testgear

author: Veteran68
author_rank: Frequent Contributor
timestamp: February 24, 2019, 05:50:20 am
content: I wanted another compact meter and decided to snag a couple of Aneng 8008s from Banggood, since by all accounts they're decent little meters for the $16 price (even given the missing 60mV range). I intentionally avoided the 8009 because I don't have a need for NCV and Temp on these meters (I have plenty of other meters), and it's $4 more. But figured I might one day have a use for the 8008's 3.3v square wave generator on the bench. Maybe.Anyway, I got both meters today. Here they are side-by-side. Notice anything odd?It looks like the meter on the left is actually the 8009 with an 8008 badge! I confirmed that it's not just a case swap, it actually has the NCV & Temp functions (though no thermocouple included) instead of the wave generator. Also the cases are orange, not the usual red that I've seen and as shown on the Banggood page.Both seem to work fine from what I've seen. I'm not hung up on it or anything, just found it kinda funny. Anybody else seen this?

author: Specmaster
author_rank: Super Contributor
timestamp: February 24, 2019, 08:32:15 am
content: Quote from: Veteran68 on February 24, 2019, 05:50:20 amComplain about it and they may send you a replacement meter and allow you to keep 8009 as well.
GW Instek GDM 8255A problem - Page 1
Forum section: electronics / testgear

author: Analogdevice
author_rank: Contributor
timestamp: February 15, 2019, 05:10:28 am
content: Hello guys,I'm back here and I have a problem with my GDM8255A. I buy it for 50€ for repair. In the input part there were some chip resistor dead, two zero "resistor" was under the shunt resistor, someone measure HV or something... I don't know, but this is now irrelevant.Take a look on the VFD part. After power up the instrument I hear relay clicking and one beep, but no image on the VFD. On the display board there are two pieces of PT6311 VFD drivers, whitch have digital input marked as DIN. On this pin, there is nothing, still Log 0. It shall be serial communication.This serial line goes to CPLD Lattice iM4A5 256/128 to the I/O pin 38. I measured resistance between this pin and GND and it's 0,82 Ohms when instrument is switched off and 0,06 Ohms when instrument is powered on. No communication, no data. I don't know how it's programmed, is it a problem or it may be normal? I'm guessing that it's ok and this serial line to VFD is dependent of some other input to CPLD. Also the local keyboard is not working; this part also comes thru PT6311.I tried to connect the instrument via RS232 and it communicates. When I send command "*rst" thru RS232, I hear relays and one beep just like at startup, also I can read fw version and all that stuff and I tried to use GDM software to set the measurements and read the display and it works (but thanks to bad input part I have read 10 in every measurement, i.e. 10.000A, 10.000V etc.). When I ask GDM for errors using system commant (syst:err?) it answers me "No error". So the communication is working.Do you have any hints? Or schematic, service manual? The PCB have min. 4 layers including shielding, I can't see the routing.Thanks for any advices!

author: coromonadalix
author_rank: Super Contributor
timestamp: February 15, 2019, 11:27:48 am
content: Never saw any schematics for the gdm-8251, 8255, 8261 series of metersIt would take some reverse job of your side, or maybe find another identical meter to do some comparaisons ??Maybe ask Instek for a service manual under an non disclosure agreement ??

author: Analogdevice
author_rank: Contributor
timestamp: February 23, 2019, 10:30:33 am
content: No wayI texted some messages to goodwill service and they only ask me, why I need it, then no reply.So I have two options:1. F..k that sh**2. Ask someone on EEVBLOG for help using his meter.So first I try second option. Is there someone, who have GDM 825XA meter? I need some voltages and waveforms. THX.
Some serious hard-core low leakage p*rn :) - Page 1
Forum section: electronics / testgear

author: nwvlab
author_rank: Regular Contributor
timestamp: February 21, 2019, 11:59:16 am
content: Hi there!A few years ago I had to send back this E5288A ASU (atto sense and switch unit) to Agilent. 100 aA resolution!This didn't stop me to look what there was insideI recently found again those pictures, I thought that other people would appreciate this hardcore low leakage stuff tooCheersPS: the preview does not show pictures. I hope they are uploaded correctly!

author: jjoonathan
author_rank: Frequent Contributor
timestamp: February 21, 2019, 11:38:13 pm
content: Beautiful!600 electrons per second isn't much, but it still seems like a lot in the face of all this engineering. Squirreley little buggers, aren't they?

author: Vgkid
author_rank: Super Contributor
timestamp: February 22, 2019, 12:02:44 am
content: Very impressive unit.
Isotech idm503 - Page 1
Forum section: electronics / testgear

author: wertyu
author_rank: Contributor
timestamp: February 21, 2019, 11:50:42 am
content: looks a good tool , its got everything im looking for and more tbh , and for an excellent price £65 on ebay UK .But they seem to be bulk selling them off as if the company failed or the product line failed or there s**t .Anyone own one or used one have any input , thanks .

author: retiredcaps
author_rank: Super Contributor
timestamp: February 22, 2019, 12:10:27 am
content: Likely a rebadged APPA 503 tech multimeter.https://www.eevblog.com/forum/testgear/i_m-guilty-(voltcraft-vc950-teardown)/

author: wertyu
author_rank: Contributor
timestamp: February 22, 2019, 12:49:56 pm
content: Thanks RC , it certainly looks very similar . I bought it anyway for £65 i thought worth a try and i am very impressed , very well built it does seem to take a lot longer to read than the fluke i bought that was faulty but nothing the complain about really .it takes about 7 - 10 sec to read a capacitor only 3 for the fluke if that . but only minor issue .also the temp reading is about 5-10 degrees out compared to my other temp tester which i trust but again not really needed on a multimeter .Its also probably a bit too over the top button and display wise i like the simplistic fluke , much easier to operate .Strangely the fluke i bought ( previous post ) seems to be be reading ok now .
Is an old LaCroy LS140 scope a good buy for a cheap digital oscilloscope? - Page 1
Forum section: electronics / testgear

author: hleng-bloodworth
author_rank: Newbie
timestamp: February 19, 2019, 12:38:47 am
content: Hiya all,I was scouring the web for a cheap digital storage oscilloscope when I found a LS140 that was within my budget. Does anyone remember using it, is it a decent scope. I just want to know if its any good before I spend money on it. All input is welcome.Thanks in advance!

author: DaJMasta
author_rank: Super Contributor
timestamp: February 19, 2019, 02:16:29 am
content: Probably not the best choice? Quite large and 200MS/s sample rate, so only just barely gets nyquist for the 100MHz input bandwidth - does including a sampling scope mode for more effective samples on repetitive signals, but it's not great for most general purpose use.What's the price, though? If it's actually a couple hundred bucks ballpark, a modern budget scope or something like the LeCroy LC300 series would be a far better choice. If you're getting it ultra-cheap, then maybe, but I don't think it would really be worth the bench space to me.

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 19, 2019, 03:00:08 am
content: i can see USD280 in ebay. i suggest wait a little bit to add something $100+ to get new Rigol DS1054Z or Siglent alike DSO, much better spec and new. there is risk that old LS140 only live for a short time then you will need to save up again.

author: hleng-bloodworth
author_rank: Newbie
timestamp: February 20, 2019, 02:36:34 pm
content: Its £142 in the UK ($180) so its not too bad.

author: hleng-bloodworth
author_rank: Newbie
timestamp: February 22, 2019, 10:42:21 am
content: Hiya,Thanks for your advice. I followed your advice and got a newer but used scope (Tek TDS1002) for less than the lacroy.
VMA Simple Spectrum Analyser for HP/Agilent 8590 Series (Teaser) - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: February 22, 2019, 11:59:04 am
content: Hi,While I am in process of repairing my two 8594E units, I already stared to make a specific version of my "VMA Simple Spectrum Analyser" software.Attached are two pictures showing the first results.Regards,Vitor
Maynuo M9812 no-load hum, normal? - Page 1
Forum section: electronics / testgear

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: April 02, 2018, 07:52:12 pm
content: I just took delivery of a Maynuo M9812 (cheaper than the M9712 this week). On powering it up, I got quite an audible switching sound/hum. A visual check of the PCB showed nothing amiss and I couldn't pinpoint the source or an offending MSOFET in particular. Both heat sinks were humming when tested with a dowel. Display reading are OK, although the voltage is a bit off which I will recal. After discharging an SLA, the device is now much quieter on no-load, but there is still quiet hum. I've had a similar unit in the past that was quiet until loaded. Is this normal for this model, or should I be testing the drivers/MOSFETS and refastening everything?

author: lbreuss
author_rank: Newbie
timestamp: February 22, 2019, 10:02:41 am
content: Just got a M9710 and it had a terrible humming rattle on the transformer.My bad, I broke the rule, I didn't tear it down before firing it up for the first time! I apologise.So I disassembled the transformer bracket, gave it a few slaps with a hammer, et voila, the humm is gone. Nice and quiet now. In my case, I would say that's OK for the discounted price of the M9710...Before:https://youtu.be/dg0al1XIGhkAfter:https://youtu.be/xZ6jg4lnjkE
R&S FSH6 on ebay looks like scam... - Page 1
Forum section: electronics / testgear

author: kirill_ka
author_rank: Frequent Contributor
timestamp: February 20, 2019, 04:15:34 pm
content: There are two listings from different users:https://www.ebay.com/itm/202600138073https://www.ebay.com/itm/333081040138The listings look somewhat similar. I don't like the pictures.

author: DaJMasta
author_rank: Super Contributor
timestamp: February 20, 2019, 05:48:37 pm
content: $2000+ instrument from a 0 feedback seller is always gonna be a risk. I'd contact them and I wouldn't pay a regular rate because of the risk, also be sure all the Is are dotted and Ts are crossed in payment and such to make sure there aren't any impediments to a potential fraud/return claim.

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 20, 2019, 06:23:53 pm
content: the 2nd seller doesnt ship outside USA so dont dream. always pay with paypal.

author: usagi
author_rank: Frequent Contributor
timestamp: February 21, 2019, 07:01:19 am
content: probably real, I have 5 of them. pictures look legit to me.US sellers may not want to ship overseas due to risks violating ITAR.you could always use an escrow company.

author: kirill_ka
author_rank: Frequent Contributor
timestamp: February 21, 2019, 10:46:41 am
content: There are so many mail forwarding services, so US-only shipping is not an ultimate barrier. However in this situation it's even more risky.I did notice one more thing:"Based in United States, mamo_9324 has been an eBay member sinceJan 16, 2019""Based in United States, laugo-2331 has been an eBay member sinceJan 16, 2019"Is it coincidence?

author: usagi
author_rank: Frequent Contributor
timestamp: February 21, 2019, 11:09:27 am
content: probably not a coincidence. could be a scam, maybe not. escrow would at least help reduce risk.but there are plenty of other FSH6 on ebay to choose from.fwiw i would say a nice loaded up R&S CMU200 is a much more capable device and much better value for money, if you don't need the portabililty or 6ghz.
Siglent SDS1102CML+ Reset lost functions - Page 1
Forum section: electronics / testgear

author: MavMitchell
author_rank: Contributor
timestamp: January 31, 2019, 12:25:42 am
content: Hi,I have a Siglent SDS1102CML+ (actually DIGITECH QC1934) and was getting to know it. I thought it would be a good idea to use the multiple MATH key to do a factory reset(Stupid eh!).It came back ok, but now the system status doesn't show the model number and some other functions are missing(deep memory for example).I have Telnet access to it. Is there a config file or something I can reload to get this back?Thanks.

author: StillTrying
author_rank: Super Contributor
timestamp: January 31, 2019, 01:22:59 am
content: Welcome to the club, I've been trying to fix that for 2 years!Someone from Siglent did once say they were going to release FW with cfg files, but......and they still might not be compatible with your DIGITECH anyway.

author: StillTrying
author_rank: Super Contributor
timestamp: February 24, 2019, 08:37:53 pm
content: Any luck?

author: Muttley Snickers
author_rank: Unknown
timestamp: February 24, 2019, 11:59:06 pm
content: Quote from: MavMitchell on January 31, 2019, 12:25:42 amI almost bought one of these scopes once and was pretty sure that the Jaycar Digitech QC-1934 was a CML and not a CML+ series, the latter incorporated a higher screen resolution of 800 x 480, a LAN connection along with a different firmware version, this could be an issue if you loaded the incorrect firmware version.https://www.siglent.eu/siglent-sds1102cml-plus.htmlhttps://www.siglent.eu/sds1102cml-100mhz.htmlhttps://www.siglent.eu/Downloads

author: StillTrying
author_rank: Super Contributor
timestamp: February 25, 2019, 09:58:00 am
content: Quote from: Muttley Snickers on February 24, 2019, 11:59:06 pmYou're right, according to this ad the QC-1934 is not a +, but nothing would surprise me, the confusion caused to sites and sellers by the + is nearly unlimited.https://www.jaycar.com.au/7-screen-100mhz-dual-channel-dso/p/QC1934
Rohde & Schwarz CS-PSSU - Page 1
Forum section: electronics / testgear

author: maginnovision
author_rank: Super Contributor
timestamp: February 18, 2019, 06:46:52 am
content: I see these all over ebay but I can't find a data sheet, or any mention of them on the R&S site. I bought one because I'm curious and it was less than 100$. Does anybody here know anything about them?

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: February 18, 2019, 02:13:16 pm
content: It is a part of a rf test rack. Take a look at this manual:https://cdn.rohde-schwarz.com/pws/dl_downloads/dl_common_library/dl_manuals/gb_1/t/ts8977/TS8977-System-Manual.pdfThat power supply powers the main switching unit.

author: maginnovision
author_rank: Super Contributor
timestamp: February 21, 2019, 08:58:35 pm
content: Just a quick follow up. About what I expected. Input filter, switching supply with 3 rails and each has its own output filter as well to the circular connectors. I'll cannibalize it and toss the case. Filters are 3x corcom 10eg1 and 1 16fc10.
[CLOSED] Hantek DSO4072C limited bandwidth, - Page 1
Forum section: electronics / testgear

author: MasterT
author_rank: Frequent Contributor
timestamp: January 22, 2019, 01:59:02 am
content: How to "un-roll" firmware back to previous version?

author: Microcheap
author_rank: Frequent Contributor
timestamp: January 22, 2019, 04:08:03 am
content: I could not reproduce this problem, which fw version are you using? The last one is 3.50.0 (181203.0)

author: MasterT
author_rank: Frequent Contributor
timestamp: January 22, 2019, 04:35:59 am
content: Strange, my version 3.50.0 (180305.0)The latest, pack: dso4kc_func_hantek_dso_dso4072c_20180305.0.upIt's still available at official hosting.

author: MasterT
author_rank: Frequent Contributor
timestamp: February 19, 2019, 11:00:13 am
content: To close this thread, I've got an answer from tech support Hantek.There is a "factory default reset" feature, that nulls out all updates/ upgrades of the software, build-in the DSO40XX / DSO50XX software.