hybridfree/eevblog-posts huggingface dataset:
Help with Siglent SDG1025 Ouputting "Pink Noise" - Page 1
Forum section: electronics / testgear

author: Tacheon
author_rank: Newbie
timestamp: April 17, 2015, 06:53:30 pm
content: Greetings EEV'ers and Dave, thanks for all you do down unda.I just purchased a Siglent SDG1025 Func. Gen, and I like everything except the noise feature. I expected it to be "White" noise, and was simply going to run it through a passive filter to convert it to pink noise for audio testing. Unfortunately, I made the wrong assumption, and it turns out the unit outputs Gaussian noise, which doesn't work for me. I contacted the company, and they did attempt to provide me a spread sheet in .CSV format which was supposed to simulate pink noise. I loaded the file, but it seems that there is a sawtooth signal associated with it. I think it just might be number crunching it over and over, at the start point and I am seeing the math, but not sure. I wanted to use easywave software, and try to have the unit crunch an equation from the noise signal that the software provides, but I am not sure how to do that. Might anyone have an idea or work around on how to get this unit to output Pink Noise?Here is a link for the equation:http://en.wikipedia.org/wiki/Pink_noiseAttached is a .CSV file from SiglentHelp?

author: KennP
author_rank: Newbie
timestamp: June 30, 2017, 02:00:27 pm
content: Hi Tacheon,I'm just a Newbie so I don't know if you still need an answer to this question.Anyway, my attempt at a solution was to change the CSV file using a fill down column formula like this;=20*RAND()-10I've attached the modified CSVKennyP

author: coppice
author_rank: Super Contributor
timestamp: June 30, 2017, 03:57:37 pm
content: "I wanted white noise, but I got Gaussian noise" makes no sense. The Gaussian noise will almost certainly be white. If you don't want Gaussian statistics, what are you looking for?

author: KennP
author_rank: Newbie
timestamp: July 01, 2017, 09:09:37 am
content: Doh! (as I slap my forehead). White noise has a flat spectral density, but in pink noise the frequency spectrum falls off as 1/frequency. I forgot to include that factor in my previous response, sorry. In fact the way I attacked the problem was a complete failure (sorry about that too).The maths is too hard for me but interesting; See herehttp://www.firstpr.com.au/dsp/pink-noise/
Simpson 415A - Page 1
Forum section: electronics / testgear

author: neo
author_rank: Super Contributor
timestamp: July 01, 2017, 02:59:02 am
content: Anyone havemuchany information about this unit? I can scarcely find more then a couple of references to it let alone anything to answer questions like. Why are there 2 G modes? How to use second G mode? How to properly use it? Is there anyway to get a replacement probe for the oddball connector on the audio output?
Saving Data on a HP4145B Semiconductor Analyser - Page 1
Forum section: electronics / testgear

author: fourierpwn
author_rank: Regular Contributor
timestamp: June 28, 2017, 05:22:43 am
content: Hi all,I am using a HP4145B to grab some IV data of some mosfets. This equipment has a 3.5" floppy disk which is required to boot up. I have done my measurements, everything looks good but I don't know how I can get the data out of the equipment.I have tried using GPIB but the command reference in the manual is lacking to say the least. Does anyone have experience with talking to this instrument or know of another way I can save the data to a text file?

author: alm
author_rank: Super Contributor
timestamp: June 29, 2017, 01:44:23 pm
content: If the floppy drive is fairly standard, you could consider replacing it with one of the floppy emulators that let you use a USB stick or SD card. This approach has worked in several other HP instruments from that vintage. You may need to make an adapter if the pin-out does not match. Seethis forum thread describing the modification.An alternative way is to try to use the7470 GPIB plotter emulatorto capture the data.Reading through the manual, reading data via GPIB seems quite straight-forward: DO 'foo' should request the data from channel foo. To get started, try doing the setup through the front panel and only execute the DO command through GPIB. Or try the sample programs. Can you elaborate how you think the manual is lacking? Seems like a fairly standard reference manual that assumes you are already familiar with operation of the device and explains how to map each specific action to a GPIB command.

author: fourierpwn
author_rank: Regular Contributor
timestamp: June 30, 2017, 12:19:48 am
content: Thanks for the reply.Quote from: alm on June 29, 2017, 01:44:23 pmI did try to set everything up via the front panel and then run DO command, however the front panel is disabled if you have GPIB connected and once you open the communication link the instrument resets even when *RST has not been sent (this was in Matlab)Because of having to configure the entire setup over GPIB I quickly gave up and promptly blamed it on the manual when it was more likely my lack of understanding that was the problem.I have now got the data off of the equipment.For future reference, there is some software called Win4145 / WinICS which requires a license however they offer a free 30 day trial. This software is designed to communicate with the 4145A/B (and various other SMU's) and it did the job. However, it only works on PC's/laptops that are running Windows 7 or older (XP, 2000 etc)Hope this may help someone in the future
$1 Chinese thermometers? - Page 1
Forum section: electronics / testgear

author: kalel
author_rank: Frequent Contributor
timestamp: June 29, 2017, 07:33:05 pm
content: I'm wondering about what technique these use for their probes:and do they have a place in electronics use.They are about $1 now with free shipping, which definitely makes them as cheap as possible.The data cited is below (some do come with batteries):QuoteWhat it doesn't say is anything about the technology they're using to get the temperature measurements. What's inside of the probe? Is the accuracy an indication? Can they be used to measure some temperatures of e.g. LEDs or resistors similarly to thermocouple probes? Someone might have more information on these.Obviously the 110 C range (if true) is somewhat limiting, but there are many things that could be measured within this range. As for any difference between multiple units, I assume these can be written down and then considered when taking measurements (they are probably difficult to adjust internally).

author: edavid
author_rank: Super Contributor
timestamp: June 29, 2017, 07:44:04 pm
content: thermistorhttp://www.ebay.com/itm/1M-Long-NTC-10k-Thermistor-Temperature-Control-Sensor-Probe-Extension-Cable-WS-/322568175070They work OK, but they are too slow for workbench use.

author: thm_w
author_rank: Super Contributor
timestamp: June 29, 2017, 07:47:24 pm
content: They work well enough for measuring temperature in the house or fridge, etc. to make sure food is safe temperature for example.The one I have here uses a NTC thermistor. Accuracy will get worse as you go to the extremes (>70C etc.)http://www.learningaboutelectronics.com/Articles/Thermistor-resistance.php"Can they be used to measure some temperatures of e.g. LEDs or resistors similarly to thermocouple probes? "With that large metal probe thats going to be too hard, and take a long time to heat up, you want something with a smaller tip.

author: kalel
author_rank: Frequent Contributor
timestamp: June 29, 2017, 07:49:35 pm
content: Got it, a bit slow and a bit difficult to use for electronics due to the size. Thank you both for the useful information.

author: Vtile
author_rank: Super Contributor
timestamp: June 29, 2017, 07:54:12 pm
content: Have you looked up ie. components like LM35 which is easy to use and rather accurate 3-wire temperature sensor. That is if you aren't looking a ready module.

author: kalel
author_rank: Frequent Contributor
timestamp: June 29, 2017, 08:17:47 pm
content: Quote from: Vtile on June 29, 2017, 07:54:12 pmI was considering affordability in integrated modules, but this is something good to know about for any MCU projects. Perhaps it could even be used with a multimeter as it is linear.

author: MosherIV
author_rank: Super Contributor
timestamp: June 29, 2017, 10:45:44 pm
content: You really love cheap tatHave you looked for TM902C thermocouple thermometers, they are available for $4 ?https://www.eevblog.com/forum/testgear/tm902c-quality-and-accuracy/msg1237420/#msg1237420
Potentiostat\Galvanostat\EIS - Page 1
Forum section: electronics / testgear

author: lukasdev
author_rank: Newbie
timestamp: June 29, 2017, 09:14:29 am
content: Hi.Does anyone have damaged equipment "Potentiostat \ Galvanostat \ EIS" from the top shelf such as "Biologic, Ametek, ..." or other ? (For the teardown and reverse engieenring.)

author: Gribo
author_rank: Frequent Contributor
timestamp: June 29, 2017, 07:11:34 pm
content: What sort of sensor are you trying to interface to?

author: lukasdev
author_rank: Newbie
timestamp: June 30, 2017, 06:41:54 am
content: This equipment is used to measure supercapacitors and ionic electrolytes.Based on the schematic obtained I would like to build a similar equipment, but on high voltage.
Rigol MSO1104Z firmware upgrade keeps options? - Page 1
Forum section: electronics / testgear

author: jrmymllr
author_rank: Regular Contributor
timestamp: June 29, 2017, 04:05:07 pm
content: I've found lots of posts regarding this series of scope (and DS1000 series), but couldn't find anything regarding whether options obtained by using JTAG and rigup were maintained after reflashing. My guess is they are maintained since the lack of complaints might mean everything is ok.So, is it safe to apply DS1000Z Firmware_00.04.04.03.02 fromhttp://int.rigol.com/Support/SoftDownload/3, will option codes not obtained from Rigol stay intact?

author: Fungus
author_rank: Super Contributor
timestamp: June 29, 2017, 04:54:40 pm
content: Quote from: jrmymllr on June 29, 2017, 04:05:07 pmIt's certainly true on the DS1054Z, the MSO should be no different (it's the same firmware!).
simlpe circuit that generates 2 pulses at 2 outputs with adjustable delay time? - Page 1
Forum section: electronics / testgear

author: carl_lab
author_rank: Frequent Contributor
timestamp: June 29, 2017, 11:56:42 am
content: Delay time should be about 150ns.I need the circuit to adjust an Agilent 53131A counter (time interval function).I think, absolute accuracy of the delay circuit will not be a problem, because after adjustment of the counter a verification will be made with calibrated instruments.
LCR meter vs Impedance Analyzer - Page 1
Forum section: electronics / testgear

author: electrolust
author_rank: Unknown
timestamp: June 28, 2017, 07:07:09 pm
content: What's the difference? Appears to me to be the same thing, except that an LCR meter is optimized for single point measurements (so perhaps more accurate) whereas the Analyzer is optimized for frequency sweeping (less accurate, but much faster to characterize over the frequencies of interest).

author: metrologist
author_rank: Super Contributor
timestamp: June 28, 2017, 07:15:11 pm
content: It probably depends on which instruments you are comparing. From the hip, I'd say an LCR meter is typically a scalar device and an analyzer is vector.

author: electrolust
author_rank: Unknown
timestamp: June 28, 2017, 07:41:06 pm
content: Comparing something like an HP 4284a vs a 4192a. Not something like a handheld LCR meter, and not an RF impedance analyzer.
HAMEG / ROHDE SCHWARZ HM8123 Counter  Need Calibration Procedure - Page 1
Forum section: electronics / testgear

author: Testtech
author_rank: Regular Contributor
timestamp: June 24, 2017, 09:42:19 pm
content: Greetings,I have a Hameg/Rohde Schwarz model HM8123 Counter, and need the calibration procedure. The internal 10MHz reference is slightly off, and apparently, this can be adjusted from the cal procedure.Does anyone have this?Thanks,Testtech

author: F64098
author_rank: Regular Contributor
timestamp: June 28, 2017, 07:23:24 pm
content: Hello,you have to ask R&S for the password and they will send you the calibration manual.But you will be asked for the serial# of the unit.service@hameg.comBest regardsFrank
Review Siglent SHS-1602 isolated scopemeter - Page 1
Forum section: electronics / testgear

author: PA4TIM
author_rank: Super Contributor
timestamp: June 27, 2017, 07:52:22 pm
content: I have this scope here from Eleshop, they were so kind to give it to me for a few weeks to just play with it. After using it a week I decided to make a you tube review, something I wanted for a longer time and this was a nice chance to do really it. I asked them if it was OK to do a review and a teardown and they had no problem with that.I do not get paid for it, I'm absolute not a fanboy of Chinese gear but I did my best to stay objective. That turned out to be not so difficult because against all odds I start to like this scope. OK, at 1300 incl VAT it is alsonot the bottom of the range.I made a page on my website with photo's and information and 2 youtube videos.Part 1 the reviewpart 2 a demo of using an isolated scope and the teardown.I must say, now I have done this, my admiration for Dave grew. He makes it to look so easy. I made several tutorials and webpages over electronics but this is 10 times as hard. Writing English is more easy as talking to a camara (with no-one in the room).And the editing, pfff, my laptop broke down so now I used a Toshiba Tecra S1 on linux a friend gave me. That is a pentium M with 512MB memory. The whole review took me almost a weekI have a lot to learn about vlogging but it was fun doing it and I hope you like it.The webpage:http://www.pa4tim.nl/?p=5896This is the scope:I do not know how to place a youtube video in the post but here are the links:Part 1:https://youtu.be/R5lTLuclk1MPart 2:https://youtu.be/rNElNKeDNyg
Rigol DSA-1030 spectrum analyzer feature unlocking? - Page 1
Forum section: electronics / testgear

author: Radio_Fan
author_rank: Newbie
timestamp: June 28, 2017, 07:04:29 pm
content: Hello--I'm disappointed to learn that my year-old Rigol DSA-1030A-TG spectrum analyzerhas been discontinued. According to distributors I've contacted, the advanced measurementspackage (AMK-DAS1000) for the analyzer is also no longer available for purchase.Does anyone know whether the feature-liberating Riglol method used on Rigol'sDSOs also applies to their spectrum analyzers (and specifically, the DSA-1030)?Bricking this fine instrument would be **really** upsetting.Thank you in advance for suggestions and comments, and 73--Radio_fan
Uni-T long term - Page 1
Forum section: electronics / testgear

author: jordanp123
author_rank: Regular Contributor
timestamp: June 11, 2017, 12:55:35 am
content: Out of pure curiosity how is everyones Uni-T's meters holding up ? I have a 139C and a 210E (Which is very useful), I've not had any issues insofar but I'm curious how everyone else's equipment is holding up.

author: Electro Detective
author_rank: Super Contributor
timestamp: June 11, 2017, 01:52:05 am
content: What ballpark period is 'long term' ?It also depends on the amount of use or thrashing it gets,how well the selector dial insides and switches hold up with fair to heavy useand if the meter specs and error tolerances are still ok etc

author: jordanp123
author_rank: Regular Contributor
timestamp: June 11, 2017, 02:05:44 am
content: Quote from: Electro Detective on June 11, 2017, 01:52:05 amI agree completely, I'm not looking for a definitive answer, this is more of a general open ended question. Mainly looking for user experiences.

author: MosherIV
author_rank: Super Contributor
timestamp: June 13, 2017, 10:28:34 pm
content: HiMy oldest Uni-t is a Tenma branded UT70B, it is 5-6 years old. It was the best meter I could afford at the time, around £70. Tenma brand is the Farnell own brand, I assumed they rebranded something professional electronics engineers would be happy with.I only use it lightly (occaisionally, ie not daily or even weekly). It is still working perfectly.I got the UT61E just over a year ago. Hardly use it. Modded it by adding the missing MOVs. Still works perfectly.I also got the UT210E. Hardly use it. Still works perfectly.

author: RedSky
author_rank: Contributor
timestamp: June 28, 2017, 12:48:47 pm
content: Uni-T UT70D - had it for over 7 years. Bit of a gamble back then, Uni-T was almost unknown.It's had a LOT of use. Blown a number of fuses over the years, my own fault, leaving the probes plugged into the amperage range while going to measure volts on batteries. It's also been dropped multiple times, knocked hundreds of times, disassembled at least twice by me as well to see how it ticks. Still on the original probes.Recently got one of those Chinese voltage references (2.5v, 5v, 7.5v, 10v) the UT70D's worst reading was within 0.04% of the 'calibration' voltages.It's been an all round great multimeter for hobby use. I understand it has poor protection circuitry, possibly unsafe on high voltages, but it's one of the few meters in the price range that can read down to 1 microvolt on the 80mV range (80,000 count)I'd nearly buy another one as can now be had for $140AUD new delivered on Aliexpress and having two accurate meters is always better than one, but going to try a Brymen BM867s next I think due to the great reviews and a birthday coming up.
Please help me with this DDs function generator module!! - Page 1
Forum section: electronics / testgear

author: kgavionics
author_rank: Regular Contributor
timestamp: June 26, 2017, 03:57:31 am
content: hi guysI bought this small function generator module based on ICL8038 circuit from ebay, but i didn't receive any instruction how to use it.I searched on internet ,but no luck.My problem i can't get any sinwave output.there are three output pins:1-SIN/TRG ( common output shared between sin and triangle wave)2-SQR3-GROUNDi have the triangle and the square wave, but i don't know how to switch to the sin wave output.can someone help me with that please?thanks in advance

author: MarkF
author_rank: Super Contributor
timestamp: June 26, 2017, 04:42:01 am
content: I found this circuit diagramhere.Did you try the switch? It appears to toggle between sin and tri output on the diagram.

author: kgavionics
author_rank: Regular Contributor
timestamp: June 26, 2017, 06:17:12 am
content: thank MarkF for the diagram.yes indeed i tried the button,but i get a shape like a triangle wave with a lower amplitude (see attachment), it's not a sin wave at all .it played with all the pots and jumpers, but no luck .weird problem

author: Kleinstein
author_rank: Super Contributor
timestamp: June 26, 2017, 04:47:01 pm
content: The sine waveform usually needs adjustment. With so many pots, one usually should follow some system with adjusting. The data-sheet for the ICL8038 should be a good start to look at. The first is having a nice symmetric triangle - it looks like the duty cycle is already OK. Than there are still two more pots for the sine adjustment.

author: kgavionics
author_rank: Regular Contributor
timestamp: June 27, 2017, 03:06:09 am
content: i tried all the pots with the same result.i gave up on this crappy product.thanks guys for your help anyways

author: Kleinstein
author_rank: Super Contributor
timestamp: June 27, 2017, 05:15:36 pm
content: It looks like they screwed up the sine waveform adjustment. Compared to the circuit in the datasheet they seem to have swapped the pot and fixed resistor for the Adjustment at pin 1.It looks way worse than with no adjustment. So it might be worth a try and disconnect pin 1. One might remove the pin from the socket or unsolder the pot used for Pin 1.Just in case the trouble is with the amplifier or switch: the sine signal should be at pin 2 of the ICL8038 and the triangle at pin 3.
HP/Harrison 6438B DC Power Supply, service manual - Page 1
Forum section: electronics / testgear

author: valvedoctor
author_rank: Contributor
timestamp: June 27, 2017, 02:04:42 pm
content: Hi All,I have an old HP 6438B DC Power Supply, great bit of kit, but it has excessive noise and some of those old caps have to go. All carbon composition resistors as well that are drifted.I didn't want to shotgun this one, I'm looking for the manual, with no luck on google, except for a partial one with no schematic, no good.....Does anybody have a scan they can hook me up with?Thanks in advance,ValveDoctor

author: alm
author_rank: Super Contributor
timestamp: June 27, 2017, 02:10:31 pm
content: If you can not find a free scan:http://artekmanuals.com/manuals/hp-manuals/
DSOX Colorblind Hack (why is it so hard to let the user choose the colors?) - Page 1
Forum section: electronics / testgear

author: eb4eqa
author_rank: Regular Contributor
timestamp: June 25, 2017, 06:52:10 pm
content: Hi all,Many times discussed here, newer oscilloscopes (and other instruments) do not allow the user to select colors. On top of that, many times green, yellow and orange are the preferred colors, which gives us colorblinds a hard time...As suggested by mikeselectricstuff, I went and did the hack to the DSO-X 3032A. I added blue backlight to the CH1 LED toohttp://www.rbarrios.com/projects/dsox/Regards,Roberto EB4EQA

author: plesa
author_rank: Frequent Contributor
timestamp: June 25, 2017, 07:04:07 pm
content: Congratz to hack and thanks for sharing. BTW did you tried to contact Keysight? It looks like nice marketing opportunity to add this feature.

author: Amazing
author_rank: Regular Contributor
timestamp: June 25, 2017, 07:22:04 pm
content: Very creative solution, thanks for bringing it up.I have the same problem, but my scope is still in warranty so I'm not going to mess with it.Keysight, please do something about this. The first two channels are indistinguishable for people with most common type of colorblindness.EDIT: I don't care if the channel button LEDs don't match.

author: nctnico
author_rank: Super Contributor
timestamp: June 25, 2017, 07:30:04 pm
content: A very useful hack!I hope this inspires Keysight to address this issue because a significant amount of their users are color blind.

author: TheSteve
author_rank: Unknown
timestamp: June 25, 2017, 09:42:32 pm
content: I can totally understand why you'd want such a change if colorblind.I don't see Keysight implementing this on any of the current scopes - but adding it to future scopes should not be a problem. While a software update could change the trace color they can't change the channel indicator LEDs on the face with current models to match.You have old firmware installed based on the Agilent bootscreen. I would recommend updating to the newest build as it helps prevent non-booting from flash corruption.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: June 26, 2017, 05:53:33 pm
content: Dang! That's super neat. I've also passed the feedback along to the team. Although, the rumor is that you just changed it to make the logo Keysight red.BTW, definitely update your firmware.

author: bitseeker
author_rank: Super Contributor
timestamp: June 27, 2017, 12:35:46 am
content: Great job wiring up that adapter, Roberto, and I'm glad you did the blue LED for the button, too. It just wouldn't be complete otherwise.

author: electrolust
author_rank: Unknown
timestamp: June 30, 2017, 12:57:53 am
content: Good stuff! I cannot see the diff between ch1 and ch2 either. I have a 4ch and usually use 2-3 channels. Only once have I used 4ch so far. So now I've taken to just using ch2 and ch3 as my go-to channels.

author: electrolust
author_rank: Unknown
timestamp: June 30, 2017, 12:59:42 am
content: Roberto, I especially love the pics of your lab!! But I haven't quite decided if that's a miniature staircase or if you have extra-large equipment.
run scope in vehicle - Page 1
Forum section: electronics / testgear

author: Jbates58
author_rank: Regular Contributor
timestamp: June 26, 2017, 06:58:15 am
content: hi alljust want to check if there is an issues running my ds1054Z in me vehicle off an inverter? i have to take some measurements while the car is in motion, and i am unable to find a wireless extention lead anywhere....my plan is to plug it into my inverter, and take the measurements whilst its moving.just wanted to check as i dont know. its a Modified sine inverter if that matters, but i think they are a SMPS, so it should be fine shouldnt it?Jason

author: JPortici
author_rank: Super Contributor
timestamp: June 26, 2017, 07:15:01 am
content: Shoukd work, i think the scope should even start off 48V DC (four batteries in series)

author: Yokogawa TM UK
author_rank: Contributor
timestamp: June 26, 2017, 07:33:30 am
content: Be wary of noise from the inverter and the proximity to the scope.There's always the DL350 which is battery powered - maybe worth a look:www.dl350.co.ukLee

author: Fungus
author_rank: Super Contributor
timestamp: June 26, 2017, 07:56:21 am
content: It'll run, no problem.Use a separate battery though, don't run the inverter from the car's alternator. Not if you care about noise.Quote from: JPortici on June 26, 2017, 07:15:01 amEven better if you can do it!Lots of people have reported running the DS1054Z with 48V DC.(switch mode power supplies can do that)
DS1054Z Ultra Sigma USB-TMC not finding - Page 1
Forum section: electronics / testgear

author: Stretto
author_rank: Newbie
timestamp: June 24, 2017, 03:11:06 am
content: Hi, I just bought a new DS1054Z a few days ago and the first thing I did was unlock it using the methods online that generate a serial to unlock all the features. The scope seems to work find but I have not put it through any real tests(calibrate the probes, simple tests, etc).I installed the software as I'm more of a software oriented person. I installed Ultra Sigma and the various apps for it found on the rigol site. I plugged in the USB cable from the PC(a high new PC) and made sure computer was chosen from the IO/USB settings on the scope.Ultra Sigma never finds the scope. I've rebooted several times, etc but it never finds it. I've installed the IVI driver etc. I will attempt to uninstall everything tomorrow and start fresh, and possibly try the lan method to see if that works(But I don't wanna use that as it isn't conducive to my setup).Hopefully someone knows something that might work? It seems like it's suppose to be something relatively straight forward, but it's not.

author: JohnPen
author_rank: Regular Contributor
timestamp: June 24, 2017, 04:28:43 pm
content: Hi,I have had the same problem recently after a long gap. Originally it worked fine last year but now it doesn't. It still worked OK via LAN but didn't work on USB. After a fair bit of digging round it seems to be a missing driver perhaps Win10 removed it or maybe an update. Searching for a driver update on the internet Win10 cannot find one. Now the solution below:You need to reload NIVISA Runtime. It can be found on the Batronix website.http://www.batronix.com/shop/downloads/index.html#RigolThe link is highlighted under the Ultra Sigma Software heading.Download it and install it. Be warned in my case it suggested a 'restart' on completion. This resulted in my machine throwing up a blue screen saying error and collecting info which on reaching 100% it then stuck there. No response to anything so I had to power down by pulling the plug out.On rebooting everything came up OK and Ultra Sigma now see's my unlocked DS1054Z as it used to. Hopefully this will solve your problem as well.John

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: June 24, 2017, 10:16:04 pm
content: I would also suggest trying different usb cables. First time I hooked my Rigol scope to my computer through USB, the computer recognized it and auto installed drivers for it, but thats all I could get it to do. UltraSigma and any other program I tried would not talk to it. Finally discovered that it was a crappy USB cable that I had used because it was the longest I had (and had bought very cheaply). I tried using another cable and it worked with no issues.
Hp 8753D Error message - Page 1
Forum section: electronics / testgear

author: MikeLogix
author_rank: Contributor
timestamp: June 26, 2017, 04:52:18 am
content: At work we have an 8753D that gives a Caution message. Something like, Caution Probe power. In red lettering. I think it has to do with an unused option that allows for a probe to be used. Not currently using this option, is there a way to turn off this message as it makes our printouts look bad?Thanks

author: hendorog
author_rank: Super Contributor
timestamp: June 26, 2017, 05:19:22 am
content: That will be the power for the probe power outlets on the front panel.Which is probably caused by a blown fuse on the top of the A8 post-regulator board.https://sk3ga.se/wp-content/uploads/2015/01/HP8753D-Service-guide.pdfPage 5-11Probe troubleshooting on 5-16 - check for shorts

author: MikeLogix
author_rank: Contributor
timestamp: June 26, 2017, 07:12:52 am
content: Hello and thanks for the reply. Repairing the thing is not an option as I am not allowed to do such things. It is classified as calibration not required as it is used for training. So what I was hoping for is a way to disable the reported caution note as it clutters up the screen.

author: hendorog
author_rank: Super Contributor
timestamp: June 26, 2017, 07:47:10 am
content: Ah I see. Bugger. I don't know if that can be disabled.FWIW it would be a simple repair, but assuming it is a fuse then soldering is required to remove the fuse and put in a new one. (Its almost certain to be the same regulator board as the one in my 8753C which had the same fault). The fuses are visible with the top cover off.
Rigol question: Does anyone know if the LH1116 will work on DS/MSO1000Z's? - Page 1
Forum section: electronics / testgear

author: rankink
author_rank: Newbie
timestamp: June 26, 2017, 06:29:37 am
content: I know that the Rigol LH1116 was sold alongside scopes like the DS1102D, but I am curious if anyone knows if there is a difference between it and the product included with the RPL1116 kit.I've seen product teardown videos to understand that there is a bit of circuitry inside the scope, as well as a small amount inside the case of the LH1116 so I didn't know if they might be the same and thus be capable of being repurposed on the newer oscilloscope product line (such as the MSO1074Z or MSO1104Z).Thanks!
Measuring changing frequency and PWM as waveform(scope) - Page 1
Forum section: electronics / testgear

author: loshampus
author_rank: Newbie
timestamp: June 26, 2017, 04:39:25 pm
content: Hi!I am looking to buy a scope (usb) for automotive repair use. The problem is that new automotive airflow meters use changing frequency or Pulse width modulated output signal.I know that Picoscope software can display changing frequency as its own waveform, are there any cheaper manufacturers that have that same function?(looking for under 300$ usb scope)i am currently using an hantek 1008 and were unable to find this kind of function in the hantek software.Thanks.

author: nctnico
author_rank: Super Contributor
timestamp: June 26, 2017, 10:16:33 pm
content: Look for input filtering. This can turn PWM into a 'regular' signal.
Rigol Electronic Loads - Page 1
Forum section: electronics / testgear

author: LabSpokane
author_rank: Super Contributor
timestamp: June 22, 2017, 04:31:05 pm
content: http://www.tequipment.net/Rigol/DL3021/Electronic-Loads/?utm_medium=email&utm_campaign=Rigol%20DL3000%20DC%20Electronic%20Loads%20-%20622&utm_content=Rigol%20DL3000%20DC%20Electronic%20Loads%20-%20622+CID_4993a783989bcc1be2aceb763e7949d4&utm_source=Campaign%20Monitor&utm_term=BUY%20NOWHas anyone got their hands on one yet? Impressions?

author: Avacee
author_rank: Unknown
timestamp: June 22, 2017, 04:40:24 pm
content: There are some first impressions within this thread:https://www.eevblog.com/forum/testgear/new-rigol-dc-load-d3000-series/

author: rx8pilot
author_rank: Super Contributor
timestamp: June 22, 2017, 05:09:33 pm
content: Curious about these. About 18 months ago, I purchased a modular Chroma DC load system with 8 channels. It was about $1200 or so. The same 8ch with these would be vastly more expensive and probably not any better.......Sent from my horrible mobile....

author: LabSpokane
author_rank: Super Contributor
timestamp: June 22, 2017, 06:41:16 pm
content: The bottom end Rigol could be very interesting if it doesn't have fatal flaws like the first gen power supplies. Anything above that isn't worth considering.Slew rate for the bottom end Rigol is 1/4 (2.5A/us versus 10A/us) that of a Kikusui and price is 1/5th of a 200W Kik. I fell for the marketing blah blah but the data sheet is less impressive.I might consider one instead of an Array, but Kikusui is safe on the high end.

author: rx8pilot
author_rank: Super Contributor
timestamp: June 22, 2017, 08:48:11 pm
content: 2.5A/us is slow. :-(Sent from my horrible mobile....

author: Mechatrommer
author_rank: Super Contributor
timestamp: June 22, 2017, 09:56:21 pm
content: that thing can be easily built. 1-2A/us per power element is not far from hobbiest reality... building CV/CL homebrew PSU just like everybody here keen of doing, is more difficult...

author: LabSpokane
author_rank: Super Contributor
timestamp: June 22, 2017, 10:33:52 pm
content: Quote from: Mechatrommer on June 22, 2017, 09:56:21 pmI'm enquiring out of being more interested in buying a tool than another project. I've only driven an older Kikusui, so I have no idea how well the new programmable ones would stack up to the Rigol's programmability. The slow slew rate isn't a show stopper for me necessarily, particularly if its $500, run and done.

author: 2N3055
author_rank: Super Contributor
timestamp: June 23, 2017, 10:20:30 am
content: 2.5 A/us is plenty fast for general purpose use... For really fast pulse testing, you need to pay much more or spin your own... But I don't need that stuff most of the time.When testing batteries, no need to be very fast... And electronic load is to me most useful for thermal testing and such... Pulse testing for stability is just a small part of it's use..
When and why are 4 wire cables useful for measurement, apart from power supplies - Page 1
Forum section: electronics / testgear

author: cdev
author_rank: Super Contributor
timestamp: June 25, 2017, 08:47:52 pm
content: Can anybody explain this in a few words or point me to a resource that lays it out? I'm particularly curious about what the scenarios where the four wire measurement would make a significant difference in the measurement, that isnt accounted for by something like a "relative" zeroing function.. . I'm familiar with how voltage drop in a cable can and does make a big difference.. I guess thats the situation I am most familiar with, especially when cables are undersized for the load.lets say with tuned circuits.. would the ability to do four wire measurement help me learn what makes a coil or capacitor appropriate for a specific application (to have high Q?)(getting rid of losses in a tuned circuit to increase its Q) - I already have a multimeter with a adequate amount of resolution for 95% of what I do but its not so great for measuring really low resistance.I can see now how different surfaces behave a lot differently in terms of resistance measurement repeatability, Would four wire measurement help there? Why? This is just one of those dumb things that I find myself wondering about a fair amount that I haven't found a really good explanation for anywhere.Thank you!

author: MosherIV
author_rank: Super Contributor
timestamp: June 25, 2017, 09:46:53 pm
content: HiJust like 4 wire for psu, for meaurement it reduces or removes the effects of the measurement leads.It makes a huge difference when meauring very low or very high value resistors.It also makes a difference for L or C, cancels out lead impeadance.Hope that is simple enough for you and helps.

author: TimFox
author_rank: Super Contributor
timestamp: June 25, 2017, 10:04:31 pm
content: Yes, 4-wire connection is best for low resistance values, but of little value for very high resistance.

author: ruairi
author_rank: Frequent Contributor
timestamp: June 26, 2017, 01:45:12 am
content: It bears repeating that if you are thinking of buying a set of 4 wire leads that Franky's kit is excellent and great value, mine has been in almost daily use since i built it 3 months ago.
RIGOL DSA815 with external reference issue. - Page 1
Forum section: electronics / testgear

author: outremer
author_rank: Contributor
timestamp: June 22, 2017, 01:30:45 pm
content: Hi all !I noticed an issue with my DSA815-TG spectrum analyser when I use an external 10 MHz reference. When looking at a signal with a narrow span of (say 20 kHz) I notice a trash response like "sidebands" about 10 kHz away from the signal. These are about 35 dB down from the signal itself. After 10-15 minutes of warmup the spurs disappear after a brief increase and the signal is then displayed normally.I thought first that my GPSDO reference was the culprit due to the oven heating in the OCXO... So I tried several other 10 MHz references but the issue was still the same. As soon as the external reference is disconnected the display becomes clean. After the "warmup" connecting or disconnecting the ext reference causes no change...I also tried several signal sources with no change. The issue is the same from "0" to 1.5 GHz.So the conclusion is that the DSA815 has a trouble trying to lock on the external reference during warm up.I noticed that when room temperature is higher (air conditionning off) the issue clears faster.Has anyone noticed the same issue on his DSA815 ?See the attached pics (note : just before normal I caught the picture a little too late as the issue cleared just before the peak of the signal was displayed)
Another source for Test Equipment repair parts  HP / AGILENT / TEKTRONIX / FLUKE - Page 1
Forum section: electronics / testgear

author: cycle_collector
author_rank: Regular Contributor
timestamp: June 21, 2017, 04:47:22 pm
content: I have 1000's of new HP / AGILENT / TEKTRONIX / FLUKE repair parts and misc electronic parts available to fix your test equipment.See my listing of parts over in the BUY/SELL/WANTED forum:https://www.eevblog.com/forum/buysellwanted/fs-new-test-equipment-repair-parts-hp-agilent-tektronix-fluke-etc/
Hack a louder piezo continuity buzzer - Fluke 117 - Page 1
Forum section: electronics / testgear

author: handyguy
author_rank: Newbie
timestamp: June 23, 2017, 08:18:19 pm
content: As the buzzer in the 117 in nearly inaudible, I did a hack (probably invalidated the high voltage safety rating, though). I took an old piezo element and hooked it in parallel to the existing buzzer. Pull the cap off the existing buzzer, tuck the wires under the contacts, squeeze the element and plastic cap back on, string the wires through to the battery compartment. Can be undone and back to vanilla in 1 minute.Cheers.
Kikusui PMX-A Series Power Supplies? - Page 1
Forum section: electronics / testgear

author: colorado.rob
author_rank: Frequent Contributor
timestamp: June 19, 2017, 12:54:09 am
content: One of the programmable bench power supplies I was looking at before settling on the TTi MX100TP was theKikusui PMX-A Series. They have a lot of features I was interested in, including LXI and current sense on the front. They caught my eye because they were available on Amazon in the US, and the price seemed reasonable for the models I was looking at. However, there wasn't much information about these power supplies from users on forums such as this one.Does anyone have any first hand knowledge about these power supplies that they'd care to share? They don't seem to do a really good job marketing themselves in the US.Edit:Fixed link

author: xrunner
author_rank: Super Contributor
timestamp: June 19, 2017, 12:58:09 am
content: Your link didn't work in your post -http://www.kikusui.co.jp/en/product/detail.php?IdFamily=0130

author: colorado.rob
author_rank: Frequent Contributor
timestamp: June 19, 2017, 01:22:16 am
content: Quote from: xrunner on June 19, 2017, 12:58:09 amThanks. Fixed.

author: SigInt888
author_rank: Newbie
timestamp: June 19, 2017, 07:53:18 am
content: great instruments - I found that the distributor in the UK was very helpful
high POI reciever that has bandwidth appropriate for HP70000 - Page 1
Forum section: electronics / testgear

author: CopperCone
author_rank: Super Contributor
timestamp: June 18, 2017, 04:41:06 pm
content: I am looking to use my hp70000 as a SDR receiver. What are some affordable options that will have a high POI when plugged into the IF output ports?
Strange bootup rigol 1022u - Page 1
Forum section: electronics / testgear

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: June 16, 2017, 06:51:10 pm
content: HelloI have taked a rigol 1022u and it arribed with the handle broked..all seems to works correctly, but when I power on the item it show some vertical and orizzontal strips, and when it power on completely the strips disappear, but if I look with attenction at the screen I can see these strips, is a shade, no burned pixel

author: colorado.rob
author_rank: Frequent Contributor
timestamp: June 16, 2017, 07:15:19 pm
content: I would guess that there is a problem with a ribbon cable connecting the display to the control board. Does it look like it has been disassembled before? Post a picture if you can.

author: mcinque
author_rank: Unknown
timestamp: June 16, 2017, 07:46:13 pm
content: It's normal, all that units have that lines, it's because they power the display before initializing the controller.Me too thought was a defect.https://www.eevblog.com/forum/testgear/rigol-dg1022-bad-lcd-engineered-owners-leave-your-hopinion/msg269550/#msg269550Edit: also, the lcd used for the 1022 is a bit crappy and you'll see strange lines also with high luminosity settings. You should deal with it.
Question on GW Instek Function Generator GFG-8219A - Page 1
Forum section: electronics / testgear

author: mikepa
author_rank: Contributor
timestamp: June 19, 2017, 02:32:21 pm
content: I picked up a GW Instek Function Generator GFG-8219A on eBay. I have a question about the frequency adjust control that seems to have a much wider range than is stated in the manual - for instance on the 1K range the frequency is adjustable from 10Hz to 3.2KHz whereas the manual says it should be 300Hz to 3 KHz. dIts tricky (impossible) setting an exact frequency such as 1Khz and this extra range down to 10Hz doesn't help.So my question, is this extended range normal for the 8219A?

author: doktori
author_rank: Newbie
timestamp: June 20, 2017, 02:06:35 pm
content: Hi - just tested mineRange 30KHz to 300KHzActual 1KHz to 318KHzHowever if you set the frequency to less than the range lower limit, stability suffers.I agree that the frequency adjustment requires a " safecracker's touch "

author: billfernandez
author_rank: Regular Contributor
timestamp: June 20, 2017, 04:59:12 pm
content: Mikepa: I just tested mine and got the same results as you: 10Hz to 3.2kHz on the 1K range. And yes, setting an exact frequency is nearly impossible.
High DC rated AC voltage sensor - Page 1
Forum section: electronics / testgear

author: endevor100
author_rank: Contributor
timestamp: June 16, 2017, 04:40:48 am
content: I need some suggestions for a voltage sensor. I would like to monitor the AC ripple on the DC bus of some industrial VFDs. The DC bus voltage is normally around 600V but can get as high as 900V depending on what the motors are doing. I'd like to be able the AC ripple on the bus down to 1V RMS. Because of the high DC voltage it seems the sensor would have to be rated for at least 1kV and it would certainly make the powers at be happier if it carried a UL or similar safety rating. There are several motor control cabinets spread around the facility so ideally I would like to have a sensor in each cabinet sending their readings over a hard wire (ethernet, RS-485, or whatever) to a central data logging computer. Anyone have any ideas or suggestions?
Extech Clamp Meter Recall: EX650, EX655, MA160, MA61, MA63 - Page 1
Forum section: electronics / testgear

author: MatteoX
author_rank: Regular Contributor
timestamp: June 15, 2017, 01:55:45 am
content: Extech has issued a recall of EX650, EX655, MA160, MA61, MA63 series clamp meters made in 2017.http://www.extech.com/display/?id=16536"This recall stems from consumer reports that the clamp meter’s input terminal screws are loosening. The loosened screws can create an open circuit at the test lead input jack of the meter, causing the meters to give inaccurate voltage readings. An incorrect reading can cause the user to falsely believe that the electrical power of the test subject is low or off, in turn, posing an electrocution hazard."...."The affected clamp meters units were sold during the period of January 2016 to April 2017, and were distributed under the Extech brand. The following model numbers are affected by the recall: EX650, EX655, MA160, MA61, MA63. Serial numbers in the following format are included in the recall: R15XXXXXXX to R17XXXXXXX."

author: JoeO
author_rank: Frequent Contributor
timestamp: June 15, 2017, 09:14:05 am
content: https://www.eevblog.com/forum/testgear/extech-digital-clamp-meters-recalled-ex650-ex655-ma160-ma61-ma63-us-can/msg1219183/#msg1219183Already noted.
2017 may, hack Rigol DS2072a-S Is it possible to unlock? - Page 1
Forum section: electronics / testgear

author: ALeX_71
author_rank: Newbie
timestamp: May 11, 2017, 09:15:59 pm
content: Hello!I wondered, is it possible to hack the DS2072A-S?I'm choosing between 2 models DS2072A-S DS2072A.DS2072A can hack for me, the seller. And about the DS2072A-S says they can't be hacked!I found a method of breaking through RigolBildschirmkopi and rigup-0.4.2. (https://www.eevblog.com/forum/testgear/unlockinghacking-the-rigol-ds2000a-series-scope-the-short-post/100/) Does anyone have some experience hacking DS2072a-S?Help me, can someone make a dump of the firmware? Me a chance to practice working with programs hacking.PS: is there any difference in hacking DS2072A, DS2072A-S, MSO2072A? Is there a difference in the type of firmware for these devices?

author: thm_w
author_rank: Super Contributor
timestamp: May 11, 2017, 09:34:29 pm
content: https://www.eevblog.com/forum/testgear/any-rigol-ds2072a-s-user/msg388119/#msg388119

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 11, 2017, 11:41:58 pm
content: The only difference between the DS2072A and DS2072A-S is the -S version has the built in function generator. Other than that the hardwares are identical, they use the same exact firmware, the hack is the same for both. I have a DS2072A-S (yes it is hackable, seller doesn't know what he talking about), however I would recommend getting the one without the builtin generator because the builtin generator is a pain to control. Unless you just don't have the space for a separate standalone generator, don't waste your money on that option.Edit: Wanted to add, don't pay extra for the seller to hack it for you. Its literally a 5 - 10 minute process that you can easily do yourself.

author: tkarlmann
author_rank: Newbie
timestamp: June 14, 2017, 03:09:55 am
content: Quote from: CustomEngineerer on May 11, 2017, 11:41:58 pmCan you elaborate on the "pain to control" aspect of the DS2072A-S?

author: nugglix
author_rank: Regular Contributor
timestamp: June 14, 2017, 06:42:09 am
content: See there:https://www.eevblog.com/forum/beginners/how-much-abuse-can-a-function-generator-on-a-dso-withstand/msg1164461/#msg1164461These included F-gens are not worth the money, imho.