hybridfree/eevblog-posts huggingface dataset:
Siglent SDS 1000 series dso linux support - Page 1
Forum section: electronics / testgear

author: markmerz
author_rank: Newbie
timestamp: September 30, 2015, 06:22:45 pm
content: Hi!I bought a Siglent SDS 1102CML scope recently and looked for linux utilities from internet. There were few but none of then really worked at all. So I wrote my own set of command line programs that actually worked. Turned out that I didn't used them very often except for one use case – looking at the signal spectrum. As using command line tools for downloading wave from scope, calculating spectrum and displaying it (I used Rstudio for that) is messy, so I decided to write graphical tool for that. I got it somewhat working as today, so if You own the scope and use linux then take a look and give feedback.Software is so fresh out of oven that You should take usual precautions like keep Your pets leashed and kids at safe distance when trying it out. Also it takes some amount of software development skills to get it even compile. Decent packaging to rpm's and deb's follows somewhat later.https://github.com/markmerz/siglscope

author: tautech
author_rank: Super Contributor
timestamp: September 30, 2015, 07:07:44 pm
content: Welcome to the forum.Thanks for offering your work for others to use, no doubt Linux users will be grateful.

author: johansen
author_rank: Super Contributor
timestamp: October 01, 2015, 01:28:37 am
content: Do you think you could write a utility to calculate watts, multiplying channel 1 and 2?The siglent math function will multiply them of course but you have to take a screen shot and then measure the area under the math waveform, because the oscope isn't able to tell you the rms, average, peak to peak, etc, of the math waveforms. these utilities are only available for channel 1 and 2also the on board utilities to calculate rms are only accurate to about 1.5%, and if the waveform is off the display the numbers are not at all accurate, i know its only 8 bits but it seems to me it should be trivial to get a more accurate number. also the display is not 256 pixels high so i know information is being lost before the data gets written to the display.it seems the math utilities are using the data written to the display, not the raw data from the capture as well, but this is a separate mess that has probably already been discussed.

author: markmerz
author_rank: Newbie
timestamp: October 01, 2015, 03:52:06 pm
content: You mean something like this?Code:#!/usr/bin/Rscriptsystem("usbtmc_command -c stop")system("accwave_siglentsds1000 --channel=1 > /tmp/ch1.csv")system("accwave_siglentsds1000 --channel=2 > /tmp/ch2.csv")wave1 <- read.csv("/tmp/ch1.csv",sep = ";")wave2 <- read.csv("/tmp/ch2.csv",sep = ";")multiplied <- data.frame(t=wave1["t.s."], m=wave1["U.V."] * wave2["U.V."])png(filename = "/tmp/multiplied.png", width = 1575, height = 768, units = "px")plot(multiplied, type="l")dev.off()system("eog /tmp/multiplied.png&")
Trigger and record question - DS2072A Scope - Page 1
Forum section: electronics / testgear

author: MattFL
author_rank: Contributor
timestamp: September 23, 2015, 12:03:11 pm
content: Please help me figure out how to record this signal, I'm missing something that seems like it should be simple but I'm not sure what I'm looking for.I'm using a Rigol DS2072A scope and it's got a cool feature where it only records when it thinks something is happening with the signal, so that memory isn't wasted by dead spots. I need to turn this off, the dead spots are important to me, but I don't know what setting I'm looking for.Example case; the startup of a 12V DC power supply. The signal starts at 0V, jumps to 12V in a couple ms, then has some noise around 12V. I need to record about 2 seconds of this entire sequence. With the scope set to rising edge, DC coupling and the trigger level around 1V, I get a very nice recording of when the voltage is transitioning from 0V to 12V, but once it's at 12V the recording stops. How can I make it trigger on the rising voltage, but then keep recording even when it appears to the scope that nothing significant is happening? Did I explain this clearly?

author: H.O
author_rank: Frequent Contributor
timestamp: September 23, 2015, 12:17:00 pm
content: The waveform record and playback feature grabs one "frame" or waveform per trigger event. It's used for the situation where there IS a lot of non intersting "stuff" in between trigger events.That's not what you want in this case. Instead, move the trigger position towards the left side of the screen (so you don't waste half the screen displaying pre-trigger data) then set your timebase to 200ms or 500ms per division.

author: idpromnut
author_rank: Unknown
timestamp: September 23, 2015, 01:13:47 pm
content: To expand on H.O, to be able to grabe 2+ seconds of data including the "dead spots", you are going to need to enable the full memory, and then see the sweep (horizontal) speed to 2+ sec. Then if you single-shot on what ever trigger event at the beginning of the sequence you are looking for (or simply let it run in free-running mode and then stop the sweep), you will get 2+ secs of data in your capture and you can zoom in and look at the waveform. But beware: if you need to look at a chunk of data over a few seconds, samples/sec will drop so you might miss out on details when you zoom into the waveform (for example, if there is a 5nsec event, you probably don't have enough memory to capture this event when capturing a 10second waveform).

author: MattFL
author_rank: Contributor
timestamp: September 23, 2015, 01:26:27 pm
content: Thanks for the replies! I will give this a shot and report back.

author: MattFL
author_rank: Contributor
timestamp: September 30, 2015, 01:14:36 pm
content: Thanks again for the tips, I think this will work. I only have the record function up to 100ms / division, any longer than that and the record function is unavailable. But that should be good enough for now. Maybe I can get enough data in one frame with the single shot setting. Now if I can just get the trigger to be consistent!
Rigol DSA815-TG - Page 1
Forum section: electronics / testgear

author: jhall
author_rank: Newbie
timestamp: October 03, 2015, 09:36:44 pm
content: Hi,I noticed that the DSA815's seem to be discontinued. Does anyone know what is going to replace it? I'm trying to decide if I should go for an 815 on clearance or hold out for whatever is coming next. I'm not a professional just a ham radio guy that like to work on equipment.Thanks for any advice.Jon

author: georges80
author_rank: Frequent Contributor
timestamp: October 03, 2015, 09:53:23 pm
content: Discontinued??? Why do you say that?cheers,george.

author: jhall
author_rank: Newbie
timestamp: October 03, 2015, 09:57:23 pm
content: Well, I saw this ad which made me suspicious.https://www.eevblog.com/forum/buysellwanted/fs-(uk-eu)-rigol-dsa815-1-5-ghz-spectrum-analyser-clearance-stock/I assumed that if dealers were clearing new items they were discontinued. Perhaps a bad assumption on my part.Jon

author: georges80
author_rank: Frequent Contributor
timestamp: October 03, 2015, 09:58:55 pm
content: Even the US Rigol site has various 'clearance' items. Typically returns or repairs etc that can't be sold as 'new'.cheers,george.
75ohm RG59, for psu testing with scope? - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: September 29, 2015, 08:45:30 pm
content: I have tons of 75ohm Bnc connectors and cabling around. I cant even find 50ohm cable anywhere locally! I mostly use this stuff for A/V and RTL-SDR antenna stuff.I know that using 75ohm for RF when just receiving has negligible effects when plugged in to a 50 ohm antenna jack. Anyways Ive done a lot of reading on DIY bnc scope probes. I plan to build a very short set, maybe 6 inches for some differential PSU ripple testing. I was curious on te scope end, the 50ohm I always see is in parallel with the scopes input, obviously causing a voltage divider.. I guess my question is should I just use 50 ohm termination and series dampening resistors, or 75ohm to match the impeadence of the cable? Im more worried about reflection than anything else if I use the wrong resistors, Im only trying to get 25mhz of bandwidth so ill keep the cables under quarter wave length of 25mhz and all that good stuff, just wondering if using 75ohm parallels to make the voltage divider is necessary (since this is obviously not an even 2x probe) or if using 50ohm's and just writing off the mismatch is a better idea?

author: Performa01
author_rank: Super Contributor
timestamp: September 30, 2015, 09:00:11 am
content: In order to get good pulse response, you want to avoid reflections.Ideally, both ends of the cable should be terminated with its characteristic impedance, but in many cases it is enough to just terminate the receiver correctly.That means, having a 75 Ohm pass-through terminator at the scope input is mandatory. If probing a very low impedance source, a series damper resistor at the source end might be a good idea too - the value depends on the actual source impedance at higher frequencies and you would have to try out several values <75 Ohm to achieve best signal fidelity.In general, impedance matching is not an issue for wavelengths greater than 10 times the electrical cable length. From memory, I think the actual (physical) length of RG59 is about 2/3 the electrical length.
HP 6611C Power Supply, too noisy? - Page 1
Forum section: electronics / testgear

author: ElektroQuark
author_rank: Unknown
timestamp: June 26, 2015, 07:43:54 am
content: I thought I post about this a couple of weeks ago but can't find the postSo here it is againb.I have just pruchased a HP 6611C System Power Supply.It works, andit looks likes it's caliobration is fine, buit is somewhat noisy and I don't know if it is normal for this type of suply.At power up there is a noise from... the transformer? Like a "powmmmmmm".Then, the noise is covered by the fan noise.Is that commond for this units?

author: twam
author_rank: Unknown
timestamp: June 26, 2015, 11:55:57 am
content: Had the same thing on my 6612C.

author: dom0
author_rank: Super Contributor
timestamp: June 26, 2015, 03:23:59 pm
content: Thumping is quite normal with larger transformers.

author: ElektroQuark
author_rank: Unknown
timestamp: August 12, 2015, 02:46:21 pm
content: Somehow I missed those answers.Thank you very much.

author: SharpEars
author_rank: Unknown
timestamp: September 29, 2015, 05:14:42 pm
content: Quote from: EdoNork on June 26, 2015, 07:43:54 amI've got it's ultra-rare red-headed step child cousin, the 6611C-J05 and aside from a fairly loud turn-on thump (like you just turned on the power for a small city), it also has a very VERY audible 60 Hz hum while operating. This is a bit masked by the fan, but you can always hear it, especially at low load when the fan spins down.By the way, you probably should not try to calibrate the thing, if your spelling of the word caliobration (sp) is any indicator of your ability to calibrate.
Adding external AM and FM modulation  - Page 1
Forum section: electronics / testgear

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 28, 2015, 04:44:18 pm
content: I am used to using sig gens that have built in, internal modulation. Is there a way to externally modulate with this sig gen? If so, what would the test set up look like? The input port is part of the frequency counter function as far as I am aware so I think id need to externally modulate on a breadboard or something.Sent from my SM-G900P using Tapatalk

author: gby
author_rank: Frequent Contributor
timestamp: September 28, 2015, 04:53:15 pm
content: Daniel,I have this generator and have experimented with it. You could add AM modulation by using for example an Analog device AD734AN 4 quadrant analog multiplier IC on an extra board added inside. The FY3200 series has plenty of room inside for an extra circuit board and more than likely plenty of power from the +/-12V internal supply.However, without interfacing into and changing the FPGA code you won't be able to do FM modulation.gby

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 29, 2015, 12:20:11 am
content: Quote from: gby on September 28, 2015, 04:53:15 pmThank you for the chip recommendation. I pulled up the datasheet and it seems like a very capable chip. If I am only interested in 1khz AM signal, would there be an easier implementation? I am on board with creating a custom board to add inside the unit with a pushbutton switch to turn on this specific modulation requirement.-DanSent from my SM-G900P using Tapatalk
Latest DS2000 firmware (3.3.2.6) BUG - Page 1
Forum section: electronics / testgear

author: etl17
author_rank: Contributor
timestamp: September 27, 2015, 07:58:05 pm
content: After updating my Rigol MSO2072A-S ("fully upgraded") to the latest firmware, I am experiencing very slow UI response for timebase settings of 10ms and slower. I was wondering if anyone else has a similar experience.....The problem seems to occur when only one channel is turned on and the Acquire->Anti Aliasing is also on.(Sorry for opening a new topic for this, I didn't realize that this has already been discussed on another DS2000 thread).
MONSANTO FRECUENCY METER - Page 1
Forum section: electronics / testgear

author: josep_astrud
author_rank: Newbie
timestamp: September 27, 2015, 03:54:31 pm
content: Hello everyoneI need the schematic or better yet, Service Manual a frequencymeter that made Monsanto years ago. Is this:8730 COUNTER FREQUENCY 520 MHz.Someone has it?I've searched the internet and appears neither alive nor dead.If anyone can help I would really appreciate it.This badly damaged on the outside but immaculate inside.Indicate price, shipping charges, etc.Best regardsJosephjosep_astrud@yahoo.es

author: Simon
author_rank: Unknown
timestamp: September 28, 2015, 06:37:35 am
content: please do not double post. it does not get you help faster and annoys people.

author: josep_astrud
author_rank: Newbie
timestamp: September 28, 2015, 08:58:31 am
content: Ok. I am sorry.Jose
Advantest R6551 Multimeter - Page 1
Forum section: electronics / testgear

author: radhaz
author_rank: Regular Contributor
timestamp: September 27, 2015, 11:59:09 pm
content: I bought this a while back. It's a 5.5 digit DMM, pretty well made. It had an issue where it would not measure ACV or ACI. Turns out there is a separate board for measuring AC, which this unit did not have.I found another unit for sale cheap and took a chance on it. It has the AC board, but it has a bad transformer. I swapped in the AC board and now have (inaccurate) AC readings.Here are some pics of the beast:

author: Vgkid
author_rank: Super Contributor
timestamp: September 28, 2015, 03:02:12 am
content: That is a rather interesting meter. I do find it funny to see the 4052 with guard traces.Gotta love the high impedance daughterboards, and the mix of smd and through hole components.

author: radhaz
author_rank: Regular Contributor
timestamp: September 28, 2015, 03:15:59 am
content: Any ideas on a poor man's AC calibrator? I just want to get AC kinda sorta close to reality.

author: Vgkid
author_rank: Super Contributor
timestamp: September 28, 2015, 03:28:21 am
content: Closest to diy, I always wanted to try it.http://cds.linear.com/docs/en/lt-journal/05_03-12-LTC1968-Pei.pdf

author: lowimpedance
author_rank: Super Contributor
timestamp: September 28, 2015, 05:43:53 am
content: Is changing the transformers over complicated?, or the cheaper unit too beat up?. Just a thought that the one with the dud transformer may actually be okay for cal. with all its 'cards'.

author: radhaz
author_rank: Regular Contributor
timestamp: September 28, 2015, 06:19:15 am
content: I may try moving the trans over to the duff unit. I do have soldering gear for that.
KIKUSUI Sweep Generator model 351 - Page 1
Forum section: electronics / testgear

author: josep_astrud
author_rank: Newbie
timestamp: September 27, 2015, 04:01:46 pm
content: Hello everyoneI need the schematic or better yet, Service Manual a sweep generatorthat made by KIKUSUI years ago. Is this:KIKUSUI Sweep Generator model 351Someone has it?I've searched the internet and appears neither alive nor dead.If anyone can help I would really appreciate it.This badly damaged on the outside but immaculate inside.Indicate price, shipping charges, etc.Best regardsJosephjosep_astrud@yahoo.es
What the heck is this? (Leybold high voltage bipolar amplifier 865 975) - Page 1
Forum section: electronics / testgear

author: uoficowboy
author_rank: Regular Contributor
timestamp: October 03, 2015, 02:50:03 am
content: I couldn't help myself... I saw this on Ebay... didn't have a clue what it was... but I wanted it.I've posted images to imgur:http://imgur.com/a/UGxb3Does anybody know anything about this device? The Internets know nothing about it.It appears to have a bipolar HV supply (I'm guessing +/- 1-2KV based on the 10 series 450V capacitors)It has two tubes - I'm assuming a push and a pull tube? I know nothing about tubes I'm afraid.The two connectors on the back labeled remote seem to control it - it looks like they go to opto isolators on the front board.Any idea of the vintage? It's nearly spotless so it doesn't look old - but the West German capacitors make me think otherwise.

author: eas
author_rank: Frequent Contributor
timestamp: October 03, 2015, 04:01:51 am
content: My guess on the date is 1984, based on the serial number, and that a lot of components have what I'm assuming to be date codes "82" and "83."As for what its for, the "spectrometer output" on the back is a clue. Perhaps a power supply for a mass spectrometer?

author: ebastler
author_rank: Super Contributor
timestamp: October 03, 2015, 07:11:44 am
content: Here is such an amplifier as part of a complete instrument -- an electron spectrometer:http://www.swapauction.wisc.edu/Listing/Details/1195335/Electron-Spectrometer-38605

author: bitwelder
author_rank: Super Contributor
timestamp: October 03, 2015, 08:47:33 am
content: Googling for the model number "865 975" finds also this document: "Operating Instructions forLeybold EA11-MCD XPS Chamber" where it lists a Multiplier supply (865976) and a HV amplifier bipolar (865978)http://research.chem.ucr.edu/groups/zaera/images/documents/uhv5_ucchamber_2005-04.docFascinating.

author: uoficowboy
author_rank: Regular Contributor
timestamp: October 03, 2015, 04:39:57 pm
content: Thanks guys - that's super interesting to see a sort of manual and the full suite of devices!If this thing is some sort of amplifier/power supply - any estimates on power output? I do not know tubes well enough to guess myself...

author: dom0
author_rank: Super Contributor
timestamp: October 03, 2015, 07:10:15 pm
content: Not much. Maybe 10-30 W - a few mA worth of HV.

author: ebastler
author_rank: Super Contributor
timestamp: October 04, 2015, 06:06:46 am
content: Quote from: dom0 on October 03, 2015, 07:10:15 pmAgreed. And as the rated input (supply) power of this unit is only 35W, the HV output power will probably be on the low side of the range you gave.
M102v5-10: Calibrating a 10-bit equipment with 3.5 digit multimeter? - Page 1
Forum section: electronics / testgear

author: technix
author_rank: Super Contributor
timestamp: September 27, 2015, 06:14:03 am
content: My dummy load is finally working! M102v5-10 is a test load with 10 bit resolution but it requires a few calibration values (Vref from MC1403 voltage reference chip, Vdac_min and Vdac_max from TLC5615 10-bit DAC, as well as Rsense from the power sense resistor) stored in its on-board EEPROM to work. The best multimeter I have is a 3.5 digit Zhenxing DT-890.Can I calibrate my M102v5 with this 3.5 digit multimeter, or should I go for a 4.5 digit multimeter or better? 10 bits is a range of 0 to 1023, covers slightly more ground than the 3.5 digit meter.By the way, the internal calibration registers are 16 bits long.

author: singapol
author_rank: Frequent Contributor
timestamp: September 27, 2015, 09:05:52 am
content: Quote from: technix on September 27, 2015, 06:14:03 amIt all depends on how accurate or stable your various cpmponents used in your circuit. Why not use a 3.5 digit meter averaging +/- 1% tolerance when MC1403 voltage reference accuracy is also 1%? Make sense...that's provided you have confidence in 3.5 digit meter calibration. See the multimeter article.In practice one would use a higher accuracy meter to calibrate but since you don't have one or want to spend money 3.5 digit meter will have to do.Look at the big picture now...you are using 10 bit dac, now to get true 10 bit accuracy or resolution is 1%MC1403 suitable?. Temperature , non linearities in dac and quality of Vref influence results. So will you get 10 bit resolution with MC1403?. The temperature coefficient of MC1403 is typically 10 ppm to maximum 40ppm at 25 degree celcius. According to Walt Jung article: Getting the most of voltage reference, to get true 12 bit accuracy one would need a 5 ppm voltage reference so MC1403 is good for at best 9 bit to 8 bit resolution. See page 16.So is 8 bit good enough for your application? Why not since it's a fun project. Even digital scopes use 8 bit adc.It really depends on what you want or designing for. Congratulation on your success.MC1403 datasheet:http://www.st.com/web/en/resource/technical/document/datasheet/CD00000870.pdfGetting the most of voltage reference - Wat Jung:http://waltjung.org/PDFs/Getting_the_Most_from_IC_Voltage_References.pdfHow to determine multimeter accuracy:http://www.designworldonline.com/how-to-determine-digital-multimeter-accuracy/
$13 chinese multimeter - Page 1
Forum section: electronics / testgear

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 26, 2015, 05:27:05 pm
content: Sent from my SM-G900P using Tapatalk

author: retiredcaps
author_rank: Super Contributor
timestamp: September 26, 2015, 06:08:55 pm
content: What model is this? The pcb suggests it is some sort of Mastech 8??? (MS8).

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 26, 2015, 06:10:22 pm
content: Sent from my SM-G900P using Tapatalk

author: zoltan
author_rank: Contributor
timestamp: September 26, 2015, 08:04:26 pm
content: Is it just bypassing the fuse?

author: zapta
author_rank: Super Contributor
timestamp: September 26, 2015, 08:28:43 pm
content: It's amazing what $13 buys you these days.I would use it for low voltage only.

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 26, 2015, 09:17:57 pm
content: Quote from: zoltan on September 26, 2015, 08:04:26 pmI believe it's only for the microamp function. No 10A from a quick glance at the manual and case.Sent from my SM-G900P using Tapatalk

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 26, 2015, 09:18:22 pm
content: Quote from: zapta on September 26, 2015, 08:28:43 pmDefinitely. Low voltage only for this guy.Sent from my SM-G900P using Tapatalk

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: September 27, 2015, 12:45:04 am
content: Short probe leads. Somewhat ok. Not sure on battery or much else.Sent from my SM-G900P using Tapatalk

author: Fungus
author_rank: Super Contributor
timestamp: September 28, 2015, 08:53:43 am
content: Quote from: wilfred on September 28, 2015, 06:40:53 amFor pocket? The Uni-T. No contest.Your auction doesn't show it but it comes in areally really good case.Just the case makes it a winner IMHO.nb. It doesn't have a 10A range, if that's a deal-breaker...the amps range is 400mA (and it has a self-resetting polyfuse if you overload it).
R&S CMU200 Reference Frequence Unlocked message during selftest - Page 1
Forum section: electronics / testgear

author: _Wim_
author_rank: Super Contributor
timestamp: September 27, 2015, 05:45:45 am
content: Hi,After a lot of searching for a R&S CMU200 or CRTU of recommended here on the forum, I finally found one that had the modules I wanted (I/Q-interface, option B17) and for a reasonably affordable price. Yesterday it arrived at my home.When I run the selftest, during the test of the reference board, it briefly shows the message "reference frequency unlocked". However, it also shows "all tests passed" in the end. Is this behaviour normal, or does my unit have a problem.Additional info: I have reset the unit to its default settings, and checked, it is configured to work with the internal reference. My unit has option B12 installed.

author: TheSteve
author_rank: Unknown
timestamp: September 27, 2015, 06:06:17 am
content: I can't for certain but I suspect that is actually part of the test - it unlocks it on purpose and then relocks again to verify its presence. I have seen Agilent perform similar tests.

author: _Wim_
author_rank: Super Contributor
timestamp: September 27, 2015, 06:18:20 am
content: That seems indeed a logical explenation. The error also isn't shown any more when I work with the unit, so probably it is indeed part of the test. That is a relief. Thanks for the feedback.
Measuring transistor temperatures with an ear thermometer - Page 1
Forum section: electronics / testgear

author: Solder_Junkie
author_rank: Frequent Contributor
timestamp: September 27, 2015, 07:05:49 am
content: Further to my earlier question regarding measuring transistor tempertures with an ir thermometer, Sean replied with a suggestion of using a cheap domestic ear thermometer. Most of these only read temperatures a few degrees either side of body temperature and outside that range show Hi or Lo... Which isn't much use for other purposes. However, they have a very small (3mm or so) sensor and a narrow probe.The "Ezi" range of thermometers have an "Object" measuring range going from 0 - 100 deg C and are very cheap, less than 10 GBP delivered on eBay.co.uk. The object range is enabled by fitting a front cover, which operates a plunger switch to change the range. The switch is easily glued down allowing the use of the narrow probe without the wide cover, which can be placed close to small components such as TO92 sized transistors.Very useful and a lot cheaper than a thermal camera for hobby use.

author: SeanB
author_rank: Super Contributor
timestamp: September 27, 2015, 07:12:33 am
content: Just keep a black dry wipe marker with it, so that you can make a black target on shiny surfaces like aluminium or metal cans, so that the thermometer will read the IR emission of the actual object instead of whatever is reflected off the shiny surface. Makes a big difference, uswe on ewvery part to ensure that the emissivity to the sensor is constant, instead of varying wildly.https://en.wikipedia.org/wiki/Thermography#Emissivityhttps://en.wikipedia.org/wiki/EmissivityA little explanation and a rough table for most common materials.
Looking for replacement fuse for Brymen BM257 multimeter - Page 1
Forum section: electronics / testgear

author: rvmeush
author_rank: Contributor
timestamp: September 26, 2015, 04:47:51 pm
content: The high amp fuse on my Brymen multimeter is blown and I was looking for a replacement. The meter literature says that the meter is rated for 8 Amps, but the fuse that's installed is a Limitron KTK-10, which is a 10 Amp fast acting fuse.I've looked online for replacements and they seem to be pretty pricey. I have found some fuses on Amazon for a Fluke multimeter (DMM-11) which are more reasonably priced but I'm not sure it's safe to use that model fuse.Does anyone have a good recommendation for a replacement fuse and a reasonably priced source? Thanks.

author: bills
author_rank: Frequent Contributor
timestamp: September 26, 2015, 07:05:47 pm
content: The fluke fuse is rated 11amp @1000v. And should be fine.The ktk-10 is rated @10 amp 600v.here is one for $7.00http://www.ebay.com/itm/like/181673105443?ul_noapp=true&chn=ps&lpid=82

author: mos6502
author_rank: Frequent Contributor
timestamp: September 26, 2015, 07:13:10 pm
content: Jeez, all you need is a bit of aluminum foil.

author: rvmeush
author_rank: Contributor
timestamp: September 26, 2015, 07:54:47 pm
content: Quote from: bills on September 26, 2015, 07:05:47 pmThanks very much for the info and the link.
Agilent/Keysight InfiniiVision Voltage diplayed when moving the beam vertically - Page 1
Forum section: electronics / testgear

author: paschulke2
author_rank: Contributor
timestamp: September 26, 2015, 01:53:05 pm
content: I had the luck to get a Keysight DSO-X2024A at very good price and I am very happy with it.There is one minor quirk I (long time Tektronix user) don't understand: When I move a beamup, anegativevoltage is displayed. I would have expected a positive voltage. Of course () I read the manual, which says:QuoteAh ja. What?Why a negative voltage for a move in positive direction? Can someone enlighten me?

author: HighVoltage
author_rank: Super Contributor
timestamp: September 26, 2015, 02:58:34 pm
content: I guess it is just a way of definition.In this case it is how much you have to correct, to get back to zero.All my Agilent scopes do the same.But not only in the offset of the vertical voltage axis, but also the horizontal time axisHere are two pictures of horizontal and vertical moving.Interestingly it is captured with the screen shot.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: September 26, 2015, 03:55:59 pm
content: Quote from: paschulke2 on September 26, 2015, 01:53:05 pmIt's simple, the old scope probably showed the vertical distance in Volts between the midline (reference) and the trace while the new scope shows the vertical distance between the trace (reference) and the midline

author: paschulke2
author_rank: Contributor
timestamp: September 27, 2015, 12:00:06 pm
content: The Tektronix Scopes I know have an "offset" and a "Pos." setting. I have just checked it with a DPO2024B: The offset behaves exactly like the vertical position on the Keysight. I guess I've never used the "offset" setting on a Tektronix Scope.To me this is bit like a Multimeter that displays the voltage at the "COM" input referenced to "V/Ohm" … just a matter of definition
Array 3720A Electronic Load - Firmware Update - Page 1
Forum section: electronics / testgear

author: motocoder
author_rank: Unknown
timestamp: September 26, 2015, 10:30:56 am
content: Second try here, hoping somebody knows how to get the firmware updater working on this thing. I had a very confusing, unfruitful conversation with Array, specifically with a lady there who just does not speak English very well, and ultimately she just stopped responding to my questions. I never could figure out what she was saying...When I try to update the firmware using their update tool, I first get an error telling me that the device version is newer than the firmware (it isn't), then when I hit OK, there is a very long pause, followed by a message telling me to check the communications. I do see that it's tried and communicate with the load, because the Remote light is lit.I thought maybe it was a Windows version thing, so I set up Windows 7 32-bit on a disk partition, booted into that, and tried it there, but no luck.I opened the unit up, and I see what looks to be a JTAG connector next to the micro (an atmega128A). I wonder if the easier route might be to just connect that up to my JTAGICE3, and program the micro that way. The files they supply are marked *.bin, though, so I am not 100% sure it's a file I can program directly that way.Any help, much appreciated.
Batronix promotion for Rigol Scopes - Page 1
Forum section: electronics / testgear

author: Godzil
author_rank: Frequent Contributor
timestamp: September 23, 2015, 03:12:13 pm
content: I've just receive an email from Batronix about a promotion they do on most of the Rigol Scope they sell:If you buy a DS2000 before the end of this year they will offer you all the paid options!See:http://www.batronix.com/shop/rigol/DS2000A.htmlThat's unfair, I've just bought mine, it's only two month oldPart of the email I received:QuoteI want my (official) options for free

author: Fungus
author_rank: Super Contributor
timestamp: September 23, 2015, 03:20:51 pm
content: http://gotroot.ca/rigol/riglol/

author: Godzil
author_rank: Frequent Contributor
timestamp: September 23, 2015, 03:27:38 pm
content: Quote from: Fungus on September 23, 2015, 03:20:51 pmOh it's not like it I don't know about how to get unofficial licences, but in this case they are official licences

author: miguelvp
author_rank: Super Contributor
timestamp: September 23, 2015, 03:58:18 pm
content: You mean the "offcial" licenses right?Kidding aside, if you bought it from batronix, why don't you send them an e-mail requesting the upgrades?

author: Godzil
author_rank: Frequent Contributor
timestamp: September 23, 2015, 04:15:57 pm
content: I could try for sure, but I'm nearly sure about the answerAnyway I just wanted to share this with everyone here, about the promotion, not about my problem

author: miguelvp
author_rank: Super Contributor
timestamp: September 25, 2015, 03:42:11 pm
content: Quote from: Godzil on September 23, 2015, 04:15:57 pmWell, someone asked and is getting it:https://www.eevblog.com/forum/testgear/rigol-special-free-option-pack-bundle-with-dsmso2000a-series-scopes/Edit: but to be fair, he dealt with TestSouthEast not Batronix, but I don't see any reason they wouldn't if their competition does

author: Godzil
author_rank: Frequent Contributor
timestamp: September 25, 2015, 03:47:42 pm
content: Unfortunately, after contacting them, they don't really want to do anything, as they answer me:"I´m sorry about the promotion. We didn´t know it either that Rigol was coming up with this idea."I should try to contact directly Rigol?
Signal Hound Spike Preset colours - Page 1
Forum section: electronics / testgear

author: tomlut
author_rank: Regular Contributor
timestamp: September 25, 2015, 07:03:13 am
content: I have been evaluating a couple of Signal Hound's spectrum analysers, the SA44B and BB60C.The only difficulty I have is that I can not set the dark colour scheme preset. The two side panels stay a lighter colour that it is impossible to read the white text on:I know it is not supposed to look this way, as per The Signal Path video:I've tired turning it off and on again (the software, the PC and the specan).Tried reinstalling the software. No change.Any idea how to fix this? Is it a windows thing? I cant find any colour settings that make a difference.I'll be writing to the distributor and possibly the manufacturer to see if they know what is going on but thought I'd try here first.TIA.

author: Mr Simpleton
author_rank: Unknown
timestamp: September 25, 2015, 01:45:23 pm
content: What version do you use? It seems they adressed this bug in version 3.14 which was released 21 sept. Try d/l and see if it helps.

author: tomlut
author_rank: Regular Contributor
timestamp: September 27, 2015, 03:45:15 pm
content: Yep that fixed it. I had only downloaded the software last week so assumed I was using the latest version.
Analog oscilloscope BWD 824 setup, calibration, improving focus? - Page 1
Forum section: electronics / testgear

author: SteveLy
author_rank: Regular Contributor
timestamp: September 23, 2015, 01:38:45 pm
content: Hello good folks of EEVblog,I've scored myself a 1982 vintage analog scope: a Melbourne made 35 MHz BWD 824. It was not working when I got it but it was an easy fix (power switch). I've used scopes at work since the early 1990s but this is the first scope of my very own that I intend to use mostly for audio related projects (effects, mixers, EQs, XY mode for tuning) and other low frequency (<400kHz) applications.I'm looking for any tips on setting up and calibrating the scope to get the most out of it. Off the bat I'd like to know if there is a way to improve the beam focus. It's not bad but it could be better. When viewing the beam as a dot, it's slightly elongated in the vertical direction at best focus (as adjusted using the focus knob on the front and the astigmatism pot on the back of the unit). Is there a way to improve this or is it just how it goes with such an old CRT?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: September 23, 2015, 07:33:44 pm
content: https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/msg594414/#msg594414

author: tautech
author_rank: Super Contributor
timestamp: September 23, 2015, 08:17:11 pm
content: When I look at the Vertical attenuators I see the variable pots not in the Cal position, this is likely the reason for the different amplitudes seen.

author: tautech
author_rank: Super Contributor
timestamp: September 24, 2015, 12:01:56 am
content: Link to User & Service manual:http://www.kevinchant.com/uploads/7/1/0/8/7108231/bwd_824_001.pdfAdjustment of CRO's is not something you want to rush into especially with one this age.It is likely some components have drifted with age and PSU E caps in particular may have to be replaced.Work through the PSU first, the pre-regulator and the SMPS to ensure it is to spec,Then address any further adjustment IF necessary.Keep us posted.

author: SteveLy
author_rank: Regular Contributor
timestamp: September 24, 2015, 02:25:14 am
content: Thanks tautech for the great tips!
Datalogging thermometer recommendations. - Page 1
Forum section: electronics / testgear

author: Vgkid
author_rank: Super Contributor
timestamp: September 23, 2015, 09:22:33 pm
content: As the title suggest post your data logging thermometer reccomendations.What i need is one that uses an external temperature sensor. It will be subjected to temps from -20 to 100C.USB connectivity is preferred, and more than 1 chanel would be nice(2+ would be better).BUT it must be cheap.Not looking for real high accuracy.

author: biot
author_rank: Regular Contributor
timestamp: September 23, 2015, 11:47:14 pm
content: Let me warn you about the UNI-T UT325: does everything you describe and inexpensive, BUT it only ever sends out data about one of its two channels -- big firmware screwup, since both are shown on the display just fine.

author: radhaz
author_rank: Regular Contributor
timestamp: September 24, 2015, 12:04:25 am
content: There's a number of China usb data loggng thermometers on ebay cheap.

author: TSL
author_rank: Regular Contributor
timestamp: September 24, 2015, 06:24:51 am
content: +1 radhazI've used one of these to track a misbehaving lab airconhttp://www.ebay.com/itm/BTHP02-2-Chs-Humidity-Temperature-Dew-Point-Data-Logger-USB-64K-32-000-readings-/281703381613Stick it on the wall for a month and collect and plot later.

author: AndyC_772
author_rank: Super Contributor
timestamp: September 24, 2015, 07:01:21 am
content: Amprobe TMD-56http://www.amprobe.com/Amprobe/usen/HVAC-Tools/Thermocouple-Thermometers/AMP-TMD-56.htm?PID=73414

author: Rick Law
author_rank: Super Contributor
timestamp: September 24, 2015, 07:25:16 pm
content: If you want to make one, an Arduino with the LM35z from TI.The TI LM35z is -55C to 150C with "typical accuracy" of 1/4C according to their datasheet.This Arduino+LM35z solution works rather well for me, but I have not exposed the Arduino part to -20C. I use a meter-long wire and stick only the LM35z part into the outside environment.
Siglent SPD3303X/XE Lab Power Supply - Page 1
Forum section: electronics / testgear

author: Messtechniker
author_rank: Frequent Contributor
timestamp: September 22, 2015, 05:07:47 pm
content: Well I'm in the market for a new benchtop lab power supply.The new Siglent SPD3303X/XE seem to fit my needs and my pocket for that matter.But has anyone seen these in the wild yet?And is there someone waiting with a wood file for the Pease Test?Dave?Yours Messtechniker

author: awallin
author_rank: Frequent Contributor
timestamp: September 24, 2015, 08:30:42 am
content: 509eur + VAT from batronix I hear.. (free shipping!) - not on their website yet but coming maybe soon.What's the Pease test?

author: Messtechniker
author_rank: Frequent Contributor
timestamp: September 24, 2015, 12:07:32 pm
content: The Pease test is desribed on page 2 of this file:https://www.elektormagazine.com/files/attachment/48
Siglent SDG 1025 Func. Gen. - How to set English as Default? - Page 1
Forum section: electronics / testgear

author: mikefromsac
author_rank: Contributor
timestamp: September 24, 2015, 12:03:37 am
content: I've tried a variety of ways within the Utility menu, but on every startup it asks what language I'd like to use. Does anybody know the correct way to make it remember my Default settings in the Utility Menu?Thanks in advance ... Mike

author: tautech
author_rank: Super Contributor
timestamp: September 24, 2015, 12:13:32 am
content: Quote from: mikefromsac on September 24, 2015, 12:03:37 amWelcome to the forum.AFAIK the latest FW solves this problem.It is available here:http://www.siglentamerica.com/support_software_15Let us know if it cures it.

author: mikefromsac
author_rank: Contributor
timestamp: September 24, 2015, 02:04:59 am
content: Wow, that was so easy and it's all good. Thank you so much! I'm very excited to learn to use this cool little generator (it's my first). Thanks tautech.

author: tautech
author_rank: Super Contributor
timestamp: September 24, 2015, 02:15:25 am
content: Quote from: mikefromsac on September 24, 2015, 02:04:59 amThanks, you're most welcome.Enjoy.
MT2400 power graphing multimeter  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: September 23, 2015, 09:49:12 pm
content: Hi thought I post here as well maybe someone can help this odd problem:MT2400 power graphing multi meter with a problem:It will not measure AC voltage or show AC signals on channel 1 when you select the AC measurement function.However it does show AC signals when in other modes e.g if i go to the menu and select AC pulse generators then channel 1 will happily display AC signals.Also Channel 1 has no problems displaying D.C signals and D.C measurements.Note only channel 1 is designed to measure AC signals. The rest of the meter seems to function OK.The input coupling to this graphing multi meter is D.C on all channels. To get AC coupling requires an AC filter as shown in the link below:I have tried to supply a pure A.C signal to the input channel 1 it will not read or show the signal when in AC measurement mode.http://resources.aeswave.com/old/TechNotes/index1.htmCould this be a firmware issue or corrupt data in the memory eeprom card?R_G_B_Thanks
Rigol DS1000E spectrum analyzer via USB - Page 1
Forum section: electronics / testgear

author: Gabri74
author_rank: Regular Contributor
timestamp: September 23, 2015, 08:35:00 am
content: Found this interesting article on Hackaday about using a Rigol DS1000E to acquire samplesand then doing all the math on the PC.Seems interesting...For now it doesn't seem to work on the 1000Z series...Hackaday article:http://hackaday.com/2015/09/22/a-better-spectrum-analyzer-for-your-rigol-scope/Original author article:http://rheslip.blogspot.ca/2015/09/software-spectrum-analyzer-for-rigol.htmlI've some reservations on this phrase from the author article:Quotemmm.... 500MHz span with a 100MHz frontend... mmmm....

author: Karel
author_rank: Super Contributor
timestamp: September 23, 2015, 09:04:01 am
content: Forget it, it's going to be slow as hell.The workflow:1. set the scope memory depth to anything but auto.2. start an acquisition3. stop the acquisition4. download the deep memory data to the pc, either via USB or LAN, depending to the memory size this can take up to more than a minute5. execute an FFTIt's a de-tour but for educational purposes the following demonstrates a proof of concept:Download the waveform from the scope using this tool:http://www.teuniz.net/DSRemote/Open the waveform data in EDFbrowser:http://www.teuniz.net/edfbrowser/In EDFbrowser, observe the FFT:http://www.teuniz.net/edfbrowser/EDFbrowser%20manual.html#PowerspectrumYou can write a program to do all this for you quiet easily, but the screen updates takes ages.Unfortunately, The Rigol scopes are very slow with downloading the waveform data and, even worse, it must be done in "stop" mode...
Rigol DP832, draws current when channels are turned off - Page 1
Forum section: electronics / testgear

author: jjkaa
author_rank: Newbie
timestamp: September 17, 2015, 06:00:03 pm
content: I have being doing some work using a SuperCap, and during this work i discovered that when i turn off the channel connected to the SuperCap a discharge started. Doing some more experiments, it seems that all 3 channel has a constant current load at about 40 mA when turned off.This can be tested by connecting channel 1 to either channel 2 or 3 (plus to plus, and minus to minus), turning up and down the voltage on channel 1 (and having channel 2/3 in off) I can see that channel 1 is drawing about 40mA no matter the voltage.Is this behavior stated somewhere or is it common knowledge?

author: mcinque
author_rank: Unknown
timestamp: September 17, 2015, 06:11:16 pm
content: Maybe it can be something related to the fact that almost any lab PSUs shorts the output when a channel is turned off?

author: mij59
author_rank: Frequent Contributor
timestamp: September 17, 2015, 07:02:03 pm
content: The current source on the output is used to reduce the transient response time to load changes, worst case scenario would be load change from zero to maximum current.Shorting the output of a power supply is a bad idea, in your case it would mean that the super cap will blow up what ever is used to short the output.

author: jjkaa
author_rank: Newbie
timestamp: September 17, 2015, 07:21:15 pm
content: OK, I had the the false assumption, that the off-switch actually was some sort of relay function disconnecting the output. The DP832 is rather new in my lab, in the past I had a traditional power supply, where the off function was pulling out the plug. It seems that I have to work that way again, at least when measuring discharge time of the SuperCap power supply I am building.

author: mcinque
author_rank: Unknown
timestamp: September 18, 2015, 11:28:04 am
content: Quote from: mij59 on September 17, 2015, 07:02:03 pmI want to say "discharged"Look at my signature and you will understand that I'm not new to this facepalms

author: verbatone
author_rank: Contributor
timestamp: September 22, 2015, 06:38:04 am
content: I seems quite a few of these units have this problem. I had one, sent it back and got a unit without the issue. If it's just a calibration issue, it seems Rigol would be much better off describing how to (re)calibrate the unit (if possible) rather than shipping the units back and forth. It seems crazy that they can't simply figure out these units draw current without load in the factory...seems obvious to me.
Teardown : Keithley Model 182-M sensitive voltmeter - Page 1
Forum section: electronics / testgear

author: TiN
author_rank: Super Contributor
timestamp: September 18, 2015, 08:35:45 am
content: Traded one of my 2001 DMMs for this interesting instrument.Tbd..If you have ideas for experiment involving low DC voltage , let me know.

author: daqq
author_rank: Super Contributor
timestamp: September 18, 2015, 09:24:32 am
content: QuoteTry some test plugs thermal voltage. Also banana connectors, coaxes, all sorts of connectors really. That would make a nice experiment - where can you find your unwanted thermocouples.

author: Zucca
author_rank: Unknown
timestamp: September 18, 2015, 09:34:22 am
content: Quote from: TiN on September 18, 2015, 08:35:45 amCongrats! I was looking for that too. I am happy it is in your good hands now.1) Take a high amp connector, see what the voltage drop is in high current situations (>30A let´s say). will it be linear to the current or the temperature effect will kick in?2) We all know the GND layer on a PCB, test how much it will shift in an interesting PCB. Will it be 0V also on the other corner of the board?3) Take different op amp and test the Offset Voltage on the output4) What about different DACs with the output set to zero? Will the analog output will be zero?BONUS) Try to measure how much current it is needed by the 182-M to do its measures.Bye

author: TiN
author_rank: Super Contributor
timestamp: September 21, 2015, 04:09:10 pm
content: Alright, first part ofreview is public, second part will feature measurements and more comparisons.Few money shots : front-end and LMx99 ovenized voltage reference.QuoteThis will be interesting, I'll try to do this.