hybridfree/eevblog-posts huggingface dataset:
Oscilloscope low level signal capability - Page 1
Forum section: electronics / testgear

author: bozidarms
author_rank: Regular Contributor
timestamp: March 23, 2016, 08:45:08 pm
content: Hi to the community,i will show some of oscilloscope low signal capabilities.It would be interesting to hear yours experiences and thoughts about that.Well:On the first picture is presented 700MHz, -65dBm signal.Of course, oscilloscope is way out of precise presentation, but anyway, signal is definitely visible.On second picture is 500MHz, -60dBm(632uV p-p) signal.Oscilloscope shows about 500uV p-p signal, what is well within -3dB analog bandwidth specification (actually, is only 2dB off).In both cases it is Rigol DS4012(4052) oscilloscope.Comments are welcome.Best regards,Bozidar

author: mswhin63
author_rank: Frequent Contributor
timestamp: March 24, 2016, 03:47:20 pm
content: Not sure of your setup, have you terminated the signal at the scope to 50ohm. If not then the mismatch will produce a higher or unreliable voltage at the scope input. If it is terminated then not bad.

author: bozidarms
author_rank: Regular Contributor
timestamp: March 24, 2016, 04:53:20 pm
content: Yes - it was terminated.Till now i haven't had so many experience with high grade oscilloscopes and low level signals.I was quite amassed too.regards,Bozidar
Searching schematics of Kontron 6001 frequeny counter - Page 1
Forum section: electronics / testgear

author: bernroth
author_rank: Regular Contributor
timestamp: June 24, 2014, 07:52:41 am
content: Hello all!I am searching for the schematics and/or the service manual for a Kontron 6001 frequency counter.Please let me know if you might have something available.Best regards,Bernhard

author: GOR
author_rank: Newbie
timestamp: January 11, 2016, 05:03:14 pm
content: Hello Bernard did you get an answer to your search at Kontron 6001?I am also looking for drawings / manual in this counter.Please let me know if you have any.best regards Jan /"GOR"

author: almarghi
author_rank: Newbie
timestamp: March 24, 2016, 03:10:50 pm
content: wouldn't be bad at all. I need it also
Vintage D5014 miliampermeter - Page 1
Forum section: electronics / testgear

author: vasi_ro
author_rank: Unknown
timestamp: March 23, 2016, 07:34:59 pm
content: Teardown of a vintage miliampermeter made in Russia. Unfortunately it's not workingMore details:http://zapadpribor.com/en/d50145/

author: vasi_ro
author_rank: Unknown
timestamp: March 23, 2016, 07:38:46 pm
content: More pictures ...If you like vintage test gear i can do more teardowns.

author: rrinker
author_rank: Super Contributor
timestamp: March 23, 2016, 10:28:05 pm
content: Too bad it's non-op, that is pretty neat. I have to say, I've never seen anything like that beam projection indicator.

author: joeqsmith
author_rank: Super Contributor
timestamp: March 24, 2016, 01:44:18 am
content: That's a pretty good looking setup. I like the air bubble gun sight to level it.
Waveform update rates of HMO scopes - Page 1
Forum section: electronics / testgear

author: pxl
author_rank: Regular Contributor
timestamp: March 23, 2016, 07:44:18 pm
content: Hi guys, HMO ownersI would like to ask you to make some measurements on your scope, I plan to create a "comprehensive" table so that we could compare all existing and future HMO scopes. At this point I would need 16 values only.The measurement - please setupinput signal: 2.5 V peak to peak, 100 kHz square wave (e.g. the built in pattern gen/square wave is ok in newest HMO scopes)the scope:- one channel only- edge trigger, AC filter- trigger time set to zero- please setup the trigger level to get max. waveform/s- all measurements, special settings offwfm/s - measure the trigger out freq (e.g. with Brymen 869, everyone has one)samples/s - reported by the scopeThese would be the values I am interested in at this point:TB/Record ModeMax. WFM. Rate - wfm/s,samples/sMax. SA. Rate - wfm/s,samples/sAuto - wfm/s,samples/s2ns143001G9001G141001G100ns5us200usI hope that I did not forget anything and all clear. Later, we could refine the prerequisites of the measurement, but for now, please measure these values. All participation will be appretiatedThank you!
TTi MX180TP - Page 1
Forum section: electronics / testgear

author: Robaroni
author_rank: Frequent Contributor
timestamp: March 23, 2016, 09:44:26 pm
content: Anybody got one of these or know anything about them?https://www.testequity.com/documents/pdf/tti/psu-mx_series-8p.pdfThanks,Rob

author: MarkL
author_rank: Unknown
timestamp: March 23, 2016, 10:07:47 pm
content: I did a review/teardown of the MX100TP about a year ago. It's still running fine.https://www.eevblog.com/forum/testgear/tti-mx100tp-triple-power-supply-teardown-and-review/

author: Robaroni
author_rank: Frequent Contributor
timestamp: March 23, 2016, 10:19:14 pm
content: I knew someone around here had to dig into one of these!Thanks Mark, I was looking at the R& S HMC4083 but this looks like it has more bang for the buck. I'll read your review.Rob
RSA306B - Page 1
Forum section: electronics / testgear

author: kazam
author_rank: Regular Contributor
timestamp: March 23, 2016, 01:28:20 am
content: So, there's a new spec out: RSA306B from Tek.http://www.tek.com/spectrum-analyzer/rsa306Looks like SFDR was improved from -50 to -60 dB.Anyone got one and care to comment?

author: G0HZU
author_rank: Super Contributor
timestamp: March 23, 2016, 01:42:18 am
content: A while back I was given access to a demo RSA306 for a few hours to evaluate it. This was a unit sent to my place of work and I was allowed to take it home for an evening.It didn't take me long to work out the internal frequency plan (in terms of LO and IF frequencies) and then produce a computer model to predict the spurious performance across every tuning step across the full tuning range.The results were shockingly poor as the model predicted mixer spurious terms below -10dBc for certain tuned frequencies and span settings. When measured, the unit was as bad as -9dBc in places. Other people found similar results when I told them where to tune and what test frequency to use and where to look for these places where the spurious performance collapses.https://www.eevblog.com/forum/testgear/tektronix-tek-rsa306-6ghz-signalspectrum-analyser/?nowapI haven't had access to a revised unit but I believe that Tek improved the frequency plan in later versions. So I hope it's a lot better than 9dB SFDR nowadays!

author: kazam
author_rank: Regular Contributor
timestamp: March 23, 2016, 03:33:34 am
content: Interestingly bad!I hope to have a demo unit for a couple of weeks since I have a good relationship with the local Tek rep.I'll make sure to post and hopefully they have improved performance in this updated model.There are also two new models, RSA500 and RSA600. Prices are a lot higher but hopefully you get what you pay for.
Just got a Korad KD3005P - Page 1
Forum section: electronics / testgear

author: gardner
author_rank: Regular Contributor
timestamp: March 09, 2016, 04:40:50 pm
content: I just bought a Korad KD3005P. This one has a different front panel that the KA3005P that has gotten a lot of discussion. It lacks the ability to switch outputs off/on and does not have presets, but otherwise is similar. It does have the USB/serial interface and would appear to support the same protocols as the KA version. I got this one because it was a good bit less expensive -- $160 vs $230 here in Ontario.I have had only a quick play with it so far. I compared the current and voltage display and set points to my Keithley 195A and it seems reasonably accurate -- within 1% or so, maybe better. It does seem to go off in the weeds if the current set point is very low -- 10mA .. 1mA or so -- and go into CC mode with no load at all, at random while changing the output voltage. This doesn't seem to be a big issue and doesn't happen at > 20mA set point. I guess its picking up the current to charge/discharge the output caps or something.Anyone else have one of these? Any experience with programming it?

author: gardner
author_rank: Regular Contributor
timestamp: March 23, 2016, 02:22:03 am
content: Someone PM'd me a question and I thought it would be worth posting the answer here.QuoteAs with the KA3005 models, this is a linear PSU.Mine is a switchable 220V/110V unit. I have it switched to 110.The main transformer is unmarked.There are two primary windings set up for series/parallel.There are a total of 4 secondary windings.One, I assume to be centre tapped runs off to the front panel. This one has two red leads and one black one.Next a non-tapped winding goes off to the interface panel at the back. This one isn't visible in the photo.Another non-tapped winding goes to the main power board.I didn't get the voltages on any of these windings.The main secondary has two centre taps.Measured with the mains input at 118.3V RMS, we have open circuit voltages as follows:BLACK -- 0VYELLOW -- 11.63V RMSWHITE -- 27.23V RMSRED -- 44.9V RMS

author: TomB19
author_rank: Contributor
timestamp: March 23, 2016, 03:07:57 am
content: Thank you. This is hugely helpful.
Heathkit PS-4 Power Supply--Manual Available? - Page 1
Forum section: electronics / testgear

author: N2IXK
author_rank: Frequent Contributor
timestamp: March 22, 2016, 06:42:26 pm
content: I just got a Heathkit PS-4 regulated 0-400V power supply that is nonfunctional, and the assembly work is pretty atrocious. I am thinking that this unit is a good candidate for a "rekitting" and reassembly.Unfortunately, I didn't get the original assembly manual, and can't seem to find one on the web anywhere. I can only find the schematic, which is helpful for troubleshooting, but I really need the complete manual to do a rebuild. Does anyone have access to a copy they can scan and share?
Picoscope 6000 series PSU - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: March 22, 2016, 10:59:08 am
content: Hi,Is there any Picoscope 6000 series user here?I have one without a power supply.From the manual I know it should provide 12VDC, 4A, center positive.From my observations it uses 2,1/5,5 DC power connector.Should the PSU have output negative connected directly to the PE in the AC mains plug ? (I can buy PSU with and without this link).Could someone send a closer picture of the original PSU?Thanks!

author: ADT123
author_rank: Regular Contributor
timestamp: March 22, 2016, 01:27:54 pm
content: Does this help?https://www.picotech.com/accessories/miscellaneous/ac-adaptor-12-v2 pin adaptors so not connected to ground.

author: doktor pyta
author_rank: Frequent Contributor
timestamp: March 22, 2016, 02:16:44 pm
content: Yes, thanks!However a closer picture would also be useful
SDM3055 DHCP - Page 1
Forum section: electronics / testgear

author: mojoe
author_rank: Frequent Contributor
timestamp: March 26, 2016, 06:36:01 am
content: For some strange reason, it looks like the SDM3055 DMM does not allow the setting of DHCP in the user interface.You can telnet into the DMM without any login or password. Poking around, I see the following.In "/etc/network/interfaces" - eth0 is set for DHCP (plus some strange "pre-up" command with "grep" in it).In "/etc/init.d/sysfs.sh" - "ifconfig eth0 10.11.11.104" sets the factory default static IP. This gets overridden somewhere with the IP you enter via the UI.Also in "/etc/init.d/sysfs.sh" - "/usr/bin/siglent/sdm.app" is invoked. No telling what this does.So far, I can't find where the static IP that you enter via the UI is stored and how eth0 is set to that address. The reason I want to enable DHCP is so that I can assign the IP address from the DHCP server in my home router. I have done this for a Siglent power supply and a Siglent function generator. Why Siglent did not allow DHCP on the DMM, I don't know.

author: tautech
author_rank: Super Contributor
timestamp: March 26, 2016, 06:51:13 am
content: @ mojoeWhat's your FW version?Latest (just released) is 16R2.

author: mojoe
author_rank: Frequent Contributor
timestamp: March 26, 2016, 06:53:36 am
content: 15R1. I didn't update to the new firmware because of some negative comments here.

author: tautech
author_rank: Super Contributor
timestamp: March 26, 2016, 07:33:28 am
content: Quote from: mojoe on March 26, 2016, 06:36:01 amThere've been some tweaks to LAN settings in FW 16R2, I've just installed it.IP address is still the same: 10.11.11.104Subnet Mask: same 255.0.0.0Third panel name and settings have changed to the expectedGatewayand new default settings are: 192.168.0.1These aren't mentioned in the changelog.
Keil Ulink2 - Page 1
Forum section: electronics / testgear

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: March 17, 2016, 07:05:44 pm
content: Anyone know if these actually work??? could be a scam, but I ordered onehttp://www.ebay.com/itm/271968030157

author: cio74
author_rank: Regular Contributor
timestamp: March 17, 2016, 09:40:49 pm
content: They work withinIAR WorkbenchuVision. I think Atmel Studio may also support it.What do you need it for?I would assume that you do know it's a Chinese copy and not the original thing.

author: adranp
author_rank: Regular Contributor
timestamp: March 18, 2016, 05:47:56 pm
content: These are not chinese copiesAfter buying myself one of these, I've found out that RealView is a brand that produces/sells under Keil Licensing (of some sort).These will work without issues as Keil Ulink2. (These even work under virtualised Windows OS running in VMWare Workstation/Fusion)One caveat is that they aren't fully populated with internal headers, but a few adaptors will help you change from 20 pin large header to whatever JTAG header you need.Good luck..

author: vzoole
author_rank: Regular Contributor
timestamp: March 18, 2016, 06:18:14 pm
content: It is work as original.As adranp mentioned the original is fully populated with connectors.

author: cio74
author_rank: Regular Contributor
timestamp: March 18, 2016, 06:39:56 pm
content: https://community.arm.com/thread/2234Alban Rampon 11-Sep-2013 11:56 (in response to sasa)Note: This was originally posted on 6th August 2012 athttp://forums.arm.comHello Sasa,Thank you very much for bringing this to our attention!I've been asked to remove the link from your post.The ebay listing is a counterfeit product.Therefore it's impossible to know what is in the box and if it is of any use.The ULINK2 is available from Keilhttp://www.keil.com/ulink2/And from distributors in the ARM Connected Community:http://www.arm.com/community/partners/Thanks,Alban

author: zapta
author_rank: Super Contributor
timestamp: March 18, 2016, 11:14:50 pm
content: I am using LPCXpresso with LPC Link2. Any advantage for switching to this Ulink2?http://www.digikey.com/product-detail/en/nxp-semiconductors/OM13054,598/568-10930-ND/4437858
Fluke 17B Knock-off, the Aimometer MS8217 - Page 1
Forum section: electronics / testgear

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 17, 2016, 01:07:35 pm
content: Came across this while browsing some other stuff. This is a knock-off with possibly a knock-off model number. The model number would lead you to believe that it is a Mastech MS8217, it might be but there are some significant differences between the Mastech and the Aimometer. All of these differences have been made to make the Aimometer look MORE like the Fluke 17B, this of course is assuming it is based on the Mastech MS8217 at all.The most interesting thing is that the 10A range fusing situation is quite special.They took the time to buy a fit a ceramic fuse, but strangely enough it is not in series with the shunt. The shunt, well shunts, directly between the 10A input and the common. The fuse appears to be on the line going to the IC!

author: ModemHead
author_rank: Frequent Contributor
timestamp: March 17, 2016, 04:58:36 pm
content: This awesome product has come up for discussion before:https://www.eevblog.com/forum/chat/blatant-copying-of-fluke/https://www.eevblog.com/forum/testgear/aimometer-ms8217-multi-meter-a-fluke-17b-clone/
Experiments and Teardown of the Teledyne LeCroy LabMaster 10-100zi 100GHz, 240GS - Page 1
Forum section: electronics / testgear

author: rx8pilot
author_rank: Super Contributor
timestamp: February 10, 2015, 06:24:43 am
content: This should be good.......!http://youtu.be/U3w_EWgGQukIt may fair better than the Analog Arts SL987 USB Oscilloscope

author: calmtron
author_rank: Regular Contributor
timestamp: February 10, 2015, 07:57:26 am
content: That RF deck actually looks messier than the Analog Arts SL987 boardGotta love RF plumbing!

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 10, 2015, 11:19:19 am
content: Quote from: calmtron on February 10, 2015, 07:57:26 amCalculated chaos!

author: wolf32d
author_rank: Contributor
timestamp: March 17, 2016, 04:40:19 pm
content: Quote from: rx8pilot on February 10, 2015, 06:24:43 am*mind blown*Wow, they down-convert 3 segments of the 0-100GHz band and sample each one at 80 GSa/s, then they up-convert and recombine everything in the digital domain! (did I get it right?)
Rigol DSA-1030 reviews / opinions? - Page 1
Forum section: electronics / testgear

author: papo
author_rank: Regular Contributor
timestamp: March 16, 2016, 07:06:19 pm
content: Hello everyoneI'm currently considering the purchase of a DSA-815 or maybe a DSA-1030. I came across excellent reviews on the Signal Path Blog but other than that, I'm having a very hard time to find reviews and opinions, even in this forum. This, or Shahrir's video was so good that everyone is thinking that he/she has absolutely nothing to add :-). It seems as if the DSA-1030 is not as popular as the DSA-815. This makes it hard for me to come to a conclusion. Is there anything wrong with the DSA-1030, maybe a reason not to go for it? Something that I don't quite understand is that the DSA-832 is way more expensive than the DSA-1030, even though the latter is supposed to have superior specs apart from the extra 200 MHz. I'm probably missing something obvious since I have only started looking, but what would be a reason to go for the DSA-832 as opposed to the 1030?Thanks and regardsMatt

author: Andy2
author_rank: Contributor
timestamp: March 16, 2016, 11:21:45 pm
content: Hi Matt.I have a DSA1030A-tg. It's a fairly nice instrument and works cleanly and without any issues as far as I can see. I bought it because my Signal Hound analyser was behaving badly due to terrible software, and it was a great relief to have a reliable analyser with good ergonomics in my shack.My only real quibble is the poor phase noise. Compared to my Signal hound (which is now working like a charm with new software), the Rigol is pretty poor, around 30dB worse. This makes the smaller RBW's (10Hz, 30Hz) almost redundant for narrowband work as the oscillator noise just fills in the cracks.Then there's the price - £5000 for a mediocre analyser is a bit steep really, even if it is less than a 'golden badge' instrument from one of the hallowed few.Now that my Signal Hound is working so well, I am tempted to flog the Rigol.

author: Ivan7enych
author_rank: Regular Contributor
timestamp: March 17, 2016, 10:17:27 am
content: Hi,I wanted to buy DSA-815, instead I've got SignalHound SA44, played with it for some time and replaced it with SignalHound BB60C, and I quite happy with it. BB60C has the same price as DSA1030A, and it has much better performance.BB60C has some drawbacks -gentle input SMA port (center pin is very tiny and soldered very gently to thin trace on a board, I've repaired it once),and a bit limited power range (+20dBm max, you should take care not to blow the input). In all other things it is much better than Rigol.Shahrir has a video about BB60C, so you can compare both reviews.
Question about Rigol DS1054Z and USB/PC  - Page 1
Forum section: electronics / testgear

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: March 15, 2016, 11:43:29 pm
content: I'm thinking about getting one of these units.Or something else. Hence the question.Getting data into and out of my PC is important to me. For example, I built this motor and it *ought* to be going at a certain RPM plus or minus 2 ppm. To verify I would like to download the hall effect sensor data that I collect using my new 1054Z, to the PC and just run a program on it.Is it possible?Can the PC display the same waveform as seen on the scope itself?Thanks,Randall

author: bitseeker
author_rank: Super Contributor
timestamp: March 16, 2016, 04:00:17 am
content: Quote from: RandallMcRee on March 15, 2016, 11:43:29 pmYou might find this helpful:http://www.teuniz.net/DSRemote/

author: ebastler
author_rank: Super Contributor
timestamp: March 16, 2016, 06:02:17 am
content: Quote from: bitseeker on March 16, 2016, 04:00:17 am... if you happen to run Linux.Actually, Sigrok sounds like a good (better?) match for your task. It is aimed at capturing and analysing data from multimeters and scopes. Sigrok has been around and actively supported for years, and should support the DS1000Z series nowhttps://sigrok.org/wiki/Rigol_DS1000Z_series. Disclaimer: I have not used Sigrok myself yet!

author: Karel
author_rank: Super Contributor
timestamp: March 16, 2016, 08:25:21 am
content: Quote from: ebastler on March 16, 2016, 06:02:17 amDSRemote runs everywhere. In the unfortunate case you are forced to use windows, you can run DSRemote in Virtualbox.https://www.virtualbox.org/

author: jeremy
author_rank: Super Contributor
timestamp: March 16, 2016, 08:27:49 am
content: I've got the data out of mine using python-ivi, using the driver built into the kernel in linux and using pyvisa via NI VISA.
ReMEMber to Upgrade your Bench - Keysight FREE Upgrade - Page 1
Forum section: electronics / testgear

author: FivePoint03
author_rank: Regular Contributor
timestamp: March 16, 2016, 08:05:15 pm
content: Hi,Just seen this - has anyone taken advantage of it?www.keysight.com/find/remember_bench

author: Short Circuit
author_rank: Frequent Contributor
timestamp: March 16, 2016, 08:42:44 pm
content: Yes
CRTU-RU input coupling - Page 1
Forum section: electronics / testgear

author: fchouza
author_rank: Newbie
timestamp: March 14, 2016, 05:58:04 pm
content: Hi! Someone knows if the input of the CRTU-RU is AC coupled or if it can manage DC inputs? I coudn't find it in the datasheet.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: March 14, 2016, 07:49:12 pm
content: Quote from: fchouza on March 14, 2016, 05:58:04 pmI don't have a CRTU-RU or CMU200 anymore but if I remember right the RF inputs were safe for DC up to 50V (built-in DC block).

author: fchouza
author_rank: Newbie
timestamp: March 16, 2016, 08:19:30 pm
content: Thanks for the hint! I couldn't find any reference and the high power port is only labeled with the max amount of power that it can handle (50W). Nothing about DC...
Someone has a TEK DMM830 MANUAL? - Page 1
Forum section: electronics / testgear

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: March 10, 2016, 09:14:38 am
content: I bought an used unit of TEK DMM830 but the manual didn't come.

author: boggis the cat
author_rank: Regular Contributor
timestamp: March 16, 2016, 05:56:29 am
content: Quote from: SAUL BRITTO on March 10, 2016, 09:14:38 amYou can download this which includes the specifications along with verification and adjustment procedures:http://www.tek.com/oscilloscope/dmm912-manual/handheld-instruments-technical-reference

author: kayvee
author_rank: Regular Contributor
timestamp: March 16, 2016, 06:04:03 am
content: Are you sure?QuoteI tried but the link does not work for me.Edit: Okay found it elsewhere, it does include the DMM800 series.Document title is: Tektronix Handheld Instruments Basic Service 061-4123-00
Frequency on Uni-T 61E and more Questions... - Page 1
Forum section: electronics / testgear

author: calli
author_rank: Regular Contributor
timestamp: March 14, 2016, 07:05:54 pm
content: Hi,I just bought a Uni-T 61E and it just came from Reichelt.de here in germany (yes :-).I played a bit with it, removed the lcd transport foil... Oh another one under it... removed that... OK clean up that glue remain... NO it is a scratch. Ok, not very visible but... I can live with it.More playing I thought I can try the Frequency metering. Put it on the wave form gen on my USB DSO (bitscope mini) and could measure a AC voltage, the switched with the YELLOW button to Hz. Nothing... Checked manual. tried again. Scoped, yes there is a signal.No frequency or % on the Volt or mV. Then tried the seperate Hz/% on the main knob. Measures perfectly. WHAT? The manual states freq is possible and the labels on the knob also indicate this. But nothing.... What do I miss?Cheers,Carsten

author: Wytnucls
author_rank: Super Contributor
timestamp: March 14, 2016, 08:34:43 pm
content: As the manual says, on AC Volt or AC Current selector position, the signal amplitude (RMS) must be above 30% of range to be able to show line frequency.

author: calli
author_rank: Regular Contributor
timestamp: March 14, 2016, 10:06:23 pm
content: Thanks @Wytnucls.I must have skipped that part in the manual ;-)And that Wave generator offsets only a small amplitude on a DC voltage. Bummer.Cheers,Carsten

author: calli
author_rank: Regular Contributor
timestamp: March 14, 2016, 10:26:37 pm
content: What should I expect from the PEAK button in AC Voltage? On a 9V AC wallwart it shows 10.4V (RMS right?) and PEAK Min -14V and PEAK Max +14V. Not what I would expect for practical measurements.Or anotherfor me?Carsten

author: Wytnucls
author_rank: Super Contributor
timestamp: March 14, 2016, 11:03:11 pm
content: I don't know what the waveform is like, so 10.4V RMS is possible and peak shows you Vpp (peak to peak) or transients. 14V peak is about right for a sine signal. 14/10.4 will give you the crest factor. 1.414, for a sine wave.You're unlikely to get accurate RMS values for a waveform with a crest factor above 3.

author: calli
author_rank: Regular Contributor
timestamp: March 15, 2016, 11:29:55 am
content: Ok, I took it for a Min/Max measurement.One thing I noticed in the manual is the wiring for current measurement is a good way to blow the fuse: Attachment.Carsten

author: Wytnucls
author_rank: Super Contributor
timestamp: March 15, 2016, 12:34:33 pm
content: Well spotted. The Chinese manual for the 61E has the same mistake.The manual for the 71 series, on the other hand, has it right with a resistor in series with the power supply.
Rigol DS1000Z add Signal generator mod - Page 1
Forum section: electronics / testgear

author: diawollo
author_rank: Newbie
timestamp: March 20, 2016, 08:10:50 pm
content: Lets start to discuss about DS1000z conversion to DS1000z -S. Can anyone tried to add signal generator daughter board?Is it possible to flash DS1000z -S firmware to DS1000z osciloscope?

author: TheSteve
author_rank: Unknown
timestamp: March 20, 2016, 08:30:08 pm
content: The firmware is the same - but where are you going to get the daughterboard from?

author: diawollo
author_rank: Newbie
timestamp: March 20, 2016, 08:45:32 pm
content: Quote from: TheSteve on March 20, 2016, 08:30:08 pmIt's a little secretI will reveal it someday, soon.P.S. If the firmware is same on both DSO then why on DS1000z there is no Signal generator icons? Maybe it will appear after inserting daughterboard?

author: ebastler
author_rank: Super Contributor
timestamp: March 21, 2016, 12:18:40 am
content: Quote from: diawollo on March 20, 2016, 08:45:32 pmHey, you are the one who claims to have a source for the daughterboard -- you better figure it out...Seriously though: You claim to have one part of the required solution, but are not telling us.But at the same time, you expect the forum to help you with the other part of the solution?!

author: bitseeker
author_rank: Super Contributor
timestamp: March 21, 2016, 07:05:29 am
content: Quote from: diawollo on March 20, 2016, 08:45:32 pmAh, so you've made a daughterboard for it? Excellent! Don't leave us in suspense too long.

author: TheSteve
author_rank: Unknown
timestamp: March 21, 2016, 08:39:58 am
content: Finding a nice way to add the front source button might be the most challenging part...

author: Fungus
author_rank: Super Contributor
timestamp: March 21, 2016, 01:27:46 pm
content: Quote from: TheSteve on March 21, 2016, 08:39:58 amDremel...?

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 21, 2016, 02:36:24 pm
content: Quote from: Fungus on March 21, 2016, 01:27:46 pmno need dremel or even the cheap dremel clone. just a paper cutter knife. the hole is already there nice and square.

author: TheSteve
author_rank: Unknown
timestamp: March 21, 2016, 03:34:21 pm
content: The hole is easy, you still a button though that hopefully doesn't look too ugly.

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 21, 2016, 03:47:57 pm
content: still, a paper knife with some dried silicon is the key. the rest is time and perseverance.

author: papousek
author_rank: Contributor
timestamp: March 23, 2016, 06:07:43 am
content: Interesting!i'm just wondering which to buy, Rigol DS1000Z or Siglent SDS1000X...
Vichy DM4070 LCR meter, any thoughts? - Page 1
Forum section: electronics / testgear

author: Vincent
author_rank: Regular Contributor
timestamp: March 06, 2016, 04:16:36 am
content: I've been considering getting an LCR meter for a while now. But having a limited budget for the time being, so are my options.So far one of the few sub-$100 models I found that doesn't look horribly cheap is the Vichy DM4070. Obviously I can't expect 0.001% accuracy out of such an instrument. But otherwise would it still be a good deal at $40?It's supposedly 2.5% accuracy for the capacitance and inductance measurements. Not sure if this would be accurate enough for RF or analog video circuits.

author: Tim F
author_rank: Regular Contributor
timestamp: March 06, 2016, 05:17:18 am
content: $40 sounds a bit steep for that functionality considering you can get a Der EE DE-5000 for $100. I had a similar one to the Vichy years ago and only paid $25. It served it's purpose I guess - I only wanted to wind my own inductors for loudspeaker crossovers. I have the DE-5000 now and couldn't imagine living without the parasitic measurements (ESR, etc) or the ability to set the measurement frequency.If you don't need a device that is so rugged you can find those cheap AVR based component tester 'kits' for around 10-15$us. Try searching "M238 ESR" on your favourite auction site.

author: markone
author_rank: Frequent Contributor
timestamp: March 06, 2016, 12:44:20 pm
content: Quote from: Vincent on March 06, 2016, 04:16:36 amDefinitely it's not, not even for audio frequency if you matter things like ESR,Q, D and to test components nearby their actual working frequency.Ideally you would need an RF LCR meter but if you are going to play with some DIY (as i think, otherwise you would not have posted like that) forget them and save the 40USD and go straight for DE-5000 as you have already been told.It's the minimum to start with.

author: 3141592
author_rank: Regular Contributor
timestamp: March 06, 2016, 02:29:27 pm
content: If you have a signal generator (a sound card might do as well) and a DMM with an ACV mode, you can get a ballpark figure for capacitance or inductance, and at least you can change the measurement frequency too. I wouldn't waste money on this Vichy, unless you need it for like sorting a lot of unmarked components or something. It's also important to test (or at least consult their datasheet) caps or inductors at the frequency and conditions at which they should operate, as things like frequency, DC bias, temperature can impact their performance substantially.

author: Vincent
author_rank: Regular Contributor
timestamp: March 16, 2016, 01:14:36 am
content: Turns out I came across a good deal on a GoldStar FG-8002 function generator, 60$ shipped to my door. Probably a much better investment I made.
Rigol DS 1102E oscilloscope is Crashing !! (2 min video) - Page 1
Forum section: electronics / testgear

author: Nayef
author_rank: Newbie
timestamp: March 14, 2016, 07:09:21 pm
content: Hi ,I uploaded a youtube video that describes the issue :please if some one has an advise or a solution to this problem.Thank you

author: Macman
author_rank: Regular Contributor
timestamp: March 14, 2016, 07:22:35 pm
content: The first thing I would do would be to check the power rails coming from the power supply. It could be as simple as one of the capacitors in the power supply failing.
Proper name for a twin 4mm banana cable - Page 1
Forum section: electronics / testgear

author: SKPang
author_rank: Unknown
timestamp: March 12, 2016, 11:25:48 pm
content: Does anyone know the proper name for a twin 4mm banana test cable called?Tried google it but all it come up with is the single cable version.Attached is a photo of the cable.

author: Richard Crowley
author_rank: Super Contributor
timestamp: March 12, 2016, 11:30:13 pm
content: When I Google for "dual banana plug" this is the very first hit....

author: PTR_1275
author_rank: Frequent Contributor
timestamp: March 12, 2016, 11:45:47 pm
content: Pomona 2ba or 2bcThe 2bc uses coax rather than a twin core wire

author: SKPang
author_rank: Unknown
timestamp: March 12, 2016, 11:47:43 pm
content: That is great. Many thanks.

author: PTR_1275
author_rank: Frequent Contributor
timestamp: March 13, 2016, 12:52:04 am
content: No problem. I had seen these in many of Dave's videos but want sure what they actually were.Google image search can be your friend here. Rather than searching through heaps of websites that are probably going to be the wrong thing, I now google "double banana plug" for example, go to image search and look through for the type I want. It helps to give you a whole lot of styles that you can then start to narrow down.I started doing it a while back, I was looking for a particular style of gopro mount but had no idea what it would be called. I tried searching for a few hours through various web pages, then thought about image search. About 5 minutes later it was located, ordered and on it's way.

author: timb
author_rank: Super Contributor
timestamp: March 13, 2016, 03:31:55 am
content: You can also make your own!Pomona 2970 Triple Banana PlugandPomona MDP Double Banana Plug. Those use set screws, but the MDP-ST has solder turret terminals if you want to go that route.I have a custom cable made up with a 2970 on one end and MDP on the other. I use high quality shielded twisted pair and attach the drain wire to the third connector on the 2970. So when I plug it into one of my precision power supplies, the cable's shield is connected to ground. Works great!
Anyone familiar with the HP 8690B sweep osc. and 8698B plug in? - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: March 13, 2016, 03:08:55 am
content: Buddy of mine gave me one of these, and I plan on using it. It seems to work, but the manuals that I have found do not cover the 8698B plug in, which covers 400khz to 110mhz.Anyone with a user/service manual for the 8698b would be greatly appreciated.
Differential Probe voltage derating with frequency? - Page 1
Forum section: electronics / testgear

author: Helix70
author_rank: Unknown
timestamp: March 10, 2016, 11:09:31 am
content: Hi,Looking at a 25Mhz Sapphire SI-9001 differential probe. The datasheet shows the voltage derating starts 1000V RMS from 3.5Mhz down to 150V RMS at 25 Mhz.My question is, if you are probing a 1Mhz flyback converter pulse train with a 50nS rise time, can you safely probe 1000V RMS or only 150V RMS?

author: Helix70
author_rank: Unknown
timestamp: March 12, 2016, 11:53:56 pm
content: Anyone?
Looking for Tektronix S-6 Users with Working S-6 Sampling Head - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: March 12, 2016, 03:43:26 am
content: I tried to get my S-6 working but no luck. It just dawned on me after looking at photos of various units that some are put together so that the push pin on the back is near the open round hole on the back, and some have the push pin opposite the open round hole - see examples of each below. Any chance if you have a working S-6 you could check to see which version you have?Also, it appears that in some cases the push pin lines up with the side that has the adjustment access hole; in other cases the push pin is on the other side of the case (opposite the side with the adjustment access hole).Just trying to figure out which orientation Tektronix intended....?Also, if you have a working S-6, does the back of your unit have the Tektronix writing, or is the writing absent?Thanks!
HP 3478A power supply whine? - Page 1
Forum section: electronics / testgear

author: mmagin
author_rank: Frequent Contributor
timestamp: March 11, 2016, 04:01:06 am
content: Does anyone else have a high-pitched (but line frequency modulated) noise coming from their HP 3478A when turned on? I listened around when I had it apart to change the battery, but I couldn't spot it. I tried using a piece of plastic tubing as an improvised stethoscope, but couldn't narrow it down to a single component. It's somewhere near the transformer though.It still works perfectly and has a 5 year old calibration, but it annoys me a bit, having sensitive ears.

author: bitseeker
author_rank: Super Contributor
timestamp: March 11, 2016, 05:58:13 am
content: I haven't encountered this on a 3478A. However, it's not uncommon for transformers or capacitors to generate noise. It's probably the transformer, but also check for capacitors that aren't glued down or may have come loose. That multimeter has been around for a few decades.I know what you mean about sensitive ears. CRT monitors were extremely annoying when they'd whine.

author: mmagin
author_rank: Frequent Contributor
timestamp: March 11, 2016, 08:08:49 pm
content: Yeah, it's odd, since I thought it wasn't a switching power supply, but maybe I need to take another look at the schematic.

author: bitseeker
author_rank: Super Contributor
timestamp: March 12, 2016, 12:01:49 am
content: As far as I know, it's not a switching supply. Something may be loose from age, a failing component might be causing an oscillation, or some of the "hot snot" may no longer be adhering to the board or component.

author: mmagin
author_rank: Frequent Contributor
timestamp: March 12, 2016, 01:01:42 am
content: Well, it's a lovely mystery, I think it may be time for me to get one of these:http://www.mcmaster.com/#1024t28/=11hz6nz

author: bitseeker
author_rank: Super Contributor
timestamp: March 12, 2016, 03:16:01 am
content: The doctor is in!
Unknown Rigol ID - Page 1
Forum section: electronics / testgear

author: cinbody
author_rank: Newbie
timestamp: March 11, 2016, 03:52:02 pm
content: Hello All,First time poster, long time lurker. Analog is not my strong suit, in fact I'mpretty much self taught everything but I'm more at home in digital.Does anyone recognize the Rigol scope in these images just by the screen?http://cdn.instructables.com/F2Q/IK83/HKBFBLSS/F2QIK83HKBFBLSS.LARGE.jpghttp://cdn.instructables.com/FFT/F562/HKBFH06T/FFTF562HKBFH06T.LARGE.jpghttp://www.instructables.com/id/Real-time-Radiation-Detector-Scintillino-test/?ALLSTEPSBeen thinking of upgrading my Leader LBO-515B scope, this instructable has some elements I may integrateinto a project. I have read here and elsewhere that the ds1054z is a great value and I'mwondering if that's what's being used by this guy (put another way, can the ds1054z handle50 ns / div as pictured?)Thanks in advance, Chris

author: alsetalokin4017
author_rank: Super Contributor
timestamp: March 11, 2016, 06:46:44 pm
content: That's not a DS1054z, which has a much nicer looking display than that.The DS1054z's horizontal timebase goes down to 5 ns/division. So yes, it can handle 50 ns/division.There are several threads on this forum talking about various features, etc. of the Rigol DS1054z scope, and Dave has a couple of videos about it as well.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: March 11, 2016, 06:47:12 pm
content: Quote from: cinbody on March 11, 2016, 03:52:02 pmThat's the old Rigol DS1000 Series (no 'z' at the end!) from 4 years ago:The DS1000z Series is newer, and has a much more modern UI.

author: ebastler
author_rank: Super Contributor
timestamp: March 11, 2016, 06:48:13 pm
content: Not sure which Rigol scope is shown in the screenshots, but it is definitely an older, and probably much more basic model than the DS1054Z. The fastest time base of the DS1054Z is 5 ns/div, so it will certainly be more than adequate to capture the signal shown.

author: cinbody
author_rank: Newbie
timestamp: March 11, 2016, 07:02:59 pm
content: Ya'll rock, tyvm.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 11, 2016, 11:34:52 pm
content: Quote from: Wuerstchenhund on March 11, 2016, 06:47:12 pmWuerstchenhund got it! Before the DS1054Z line came out, there was the DS1052E line. This line was the first line that Rigol released independently. It shares a LOT with the Agilent/Keysight DSO1000 series, because Rigol is the manufacturer for that series. Agilent/Keysight more or less trained them on what they know.
AD584 startup problems - Page 1
Forum section: electronics / testgear

author: jimmc
author_rank: Frequent Contributor
timestamp: March 14, 2016, 08:07:08 pm
content: I've been playing with a cheap AD584 module (the one with four double links to set the output) and found an interesting problem.When first powered up from a bench power supply, the module worked normally (set to 10v), changing to a LM78L15 based supply the output would rise to 2v and then very slowly rise to about 4v when it would jump to 10v.Subsequent restarts were OK even after several minutes powered down. Discharging all the capacitors on the module caused the problem to reappear.The problem appeared to be caused by a relatively large capacitor (330nF) fitted between pins 6 & 7. The data sheet suggests 10 to 100nF. I replaced the cap with 22nF which appears to have cured the fault.Has anyone else seen this behaviour?Jim

author: lars
author_rank: Regular Contributor
timestamp: March 14, 2016, 08:14:41 pm
content: Yes I have two of these and both have the same behaviour. After it has reached 10V I see no problem. The outputs have been within 20ppm from stated value (at specified temperature) the last months (unpowered most of the time).Lars
HP 3562A F/W and board versions... - Page 1
Forum section: electronics / testgear

author: Turbon
author_rank: Regular Contributor
timestamp: March 11, 2016, 12:10:18 pm
content: Hi.Is there a matrixsheet showing what the latest firmware was for the Rev-D CPU board?Are there any information about F/W versions or is this kind of information lost?Regards
HP 6002A Power Supply - Page 1
Forum section: electronics / testgear

author: mos6502
author_rank: Frequent Contributor
timestamp: March 10, 2016, 02:08:03 pm
content: These seem to be really cheap on eBay, especially compared to other HP power supplies. Is there a catch?

author: macboy
author_rank: Super Contributor
timestamp: March 10, 2016, 05:31:38 pm
content: Other than potentially high shipping costs (looks big and heavy) I'd say there is no reason not to go for it. It is a very versatile power supply, offering up to 50 V and 10 A in any combination up to 200 W. Since those are typical HP conservative figures, feel free to add ~ 20% to each (e.g. I have a very similar HP 6286A "20 V 10 A" supply that happily does 24 V @ 12 A all day long). This one has remote sense connections (on the back) and remote programming capability, common in these older analog supplies. Averysignificant plus is that the service manual complete with theory of operation, performance verification, calibration, troubleshooting, and all-important schematics is freely downloadable.

author: nctnico
author_rank: Super Contributor
timestamp: March 10, 2016, 05:54:57 pm
content: I have one but I'm not using it anymore. First of all these are really old. I think I have owned mine for more than 20 years and it was already old when I got it. Secondly they have a noisy fan so I put a temperature control circuit between the fan in mine. When I got it (20 years ago) it needed some repairs and back then I already noticed the wires which are soldered into the boards detached themselves very easy (a little bit of wiggling was enough) so I resolderd all the wires going into the boards. I recommend doing the same on every 6002A!

author: mmagin
author_rank: Frequent Contributor
timestamp: March 10, 2016, 08:45:22 pm
content: It's really heavy, and the fan is kind of loud.On the other hand, the output is quite clean, and it can provide a nice range of voltage and current for a linear supply. Also, unlike some of the other HP supplies of that era, you get a voltmeter and ammeter simultaneously. And it's from the era when HP still made things that lasted forever and weren't hard to service.I got one cheap off ebay a while ago, and the seller (or maybe his helper?) just put it in a box with no packing material!!!Amazingly, the only things wrong with it were two broken binding posts, a broken plastic nut holding the power switch, and some cosmetic denting around the rear panel. Got a partial refund and fixed it up pretty easily.Haven't done anything but fix the physical damage, I need to test the ripple under load, but the stability of the voltage setting seems to be really good (stayed at a reading of 50.007 on my 3478a for several minutes, hadn't even been warmed up much when I set it to that.)P.S. I thought the fan was loud due to failing bearings, but I bought a new fan of equivalent specs and it was just as loud. It just moves a lot of air across a big heatsink!