hybridfree/eevblog-posts huggingface dataset:
Small signal on an OWON SDS-E - Page 1
Forum section: electronics / testgear

author: gildasd
author_rank: Frequent Contributor
timestamp: December 16, 2015, 10:14:26 pm
content: Hello,I used an Owon SDS-E today, and found that one of my circuits has an annoying "quirk":A 555 timer causes a regular "spike" when it "switches".It's about +20mV and -20mV.I think it's every 30uS.On the 30MhZ scope, even captured at max resolution, the spike is never more than a single pixel wide for both up and down.This should not be problem, but it "leaks" into my opamps via the -Vcc...And is spread out to creates a nice "heart beat" at the same exact frequency.Sorry for the lack of screen capture, I had to vacate the class before I could...What could be it's duration so could calculate a filter via C*R=T if not to remove this, at least tone it down?And the real question, my personal Philips scope (15Mhz analogue), the school's Tectronics (20Mhz digital) both failed to see the original signal and let me trace it down.so in basic scopes, which one could "see" this well enough to be able to work on it?It won't be a Owon because it's low voltage measurements are not good for my use:For example, it was steadfast indicating 32mV on a signal that two 175's, a UNI-T61, and two Tectronic scopes were indicating as 9mV...Changing channels and using 4 different probes all gave me the same results.
Rigol RP3300A probes, 300 or 350 MHz? - Page 1
Forum section: electronics / testgear

author: awallin
author_rank: Frequent Contributor
timestamp: December 14, 2015, 03:54:36 pm
content: These two came with a DS2072A. Both are model RP3300A, with '2012' on the spec-sheet, but one is DC-350MHz and the other DC-300MHz. Whiskey Tango Foxtrot!?

author: markce
author_rank: Regular Contributor
timestamp: December 14, 2015, 10:51:50 pm
content: Spec-sheet of a RP3300 (non-A) ?

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: December 15, 2015, 07:55:12 am
content: I ordered a DS2072A a little over a year ago, both of the probes that came with mine are the same RP3300A, with the spec sheet identical to the one on the right. Both have the 2012 date on the front. I wonder if thats just a typo, or maybe they test all the probes and some are just a little better than others and they put the measured frequency on the spec sheet after they've been measured. I doubt it, probably just a typo.Edit: How close are the serial numbers?

author: awallin
author_rank: Frequent Contributor
timestamp: December 15, 2015, 08:02:43 am
content: Here's the front side of the spec-sheets.I only have one plastic bag with the serial RP3A317157262 left - sorry the other one went in the trash
HP8648C Acting Up? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: December 15, 2015, 05:44:39 am
content: After completely normal operation the 8648C turned on with a display that says "5 second self test" - which would be fine if it didn't say on for about 10 minutes. After about 10 minutes I heard a relay click and the normal display came up but none of the buttons seemed to cause normal actions. Power cycling it has put it back into the "5 second self test" mode again.Below is a snippet from the manual. It talks about the GPIB but there is nothing attached to that....Any idea what might be up and how to fix it? Thx

author: Electro Fan
author_rank: Super Contributor
timestamp: December 15, 2015, 06:44:45 am
content: Update: I think the 10 minute interval might have been somewhat longer - but when it happened again I hit the local button and the Sig Gen returned itself to normal. Maybe I got it into the non-local mode and there was no good way to get it out since the GPIB isn't in use? Anyway, it's back to normal.My theoryis that that it knew I was checking with the guys on EEVblog - and it decided it was about to get fixed one way or another - so it decided to go back into normal operation. Kind of like when someone calls IT for support and the IT guy shows up and everything is running fine. These boxes can sense when they are going to get fixed so sometimes they just give up and behave.It wasn't operator error, honest.

author: tautech
author_rank: Super Contributor
timestamp: December 15, 2015, 06:58:55 am
content: Quote from: Electro Fan on December 15, 2015, 06:44:45 amYeah right.
Spectrum Analyzer Noise Floor Rise at 2.9GHz - Is it Normal? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: December 15, 2015, 05:13:58 am
content: Just checking to see if it is normal for an HP8561E (9kHz - 6.5GHz) to have a noise floor rise at about 2.9GHz? If so, how much? 3dB? Less? If it's normal (or not), is there a way to minimize the step up?

author: KE5FX
author_rank: Super Contributor
timestamp: December 15, 2015, 05:18:59 am
content: Yes, it's switching bands internally. The IF gain has to come up a bit to compensate for the extra front end loss of the preselector.

author: Electro Fan
author_rank: Super Contributor
timestamp: December 15, 2015, 05:39:00 am
content: 3dB is ok?

author: KJDS
author_rank: Super Contributor
timestamp: December 15, 2015, 05:42:33 am
content: That looks normal to me.

author: MadTux
author_rank: Frequent Contributor
timestamp: December 15, 2015, 05:45:31 am
content: Harmonic mixer in action. I'm not exactly sure why that happens, but I think it's because the higher harmonics have less power than fundamental, so less mixer driving signal => more noise. The 1th mixer sees fundamental and all harmonics at once, since the frequency selection only happens in the front end (YIG tuned filter).Anyway it's usually a sign that the SA works as it should. See 8566 as example, it uses baseband, 2th, 3th and 4th harmonic, thereby 4 steps in 2-22GHz sweep:http://www.sglabs.it/public/SgLabs_HP_8566B_1.JPG

author: TheSteve
author_rank: Unknown
timestamp: December 15, 2015, 06:16:51 am
content: Looks pretty normal, here is a full sweep with an 8563E:

author: Electro Fan
author_rank: Super Contributor
timestamp: December 15, 2015, 06:29:31 am
content: Quote from: MadTux on December 15, 2015, 05:45:31 amYes, I noticed it is fairly pronounced in various photos of the 8566 - that made me feel better since I think that is like the Daddy or Grand-Daddy of the 856XE series
Need a manual for a Wavetek model 680 multifunction system.  - Page 1
Forum section: electronics / testgear

author: highlux
author_rank: Contributor
timestamp: December 14, 2015, 01:26:16 am
content: I know its a longshot...but I'm desperate to find the manual. I see one on ebay...but would love the pdf.ThanksDave

author: tautech
author_rank: Super Contributor
timestamp: December 14, 2015, 02:38:08 am
content: Some info that may help you track down the manual/s you needhttp://www.eetimes.com/document.asp?doc_id=1141089Google searches show it be a modular system but are you just after manuals for some of the components?All the good ones I know of:http://www.schematicsunlimited.com/w/wavetekhttp://www.opweb.de/en/manufacturer.php?manufacturer=Wavetekhttp://www.manualslib.com/brand/wavetek/http://www.ko4bb.com/manuals/index.php?dir=WavetekEditSystem and its description can be viewed here:http://www.atecorp.com/products/wavetek/680-01.aspx

author: highlux
author_rank: Contributor
timestamp: December 14, 2015, 02:02:01 pm
content: OK...I googled all that too. Why I appreciate your efforts there....what I need is the manual.So....does anyone have a link to the actual pdf of the 680 manual?
Changing out a Tektronix 7000 Plug-in Pull Tag - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: December 14, 2015, 09:08:18 am
content: I'm trying to remove a pull tag from a plug-in that is out of order so I can use the pull tag in another plug-in that is working (I think) but is missing the pull tag.The pull tag head (with the Tektronix 7XXX number on it) seems to be connected to the horizontal nylon piece (that connects to the spring that attaches to the bottom of the plug-in) with a small metal part - it looks like it is just pressure fit into the cylindrical hole and could be pushed out of the top or bottom of the hole with a small tool - which would then release the pull tag head from the horizontal nylon piece - and allow the whole thing to be removed from the plug-in.Before I mung it up trying this approach I thought I'd check with more experienced plug-in owners.Thx
UNI-T UT61E Continuity on Car Battery and AA cell. (Moved to Beginners) - Page 1
Forum section: electronics / testgear

author: Neelar
author_rank: Newbie
timestamp: December 13, 2015, 05:48:23 pm
content: This topic Moved to Beginners.

author: mzacharias
author_rank: Frequent Contributor
timestamp: December 13, 2015, 06:42:27 pm
content: I think this is normal operation for this meter. The battery is essentially a very low impedance.

author: DG5SAY
author_rank: Contributor
timestamp: December 13, 2015, 06:59:24 pm
content: Quote from: Neelar on December 13, 2015, 05:48:23 pmI suggest to move this topic to the "Beginners"-Forum.

author: SeanB
author_rank: Super Contributor
timestamp: December 13, 2015, 07:08:24 pm
content: Continuity, and resistance, along with diode terst, are meant only to be used on an unpowered circuit. The ranges are not designed to be used with power present. If you are trying to measure the resistance of a battery you need to select the voltage range, and apply a known load ( a resistor or lamp) and then measure the voltage unloaded, then the voltage with a lod, and measure the current draw separately, then calculate using those values. You cannot measure them directly.
Rigol DS1054Z Cursor Position Error - Page 1
Forum section: electronics / testgear

author: alsetalokin4017
author_rank: Super Contributor
timestamp: December 14, 2015, 09:15:45 am
content: Grr.I was doing some checking of scope math and the results from manual calculations using Cursors didn't quite jive with the scope's automatic Measurements. Looking more closely it seemed that the Cursor positions were being reported a little off. So I checked it out without any waveforms on screen to complicate matters. See the screenshot below for the errors in the Vertical Cursors (horizontal lines measuring vertical values). The CH1 baseline marker is exactly on the screen centerline (0.000V offset) and the Cursor B is also positioned right on this line, so it should be reporting 0.000 V but it actually reports -100.0 mV. The Cursor A is positioned exactly on the -10V line but the position is reported as -10.20 V.This is right after running a Self-Calibration routine, too. And I get similar results from using other channels and different vertical scales. The Cursor positions are reported incorrectly! Not by much you might say, but enough to throw off calculations by a significant amount.

author: TomThomas
author_rank: Contributor
timestamp: December 14, 2015, 01:16:41 pm
content: Hey....what about:5V/div * 8div =40V40V/2^8bit = 156.25mV/bitHow should the scope measure more accurate?RegardsThomas

author: dcac
author_rank: Frequent Contributor
timestamp: December 14, 2015, 04:22:43 pm
content: @alsetalokin4017Yeah there seem to be a (small) vertical scaling/offset error between the graticule and the cursor values.Here I've ground coupled CH1 and pressed vertical position to set GND reference at 0V and this matches exactly with the graticule center line, set Trig level to -15.0V and this also matches the graticule perfectly.But cursor A which is exactly on top of the GND line reports -0.100V and cursor B which is exactly on top of the Trig line reports -15.20V.So cursor A has to be moved 1 pixel up to show 0V, and cursor B moved 2 pixels up to show -15.00V, but then they no longer matches the graticule exactly.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: December 14, 2015, 10:19:53 pm
content: @dcacThanks for checking. It seems that this is not just my scope then.@TomThomasIt's not so much the lack of precision due to the 8-bit ADC, it's the lack of agreement between the Cursor's reported _position_ and what the scope's Measurements come up with, or where the Cursor is actually located.Try giving the scope a DC signal and use the Measurements to report things like Peak and Average voltages. Then put the Cursor on the trace and see if the reported Cursor position agrees with the Measurements. If the issue was merely the precision of the ADC, one might expect that the Cursor value would still agree with the Measurements if the Cursor is in the same place as the trace. But it doesn't.
Anritsu MS8609A Is it possible to install the software options? - Page 1
Forum section: electronics / testgear

author: MarioFly
author_rank: Newbie
timestamp: December 13, 2015, 09:34:19 am
content: Possible Measurement software:MX860901B- W-CDMA Measurement SoftwareMX860902A - GSM Measurement SoftwareMX860903A - cdma Measurement SoftwareMX860904A- cdma2000® 1xEV-DO Measurement SoftwareMX860905A - ?/4DQPSK Measurement SoftwareMX860920A - BER/BLER Measurement Software (requires MU860920A)MX860930A - Wireless LAN Measurement SoftwareMX860950A - HSDPA Measurement SoftwareI have a PC card with the following softwareMX860901BMX860904AIs it possible to install the software MX860930A (Wireless LAN Measurement Software) ?Installing measurement software, page 20. (size 1MB)https://www.dropbox.com/s/hoak02buasbplu0/MS8609A_EE2200.pdf?dl=0or page 55-58 (size 5MB)https://www.dropbox.com/s/jehvhbhwt9lktkz/pi_4_dqps_soft_opm_e_5_0.pdf?dl=0For the purchase of this option, I have to work for about 4 years.I am a radio amateur and did not engage in any commercial activity.Hope for understanding.
Fluke 87 protective holster needed - Page 1
Forum section: electronics / testgear

author: YU2
author_rank: Regular Contributor
timestamp: December 11, 2015, 06:44:03 pm
content: I got Fluke 87V as a present but it does not have a holster. Does anyone maybe have one spare or know where I could find it?

author: Fungus
author_rank: Super Contributor
timestamp: December 11, 2015, 07:51:51 pm
content: http://www.fluke.com/fluke/inen/products/category?category=acc_case&parent=accOr if the official ones are too expensive:http://www.ebay.com/sch/i.html?_nkw=multimeter+case

author: retiredcaps
author_rank: Super Contributor
timestamp: December 11, 2015, 07:58:54 pm
content: Fluke sells the holster.http://www.fluke.com/fluke/caen/accessories/cases-holsters/h80m.htm?pid=56254Ebay sellers also sell the above holster or the older style (my favourite). Just an example below. I have no affiliation with the seller or ebay.http://www.ebay.com/itm/262183606476

author: YU2
author_rank: Regular Contributor
timestamp: December 12, 2015, 06:57:41 am
content: That ebay seller does not ship to my country. On Fluke official page I see no price, but I'm sure it's way more than I can afford to pay.

author: retiredcaps
author_rank: Super Contributor
timestamp: December 12, 2015, 07:25:12 am
content: Quote from: YU2 on December 12, 2015, 06:57:41 amSee screenshots for that seller.You asked where you could buy one, but did not specify a price, so don't complain about shipping prices, exchange rates, tax/duties, etc.

author: Fungus
author_rank: Super Contributor
timestamp: December 12, 2015, 01:55:56 pm
content: Quote from: retiredcaps on December 11, 2015, 07:58:54 pmOh, you mean the "shoe"...I thought you were after a carrying case.

author: YU2
author_rank: Regular Contributor
timestamp: December 12, 2015, 02:15:21 pm
content: Quote from: retiredcaps on December 12, 2015, 07:25:12 amMy country is not on the ebay global shipping program list and that seller does not ship to my country. Hope it clarifies things to you.
Nida Trainer Model 207 Oscilloscope - Not Working - Page 1
Forum section: electronics / testgear

author: mrnateytatey
author_rank: Newbie
timestamp: March 19, 2014, 07:03:26 pm
content: Excuse me but I am 14 and don't know very much about oscilloscopes. Ive have this oscilloscope ( Its a NIDA Trainer Model 207) in my possession and got it for about 20 US$ a few months ago just about half of that time it started showing A single dot in the middle bouncing around. It does nothing even after putting a known working source into it it does nothing. Please Help!I don't know what happend

author: rbrown044
author_rank: Newbie
timestamp: December 11, 2015, 09:13:07 pm
content: Greetings mrnateytatey,I don't suppose you want to sell that trainer for $20? O0I am a student at a technical college and we use the Nida Trainer Model 207 that you have. We're issued a Trainer Manual, as well as a Trainer Workbook with experiments. Basically the device you have (and the printed material I have) was designed to be used to better understand HOW oscilloscopes operateFirst in understanding the basic theories, controls, components, features, signal path(s) and how they all coexistEssentially the end result is being able to take measurements from different points within the machine and identify where the trouble is originating fromI would suggest trying to get your hands on the Training Manual and/or the workbook. The workbook we use is rife with errors, but perhaps Nida has some updated materials you can get your hands onSincerely,rbrown

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 11, 2015, 09:21:32 pm
content: Quote from: mrnateytatey on March 19, 2014, 07:03:26 pmWelcome to the forum! How is the dot bouncing, horizontal, vertical?Can you make a better picture of the front panel so we can see the settings?

author: onlooker
author_rank: Frequent Contributor
timestamp: December 11, 2015, 09:55:57 pm
content: The NIDA Trainer Model 207 I have had the same problem from time to time. The cause was that all the transistors were socketed and it can form bad contacts, especially, after it set in the shelf for some time.I used to wiggle the transistors in the oscillation circuitry (and other parts). When I got tired of opening the case (easy to open, heavy to flip), I started to just knock the case a few times and/or wait it to warm-up.If you try to open the case, just be very careful about the high voltage circuity in there.It was my first scope and I bought it 2nd hand a long time ago (for $100?). I have not touched it for a long time too. I think the BW is about 5MHz or less.
Cheap LCR/ESR tester instructions ? - Page 1
Forum section: electronics / testgear

author: aneng
author_rank: Regular Contributor
timestamp: December 11, 2015, 08:39:32 am
content: Hi, I've bought one of these things off eBay......and I know it's pretty obvious how to use it, but I was wondering if anyone had a manual for it ? I'm puzzled what the 'KAA' markings are on the ZIF connector - and if I connect any components there, it gives me odd results - e.g. a resistor was detected as a zener, but detected correctly when I used the other (not 'KAA') sockets.Any ideas ?

author: crispy_tofu
author_rank: Super Contributor
timestamp: December 11, 2015, 09:02:42 am
content: Might be helpful:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/Could it be kathode/anode?
EDC MV-100j schematic/SM where to find? - Page 1
Forum section: electronics / testgear

author: rigrunner
author_rank: Frequent Contributor
timestamp: December 11, 2015, 04:48:25 am
content: Has anyone located the service manual or schematic for the EDC MV-100j voltage standard?I've picked one up and would like to run through the service manual to check everything is ok with it.
Fluke 2165A Thermometer - Page 1
Forum section: electronics / testgear

author: Homer J Simpson
author_rank: Super Contributor
timestamp: January 19, 2013, 12:16:38 am
content: Picked this up off Ebay for $25. Came with a type J thermocouple.Has the battery option. Uses 4 D NICAD's in the black battery holders.25+ years old and still right on.Got this primarily to monitor board temps during hot air work. Also, heat sink temps, ect.I found the operators manual on line but have not been able to find the service manual. If any one has one or a link please let me know.KT

author: kalinrs
author_rank: Newbie
timestamp: December 10, 2015, 01:52:13 pm
content: Sorry to revive this after 3 years, but were you able to find a service manual / schematics?I have one as well and it is not behaving very well.Anyone?Thanks
Hantek pps2320a power supply - Page 1
Forum section: electronics / testgear

author: DrMatsci
author_rank: Newbie
timestamp: February 17, 2014, 12:25:41 am
content: HI I am new to this forum so please forgive me if I seem to be wasting your time.I Have a Hantek pps2320a linear power supply and need help on how to set it up for split rail operation.Can I just short out the Ch1 Neg to the Ch2 Pos and use that as my common ?Also what mode should I put it in Tracking or Independent mode ?Thanks for any help you may provide and I hope I can contribute to this forum in a good way !

author: rdl
author_rank: Super Contributor
timestamp: February 17, 2014, 12:39:31 am
content: You have to select Series mode. Channel 2 negative is negative, Channel 1 negative is common, and Channel 1 positive is positive.Here is a link to an operating manual:https://www.circuitspecialists.eu/index.php/lanotattachments/download/file/id/72/store/1/csi2320a_manual.pdf

author: pickle9000
author_rank: Super Contributor
timestamp: February 17, 2014, 01:06:08 am
content: This is off topic but is Hantek a manufacturer or a rebrander?

author: rdl
author_rank: Super Contributor
timestamp: February 17, 2014, 01:15:42 am
content: Hard to say, they talk a lot about designing and providing, but no mention of manufacturing that I saw. Maybe they have their stuff made for them.http://www.hantek.com/en/index.html

author: DrMatsci
author_rank: Newbie
timestamp: February 17, 2014, 01:48:29 am
content: Want to say a Big Thank you to RDL for the help.Test that confirgurtion out for split rail use on my Hantek works just Fine !!!!!And a Big Thanks Again !!

author: pickle9000
author_rank: Super Contributor
timestamp: February 17, 2014, 01:53:47 am
content: @rdlCertainly looks like they manufacture (at the very least they design their own stuff) if you look at the human resources page.http://translate.google.ca/translate?hl=en&sl=zh-CN&u=http://www.hantek.com/en/HumanResources.html&prev=/search%3Fq%3Dhttp://www.hantek.com/en/HumanResources.html%26client%3Dfirefox-a%26hs%3D24t%26rls%3Dorg.mozilla:en-US:official

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: December 09, 2015, 10:10:04 pm
content: Its a OEM product.Note: Due to the huge success of this product, Circuit Specialists now markets it under our own brand instead of the Hantek brand. This is the identical product from the identical original manufacturer. Hantek was not the original manufacturer of this item and was remarketing it under their label.refhttp://www.circuitspecialists.com/hantek_pps2320a_power_supply.htmlErik
Environmental tests - Page 1
Forum section: electronics / testgear

author: Boomerang
author_rank: Regular Contributor
timestamp: December 14, 2015, 09:58:03 am
content: I have questions for the people who need to test their designs in different temperatures and/or humidity: how do you test your board or devices - do you own a environmental chamber or you rent for some test sessions or you go to a lab to test? What is the best option for you personally? Do you need to test for humidity or you test only for temperature?

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 14, 2015, 12:24:34 pm
content: We have a few options for environmental tests. The most extreme does vibration, temperature, and humidity. It cycles through these several times. It takes a few hours.Here are the types of failures we find:1. Humidity is usually taken care of by conformally-coating every board.2. Only a few things go wrong at low temperatures. Usually not much worse than contrast changes on LCD displays.3. Several things can go wrong at high temperatures:- LCD contrast changes- High-load devices can go into thermal shutdown- Devices can have odd behavior4. Vibration can rip large components right off the boards. Usually fixed by using epoxy when manufactured.Some real odd ones can show up. I had a diode soft-short at high temperatures, which caused another component to burn up. It took about a week to figure that one out.
WAYNE KERR 7010 manual, specs or knowledge? - Page 1
Forum section: electronics / testgear

author: murrayatuptown
author_rank: Contributor
timestamp: December 11, 2015, 05:30:54 am
content: Hello:I am looking at a Wayne Kerr 7010 high speed component (LCR) analyzer.It is listed on their website only in their chart of product development by decade (90's).For some reason, information on this model is extremely elusive.There website has a manual electronic copy request link with a day processing time. I've emailed them twice in a week with no response at all, not even a declination, to date.I can vaguely assume the parameters it measures by looking at the front panel, but there are too many questions unanswered with no documentation available.Is anyone familiar with it, have a manual, specs, or have an idea why it seems to be so scarce online? They have older models info can be easily found for.The back panel has interconnection for GPIB and a 'handler'. Best I can assume, the handler is a component tray, tube, sorter or other carrier that facilitates the high speed automated measurement implied by the description.ThanksMurray
Seriously stinky Tektronix Probe. - Page 1
Forum section: electronics / testgear

author: jwm_
author_rank: Frequent Contributor
timestamp: December 09, 2015, 05:41:05 am
content: Okay, now, I know that vintage equipment has a distinct "smell". I have always been fine with it, makes me feel nostalgic, even the Shenzhen scent of ebay orders isn't bad and dissipates quickly but now I find myself dealing with a different beast.I recently got a deal on a Tektronix p6046 differential probe, I giddily opened the box and... whew. It stank. I mean.. I became nausious. It is like the vintage equipment smell turned up to eleven and mixed with what i can only describe as the smell of 'rotting organic plastic' if that is a thing. The odd thing is, it all looks okay, no mice accidentally wrapped into the transformer, plastic not crumbling, just normal yellowing, my very brief tests seem to indicate it probably works, but i had to physically put it in the other room after about 10 minutes to avoid feeling sick.I left it overnight open, hoping it would air out, but the next day i picked it up and immediately started to dry heave. No reduction in scent. My question is, what the hell is this? Has anyone encountered it before, I have much older tektronix and other gear that has aged just fine, has my differential probe entered some new phase of decomosition? Has a new strain of differential probe eating bacteria evolved?So. any ideas? Has anyone else dealt with stinky probes? I'd feel like such a wimp if I had to give up using a perfectly cromulent differential probe due to its smell, but I can't handle using the thing. Any ideas on how to clean it without destroying it? I am not sure what solvents are safe on gear of this vintage, or if they will even help if it is some fundamental part of the probe decaying.It may end up in a mailbag to Dave if I can't get the thing cleaned somehow, given his experience with vintage gear he can probably take one whif and narrow down the the serial number to within a few hundred or so.John

author: MadTux
author_rank: Frequent Contributor
timestamp: December 09, 2015, 06:02:49 am
content: According to amplifier.cd, it's the transformer wire isolation inside the PSU:http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/P6046.htmThe polyurethane foam inlay in the blue box in which the Tek-probes are stored, turns also nasty and gooey as it gets old. Could also cause some nasty smell.My mailbox also likes nasty probes and I even have time and motivation to clean them
Tektronix 7T11 vs 7T11A for 7904 - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: December 09, 2015, 10:50:52 pm
content: Anyone know the differences between the 7T11 and 7T11A?For use in a 7904 (not 7904A) with a 7S11 and various combinations of S2, S4, or maybe S6

author: dom0
author_rank: Super Contributor
timestamp: December 09, 2015, 11:12:25 pm
content: http://www.perdrix.co.uk/7T11Conversion/index.htmQuote

author: PA2HK
author_rank: Contributor
timestamp: December 09, 2015, 11:14:48 pm
content: For use in a 7904 or 7904A mainframe there is no difference between a 7T11 or a 7T11A, both will work. The difference between a 7T11 and 7T11A is only relevant for the usage in a Tek 7854 mainframe, change is a difference in the blanking circuit that make a 7T11(non A) not to work in a 7854.edit: too late :-)
Rigol DS1074Z sample rate and mem depth limit - Page 1
Forum section: electronics / testgear

author: eyal
author_rank: Contributor
timestamp: December 08, 2015, 01:28:52 pm
content: I had this DSO for a few months and I notice that under all conditions I never see a "Sa Rate" above 500MSa/s or a "Mem Depth" over 6M. It is supposed to do 1GSa/s and a depth of 12M (without options).This is with one channel enabled and no averaging etc.I now installed the latest fw and this did not change.Model:DS1074ZBoard Ver:0.1.1Firmware Ver:0.2.3.11BOOT Ver:0.0.1.2CPLD Ver:2.3SoftWare Ver:00.04.03.SP2Interestingly, this is the case with a single channel 1, 3 and 4. However ch2 does not have this limitation. What gives?I searched this forum and scanned the bugs/wishes but did not see this mentioned (but maybe I missed it).TIA

author: Orange
author_rank: Frequent Contributor
timestamp: December 08, 2015, 02:21:09 pm
content: When you select CH1, you also need to set the trigger source to CH1, if you leave that on CH2, it does only 500Ms/s

author: Fungus
author_rank: Super Contributor
timestamp: December 08, 2015, 02:57:38 pm
content: Both values are affected by the memory depth option under the 'acquire' menu (press the "Acquire" button).The sample rate goes down at lower memory depths.Have a fiddle with that setting.

author: eyal
author_rank: Contributor
timestamp: December 08, 2015, 10:38:25 pm
content: Thanks @Orange, you are correct. Selecting AC as the trigger source allows all channels to sample at 1GSa/s with a depth of 12M. I can see how it needs to use a comparator (or the ADC) but I did not expect the trigger to need half the memory. I guess the design is hardwired to store each sample even when it is not required (or is there a way to display the trigger trace, AC in this case?).
Agilent DSO-X 2000 series scope - I feel sooo stupid - Page 1
Forum section: electronics / testgear

author: cidcorp
author_rank: Unknown
timestamp: December 07, 2015, 08:35:28 pm
content: I can't believe I have to ask this:How? Exactly How? ...do I exit Store Demo mode on this damn scopeI know I'm going to hate myself when somebody says, oh yah, just <fill in absolutely simplest solution>.Did you ever notice that the attraction to 'PLAY' with a device goes up proportional with the number of knobs and buttons it has. Problem is whenthe person can't tell you how they 'enabled' a feature, well I've spent 10 minutes trying to find how to friggin' disable it.Some kind individual please... without laughing... explain where it is hidden in the menus (I assumed HELP or UTILITY) but no.Chris

author: HighVoltage
author_rank: Super Contributor
timestamp: December 07, 2015, 08:45:27 pm
content: I did not even knew that they have "store demo mode"How did you activate it?

author: georges80
author_rank: Frequent Contributor
timestamp: December 07, 2015, 08:55:27 pm
content: There are various demo modes accessible from the Help button.Some require you to press the 'Default Setup' to exit.Exactly WHAT demo mode is it in - picture?cheers,george.

author: MarkL
author_rank: Unknown
timestamp: December 07, 2015, 08:58:48 pm
content: Utility button (twice, if it has a text window up)OptionsPreferencesScreen SaverStore Demo (turn off)Wasn't that obvious? Thanks, Keysight!

author: cidcorp
author_rank: Unknown
timestamp: December 07, 2015, 09:10:17 pm
content: Quote from: MarkL on December 07, 2015, 08:58:48 pmLol, TOTALLY! Yes this one says in orange at top of scope "Store Demo Mode" with a description window describing the scope series.Worked the charm. Thanks all. Oh and I didn't know they had a demo mode either, well until someone activated itChris

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: December 07, 2015, 11:36:33 pm
content: Nice find! I worked with the 2000 X-Series for a year before I realized that existed.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 08, 2015, 08:11:36 am
content: Quote from: Keysight_DanielBogdanoff on December 07, 2015, 11:36:33 pmOK, now I feel not so stupid anymore.LOL
4191A control via excel - Page 1
Forum section: electronics / testgear

author: hazzer
author_rank: Regular Contributor
timestamp: December 07, 2015, 04:39:35 pm
content: Introhttps://youtu.be/MWgALPO3kccSoftwarehttps://youtu.be/l4lOqGtWdWQCalhttps://youtu.be/qsC1ObkCa7YMeasurement using ZPlotshttps://youtu.be/rs_8liByK6s
Goldstar OS-904 RD Manual - Page 1
Forum section: electronics / testgear

author: fivos
author_rank: Newbie
timestamp: March 21, 2014, 10:43:40 pm
content: Hi guys!This is my first post on this forum. I scored a Goldstar OS-904 RD on ebay, that came with a manual in German. This seams to be the top model of the OS-9000 series. Similar lower bandwidth model is the OS-902 RB. I'm looking for a English manual and from my online search I only found another one in Korean. Also a service manual may come in handy for a future calibration or troubleshoot.Any help would be appreciated. Thanksp.s. if someone needs the German manual I could scan and upload it.

author: pinyoro
author_rank: Contributor
timestamp: July 14, 2014, 12:15:51 pm
content: Hi, can't seem to find the service manual but here is a link to a user manual that contains schematics:http://elektrotanya.com/goldstar_os9000_series.pdf/download.html

author: tautech
author_rank: Super Contributor
timestamp: July 14, 2014, 08:35:10 pm
content: Lots of links to manuals in the Repair board:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/

author: kenny15963
author_rank: Newbie
timestamp: December 07, 2015, 09:59:19 pm
content: @fivosI recently bought a GoldStar OS-904RD with an English manual. It covers the OS-9020A, OS-902RB, OS-9040D, and OS-904RD. I've scanned in a copy but don't think I can attach it here due to it's size, 9MB. If you still need/want a copy PM me and I'll send it to you. Any recommendations on where to upload it so everyone will have access to it?

author: Marcos
author_rank: Contributor
timestamp: December 07, 2015, 10:59:21 pm
content: https://mega.co.nz/

author: tautech
author_rank: Super Contributor
timestamp: December 07, 2015, 11:14:16 pm
content: Quote from: kenny15963 on December 07, 2015, 09:59:19 pmWelcome to the forum.That's generous of you.I'd suggest you also share it on the web with one of the manual repostitories, this is my favourite:http://www.ebaman.com/index.php/remositoryPlenty more can be found in this thread:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/

author: fivos
author_rank: Newbie
timestamp: December 07, 2015, 11:19:25 pm
content: @kenny15963Thanks I would love to have it. Just upload it somewhere so everybody can access it and post the link

author: kenny15963
author_rank: Newbie
timestamp: December 08, 2015, 02:25:15 am
content: I uploaded it here. Let me know if you have any problems getting it.http://www.eserviceinfo.com/downloadsm/67552/GoldStar%20Precision%20Co.,Ltd._OS-9000%20series.html

author: tautech
author_rank: Super Contributor
timestamp: December 08, 2015, 03:19:06 am
content: Quote from: kenny15963 on December 08, 2015, 02:25:15 amLegend.
GW GPC-3030 / Tek PS280 5V fixed output current low - Page 1
Forum section: electronics / testgear

author: NRoach44
author_rank: Contributor
timestamp: July 05, 2015, 05:05:24 am
content: Hi again!The uni gave me a a GW GPC-3030 PSU which seems to be a really nice PSU. The only issue is that the 5V/3A fixed output only delivers ~600mA at best (depending on temperature and the position of the sun etc.). I thought it would be a nice learning experience to fix it.I found some schematics for the Tek PS280 which seems to be identical (except my PSU has analogue dials) enough to use. I've tried screwing around with the current limit trimpot but it didn't seem to have any effect.I'm not super good with transistors but I probed the base pin of the transistor and it's ~5V with no current but sits at 1.02V when shorted. I don't know if it'll help but here's the state of the transistor's base when I short the output:This is above my skill to diagnose, so I'd like some help.Thanks all!

author: magnehh
author_rank: Contributor
timestamp: December 09, 2015, 05:38:49 pm
content: I have this exact same power supply myself. I also found the same manual you are referring to. I'm disappointed it doesn't have a proper troubleshooting section, though, like the excellent Agilent service manuals.Have you measured all the voltages coming in to the 5V board?
Crazy expensive drill bits for Hakko FR-300 desoldering pump? - Page 1
Forum section: electronics / testgear

author: zzattack
author_rank: Regular Contributor
timestamp: December 07, 2015, 04:39:04 pm
content: My FR-300 gun constantly cloggs up. Sometimes the cleaning is successful with a small drill, but often this just ends up with the drill breaking, after which I'm left with replacing the nozzle. So I set aside to buy some Hakko cleaning parts. Being from Europe this isn't as simple as I would have hoped, but getting fresh nozzles and cleaning pins wasn't too bad. Since they're on the accessories list I figured I might as well get the hakko drill bits too.... Until I found that you can only buy them 10pcs at a time, for no less than $40.Now ideally I'd want them in 0.8, 1.0 and 1.3mm so that'd total $120 for some damn drills. Is this price anywhere near justified? Are the drills really really good (I guess not... why else would they sell in packs of 10)? Or am I better off finding a more friendly priced kind of drill that doesn't break as easily?

author: F64098
author_rank: Regular Contributor
timestamp: December 07, 2015, 04:50:45 pm
content: I have the same problem with my ERSA desoldering tool.For cleaning the nozzles i use drilled jigsaw blades which are flexible and won't break.Best regardsFrank

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: December 07, 2015, 04:57:01 pm
content: Hi,Have a look for a 'welding tip cleaner'. This is a bunch of stiff stainless wires that can be used to clean de-soldering irons.Regards,Jay_Diddy_B

author: owiecc
author_rank: Frequent Contributor
timestamp: December 07, 2015, 05:41:30 pm
content: 1mm drill bits cost peanuts in your friendly metal or electronics shop. I paid ca. 3€ in Poland for 10.I do not drill Hakko tips when they clog up. I use a hammer with a drill bit. You break the bit but it is much faster than drilling.
Agilent 82357B, installing the minimun software needed - Page 1
Forum section: electronics / testgear

author: ElektroQuark
author_rank: Unknown
timestamp: December 07, 2015, 08:32:44 am
content: Hi there,I have one of those GPIB USB adapters and I have just fresh install Windows 7.Is there a way of installing the minimum required software for it to work?The full Agilent suite loads the system with many services and, I think, unnecesary.Ideas to minimize?

author: HighVoltage
author_rank: Super Contributor
timestamp: December 07, 2015, 09:40:37 am
content: I think NI provides a driver that makes the Agilent 82357B work with LabView.These days I always have the Keysight I/O library installed and on a good Win 7 System it runs very stable.But then, I have a dedicated PC just for the Agilent / Keysight measurements.

author: nightpanda
author_rank: Newbie
timestamp: December 07, 2015, 12:41:40 pm
content: You may just install the visa shared component from here:http://www.keysight.com/main/software.jspx?ckey=2504667&lc=eng&cc=US&nid=-11143.0.00&id=2504667just 1.4M and you should be able to use your 82357B

author: ElektroQuark
author_rank: Unknown
timestamp: December 07, 2015, 01:31:47 pm
content: Do that include the 82357B driver?

author: nightpanda
author_rank: Newbie
timestamp: December 07, 2015, 04:14:45 pm
content: Quote from: EdoNork on December 07, 2015, 01:31:47 pmMy guess is yes, but I'm not sure.On IVI foundation website here, explains the VISA share component function as following shows:http://www.ivifoundation.org/shared_components/Default.aspxVISA and VISA.NET Shared ComponentsVISA and VISA.NET Shared Components install common components needed to provided consistency across VISA implementations from multiple vendors. These installers are not available on this download page because they are distributed as part of a vendor's installer for its VISA implementation. Please contact a vendor directly if you wish to use these installers separately.So since we downloaded from Keysight website, I think it should include everything needed for VISA communication.I'm sorry I do not have a clean PC for a try. Correct me if you have a chance to try it
Atten 858d+ vs YIHUA 858D - Page 1
Forum section: electronics / testgear

author: matth
author_rank: Contributor
timestamp: December 07, 2015, 10:48:24 am
content: I was looking to get one of these rework stations but looking on Ebay the Atten 858d+ seems to be a lot more expensive than the Yihua (non "+" version).I am interested to seek feedback as to what the differences are between the two and some feedback on what people think of the Yihua unit.Matt

author: Fungus
author_rank: Super Contributor
timestamp: December 07, 2015, 11:33:36 am
content: Watch this for an idea:

author: GreyWoolfe
author_rank: Unknown
timestamp: December 07, 2015, 12:31:26 pm
content: I have the Yihua 858D. Cheap and cheerful at $50 USD delivered. It works fairly well. I am happy with the purchase.

author: Fungus
author_rank: Super Contributor
timestamp: December 07, 2015, 01:41:09 pm
content: Quote from: GreyWoolfe on December 07, 2015, 12:31:26 pmYep. They seem to work, just be aware that the internals are built down to a price.
Fluke 177 incorrect AC readings - Page 1
Forum section: electronics / testgear

author: YU2
author_rank: Regular Contributor
timestamp: December 06, 2015, 11:57:16 pm
content: Today for 100 euros I was offered Fluke 177 that shows incorrect AC readings, when measuring 220V mains it shows about 118V. All other ranges supposingly works fine, DC voltages, caps, frequency, ohm range.What could be the source of error and what do you guys think is it worth to buy on a risk?

author: retiredcaps
author_rank: Super Contributor
timestamp: December 07, 2015, 12:16:14 am
content: Quote from: YU2 on December 06, 2015, 11:57:16 pmSkip for 100 euros. AC current is likely to be bad in addition to ACV.There are no schematics for the 17x series and all Fluke 17x are software calibrated.If the seller asks for less, significantly less, then it might be worth a chance.

author: Vgkid
author_rank: Super Contributor
timestamp: December 07, 2015, 12:23:31 am
content: Try to get it cheaper, the 179 uses an ad737 rms converter.

author: YU2
author_rank: Regular Contributor
timestamp: December 07, 2015, 10:08:50 am
content: Guess you are right, i'll skip it. For about about 100 euros I can buy Brymen 257s.
Quick Review: Cables, test leads, etc. from Franky - Page 1
Forum section: electronics / testgear

author: nidlaX
author_rank: Frequent Contributor
timestamp: December 07, 2015, 03:41:07 am
content: Last month, I placed a big order with Franky Tong (99centHobbies) for a bunch of random cables, leads, etc. Sorting out the goodies from the detritus on eBay is really annoying, so I decided to buy from his store on the basis of his good reputation here.Pardon the poor quality close ups as I don't have a proper macro lens for my camera at the moment. Images are clickable for full resolution.Everything shipped in this paper / plastic zip up bag, and each part is contained in its own zip up bag as well.Banana cables: good quality banana plugs and jacks with real flexible silicone wiring. Excellent, but a bit pricey.Banana plug to alligator clip adapters. The insulation is very thick.Shrouded female to unshrouded male banana adapter. Works just fine.Mini-hook leads with banana plugs. The grabbers feel good.Male to male jumper cables.The crimping quality looks decent.9V battery connector. I would like to see the PVC solid core wire replaced with soft silicone wire.ETA needle point adapters. Very handy for probing in hard to reach / dense areas.These points will draw blood, but they're not very hard - use with care.The plastic guard is actually a fair bit wider than the metal core. Not sure if this is by design.Fits snugly on my Brymen / Greenlee test leads.Did I save the best for last? Not quite. These Digitek leads are ok, but I would rather buy the Brymen leads if I could do it over. Cables are PVC and feel similar to my UNI-T cheapies.But let me get to the point: these tips are similar in sharpness to ball point pens.A quick n dirty measurement gives ~0.87mm diameter for these vs. ~0.42mm for my Brymen / Greenlee leads. Also, they are not compatible with the ETA adapters.Overall, I'm pretty happy with the quality of most of the things I purchased. I may have left out one or two other items such as the bare silicone wires or a spade adapter, but you can expect similar results. My one gripe is with the Digitek leads, but I suppose I got what I paid for.If you want good leads with sharp tips and soft silicone wiring, go for the Brymen every time (or step up to the Probemaster if you prefer).Thanks for looking. Keep up the good work Franky!
My effort at reducing Rigol DS2072 fan noise - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: December 05, 2015, 11:00:54 am
content: Cutting away metal grille on fan outlet reduces turbulent flow and noise. Degree of noise reduction is not as apparent in video because when the metal grille is removed the reduced rushing noise is countered by the increased audio sensitivity of the volume compression of phone taking video. Putting plastic case back on does reduce the improvement though.Video ->https://youtu.be/frFZ5vPm7oo

author: fanOfeeDIY
author_rank: Unknown
timestamp: December 06, 2015, 08:37:02 am
content: Nice!Thick designed fan guard is common to make the fan noise larger.I used to remove them and replace it with circle wire type fan guard.

author: Karel
author_rank: Super Contributor
timestamp: December 06, 2015, 09:08:48 am
content: Nice job, I hate the fan noise as well. But what about EMI/EMC?Will it affect sensitive measurements in a noisy environment?Just thinking.

author: Circlotron
author_rank: Super Contributor
timestamp: December 06, 2015, 10:53:48 pm
content: EMI/EMC? I imagine that is possible. The frequency of what escapes would depend on the size of the fan hole. Maybe someone can calculate that, but 50mm is a full wavelength at 6GHz so it may not be a problem. Not completely sure, but you would expect things to be degraded maybe a tiny bit.
Dp832  - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: December 05, 2015, 03:09:48 pm
content: Is it possible to set a voltage of positive 15 and negative 15 on the rigol dp832?ThanksAztlan

author: Marchello
author_rank: Contributor
timestamp: December 05, 2015, 03:19:28 pm
content: Yes. CH1 and CH2 fully isolated.
ir3000 FC and Fluke 287 - Page 1
Forum section: electronics / testgear

author: Helix70
author_rank: Unknown
timestamp: December 04, 2015, 12:57:12 pm
content: In the spirit of "Take it apart!", I thought I would share the insides of the ir3000 FC bluetooth adapter for the Fluke 287/289 series multimeters.While it was apart, I used it the perform my firmware upgrade, by hooking up the conveniently separated TX/RX PCB to a FTDI USB adapter.