hybridfree/eevblog-posts huggingface dataset:
Keithley 2460 ZOut in CC Mode - Page 1
Forum section: electronics / testgear

author: rfbroadband
author_rank: Unknown
timestamp: March 06, 2017, 03:47:54 am
content: I used the 2460 in constant current mode (CC) a while back and was surprised about the lower than expected output impedance. To my surprise the output impedance of the 2460 in CC mode is not specified in the datasheet. In short, I characterized the output impedance in CC mode. The measurements results for the different current ranges are attached below. It is not surprising that the output impedance will decrease for higher current ranges, as the internal capacitance of the larger output devices will dominate ZOut. Just to be accurate, be aware that my measurement setup is only valid for impedances of up to 20kOhm.I discussed this with Keithley and the applications engineer agreed that the output impedance should definitely have been specified in data sheet and he will get the info for me shortly. Long story short, Keithley will not specify (or at a minimum release a few basic guidelines) on the output impedance of the 2460 in CC mode. The attached graph was sent to R&D and R&D simply refuses to clarify : ZOut for current range x should be y.I would like to point out that I am not arguing that the impedance should be a certain value for a given current range, I simply wanted to know what I should expect.This is supposed to be the state of the art SMU on the market that costs 7k$ and the manufacturer is refusing to release a basic DC output impedance spec of the SMU in cc mode.Maybe some of you will find attached results interesting.The 2450 and 2460 are in general very nice units but it is disappointing that Keithley will not release basic impedance specs.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 06, 2017, 04:27:27 pm
content: There should be some impedance specs - at least typical values.The curves look about as expected: the CC mode looks like an an capacitance. Something like 2-3 µF for the 1 A range is not that bad.
Agilent E7495A - Page 1
Forum section: electronics / testgear

author: usagi
author_rank: Frequent Contributor
timestamp: March 06, 2017, 10:08:57 am
content: Got one of these recently for $470. Pretty good deal imo.GPS seems pretty insensitive, other u-blox based GPS units I have easily blow this away. I never got a full lock inside my house - it never progresses beyond yellow triangle and 5 satellites. Also interesting that it doesn't update the date/time either even with partial lock.Signal generator is limited to >=375mhz. A bit disappointing. I guess not as disappointing as the fact the generator wont do anything except CW and CDMA/GSM/EVDO. No straight FM or AM or sideband, lol.Does anyone know how to disable the T1 analyzer, short of opening it up and disconnecting it? It sits there for around 90 seconds on bootup just initializing the T1 analyzer -- pretty annoying.
What oscilloscope to buy?  Tek 543 or B&K 2030 analogue  - Page 1
Forum section: electronics / testgear

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: March 09, 2017, 08:21:42 pm
content: Hi, I have narrowed down my new scope to these choices.Tek 543 is advertised as not working but no missing parts and the photos show a dirty scope with a few missing parts. There seems to be no obvious abuse. The seller claims it did work last year and it blows fuses. He open it up but didn't see any missing parts.The B&K 2030 is working but the traces keep dropping off the screen, the pictures show a bright CRT, with two working traces. It looks like it has been bounced around a bit but decent. The seller is probably a reseller as he has other test equiptment up for sale.The sellers are asking the same price for either one.Any recommendations?

author: tautech
author_rank: Super Contributor
timestamp: March 09, 2017, 08:24:11 pm
content: You'll very likely need another scope to fix either, do you have one ?

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: March 09, 2017, 09:53:23 pm
content: Yes, a JYE 138.

author: tautech
author_rank: Super Contributor
timestamp: March 09, 2017, 09:56:52 pm
content: Quote from: joseph nicholas on March 09, 2017, 09:53:23 pmThen get the Tek, there's much more info online for them.

author: tggzzz
author_rank: Super Contributor
timestamp: March 09, 2017, 10:49:41 pm
content: Considerhttp://www.ebay.co.uk/itm/Tektronix-485-Oscilloscope-/292043966842No affiliation, other than as someone who has bought accurately described CRTs and a 485 from him.
What's New on Ebay: March 2017? DSO for $300, USB DSO for Android, etc - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: March 04, 2017, 06:26:54 pm
content: Hello anyone!I`m not experienced in internet market. Tell me pleaseWhat simple DSO models will be choise in 2017?Why I still can`t find some USB-scope for Android?Thanx

author: 001
author_rank: Super Contributor
timestamp: March 05, 2017, 05:53:25 pm
content: Quote from: blueskull on March 04, 2017, 06:48:27 pmAwesome idea! I did not even think that this is possible!Any links?
CMU200 - Method for listening to Audio without Audio Board!! Enjoy - Page 1
Forum section: electronics / testgear

author: radiorick
author_rank: Newbie
timestamp: January 06, 2017, 07:00:27 pm
content: For all of you who want to expand how you use your CMU200 and actually listen to audio from the analyzer, here is a way to accomplish that.My Setup* CMU200 set up with spectrum analyzer running, enter frequency, set span to acceptable range (I set to .002) just for testing.* General Coverage Receiver capable of receiving 10.7 Mhz (Should be capable of type of modulation you wish to demod)* Connect IF3 RX OUT on rear of CMU200 to Antenna Input on General Coverage Receiver (You may choose to place an attenuator here) I didnt need to.* Start general coverage receiver and set to 10.7mhz and demod mode (AM,FM,FMW,LSB,USB) Whatever mode you need.* Adjust squelch and volume to your desired levels and listen away.* DONT Change the frequency of the general coverage receiver as it is relying on the IF RX 3 signal for its source.* Manipulate the CMU200 Frequency to whatever you desire, Play around with some settings.I am able to listen to AM,FM, FM Broadcast, LSB, USB. No issues, plus as the signal strength increases so does the IF level which allows the use of squelch.'73K7RLW - RadioRick

author: DL8EBD
author_rank: Newbie
timestamp: March 05, 2017, 02:04:43 pm
content: great idea
Looking for multimeter - Page 1
Forum section: electronics / testgear

author: Davy
author_rank: Regular Contributor
timestamp: March 06, 2017, 01:16:27 pm
content: Hi, I'm looking for a new multimeter, right now I'm looking at the Radio Spare pro (Iso-tech) RS Pro IDM99IV Digital Multimeterhttp://uk.rs-online.com/web/p/digital-multimeters/8732367/and the Testo 760-3http://uk.rs-online.com/web/p/digital-multimeters/9055882/The Testo series does away with the rotary switch, which I think is a plus but the battery life is suspect using only three AAA of which isn't mentioned, my criteria is I prefer one with a bar graph display.I wonder has anyone come across these and wouldn't mind sharing their thoughts, thanks.Dave.

author: retiredcaps
author_rank: Super Contributor
timestamp: March 06, 2017, 06:45:53 pm
content: I haven't used either, but the RS Pro IDM99IV is made by Appa Technology.The dual display on the Testo might be interesting for some measurements?

author: BroMarduk
author_rank: Unknown
timestamp: March 06, 2017, 06:51:00 pm
content: I have not used either but the Testo 760-3 looks real interesting. The only thing from a hobbyist standpoint that I don't like is the 2.5V cap on the diode testing (prefer at least 3.2 to get some white LEDs tested) although the RS Pro is only 2.0V. The capacitive ranges are much better on the Testo (down to 1pf vs 1nf and up to 60mf vs 10mF) as well as the voltage settings going down to .1 mV on DC as well as AC. The RS Pro has AC+DC current support and the Testo does not. Testo goes up to 60MHz on frequency compared to 100kHz on RS Pro.I guess it would come down to if you need AC+DC measurements or better component (resistor/capacitor/DC/Frequency/voltage) ranges as to which would work best for you.

author: Davy
author_rank: Regular Contributor
timestamp: March 06, 2017, 09:18:15 pm
content: Thank you to retiredcaps & BroMarduk.I was beginning think I'd posted on the wrong board when I saw Metrology.... I thought it was Meteorology, 'Silly me'.After doing a lot of searching I came across this thread right here on EEVbloghttps://www.eevblog.com/forum/testgear/opinion-sought-on-testo-760-2-multimeter/the internal pictures make me kinda shudder.Dave
Fluke 787  - Page 1
Forum section: electronics / testgear

author: BroMarduk
author_rank: Unknown
timestamp: March 03, 2017, 03:15:13 pm
content: I saw that MCM Electronics in the US has the Fluke 787 for 499.00 USD (with limited stock). It looks to be a closeout, which made me wonder if it has been discontinued or if this is just a good deal. I also noted that the 787 is not in the multimeter spreadsheet. Is the multimeter portion comparable to a Fluke 87 (since its only 4000 count I would guess its a straight 87 or 87III with the addition of a loop calibrator) or is it it's own beast?Trying to make sense of the specifications but still a bit confused and trying to figure out if it could do both jobs equally well...

author: BroMarduk
author_rank: Unknown
timestamp: March 03, 2017, 03:53:17 pm
content: Well, now I feel silly...answered my own question courtesy of the Fluke web site. Teach me not to read the overviews and click right to the specs....QuoteSource:http://en-us.fluke.com/products/ma-loop-calibrators/fluke-787-process-calibration-tool.html

author: retiredcaps
author_rank: Super Contributor
timestamp: March 03, 2017, 07:10:37 pm
content: Quote from: BroMarduk on March 03, 2017, 03:15:13 pmThe Fluke 87I, III and V are markedly different to the 787 in a number of ways internally. If you don't need the functionality of the 787, just get the normal Fluke 87 variation. The 787 is also quite old compared to the newer 789.PS. The 787's battery life is nowhere near the normal Fluke 87.

author: BroMarduk
author_rank: Unknown
timestamp: March 04, 2017, 03:02:19 am
content: Thanks for the push...I'm now leaning towards the 87V....rather have the better DMM and the number of times I'll need to do any 4/20ma work is small and I can borrow something then.
Adjustable AC load  - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: March 04, 2017, 02:26:35 pm
content: My present AC load is a pretty crude home-made gizmo with a 100W pot and various bulbs and heaters (see image below). It has served the purpose but is far from ideal. Google search for AC loads does not show much other than the big industrial typically 1500W and up loads.Most of the time I just need a variable 0-100W load that is used in the 10-250Vac range (50-60Hz). Does anyone know of any products in the 100W range?If not does anyone have suggestions for an an active circuits that would be suitable?

author: Jester
author_rank: Frequent Contributor
timestamp: March 04, 2017, 07:25:00 pm
content: Google search led to this circuit:Perhaps this circuit with 600V FET's and a BIG heatsink might do the job?

author: David Hess
author_rank: Super Contributor
timestamp: March 05, 2017, 04:24:36 am
content: Another way which might be suitable is to put a heavy heat sinked resistive load onto the output of a variac. Then you can adjust the variac to adjust the load.
BlackStar Jupiter 2000 Restoration - Novice Level - Page 1
Forum section: electronics / testgear

author: reddish75
author_rank: Regular Contributor
timestamp: December 05, 2016, 07:00:18 pm
content: Hi, I'm trying to restore two BlackStar Jupiter function generators, the first of which worked of a fashion but after a recap and a clean up it seemed to work ok, however.....when trying to follow the calibration in the service manual (see attached with thanks to Tristan at TTI) I'm either not following it properly of theres something else wrong in there.Firstly the voltage check at Tp 7/8 are correct at -15.17v and 15.21v but then it starts to go wrong, whichever position VR4 is in VR1 just wont adjust the voltage at TP5 below 120mvSo any pointers on where to look/measure/scope any help would be appreciated.https://1drv.ms/b/s!AhyV-hIo37nZpmpKgUIKInekTCFlThanksChris

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 05, 2016, 07:08:01 pm
content: The top side of VR4 is grounded (TP1), so when VR4 and VR1 are both set at the top (as seen in the diagram) TP5 should be zero volts.

author: reddish75
author_rank: Regular Contributor
timestamp: December 05, 2016, 07:37:10 pm
content: So VR4 should be set at the TP1 side? for the start of calibration?Just a thought, the frequency pot VR1 where does this have to be set before calibration or does not not matter? Same with the Duty control (VR6) as well?

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 05, 2016, 08:35:53 pm
content: Reading the calibration instructions:2.a) Set VR4 fully anti-clockwise. (I assume this is the TP1 side)b) Adjust VR1 (the frequency control) to get -10mV at TP5.So, before calibration VR1 doesn't matter, it is set during one of the first calibration steps.I didn't see VR6 mentioned in the cal procedure at all (just quickly scanned it), but the general rule heer is don't touch it until it is mentioned.

author: NottheDan
author_rank: Frequent Contributor
timestamp: March 04, 2017, 02:58:35 pm
content: Thanks for posting the service manual. I just acquired one of these. Though, is there a user manual for it online too somewhere? My google-fu didn't bring anything up.
Question about a Tektronix 5103N - Page 1
Forum section: electronics / testgear

author: FastEddieFelson
author_rank: Newbie
timestamp: March 03, 2017, 11:50:32 pm
content: There's a Tektronix 5103N for sale near me for $100 that doesn't power on. From the photos it looks like it's in good shape except the center module is missing. Is this an "easy" to repair scope for a beginner? Could the fact that it won't turn on possibly just be related to the missing module? The person selling it has no idea how to use it (not that I know much more) but for the money I was thinking about picking it up if I could get it running again. Right now I don't have a scope so a used one in this range is appealing. Is this a good choice or should I try something else?

author: singapol
author_rank: Frequent Contributor
timestamp: March 04, 2017, 03:36:17 am
content: Only 2 Mhz. bandwidth.You are better off getting a 100Mhz. scope that works from ebay for same money.just be patient and wait.

author: David Hess
author_rank: Super Contributor
timestamp: March 04, 2017, 08:25:31 am
content: For $100 you should be able to find something better. The Tektronix 5000 series were intended for the physical sciences and not electronics; as singapol points out, the 5103N only has a 2 MHz bandwidth.The 5103N does not require the middle plug-in which is the second vertical plug-in to operate. These oscilloscopes are fully documented and it is likely repairable but it is not something I would recommend for a beginner unless they already own it.
earth leakage current - Page 1
Forum section: electronics / testgear

author: Somnath7
author_rank: Newbie
timestamp: March 03, 2017, 04:44:01 am
content: what is the ideal method of measuring earth leakage current of class 1 equipment and class two equipment , please tell me the point where i have to measure either between line to earth or earth to metal body of the equipment, please tell me

author: DaJMasta
author_rank: Super Contributor
timestamp: March 03, 2017, 05:59:53 am
content: Don't know if this is the "official" way to do it, but why not break the chassis ground/earth path, then put your multimeter on milliamp mode and connect the positive lead to the now floating chassis ground and the negative lead to the earth?

author: ElektronikLabor
author_rank: Regular Contributor
timestamp: March 03, 2017, 06:57:40 am
content: Class II equipment is not galvanically connected to earth thru the mains plug, hence you can't really measure the leakage current.To measure leakage current of Class I equipment is a little tricky without official VDE 701/702 tester, because you have to measure AC current, because even if the mains section of the equipment is galvanically isolated from ground, it could still be capacitive coupled to earth.One simple way to measure the current is with (a self made) custom extention mains cable. Simply cut the earth wire in the middle of the cable and attach two banana plugs to it. You can connect the plugs to a Multimeter in AC current mode. In that way you can measure the leakage current while you operate the equipment.But be carefull! If the fuse of the multimeter is blown during the test, your equipment will not be connected to earth anymore!Sorry for my drawing skills:

author: Jester
author_rank: Frequent Contributor
timestamp: March 03, 2017, 12:30:11 pm
content: One other note, the leakage current should also be measured with the hot and neutral reversed. If I recall IEC1010 has a sketch of an appropriate test jig.

author: MrW0lf
author_rank: Frequent Contributor
timestamp: March 03, 2017, 12:38:21 pm
content: BTW in real world leakage hunt this has given me almost godlike powers:https://www.gigahertz-solutions.de/en/rf-and-emf-meters/low-frequency-emf/me-series/397/me3951aHow about detecting water heater current leakage thru copper pipefrom another apartment, thru floor, several meters away?They have cheaper models also. Very useful in keeping lab environment clean from various interference sources.

author: Jeroen3
author_rank: Super Contributor
timestamp: March 03, 2017, 05:12:38 pm
content: With a Fluke 360. Cheaper ones are available from other brands.
A couple of scope bargains - Page 1
Forum section: electronics / testgear

author: Tom45
author_rank: Frequent Contributor
timestamp: March 02, 2017, 04:25:13 pm
content: A couple of recent emails about scope bargains:1: Buy a Keysight 3000T, 4000, or 6000 scope and get a free DSOX1102G. This goes through the end of September 2017.2: Microlease has a whopping savings of $138,342 for a Tektronix MSO73304DX 33GHz, 4CH Digital Phosphor Oscilloscope - List Price: $394,342 / Sale Price: $256,0003: Also Microlease has a more modest savings of $77,262 for a Keysight N5242A 26.5GHz, 4-Port PNA-X Network Analyzer - List Price: $252,262 / Sale Price: $175,000With all the money you save from the MSO73304DX, you could easily afford a Keysight 6000 series scope and get the free DSOX1102G.

author: james_s
author_rank: Super Contributor
timestamp: March 02, 2017, 09:22:00 pm
content: Quote from: Tom45 on March 02, 2017, 04:25:13 pmLet me go root around in my sofa, there's bound to be some loose change in there somewhere

author: JonM
author_rank: Unknown
timestamp: March 02, 2017, 11:41:24 pm
content: Quote from: james_s on March 02, 2017, 09:22:00 pmNote that the Microlease deals are "Certified Pre-Owned", so they may not have the aroma of brand new equipment...

author: macboy
author_rank: Super Contributor
timestamp: March 03, 2017, 02:18:32 pm
content: Quote from: Tom45 on March 02, 2017, 04:25:13 pmThree for the price of one! One 4-bedroom house that is.

author: rrinker
author_rank: Super Contributor
timestamp: March 03, 2017, 02:26:12 pm
content: Well at least the N5242A is less than I paid for my house. Slightly.
Brymen BM878 - Page 1
Forum section: electronics / testgear

author: JohnWW
author_rank: Contributor
timestamp: March 02, 2017, 03:43:26 am
content: Hello FolksDoes anyone know if/who is selling the Brymen BM878 insulation DMM in Australia.Thanks

author: mimmus78
author_rank: Unknown
timestamp: March 02, 2017, 08:37:14 am
content: I have a demo unit here.State is mint, I think it wasn't out of the package more than a couple of times.If you are interested PM me.

author: JohnWW
author_rank: Contributor
timestamp: March 03, 2017, 12:52:08 am
content: Thanks for the reply.I will message you for details.What do you think of the tester?
($60 Owon B35T+) + (Graphic Display) >= ($300 Uni-T UT181A) ??? - Page 1
Forum section: electronics / testgear

author: MrCreosote
author_rank: Contributor
timestamp: March 02, 2017, 10:08:15 pm
content: Note the InequalitySo I'm totally sold on the "BEST+" but it is so affordable (cheap) I figure for another $50-100 I could find the same features in a graphical display DMM.What was I thinking?For the $300 UT181A, I'd start looking for a DSO that would replace my Tek 465B, but then the DSO's I've researched do not have all the simple bells and whistles a DMM has even if they say it does "DMM" too. That is another mystery. With all the performance of an actually o-scope, the cost of embedding a complete DMM before the preamps would be, well, less than the cost of the DMM itself - so what, another $50 added to a $300 class DSO?I must be retarded with all these crazy thoughts...I suspect in the next year, the DMM market is going to be flooded with graphical displays. But not now.And the Fluke 289 with it's clap trap BluTooth thingee-ma-bob is embarassing - kind of like MSD's pathetic attempt to evolve. And Fluke lives in you pocket when you want any kind of connectivity or software. I never thought I'd say it, but I really wouldn't want a 289. Just the sight of the battery compartment is enough to make me ....Oh and the 181a uses some kind of weird proprietary data file so even if you download it, you cannot get it into a spreadsheet - at least that is what one reviewer said. So NO Kudos for Uni-T.Makes me wonder what Owon is about to do. Some sites say the B35T has been discontinued - butwhat about the + model?If I knew Owon was coming out with a new graphical DMM, I would sit and wait for it.CONCLUSION? Buy the B35T+ now and wait to upgrade to Graphical Display?Thoughts or Comments?Thanks so much in advance,Tom
Fluke 289 FlukeView Forms Combo Kit - Page 1
Forum section: electronics / testgear

author: malgailani
author_rank: Newbie
timestamp: March 01, 2017, 04:11:27 am
content: Hi,Recently I purchased 3 units of Fluke 289 FlukeView Forms Combo Kits, all manufactured in 2016 from different sellers in the US.Two of them have similar labels on the side of the box indicating that the country of origin is US, while the third doesn't. Also if you view the attached photos, ITEM No. for the first two is 3036206 while the third is 3795230. There are other differences, the first two have a blue dot stickers on the box, above the printed label, but the third has a green dot. Printed model is Fluke-289/FVF for the two while the third is Fluke-289/FVF/VWVG.Inside the box all three are identical, I couldn't find any differences except for the smell of the silicone test leads of the third unit, which was different (all Fluke premium silicone leads have a distinct smell).Could any one please provide some explanation about these differences?ThanksPhoto#1https://drive.google.com/file/d/0B4yaYx6ID9erZjdiN3gxMTdaenM/view?usp=sharingPhoto#2https://drive.google.com/file/d/0B4yaYx6ID9erX3ZuRjRyQWNRS0E/view?usp=sharing

author: BroMarduk
author_rank: Unknown
timestamp: March 02, 2017, 01:54:21 pm
content: Looking at the photos it actually looks like a Fluke-289/FVF/WWG part number on the odd one. I looked around and see similar SKUs but hard to tell what is different. I seem to see WWG mostly when the IR3000 is included. Could also refer to something like the case too.
Honeytek A6013L Capacitance Meter - Page 1
Forum section: electronics / testgear

author: JenniferG
author_rank: Frequent Contributor
timestamp: February 24, 2017, 05:16:40 am
content: I did a search and didn't come up with any results here, which was actually surprising.I have this Honeytek A6013L Capacitance Meter and wondering how good it is? Its the only capacitance meter I have. Will it serve all my needs? Here is a photo I took of it.I have a bunch of tiny little ceramic disc caps, varying in capacity, as small as pF in size.. I am wondering if I can just use a meter to find the value I need or do I need to put that little thing under a microscope and read the tiny number and then cross reference that number to some list (which I need to find).I apologize for my newbie question(s).

author: kripton2035
author_rank: Super Contributor
timestamp: February 24, 2017, 07:42:06 am
content: this won't be good for low value capacitors. ( and I don't know for current values too...)you need a budget around $100 and get a deree de5000 meter that will check capacitors,but also resistors and inductors and ESR down to the milli-ohm.http://kripton2035.free.fr/LCR%20meters/lcr-deree5000-cl.html

author: DimitriP
author_rank: Super Contributor
timestamp: February 24, 2017, 11:38:40 am
content: I'm sorry to hear your google is brokenhttps://www.amazon.com/dp/B0036FQ3FW/?tag=mh0b-20&hvadid=7011185820&hvqmt=e&hvbmt=be&hvdev=c&ref=pd_sl_1wqnjvozn6_eSince you already have the meter, and some capacitors, why don't you introduce them to each other and see what you get for readings?

author: kripton2035
author_rank: Super Contributor
timestamp: February 24, 2017, 01:09:34 pm
content: I'm pretty sure this meter won't achieve a 0.1 pF accuracy...or even 0.5% !a 0.1pF resolution eventually .

author: JenniferG
author_rank: Frequent Contributor
timestamp: February 24, 2017, 01:59:31 pm
content: Quote from: DimitriP on February 24, 2017, 11:38:40 amI said I did a search "here" not on google. And I have already introduced the meter to capacitors, and was happy with the results with the larger electrolytic caps.

author: JenniferG
author_rank: Frequent Contributor
timestamp: February 24, 2017, 02:02:31 pm
content: Quote from: kripton2035 on February 24, 2017, 07:42:06 amThanks, I've been watching videos now on this LCR and have been "googling" about it.

author: Shock
author_rank: Super Contributor
timestamp: March 02, 2017, 11:59:21 am
content: Everyone's needs are different in electronics so it helps if you quantify your questions by looking at the components you will be using and compare other meters specifications to see what they can do as a comparison. This and looking up data sheets is all part of the game.On specifications, hopefully the Honeytek has a manual, any test equipment worthwhile will have listed the specifications, which include things like the resolution, accuracy and counts/digits and other operating conditions. You can determine from there if test equipment is suitable for your application. There are eevblog videos on this and plenty of worthwhile reading.
Anybody have experience with Ultrasonic Flaw Detectors (NDT)? - Page 1
Forum section: electronics / testgear

author: V_King
author_rank: Regular Contributor
timestamp: March 01, 2017, 09:04:15 pm
content: Hello,does anybody have any experience with ultrasonic flaw detectors?I am doing a welding project which involves some waterproof welds and am interested in buying a NDT tester to check for cracks. I used one GE manufactured one in uni and really liked the results, but the price is out of my scope. On the other hand there is a good condition Krautkramer Branson USD 10 (a bit older vintage) from army surplus store but it does not have probes. The connections look like BNC ones, but I am not sure. Does anybody know whether the probes are universal for these type of testers or are they manufacturer specific?Any other thoughts/recommendations in regards to these testers?Thanks

author: 3db
author_rank: Frequent Contributor
timestamp: March 02, 2017, 01:02:54 am
content: I'm not sure if the probes (transducers) are standard among manufacturers.I think there a few ultrasonic test methods in NDT and they select different transducers depending on the type of test.3DB

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 02, 2017, 04:04:47 am
content: You'll need to select the correct probe for the type of beam you think you need to look for what you are looking for... and the right couplant. Unless you're putting the whole thing under water?I used Hamikleer and it was quite messy. I used Sonatest machines. I even visited the factory!Plus you might want ASTM test and step blocks.Also you'll find various weird connectors like Microdot being used on the probes themselves, the testers usually use BNC, or LEMO.
uCurrent GOLD LMV321AS5X or 296-9567-1-ND which one to chose? - Page 1
Forum section: electronics / testgear

author: mikolajj
author_rank: Newbie
timestamp: February 27, 2017, 04:17:04 pm
content: Hello,I'm trying to build uCurrent GOLD and I have first problem.Checking BOM I have found LMV321AS5X (pos. 2 in BOM) on Digikey website, I have fount 3 versions of thisbut number from "Supplier 1 Part#" 296-9567-1-ND gives me part LMV321IDBVR with different parameters.This is main difference table:296-9567-1-ND (LMV321IDBVR)LMV321AS5XCT-NDSlew Rate1 V/µsSlew Rate1.5 V/µsGain Bandwidth Product1MHzGain Bandwidth Product1.4MHzCurrent - Input Bias15nACurrent - Input Bias1nAVoltage - Input Offset1.7mVVoltage - Input Offset1mVCurrent - Supply130µACurrent - Supply100µACurrent - Output / Channel160mACurrent - Output / Channel34mASo which one is the right one for uCurrent GOLD ?Can you help me with this component?

author: guenthert
author_rank: Frequent Contributor
timestamp: March 01, 2017, 07:39:06 am
content: Hmmh, I just opened mine and had a look at U2. What I can make out is "AC1F", not sure if that's of any help.Now looking at the schematic however, I see that U2 is just used to provide virtual ground. I'd think that ought to be fairly uncritical (any deviation from the ideal, e.g. slow response to step change on the input, is suppressed by the common mode rejection of U1, U4), but I'm no EE.
Sell my new second function generator? - Page 1
Forum section: electronics / testgear

author: Housedad
author_rank: Frequent Contributor
timestamp: March 01, 2017, 12:30:31 am
content: I find myself in a conundrum. In January, when I was setting up my bench, I bought a new GW Instek SFG-1013 function generator. It is 3Mhz with voltage display. I thought I was set for a while while learning. However, Ebay was suddenly flooded with Rigol DG1022's and I just could not resist at a price of $85. (Early Onset TEA Syndrome or EOTS) Anyway, I now have the two units and the Rigol works fine. The Instek is still in the box waiting for me to decide what to do with it.So I'm looking for opinions on whether I should sell the Instek or keep it for a rainy day, or sell it and stay with one generator or get another Rigol dg1022. (They are a bit pricier now, but still a decent bargain.) I just don't know if this unit will be needed in the future.I hate having lost so much knowledge over the years as it makes making decisions like this harder. It has to be 30 years since I had a test bench and dabbled in electronics.Thanks for the opinions!!

author: james_s
author_rank: Super Contributor
timestamp: March 01, 2017, 01:20:17 am
content: Are they hard to find or did you get an exceptional deal on it? Do you need more than one function generator? If the answer to both of those is "no" then I'd say definitely sell it. If either answer is yes, then it's probably a tossup. Is there something else you could spend the money on? Personally I've rarely found a need for more than one function generator.
Rigol DS2072A Print to USB Problem  - Page 1
Forum section: electronics / testgear

author: iBeta
author_rank: Newbie
timestamp: March 02, 2017, 12:54:27 pm
content: Around 50% of the time, using any method to print the waveform fails. It looks like it has worked, however the image file shows a blank scope screen, with no signals present.This is a bit annoying, because it is difficult to know if the print worked before connecting the usb stick to a pc.Rigol are aware of this, however the latest fw I've got (00.03.05) still has the error.
Fluke 123 slow screen update - Page 1
Forum section: electronics / testgear

author: Liteace
author_rank: Regular Contributor
timestamp: February 28, 2017, 07:14:26 pm
content: Ive just got hold of vgc Fluke 123 scope meter, it seems to be working OK but when I increase the time/div the dc volt display in the top corner take along time to refresh, when its in auto mode it very fast, is this the way they are or has it got a problem ?Thanks

author: mahi
author_rank: Regular Contributor
timestamp: February 28, 2017, 08:06:17 pm
content: That's how it works with the 120 series ScopeMeters. The primary and secondary measurements are updated at the end of each waveform paint. In fact it does not seem to have an independent DMM but calculates the measurements from the waveform. So a slow timebase does indeed result in slow measurements as well. Up to 20 ms/div the refresh rate is fine but anything slower can get frustrating if you need fast feedback.

author: Liteace
author_rank: Regular Contributor
timestamp: February 28, 2017, 09:35:11 pm
content: Thanks for the info, as they say, you live and learn.What a shame, nice little unit but far to slow for what I need it forThanks again
Analyzing IR remotes with Saleae Logic - Page 1
Forum section: electronics / testgear

author: ziplock9000
author_rank: Regular Contributor
timestamp: February 17, 2017, 11:42:23 am
content: It seems that Saleae Logic doesn't have a pre-built analyser for IR remotes (AFAIK). There seems to be some 3rd party ones, but you have to compile the damn things yourself which I don't want to do.Does anyone have a compile 3rd party compiled plugins for this?Windows 10 - Saleae Logic V1.2.11Thanks.

author: macboy
author_rank: Super Contributor
timestamp: February 17, 2017, 01:58:15 pm
content: Try Sigrok. It has decoders for most common IR formats, and it works with the Saleae (and clones).

author: ziplock9000
author_rank: Regular Contributor
timestamp: February 17, 2017, 02:19:52 pm
content: Quote from: macboy on February 17, 2017, 01:58:15 pmThanks.It has IR NEC and IR PC5.. Shame it doesn't have all of the manufacturers.

author: macboy
author_rank: Super Contributor
timestamp: February 18, 2017, 07:54:29 pm
content: Quote from: ziplock9000 on February 17, 2017, 02:19:52 pmThey are not all listed together under "IR" but more are there. Philips RC6, Sony SIRC, etc.

author: ziplock9000
author_rank: Regular Contributor
timestamp: February 19, 2017, 08:27:33 am
content: I'm only getting these ones:

author: ebastler
author_rank: Super Contributor
timestamp: February 19, 2017, 09:06:47 am
content: Quote from: macboy on February 17, 2017, 01:58:15 pmQuote from: macboy on February 18, 2017, 07:54:29 pmWhere do you get those protocol decoders?Underhttps://sigrok.org/wiki/Protocol_decoders, they are all listed as candidates for future implementation, with 0% progress.

author: ziplock9000
author_rank: Regular Contributor
timestamp: February 27, 2017, 02:21:52 pm
content: I'm extremely surprised that neither software has a decoder built in for such a common use application like the dozen or so IR receiver protocols.

author: pascal_sweden
author_rank: Super Contributor
timestamp: February 28, 2017, 08:00:26 pm
content: Take a look at the IRMP library for Atmel and Microchip microcontrollers.This is the best library which you will ever find!It can decode up to 48 IR protocols!http://www.mikrocontroller.net/articles/IRMP
R&S CMU200/CRTU-RU: is it possible to use SCPI commands through ethernet/telnet? - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: February 26, 2017, 06:04:00 pm
content: Hi,Can anyone tell me if you can use SCPI commands on the R&S CMU200/CRTU-RU (DOS mode) over ethernet/telnet?I know there is a GPIO port, but I don't have any interface for it. What would be the cheapest way to connect to this interface?Is there any documenation for SCPI on these devices?Thanks!Regards,Vitor

author: tmbinc
author_rank: Frequent Contributor
timestamp: February 27, 2017, 11:08:57 am
content: As far as I know, no.You can use RS232 though -https://www.eevblog.com/forum/testgear/rohde-schwarz-crtu-gpib-control/

author: Bicurico
author_rank: Super Contributor
timestamp: February 27, 2017, 11:35:10 am
content: Thanks tmbinc! You pointed me to the right direction!This post is gold:https://www.eevblog.com/forum/testgear/rohde-schwarz-crtu-gpib-control/msg972794/#msg972794Question: what is the recommended GPIO adapter for Windows?Is this any good:http://www.ebay.com/itm/1pcs-New-Agilent-82357B-USB-GPIB-Interface-High-Speed-USB-2-0-with-CD-/182266409990?hash=item2a6fecb406:g:jBUAAOSw9IpXypomSeems a bit expensive, though...Going to take a look at the RS-232 port, meanwhile...Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: February 28, 2017, 05:24:41 pm
content: New question:I tested SCPI over RS-232 at 115200 baud, but getting the whole spectrum data takes too long for real time spectrum rendering in my application.While it is communicating at twice the speed of the chinese ADF4350/ADF4351 devices, it sends the measurements of each sample in ASCII, making the data much bigger...This kills the speed of the otherwise amazingly fast spectrum.How much faster would a GPIB to USB interface be? Would it be at speeds comparable to RS232 or more like Ethernet speeds?Regards,Vitor
Rohde & Schwarz CMU200 spectrum analyzer ui - Page 1
Forum section: electronics / testgear

author: usagi
author_rank: Frequent Contributor
timestamp: February 25, 2017, 07:51:46 am
content: You can hit R -> Pk to automatically move reference marker to the first peak, but Is there any way to automatically move reference marker to next peak, or automatically assign marker 1 or marker 2 to a peak?I know you can manually enter or jog dial marker 1 or marker 2. I can't find any way to automatically assign them to a peak.I can do this easily on my Agilent E7495A.Is the CMU200 SA UI just deliberately neutered?

author: sorenkir
author_rank: Regular Contributor
timestamp: February 27, 2017, 10:12:03 pm
content: I was thinking that we could do that through GPIB:- acquire the spectrum (READ:ARRay:SPECtrum:result:CURRent?)- process a peak search on acquired data- set markers on the 3 main peaksBut unfortunately, it seems that there is no remote control command to set a marker (except FETCh:SPECtrum:MARKer:PEAK? for the R -> Peak).According to the Operating Manual, the commands FETCh:SPECtrum:MARKer:ABSolute? and FETCh:SPECtrum:MARKer:RELative? do not affect markers in manual control.Michel.

author: richnormand
author_rank: Unknown
timestamp: February 27, 2017, 10:44:20 pm
content: Same with setting the peak amplitude manually. Looks like you can only set the reference level.I have not found how to do these in addition to jump peak to peak as you state.

author: usagi
author_rank: Frequent Contributor
timestamp: February 28, 2017, 08:58:49 am
content: also, can't see any way to change the screen colors. the white background is bad for contrast. would like to make the background black.
Fluke 8840A 09 AC option  - Page 1
Forum section: electronics / testgear

author: gogoman
author_rank: Regular Contributor
timestamp: February 26, 2017, 06:56:22 am
content: Hi looking for the 09 options for a fluke 8840a.PM me if you have one availableThanks

author: gogoman
author_rank: Regular Contributor
timestamp: February 28, 2017, 03:07:40 am
content: no luck yet
DSOXLAN questions - Page 1
Forum section: electronics / testgear

author: dav
author_rank: Regular Contributor
timestamp: February 28, 2017, 01:05:06 am
content: Some questions about the DSOX LAN module (I have an Anagram compatible one).1) Do I need a valid installed license to use it?2) Do I have to use a straight or a crossed LAN cable when connecting the scope to my router?3) Do I have to use a straight or a crossed LAN cable when connecting the scope directly to my PC (point to point connection)?4) Is there a default password?

author: TheSteve
author_rank: Unknown
timestamp: February 28, 2017, 01:41:29 am
content: Quote from: dav on February 28, 2017, 01:05:06 am1 - no2 - highly doubtful it matters, nearly every router is auto detect - just use a normal straight cable.3 - you could possibly need a cross over cable but your PC should have auto polarity detect. You would need to hardcode an IP in the scope or use a DHCP server on your PC for this application4 - a default password to do what?
Calibrate/zero a GDM-8251A Multimeter - Page 1
Forum section: electronics / testgear

author: AMWallace123
author_rank: Newbie
timestamp: February 27, 2017, 09:27:41 pm
content: I bought a used GDM-8251A Multimeter on EBay. When the meter is not in uses, it detects a constant negative (.0004) Amperes of current.This throws my measurements off by the same amount.What can I do to fix this problem?Can you zero or calibrate a multimeter?
HP410C teardown / restoration - Page 1
Forum section: electronics / testgear

author: vasi_ro
author_rank: Unknown
timestamp: February 26, 2017, 09:04:42 pm
content: I've started working at this vintage HP410C.Initial condition :

author: vasi_ro
author_rank: Unknown
timestamp: February 26, 2017, 09:11:44 pm
content: After cleaning inside , Buttons and meter :

author: Tony_G
author_rank: Super Contributor
timestamp: February 26, 2017, 10:48:56 pm
content: [Damn autocorrect - Just noticed that it said photocopier instead of photochopper]Nice.Is that photochopper the same one as in the 419A DC Null Voltmeter?TonyG

author: Tony_G
author_rank: Super Contributor
timestamp: February 27, 2017, 03:52:26 pm
content: I've heard many people talk about having the 419A turned off will help cause the photochopper to fail (the recommendation is to store the meter turned on) - Did you do anything to resurrect it or was it just working?TonyG
B&K Precision 3601 - Page 1
Forum section: electronics / testgear

author: 1lulu2
author_rank: Newbie
timestamp: March 01, 2017, 08:24:45 am
content: I viewed Dave's review on the B&K 3601, and it looks like a good piece of test equipment. I am sure someone has asked this question before, but I am starting to design MCU boards, etc. and I need a DC electronics load unit for prototyping, and testing, so should I buy the 3601, or build my own, or buy a cheaper, or more expensive one, etc? I was also looking at the Keithley 2380-120-60 -- more expensive unit. I am sure the lower the A and V loads, and precision, the more expensive the unit will cost!1lulu2

author: BU508A
author_rank: Super Contributor
timestamp: March 01, 2017, 10:25:39 am
content: Have you checked out the Maynuo M9812?http://www.ebay.de/itm/142232839855
monsanto 100C - i let the smoke out.  - Page 1
Forum section: electronics / testgear

author: worsthorse
author_rank: Super Contributor
timestamp: February 26, 2017, 10:19:15 pm
content: the first time i turned it on, the display lit up properly, but i didn't have a manual and couldn't figure out how to test it, so i turned it off. i finally got a manual, and i figured i would turn it on, test it and try to calibrate the unit. this time... sadness and gloom. the nixie tubes lit up but didn't settle into darkness or a displayed number and the counter isn't counting in test mode. and i smelled thatterriblesmell that suggests something popped.wondering if anyone here has repaired one of these beasts or for that matter any nixie tube test equipment before. i am not sure where to start. i am guessing the problem (or at least the first problem i can see) is before the nixie tube interface board. i mean i can dive in with a scope and DVM and start looking but some guru guidance would be appreciated.

author: cvanc
author_rank: Frequent Contributor
timestamp: February 26, 2017, 10:37:30 pm
content: I have no familiarity with this unit, but it's always a good idea to start with the basics...Power off and all cables disconnected, of course!Open it up and do a THOROUGH visual inspection (get your nose in there as well, follow the stink)Post enough high-quality images to the forum as possible so other eyes can be looking too (the folks here are generally super helpful)Be specifically on the lookout for evidence of overheating/burning/charring of all components and bulging/leaking of electrolyticsIf you find any tantalum caps test them to see if they are shortedIf possible, sort out where the power supply is and see if you can determine (even if only approximately) what the voltages might be (if you're lucky there will be clearly labeled testpoints)Good luck getting it fixed.

author: DaJMasta
author_rank: Super Contributor
timestamp: February 27, 2017, 01:26:36 am
content: Electrolytic caps would definitely be suspect with gear this old, and as always, it's good to start with voltages after your inspection. If you're probing inside with the power on, however, be especially careful of what your probe is touching (just what you want to probe) and what you are touching (make sure it's nothing). Of course you have mains power coming in to worry about, but nixies also generally need a high voltage to be used, so mains won't be the only parts to be wary of.Luckily, if you got a real pop and a sudden failure, a good inspection will probably show you the failure point. Checking other things is useful especially if you want to minimize the risk of the same sort of failure down the line, but you may not have to hunt around for the culprit of this failure too long.
monsanto 100c frequency counter - need manual - Page 1
Forum section: electronics / testgear

author: worsthorse
author_rank: Super Contributor
timestamp: February 14, 2017, 01:15:27 am
content: I just picked up a monsanto 100C counter, which appears to work, for six bucks. Now I am hunting for a manual for it. I'd hate to pay five times as much for the manual as I did for the gear and that is the going ebay price but my hours of interwebs searching has been fruitless. Do you have one of these counters? Or a manual PDF you'd be willing to share? PM, please! Thx - Bill

author: worsthorse
author_rank: Super Contributor
timestamp: February 26, 2017, 10:12:38 pm
content: update... i found a copy of the manual to purchase. i bought it even though i detest spending more for gear documentation than i do for the gear.
FLUKE 8600 A - Page 1
Forum section: electronics / testgear

author: stanko
author_rank: Newbie
timestamp: February 28, 2017, 06:25:38 pm
content: HI, i have fluke 8600 A multimeter,But IC SN 74188AN ( R O M ) , on the schemaic designated as U 9 is bad. Does someone have this IC to sel me or to send me info haw to provide it , this ROM IC need to be programed for this fluke multimeter.Best regrds Stanko YU1NS.

author: edavid
author_rank: Super Contributor
timestamp: February 28, 2017, 07:38:25 pm
content: You can program any kind of 32x8 or larger PROM to replace it, such as a small EPROM or EEPROM, or even a microcontroller. The attached file shows the contents.