hybridfree/eevblog-posts huggingface dataset:
Radio test set recommendations - Page 1
Forum section: electronics / testgear

author: k8tek
author_rank: Newbie
timestamp: September 20, 2016, 04:12:00 pm
content: Hello all,I am looking for < $1,000 options for a radio test set. I need to be able to make the following adjustments to the radio.measure power levelmeasure frequencygenerate frequencies to tune radioI would also like to use the test set as an oscilloscope and spectrum analizer. (tracking generator a plus, but not required)I don't know a whole lot about the Rhode & Schwarz CMU-200 but this looks like it might fit the bill. I was also looking at the HP 8924, but that thing is a dinosaur.

author: Brainbox
author_rank: Contributor
timestamp: September 20, 2016, 04:47:28 pm
content: The CMU200 is a great communication tester for frequency's from 10 to 2700 MHz.Almost all of them come with a load of options you will never need and never use.They are specific to test cell phones but for general tests of no use.You can simply remove those boards to speed up the start-up and reduce power consumption.Some of them also have the audio option to analyse audio signals and to generate them.

author: TheBay
author_rank: Unknown
timestamp: September 20, 2016, 05:02:27 pm
content: Quote from: k8tek on September 20, 2016, 04:12:00 pmYou don't state what use and frequencies needed?

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 20, 2016, 05:09:53 pm
content: I was in the exact same position about a month back. So I went and purchased a CMU200.It really is nice. Spectrum analyzer, signal generator, might have a second generator (mind the 2W input in that case!), power meter etc.You might get one with the B41 option, ie. audio analyzer.But here's the rub that I ran into. I cannot use the RF signal generator to put out 1kHz audio @ 3,5kHz deviation AND measure the radio equipments audio deviation at the same time. It's one or the other. Some might say it's doable with CMUgo or some other format of remote control.And the other rub, it does not show demodulated fm audio deviation from a received RF-signal! It is however possible to measure it manually using minimun and maximum values from the SA, but it's some work.So. I'm a bit stumped. Gladly I got it a tad under ebay-prices, but still.So I'm back at square one. Option 1, try to enable option K29 (AMPS) to see if that might help. But they're not available from R&S anymore. So that's that then.Option 2: Get another one, they are quite cheap - especially since Microsoft shut down factories in Finland.Option 3: Get a service monitor, CMT, CMTA, CMA, CMS. But these go for kidneys and testicles on ebay.So to sum it up; It's not the best service monitor, there are better (older) available for the same price that are better as service monitors.

author: k8tek
author_rank: Newbie
timestamp: September 20, 2016, 05:10:19 pm
content: 100 MHz to 1 GHz

author: TheSteve
author_rank: Unknown
timestamp: September 20, 2016, 05:11:47 pm
content: I'd recommend an HP 8920A, 8920B or 8921A - but they generally won't be in your budget.
Tektronix mainframe TM503A vs TM503B - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: September 20, 2016, 02:43:51 pm
content: My understanding is that the "B" version of these mainframes has an additional back-plane connector (2 vs. 1) for each slot?Is the B version backward compatible with the single edge connector modules such as the AM503, PS503 etc.?
Looking for documentation for Weir 4000 bench PSU - Page 1
Forum section: electronics / testgear

author: gerryk
author_rank: Newbie
timestamp: September 19, 2016, 09:18:21 am
content: I bought a Weir 4000 bench PSU a few years back, but am still not 100% clear on its operation.I have been looking for documentation for a while but to no avail. Any help would be appreciated.Image attached.ThanksGerry

author: MosherIV
author_rank: Super Contributor
timestamp: September 19, 2016, 01:03:38 pm
content: It looks pretty straight forward.It also looks faulty - looks like with no wires attached, it is going into current limit.Is that your issue?
New out of production Picoscope Scopes cheap on EBAY - Page 1
Forum section: electronics / testgear

author: serby
author_rank: Newbie
timestamp: September 20, 2016, 01:28:46 am
content: PicoScope has an official ebay channel and they add almost every day new auctions of brand new out of production scopes that sell at excellent prices. Also they ship at a flat price of 20$ around the world.http://www.ebay.co.uk/usr/picotechnology?_trksid=p2047675.l2559I got myself a nice MSO 3206 with just 325$ and that's insane considering it is a decent scope with a nice logic analyzer and a giant buffer!https://www.picotech.com/download/datasheets/PicoScope3200ABSeriesDataSheet.pdf

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 20, 2016, 06:24:11 am
content: yup but its a 500MS/s only, no screen and buttonstheir newer 1GS/s 3406 is like what? £1200 buy it now? insane! as usual as they were...

author: serby
author_rank: Newbie
timestamp: September 20, 2016, 02:19:42 pm
content: The new 3406D MSO is really expensive. The old 3406 MSO is limited with those 500MS/s but still a good product at that price point. Also the software has all the functions available for the new models (free CAN decoding, segmented memory, etc).It's not going to replace my good old TEK TDS7104. I'm going to use it as a logic analyzer and portable isolated scope (with a laptop). Also I think it can be really useful as a data-logger.
Rigol MSO1104Z options - Page 1
Forum section: electronics / testgear

author: Jeff5341
author_rank: Newbie
timestamp: December 17, 2015, 03:45:17 am
content: Has anyone been able to access the Rigol MSO 1104Z options? I tried the key generator, but got an invalid license message.Thanks, Jeff

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: September 17, 2016, 09:37:39 am
content: What options are you talking about?

author: Fungus
author_rank: Super Contributor
timestamp: September 17, 2016, 11:45:15 am
content: You mean unlocking extra features?It doesn't work on the MSOs.

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: September 20, 2016, 07:38:50 am
content: Quote from: Fungus on September 17, 2016, 11:45:15 amReally??? I've been discussing it in the other thread and nobody told me that!

author: Fungus
author_rank: Super Contributor
timestamp: September 20, 2016, 08:51:30 am
content: Quote from: psysc0rpi0n on September 20, 2016, 07:38:50 amOh, I thought you meant using the same methods as the DSOs.Itispossible to hack it but it's much more involved than just entering a code generated online using your serial number. You need to open up your 'scope and use a JTAG device to dump the contents of the flash memory for the keygen.I see you're already reading the "Sniffing the Rigol's internal bus" thread where this being discussed. That's the place to be.

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: September 20, 2016, 09:28:10 am
content: Quote from: Fungus on September 20, 2016, 08:51:30 amYes, I'm there! And I already know that it is possible and that it involves to get an FTDI JTAG dongle, assemble the wires to connect the dongle to the scope's JTAG header, dump the memory at the correct precise time and finally generate the keys... The trick will be to hit the spot, the correct timing to dump the memory!

author: qwertymodo
author_rank: Contributor
timestamp: September 20, 2016, 04:10:23 pm
content: What firmware are you on? I just successfully unlocked my mso1074z-s on fw 4.0.3.SP2 using the special version of rigup-0.4.1 and a jtag memory dump. It sounds like there might be a timing trick to when you need to take the memory dump. I would suggest halting the processor immediately after the rigol logo disappears and the options menu appears.Sent from my m8wl using Tapatalk
50% off Rigol Spectrum analyzer - Page 1
Forum section: electronics / testgear

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 18, 2016, 07:24:50 pm
content: http://www.rigol.eu/clearance/#a_DSA1030A-TG

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 19, 2016, 05:28:22 pm
content: Well..i bought a DSA1030A-TG Performance Spectrum Analyzer with 3 GHz Tracking Generator and a DG4162 160 MHz Arbitrary Waveform Generator. saved a wooping 2.670.- Euro. that is 3.290 US DollarVery happy, so now its just to wait for the carrier. Before i have bought at the clearance sale a MSO 1074Z Plus and a DP 800 series powersupplay. Everything was brand new.

author: pascal_sweden
author_rank: Super Contributor
timestamp: September 19, 2016, 05:38:11 pm
content: What about the warranty on such clearance products? Is it limited to only 1 month?

author: jjoonathan
author_rank: Frequent Contributor
timestamp: September 19, 2016, 06:09:16 pm
content: Yes, and while I can't speak for Rigol's DSA* devices, some unfortunate thermal-management choices they made years ago in the DS* series would likely bring back into their posession a considerable number of lemons. I'm not saying that the 90 day warranty on their deal basket is necessarily a mechanism with which to unload short-lived refurbs, but some amount of caution would probably be prudent.

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 19, 2016, 06:16:57 pm
content: Everything i bought has had two years waranty. Its stated in the text under each item, if how long the waranty is, nothing stated, its 90 days.Im just gona use the instruments for hobby use, so its not gone be any daily use.

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 20, 2016, 08:55:29 am
content: All the analyzers are now gone... :-) Some lucky people got -30 to -50% Off retail price.
BM235 sold out, wait til Nov? - Page 1
Forum section: electronics / testgear

author: Kuro
author_rank: Regular Contributor
timestamp: September 19, 2016, 05:54:33 pm
content: According to a German shop selling Brymen, the BM235 won't be available until late Oct, early Nov. Seems they've run out and won't start a new production run until late Oct.Possibly Dave has put too much strain on their BM235 stock, or he's bribed them or somethingSeriously, is this correct? TME also can't deliver. So I can stop looking if this will take til November before they're available again.
Xylinx published doc on GW Instek's use of the Zynq 7000  - Page 1
Forum section: electronics / testgear

author: Merlot1970
author_rank: Contributor
timestamp: September 19, 2016, 12:06:28 am
content: http://www.xilinx.com/publications/prod_mktg/zynq7000/goodwill-casestudy.pdf

author: saturation
author_rank: Super Contributor
timestamp: September 19, 2016, 11:33:11 am
content: Thanks for the refresher, that's from 2015 for the 2000E series.
[Gone!] HP 524A counter for free - pickup only Los Altos CA. - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: September 11, 2016, 09:40:47 am
content: From the Yahoo Agilent group.Email w1qg AT comcast DOT net if interested.https://groups.yahoo.com/neo/groups/hp_agilent_equipment/conversations/topics/78991;_ylc=X3oDMTJzc2Q0bDgwBF9TAzk3MzU5NzE1BGdycElkAzEwOTI5MzMzBGdycHNwSWQDMTcwNTA4MzY2MwRtc2dJZAM3ODk5MQRzZWMDZG1zZwRzbGsDdm1zZwRzdGltZQMxNDczNTU1NDkwQuote

author: Jwalling
author_rank: Unknown
timestamp: September 18, 2016, 11:29:03 am
content: It found a home and is saved from the trash heap.http://snyders.site/Pages/Electronics_HP_524A_Counter.htmlThe guy is looking for a service manual, if anyone has any leads.

author: bitseeker
author_rank: Super Contributor
timestamp: September 18, 2016, 11:27:55 pm
content: Cool, but what a beast! Glad someone could rescue it.
1976 vintage AM503 w/ P6303 probe restoration and probe calibration question - Page 1
Forum section: electronics / testgear

author: MarkoAnte
author_rank: Regular Contributor
timestamp: September 05, 2016, 01:08:45 pm
content: Hi,so I bought a 1976 vintage AM503 w/ P6303 probe. I have done similar stuff to my amp as is described here --->https://www.circuitsathome.com/measurements/spring-cleaning.It had some extra bad caps and a heat sink was missing form 1 transistor. But after that and a whole calibration and verification procedure form the AM503 manual the amp it self runs great now. The probe I'm not so sure.It seems that the core keeps getting a DC offset. Eg. I mesure 2 amps and it shows 2 amps. Then I turn 2 amps to 0.2 amps and it shows 0.3 - 0.4 A then I turn the current off and see that I have 0.2 amps DC offset. I then degause the probe and level it out again and its ok again. Sometimes it does this. Sometimes its ok. Sometimes after adjusting the probe (it has 4 pots - dc levelling offset and 3 frequency response & gain adjustments). It looks like even if I adjust it to where it is perfect it sometimes just goes off especially on higher sensitivity.Is this normal, that this probes are a bit touchy feelly. Like even handling it gives it a dc offset. I know that it can pick up the earths magnetic feald and that the presune on the core and its cover (different air gap) is critical to the reading. But is this like this for all the probes? Even new ones (the multiple K euro solution). Or did my probe just see better days? I would like to have another one maybe the newer ones (only 20 years old), like the A6303 to test them if they are the same.If anybody has any experience with restoring these probes please give me some tips.Best regards,Marko

author: radhaz
author_rank: Regular Contributor
timestamp: September 05, 2016, 06:36:44 pm
content: The Keysight probe I have at work recommends demagnetizing before each measurement.Demagnetizing Switch (DEMAG)This demagnetizes the core if it has been magnetized by switching the power on and off, orby an excessive input. Always carry out demagnetizing before measurement.The demagnetizing process takes about one second. During demagnetizing, a demagnetizingwaveform is output. Refer to “Demagnetization and Zero Offset" on page 17

author: MarkoAnte
author_rank: Regular Contributor
timestamp: September 06, 2016, 09:40:12 am
content: I do that, on this old one you have to press demag and then manual adjust a pot to center the waveform. But its still a bit iffy.

author: MF-jockey
author_rank: Regular Contributor
timestamp: September 18, 2016, 10:04:14 pm
content: There You can find the calibration instructions of A6303:http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/A6303.pdfBest Regards
HP 54120B digital 'scope mainframe  - Page 1
Forum section: electronics / testgear

author: bixbyru
author_rank: Newbie
timestamp: September 18, 2016, 09:04:24 pm
content: Hey all -The colour display on my "obsolete" 'scope appears to be a very nice Trinitron or similar, and is working just fine.However, it would be nice to not use it when possible, so as to save wear and tear.So... did HP reinvent the wheel, or is it more-or-less an SVGA monitor with a ribbon connector rather than a mini DB-15?Has anyone experience interfacing this beast to an external monitor...?Thanks in advance.
Siglent SPD3303C or other PSU in this price range ? - Page 1
Forum section: electronics / testgear

author: alin_im
author_rank: Regular Contributor
timestamp: September 18, 2016, 08:37:45 pm
content: Hey guys,I am looking to buy a cheap power supply for general purpose electronics and I was thinking at the Siglent SPD3303C (http://www.siglent.eu/spd3303c-0-30v-0-3amp.html). What do you think ? Any other suggestions in the 250-300 pounds ? A Rigol is too expensive for me at the moment, but I want to change the homemade ones that I made with LM317 and LM337.Thank you,Alin I.

author: tautech
author_rank: Super Contributor
timestamp: September 18, 2016, 08:48:19 pm
content: Not long sold one of those to a customer and while he was quite happy with it, he needed another and selected a SPD3303X-E of which he has sung its praises since getting it.http://www.siglenteu.com/pdxx.aspx?id=1116&T=2&tid=17Had a little fiddle with both as my normal pre-sales check and the SPD3303X-E has a much nicer UI.
CEM DT-9989 multimeter teardown and review by Jim Conner - Page 1
Forum section: electronics / testgear

author: retiredcaps
author_rank: Super Contributor
timestamp: September 18, 2016, 09:25:36 pm
content: Just watching this now and haven't seen it all.At the 8:50 mark, it didn't surprise me.This is CEM soldering and quality control.Pretty sad for a $500 USD meter.

author: Lightages
author_rank: Unknown
timestamp: September 19, 2016, 03:28:53 am
content: Perhaps t is not my place to talk about this meter because of my affiliation, but WTF? I guess I am not surprised. CEM made meters have had a long history here of bad quality control. This seems to also have a bad UI and utility with the Bluetooth failure, again WTF?
Hantek HDG2022B - Page 1
Forum section: electronics / testgear

author: Simon
author_rank: Unknown
timestamp: September 18, 2016, 06:06:40 pm
content: I have 1 of the above-mentioned horrible signal generators. I thought it would be fairly decent for what I need at the moment as I generally work at low-frequency so with 250 mega samples it should adequately cope with producing faithful renditions. What could be simpler than producing a square wave? At 500 Hz that means that the whole cycle is made up of 500,000 points and at a 50% duty cycle that would be very easily be 250,000 points low and 250,000 point hi. Why then does the high to low transition at 10 V the maximum output although I was sure it went to 20 V take place over 5 or 6 steps with an awful ring on each step? If I step down to save 300 Hz the transition is almost perfect if I step down further all of a sudden there are lots and lots of tiny smaller transitions but I don't understand why they are necessary. It's not critical what I'm doing at the moment but a 555 timer would do a damn sight better job than this so-called signal generator or function generator or whatever this pile of soon-to-be scrap is called. I can understand that at a high frequency or a really odd ball frequency that does not match up with the 250 mega sample output but at 500 Hz where there is a perfect amount of points?
HP 54645D  How can I adjust trace rotation? - Page 1
Forum section: electronics / testgear

author: Landav
author_rank: Newbie
timestamp: September 17, 2016, 08:48:01 pm
content: From lurking on the forum, I know that many here are fans of the HP/Agilent/Keysight 54645D unit.I have recently gotten one that experienced some less than gentle handling during shipment.The display comes up, and the corners are square, but the display is rotated a few degrees from vertical.The CRT seems to be sitting square with respect to the front cover, so I suspect that there must be some sort of rotation adjustment that can address this.I have not opened the unit up yet. I downloaded the manual, and I reviewed Chapter 8 regarding adjustments. The chapter refers to horizontal and vertical holds, brightness, etc., but I don't see anything about rotation adjustment.So, I am seeking knowledge and advice from the many experts here as to how to adjust this before I go tearing into the unit.Any help or insight is greatly appreciated!!

author: alank2
author_rank: Super Contributor
timestamp: September 17, 2016, 09:21:21 pm
content: I just got a 54645D as well and mine is ever so slightly rotated too. I did _not_ see an adjustment mentioned in the manual where it does mention other adjustments, but that doesn't mean there isn't one on the pcb.

author: rob.manderson
author_rank: Regular Contributor
timestamp: September 17, 2016, 11:51:16 pm
content: I think this is a TV type CRT - not a traditional oscilloscope CRT - if so you'll find a set of coils around the neck of the CRT - they are the deflection yoke. Close inspection will show a clamp around the neck as well (part of the deflection yoke). Loosen it and (gingerly - there's probably some volts around there!) rotate the yoke in relation to the CRT. You'll see the image rotate.Sorry if the explanation seems vague - it's very hard to describe and I don't have a single TV type CRT left to photograph!

author: Landav
author_rank: Newbie
timestamp: September 18, 2016, 12:34:24 am
content: Thanks, Rob!Hopefully, I will get a chance to open it up towards the end of the week, and I will look for that clamping/ deflection yoke mechanism. Sounds like an easy fix!

author: alank2
author_rank: Super Contributor
timestamp: September 18, 2016, 12:57:22 am
content: Landav - if you get a chance take and post some pictures!

author: Landav
author_rank: Newbie
timestamp: September 18, 2016, 02:44:31 am
content: Will do...
Rohde Schwarz scope are this perfect ? - Page 1
Forum section: electronics / testgear

author: ebclr
author_rank: Super Contributor
timestamp: September 15, 2016, 10:43:09 am
content: I don't know the price but appear a perfect scope for mehttps://www.youtube.com/watch?v=F9Ssvtm524M&feature=youtu.be

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 15, 2016, 12:04:32 pm
content: Pricing :http://www.testenmeetwinkel.nl/nl/producten/oscilloscopen/rohde-schwarz/rth_1002E2790 for 60M base unit, but looks like everything is software upgradeable.>E8K for 500M MSO with decodesCaptouch may compensate for the traditional problem with portable scopes - lack of knobs.

author: JPortici
author_rank: Super Contributor
timestamp: September 15, 2016, 12:12:21 pm
content: holy shit!i know that probably it's competitor is the tektronix TPS but the price on this one is insane (4200 for 100 MHz + 969 euro for i2c/spi decoding???)i also doesn't have a video outputbaseprice on R&S shop is 3.685,00

author: nctnico
author_rank: Super Contributor
timestamp: September 15, 2016, 12:31:28 pm
content: Unfortunately R&S options are insanely expensive. I'd ask for a free option bundle and if no I'd buy something else.

author: JPortici
author_rank: Super Contributor
timestamp: September 15, 2016, 01:51:11 pm
content: huh, i re-checked the prices. it's absolutely on par with the TPS2000B but with 50 times the memory

author: EEVblog
author_rank: Unknown
timestamp: September 15, 2016, 01:53:12 pm
content: I just played with one today. R&S themselves told me the firmware is, umm,They wanted to send me one but were embarrassed to send it in it's current state

author: testmode
author_rank: Regular Contributor
timestamp: September 17, 2016, 09:04:28 am
content: Quote from: EEVblog on September 15, 2016, 01:53:12 pmI hope R&S will eventually get the implementation right. Given their reputation, I am counting they could deliver. Even if it is expensive now, if it picks up interest in the market with its compact form factor and R&S badge, hopefully it could trigger "inspirations" for competitors for the next generation of scopes - cordless handheld. And with healthy competition, there's only one way for the price to go - down. Although it can be argued that handheld scopes have been existing in the market for a while now, the implementation has been mostly well....unappealingI can relate this with power tools too. With the advent of Li-Ion batteries + brushless motors and after having had one, I find it hard to go back to corded tools anymore. Of course unless you specifically need the power that only corded tools could offer.
MSO X4024A strange meas values - Page 1
Forum section: electronics / testgear

author: klaus1311
author_rank: Contributor
timestamp: September 16, 2016, 01:13:30 pm
content: Hello,my name is Klaus and this is my first time I write in the this forum. I have a Keysight MSO X4024A. While I was working with it, I stumbled over a strange display value when using the "meas" option and only DC or no signal is connected. Depending on the atternuator setting it shows different voltages:Att 50 V = 5 - 7VAtt 20 V = 2.7Vand so on, it's roughly 1/2 of the previous value.Can anybody confirm this behavior, or is this just a problem of my scope?My current FW: 04.08.2016071800Klaus

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: September 16, 2016, 03:45:24 pm
content: Hi Klaus,The noise of the scope (and any scope, generally) is directly related to the attenuation settings of the front end. Typically, the noise on the scope is a combination of the signal offset and the screen scaling. For the 4000 X-Series, page 24 of the data sheet specs the "DC vertical gain accuracy" as +- 2% of the full scale (assuming 1:1 probing attenuation). Then you have +-.1 divisions of "DC vertical offset accuracy".The reason it's like this is that the scope's front end attenuates the signal for the ADC in such a way that the ADC gets similar voltage ranges regardless of the front end's attenuation settings. This is why when you go from 50 to 20 your noise % is roughly the same.This is a pretty common question, let me know if I didn't explain well enough!-Daniel
Low cost LED panel light for following internal traces on multilayer PCB's - Page 1
Forum section: electronics / testgear

author: _Wim_
author_rank: Super Contributor
timestamp: September 15, 2016, 06:54:31 pm
content: Hi, probably many of you already know about these, but I just bought a small square LED ceiling light to put under a multilayer pcb to be able to follow the internal traces more easily (the area that is not covered by the pcb I cover with some paper so it is not too bright on the eyes). I comes with its own constant current source (300mA), but you can off course also power it from your lab power supply to make it adjustable. The can be found on Ebay for aprox 16€ including shipping from various sellers:http://www.benl.ebay.be/itm/12W-Square-Ultra-Thin-LED-Panel-Ceiling-Light-Flat-Tile-White-30-x-30-x-1-2-cm-/351714691165?hash=item51e3d4485d:g:NvoAAOSwlfxXGaO6http://www.benl.ebay.be/itm/12W-Square-Ultra-Thin-LED-Panel-Ceiling-Light-Flat-Tile-White-30-x-30-x-1-2-cm-/131842231341?hash=item1eb268cc2d:g:GREAAOSwLnBXV~6t...I have been running is for 1 hour now at full power, the white surface does not heat up at all (no leds underneath), and the sides heat up to around 40°C. The light is pretty uniform and sufficiently bright to see internal traces. So far quite satisfied with my purchase.
Rigol DS1054Z I2C decoding strange behavior - Page 1
Forum section: electronics / testgear

author: oldprogrammer
author_rank: Newbie
timestamp: September 15, 2016, 02:28:07 am
content: see pics here -http://imgur.com/a/6EOxjWhen I set the decode options to display data in ASCII (bottom pic with all EEEE), the bytes are shown correctly. When I set to display in Hex, byte frames are blank. Anyone run into this? Thanks!

author: rstofer
author_rank: Super Contributor
timestamp: September 15, 2016, 03:10:06 am
content: There might not be enough space in the little box for the HEX representation. Speed up your Time/div to display fewer but wider boxes.
Shortest interval time for repeat triggering of scope, writting acquired data? - Page 1
Forum section: electronics / testgear

author: Plasmateur
author_rank: Regular Contributor
timestamp: September 14, 2016, 02:19:28 am
content: This question pertains especially to the owners of a Tektronix DPO3054 or Rigol 1054z oscilliscope, but those with knowledge about the process may know exactly what I'm looking for.I'm attempting to trigger my scope, and then write the acquired data to disk in the shortest amount of time. The shortest interval I am able to achieve is ~ 1 second.Setup:1.) Pulse delay generator is used to trigger Tektronix DPO3054 and a AWG which is connected to the scope.2.) Labview communicates through GPIB to pulse delay generator - clock starts3.) Pulse delay generator triggering AWG and scope4.) Labview acquires data writes in binary format on hard disk via USB - clock stops. ~ 1 second has passed.5.) Repeat steps 1-5.If I could reduce the interval of this process by a factor of 10 or more, this would optimal.Does anyone have experience in this area?

author: joeqsmith
author_rank: Super Contributor
timestamp: September 15, 2016, 11:19:01 pm
content: How much data? How does the PC interface with the DSO? What's the BW of this interface? What is the bottleneck?

author: Someone
author_rank: Super Contributor
timestamp: September 16, 2016, 12:09:13 am
content: This is typically done with a digitiser, which is basically the same as a scope front end but has a faster interface to the host environment. Then you can have high speed storage attached to your computer/server etc and save the data much faster than with an oscilloscope. Some scopes are better than others of course:https://www.eevblog.com/forum/projects/software-tips-and-tricks-for-rigol-ds200040006000-ultravision-dsos/msg908494/#msg908494
Tek PG506  - Page 1
Forum section: electronics / testgear

author: dan3460
author_rank: Frequent Contributor
timestamp: September 13, 2016, 12:01:59 pm
content: Does anyone knows where I can find the older manual and calibration procedures for the Calibrator above? I can found in the internet plenty of copies for series B040000 and up but nothing before that.For the calibration procedures you are supposed to feed some current on specific places but what is shown on the manual that I have does not correspond at all with what I can see on my board.Thanks for the help,

author: David Hess
author_rank: Super Contributor
timestamp: September 13, 2016, 10:57:03 pm
content: Artek Manuals has the service manuals for both the early and late PG506.
Need Schematics for National VP-9611G Voltmeter - Page 1
Forum section: electronics / testgear

author: balu
author_rank: Regular Contributor
timestamp: May 03, 2014, 05:06:57 pm
content: Hi eevblog'ers,I got a National VP-9611G Voltmeter with the user manual. And now I’m looking for the schematics and/or a service manual. If anyone can share this or can provide a link, would be great. If anyone need the user manual, I can provide this as an pdf.Thanks and regardsBalu

author: balu
author_rank: Regular Contributor
timestamp: May 10, 2014, 07:45:54 pm
content: Hi eevblog'ers,I made some pictures of the National VP-9611G Voltmeter.

author: balu
author_rank: Regular Contributor
timestamp: May 10, 2014, 07:49:56 pm
content: And more pictures.

author: chr15
author_rank: Newbie
timestamp: September 12, 2016, 03:58:56 am
content: Hi Balu,Was wondering if you ever managed to find a schematic for the VP-9611 Voltmeter?Mine runs fine on all but the highest three settings 15v 50v and 150v, where a small signalcauses the needle to go hard deflection full scale?Anyway...RegardsChris
DEKABOX DC-40 Zero Capacitance. - Page 1
Forum section: electronics / testgear

author: rastro
author_rank: Frequent Contributor
timestamp: September 11, 2016, 04:49:47 pm
content: I have a DEKABOX DC-40 decade capacitor. Problems with zero and lowest setting.My "zero capacitance" setting consistently reads ~30.6 pF which is twice as high as the label "15uuf" (15pF). The unit seems very repeatable after initial cleaning.I've cleaned the contacts on all rotary contact switches using 98% IPA and contact cleaner. Accounting for the nominal 30pf offset, all selections come in under 1% error - with the exception of the lowest value (100pf) which is 1.8% high.I measured input of both sets of rotary contacts separately (disconnected) and they each read close to 15pf when set to zero capacitance. Since they are connected in parallel inside the unit this would come out to the 30pf (makes sense). It seems odd they both read the close to the same 15pf. It leads me to believe both have a similar problem.Measured with DE-5000 (setting: (Cs at 1 KHz) using TL-21 (alligator clips). Shows 0.3pf with no connection - so I'm confident it's not an offset issue with the test setup.Does anyone have a DC-40 they can read the capacitance when all is set to zero?

author: ebclr
author_rank: Super Contributor
timestamp: September 11, 2016, 05:07:55 pm
content: Did you try connecting guard to gnd ?

author: SeanB
author_rank: Super Contributor
timestamp: September 11, 2016, 05:13:06 pm
content: Try to zero it again with the leads as shown when measuring. Also, connect the ground lead, it will make a difference.Most of the error is just a connection issue, as the rest of the selections do read correctly with a fixed offset.

author: rastro
author_rank: Frequent Contributor
timestamp: September 11, 2016, 09:31:39 pm
content: You're both right - it was because the guard not connected.After I plugged in the guard the reading went to 10.8pf from 30.6pf. Thanks for pointing me in the right direction.Still the lowest setting 100pf is over 1% - it reads ~101.5pf after subtracting the offset (So close). I took the cover off and read the 100pf capacitor directly (with the guard) and it reads 100.2pf - so it's well within it 1% marking (probably in the noise range of the meter also). I doesn't look like the capacitor is faulty. I've gone through and cleaned and pushed on the contacts. I don't want to chance damaging the contacts.Overall I really can't complain since everything else is well within specifications and each switch setting gives very repeatable readings.-rastro
Voltcraft m4660m strange behaviour - Page 1
Forum section: electronics / testgear

author: Hrvoje-CRO
author_rank: Contributor
timestamp: September 10, 2016, 11:39:37 pm
content: Hi!It seems something happened to my multimeter. In AC mode (750V) instrument shows values up to 80V when nothing connected to it, but not the all time! Also in resistance (20M) instrument shows values also when nothing connected. Check a video:http://sendvid.com/b3qhsxe5What could be a reason of that strange behavior? I opened it and cleaned but after that the instrument itself is not accurate any more:( Maybe i've touched trimmer pot's during cleaning and messed up the values.Thank you in advance!Hrvoje

author: retiredcaps
author_rank: Super Contributor
timestamp: September 11, 2016, 07:19:54 pm
content: 1) Post clear focused pictures of the insides of the pcb (both sides).2) Do you have another working meter to make measurements?3) Your Voltcraft looks like a rebranded Metex M-4660M.4) What kind of cleaning did you do on the inside? Any bit of dirt, contamination, debris, can cause erratic readings.
Tektronix 2230 cal button problem - Page 1
Forum section: electronics / testgear

author: nkurtar
author_rank: Newbie
timestamp: September 12, 2016, 01:28:09 am
content: Hello,I am trying to put the cal button back in its place. But can t fix it and get the cal button locked. There is a plastic shaft arounf 2 inches long after the vertical knob removed. A kind of thin plastic shaft scares me to break it. Help me out. By the way cal button screw fixed type. But cal button turns freely even if i tightened the screw.
Replacement probe for Kenwood FG-273A function generator - Page 1
Forum section: electronics / testgear

author: eeguy
author_rank: Regular Contributor
timestamp: September 09, 2016, 09:18:48 pm
content: Hello, I bought a Kenwood FG-273A function generator in the past. I lost the probe. Any idea on where to get a new one? Which product/specifications do you recommend?

author: rdl
author_rank: Super Contributor
timestamp: September 10, 2016, 01:25:21 am
content: Function generators don't usually come with probes. The outputs on better ones will have BNC connectors on the front panel with 50 ohm impedance. What you use to connect to them is mostly determined by what kind of device you are connecting to. You can find 50 ohm coax cables with BNC connectors on one end and just about anything you could want on the other end. You don't always need 50 ohm coax. I have a BNC to banana jack adapter I use a lot.
GW Instek GDS2000E - Page 1
Forum section: electronics / testgear

author: PigSpark
author_rank: Contributor
timestamp: September 09, 2016, 09:13:00 am
content: Firmware 1.25 is up on the website!

author: Fungus
author_rank: Super Contributor
timestamp: September 09, 2016, 09:31:12 am
content: Does it fix any of the bugs?

author: PigSpark
author_rank: Contributor
timestamp: September 09, 2016, 01:35:57 pm
content: Will try it when I get home tonight, what bugs are you seeing?

author: wraper
author_rank: Unknown
timestamp: September 09, 2016, 02:04:17 pm
content: Quote from: PigSpark on September 09, 2016, 01:35:57 pmHe does not own such scope. It's all about feud.

author: saturation
author_rank: Super Contributor
timestamp: September 09, 2016, 06:11:59 pm
content: Can you let us know what changes there are? Your note made me check the 1054B its also got new firmware for my DSO dated 8 31 2016, but accessible now only after "members" registration.

author: Fungus
author_rank: Super Contributor
timestamp: September 09, 2016, 07:17:14 pm
content: Quote from: wraper on September 09, 2016, 02:04:17 pmDo I need to own one to ask that?
The Cathode Ray Oscilloscope 1944 US Navy Training Film - Page 1
Forum section: electronics / testgear

author: jesuscf
author_rank: Frequent Contributor
timestamp: September 11, 2016, 05:01:52 am
content: Lots of fun watching how oscilloscopes were used back in the day:

author: ADT123
author_rank: Regular Contributor
timestamp: September 11, 2016, 06:05:53 am
content: Great find - shows the basics have not changed much in over 70 years.
Tektronix A6302 and A6312 Current Probes - Page 1
Forum section: electronics / testgear

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: September 08, 2016, 02:10:06 pm
content: I'm trying to get set up with an AC/DC current probe capability that's around 20A and 20-50MHz but I'm on a budget. I actually have an Agilent MSO7104B so I could work with their Autoprobe 1147A/B or N2893A probes but they are hard to come by and cost an arm and a leg and an eye.I recently bought a pretty beat up A6302 with an AM503 Amp in a TM502A housing, the eBay listing which was 'used' included pictures of it 'working' i.e. showing a trace on a scopehttp://www.aplussurplus.com/mirror/63306a.htmand I can replicate something similar but the indication I get is all or nothing meaning I can set the trace at zero when there's no DC current and see the trace jump up to a steady line when there's 2A flowing through the probe but there's no linearity - e.g. I'd expect half the Y deflection at 1A but that's not the case. Maybe it's operator error, maybe the probe is junk, maybe the AM503 is junk, maybe a combination of all 3!I cleaned up the probe and it looks like it might well be serviceable. Given that I paid less than $200 for the lot, I'm keen to see if the probe works so I bought a clean 'used' AM503B from eBay that's on its way to me; if that works with my probe, I'm happy. I may try to repair the AM503 if I get time.Any advice on tests I might perform or known points of failure for the Tektronix probes and Amp would be appreciated. I changed from using a switched mode PSU (Extech 382260) to an old linear PSU to generate the DC current and now I get uniformly linear change on the scope as I ramp the DC current up, looks like it's working after allI think the bezel behind the knob is supposed to light up but it doesn't - in fact nothing at all lights up on the AM503; I think it's RTFM time. Opened up the probe and found that a white wire with black tracer was broken, it was the signal from the switch to indicate that the probe was open, some work under the microscope put that back as it should be and now I get the 'open' indicator LED lighting up on the AM503
Fluke PM97 scopemeter power measurements - Page 1
Forum section: electronics / testgear

author: Chaoswarper86
author_rank: Newbie
timestamp: September 07, 2016, 08:11:27 am
content: Hello everyone!I'm new on the EEVblog forum! Greetings to Dave!I'm from Finland so my English is not perfectFew days ago I recieved my first scopemeter ( FLUKE ofcource) from German ebay seller. I've notised that this scopemeter can measure power consumption with voltage and current with Fluke i1010 current clamp. I work as an electrician in big sawmill, and many motors there are runned via inverter. Sometimes one motor take overcurrent without reason and inverter goes down. Motor seems to be alright, phase resistance is similar and there is no earth leakage on windings. I wonder can the switching frequency 10 KHz of the inverter confuce the scopemeter if I measure motor power consumption after inverter? Motors are 3 phase ( 400 V ) ofcourse so I can only measure power at single phase at the time but It should be identical at all phases. Does anyone have experience about these measurements?

author: Zermalmer
author_rank: Regular Contributor
timestamp: September 07, 2016, 09:41:34 pm
content: Hi,I'm not familiar with engine mesurment with scope meters...I take a look to the manual of the PM97 (http://assets.fluke.com/manuals/93_95_97umeng0000.pdf)... on Chapter 5-10 the manual describes how to measure a 3-phase Y connection... maybe this can help you.QuoteYou are experienced... so expect the unexpected... only if you really measure on all 3 phases the same, THAN you can say that they are identical....I hope some more experienced users can halp you more...best regards
Clamp Meter Adapter for BM235? - Page 1
Forum section: electronics / testgear

author: rmkilc
author_rank: Newbie
timestamp: September 07, 2016, 05:23:11 pm
content: I currently have a cheap $60 clamp meter, and I find the clamp feature to be very useful around the house and on automobiles. I am looking at upgrading to the BM235, but is there a way to add a clamp adapter to it or no? I have searched through the forums and videos and I mostly see DMMs being used over clamp meters. Why are clamp meters less popular?

author: omgfire
author_rank: Regular Contributor
timestamp: September 07, 2016, 06:36:39 pm
content: Quote from: rmkilc on September 07, 2016, 05:23:11 pmYes, but why do you want clamp adapter over clamp meter?https://www.eevblog.com/forum/testgear/do-affordable-current-clamp-adaptors-exists/

author: Lightages
author_rank: Unknown
timestamp: September 07, 2016, 06:41:22 pm
content: Quote from: rmkilc on September 07, 2016, 05:23:11 pmClamp meters are generally less accurate for current measurement and as such the extra bulk the mechanism takes up and its extra cost are not wanted. Clamp meters excel where you should not, cannot, or is dangerous to break the circuit path and measure the current flow directly. Most times this will be in power distribution boxes, very high current applications like starter motor circuits in cars, or where there is no way to disconnect the current path without permanently altering the wiring.The BM235 is a good choice but adding a current clamp to it depends on what you want to measure. I suggest it is better to have the BM235 and a separate clamp meter so you can measure current and voltage at the same time.

author: rmkilc
author_rank: Newbie
timestamp: September 07, 2016, 08:13:53 pm
content: Is there a comparable clamp meter to the BM235 within the same price range?

author: Lightages
author_rank: Unknown
timestamp: September 07, 2016, 10:17:06 pm
content: Yes there are a couple. Of course this Brymen:http://www.tme.eu/en/details/bm065/meters-and-acdc-clamp-probes/brymen/Or the Uni-T option for lower current options:http://www.ebay.com/itm/UNI-T-UT211B-60A-True-RMS-Mini-Clamp-Meter-AC-DC-Amp-Volt-Ohm-Capacitance-Tester-/301995040981?hash=item46504ea0d5:g:PrgAAOSwvg9XbP10orhttp://www.ebay.com/itm/UNI-T-New-True-RMS-AC-DC-Current-Mini-Meters-Capacitance-Tester-UT210E-BI187-/191949481728?hash=item2cb114a700:g:5GIAAOSwZVlXttVQIMHO stay away from Mastech.
Agilent Power Supply Fever - Page 1
Forum section: electronics / testgear

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: September 13, 2016, 11:43:53 pm
content: After watching Dave add binding posts to his Agilent 6643A on the same day that I (yet again) had issues with my switch-mode Extech supply, I started taking a look the Agilent 66XXA supplies and saw that they are seriously awesomely built. Anyway, I have now bought 3 on eBay: a 6642A, a 6643A, and a 6623A, all apparently working and all at reasonable cost. I must be crazy but I guess I can sell them for around what I paid. Here's what I'm thinking:6642A and 6643A - Clean up, add missing parts (knobs and feet), maybe add binding posts.6623A - I was unaware of these until today, they have 3 dual-range outputs that scale between a high and low range so, for example, one of the outputs can run 7V at 10A or 20V at 4A, if you go over 7V it auto-shifts up to the 20V range but then is limited to 4A. All the outputs are isolated from each other and ground. Apart from the rear terminals, the biggest issue with the 6623A is that it has no rotary encoders on the front so you have to enter any changes to voltage and current from the keypad. However, there's apparently an RS232 input on the back from which you can control everything so how's this for a neat conversion idea. Add 3 sets of binding posts, 3 rotary encoders and 3 buttons. Now add a microcontroller and program it so that it sends the correct signals to the serial port when the buttons and encoders are operated?

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: September 18, 2016, 12:34:52 am
content: So far I received the 6642A and the 6623A. The 6642A is really nice, it's small, has 2 encoders, and the inside oozes quality. The 6623A is just a bit too big, it's 20 inches deep which makes it awkward to put on a shelf, I like the triple output but it's just BIG.I cleaned up the 6642A, did a repair on the encoders which were coming apart. I've ordered some beefy binding posts and plan to do the conversion to front outputs like Dave did. I'll do the same for the 6643A when it arrives. Not sure what to do with the 6623A yet.I'll post some pictures next week.
Hantek HDG2002B Factory Reset? - Page 1
Forum section: electronics / testgear

author: nathusius
author_rank: Newbie
timestamp: September 07, 2016, 09:45:28 am
content: Hi, I'm a newbie here, so apologies in advance if this question has already been answered, but I did try searching for it first!I have a Hantek HDG2002B which will not turn on, it will only display a blue screen with the message "Sorry, the application has no response! The system will restart after 30s"It is stuck in a loop and displays the same message again after it restarts, or if I switch it off and on again; removing the backup battery does not help!I was trying to edit an arb waveform and think that I might have changed some settings incorrectly, so is it possible to reset the factory default settings, maybe with a jumper on the PCB?Earlier I had installed the latest firmware from the Hantek website (afg_hdg2000b_160411.upk) and it was working OK after this, although there were some crashes with the same message displayed, but the unit recovered from these after a power cycleThe serial number is DDS2300248Any help or advice would be greatly appreciated!
Teardown & Analysis of an Agilent 86109B Optical/Electrical DCA-X Module - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 04, 2016, 01:07:01 am
content: You can watch the video here: [30 Minutes]youtu.be/HemdbqcQAC0More videos at The Signal Path:http://www.TheSignalPath.com

author: Dr. Frank
author_rank: Super Contributor
timestamp: September 04, 2016, 10:48:56 am
content: Just beautiful video / pictures.What a magic of Electrodynamics!Frank

author: Muxr
author_rank: Super Contributor
timestamp: September 04, 2016, 01:04:21 pm
content: Enjoyed that teardown.. thanks Hugoneus!

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 04, 2016, 10:20:54 pm
content: Thanks!

author: TerraHertz
author_rank: Super Contributor
timestamp: September 04, 2016, 11:24:22 pm
content: I love looking at spacejunk like this, for the beauty of the designs.It's too bad most such 'really dead' bits of high tech gear seem to be dumpstered, rather than put on ebay with low prices.How did you find that one, if I may ask? Because I have a HP 83480A digital communications Analyzer, with no modules.https://www.eevblog.com/forum/testgear/hp-83480a-digital-communications-analyzer-teardown/I've been hoping to find dead modules and perhaps component swap to end up with a working one, but didn't see any 'dead, for parts' ones yet.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 05, 2016, 07:09:25 pm
content: This was a dead module that was given to me by a friend. I'll keep an eye out for the modules you are looking for, I will let you know if I come across any.

author: Lukas
author_rank: Frequent Contributor
timestamp: September 06, 2016, 09:35:41 am
content: Relevant HP Journal:http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1996-12.pdfThere's a nice cross-section view of the O/E converter on page 30.