hybridfree/eevblog-posts huggingface dataset:
DSO display delay and discontinuous scope behaviour - Page 1
Forum section: electronics / testgear

author: KedasProbe
author_rank: Frequent Contributor
timestamp: April 15, 2014, 05:59:23 pm
content: I was curious if I could see the delay between signal at the (probe) input and seeing it on the screen.So I did connect a square wave at the input and also to a red led.(The led is the reference to see when the square wave is high)Now I captured the screen at 5x faster speed. (digitally I slowed it down 2x to get a total of 10x, 0.1s->1s)The scope triggers on rising and falling edge.I marked "out of sync" in the video when you see that the scope is not longer in sync with the led (the source).I did not see an obvious (big) delay BUT I did see that the scope (my HMO1022) doesn't behave the same all the time. Sometimes it is going out of sync and shows the falling and rising edge at the same time in one screen update, even the out of sync behaviour does not seem predictable.Any idea why it has trouble behaving the same all the time? (the input signal is the same)It does look like it displays all edges (20/s) just not the same way over time.Is this some intern interrupt for something hence changing its behaviour?Does your DSO also show such different behaviour while your signal did not change?(the square wave of 10Hz is amplitude modulated with a 2Hz triangle to make it easy to see multiple edges)
Agilent MSO7054B new-user question - Page 1
Forum section: electronics / testgear

author: Sailor
author_rank: Regular Contributor
timestamp: April 15, 2014, 09:23:31 am
content: My ebay present arrived this morning - an unmarked, looks-like-new MSO7054B.But almost immediately I had to go out working on the water, so I haven't had much time to playEverything seems to work as expected, except for one thing (there'salwaysjust one thing!) In spite of it having 8MSa memory, all the acquisition setups, horz time/div, etc seem to lead to sampling rates that lead to just 1Msa being acquired, and that's in SINGLE-SHOT mode. If the trigger is NORMAL, the sampling rate drops to half of the SINGLE mode. That last bit is explained in the User Manual, except in the reverse sense i.e. SINGLE is bigger/better. As an example of what I am talking about, setting the timebase to 10ms/div and doing a SINGLE acquisition causes the sampling rate to be just 10MSa/sec.Is there something that I am missing, that allows me to force a higher sampling rate, or ...?I hope someone has good news.Sailor

author: Carrington
author_rank: Super Contributor
timestamp: April 15, 2014, 09:59:44 am
content: I feel that you need to install the 8M option to get 80Msa/s @ 10ms/div (single).

author: Sailor
author_rank: Regular Contributor
timestamp: April 15, 2014, 10:08:15 am
content: Thanks, but I thought that it's not an option - it's standard on these scopes. Unless I'm wrong, which has been known before now

author: Carrington
author_rank: Super Contributor
timestamp: April 15, 2014, 10:17:17 am
content: The 8 Mpts MegaZoom III deep memory is also a standard for 6000 series now,but not in the past. It might be your case, please check what options are installed.

author: Sailor
author_rank: Regular Contributor
timestamp: April 15, 2014, 11:27:26 am
content: Hmmm... that's interesting. I have data sheets for the 7000A (dated 2007) and the 7000B (dated 2011), and they both say 8M is standard. I believe that my scope is 2010. I also have User Guides, one of which is for the 5000/6000/7000 series (dated 2009), and one is for the 7000B series alone (dated 2010). Both of these manuals list the mem8M option in the section describing options and licenses, but they both also say that it's standard on the 7000 series. The thing is, when I flicked up the options list on the screen this morning, I don't particularly recall seeing it listed. At the time, I wouldn't have even noticed that it wasn't there, nor even thought about it because I believed that it was standard. The ordering info for all the model variants in the data sheets show the 8M as standard. I'll have another look at the installed licenses tomorrow morning.Again, thanks.
New here....so what gear do I need? (PLEASE read!) - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: April 15, 2014, 03:02:07 am
content: JUST KIDDING..... I have enough for what I need to do as a hobbyist, and at work, well some pretty fancy stuff that makes me wish.....But what I really probably need though is help for what my wife calls a "fetish", (test equipment).I buy it when I see it and especially if the price is right.Like the Fluke 10 missing one lead for 5 bucks, because it was missing one lead....at the swap meet last Saturday. I have performed the button mod on the case so that I can use the capacitance function.In any case, I laughed at some of the "new here, what do I need" threads, because after going through ALL 155 pages and looking at quite a few threads, there is certainly enough info for those new to the field to figure out what piece of gear will suit their needs, especially basics.But, I'm not new to the field. Been in it since '86. Sadly though, where I work, has gone from component level to more/less easter egging.So I try to keep up the skills here and there on the side at home.Scopes are my favorite and just recently, got my 4th scope which is a Tek Type 422 with the ac/dc battery option. That will be handy in the garage for automotive work. Got it for a great price off ebay mainly for a spare, but I had to try to fix the time base issue, which resulted in having two operational 422's.In any case, great forum!

author: EEVblog
author_rank: Unknown
timestamp: April 15, 2014, 03:05:18 am
content: Everyone has a thermal camera.Don't ask what for, you just need one, ok.

author: pickle9000
author_rank: Super Contributor
timestamp: April 15, 2014, 03:11:02 am
content: Dave has a DSA (need a little work) maybe he would be willing to part with it.

author: xwarp
author_rank: Frequent Contributor
timestamp: April 15, 2014, 03:12:32 am
content: Quote from: EEVblog on April 15, 2014, 03:05:18 amIf I run across one for the right price.........GREAT videos you have by the way!

author: David Hess
author_rank: Super Contributor
timestamp: April 15, 2014, 10:45:58 am
content: Quote from: xwarp on April 15, 2014, 03:02:07 amI have done much the same thing. I kept buying duplicates figuring that I could combine them into one working unit but ended up repairing both without much trouble. I am way past 4 Tektronix oscilloscopes at this point.

author: Carrington
author_rank: Super Contributor
timestamp: April 15, 2014, 11:02:06 am
content: Quote from: EEVblog on April 15, 2014, 03:05:18 amEveryone has a thermal camera! Then where is mine?
Sanwa DMM CD-800a - Page 1
Forum section: electronics / testgear

author: han
author_rank: Frequent Contributor
timestamp: April 15, 2014, 07:05:32 am
content: I plan to buy Sanwa CD-800a, is there any review / teardown picture?http://overseas.sanwa-meter.co.jp/items/detail.php?id=29#
Help with Owon PC software - Page 1
Forum section: electronics / testgear

author: groston
author_rank: Newbie
timestamp: April 15, 2014, 03:53:38 am
content: All,Just received my Owon SDS8102 today. I am not an oscope expert, but this scope is vastly better than the Vellemen PCSU1000 that I had been using.Per the long conversation about the SDS7102:My scope has firmware version 2.8 - I assume this the the most up-to-date for this model?I checked the noise level and it seems to be less than 10 mVs - no complaintsTo the matter at hand:I captured a signal using a 1M storage depth. I am looking at a decaying signal with a RC constant of 5 us which occurs at the end of a 1 ms pulse. I would like to 'ship' the data for the entire waveform to my PC. I was able to install the software without any problems, and I was even able to get a bin file. However, this file only has 2980 values, thus the region of interest is completely lost.Could someone please point em to instructions for capturing the entire wave form?Thank you.

author: miguelvp
author_rank: Super Contributor
timestamp: April 15, 2014, 04:08:39 am
content: I don't have an Owon but it seems the Record Length Menu on Page 43 of the manual applies only to the external USB storage as in Page 49 of the manual.http://www.testequipmentdepot.com/owon/pdf/sds-series_manual.pdfEdited, couple of typos from not paying attention

author: groston
author_rank: Newbie
timestamp: April 15, 2014, 04:39:29 am
content: Miguel,Thank you - I had missed this entirely and will try saving directly to a thumb drive.
GBIP Interface - homebrew - Page 1
Forum section: electronics / testgear

author: m1kta
author_rank: Contributor
timestamp: April 14, 2014, 11:27:55 am
content: Hi....Anyone know of a homebrew GBIP interface (IEEE STD 488) to a PC?Got a nice 4 channel 400MHz Tekronix 2465 CTS scope, works fine stand alone but I know it can be used with a PC.Thought someone here might have. Seem to remember seeing someone using an AVR.72DomM1KTA

author: dave_k
author_rank: Frequent Contributor
timestamp: April 14, 2014, 12:15:09 pm
content: Look what 60 seconds of Googling found..http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCgQFjAA&url=http%3A%2F%2Fwww.eevblog.com%2Fforum%2Fprojects%2F%2420-gpib-project%2F&ei=_NBLU8PiMOSZiAfq84H4BQ&usg=AFQjCNHo7SSKszxW04fV0aR9f16qGxWphg&bvm=bv.64542518,d.aGc&cad=rja
Using a Spectrum Analyzer TG as Waveform Generator - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: April 10, 2014, 11:39:05 am
content: I was curious to know if others have used there TG in their Spectrum Analyzer as a waveform generator in a pinch. I have a Rigol DG4062 as my ARB FG, but occasionally have the need for a basic test frequency much higher than the DG4062 allows. It seems to work well, I can set my CF to what I need and Span to 0 then followed by the amplitude. Are there any drawbacks to this other than limited waveform production and maybe some stability?

author: KJDS
author_rank: Super Contributor
timestamp: April 10, 2014, 01:50:53 pm
content: The phase noise is usually a lot worse than a convention signal generator and there are often a lot more spurious signals too. Having said that, it's the approached used for the signal generators of some radio test sets.

author: KD0RC
author_rank: Regular Contributor
timestamp: April 13, 2014, 02:27:28 pm
content: I have been experimenting with my Rigol DSA 815 TG output, and it is not real clean. Here is a post I did no the topic:https://www.eevblog.com/forum/testgear/rigol-dsa-815-tracking-generator-distortion/msg393667/#msg393667For some things this signal will be very adequate. For others, probably not so much... I tried to get a Lissajous pattern using the waveform generator in my Agilent scope and the TG output from my DSA 815. There is so much phase noise on the TG sig that it was not real usable.
RAHAM General Microwave - Page 1
Forum section: electronics / testgear

author: jfphp
author_rank: Regular Contributor
timestamp: April 14, 2014, 07:28:48 am
content: I am looking for the operating and service manual of the General Microwave Radiation Hazard Monitor RAHAM) 481B + probe 83B (known as 6645M ?). Bought on a ham meeting last sunday : how can I calibrate the zero because the head is naturaly in an electromagnetic field and impossible to get the 0 in the lowest range ? Thanks.
Instek GOS-622G - Page 1
Forum section: electronics / testgear

author: Wildcat
author_rank: Newbie
timestamp: April 13, 2014, 02:33:17 pm
content: A seller locally has an Instek GOS-622G analog scope, new old stock for $150. I'm tempted to get it for an audio project I'm working on (long story, but I'm comparing the phase relationship between two signals), so I don't need anything too outrageous. What led me here was actually an old HP 1741A scope, but the local seller does not even know if it works. (And the last thing I need is another "fix up" project I may not even get around to, although I'd like to own a nice one like that, or a Tektronix, but it's not in the budget!)I saw mixed opinions on the Instek scopes here, so I am hesitant to pick this one up. But I've seen it and it is unused and works properly. I just need to get a set of probes for it. I had also looked at some of those USB scopes like the Hantek which I could use on the laptop, but reviews on those ran hot and cold and having never used one, I am not certain of how well it performs and what kind of trace resolution it has (IOW, I want a smooth looking trace...it seems the software is the limitation). That makes me wonder if the Instek might be a better bet. There is nothing else locally at the moment for the price, except for some ratty older scopes.Any opinions on this particular model? I did not have any luck searching here for it. Thanks!
Any ma/h or mw/h meters out there? - Page 1
Forum section: electronics / testgear

author: zapta
author_rank: Super Contributor
timestamp: April 13, 2014, 03:17:21 pm
content: I am looking for a meter that can integrate power or just current over time. This is to measure the power consumption of a bursty load that runs on a single 1500mah 1 cell li-ion battery for about one day. It can have a display or connect to a computer with matching software.

author: Melt-O-Tronic
author_rank: Frequent Contributor
timestamp: April 13, 2014, 05:56:56 pm
content: The PWRcheck from West Mountain Radiomightdo the trick for you.http://www.westmountainradio.com/product_info.php?products_id=pwrcheckPowerWerx also has a digital power meter that may work for you.http://www.powerwerx.com/digital-meters/dc-inline-watt-meter-power-analyzer-bare-wire.html

author: zapta
author_rank: Super Contributor
timestamp: April 13, 2014, 06:26:36 pm
content: Quote from: Melt-O-Tronic on April 13, 2014, 05:56:56 pmThanks Melt-O, I will take a look. Actually, I think I have the second one in my RC gear, it's this onehttp://www.astroflight.com/electronics/watt-meters/101.html,never used it for watt hour, just voltage current.Is there any test equipment quality product up there? Something that provides both accuracy and low voltage/current range?
Series/Parallel on Rigol DP800A - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: April 12, 2014, 01:24:49 pm
content: Does anyone know if you can without issue connect CH1/2 in series or parallel without incident on the Rigol DP800A? I have a Mastech 3 channel which has the Series/Parallel switch, but I have not used my Rigol DP800A this way. Sometimes I need the increased voltage and/or current and +/- voltages which the series/parallel helps with. I would guess this should not be a problem, just a few more cables since the DP800A does not have a physical switch to do the jumper internally. Unless I am missing something in the setup menu?
Re: PM3305 scope info - Page 1
Forum section: electronics / testgear

author: jancumps
author_rank: Unknown
timestamp: April 12, 2014, 08:40:16 am
content: reply to PMQuote from: Jonny on April 12, 2014, 05:56:13 amYou have to use the AC or DC triggering method for single shot. Auto triggering fires (automatically) even if the trigger event doesn't occur.I'll attach a scan of the digital triggering part of my manual.

author: jancumps
author_rank: Unknown
timestamp: April 12, 2014, 08:41:47 am
content: scans

author: Jonny
author_rank: Regular Contributor
timestamp: April 12, 2014, 10:07:38 am
content: That was very helpful and thankfully my scope is functioning as it should. Really appreciate your time to do this.
Agilent 6613C power supply transformer overvoltage output - Page 1
Forum section: electronics / testgear

author: pierre_lavoie
author_rank: Newbie
timestamp: April 11, 2014, 03:29:11 am
content: Hi guys, I bought a not working agilent power supply on ebay, an agilent 6613C, but a found something strange, the output of tap is 60v instead of 20, how it is possible, this is a single coil, no other tap on this coil and no insulation problem.I find this strange, an under voltage could be cause by some short circuit turn, but and overvoltage... strange.Pierre Lavoie

author: StR
author_rank: Newbie
timestamp: April 12, 2014, 08:45:23 am
content: Hi,isn't the HP6613Ca 50V/1A DC power supply? The6612Cis a 20V/2A DC power supply.StR
HP 3580a Spectrum Analyzer Option 002 - Page 1
Forum section: electronics / testgear

author: Shock
author_rank: Super Contributor
timestamp: April 11, 2014, 03:46:20 am
content: Was looking at this auction for the HP3580a Spectrum Analyzerwww.ebay.com/itm/331174493087When this option is installed there seems to be an extra switch to the right of the front input.UNBAL/BRDG/TERM.Does anyone know what functionality option 002 adds and how it works with the HP3580a?Is it better to get one with or without this option and can it be fitted or removed later? Especially interested from people who have one or used one.

author: edavid
author_rank: Super Contributor
timestamp: April 11, 2014, 10:37:14 pm
content: Option 002 adds transformer balanced in/out.(And BTW, that is WAY too much to pay for this.)

author: Shock
author_rank: Super Contributor
timestamp: April 11, 2014, 11:09:24 pm
content: I know a little bit about how a balanced signal works (differential signaling for noise cancelling).But would like to know more about the switch options.UNBAL - if this is selected does this add a ground and essentially bypass the option? The models without option 002 have the bottom input grounded.BRDG - bridged? How would this work?TERM - terminated? How would this work?I'm sort of asking does option 002 and the UNBAL/BRDG/TERM remove any functionally and what does it add from a practical sense?Edit:I got bored and RTFM. Looks like a small bit of extra capacitance on the Unbalanced input but otherwise it says it is operationally the same as models without option 002 (as far as I can tell) the schematic indicates the top connector is signal.
Agilent 6632B Error1,2,3,4,5,80 - After shorting FAN circuit.  - Page 1
Forum section: electronics / testgear

author: ielektros
author_rank: Unknown
timestamp: April 11, 2014, 11:13:05 pm
content: I have a problem with my second Agilent 6632B. I bought it yesterday with some of errors from my friend. He opened it because I did it too with my and modded a bit...He played with the FAN because the original was too loud for him. I dont know 100% how, but he closed the FAN + -.After restart just coming "Error" and "Prot" on a display.If I read all error out, I see: Error 1,2,3,4,5,80.I checked a bit and looks like Q300 TIP122 Darlington killed. Collector-Emitter was totally shorted... I havent TIP122 right now or some other Darlington (maybe yes but im lazy to search it) thats why I bought some online. But after I desoldered the TIP122 nothing changed with the errors. After strart the PSU without Q300 (TIP122), Error 1-2-3-4-5-11(???new???)-80 coming. The Error11 coming after I desoldered the TIP122. Before, it was no Error 11.Im affraid he killed the "A2 interf." board. I see all of error from 1 to 5 all about ROM checksum. Not nice..If somebody have an idea that will be really helpfull. Im no too up to date with these PSUs.Error codes:E1 Checksum in Read-only Non-volatile ROM A2 Interface BdE2 Checksum in Config Non-volatile ROM A2 Interface BdE3 Checksum in Cal Non-volatile ROM A2 Interface BdE4 Checksum in State Non-volatile ROM A2 Interface BdE5 Checksum in RST Non-volatile ROM A2 Interface BdE11 12 bit DAC test failed, 0 is written to DAC U241A and B, ADC U242 is checked for 133 +/- 7 counts A2 Interface BdE80 Dig I/O test failed, SEC_PCLR written low and high, read back through Xilinx A2 Interface BdMany thanks.

author: VK5RC
author_rank: Unknown
timestamp: April 12, 2014, 03:02:17 am
content: I am not sure if you have the manual, it is athttp://cp.literature.agilent.com/litweb/pdf/5957-6365.pdfI have been lead astray before by error messages being wrong, esp if voltages are incorrect.On page 4-8 of the manual is a trouble shooting flow chart which is usually helpful.I am not very good at these devices but I always go for "low hanging fruit" have you checked the voltage rails, fuses and electrolytics?

author: AndyC_772
author_rank: Super Contributor
timestamp: April 12, 2014, 06:27:24 am
content: Just in case it helps you define how much time and effort it's worth investing into the repair:http://www.ebay.co.uk/itm/2-off-AGILENT-HP-6632B-Bench-DC-Power-Supplies-/351046874812?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item51bc0636bc

author: StR
author_rank: Newbie
timestamp: April 12, 2014, 07:54:59 am
content: Hi,you should check the flat flex cable between the to pcbs. When not inserted properly the power supply reports all kinds of errors.One question:I also replaced the fan, but noticed quite a rise in temperature when the power supply had to dissipate about 95 watts ( 1V/5A over 100oC after 15 minutes ).I ended up with 3 fans to nearly reach the unmodified temperature when the power supply had to dissipate 95 watts ( unmodified 70oC now 80oC).But very quiet now.Did you check the temperature on the main components?StR
Lyrtech Nutaq Development Board... what's it for? SDR? - Page 1
Forum section: electronics / testgear

author: CaptnYellowShirt
author_rank: Frequent Contributor
timestamp: April 11, 2014, 10:46:35 pm
content: http://www.ebay.com/itm/221414054621Is this just an SDR board, or is there something special about it?
Looking for GW Instek PSP-405 service manual - Page 1
Forum section: electronics / testgear

author: naserturk
author_rank: Newbie
timestamp: April 11, 2014, 03:22:05 pm
content: Hello everyoneI have good will instek PSP-405 programmable power supplyand I need service manual of this power supplyI need winding diagrams of switching transformers too because some one before me made a modification on them and I think I have to rewind themcan you please help me?
Rigol DS6000-DK demo board being phased out? - Page 1
Forum section: electronics / testgear

author: miguelvp
author_rank: Super Contributor
timestamp: April 06, 2014, 05:07:15 am
content: I've been thinking to get this demo board for a while but didn't.Now, I can't find it anymore in the US, it's still available at rigol uk and rigo.pl but can't find it at rigol.com nor at rigolna.com, nor even at tequipment.net and I think they used to have it there.I guess it's being phased out?http://shop.meilhaus.de/en/rigol+ds6000-dk.htmhttp://rigol.com.pl/pl/p/DS6000-DK/75http://www.rigol-uk.co.uk/Rigol-DS6000-DK-Demo-Board-p/ds6000-dk.htm

author: notsob
author_rank: Frequent Contributor
timestamp: April 06, 2014, 05:45:36 am
content: Batronix have them in stockhttp://www.batronix.com/shop/accessory/test-equipment.html

author: miguelvp
author_rank: Super Contributor
timestamp: April 06, 2014, 06:15:52 am
content: Yeah, also in Europe although they do ship to the US and still a good price. But the extra $50 shipping kills itHopefully they do replace it with an alternative that is as cheap as this board was.I find it strange they went for a Cyclone III for this board when their Scopes use Spartan 6's, maybe because the MCU they refer to in the docs might just be a soft core NIOSII processor in the FPGA fabric.

author: tequipment
author_rank: Regular Contributor
timestamp: April 10, 2014, 02:47:24 am
content: Send me an email if you want one. I will see what I can do for you.ThanksEvanTEquipment.NETVice President

author: miguelvp
author_rank: Super Contributor
timestamp: April 10, 2014, 06:48:19 am
content: email sent.

author: tequipment
author_rank: Regular Contributor
timestamp: April 11, 2014, 02:43:39 am
content: They are 180. I am waiting on the lead time.Evan

author: miguelvp
author_rank: Super Contributor
timestamp: April 11, 2014, 03:53:33 am
content: Thanks Evan,Take your time, my wife is going to spend a small fortune on restoring her great great grandmother's table (it's a pretty old piece of furniture), so that will give me some leverage to get some gear for myself
fluke refurbs?? - Page 1
Forum section: electronics / testgear

author: deth502
author_rank: Frequent Contributor
timestamp: April 09, 2014, 08:04:47 pm
content: does fluke do factory refurbs? or does anyone here (located in the us) do, or know anyone who does fluke refurbs?i have a ts44pro linesmans set that i last had use for about 4-5 years ago. now we added a new building at work, and i will sooner or later be installing another voice network. i recall last i used it (again, 4-5 years ago) it had stopped working. i forget what the problem actually was, so it would need a full going over.i emailed fluke directly to ask them if they would perform this service, and an estimation of the price (to see if its even economically feasible to repair it, or just replace it with a cheaper low-end unit) but i never got anyhting back from them.

author: deth502
author_rank: Frequent Contributor
timestamp: April 10, 2014, 09:05:17 pm
content: no one???

author: retiredcaps
author_rank: Super Contributor
timestamp: April 10, 2014, 09:22:28 pm
content: Maybe this?http://us.flukecal.com/purchase/certified-used?geoip=1

author: deth502
author_rank: Frequent Contributor
timestamp: April 11, 2014, 01:25:02 am
content: thanks, ill try sending to the email listed there and see if i get a reply.
Agilent 2000x and 3000x - Do they use the same firmware? - Page 1
Forum section: electronics / testgear

author: jstarr
author_rank: Regular Contributor
timestamp: April 10, 2014, 03:45:53 am
content: Is firmware v 2.35 same for both 2000x and 3000x? Can I revert a MSOX3034A from v 2.36 to 2.35 using v2.35 from a MSOX2024A?\thanksjohn

author: eurofox
author_rank: Unknown
timestamp: April 10, 2014, 08:16:52 am
content: I think you can downgrade to 2.35, 2.36 is not available on Agilent support website.Current Firmware/SoftwareVersion: 2.35Release Date: 2013-06-24eurofox

author: iRad
author_rank: Regular Contributor
timestamp: April 10, 2014, 06:02:49 pm
content: Quote from: jstarr on April 10, 2014, 03:45:53 amThey are different for each class instrument. Who knows how much different, but why even worry about it. Just download the 3000X v2.35 from the Agilent web site. You should save a copy of it just in case they make unfriendly changes in future versions...Find it here:http://www.home.agilent.com/agilent/techSupport.jspx?cc=US&lc=eng&nid=-33573.970761.08&pid=1947865&pageMode=OV

author: Lajon
author_rank: Contributor
timestamp: April 10, 2014, 07:37:47 pm
content: They are different downloads but actually identical except for the file name:$ md5sum *.cab86775c911a0b67403626e5f95cd0d4d3 *2000XSeries.02.35.2013061800.cab86775c911a0b67403626e5f95cd0d4d3 *3000XSeries.02.35.2013061800.cab/Lars

author: jstarr
author_rank: Regular Contributor
timestamp: April 10, 2014, 08:09:09 pm
content: Quote from: Lajon on April 10, 2014, 07:37:47 pmThanks Lars. Does that mean I could use the same files on my USB stick that unlocked my MSOX2024A options to unlock the options on a MSOX-3034A without any further changes?john
Elektrobit PropSim C2 radio channel emulator - Page 1
Forum section: electronics / testgear

author: Palmsquirrell
author_rank: Contributor
timestamp: April 10, 2014, 06:44:59 pm
content: The Elektrobit PropSim C2 is a wideband radio channel emulator.I am looking for a user manual/operator's manual.I did try Elektrobit but they no longer carry the PropSim line and the company who purchased the line (Anite) do not have any info on the C2.Would greatly help me if I can get links to a User Manual or a hardcopy of the Manual, and any other resources like firmware updates.Thanks
Tektronix 475 Beam Irregularity  - Page 1
Forum section: electronics / testgear

author: UnEntitled
author_rank: Newbie
timestamp: April 09, 2014, 01:19:05 am
content: The dot is off by a bit. It doesn't form a perfect circle when I focus it right. Instead it forms a short line-ish mark. I'll see if I can get some pictures.I have some ideas but does anyone have suggestions to remedy this?Here is a picture for further clarification.

author: c4757p
author_rank: Super Contributor
timestamp: April 09, 2014, 01:32:11 am
content: Yes, look for the astigmatism control and adjust it.

author: poida_pie
author_rank: Regular Contributor
timestamp: April 09, 2014, 03:00:49 am
content: yes, the astigmatism control will help. In most cases you will not be able to get a perfect circle.Also, the astigmatism control has different degrees of effect depending on the time the CRO is powered up.I set the astigmatism control only after my CRO has warmed up for about 1/2 and hour or so.

author: calexanian
author_rank: Super Contributor
timestamp: April 09, 2014, 05:27:55 am
content: Also the focus looks a little out and the intensity looks a little high. Some era tek's had sharper traces than others. My TAS220 has a terrible (In my opinion) Trace. It works fine, but my previous Hitachi and Goldstar had far better traces. By the time I bring the brightness up its all bloomed!

author: PaulAm
author_rank: Frequent Contributor
timestamp: April 09, 2014, 02:34:25 pm
content: You should get a sharp dot only when the intensity is just high enough to see the beam on the screen. Adjust focus and astigmatism controls as needed, their settings vary based on the intensity. The 465/475 CRTs have an expansion mesh so the trace is not as sharp as some CRTs, particularly if you turn up the intensity.Make sure your input AC/Gnd/DC switches are in the Gnd position, you might be seeing some noise. And of course, don't leave the beam turned up or you'll burn the screen.

author: David Hess
author_rank: Super Contributor
timestamp: April 09, 2014, 11:11:39 pm
content: Astigmatism is what I would check first as well but after doing the z-axis calibration procedure in the service manual if that is not the problem, then I would check the supply voltages for ripple.
BK 1653 Isolated variac, when NOT to use? - Page 1
Forum section: electronics / testgear

author: county
author_rank: Newbie
timestamp: April 09, 2014, 09:15:55 pm
content: I have a BK 1653 isolated autotransformer, as well as a standard non-isolated autotransformer.I use these devices for repairs of analog electronics on a daily basis, but I usually the non isolated variac.Is there ever a situation when I WOULDN'T want to isolate the DUT?I know WHEN to use an isolated supply, but I'm not sure when I DON'T want to use an isolated supply.Any thoughts?

author: AG6QR
author_rank: Frequent Contributor
timestamp: April 09, 2014, 11:18:32 pm
content: You don't want to use an isolated supply if you want the safety of having a working ground fault interrupter (known as RCD in some parts of the world, GFCI in others).If there is a single fault between some part of the DUT and an earth ground, with a GFCI, power will be cut. With an isolation transformer (whether or not a GFCI is feeding the isolation transformer), power will not be cut. Such single fault won't immediately result in a person receiving a shock, but it means there is a possibility that a person could be shocked if he touches ground while touching a portion of the DUT that is at a different potential than the grounded point of the DUT.There are times when isolation can be a good, or at least not bad, thing. But not always. If isolation were always a great thing, our electrical codes would require isolation of all household wiring. Codes wouldn't require that the neutral be bonded to ground at the service entrance. Usually, I'd rather stick with the electrical codes and have the safety of neutral bonded to ground, combined with a good GFCI.But when you need to do something unusual like use a ground-referenced scope to probe a device in an unusual way it can be reasonable to use an isolation transformer, with caution.
Checking a battery with the DE-5000 LCR Meter. - Page 1
Forum section: electronics / testgear

author: Carrington
author_rank: Super Contributor
timestamp: April 08, 2014, 11:24:10 am
content: I found this (perhaps not the best way, but it works.):http://blogs.yahoo.co.jp/tek2465/7968952.htmlhttp://blogs.yahoo.co.jp/tek2465/7968954.htmlhttp://blogs.yahoo.co.jp/tek2465/8112100.htmlhttp://www.home.agilent.com/agilent/editorial.jspx?cc=ES&lc=eng&ckey=2045153&nid=-536902441.0.00&id=2045153

author: KedasProbe
author_rank: Frequent Contributor
timestamp: April 09, 2014, 08:47:44 am
content: I think depending on how well the input of the LCR is protected you have to be careful with higher DC voltages on caps in series. There is only no DC on the LCR input if the cap is loaded, not in the short time before.You could obviously load the caps (correctly) before connecting if you have a high voltage like an 24V battery.
Need help identifying FG jacks on the Wavtek 188-S-1257 - Page 1
Forum section: electronics / testgear

author: chipwitch
author_rank: Frequent Contributor
timestamp: April 08, 2014, 10:38:06 pm
content: Well, I know they're banana jacks. What I don't know is what they're for.I just received my very first function generator and made some test cables for it. I found a manual online for the Wavtek 188, but mine is a 188-S-1257. They look almost identical except for the 3 banana jacks on the lower right of the panel. What are they called? For? The model 188 shows a BNC jack where the banana jacks are on mine, marked "LO".

author: Fank1
author_rank: Regular Contributor
timestamp: April 08, 2014, 10:51:12 pm
content: They are the 600 ohm output connection.The two top ones are balanced out "not grounded". The bottom one is grounded, hook your 2 pair shielded cable shield here.

author: chipwitch
author_rank: Frequent Contributor
timestamp: April 09, 2014, 02:43:42 am
content: Before today, I've never even seen a function generator in use. So, I don't know what any of that means. I mean, I know what itmeans, I'm just not sure of the implications. The manual for the 188 is helpful, but still lacking.Thanks<edited> Deleted several questions to be asked in a new thread
My new toy HP3458A - Page 1
Forum section: electronics / testgear

author: VR2XGI
author_rank: Newbie
timestamp: April 10, 2014, 02:14:41 pm
content: I bought a HP3458A from a Chinese forum 38hot friend.anyone have hp3458A service manu? I want to cal the meter.73 de VR2XGI

author: c4757p
author_rank: Super Contributor
timestamp: April 10, 2014, 02:25:38 pm
content: It's all here, dude.But... good luck.

author: jlmoon
author_rank: Unknown
timestamp: April 10, 2014, 02:36:37 pm
content: I might be a newber on here.. but have to say.. Calibrating a 3458a to the degree of it's intended use is not a task for the 'faint of heart' ..

author: VR2XGI
author_rank: Newbie
timestamp: April 10, 2014, 02:47:07 pm
content: Quote from: c4757p on April 10, 2014, 02:25:38 pmThanks so much!!!73deVR2XGI
auto power off timeout - Page 1
Forum section: electronics / testgear

author: npelov
author_rank: Frequent Contributor
timestamp: April 08, 2014, 09:44:49 pm
content: I have few battery powered devices with automatic power off and few without. I lost quite a few batteries by forgetting the device powered on, but I also have troubles with devices that have automatic power off. For example MS 8220R multimeter times out after 10 minutes. That's too soon in my opinion. I think for a multimeter that does not take into account significant change in reading for it's auto-power off the minium is 20 minutes.I have the same problem with backlight. Even my top of the line Brymen BM-869 multimeter has bad value for backlight timeout - about 15 seconds. If it had dedicated button for backlight it would be less annoying but every time I need to measure in the dark I have to press and hold "select" button and it is barely enough for one measurement. Sometimes you would sacrifice a battery for 1-2 hours work in the dark (or in my case I would have to charge the battery again).So I thought I ask everyone:What is your best value forauto-power-offandbacklight timeoutfunctions of battery powered devices? Or if you could choose between 4 programmable values what would they be?I know it depends on device functionality, but still if you had a chip that implements that functionality what would be the best timeout value(s) for it?
Agilent / HP CDMA base station E6380A ; replacing memory batteries. - Page 1
Forum section: electronics / testgear

author: Palmsquirrell
author_rank: Contributor
timestamp: April 08, 2014, 11:51:45 am
content: Agilent/HP CDMA Base station E6380AI get the following : "AA memory backup batteries are low"I do not have a owner's manual, but I did look at an online manual but have not found the instructions on how to replace the batteries.Thanks

author: Towger
author_rank: Super Contributor
timestamp: April 08, 2014, 12:12:02 pm
content: You need to improve your google skills.From page 31 of the manual:http://www.home.agilent.com/upload/cmc_upload/All/6C06UGE6380-90016.pdfDo not use rechargeable batteries.To change the AA batteries, use the following procedure:1. Turn off power and unplug the Test Set.2. Remove the six screws in the rear panel using a TX-15 TORX (R)screwdriver.3. Remove the rear cover.4. Replace the AA batteries.5. Replace and reconnect the rear panel. Dispose of used batteriesproperly.

author: Palmsquirrell
author_rank: Contributor
timestamp: April 08, 2014, 04:20:19 pm
content: I looked at that same manual and saw batteries mentioned in the Index as being on page 31. So I went to page 31 on the pdf instead of page 31 on the actual manual.I normally check the page number printed on the paper as it does not correspond to the page # on the PDF but this time I forgot all about it.Thanks.
High Voltage between Connector and Chassis - Page 1
Forum section: electronics / testgear

author: sled
author_rank: Contributor
timestamp: April 10, 2014, 11:55:26 pm
content: Hi,I recently bought a Wavetek HF142 Function Gen from the 70s, at first glance it works fine but when I measured the voltage between the BNC ground and the Chassis of the function generator I was a bit shocked, since it's ~90VAC! The signal amplitude referenced to BNC ground was only a few mV thoughSo is this "normal"?I took the function generator apart and it has a power board with a transformer in it, I couldn't find any connection to mains either on the actual function gen PCB.PS: The Frequency Range Knob also seems to be off by one, if I select 10k it's actually 1k, and if set to 100k it's 10k etc. maybe someone encountered this problem too ^^

author: David_AVD
author_rank: Super Contributor
timestamp: April 11, 2014, 12:37:28 am
content: Quote from: sled on April 10, 2014, 11:55:26 pmIf it's acollectcollet knob, loosen it, move it to the correct position and tighten. If it's a spline type you should be able to remove and place back a few teeth to the left/right as required.

author: sled
author_rank: Contributor
timestamp: April 11, 2014, 01:04:45 am
content: Thanks for the hint! I'm not quite sure which type it is really - I've made a picture (it's the one in the red circle):

author: David_AVD
author_rank: Super Contributor
timestamp: April 11, 2014, 03:43:28 am
content: The switch doesn't really have much bearing on the knob type. Collet knobs have a little cap that pops off to reveal a nut that tightens the knob onto the switch shaft. Or it could be a screw-fix know with a small grub screw on the side.I notice a mains switch section down the back. Does the range switch also turn the power on/off ? If so, does the knob marker line up with the off function correctly?
Buying a Used MSOX 3000' series - Any changes to Motherboard? - Page 1
Forum section: electronics / testgear

author: jstarr
author_rank: Regular Contributor
timestamp: April 07, 2014, 07:38:05 pm
content: Hello,I would like to buy a used MSOX 3000 series either 200 or 350 Mhz. I have a few to pick from but they are all made in 2010 or 2011. Does anyone know if there have been any important motherboard design/manufacturing issues that I should watch out for... maybe not buying a scope older than 1-2 years old??thanksjohn

author: iRad
author_rank: Regular Contributor
timestamp: April 08, 2014, 03:12:53 am
content: This would probably be a good question to ask Agilent Tech Support. If residing in the US, the Agilent Toll Free Phone Number is: 800 829-4444, with hours 8:00 am - 8:00 pm ET, Mon - Fri.

author: iRad
author_rank: Regular Contributor
timestamp: April 08, 2014, 03:19:09 am
content: And don't forget that the DSOX3100 can now be hacked all the way to a MSOX3200, and the DSOX3350 up to a MSOX3500. Of course there is no easy way to hack the logic probes, but they have been selling for about $300 US a set on eBay.
5 Years in undergraduate school - Page 1
Forum section: electronics / testgear

author: opa627bm
author_rank: Regular Contributor
timestamp: April 06, 2014, 05:50:18 am
content: 5 years ago, I was proud of having a Fluke 117 and now this is what I own.... God bless America

author: TMM
author_rank: Frequent Contributor
timestamp: April 06, 2014, 06:11:38 am
content: Needs more multimeters.

author: opa627bm
author_rank: Regular Contributor
timestamp: April 06, 2014, 06:35:10 am
content: Quote from: TMM on April 06, 2014, 06:11:38 amI want to sell the Keithely but it was given as a gift lolThe 34401 and 34410 have sentimental value and the nano volt meter is very useful too

author: Stuey
author_rank: Contributor
timestamp: April 07, 2014, 12:37:11 pm
content: I like your markers/tweezers holder! What is the strip material, rubber?

author: made2hack
author_rank: Frequent Contributor
timestamp: April 07, 2014, 03:56:39 pm
content: Needs more cowbell!!!
How ESD meters works and why they costs so much? - Page 1
Forum section: electronics / testgear

author: mimmus78
author_rank: Unknown
timestamp: April 07, 2014, 08:57:18 am
content: I tried to found some documentation on this small esd field meters but with no luck. Anyone know how it works? Why they costs so much?

author: mcinque
author_rank: Unknown
timestamp: April 07, 2014, 11:26:01 am
content: AFAIK, they basically inject a low voltage (like 1Vpp) sine or squarewave test frequency (1, 10, 100KHz) in the component and read the mV dropdown voltage conseguent to his resistance to obtain an ESR value.The more the frequency rises, the less is the reactance, so the standard test frequency is 100Khz.At high frequencies like 100KHz is more difficoult to read the milliVolts dropdown (many cheap DMM give up just at 10KHz!), I think is this that makes expensive this instruments.You can build one on your own or use some alternative methods like thisHope it helps.

author: BravoV
author_rank: Super Contributor
timestamp: April 07, 2014, 11:29:20 am
content: ESD != ESR

author: mcinque
author_rank: Unknown
timestamp: April 07, 2014, 11:48:59 am
content: R and D are close on the keyboard...I should learn to read better.To reply to the thread, I guess they cost much because they should read a wide range of voltages with low currents and therefore they should be much sensitive.

author: mimmus78
author_rank: Unknown
timestamp: April 07, 2014, 12:26:38 pm
content: Maybe I found something from another Italian:http://www.instructables.com/id/Adruino-Based-Electrostatic-Field-Mill/?ALLSTEPS
Does anyone have a TTi EX752M bench power supply? - Page 1
Forum section: electronics / testgear

author: FF_CCSa1F
author_rank: Newbie
timestamp: March 24, 2014, 10:45:33 am
content: Hello, EEVblog forums. I'm sorry to try and leech off of this place with a first post like this.I got my hands on one of these units for free, broken, but it has sadly been tampered with by a rather inexperienced tech, who did a lot of work on it, but didn't save the components he replaced. I can't trust him to have installed the correct replacements, making troubleshooting it very tedious. If anyone has one of these units, or even one of its smaller siblings, I'd be eternally grateful to find out what IC1 and IC7 on the power board are supposed to be. I'm attaching two pictures of the unit, including one of the two possibly incorrectly replaced chips.If anybody has any general tips for repairing a unit like this, I'd love to hear them. The only thing that's working in it is the active PFC controller (an ST L4981A), but there seems to be a small switchmode converter built around the two logic chips (a 4013 and a 4069 - but they could be wrong), which is not starting. The entire primary side of this power supply is a bit of a convoluted mess of bits and bobs and thin traces going all over, making it a nightmare to work on. I've checked all the usual suspects (capacitors (including ESR), power devices, low value resistors, diodes, etc.) a hundred times over, to no avail, and I'm starting to grow desperate. It would be such a shame to trash a nice unit like this.

author: seronday
author_rank: Regular Contributor
timestamp: March 26, 2014, 01:13:41 am
content: Have you tried Emailing TTi to obtain a copy of the Service Manual and Circuit.

author: FF_CCSa1F
author_rank: Newbie
timestamp: April 07, 2014, 06:12:20 am
content: Yes, and they supplied me with one - free of charge! The sad part is that the ICs are (off-brand) variants of the correct circuits, but I'm gonna try to replace them with proper ST components, once they arrive.EDIT: After a lot of troubleshooting, I found out that the issue wasA) A broken trace to IC1 causing it to output <5 V gate voltage to the primary side switching transistorsB) A shorted output transistor on channel A, causing the voltage across the 470 µF/100 V cap on channel B to spike high enough for the OVP to kick inC) An open resistor (R38) on channel A causing the voltage across Q12 to be very high, and essentially cause the regulator to never turn on, and hit the OVP due to underloadI hope this can help anyone else with one of these units. TTi were very helpful in supplying the schematic and service manual. Sadly, they're plastered with "DO NOT REDISTRIBUTE", so I wouldn't feel good posting them here.
Oscilloscopes and measurement categories - Page 1
Forum section: electronics / testgear

author: fubar.gr
author_rank: Unknown
timestamp: April 07, 2014, 12:52:58 pm
content: My cheap Rigol is rated 300V CAT I.The standard probe that comes with that scope is rated 300V - CAT II with the switch set at 10xSome active 1000x probes have even higher ratings, eg 600V - CAT III.Does that mean that using such a probe I can safely perform a CAT II or III measurement, even if the scope itself is rated for CAT I?

author: Lightages
author_rank: Unknown
timestamp: April 07, 2014, 03:07:30 pm
content: The short answer is no. The long answer is that the probe has a switch which allows the probe to be switched to the lower safety and thus could cause you to make a mistake and blow something. This is according to the current CAT rating rules.But.....IMHO I would see no problem using the probe and scope combination on the higher CAT rating but I might put some tape one the switch to make it harder to move by accident.
Disparity Reading Capacity Value With Metalized Film Caps? - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: April 06, 2014, 08:08:53 pm
content: I have a trusty Sencore LC-53 that's right on the nose as well as the simpler ones inside of my Metex/Tenma Workstation and multimeters. Last evening I was sorting through some new caps that I bought and generally will give a few a check to see how close in tolerance they are especially with bargain grab bag type assortments. Ceramics, silver micas and polystyrene caps checked pretty close to their rated value on both instruments. Yet the metalized film ones read way differently. For a .1mf cap, the metex station and handheld meters read very closely at near .2mf where the LC-53 read close to .4uf. I noticed this disparity again with other mf caps. Anybody got an idea why? I'm going to dig out my old rcl bridge and see what I get with that.