hybridfree/eevblog-posts huggingface dataset:
Recognize this multimeter? - Page 1
Forum section: electronics / testgear

author: masster
author_rank: Regular Contributor
timestamp: January 29, 2015, 06:31:55 pm
content: HiDoes anyone recognize the brand and type of this DMM?

author: Yago
author_rank: Frequent Contributor
timestamp: January 29, 2015, 06:40:33 pm
content: Looks a bit like a Hioki.

author: CosPhi
author_rank: Regular Contributor
timestamp: January 29, 2015, 06:45:57 pm
content: Not Hioki, it's a Sanwa. It is even on the eevBlog Multimeter Spreadsheethttps://www.eevblog.com/forum/testgear/multimeter-spreadsheet/

author: retiredcaps
author_rank: Super Contributor
timestamp: January 29, 2015, 07:46:16 pm
content: It looks like a Sanwa PC510 or PC510a.http://jimmyauw.com/wp-content/uploads/2010/01/sanwa-22ohm.jpg

author: Handyman32
author_rank: Newbie
timestamp: January 30, 2015, 05:10:22 am
content: This is a Sanwa PC510a (Taiwan) or PC510 (Japan).It is a midrange DMM. Very good and very accurate with 5000 counts and true RMS. It will retain its accuracy after many years.It is not cheap though, may be around USD 200.00.It has an old school design and does not have a backlight. For electronics use it is superb.

author: masster
author_rank: Regular Contributor
timestamp: January 30, 2015, 06:38:47 am
content: Thank you very much for identification and review.

author: avvidclif
author_rank: Regular Contributor
timestamp: January 30, 2015, 02:07:49 pm
content: Actually I would call it a cheap chinese clone of a very good multimeter. Quality would be in question.

author: Wytnucls
author_rank: Super Contributor
timestamp: January 30, 2015, 02:21:25 pm
content: Probably made by Brymen. It is fitted with a Brymen proprietary DMM chip (BTC197).

author: nanofrog
author_rank: Super Contributor
timestamp: January 30, 2015, 04:05:22 pm
content: Quote from: Wytnucls on January 30, 2015, 02:21:25 pmSeems genuine Sanwa is still made in Japan.

author: Handyman32
author_rank: Newbie
timestamp: January 30, 2015, 05:31:41 pm
content: As we can note GP is a Chinese cell. This multimeter is most probably made in Taiwan. Sanwa are generally good quality meters. But their dull design and weird ergonomics can be a turn-off.The closest Fluke equivalent to this meter is the 87V which carries a much higher price tag, but is also much more pleasurable to use.
R&S FSH-Z2 VSWR bridge strange frequency response? - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: January 31, 2015, 09:12:31 am
content: Hello,I have 2 R&S return loss bridges type numbers FSH-Z2 and a ZRB-2.The directivity of the FSH-Z2 bridge has a strange frequency response comparerd to the ZBR-2.Both bridges are terminated with a R&S Z-30 reference load.The attached photo speak for themselves.Is there optionally a solution or is this normal voor this type of bridge? (FSH-Z2)Regards,Marcel

author: Unknown
author_rank: Unknown
timestamp: January 31, 2015, 09:16:05 am
content: The photo of my previous posting is a screenshot of the FSH-Z2 and this is a photo of a screenshot from the RS ZRB-2 bridge.

author: KJDS
author_rank: Super Contributor
timestamp: January 31, 2015, 10:04:27 am
content: The spec of the FSH-Z2 is typ 30dB from 20MHz to 3GHz, therefore it's what I'd expect.
Tektronix 2225/2225ST - Page 1
Forum section: electronics / testgear

author: phetus
author_rank: Newbie
timestamp: January 29, 2015, 01:26:14 pm
content: Got a crusty looking Tektronix 2225ST, thinking it was a normal 2225 yesterday. Doh! Don't use ebay when you're half asleep!Is there any difference between the 2225 and the 2225ST other than that the ST has a storage function? And is 80€ too much?Couldn't find much info online anywhere. Here's the ebay link:http://www.ebay.com/itm/Tektronix-2225-Oszilloskop-2-Kanal-50MHz-/191493220350?nma=true&si=Nw0Em0UX5u9woyjRy%252FA%252BhiXz%252Fsg%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557Thanks in advance!
Siglent SDG810 vs. SDG1010 - Page 1
Forum section: electronics / testgear

author: Phaedrus
author_rank: Frequent Contributor
timestamp: January 27, 2015, 11:01:56 pm
content: Wondering what practical difference there is between these two function generators. Their key specs seem to be identical, front panel is identical aside from coloring, etc. But the SDG810 is $50 cheaper. Is there any difference I'm missing?http://www.tequipment.net/Siglent/SDG1010/Function-Generator/http://www.tequipment.net/Siglent/SDG810/Function-Generator/

author: tautech
author_rank: Super Contributor
timestamp: January 27, 2015, 11:15:45 pm
content: You'll need to study the datasheets to spot them all.800 series have only 1 output channel.Risetime is not as fast.P-P output not as highetc, etcMost of the info you seek will be linked from this thread:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/

author: rf-loop
author_rank: Super Contributor
timestamp: January 29, 2015, 05:48:35 am
content: Quote from: tautech on January 27, 2015, 11:15:45 pmI think this is mistake.In some data sheet there is missing output levels when load is Hi-Z.Maximum levels are same as in SDG1000 series main channel CH1.Up to 10MHzHi-Z load 20Vpp(max +10V and -10V including offset)50 ohm load 10Vpp(max +5V and -5V including offset)Sidenote: Using Arb function there can produce example Square, Pulse, or Sinewave.If there do example over 10MHz Square, pulse, sine (or what ever) it do not automatically limit output level settings because Arb max setting is 5MHz. But this, of course, do not mean that Arb output limited to 5MHz, not even in SDG805. Just have tested 20MHz Arb sine and Arb square out from SDG805.

author: tautech
author_rank: Super Contributor
timestamp: January 29, 2015, 06:05:37 am
content: Quote from: rf-loop on January 29, 2015, 05:48:35 amConfirmed.I did not have an 800 series to test and got the imformation from the datasheet V1.1 and yes it lists only for 50 Ohm 10Vpp.

author: rf-loop
author_rank: Super Contributor
timestamp: January 29, 2015, 06:48:11 am
content: Quote from: tautech on January 29, 2015, 06:05:37 amYes, they need correct this data sheet!order to avoid confusion. Also I know it sure only after my own check with SDG800 in my hand. (and overall, Siglent also need develop data sheets better and more complete and perfect for all products. HP and Tek old and new data sheets are good study material how these need do)It looks like there is also other and more serious mistake in data sheet. (but this later after double check that I have not done any mistake) This level mistake do not tell wrong information, but this other (not yet fully confirmed) give really wrong information what is always more severe (= "missing data is always better than wrong data")Edit ADD:In SDG800 data sheet read Pulse mode minimum pulse width is 16nsI have tested ONLY with SDG805. In this model minimum Pulse width is 48ns.
How long does it take Rigol to respond to a firmware request? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: January 29, 2015, 01:12:18 am
content: Any idea on the typical time for Rigol to send out the firmware link? Is it generic for the DS1004z series?

author: aargee
author_rank: Frequent Contributor
timestamp: January 29, 2015, 01:41:35 am
content: Well, I made a query through their online support and I had Rigol Europeanda Rigol engineer from China ask what I needed and sent through the firmware for my 1054z. All within 48Hrs.

author: nanofrog
author_rank: Super Contributor
timestamp: January 29, 2015, 02:21:20 am
content: Quote from: BlueBill on January 29, 2015, 01:12:18 amRigol has already posted this before, but here's the00.04.02.SP4 firmwarefor the DS/MS1000Z series for your convenience.But to answer your question, day or two here in the US/CAN via the request form.

author: BlueBill
author_rank: Regular Contributor
timestamp: January 29, 2015, 03:28:01 am
content: Perfect, thanks for the link. Seems Rigol responded very quickly but I missed it because I was looking at the wrong email account.

author: CParish
author_rank: Newbie
timestamp: January 29, 2015, 04:03:36 am
content: I've requested firmware twice over the last month for my DS2000 without a reply, and I know I'm getting their e-mails because of the automated confirmation. I guess I'll try their technical support e-mail next. The strange thing is, when I've requested firmware in the past, they usually respond within a day or two. It's actually rather annoying to have firmware behind a wall like that.Does anybody reading have thelatestDS2000 firmware download link?

author: miguelvp
author_rank: Super Contributor
timestamp: January 29, 2015, 04:08:09 am
content: Latest firmware that I know of, for the DS1000 and the DS2000 in the jitter thread posted by Rigol after they fixed the jitter here:https://www.eevblog.com/forum/blog/eevblog-683-rigol-ds1000z-ds2000-oscilloscope-jitter-problems/msg578208/#msg578208It was released Dec 31st 2014:

author: CParish
author_rank: Newbie
timestamp: January 29, 2015, 04:19:21 am
content: Quote from: miguelvp on January 29, 2015, 04:08:09 amI found the thread with all the archived versions up to 03.01, but I missed this. Thanks!
Serial protocols like I2C/SPI decoders for Tek TDS7000 series? - Page 1
Forum section: electronics / testgear

author: TiN
author_rank: Super Contributor
timestamp: January 28, 2015, 04:30:55 pm
content: Is it just me , or there is no Tek software or options to decode I2C/SPI buses on old hiend scopes like TDS7000 series?I know, using 4GHz scope for 100kHz I2C is kinda over the top, but sometimes there is no other scope or LA near by to use.Google finds me only 3rd partyPGY-I2Cdecoder. I wonder if there are other options possible?

author: nctnico
author_rank: Super Contributor
timestamp: January 28, 2015, 09:45:06 pm
content: Maybe there is a similar API compared to the TLA700 series logic analyser?
Fluke test leads - Page 1
Forum section: electronics / testgear

author: MikeyBC
author_rank: Newbie
timestamp: January 28, 2015, 01:21:25 am
content: Hi, First post here, forgive me if this subject has come up before. I have a Fluke 73-II that has served me well since around '92 and have the TL-71 leads on it and they fit nice and snug with no wobble at all. I have recently purchased a used near mint Fluke 87-V, However when I put the TL-71 leads into the 87-V they wobble a bit...I'm concerned that something may break in the meter. The stock leads that came with the 87-V look like the TL-75 and fit snug with no wobble at all. I also noticed the center pin in the lead under the plastic sleeve (meter end) is a bit longer on the TL-71 vs the TL-75. Anyone else notice a little wobble with their TL-71 leads on a 87-V ?

author: ModemHead
author_rank: Frequent Contributor
timestamp: January 28, 2015, 03:43:44 am
content: Welcome to EEVblog forums.Yes the TL-71 wobble a bit more than TL-75s on my 80-series meters, but not so on the older 70-series. Primary reason is that the jack inside diameter is over 1mm larger on the 80s, so the shroud does not fit snugly at all. Also, the TL-75 plug has a 4mm solid post that is split to make it springy, whereas the TL-71 plug uses a lantern-style spring on a thinner post.The TL-71 plug shrouds have a small band up near the strain relief that is a bit wider than the rest of the shroud. If you trim about 2mm off of the shrouds, they will sink farther into the jacks. This band will then fit into the jack perfectly, which will make the whole affair quite snug.

author: MikeyBC
author_rank: Newbie
timestamp: January 28, 2015, 04:27:26 am
content: Thank you very much for that information, I really appreciate it,Edit: I did the mod, much better now, thanks.
fluke 10 faded digits - Page 1
Forum section: electronics / testgear

author: rickselectricalprojects
author_rank: Regular Contributor
timestamp: January 30, 2015, 11:50:48 am
content: hi everyone!i know that this is yet another fluke faded display post BUT this is not an 87v. i scored a fluke 10 and 11 multimeter from eBay for $40 and they both work great how ever they are known for having display issues. they dont make the fluke 10 anymore so there are no lcd replacement kits for sale. so my question is is there a simple way to fix this without getting a new screen? also the fluke 11 is very tattered while the fluke 10 was used it still had the plastic wrap on the screen so it wouldn't of had much use.(PS don't be to harsh because i am only 14 and i dont know everything and sorry for the crappy picture)thanks!!!

author: GreyWoolfe
author_rank: Unknown
timestamp: January 30, 2015, 12:38:06 pm
content: You can try to 'reflow' the flat flex cable if it is soldered to the display. If the meter uses zebra strips, you can remove the display and clean the contact points with isopropyl alcohol . Not knowing the meter construction, i am only guessing here. Hopefully someone with knowledge of the meter will chime up. Last year I bought a TI-82 calculator at a hamfest with vertical blank lines and I used a common heat gun to heat up the strip attached to the display and applied pressure until the cable/display cooled off. That eliminated the blank vertical lines. Good luck with the project.

author: Excavatoree
author_rank: Frequent Contributor
timestamp: January 30, 2015, 01:01:54 pm
content: The Flukes of this type use the zebra strip, like the 87. For generally faded segments, cleaning the strips, and the PCB contacts will usually solve the problem. Be very careful - the bonded conductive pads on the glass are VERY fragile. I'd say if the zebra strip is stuck to the LCD, don't separate them. Also, don't attempt to clean the LCD contacts.The common display problem with these is black blobs. They start small, and get larger. Sometimes the small blobs don't get larger very fast, sometimes they do.

author: retiredcaps
author_rank: Super Contributor
timestamp: January 30, 2015, 11:37:59 pm
content: Excavatoree forgot to mention that you can modify the 10 and 11 into a 12. See (near the bottom)https://www.eevblog.com/forum/chat/fluke-25-my-first-digital-multimeter/
Keysight 3000T: new trigger capability question - Page 1
Forum section: electronics / testgear

author: peter-ger
author_rank: Newbie
timestamp: January 23, 2015, 07:18:47 am
content: Hello guys,I'm wondering how the "must intersect" Trigger works.In the manual I found a comparison of needed steps: on the one side "draw box and select intersect" and on the other side (traditional scopes) "Determine what trigger makes the most sense for the signal you are trying to isolate. In this case, we’ll try a rise-time trigger irst....". That would mean, using "must intersect" do not need to use regular trigger.Thats confusing.Well, actually there is no particular section on the signal which can be triggered on if the waveform is not stable viewable (=not triggered).Even if i press the stop button, untriggered signal is untriggered signal. The waveform is then just captured randomly.How could the scope trigger only on a specific region of a signal? Which region? After 2ms? After an edge? After whatever? This would mean: if I select a region in the middle, every edge would be crossing through the region.For my understanding:I can imagine, that there must be triggered condition already set and triggering before using "must intersect" or "must not intersect" functionality. If so, that would mean, that this is just a filter function (not standalone trigger) which would filter all the already triggered waveforms and display only those which "intersect" with the selected region.In fact, all videos presenting the "must intersect" feature are relying on stable waveforms (=triggered). Who owns already the new 3000T (or even the older 4000 X-Series)? How do the "must intersect" trigger exactly work?Regards,Peter

author: mike_kawasaki
author_rank: Contributor
timestamp: January 26, 2015, 06:33:01 pm
content: Quote from: peter-ger on January 23, 2015, 07:18:47 amPeter, my understanding is the same. The scope triggers and then analyzes the waveforms against the 'must intersect' and 'must not intersect' functionality. This is explained in a technical Keysight documenthttp://literature.cdn.keysight.com/litweb/pdf/5991-1107EN.pdf.Hope this helps,Mike
Rigol DS1054z + DG1022 or DS1074z-S? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: January 26, 2015, 03:37:26 pm
content: I'm one of the folks lined up for a DS1054z scope but I'd also like a function generator. Should I get the all in one DS1074z-S or a DS1054z+DG1022 for about $100 less?

author: metalphreak
author_rank: Frequent Contributor
timestamp: January 26, 2015, 04:27:28 pm
content: Go separates and just hack the DS1054Z if you need the 70+ MHz. Much easier to change settings when you have dedicated screen + knobs for each function!

author: LaurentR
author_rank: Frequent Contributor
timestamp: January 26, 2015, 04:34:20 pm
content: Recent thread:https://www.eevblog.com/forum/testgear/1074z-s-or-1054z-separate-signal-generator/msg587649/#msg587649Bottom line: separate.

author: Howardlong
author_rank: Super Contributor
timestamp: January 26, 2015, 04:58:41 pm
content: Generally, yes, separate units. I bought my MSO1074Z-S for field use, so for me it's really convenient to have it all in one small package. But for lab use, separate.FWIW, apart from differences in functionality, the -S models have the sig gen outputs at the back, and accessing the functionality from an already cluttered menu is less than smooth.

author: BlueBill
author_rank: Regular Contributor
timestamp: January 26, 2015, 05:54:18 pm
content: Thanks everyone, that made it clear. Now Rigol DS1022 or Siglent SGD1025?

author: Lightages
author_rank: Unknown
timestamp: January 26, 2015, 07:11:05 pm
content: I went for the SDG1025 because of the better specs and recommendations here. But it turns out that it might have a problem with log sweep. It is not a deal breaker for many and not for you too perhaps.

author: MisterBiscuit
author_rank: Unknown
timestamp: January 26, 2015, 07:36:20 pm
content: +1 on the SDG1025, although I haven't verified the "log sweep" issue on mine. It had the best bang/buck for me.On the original topic, I'm not really big on multi-function devices as they're usually a compromise of some sort.

author: tautech
author_rank: Super Contributor
timestamp: January 26, 2015, 07:55:17 pm
content: Quote from: Lightages on January 26, 2015, 07:11:05 pmOPThere are a lot of SDG1000 series units "out there", enough to have their own thread:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/There is much information in that thread along with enhancements devised by owners.The Log Sweep has been problematic in it's implementation, with several recent firmware updates to get it exactly right.The latest concerns are for a usuage with a quite fast sweep, otherwise it works as intended.
Do the Rigol DS1054z & DS1074z-S use the same firmware? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: January 20, 2015, 11:26:45 pm
content: Do the Rigol DS1054z & DS1074z-S use the same firmware or at least get the same software updates?

author: Howardlong
author_rank: Super Contributor
timestamp: January 20, 2015, 11:36:52 pm
content: Yes, as do DS1104Z(-S), MSO1074(-S) and MSO1104(-S)

author: Chendy
author_rank: Contributor
timestamp: January 26, 2015, 01:43:12 pm
content: Does this mean the well publicised DS1054Z 100 Mhz 'updates' work on the DS1074z-S?

author: BlueBill
author_rank: Regular Contributor
timestamp: January 26, 2015, 03:38:32 pm
content: From what I can tell the updates are unlocked with a numeric key based on the units serial number.

author: metalphreak
author_rank: Frequent Contributor
timestamp: January 26, 2015, 04:25:44 pm
content: Quote from: Chendy on January 26, 2015, 01:43:12 pmYes I can confirm they do.
HP 16500B with 16533A/34A - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: January 25, 2015, 02:48:46 pm
content: Forum user "helium" was so nice to post a link to a compatibility matrix for 16500x analyzers..and which card would work...The list tells, that only the 16532A DSO card would work in a 16500B, but not the higher 16533A or 16534A...Interestingly this guy tells otherwise:http://martin-jones.com/2013/04/03/hp-16534a-triggering-problems/Not sure if the triggering problems is the course for not being listed as compatible...but one comment states that such triggering problem also occurs on a 16702A.

author: PaulAm
author_rank: Frequent Contributor
timestamp: January 26, 2015, 01:01:56 am
content: The 16534a works fine with the 16500b. At least if the board is working. I have one in my 16500b.Watch for nvram battery end of life on those. All of the calibration info is stored in it. If you change out the nvram, a selfcal will put everything right.I got one of these cheap because of that failure.
Siglent SDS1102CML alternative firmware - Page 1
Forum section: electronics / testgear

author: diodak
author_rank: Regular Contributor
timestamp: January 24, 2015, 03:44:27 pm
content: SDS1102CML with firmware from LeCroy (Waveace 1012 - waveace1xxx_5.01.02.27) works ok. However, you need a cfg file. CFG from Siglent is 337,336 bytes. Of which 336,960B (480 * 234 * 3) is the boot logo (negative bmp). The remaining 376 bytes are some configuration and model name. Does anyone have a Lecroy cfg file?
RF Test Plan Sample? - Page 1
Forum section: electronics / testgear

author: nicedwarf
author_rank: Newbie
timestamp: January 24, 2015, 07:17:06 am
content: Hi,I will be working on developing an RF test plan in my new job in the coming months. I'd like to get up to speed by taking a look at a couple of sample RF test plans that might be floating around. Ideally the plan would be typical of what one might use at the test bench or on a production line (requiring multiple steps, maybe loops, delays, pass/fail, etc). Are there any links/samples you all can point me to?Thanks
USB Oscilloscope Accuracy???  - Page 1
Forum section: electronics / testgear

author: rado_1
author_rank: Newbie
timestamp: January 26, 2015, 07:38:16 pm
content: Hello Everybody!I Watch EEVblog channel on YouTube for some years now, but im new here i this forum. First excuse me for my English it is not my native language and 2nd: electronics is just my hobby, im not engineer or geek im just a noob!Anyway this is my question:I have a Chinese bu***it oscilloscope "Instrustar".... ( I know, my budget was limited) and for some time now i was wondering if this scope is accurate. I made a photo of the screen with the data from an Arduino on pin 4, this is the simple code i use:Code:void setup() {pinMode(4, OUTPUT);}void loop() {digitalWrite(4, HIGH);delay(100);digitalWrite(4, LOW);delay(100);}and this is the data from the scope:If someone of you have good oscilloscope and Arduino can u pls make the same test and send me the result to compare it, a least to know if this junk does the job for simple projects.If not to trash it and to buy an RIGOL....Thx...

author: cncjerry
author_rank: Unknown
timestamp: January 27, 2015, 02:12:26 am
content: I happened to have an arduino uno sitting here and I was playing around with my old Tektronix TDS744a which has been upgraded to a TDS784A and thought, what the hell, here you go. The low res BMP doesn't do the display justice. I was also using an active probe, P6205, which I don't have a lot of time on but it maps at least by frequency to your scope. The variance in voltages could easily be due to the USB port as I was using a mac.

author: Dave
author_rank: Super Contributor
timestamp: January 27, 2015, 02:21:02 am
content: What exactly is wrong with the graph in the first image? Looks fine to me.

author: rado_1
author_rank: Newbie
timestamp: January 27, 2015, 09:30:59 am
content: Quote from: cncjerry on January 27, 2015, 02:12:26 amThank you my friend. So from what i see my 70$ scope does the job for now.

author: rado_1
author_rank: Newbie
timestamp: January 27, 2015, 09:32:30 am
content: Quote from: Dave on January 27, 2015, 02:21:02 amI was just to compare my junk skope with some normal scope.

author: Rick Law
author_rank: Super Contributor
timestamp: January 27, 2015, 06:16:14 pm
content: Quote from: rado_1 on January 26, 2015, 07:38:16 pmJunk is something that cannot do any productive job foryou. Your scope shown the square wave well. A lot of noise, yes; but that is a problem for any scope and it is just a matter of degree.However good a scope and however expensive a scope, there will be something that expensive scope couldn't do (and other more expensive one might...)If the scope is helpingyou, then foryou, it is not junk. If you need see something that the scope cannot show, it has a short coming - that still doesn't make it junk if it helps you.I use a low price USB scope (Hantek 6022BE). I would like a more capable scope, but I cannot cost-justify it. Junk for some, but useful to me.
Just got a Triplett 630 - Page 1
Forum section: electronics / testgear

author: K6EEP
author_rank: Contributor
timestamp: January 24, 2015, 02:24:01 am
content: I bought a used Triplett 630 on EBay for $29.95 US. As-is. I could tell it had been banged up a bit. But I thought it was worth a go.It just came today. So I tore it apart. Used some nice pictures from EEVBlog #634 to compare mine to. And after fixing a couple minor things it now works great. Looks like the meter was replaced. Guess what the main reason was it didn't work? I'll give you a hint it's in the picture.LOL I love it!

author: Vgkid
author_rank: Super Contributor
timestamp: January 24, 2015, 02:46:05 am
content: Is it the wire that should not be loose?

author: benjamin545
author_rank: Contributor
timestamp: January 24, 2015, 02:59:29 am
content: was there something holding the meter movement in place for transport on the supposedly replaced meter.

author: K6EEP
author_rank: Contributor
timestamp: January 24, 2015, 03:20:04 am
content: Yes they put meter shunts on new meters so they don't get damaged before they are installed. This one never got removed after the meter was installed. This is a spring loaded version. Sometimes they are just wire wrapped around the terminals. Usually I see this on sensitive meter movements. Like uA meters. On the EEVBlog videos you can see what kind of static voltage levels can be generated by moving things around. So blasting a sensitive meter movement with static voltage on the terminals could wrap the needle around the peg at the high end of the scale. Ok maybe not that extreme but it can damage it.
Backing Up HP S/A Memory Cards - Page 1
Forum section: electronics / testgear

author: RF-Engineer
author_rank: Contributor
timestamp: December 17, 2014, 06:19:31 pm
content: Anyone know if it's possible to back-up HP spectrum analyzer memory cards? I have a HP 8560E with phase noise test suite that comes on two thin memory cards. Thanks!

author: jfphp
author_rank: Regular Contributor
timestamp: January 19, 2015, 05:16:00 pm
content: Only on battery backup ram cards : the ROM card where this program is stored in not available empty for the public. Of course, when you read the original ROM card, you get an hex/binary listing of the program.

author: jfphp
author_rank: Regular Contributor
timestamp: January 19, 2015, 05:19:31 pm
content: I forgot : it is, of course, impossible to load the prog into the SA and to download it to an empty battery backup RAM card. If yes, HP would have sold quite a few prog cards for the 856XX and 859XX SA...

author: jadew
author_rank: Frequent Contributor
timestamp: January 19, 2015, 05:47:30 pm
content: I'm actually looking to get some data out of a mass memory storage thing. Some of the programs are on trial and after you use them X times they delete themselves. They are pretty nice and I think they're worth saving.

author: MarkL
author_rank: Unknown
timestamp: January 20, 2015, 03:10:11 pm
content: Quote from: jfphp on January 19, 2015, 05:19:31 pmBut it is possible to load the prog card into the SA and then extract the various DLPs, KEYDEFs, ACTDEFs, etc. via the GPIB port.I needed to move an option 103 board and I was able to copy the quasi-peak and EMC drivers from one 859x to another without the prog card.

author: TSL
author_rank: Regular Contributor
timestamp: January 20, 2015, 07:27:35 pm
content: This sounds like a similar problem that's been had with the SRAM cards in HP 892x/8935s etc. The RF Tools program is loaded from an SRAM card in an 892x and so it becomes a problem when cards start to fail etc.There's a yahoo group here for these analyzers...https://groups.yahoo.com/neo/groups/hp8924/infoIn the files section there is a windows program called "Memory Card Explore" that will allow you to read your SRAM card on a computer equipped with an PC slot. There is also winXP drivers there too.This has saved many an 892x owner from loosing their expensive RF Tool set.This program may work for you.regardsTim

author: jfphp
author_rank: Regular Contributor
timestamp: January 22, 2015, 05:48:33 pm
content: Yes, but for the 892X it is a PCMCIA card. The cards for the 856XX or the 859XX are quite different.

author: TSL
author_rank: Regular Contributor
timestamp: January 22, 2015, 10:10:55 pm
content: @RF-Engineer if you're just after a Phase Noise utility and you have GPIB connection between your SA and PC, you can always use the free one in the GPIB-toolkit that can be found here...http://www.ke5fx.com/gpib/readme.htmOther cool features include a 7470 Plotter Emulator and others.I use this with my HP8566B for phase noise plots etc.regardsTim
HP 7155B strip chart recorder Manual upgrade - Page 1
Forum section: electronics / testgear

author: jfphp
author_rank: Regular Contributor
timestamp: January 22, 2015, 02:11:57 pm
content: I have got a 7155B with serial number 1925A018XX with options 05 event marker and 135 (?). I have bought the manual by Artekmedia but it covers only SN 1550 and under. My recorder is not the same (3s/cm first span instead of 10s/cm) and the chart drive boards are deeply different : A4 oscillator is running at about 1KHZ instead of 352,2 HZ and the A5 board has nothing to do with the A5 in the manual (parts location and divided frequencies to drive the motor ). Does anybody get the op and svce manual for this SN or the yellow sheets upgrading the sn 1550 manual to the latest SN ? Thanks
Hung Chang oscilloscope. MAX DC offset voltage? - Page 1
Forum section: electronics / testgear

author: valvedoctor
author_rank: Contributor
timestamp: January 18, 2015, 10:17:18 pm
content: I have a KB Electronics oscilloscope, which is one of the crap re-badge beauties that we all know of:http://www.radiomuseum.org/r/hungchang_oscilloscope_os_620_depos.htmlI don't have much experience with the internal working of these scopes, but I have a question.Let's say I want to view the waveform on the plate of a vacuum tube. These can be 300 volts or more DC voltage and I want to view just the AC signal. Would the DC blocking cap in these scopes take this voltage? If not, which capacitor should be replaced to ensure I can safely block up to 500 volts DC.

author: barry14
author_rank: Regular Contributor
timestamp: January 18, 2015, 10:29:31 pm
content: The site at the link you provided has thumbnails of the oscilloscope schematics. You need to sign in to download them. If you do, you should be able to identify the input AC coupling capacitor and see its voltage rating (Included with the schematics is a parts list).

author: Lightages
author_rank: Unknown
timestamp: January 18, 2015, 10:33:29 pm
content: You should be looking at voltages like this with at least a 10X probe. Most of them are rated for 300V. You can buy probes rated much at over 2.5Kv pretty cheap online. Seeing as you are looking at plate voltages there isn't any real high energy so it should be very safe. So use a probe rated for the voltage and is 10X attenuator and the oscilloscope never sees anything over 50V. That is the correct way to do it.

author: valvedoctor
author_rank: Contributor
timestamp: January 19, 2015, 01:01:08 am
content: Thanks for the responses. I have a 10x probe so I guess I'll leave the scope alone. Thanks!!

author: bktemp
author_rank: Super Contributor
timestamp: January 19, 2015, 07:48:56 am
content: Quote from: Lightages on January 18, 2015, 10:33:29 pmNo! A 10x attenuator is only a 9M resistor. With the scope set to AC coupling, the coupling capacitor will get charged to the full DC voltage, regardless of the attenuator used.There are some scopes with the 1M input resistor in front of the coupling cap, but most scopes have the 1M resistor after the cap.

author: Lightages
author_rank: Unknown
timestamp: January 19, 2015, 03:09:45 pm
content: Hmmm.... You are correct. There are probes with a voltage divider inside. It is better to get one of those. My apologies.

author: Lightages
author_rank: Unknown
timestamp: January 19, 2015, 03:34:02 pm
content: Actually you can build your own voltage divider for a probe. There are tutorials on the web.

author: Lightages
author_rank: Unknown
timestamp: January 21, 2015, 05:35:49 am
content: I am sorry for my misinformation and I don't know why I didn't think fo this sooner. Have a look at this video posted here:http://www.eevblog.com/2010/05/08/eevblog-85-high-voltage-oscilloscope-probe-design/
Rigol DS1000 / MSO1000 Decoder and Recorder simultaneously? - Page 1
Forum section: electronics / testgear

author: 3s1d
author_rank: Newbie
timestamp: January 20, 2015, 11:45:21 pm
content: HiI just realized that my Rigol MSO1074Z can not use any decoder while the recorder is enabled and vice versa. Decoding recorded events would really be handy.Can anybody confirm this issue and/or tell my a work-around/trick.The following is possible: You can scroll through the recordings and select the one of most interest. Than you can disable the recording, enable the decoder, and look at your data w/o loosing the the waveforms. However, all other recordings get lost.RegardsJuergen

author: aviphysics
author_rank: Contributor
timestamp: January 21, 2015, 04:00:04 am
content: Is there a way to export recorded waves to a computer? If so, you could use a python scrypt, or matlab, or any number of things to decode a recorded trace.
Lan connector Rigol 1102E - Page 1
Forum section: electronics / testgear

author: StephF
author_rank: Newbie
timestamp: January 21, 2015, 08:07:05 am
content: Please pardon this fairly newb type question ?What is the benefit of having a RJ-45 type lan connection on my Rigol scope ?

author: DIPLover
author_rank: Regular Contributor
timestamp: January 21, 2015, 05:39:09 pm
content: a LAN connector, or any other communication interface, opens up the possibility of remote control and automation of oscilloscope operation, as well as transfer of measurement data to a computer.

author: StephF
author_rank: Newbie
timestamp: January 22, 2015, 08:48:13 am
content: Got it, thanks !
Fluke Connect App Issues - Page 1
Forum section: electronics / testgear

author: MITTS
author_rank: Contributor
timestamp: December 09, 2014, 02:02:44 pm
content: Anybody else having issues using the Fluke Connect App?The basic features like remote view of readings have worked for me but every other feature has been a struggle with data logging being the worst.The latest app revision says improved logging features and bug fixes.When I first got these if you tried to download the data the system would time out and not complete because the data transfer is very slow. Now there is no time limit but now the app crashes or locks up. These are still useless with data logging for me.Another improvement listed on the app (version 1.17) dated 11/24/14 says "complete equipment redesign"Did they redesign the moduals since the origional FC pieces or are they referring about something else?When I call them they say they know they have issues so I was giving some time for them to work through them but it's been months now and these things still don't work for me

author: MITTS
author_rank: Contributor
timestamp: December 11, 2014, 05:18:12 pm
content: I must be the only sucker on the fourm who paid for these

author: MITTS
author_rank: Contributor
timestamp: January 13, 2015, 09:34:27 pm
content: Beware of the latest update.Will not load my iPhone and crashes on my android phone.Shame on you Fluke for putting out such garbage!!

author: MITTS
author_rank: Contributor
timestamp: January 20, 2015, 07:14:54 pm
content: I wiped them both clean and reset up everything.Everything appears to be back to working as well as before they 5hit the bed
Energy Concepts Inc Electricity / Electronics Training System - Page 1
Forum section: electronics / testgear

author: starlight_tools
author_rank: Contributor
timestamp: January 20, 2015, 11:17:55 pm
content: I just picked up a Energy Concepts Inc Electricity / Electronics Training System from a friend that was cleaning up his garage.It consists of a Model 50200 Digital Multimeter and the Model 60100 Universal Counter/Timer which both appear to work OK, but the Model 20900 Combination Power Supply seems to ramps up from 0 to 300 VDC but then seems to hold and not go back down and one of the 10-26V also holds the voltage with out varying.Does anybody have a copy of the manual / Schematic that they would be willing to email me?ThanksWalter
Rigol DS1000Z-S sig gen questions - Page 1
Forum section: electronics / testgear

author: bson
author_rank: Unknown
timestamp: January 20, 2015, 01:39:16 am
content: Hey guys, I couldn't an answer to this anywhere, and need to jump through hoops to download the manual(s) from their main site. Perhaps one of you with a DS1kZ with the signal generator (-S) can answer this?I'm wondering two things: can it generate multi-component signals, like 1k+19k+20kHz, and can it automatically null against the generated signal for distortion analysis? Can it generate a sweep? With nulling? Waterfall plots? (OK, I guess that's more than two questions.)

author: Howardlong
author_rank: Super Contributor
timestamp: January 20, 2015, 10:29:59 am
content: Quote from: bson on January 20, 2015, 01:39:16 amIt can do simple modulation (e.g. AM and FM) but that's as far as it goes directly. If you are very patient indeed you could set up a 1k+19k+20k waveform with the arb because there is a harminic relationship in that example that wouldn't be beyond the sampling rate available, but it would be a labour of love to set it up. I don't know if it's possible to define arb waveforms outside the scope, perhaps someone's achieved that?There is no sweep.It can't do waterfall plots, although that's a function of the scope rather than the signal generator. it will do instantaneous FFT though.

author: Mark_O
author_rank: Frequent Contributor
timestamp: January 20, 2015, 04:29:16 pm
content: Quote from: Howardlong on January 20, 2015, 10:29:59 amI believe this can be achieved indirectly, using FM with a low-freq ramp.

author: Mark_O
author_rank: Frequent Contributor
timestamp: January 20, 2015, 04:31:28 pm
content: Quote from: bson on January 20, 2015, 01:39:16 amWhat other arb-gens are you familiar with that can do all these things?

author: Howardlong
author_rank: Super Contributor
timestamp: January 20, 2015, 04:33:16 pm
content: Quote from: Mark_O on January 20, 2015, 04:29:16 pmClever fella!
open6022 install, manual, etc - Page 1
Forum section: electronics / testgear

author: mtnzap73
author_rank: Contributor
timestamp: January 20, 2015, 05:13:17 am
content: It appears that any links I can find to open6022 documentation are non-functional (e.g. jmp.sh). Are there any current links to install instructions? Or is it as simple as replacing files in an existing Hantek-SW install?Further:I found a working link to the manual.It really does look great!Thanks RichardK.
HP 16510B pod connection - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: January 19, 2015, 05:48:54 pm
content: Forgive me being a total noob when it comes to logic analyzers....well...not how they work or what they are used for (o;Sitteng next to me is a 16500A with a 16510B LA card and pod cables....missing the probe connector for hokking up the probes...But...I have probe adapter from an old Philips logic analyzer..and the corresponding probes....whos connector fits right into the 16510B pod cable...Now the big question...as I haven't found anything referenced in the 16510B manual....what is the pinout of the pod cable? Or is it somehow a standard most manufacturers follow?

author: rf-loop
author_rank: Super Contributor
timestamp: January 19, 2015, 06:18:16 pm
content: Do this help anything?http://cp.literature.agilent.com/litweb/pdf/5962-8620E.pdfBut also I have some these units and long time ago I have looked some manual, perhaps service manual or some other where was full explanation and details...

author: davorin
author_rank: Unknown
timestamp: January 19, 2015, 07:14:40 pm
content: That one manual I've missed (o;Hmm...no analyzing yet though when I supply a simple periodic signal with a Raspberry Pi....Not sure if the card is broken or I am just too stupid using this device...seems more complicated than a LeCroy 9354AL ;-)

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: January 19, 2015, 07:47:05 pm
content: Quote from: davorin on January 19, 2015, 07:14:40 pmi did a simple video to show my friends my 1670G, the software is the same? i think as the 16500(ignore me trying to stuff a hex number into the binary field lol!)
Getting ready to buy - Page 1
Forum section: electronics / testgear

author: Docholiday
author_rank: Regular Contributor
timestamp: January 19, 2015, 05:16:54 pm
content: Hi everybody,I have an opportunity to buy a still in the box yokogawa DL7100. So, I am looking for someone in the Los Angeles or Ventura County area to help me with this purchase. Specifically, if someone can look at it and test it I guess. I am only in my second year of Electrical Engineering so my knowledge is limited. I have access to the scope and can bring it to you.Thank You,Nicholas
Proper care for a bench power supply - Page 1
Forum section: electronics / testgear

author: rrick
author_rank: Newbie
timestamp: January 19, 2015, 05:15:00 pm
content: I have two variable DC power supplies, a switching 25 V and a linear 60/5/60 V. The manuals of either model don't really state what I should not do with them. An example regarding back feed: I was able to pump a 6mF capacitor up to 120V then dial down the voltage while still connected, so something internal absorbed the stored energy. What happens when I connect the power supply to a battery? Another concern is short circuiting. Are they fully protected across the entire range of dV/dt?

author: jadew
author_rank: Frequent Contributor
timestamp: January 19, 2015, 05:36:09 pm
content: Hi Rick,Welcome to the forum.It depends a lot on the power supply but they should be fully protected against short circuits.The reverse current issue could be handled in several ways:1) If the power supply is designed to also sink current, it will sink it and bring the level down to the set level.2) If it has a simple reverse current diode, it will bypass the output stage and end up back in the power rail that feeds the power supply - not a very good thing.3) Could simply be blocked and the current draw that you noticed might be simply due to an internal dummy load.Generally speaking they should support all kind of abuse, but as I said above, it's highly dependent on the power supply.
HP 3485A service manual - Page 1
Forum section: electronics / testgear

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 18, 2015, 02:08:20 pm
content: Hi,I have seen a dude post the manual in herehttp://www.avrfreaks.net/comment/825364#comment-825364But I think the site is down for now, I want to know if you have the manual some where, so I can take a look at it too.Best Regards

author: PA0PBZ
author_rank: Super Contributor
timestamp: January 18, 2015, 03:06:06 pm
content: I think you are looking for 3458A, not 3485A:http://www.ko4bb.com/manuals/download.php?file=HP_Agilent/HP_3458_8.5_Digit_Bench_Multimeter/HP_3458_CLIP.pdf

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 19, 2015, 05:46:26 am
content: Thanks for the info, I wish I could find the 3485A model too.
Car Battery Tester?? - Page 1
Forum section: electronics / testgear

author: Elantramax1
author_rank: Contributor
timestamp: January 18, 2015, 10:51:15 pm
content: Hi all. This may sound like a Stupid Question.How does the Midtronics (And other like it) actually Test the Battery? I have a Solar brand one. Tells me the V and Amp Capacity of the Battery. I saw a You-Tube where the guy said it Tests the Conductance. Now I am watching someone use a Harbor Freight Tester. And it shows V and M Ohms. I was always told you cant check the Resistance on a Charged Circuit. Unless that is not entirely True.Thanks
Oscilloscope Goldstar OS-9020A - Page 1
Forum section: electronics / testgear

author: crystal
author_rank: Contributor
timestamp: January 08, 2015, 02:10:18 pm
content: Thanks to this blog I decided to buy an oscilloscope. It is my first scope, Goldstar OS-9020A. It's almost brand new, very hardly used if not at all. Inside I see nothing has been repaired, all the caps looks good.How do I check is it working properly? Maybe 5 minutes after turning on whe it heats up a little bit the trace rotates for maybe 2-3mm, probably some cap is slightly off but I couldn't find any is wrong. Also when TIME/DIV is set to 2ms or less the trace become flickering, the more you go down the more flickering it is. Is it normal or not?Also could anyone help me with service manual? It came with user manual but it's on German language and with original probe that came with it.

author: rqsall
author_rank: Regular Contributor
timestamp: January 08, 2015, 03:27:27 pm
content: I've put up a service manual for the Goldstar 9020G, which is pretty much the same except for the built in function generator the 'G' version has.http://fergus.7bits.nl/~ian/f9744ba778.pdfI'm trying to repair a 9020A at the moment and found this after searching almost forever.Good luck.

author: crystal
author_rank: Contributor
timestamp: January 08, 2015, 09:56:34 pm
content: Quote from: rqsall on January 08, 2015, 03:27:27 pmThanks man. It's really the same, same part numbers on the PCB.

author: Howardlong
author_rank: Super Contributor
timestamp: January 09, 2015, 12:19:32 am
content: Not sure from what you say whether you're learning how to use it, or have a genuine concern based on previous scope experienceTake a look at this video on how to check out an analogue scopehttp://www.eevblog.com/2013/08/03/eevblog-502-19-hameg-analog-oscilloscope/Of you're unsure, shoot a Youtube video of what you're seeing and post it here.

author: crystal
author_rank: Contributor
timestamp: January 11, 2015, 12:25:57 am
content: That video is really just a teardown of that Hameg. Watched it, doesn't helped me a lot.I am looking for some good tutorial video of how to use an oscilloscope and what to expect and how the proper functional oscilloscope should behave and work. I suspect during the learning all the faults it may have should be exposed. Right now the trigger section is somehow not all clear to me.

author: Howardlong
author_rank: Super Contributor
timestamp: January 11, 2015, 01:05:35 am
content: I'd say the first 15 minutes are generic and relevent to any analogue scope, sorry if I you felt I gave you a bum steer.Did you do a video of what you're experiencing as I suggested? Maybe we can help you further.W2aew does a superb channel on youtube for oscillosopes, but I am not sure that's the level you're asking for?

author: crystal
author_rank: Contributor
timestamp: January 18, 2015, 05:52:31 pm
content: I just changed some caps in the power supply and It seems much better now, triggering works just like I saw on some youtube videos. Now it shows 100Khz from the de5000 very clear, before it was kind of a messy.For anyone watch this in the future the caps I changed are c902, 903, 905, 906.