hybridfree/eevblog-posts huggingface dataset:
DM3068, '512 K rdgs Volatile Memory' ? - Page 1
Forum section: electronics / testgear

author: KedasProbe
author_rank: Frequent Contributor
timestamp: August 23, 2013, 11:35:39 am
content: Anyone know how you can use this 512k readings (volatile memory)?I assumed it would be the stored history but it only goes up to 5000, the same as the number of readings that you can store on the device (10 sets).(I contacted Rigol China but still no reaction from them.)

author: Unknown
author_rank: Unknown
timestamp: August 23, 2013, 12:20:49 pm
content: Maybe it's only accessible programatically via one of the computer interfaces (eg. USB, LAN)?The support is about what I would expect from them.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: August 23, 2013, 04:04:51 pm
content: Quote from: alm on August 23, 2013, 12:20:49 pmI didn't see/found a way to do that over LAN.It would also defeat having more local memory if you have to continuously offload samples to a PC.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: August 23, 2013, 05:31:18 pm
content: This is a screen of the DM3051 with 2M of memory (correct): (http://www.rigol.com/prodserv/DM305X/)and the DM3068 that should have 512k of memory (wrong): (http://www.rigol.com/prodserv/DM3068/)

author: Unknown
author_rank: Unknown
timestamp: August 23, 2013, 05:48:46 pm
content: On the other hand you're not going to read 512k points from the front panel either. If you look into the programmer's manual, then it looks like INITiate stores the results in non-volatile memory, and READ? in volatile memory. So issuing READ? may result in 512k points being saved. Maybe this is exposed in the Rigol software?The datasheet also mentions 10 groups of 5000 points in non-volatile memory, so apparently it's storing the points in non-volatile memory. Does exporting to USB save more than 5000 points? The user manual talks about history displaying the 'last 5000 points'.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: August 24, 2013, 09:01:12 am
content: NoI think they made a mistake in the firmware using the same limit as the non-volatile memory limit.Because in the DM3058(E) both are the same 2000, hence making this mistake more likely.The only thing I don't get is how no one reported this sooner (it's false advertising), or maybe this bug was introduced in a later firmware upgrade by sharing new DM3058 code....And no you don't watch 512k reading on the device not even 5000 you save them on USB.(for long measurements keeping a PC with LAN working during the night is not an reliable solution)

author: HKJ
author_rank: Super Contributor
timestamp: August 24, 2013, 02:05:56 pm
content: Quote from: KedasProbe on August 24, 2013, 09:01:12 amIt might not be on the DM3068 (I never got the lan working on mine), but on my other equipment (Fluke & TTi) it is very reliable.
DS2072 serial decoding... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: August 23, 2013, 08:47:30 pm
content: Hi Everyone,I've played around with it a bit and one thing that annoys me is that it begins to analyze what is visible on the display only. If you scroll the trigger point off to the left, it tries to decode at the screen edge and not at the trigger point. Shouldn't it decode from the trigger point and decode ALL of what is in memory? Or least what is visible?Thanks,Alan
isotech 658 - Page 1
Forum section: electronics / testgear

author: trebor
author_rank: Newbie
timestamp: August 22, 2013, 05:17:46 pm
content: hi, does anyone know where i can get a circuit diagram and calibration details for this scope.ISOTECH 658thanks

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 22, 2013, 05:59:13 pm
content: https://www.eevblog.com/forum/projects/iso-tech-gwinstek-range-oscilloscope-schematic/

author: trebor
author_rank: Newbie
timestamp: August 22, 2013, 06:37:21 pm
content: thanks for the reply, i have downloaded from the link, i will study the pages carefullythanks again

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 22, 2013, 06:51:37 pm
content: No need to study, it is in the first post:"Thought I would make the Schematic available to anyone who needs it, just PM me, its too large to attach"

author: trebor
author_rank: Newbie
timestamp: August 22, 2013, 08:48:51 pm
content: ok thanks again
Rigol support - Page 1
Forum section: electronics / testgear

author: iceisfun
author_rank: Regular Contributor
timestamp: August 23, 2013, 05:02:52 pm
content: I just got a Rigol DS2072 and one of my probes was messed up, I was a little worried that it would be a pain to get it replaced but I sent a support request to Rigol and they turned it around next morning and a new probe is on the way out no problem!Good on Rigol

author: mcinque
author_rank: Unknown
timestamp: August 23, 2013, 08:43:15 pm
content: My experience with Rigol was fine, the only major issue I've noticed is that you have to request periodically the availability of a new firmware because at the moment they don't publish the updates on the web site (sounds stupid IMHO).

author: rastro
author_rank: Frequent Contributor
timestamp: August 23, 2013, 08:48:23 pm
content: I also recently purchased a Rigol DS2072 and had also had a probe issue. I found a intermittent short on one of the 10X probes. Went through Tequipment for warranty replacement. A new one is in the mail. I hope the Rigol probes show long term reliability and this is just a coincident.
GW Instek Bench Meter - Page 1
Forum section: electronics / testgear

author: Computeruser
author_rank: Regular Contributor
timestamp: August 22, 2013, 01:53:26 am
content: Shortly after Dave reviewed the GW Instek 2304 Digital Scope and had a number of issues with it, I got one on sale in North America and purchased it. It works great and there is new firmware out for it in the last week or so (V1.17). I like the alternate trigger that allows me to display 2 different frequency waveforms at the same time. I have not had any of the problems Dave had.Instek has a 6 1/2 digit bench multimeter (GDM-8261). This looks like it would serve me as well as the Agilent 34461A for somewhat less money.Any thoughts (helpful thoughts)? ........ C
Review Fluke CNX 3000 kits – The Multimeter for the electricians - Page 1
Forum section: electronics / testgear

author: Tooms
author_rank: Unknown
timestamp: August 18, 2013, 09:06:50 pm
content: HiJust to say that i have just posted my review of the Fluke CNX 3000 kits.It can be found here at my website:http://www.tooms.dk/Tblog/Showblog1.asp?BlogID=201308181816447018Tooms

author: retiredcaps
author_rank: Super Contributor
timestamp: August 21, 2013, 06:46:27 am
content: Great thorough review.I'm unlikely to ever get one, but I did enjoy the pictures and tests.

author: Tooms
author_rank: Unknown
timestamp: August 21, 2013, 10:31:05 am
content: Thanks retiredcaps, yes it is more for electricians then for eletronics work.Tooms
scope + spectrum analyzer, back to the future? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: August 20, 2013, 08:55:45 pm
content: http://www.ebay.com/itm/Tektronix-7613-Oscilloscope-7L12-Spectrum-Analyzer-Combination-/161049347305?_trksid=e17002.m185&_trkparms=algo%3DSIC.NPJS%26its%3DI%26itu%3DUA%26otn%3D6%26pmod%3D281111429323%26ps%3D63%26clkid%3D709322987495482394&_qi=RTM759773#ht_3617wt_1022- might not be the very best speicmen of it's type but it's a cool modular configuration - maybe something for Rigol to consider offering in a new versionand another:http://www.ebay.com/itm/TEKTRONIX-7613-7D01-LOGIC-ANALYZER-DF2-OSCILLOSCOPE/140993441836?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D163%26meid%3D709372132484440505%26pid%3D100005%26prg%3D1088%26rk%3D2%26rkt%3D4%26sd%3D161049347305%26#ht_75wt_1019- Where o' where has Tektronix gone? They seem to have been so far out in front once upon a time...

author: PA4TIM
author_rank: Super Contributor
timestamp: August 20, 2013, 10:04:54 pm
content: There are also SA plugins for the 5XX series from the 60's. A 556 with 1A4 and SA plugin was capable of showing 4 traces and the SA trace at the same time.The plugin systems were great. You had the strangest plugins. A lot of dif amps, uV plugins, Opamp plugins, transistor Tr, curvetracer, digital delay, differential plugins that could supply 200V offset etc. I have a 7704, 7603, 547 and about 15 plugins for each system. (and a few dead 5XX scopes.HP also made great scopes back then. I just heard I get a nice HP-122AR this week. A 1958 scope with tubes and transistors. the owner had it over 30 years. But that is not a plugin scope. Philips, Fairchild/dumond also made plugin scopes in the 60's.RigolI thought we are talking real scopes >:-)
Metrix OX863B Service Manual - Wanted - Page 1
Forum section: electronics / testgear

author: Clint
author_rank: Regular Contributor
timestamp: August 20, 2013, 08:32:10 pm
content: I had a nice Metrix OX863B oscilloscope but last week it failed to display anything, I decided to just sell it for spares and buy a new DSO; but I now have it in my hallway and I am thinking that I should at least have a go at repairing it and then using it again.I have hunted around for a service manual / schematic but to no avail, I wonder if any of you guys may be able to help ?
DG4000 firmware upgrade - Page 1
Forum section: electronics / testgear

author: MrRedHat
author_rank: Unknown
timestamp: August 20, 2013, 01:49:49 am
content: Is the DG4000 software upgradeable? I don’t need the 160MHz version right now, but it would be nice to buy the 60MHz now and upgrade in the future if I need it. I haven’t really seen anything to purchase a software upgrade for it, I just assume that they’re the same hardware with different firmware for each model.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: August 20, 2013, 06:54:59 am
content: No, a DG4102 is always a 100MHz version, for more details search this forum.

author: cybernet
author_rank: Regular Contributor
timestamp: August 20, 2013, 12:06:14 pm
content: Quote from: KedasProbe on August 20, 2013, 06:54:59 amnot yet ...
DS2072 Extended Menu "Project" Gain1,Gain2 - Page 1
Forum section: electronics / testgear

author: rastro
author_rank: Frequent Contributor
timestamp: August 17, 2013, 06:31:44 pm
content: After enabling "Extended System Info" ( while inside Trigger menu). There appears an additional menu on the 2nd page of the "Utility" menu called "Project".Under "Project" menu are 3 more pages that include the following:Screen Test (functional screen test with text explanation)Key Test (functional panel key test with text explanation)Gain1Gain2ResumeCalProbe-CalDefaultDoes anyone know what Gain1/2 controls? It appears to be adjustable.

author: Carrington
author_rank: Super Contributor
timestamp: August 17, 2013, 09:57:40 pm
content: Probably manual offset adjustment, but I do not know.I'm sure, probably there other hidden menu.

author: true
author_rank: Frequent Contributor
timestamp: August 18, 2013, 10:25:22 am
content: Screen Test does some color tests, can look for dead or hot pixels.Button Test looks nice, does exactly what you thinkGain1 adjusts, but I didn't see what it does.Gain2 didn't adjust. (maybe I didn't have ch2 on and that matters?)ResumeCal turned on both channels and a relay clickedProbeCal didn't seem to do anything after I did ResumeCalOne of these two options messed up my calibration, a recal should fix itNothing else special here, only the first two seem useful

author: tlu
author_rank: Regular Contributor
timestamp: August 18, 2013, 04:55:35 pm
content: Quote from: true on August 18, 2013, 10:25:22 amI guess it's safe to do a calibration after it's been keyed and you do not lose the options?

author: true
author_rank: Frequent Contributor
timestamp: August 18, 2013, 06:17:08 pm
content: Quote from: tlu on August 18, 2013, 04:55:35 pmyes that's right
Tektronix 2430  , NVRAM choices.?  - Page 1
Forum section: electronics / testgear

author: endzone
author_rank: Newbie
timestamp: August 18, 2013, 01:55:01 pm
content: Hello.Now that I'm retired, I have spare time. I do AVR work.I rebuilt my Tek 465 and it's 100% reliable now. & updated incandescent x1/x10 lamps to LED (all 4 dead and many hours to replace)but...Now I have added a Tek 2430 to the bench.I want to replace the Dallas (now Maxim) DS1235.I desire an external battery setup, if possible.For sure I will upgrade to a gold machine pin socket 28 DIP.I've read vast numbers of posts on this NVRAM issue. for HP and Tek scopes. (even the xray , and drilling down to cut out old battery trick)Does this below chip work in this application?, has anyone tired it? mouser has them, in stock..Cypress STK16C88STORE/RECALL Cycle (seems to be the issue here) it says it has automatic recall, on power up/?thanks for any ideas/help /directions.

author: Orange
author_rank: Frequent Contributor
timestamp: August 18, 2013, 02:25:32 pm
content: Just a side remark and warning,These scopes are very sensitive for running with the cover off. It will destroy the almost unobtainable hybrids due to overheating..As for the DS rams. I don't see the issue. if it's battery is worn out, you can replace it with a new one... Recalibration is needed anyhow then.If you don't want to recal, then first read it on a programmer while the bat is still good, and program the new one. The chips are about $10, but last for more as 10 years.

author: endzone
author_rank: Newbie
timestamp: August 18, 2013, 05:30:42 pm
content: yes, and thanks,and the book shows the the reason for lost factory calibr. page 209...wow, STmicro sells one too, a 2nd source, I never know others made NVram like dallas.M48Z35Y-70PC1so no need to worry, for 10 more years... great.
What is your Dream Team? Scope, Sig.Gen, DMM, etc.. - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: August 15, 2013, 12:27:55 am
content: Down to Earth, Realistic!under $20Kusd. or 3-5 years of savings.

author: c4757p
author_rank: Super Contributor
timestamp: August 15, 2013, 12:33:15 am
content: All of 'em.

author: Unknown
author_rank: Unknown
timestamp: August 17, 2013, 03:45:27 am
content: Great Answer, but...ill be happy with these...Santa, I want a Rigol DS6K4 or/and Agilent M/DSOX4K4, with Diff. Probes & all that stuff, why?because they have a 10MHz Input/Output.Also want a Stanford FS725 Benchtop Rubidium Frequency Standard, why?to connect that to the Input of the Scope.also want an Agilent 33500B fully expanded 2-channels OCX option, ARB, etc... that also has a 10MHz input, connected to the Stanford output.Imagine the whole system connected to a single clock?, Amazing.I promise ill be a good boy.

author: wkb
author_rank: Super Contributor
timestamp: August 17, 2013, 10:18:06 pm
content: duh.. be happy with what you realistically can afford AND know how to use.* wkb is happy with the Tek 2465 scope just to name an example.

author: c4757p
author_rank: Super Contributor
timestamp: August 17, 2013, 10:25:13 pm
content: OK......Santa, I want a Tek 2467, an Agilent MSOX3034A, an Agilent 34461A, a Rigol DG4102, a Rigol DS4024, a Tek MDO4054-3, one random piece of equipment from The Signal Path, and a puppy. Please?

author: dr.diesel
author_rank: Super Contributor
timestamp: August 17, 2013, 10:30:04 pm
content: I want a huge pile of organized parts and a 20 year old smoking hot brunette to hold my iron!You said Dream

author: c4757p
author_rank: Super Contributor
timestamp: August 17, 2013, 10:32:02 pm
content: Quote from: dr.diesel on August 17, 2013, 10:30:04 pmHuh, "iron". Haven't heard that one before.
Graph paper servo recorders  - Page 1
Forum section: electronics / testgear

author: Psi
author_rank: Super Contributor
timestamp: August 17, 2013, 10:45:30 am
content: Picked up two graph paper servo recorders at a local ham radio market day for $30 inc 7 extra rolls of graph paper.The one on the left is tube based and the other is solid state.I'm quite happy that the both work fine. Now i have to decide what to do with them?I was thinking maybe use them to graph the discharge of multicell lithium RC batteries. Have some relays that alternates between each cell tap and then join the lines together by hand with a pen.

author: N2IXK
author_rank: Frequent Contributor
timestamp: August 17, 2013, 03:30:19 pm
content: Cool. Do those have an X-Y mode, or voltage vs. time only? If they have an X-Y mode, they are good for tracing characteristic curves for tubes or semiconductors. Anode current vs. grid voltage, etc.Those types of units were once common in chemistry labs, where they were used for graphing the output from spectrometers, gas chromatographs, etc.At least your units use standard paper (although tractor feed graph paper may not be all that easy to get nowadays). The lab I work in used to use a fleet of Honeywell "Visicorder" recording oscillographs, which used galvanometer-driven mirrors to expose photosensitive paper with UV light from a mercury arc lamp. I finally had to retire them when Eastman Kodak stopped producing the recording paper back in the early 90's. Replaced them with thermal paper chart recorders, then finally with PC-based DAQ systems.

author: Psi
author_rank: Super Contributor
timestamp: August 17, 2013, 09:03:44 pm
content: ive not checked the manual yet but i doubt the solid state one has x-y.The valve one has a large number of inputs on the back for control so proably does.in any case it wouldnt be hard to hack that function into them.
Gossen Metrahit World - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: August 16, 2013, 05:13:29 pm
content: Does anyone own one of these multimeters? I would like to know how these are compared to the Fluke 87/179, and the Agilent 1272/1273, and maybe even the 1253B. Any input would be appreciated.

author: Mr Simpleton
author_rank: Unknown
timestamp: August 16, 2013, 06:13:56 pm
content: Listen to Daveespeciallty at 22:22

author: nanofrog
author_rank: Super Contributor
timestamp: August 16, 2013, 06:34:40 pm
content: If you go for Gossen in the US, it's sold under the brand name of Dranetz. Good stuff, but it's expensive. Even more so than Fluke.

author: echen1024
author_rank: Super Contributor
timestamp: August 16, 2013, 08:01:25 pm
content: I just can't seem to find a review of their cheaper "World" model. I have seen this review, and want it for it's ultra clacky range switch, and the blocking sockets. This one is a little to expensive.
Agilent DMM's - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: August 15, 2013, 09:22:49 pm
content: For general hobby work, what would the best Agilent DMM be? My father has a few friends in Agilent who can help me purchase one through their EPP. I like the 1251 series for the frequency counter and the programmable square wave gen, but the cheaper 1272 seems a lot more attractive, being thinner on my space-constrained bench, however the cap range seems screwy. Any input would be appreciated. I do not want the OLED displays.

author: nanofrog
author_rank: Super Contributor
timestamp: August 16, 2013, 01:54:56 am
content: I have a U1252B used primarily on my bench. Quite pleased with it overall (not perfect; there are reviews of it and it's predecessor <A model> for further information in this forum if you search).Brymen is another one worth taking a look at for value IMHO, the BM869 model in particular (run the numbers, and see what best fits features for price).

author: saturation
author_rank: Super Contributor
timestamp: August 16, 2013, 04:27:42 pm
content: For pure bench use the 1252a or b is better as its more accurate, but if you intend to take it outdoors quite a bit, the 1272a is more rugged.Beyond basic measurements, both have specific features absent from each other, so list each out and see if some are more important to you. I frankly never use the added features.I have both as they were given to me.If I had to choose one, it would be the 1252a because I don't do field work professionally.
HP Power Supply - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: August 23, 2013, 04:30:05 am
content: I am looking to buy my first decent power supply off of eBay, and have a couple of questions.Is around $100 for a E361x series power supply good?andI have seen many HP 'system' DC power supplies. Other than the terminals being on the back, what is the difference?

author: ve7xen
author_rank: Super Contributor
timestamp: August 23, 2013, 06:29:48 am
content: Around $100 is a decent price for these in most parts. Great supply, though no fancy features.The system supplies tend to be larger and louder, other than that the specs are usually similar or often better. They're probably more of a pain to configure on the fly as well.

author: rdl
author_rank: Super Contributor
timestamp: August 23, 2013, 03:46:22 pm
content: If it works correctly, that price is about as good as it gets. If shipping is included it's even better.Be sure to question the seller carefully. Common problems with these power supplies are split /cracked binding posts and buttons. Make sure its for the correct voltage you need (115v/230v), not all versions can be easily changed.Stress that they must pack it very very well or you will likely receive it with damage to the front panel controls and/or the rear heat sink fins.I got one where they wrapped bubble pack around the top, bottom and sides, but the heat sink and front panel were right against the bare cardboard of the box. That one survived somehow, probably because it came by US Post Office and not FedEx or UPS.

author: edavid
author_rank: Super Contributor
timestamp: August 23, 2013, 04:05:55 pm
content: Quote from: echen1024 on August 23, 2013, 04:30:05 amIt means programmable, usually via GPIB. Some of the non-system supplies have programming options too.
Extech 382280 - Page 1
Forum section: electronics / testgear

author: twjtwj
author_rank: Contributor
timestamp: August 18, 2013, 01:54:19 am
content: I received an Extech 382280 power supply last week and thought I'd discuss what I think of it. I'm just getting into electronics so this will be VERY basic on things I noticed and didn't like. Again I'm new at this, so please correct me if I'm wrong anywhere and can solve any of my dislikes.I've also attached pictures which show as follows:Picture 1: front of unitPicture 2: waveform when I turned the output on, and then offLikes:1.) Dedicated 3.3 and 5 volts outputs2.) Standby/operation switch for on/off output3.) I didn't see any over/under spikes when turning on and off with or without a load (picture 2)4.) It seems pretty accurate and matches the .05% specs.5.) Controls are easy to use.Dislikes:1.) The two controlled outputs are one channel, so you can't create two different voltage rails with it. (picture 1)2.) The two controlled outputs are tied together, so you also can't create a dual -/+ rail. Why would you want two outputs that are tied together? This one really bugs me since I would like to test op amps with it and not have to create a split rail. (picture 1)3.) When you switch on the output it takes around 1 second to get up to the voltage. Is this normal!? I thought Dave's latest Rigol review had a 10ms change. The output shut off takes awhile as well. (picture 2)4.) The fan is quite loudI'm thinking about sending it back due to dislikes 1-3. The Rigol Dave reviewed looks very tempting and is $100 cheaper than this PSU.Thoughts?Thanks.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: August 18, 2013, 02:14:24 am
content: Hi,I just read the datasheet for the Extech 382280. The datasheet indicates that the power supply has a single 40V 5A adjustable output.Did I miss some thing that make you think that this unit has two controlled outputs?http://www.extech.com/instruments/product.asp?catid=39&prodid=217Jay_Diddy_B

author: twjtwj
author_rank: Contributor
timestamp: August 18, 2013, 02:28:42 am
content: No, but to me it seems tying the two together seems silly. Either make them both programmable or isolated for dual supply use.
Test equipment TTL inputs/outputs - Page 1
Forum section: electronics / testgear

author: richard.cs
author_rank: Super Contributor
timestamp: August 14, 2013, 07:25:27 pm
content: I've always blindly connected "TTL level" sync and reference inputs/outputs together on sig-gens, spec-ans, etc, without thinking too much and it's always just worked. I find myself wondering how these are actually implemented.Are the 50 ohm lines terminated at each end so the receiver sees half the TX voltage? If so is the driving end "5V TTL" giving a very marginal logic level at the other end or 10V giving a good logic level into a terminated line (and potential damage at an unterminated one)? Or maybe only terminated at the TX end like VGA sync, so it can be driven with 5V and the RX sees a 5V pulse?Is there no consistent standard? Or maybe inputs are more sensitive than normal TTL so a 2.5V received pulse is fine? I really have no idea. It's never mattered to me before but now that I find myself interested in building test equipment it's a rather useful thing to know.

author: edavid
author_rank: Super Contributor
timestamp: August 14, 2013, 07:31:47 pm
content: Yes, there is no consistent standard, but an output marked TTL will not exceed TTL voltage limits even if open circuit, and an input marked TTL will have TTL-compatible thresholds, and will not exceed reasonable TTL loading.Just because it's a BNC, doesn't mean it's a real 50 ohm input or output.

author: SeanB
author_rank: Super Contributor
timestamp: August 14, 2013, 07:56:02 pm
content: TTl levels are more like 330R terminated at the transmit and receive end, and at the receive end it is capacitively coupled into an inverter biased to half the supply. Generally either a regular 7414 inverter fed from half the supply via a 330R resistor or a single transistor inverter. I have seen some using a 7474 as a receiver, with it being used to both recover a clock and a data signal from the received data.

author: richard.cs
author_rank: Super Contributor
timestamp: August 14, 2013, 08:11:04 pm
content: Useful information thanks.
Yokogowa 10m? Shunt - how much is it worth if ~1% out of tolerance ( damaged) ?  - Page 1
Forum section: electronics / testgear

author: eevblogfan
author_rank: Frequent Contributor
timestamp: August 13, 2013, 05:19:47 pm
content: HeyI found one bad unit written "Testing equipment disabled" )not sure what's the equivalent term in english ..I checked and he's out by roughly 2% , instead of 10.000m? it says 9.8XXXm? ..he will to sell it and asked me for price , I said I am going to ask my forum , so here I am , can you tell me how much can he ask for that ?thank youP.s: I really don't know where shall I post this thread , please move this thread if you fiend it necessary

author: eevblogfan
author_rank: Frequent Contributor
timestamp: August 14, 2013, 04:59:45 pm
content: Heyis it okay to leverate the thread ?I told my boss 10% of new unit , is that too much ?thanks
M3500A (PICOTEST) - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: August 14, 2013, 08:17:42 am
content: Hi,I'm new here and interested in a 6 1/2 digit multimeter, did someone use it or test it?Similar features like 34401A (Agilent) K-2000 (Keithley) 8845A (Fluke)M3500A (PICOTEST)VFD Dot Matrix, Dual Displays with 3 colors6 1/2?59 reading/sec 1PLC5 1/2?545 reading/sec 0.1PLC4 1/2?2000 reading/sec 0.02PLC100mV~1000V0.0035%+0.0005%100mV~750V0.06%+0.03%3Hz~300kHz1M?10mA/100mA/1A/3A0.05%+0.005%1A/3A0.1%+0.04%3Hz~5kHz100?~100M?0.01%+0.001% YES3Hz~300kHz0.01%RTD/TC10 channelsYESYESYESYESYES0~3600s2000 readingsUSB/GPIB(opt)/RS-232C(opt)Eurofox

author: David_AVD
author_rank: Super Contributor
timestamp: August 14, 2013, 09:12:50 am
content: I bought a model M3511A about a year ago. Haven't used it a lot yet, but seems easy to drive.

author: Unknown
author_rank: Unknown
timestamp: August 14, 2013, 09:23:07 am
content: Pretty sure these are rebadged from some other ODM (Array?). Unless it's substantially cheaper than the Agilent/Fluke/Keithley competitors, I don't see the point of buying a lesser known brand. You should be able to find a Fluke 8845 or Agilent 34401a for close to that $900 MSRP.

author: David_AVD
author_rank: Super Contributor
timestamp: August 14, 2013, 10:06:40 am
content: As a matter of interest, the 34401A goes for $1300 - $1500 new in Oz.I bought my M3510A (faster version of M3511A) for about $680 because the cal certificate was expired. Even the "fresh" ones were < $900.

author: Unknown
author_rank: Unknown
timestamp: August 14, 2013, 10:31:38 am
content: Since eurofox did not specify a location, I'm assuming US pricing. The Agilent 34401a is about US$1100 list, and the street price is substantially less. Tequipment.net currently has the Fluke 8845A on sale for US$950. In that market, the Picotech/Array/whatever M3500A does not make much sense unless you can get it for substantially under $900.

author: eurofox
author_rank: Unknown
timestamp: August 14, 2013, 10:53:21 am
content: I can get it from the local distributor (EU market) for 550 Euros VAT included and 2 years warranty + original calibration. Normal price is 100 Euros more.He claim that features a similar and provide me a comparison list with the 4 leaders producing a 6 1/2 digit multimeter, I just want to be sure that this is a good investment.Eurofox

author: Bored@Work
author_rank: Super Contributor
timestamp: August 14, 2013, 04:40:36 pm
content: Arrayhttp://www.array.sh/M3500A.htmIf I remember the story correctly, then Keithley rebranded this Array multimeter as 2100http://www.keithley.com/products/dcac/dmm/broadpurpose/?mn=2100120and people were not really happy about the 2100 firmware stability and usability. Maybe that has changed, the meter is now a few years on the market, Maybe the Picotest version has another, better firmware.But I would be careful buying one At least check the manual upfront to figure out if the usability is ok.
BNC adapters... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: August 14, 2013, 02:23:48 pm
content: Hi Everyone,I'm looking to get a toolkit of a few pass through BNC adapters I've seen mentioned here in threads. A 50 ohm terminator, some attenuators, etc. Where is a good place that has these at a reasonable price/value/quality level?Thanks,Alan

author: Unknown
author_rank: Unknown
timestamp: August 14, 2013, 02:48:57 pm
content: I would not call an attenuator or terminator an adapter. Mini-circuits have some reasonably priced attenuators. Feed-through terminators from the usual suspects like Pomona are expensive, I haven't found a cheap source yet. They occasionally turn up used on eBay. Not a whole lot that can go wrong unless someone overloaded it. Used Tek feed-through terminators (not the precision or 3W type) have better specs than new Pomona feed-through terminators (lower VSWR).

author: alank2
author_rank: Super Contributor
timestamp: August 14, 2013, 02:54:15 pm
content: alm you are totally right, they aren't adapters!

author: Sigmoid
author_rank: Frequent Contributor
timestamp: August 14, 2013, 03:24:28 pm
content: On Mouser you can get 1W 50ohm terminators for peanuts ($2), I'm thinking of getting a bunch. According to spec they are good to 4Ghz. I don't think that I'd normally want to drive a function generator above 7VRMS, so I guess 1W should be kind of enough.A tee costs maybe $4, so you have a feed-through terminator under $10.

author: Unknown
author_rank: Unknown
timestamp: August 14, 2013, 03:49:47 pm
content: The performance of a tee + standard terminator is inferior to a real feed-through terminator, though. The terminator should be as close as possible to the input. Not necessarily a problem for relatively low frequency work, but I wouldn't use it for fast signals. There's a reason why real feed-through terminators are sold and bought.

author: Sigmoid
author_rank: Frequent Contributor
timestamp: August 14, 2013, 04:38:16 pm
content: Quote from: alm on August 14, 2013, 03:49:47 pmWhere would you put the frequency threshold when the difference starts to become noticeable?

author: Unknown
author_rank: Unknown
timestamp: August 14, 2013, 10:42:05 pm
content: I would start worrying above 100 MHz or so. The Pomona feed-through adapter is specified up to 500 MHz, and the Tek one to 1 GHz. Note that a scope will still display signals somewhat beyond its bandwidth. A 100 MHz scope is -3 dB down at 100 MHz (30% attenuation), but may attenuate 200 MHz signals for example by 65%, so an additional attenuation of 200 MHz signals may still be noticeable.One signal where I would expect it to make a difference is in the Jim Williams pulse generator. This pulse has a rise time of a few hundred ps, so will have a bandwidth in excess of 1 GHz.
Agilent U1272a probes - Page 1
Forum section: electronics / testgear

author: arthur92710
author_rank: Newbie
timestamp: August 13, 2013, 06:33:23 pm
content: Hi guys, I just got my U1272a which I assumed, because of all the reviews online and product description from seller, that it comes with both the 19mm and 4mm probe tips. However I got the " U1211 - 62103 Standard Accessories Kit " which only has the 4mm tips.I contacted the seller and they will accept a return, free shipping. It's a nice meter and I don't really want to go through the hassle of sending it back and getting it from somewhere else.What would you guys do?

author: wraper
author_rank: Unknown
timestamp: August 13, 2013, 07:30:06 pm
content: Mine was with exactly the same tips. I think you will get exactly the same at other places. Don't forget that Dave got his multimeter not from a retail store.

author: casper.bang
author_rank: Frequent Contributor
timestamp: August 13, 2013, 08:00:27 pm
content: My U1272a meters also came only with the standard tip. Fine for most electronics work, but since the sleeve can't be removed, not so good for electrical work.

author: arthur92710
author_rank: Newbie
timestamp: August 13, 2013, 10:28:35 pm
content: Thanks, for the replies.I'll just get them separately.
HP 3478A OVLD 2 wire ohm test - Page 1
Forum section: electronics / testgear

author: cswilsn
author_rank: Contributor
timestamp: August 13, 2013, 10:04:24 pm
content: Hey Guys,I'm having a problem with my old volt meter...seems a few issues are starting to arise with it at once.2 wire ohm test is showing OVLD MOHM....Anyone have any idea what might be causing this? i tried a reset.Hoping its a setting, though it just started so i'm concerned....hopefully its repairable. Has anyone ever ran into this with these old meters?Thanks again in advance!CW

author: Dave
author_rank: Super Contributor
timestamp: August 13, 2013, 10:08:35 pm
content: Are your test leads, by any chance, disconnected?

author: cswilsn
author_rank: Contributor
timestamp: August 13, 2013, 10:09:03 pm
content: connected or disconnected I get the same error.

author: Dave
author_rank: Super Contributor
timestamp: August 13, 2013, 10:10:14 pm
content: And you also get that when shorting the leads?

author: cswilsn
author_rank: Contributor
timestamp: August 13, 2013, 10:13:37 pm
content: Same thing :/ No change.

author: cswilsn
author_rank: Contributor
timestamp: August 13, 2013, 10:15:59 pm
content: 4 wire seems to be OK, though I have never had to use that function before.

author: Dave
author_rank: Super Contributor
timestamp: August 13, 2013, 10:56:51 pm
content: I suggest you crack it open and start poking around with a multimeter.Hereis the service manual for this unit. You can find the troubleshooting guide for resistance measurement on page 107.

author: Unknown
author_rank: Unknown
timestamp: August 14, 2013, 01:25:10 am
content: In 2W mode the current source and voltage input should both be connected to the same terminals, so it can source the 1 mA current and measure the voltage drop. My guess is that something goes wrong in the switching of this, since this is probably the only difference between 2W and 4W mode.I'm not sure if this is switched by discrete relays/transistors or by the input switching ASIC.

author: cswilsn
author_rank: Contributor
timestamp: August 14, 2013, 05:35:23 am
content: Welp, Thank you! I fixed it.Module U102 had some mild corrosion on one of the pins, either than that the whole thing looks fine. I spent the past few hours cleaning everything just in case.The attached image is the meter with a 1/4 watt 49.9 ohm resistor...that works for me!Thanks again Dave!
looking for a tool to find audio signals - Page 1
Forum section: electronics / testgear

author: kripton2035
author_rank: Super Contributor
timestamp: August 13, 2013, 01:45:35 pm
content: hi,I'm looking for a tools if it exists, to search on connectors for audio signals.it should allow to listen to the signals (that can be weak like the output of a mike) of strong (loudspeakers)it should detect numeric (i2s - toslink) or analog signalsit can also display the waveform or the spectral analysis of the signal it detectsit can display the level and the type of the signal it finds.does such a tool exist ? (even at an insane price first it is to know what exists to do such a job)thanks.

author: SeanB
author_rank: Super Contributor
timestamp: August 13, 2013, 07:02:59 pm
content: 1 is a tone detector for a cable tracer.2 and 3 and 4 is any hand held oscilloscope.You might want to combine both in one housing, but it will be a pretty speciality instrument. The only ones I have seen that are close are the line test units used in telecoms applications for ADSL line measurements, which are capable of doing ADSL and POTS measurements on the line for fault finding and installation of the top tier lines. Not the tool the average telco linesman has, his is more of a butt for POTS and another for ADSL detection and basic measurement ( laptop and a USB ADSL modem with the junky software showing the line parameters it gets on connection) during an install. These are reserved for the top line troubleshooters.

author: kripton2035
author_rank: Super Contributor
timestamp: August 13, 2013, 07:10:49 pm
content: thanks,I already tried a "handheld" fluke scopemeter 105B I had for thatit is definitely too slow to clearly detect audio signals...I dont know if the actual handheld dso nano and so are faster than a 10 years 100MHz fluke ?I'm pretty sure they aren't !
Going to review the Fluke CNX 3000 kits - Page 1
Forum section: electronics / testgear

author: Tooms
author_rank: Unknown
timestamp: June 21, 2013, 09:14:59 pm
content: Hey guysI have got some Fluke CNX 3000 kits and is beginning to write on a review aobut them, so is there any thing that you like me to test and maybe include in the review, please let me know.Here is my blog post about getting the gear todayhttp://www.tooms.dk/Tblog/Showblog1.asp?BlogID=201306212225193474Tooms

author: ryan in louisville
author_rank: Newbie
timestamp: August 13, 2013, 01:20:00 pm
content: I would like to know about battery life. I heard from a coworker that battery life was horrible. I would like to hear your results on letting it run gathering data and see how long it lasts on a full charge.

author: Tooms
author_rank: Unknown
timestamp: August 13, 2013, 06:39:42 pm
content: HiI am alomost done with the review and hope to post it very soon, but i have tested the battery life and i dont see it using that much.I have tested logging over night some times and from what i can measure then it is only using 10.5 millwatt when the module is logging and i have now used the modules for more then one month and i have still not changed any of the betteries.Tooms
Probing random things with my scope - Page 1
Forum section: electronics / testgear

author: Stonent
author_rank: Super Contributor
timestamp: August 14, 2013, 01:47:17 am
content: I was probing around a wireless router last night and found a point that generated about a 1 inch solid strip on my scope. I kept adjusting the time until I could just barely see the wave form. Then I pulled my X5 magnification button and got two overlaying sine waves that were sort of flickering. I found about a range of 2mm or so on my trigger knob that could almost get me a clear waveform (here). Since I was having such a hard time isolating that trace, I was thinking that I might be at the limit or possibly exceeding the range of my scope (20MHz)So my brain isn't doing a very good job right now and I'm trying to figure out the frequency.I'm on .2 uS/Div and x5 magnification so that's .04uS/Div, right? From what I can tell, I'm just about getting 1 complete wave per division at this scale so what frequency does that look like to you?Also found this on the output of what I thought was a voltage regulator.What I was interested in is that it looks like a square wave but the top is 1.5 divisions and the bottom is 2 divisions. Is it more likely that the wave is being generated that way or that there's something going on with my scope? I'm at 2uS per division on this wave with no magnification. The 10K test signal on the scope is pretty much spot on. Also interesting is that this device has 12VDC going in and what I thought were pins with 5V and 8V. Turns out the 8V is really 9VAC but the cheap volt meter I was using didn't seem to care all that much.

author: c4757p
author_rank: Super Contributor
timestamp: August 14, 2013, 01:51:18 am
content: First one looks like a failure to trigger. 25 MHz (1/40ns) on a 20 MHz scope - a bit surprising, but not entirely uncommon depending on the scope, that it couldn't trigger.Edit: just under 50 MHz actually, I see almost two complete cycles per division. Less surprising now. My old 20 MHz wouldn't trigger on a 50 MHz wave either.Second probablyisthe output of a voltage "regulator" - a DC/DC converter, before it goes off to the rest of the circuit.

author: Stonent
author_rank: Super Contributor
timestamp: August 14, 2013, 01:56:15 am
content: Quote from: c4757p on August 14, 2013, 01:51:18 amYou are absolutely correct. I just now happened to find a picture of the circuit board and it was this:http://www.diodes.com/datasheets/AP1506.pdfA 1506 150KHz, 3A PWM BUCK DC/DC CONVERTER. The PWM would explain the inconsistency in the wave size.And here it is in circuit.Just like the example, a coil, schottky, some resistors and some capacitors.There is a 16MHz crystal elsewhere so maybe something is tripling the clock which would make it around 48MHz in that case?
Question about Fluke 87-III - Page 1
Forum section: electronics / testgear

author: Marionette
author_rank: Newbie
timestamp: August 13, 2013, 01:26:26 am
content: Hello,I recently purchased a Fluke 87-III from Ebay and would like to check the number of times it has been calibrated. I know for the fluke 87 V one simply holds down the min/max button while turning the device on, then press the Autohold button and the number of times the device has been calibrated is displayed.Is there any such process for the Fluke 87-III?

author: dfmischler
author_rank: Frequent Contributor
timestamp: August 13, 2013, 01:50:44 am
content: No.Here's the service manual in pdf.
Rigol "UltraView" software - Page 1
Forum section: electronics / testgear

author: iceisfun
author_rank: Regular Contributor
timestamp: August 13, 2013, 02:06:21 am
content: I am looking at the Rigol DM3058E and DS2072 multimeter and scope package, the graded large display and other features of that scope look awesome and the other DMM I am interested in is the Agilent because of its awesome reporting and statistics, but the Rigol comes with LAN support and its half the price.I want something PC controllable and know there are C++/CLR interfaces but they have a "Addon" listed for $200 for their software. Is this software a license key that unlocks part of the hardware or is it a software license that I get and can run one instance connected to all of my Rigol test gear?Also - are there any distributors that are better than others, it seems like everyone is about the same price. It would be nice to find one close to Mid-West US
Does someone have a working HP3468? - Page 1
Forum section: electronics / testgear

author: kt315
author_rank: Regular Contributor
timestamp: August 11, 2013, 03:42:26 pm
content: Hey, I am trying to troubleshoot the unit I've bought from ebay.The repair manual explicitly says that the current is supposed to be 1mA for 3k range, but does not specify it for the other ranges.If you have a working version of HP3468, can you measure and post the ohms measuring current for different ranges?I am specifically interested in the 3 lowest ranges.

author: Dave
author_rank: Super Contributor
timestamp: August 11, 2013, 04:58:27 pm
content: Just measured the currents on my 3468B.Here are the results:300ohm - 1mA3kohm - 1mA30kohm - 100uA300kohm - 10uA3Mohm - 1uA30Mohm - 100nA

author: kt315
author_rank: Regular Contributor
timestamp: August 11, 2013, 06:22:57 pm
content: Awesome, thanks a lot, Dave.Much appreciated.

author: Dave
author_rank: Super Contributor
timestamp: August 11, 2013, 07:11:09 pm
content: You are welcome.
LCR Distributive Capacitance FAIL! - Page 1
Forum section: electronics / testgear

author: calexanian
author_rank: Super Contributor
timestamp: August 13, 2013, 04:20:02 pm
content: So anybody in the audio transformer business knows the importance of determining distributive capacitance. BK Precision discontinued the 858 handheld LCR which had the outstanding feature of recognizing an inductor was connected and while measuring capacitance would read effective distributive capacitance. Really the only notable feature of the thing. Its replacement the 878 and its variants to my disappointment will not do this! I have a call into them just in the event I have a case of Op Manual Blindness but in my sorrow/pity period of having to actually calculate distributive capacitance (Not sexy in any way) I figure I would hack out a complaint here in the event somebody has a easy solution to my problem. I actually stormed ebay to purchase some used 858's so my life may continue, for a while.Net result. They got rid of the one useful novel feature and gave us a "better" meter with some fancy usb functionality and no real improvement in its performance. It is possible that distributive capacitance may be accessible via the USB/software connection, but the whole point of a hand held meter is just that. Hand held!Charles
Rigol DS1052E Firmware - Page 1
Forum section: electronics / testgear

author: Bryan
author_rank: Frequent Contributor
timestamp: August 12, 2013, 07:52:15 am
content: Where can one get the latest firmware for the DS1052E. Can't seem to find anything on the Rigol site.

author: IonizedGears
author_rank: Regular Contributor
timestamp: August 12, 2013, 08:36:44 am
content: You have to email them personally, the wankers don't do it any other way

author: wraper
author_rank: Unknown
timestamp: August 12, 2013, 08:49:41 am
content: http://www.eu.rigolna.com/applications/if you type there ds1052e then it will show up firmware update procedure, click on it.

author: Bryan
author_rank: Frequent Contributor
timestamp: August 12, 2013, 09:05:52 am
content: Thanks folks. Found the link as above, but will send a e-mail. the link doesn't say what version or anything.