hybridfree/eevblog-posts huggingface dataset:
Rigol vs SCPI: Rigol Loses? - Page 1
Forum section: electronics / testgear

author: bushmg
author_rank: Newbie
timestamp: February 13, 2016, 02:56:05 am
content: Some time ago, I bought a few Rigol instruments (DSA815, DM3068, DP832A, DS1104Z, and DG1032). I am just now getting around to learning Labview and exploring how to use the VISA drivers to control the instruments (the DM3068 meter and DP832A power supply, specifically). Everything is going great until I try to use the status registers (SBR and SESR) to synchronize stuff and none of the techniques works!I follow the NI tutorials to the letter, even use their simple example VIs. Every time I read the SBR (via *STB?) it remains zero, so any While-Loop that tests the bits (RQS, ESB, or MAV) never exit. Other basic set and read commands do work, so I can insert time delays as needed to work around the problem, but that's so inelegant!Has anyone else experienced something like this, or am I missing some piece of the puzzle?Thanks!Mike

author: Karel
author_rank: Super Contributor
timestamp: February 14, 2016, 08:51:32 am
content: Quote from: bushmg on February 13, 2016, 02:56:05 amDon't waste your time.https://www.google.com/?pws=0#pws=0&q=why+i+hate+labviewQuote from: bushmg on February 13, 2016, 02:56:05 amWelcome to the magic world called "Rigol firmware". Use the inelegant approach and insert time delays.If you have a lot of free time, document all bugs and report them to Rigol. If they don't respond, repeat sending the bugreportsevery three working days till you have received a supportticket and the name of the assigned engineer.Don't expect them to fix it speedy...
Siglent SDS1102X NI Visa error - Page 1
Forum section: electronics / testgear

author: znroot
author_rank: Contributor
timestamp: February 11, 2016, 06:29:03 am
content: Hello everyone,I have tried to drive my SDS1102X with Labview, but as now (with last firmware installed and official VISA example) I always get "timeout error" (using USB communication)Anyone with SDS1000X series tried to work with Labview?By the way also the "official" Siglent application crash on my PCThanks
Keithley 7002 Switch System Teardown - Page 1
Forum section: electronics / testgear

author: michaeliv
author_rank: Frequent Contributor
timestamp: February 09, 2016, 07:36:25 am
content: Hello.I recently got a Keithley 7002 in order to source a LCD for my Keithley 2001 -- they share the same display. A new display board from Tektronix costs $417 + Shipping + Tax where the 7002 ran me $50 + $25 shipping ( It's a heavy beast @20lbs ).The Keythley 7002 is a switching & control system designed to operate in conjunction with other test gear. It can switch DC voltage & DC current.Let's see what we get for a MSRP of $5,020HD pics available athttp://imgur.com/a/roGql/allInstrument front panel - the LEDs indicate channel status ON/OFFConstruction is good, product feels solidBack of unit, support for 10 slot cards vs only 2 in the 7001Not much inside the unit -- most is empty spacePower supplies were covered with a thin plastic sheet inside the enclosureMains routed from one side of digital board to the other( tho it would have lots of room to stay away from the digital logic ). Also board quality seems too high for what would be needed.Seems to have same components as the DC-DC converter in the Keithley 2001, but different layoutHope you enjoyed!

author: quarks
author_rank: Frequent Contributor
timestamp: February 09, 2016, 08:32:11 am
content: That looks like a bargain.Thanks for sharing
Viz WD-767 AC Watt Meter Teardown - Page 1
Forum section: electronics / testgear

author: GAD
author_rank: Regular Contributor
timestamp: February 09, 2016, 05:54:15 am
content: A few weeks back I scored an oldVector Vid Variable Isolation Transformerand have subsequently fallen in love with it. That caused me to wonder what else was out there by the same company, which has been Viz/Vid/Vector/RCA/who-knows-what-else. That's when I found this: A Viz WD-767 AC Watt Meter.They made two models, the 766A and the 767, which were 10A and 20A respectively. This is the 20A version which is rated to peak at 35A. It looked almost new in the auction ad, so I snagged it for what seemed like a reasonable price. Why? Because I have the disease, just like most of us.I love older well-built analog gear and this thing looks great sitting next to the ISO-V-AC-III, and it's even useful. Sure, A modern Kill-A-Watt will give me more info, but they don't peak to 35A!Naturally, the first thing I did was tear it apart.Not surprisingly, there's not much to it, and the big case with the little transformer made me chuckle a bit. It's almost as if they were trying to make the buyer believe there was more going on inside it than there was. But then, this is from the age when men were men and cases were made out of steel!Overall it's well-made, though there are some rather interesting solder joints where there was just too much wire to fit into the lugs. I will say that those solder joints are rock-solid, so I'm resisting the urge to re-solder them.Out of the box it was a volt or two off from all my other test gear, so after digging around online I found the manual which has the full schematics (man, I miss those days), and of course there are some pots for twiddlin' on the board. Since I have a tweaker and I'm not afraid to use it, I dug in.The board is pretty simple, and I have to say that I just love old boards that don't have surface-mount components. I'm 51, and boards like this just seem "right", uncleaned rosin and all.Of course, sometimes the engineers don't talk too closely to the fabrication guys. The thread marks in the pot are from one of the screws that holds on that steel case cover.No real harm done, though, and the pot works as advertised, as do the other two. With some balancing and some testing, I got it agreeing with my Fluke in no time. Plugging a space heater into it and simultaneously measuring with an amp clamp also showed spot-on readings.All in all I'm pretty happy with it. Is it worth the space it takes up on the bench? I dig it so the answer is "yes".
MHS-5225P Function Generator - temperature controlled fan - Page 1
Forum section: electronics / testgear

author: Robbybox
author_rank: Newbie
timestamp: February 08, 2016, 11:12:24 pm
content: Hi,I am just involved with testing my new unit MHS-5225P function generator with power amplifier version.One strange feature is the fan control. Even if power amplifier is switched OFF the temperature on top of the heat sink rises to more than 50 °C within some minutes, but the fan is not activated. As soon as I switch the PA ON the fan will be activated, even if the temperature is still down.It looks for me that the fan is never activated in normal mode, and permanently activated in PA mode ON.Can anybody confirm that behavior?Another behavior is more critical, that is, in some situations the display shows totally confused characters after pushing any button, and output rises to high values. After switching power OFF and ON again the unit works correct. Some time later that happens again. I can not say from which situation or action this arised. Anybody with similar experience?If someone need such information:I have created a placement map for the two PCB inside the box (for most important components), and concerning the fan issue I have developed a simple circuit to get a temperature controlled fan activation, look here (unfortunately in German language only):http://www.reinhardweiss.de/german/mhs-5225p-fan.htmRobbybox
Aim-TTi LD400P Programmable DC Electronic Load - Page 1
Forum section: electronics / testgear

author: Short Circuit
author_rank: Frequent Contributor
timestamp: February 11, 2016, 01:44:47 am
content: Here are some pictures of the gut of my new LD400P electronic load from Aim-TTi.This is a 80V/80A/400W load with 1-minute overload capacity of 600W.The main reason for buying this baby was it's Constant Conductivity mode.While very similar to Constant Resistance, the control method is different. This is supposed to prevent oscillations when testing with power sources that operate with current limitation. My old load (a simple TekPower / "eBay") would cause the PSU and load to oscillate, pretty similar to the behaviour described inhttps://www.eevblog.com/forum/testgear/bk8500-oscillations-in-r-and-p-mode-broken-or-bad-design/msg389066/#msg389066this thread.In addition it provides some programmability with A/B levels with can be set to alternate in specific frequency, duty cycle and slew-rate.

author: Short Circuit
author_rank: Frequent Contributor
timestamp: February 11, 2016, 02:01:57 am
content: The load is build around two SOT-227 power devices mounted on opposite sides of the heatsink tunnel.Front panel is driven with an LPC2368 controller. There is a second LPC on the I/O board in the back of the device. This seems to connect with the main CPU via an opto-isolated serial interface.I was somewhat surprised to find an ordinary linear power supply with multiple mains transformers in this device. There is no clue about the design date of this machine (PCB datecodes are 2014), but as far as I know, it hasn't been that long ago that this model replaced their previous load LD300...

author: Short Circuit
author_rank: Frequent Contributor
timestamp: February 11, 2016, 02:07:44 am
content: And finally the 'real' control board...

author: rich
author_rank: Frequent Contributor
timestamp: February 11, 2016, 02:31:37 am
content: Nicethanks for sharing. I've been considering whether to build or buy one, so it's good to see inside this TTi version.
Deskew (phase align) Voltage and Current probes - Page 1
Forum section: electronics / testgear

author: D3f1ant
author_rank: Frequent Contributor
timestamp: February 07, 2016, 08:18:33 pm
content: All the scope manufactures seem to have them in various forms, but the prices vary considerably.Keysights is around AU$810, Siglents (looking remarkably similar to keysights in function) is less than 1/2 the price at AU$370. Neither of them look like they should cost more than a few $ to build. LeCroys one at least looks like a proper product instead of a bare board.http://www.triotest.com.au/shop/keysight-options/3656-keysight-u1880a-power-measurement-deskew-fixture.htmlhttp://www.triotest.com.au/shop/siglent-options/3655-siglent-descew-board.htmlhttp://teledynelecroy.com/probes/probemodel.aspx?modelid=23&categoryid=3&mseries=426I can't see why I can't use a siglent (or any 3rd party) source to deskew my probes.What are people here using or recommend as best bang for the buck?

author: tautech
author_rank: Super Contributor
timestamp: February 07, 2016, 08:35:32 pm
content: Yes of course you can use any similar calibration fixture for the job, but be aware the stated current and voltages of these fixtures is also an accuracy/sanity check for your probes.The old Teks had a metal loop for the probe cal output that doubled as a current loop for checking current probes, some other scope cal outputs had a rated output (current) to scope GND for the same reason. However if you are confident with your setup and deskew is the only concern any capable AWG with a fast edge square wave and reasonable drive capability would serve your needs.I've got one of the Siglent deskew units that I could do measurements on if there was something you'd like but I'm away from base until next week.
Fluke 87V impossible to open - Page 1
Forum section: electronics / testgear

author: tszaboo
author_rank: Super Contributor
timestamp: February 09, 2016, 01:38:27 pm
content: This is kinda embarrassing...I just got a hold to a (used by a random young engineer, used to be working here) 87V meter, which I wanted to check for the fuse properness and the infamous GSM fix. Hovewer, I was not able to open itSo I was able to remove the 2 flathead and 3 philips screw, but then after lifting the top part, the entire PCB assmbly was moving with it, and I'm 90% sure, that is not supposed to happen. It was impossible to snap it out on the top. I was using reasonable force I think.Can anyone post an image of it halfway opened? Am I missing something?

author: Muxr
author_rank: Super Contributor
timestamp: February 09, 2016, 02:33:04 pm
content: That should be all the screws. The top part sort of clamps. You upen from the bottom (battery side). And yes the whole inner assembly will sort of float on its own.What I do is put the meter flat on its front side. And I just wiggle and lift from the back where the battery is.

author: tszaboo
author_rank: Super Contributor
timestamp: February 09, 2016, 03:27:29 pm
content: OK, so that took a bit more force than I was comfortable with...It is open now. If anyone wondering, the Fuses were OK, and the GSM patch also.Thank you.

author: saturation
author_rank: Super Contributor
timestamp: February 10, 2016, 02:52:32 pm
content: To open the 87V, after removing all those screws disconnect the 9V. You can push down on the bottom of the battery compartment, which is the top half of the case, to ease separation.
Fluke 8020A banana size? - Page 1
Forum section: electronics / testgear

author: rich
author_rank: Frequent Contributor
timestamp: February 07, 2016, 02:46:22 am
content: Does the 8020A use 4mm or 2mm banana sockets as standard for test lead connection?I've owned one for over 15 years which is fully rebranded with the logo of a telecoms corporation and uses 2mm sockets. So I'm wondering if that was the norm back then or if it was a customisation for the rebadged version.If anyone is interested, the pcb has Fluke logo and marked © 1979, RevP 802XA-3001.Thanks
UnionTest UDGxxxx generators (Siglent SDG5xxxx) - Page 1
Forum section: electronics / testgear

author: Siri
author_rank: Contributor
timestamp: May 18, 2015, 02:59:33 pm
content: On the Russian market (and possibly elsewhere) comes a line ofSiglentsignal generatorsunder the brandUnionTestBelow I suggest the owners of generatorsUnionTestto discuss questions with regards to these versions of generators.My first message is a warning to owners of Russian version of the signal generators under the brandUnionTestto update the factory firmware (in Russian)

author: Siri
author_rank: Contributor
timestamp: January 26, 2016, 12:55:31 pm
content: Anyone tried to install new firmware on UnionTest UDGxxxx?

author: pascal_sweden
author_rank: Super Contributor
timestamp: January 27, 2016, 08:34:09 am
content: Isn't the brand Siglent available itself on the Russian market?If so, what's the point of buying an OEM branded Siglent instead of a genuine Siglent?The only thing which I can come up with is price.But I don't expect because of looks and design, as typically the OEM branded versions have ugly colors.I guess it's the same with the UnionTestMy suggestion is to always go for the original manufacturer. Better warranty process. Better support. Better looks

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: January 27, 2016, 03:16:48 pm
content: Quote from: pascal_sweden on January 27, 2016, 08:34:09 amSiglent seems to have a support center in Russia but that doesn't necessarily mean the warranty processes are better.Same with support. Even in the west Siglent's support efforts aren't exactly stellar, and in some cases so bad that it would be difficult for someone to offer something worse.Even more, and contrary to what you say, warranty and product support of some of its OEM customers (like LeCroy) are actually significantly better than with Siglent itself.QuoteI guess you have never seen a LeCroy WaveAce (a rebadged Siglent SDS1000 scope) or WaveStation (rebadged Siglent SDG1000 and SDG5000 generators) then

author: pascal_sweden
author_rank: Super Contributor
timestamp: January 28, 2016, 08:23:42 pm
content: I was refering to rebadging in Russia and local support in RussiaI know about LeCroy. But not all people like black test gear. Some people might like it.Personal taste I guess.Hard to imagine that a local Russian brand can provide better support than Siglent.Of course LeCroy will provide better support than Siglent. That's not questioned whatsoever

author: Siri
author_rank: Contributor
timestamp: February 06, 2016, 02:31:38 pm
content: Bad news. The generator SDG5162 output sine signal has a dirty spectrum (large phase noise), and error in the output signal level. level setting error progresses with increasing frequency and reaches 2dB(!), there is poor quality inside switchable attenuator.Those who chooses a laboratory generator I do not recommend to choose SIGLENT equipment. Bad parameters and bad customer support, which is not responding.
Unlocking Agilent U1732C/U1733C LCR meter features on cheaper U1731C - Page 1
Forum section: electronics / testgear

author: ArcticGeek
author_rank: Regular Contributor
timestamp: February 06, 2016, 04:56:03 am
content: I had seen some time ago that a few people were able to somewhat "unlock" some of the features on the higher end Agilent LCR meters by modifying the serial EEPROM, as seen in this thread:https://www.eevblog.com/forum/projects/agilent-u1241a-to-u1242a-hack/msg203666/#msg203666I'm curious, did anybody ever have any real success in doing this? According to the posts in the above topic it seems that people were having some difficulties getting the higher 10Khz and 100Khz modes working properly.I have a U1731C that I purchase recently, and I'm quite happy with it. I use it mostly for measuring ESR of electrolytic caps, so the limitation of the 1khz doesn't really bother me.But I would like to enable the LED backlight on my U1731C, that model doesn't have one. I have a feeling that it is simply a software enable feature, as the LCD displays between all 3 models look identical. Even though the Keysight part number is different between all 3 models according to their parts website, I find it hard to believe that Agilent really has 3 different part numbers for it. It makes more sense to me that they have simply disabled it in code. If I press and hold the key that is supposed to be the backlight key it just beeps twice; indicating that you have pressed a wrong key.Has anyone tried to "upgrade" their U1731C to the higher end models? Did it work? Does the backlight work?
A nice find@home - Leader LBO 524 - Page 1
Forum section: electronics / testgear

author: Turbon
author_rank: Regular Contributor
timestamp: February 05, 2016, 02:24:14 pm
content: Hi.I have had this Leader since it was new in the -80'es. It was bought to an business of mine at the time and was never used much (at most a 1000h until today).It has come to use once in a while since then but the last 5 years or so it began to be very picky about the vertical position, chA showed >+10% to little and x10 on chA wasn't usable - totally unreliable - the line just bouncing. I have thought of scrapping it more than a few times. So today as I gave it time I noticed that the protective plastic film has started to wear of in the cornersshows how much maintenance and care this have got in the past. Well I opened it and found some light dust inside but no spider web. Brushed it of and it looks as new inside. The voltage tongues for choosing the volt/div was quite blackish so I presume they have silver plating. I used isopropyl alcohol on an earstick (is this the word?) to clean them. Then I jogged about everything for an hour and the scope is much better now. I plan to jog it a bit every day now for a week or two just to wear of the oxides that probably made it untrusty.After that it is time for calibration and maybe replacement of some electrolytes - it is over 30years old even if it is hardly used.I would welcome any leads on how to better itRegards

author: Brumby
author_rank: Unknown
timestamp: February 05, 2016, 02:29:07 pm
content: Quote from: Turbon on February 05, 2016, 02:24:14 pmQ-tipCotton tipCotton bud... these are some I've heard - but there's probably others.Good luck with the scope.
Rigol MSO/DS1000Z: new User Guide & new Programming Guide - Page 1
Forum section: electronics / testgear

author: Karel
author_rank: Super Contributor
timestamp: February 06, 2016, 08:27:42 am
content: For the Rigol MSO/DS1000Z fans, a new user guide:http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-050a/1/-/-/-/-/MSO1000Z%26DS1000Z_UserGuide.pdfAnd for those with programming skills, a new programming guide:http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-0386/1/-/-/-/-/DS1000Z_Programming%20Guide_EN.pdfBoth are dated December 2015.

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 06, 2016, 02:10:36 pm
content: thanks. there are new update on WAV:DATA? section, more detailed explanation on how to read multiple blocks memory. but i already code that last night by using imagination, glad that i coded correctly. but the interleaving channel data issue inhttps://www.eevblog.com/forum/testgear/rigol-ds1000z-series-(ds1054z-ds1074z-ds1104z-and-s-models)-bugswish-list/msg861267/#msg861267is not addressed...

author: Karel
author_rank: Super Contributor
timestamp: February 06, 2016, 02:25:20 pm
content: Quote from: Mechatrommer on February 06, 2016, 02:10:36 pmWhat needs to be addressed exactly?DSRemote still works correctly with the latest firmware and downloads the deep memory waveform data as describedin Rigol's programming guide.

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 06, 2016, 02:31:27 pm
content: Quote from: Karel on February 06, 2016, 02:25:20 pmthat... if you activate more than 1 channel, you'll get spaghetti arrangement data. and this guide is how to handle this and that etc etc..

author: Karel
author_rank: Super Contributor
timestamp: February 06, 2016, 02:51:16 pm
content: Quote from: Mechatrommer on February 06, 2016, 02:31:27 pmTry DSRemote with multiple channels activated. It doesn't produce spaghetti.
Low cost multimeter with Limit Testing? (Easy reading for handicapped people) - Page 1
Forum section: electronics / testgear

author: HighVoltage
author_rank: Super Contributor
timestamp: February 04, 2016, 10:38:33 am
content: I am looking for a low cost multimeter to measure simple resistance with "Limit Testing"Similar to what the Siglent SDM3055A is offeringLike a red screen when the values are outside the limits.This is to be used for handicapped people, measuring something like 7 kOhm +/- 12%The Siglent would work but it is a little high on the price for this purpose.5 1/2 digit is also not requiredIs there a lower cost multimeter that works similar to the Siglent limit testing?Is there may be a low cost handheld meter with limit testing?Thanks for some ideas.

author: rrinker
author_rank: Super Contributor
timestamp: February 04, 2016, 01:38:56 pm
content: For something specialized like this, perhaps the best option would be to make your own test rig specifically tuned to report the results.You can probably find a low cost meter with a large display, but then it won't have the limit testing. If it's always for 7K, it's not a very complex circuit that can light up a large LED for pass or fail.I've been meaning to build one myself for my model railroad - for block detection I put 10K 603 resistors across the wheels. I've just been testing them by clipping my multimeter leads to a piece of track, but all I really need is a circuit to light a green LED (I'm not colorblind, so red for fail and green for good works - but obviously something else can be used to account for a potential inability to distinguish red and green) if it's close enough to 10K so I can do simple pass/fail testing.

author: Fungus
author_rank: Super Contributor
timestamp: February 04, 2016, 02:34:26 pm
content: I would build a test rig using an Arduino.Use a simple resistor divider with another resistor that matches the one you're testing. Measure the center point, the Arduino should read a value of 511 or 512 if the resistor you're testing matches the reference resistor (it's a ten bit ADC so it reads from 0 to 1023).Put a couple of crocodile clips to hold the reference resistor - make it easy to change.A 10-bit ADC can measure with 0.2% accuracy - plenty for +/- 12% limit testing.Go through your batch of resistors and pick out the best ones to use as references, or spend a bit more on those and get high tolerance ones.
ProTek B4004 / MasTech MS8040 DMM PC Link - Page 1
Forum section: electronics / testgear

author: teamSMITHusa
author_rank: Contributor
timestamp: February 03, 2016, 11:58:46 pm
content: Hi everyone:This is a long shot... but...Anyone know if there is an upgrade to the ProTek B4004 PCLink Software?I have the Protek B4004 Benchtop DMM, which is a clone and identical to the MasTech MS8040 (the Protek B4004 actually came with software marked for the MS8040 and worked).The PC Link software works great on my old Windows XP PC...But i recently pulled the XP machine off the bench and replaced it with a Windows 7 (64bit) machine... and as i expected, the old PC Link software installs, but won't execute or run.Windows 7 reports 'COMDLG32.OCX' is invalid or missing.Before i spend time troubleshooting (or buying a new benchtop DMM)... Just wanted to see if anyone has overcome this or can point me in the right direction.Thanks again!
Fluke 11x Series Multimeter Recall - Page 1
Forum section: electronics / testgear

author: casinada
author_rank: Frequent Contributor
timestamp: February 03, 2016, 05:12:13 pm
content: This is not new but I haven't seen it on the forum.http://en-us.fluke.com/customer-service/safety-notices/Fluke-11X-DMM-Recall.htmlDevices with problems:Device From S/N To S/NFluke 113 26290681 26290790 United StatesFluke 114 26500991 26530006 Hong KongFluke 115 26370001 26530012 China, KoreaFluke 116 26290376 26522340 North America, China, Hong KongFluke 117 26380001 26522700 China, Korea

author: ve7xen
author_rank: Super Contributor
timestamp: February 03, 2016, 09:21:20 pm
content: Is the reason for the recall known? Seems kind of silly to post a safety recall without an explanation of the problem so the user can make a sane risk assessment...

author: Monkeh
author_rank: Super Contributor
timestamp: February 03, 2016, 09:24:38 pm
content: Quote from: ve7xen on February 03, 2016, 09:21:20 pmThe piezo can fall apart.
Analog Discovery 2 vs. Saleae Logic  - Page 1
Forum section: electronics / testgear

author: ECEdesign
author_rank: Regular Contributor
timestamp: February 03, 2016, 06:04:08 pm
content: I am trying to figure which is a better deal the Saleae Logic 8 or the new Analog Discovery 2. I would probably get the National Instruments edition with Multisim.I have heard the software on the Saleae is good but it lacks some triggering functions. Not sure how the software is in the new Analog Discovery 2.I am mostly using this device for a LA as I will be using an Agilent scope for analog debugging. The analog discovery could be nice for quick jobs not at the bench though since its so small.Anyway wondered what people thought.

author: jaxbird
author_rank: Frequent Contributor
timestamp: February 03, 2016, 06:24:21 pm
content: The Saleae Logic 8 is a good logic analyzer, the Analog Discovery is like a Swiss army knife of electronic measurements.The Analog Discovery Waveforms 2015 is good, but I cannot say I have used it that much as logic analyzer, I do believe the logic levels are locked on AD, and configurable on the Saleae. That would probably be the deciding factor for a logic analyzer.

author: tggzzz
author_rank: Super Contributor
timestamp: February 03, 2016, 06:38:40 pm
content: Download the Waveforms software and try it.Define your "use cases" and then evaluate both devices using their data sheets.
Agilent 70843 12Gbit/s error performance analyzer - Page 1
Forum section: electronics / testgear

author: jopki
author_rank: Newbie
timestamp: February 03, 2016, 02:09:49 am
content: Hello,... just acquired this older pattern gen /error detector box and it looks in decent shape - it may actually be working... does seem to detect ext clock at least and provide subrate out... wondered if someone has tinkered with 70843a 70843b a bit. Unfortunately it came without the top display/clock unit... wondered if one can perform at least minimum testing (chosing a pattern / sending it out /detecting it back) with some creative interfacing / programming via the back connectors (2x HP MSIB in and out, and GPIB)Any leads, references would be appreciated.Thank you!je
Bitscope usb logic analyzer opinion or anything else - Page 1
Forum section: electronics / testgear

author: leftek
author_rank: Regular Contributor
timestamp: February 01, 2016, 02:28:51 pm
content: Hello,I would like to buy a usb logic analyzer. I have see the BITSCOPE BS05U.Have anyone owner opinion about this logic analyzer?What about compared with IKALOGIC?
Help choosing a coax cables for experimentation purposes. - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: February 01, 2016, 09:20:33 pm
content: Hello,I have watched a couple of videos showing voltage pules traveling through transmission lines in action. The folks making the videos always use a coaxial cable to demonstrate what they are talking about.Just for fun I would like to replicate some of those experiments but I am not sure what cables to buy. On my equipment I currently use small Pomona cables (http://www.pomonaelectronics.com/pdf/d2249_103.pdf) primarily because that's what my local electronics store had at hand when I needed them. The problem is that those cables are very expensive and I need at least 100 feet cable length to be able to comfortably replicate some of the experiments with the equipment I have.So my question is, what cables would you guys recommend to get that can be used for experimentation purposes? My signal generator has a 50 ohms impedance with BNC connectors by the way (also, I don't the equipment to crimp BNC connectors to bare cable). I would like something cheap but not too cheap that it can’t be used for something else later.Thanks.

author: TimFox
author_rank: Super Contributor
timestamp: February 01, 2016, 09:31:32 pm
content: Here is a moderately-priced BNC plug for RG-58/U cable that solders the pin and clamps the shield.No crimp tool needed.http://www.digikey.com/product-detail/en/31-2-RFX/ARFX1119-ND/100545The "RFX" series from Amphenol is a commercial-grade (non mil-spec) economy series.
Sorry, nothing here - Page 1
Forum section: electronics / testgear

author: Turbon
author_rank: Regular Contributor
timestamp: February 01, 2016, 03:43:43 pm
content: No worries go on...Regards

author: German_EE
author_rank: Super Contributor
timestamp: February 01, 2016, 08:28:53 pm
content: You're right, I can't see anything here either

author: Len
author_rank: Frequent Contributor
timestamp: February 01, 2016, 09:05:51 pm
content: Yes there is! There's a ... oh, sorry, it was a smudge on my screen.
Rigol ds1054z or ds1074z? - Page 1
Forum section: electronics / testgear

author: lmester
author_rank: Regular Contributor
timestamp: November 25, 2015, 11:04:16 pm
content: I noticed on Tequipment that there is a black friday deal on the ds1074z for $399.With the eevblog discount I can get a ds1054z for $356. Checking on the Rigol site it looks like these are identical except for bandwidth. After some research on here it seems that an unlock code can be applied to Rigol equipment. If the ds1054z can be unlocked for >70MHz I think it would be the better deal.Can anyone verify that the unlock works with a recently purchased ds1054z? If so, I'll get the ds1054z and save $43.I've used only analog scopes for about 30 years. Recently a friend let me borrow his DSO. I didn't want to give it back! The DSO handles the weak points of an analog scope very well.

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 26, 2015, 12:24:41 am
content: Quote from: lmester on November 25, 2015, 11:04:16 pmYes, you can still enable all options and hack the bandwidth to 100MHz.

author: time4life
author_rank: Newbie
timestamp: January 31, 2016, 09:11:45 pm
content: Quote from: crispy_tofu on November 26, 2015, 12:24:41 amI was curious about something as a potential future owner of a DS1054Z. Is the hack reversable? Maybe it might be necessary if you were doing a warranty claim on the scope.

author: ElectricGuy
author_rank: Regular Contributor
timestamp: January 31, 2016, 09:13:03 pm
content: Quote from: time4life on January 31, 2016, 09:11:45 pmYes!
Lab Room temperature - Page 1
Forum section: electronics / testgear

author: teamSMITHusa
author_rank: Contributor
timestamp: February 04, 2016, 08:04:10 am
content: Hi everyone!Quick question concerning test equipment...Is my digital oscilloscope and/or bench top dmm in danger in a mildly unstable room temperature?My basic lab is in my garage. Since I'm in silicon valley California... My garage (lab) varies in temperature each day from day to night.During the day its typically 70°F. At night the temperature gradually falls typically to 55°F.The most extreme (perhaps a few weeks a year) it could be 70°F in the day and 40°F at night (winter) and 90°F during the day and 65°F at night (summer).This, of course, is over about a 12 hour gradual cycle back and forth daily.However, it is never damp in there. Nice and dry year around.Will this kill calibration over time?Perhaps kill calibration immediately?Ruin my equipment over time?I know Dave's lab used to be in his garage several years ago... But I have no idea what the weather is like there.Thanks.

author: billfernandez
author_rank: Regular Contributor
timestamp: February 04, 2016, 09:13:54 am
content: I used to live in Sunnyvale, so I know what the temperature ranges are in Silicon Valley. Speaking very broadly:The temperature range the instruments will experience in your garage will not harm them. Temperature cycles like that may potentially accelerate the "aging" of your instruments, and thus their calibration drift, but you probably won't notice unless you're making precision measurements near the limits of your instruments' abilities.However, your instruments (and the circuitry you are working on) will all behave a little differently at different temperatures, and depending upon what you're doing and how precise you need conditions to be, especially if you are doing precise work or are logging measurements over time, you can see noticeable differences in the behavior of your circuits and the readings of your instruments.Your instruments will usually be at their best when they and your garage have been at a stable temperature in the neighborhood of 70 degrees F for a few hours.Humidity can also make a difference, again depending on what you're doing. (And I know it rains in Silicon Valley!)
Seek  combination TEquipment (Logic Analyzer, Scope. etc) - Page 1
Forum section: electronics / testgear

author: TAMHAN
author_rank: Frequent Contributor
timestamp: January 31, 2016, 06:13:31 pm
content: Hello Folks,sorry for being so silent - life has me bogged down with the menial tasks and loads of contracts.Basically, I need to spend a lot more time in a second lab (family issues)...where place is very constrained. I now wanted to ask if anyone of you can recommend something for me as a "main squeeze" type of unit. My wish list:x) DSO, minimum sample rate of 200MS. Protocol decoding is not necessary, as I will buy another Salae for that.x) AWGif possible: x) Precision multimeterIf possible, devices should be LARGE and LOUD. I dislike the little 250 or 1000g units (Rigol, Tek 200, etc). Price range should be beyond 1k or so...and yes, I gladly buy used.So, let's get the war started
What's the latest Rigol 1054z firmware revision? - Page 1
Forum section: electronics / testgear

author: LektroiD
author_rank: Frequent Contributor
timestamp: January 30, 2016, 07:46:03 pm
content: ...and where can I download it?

author: Mechatrommer
author_rank: Super Contributor
timestamp: January 30, 2016, 07:50:07 pm
content: 00.04.03.02.03andhttp://beyondmeasure.rigoltech.com/acton/fs/blocks/showLandingPage/a/1579/p/p-0019/t/page/fm/0write that down somewhere, you may want to go there again far future from now...

author: nrxnrx
author_rank: Unknown
timestamp: January 30, 2016, 08:10:27 pm
content: http://int.rigol.com/Product/Index/4I found this url just recently, so I don't know how often they update the page, but on the right sidebar is a link to the latest firmware.If you manage to translate the (horribly vague, among other faults) changelog and decide you can live without the latest firmware, may I suggest you installhttps://hamsterpower.org/f/rigolfw/4_03SP1.zip. SP2 seems to slow the UI for at least some units and doesn't bring any important fixes or features.4.03SP2 is what 00.04.03.02.03 shows in the info window on the scope.

author: Stupid Beard
author_rank: Regular Contributor
timestamp: January 30, 2016, 09:35:09 pm
content: FWIW, I have spent today regretting updating to the latest firmware and wishing that I had a second scope. It was never the fastest scope in the world, but with the latest update It'sexcruciatingly annoyingto use it's so damn slow. It also won't let you downgrade after you've installed the latest version.Hopefully they fix it soon.

author: Mechatrommer
author_rank: Super Contributor
timestamp: January 30, 2016, 10:23:34 pm
content: yeah i noticed too the respond is slower than the older version, but at least i havent experience any brick so far..

author: bitseeker
author_rank: Super Contributor
timestamp: January 30, 2016, 11:42:36 pm
content: Yep, I've stayed on 4.03SP1. Unless you need a specific fix from SP2, better to stay on SP1 for now.

author: LektroiD
author_rank: Frequent Contributor
timestamp: January 31, 2016, 12:25:19 am
content: I have 4.03 SP1 installed. I'll leave it there.Thanks for the heads up regarding the SP2 update/downgrade
HP Agilent 8642B Signal Generator - A12 Error - Page 1
Forum section: electronics / testgear

author: Mark666
author_rank: Contributor
timestamp: January 26, 2016, 07:21:16 pm
content: I have just purchase a faulty HP Agilent 8642B from fleabay for the princely sum of £100.The generator according to the sellers photos is showing an error message, A12 out of lock error.Does anyone know that if this is a relatively easy fix or have I spend my money on a source of spare components (nice vintage through stuff). Will the generator be usable even though there is an error?Looking at teardowns it is a very advance piece of kit and very complex to disassemble.Any replies will be gratefully received.Thanks, Mark.

author: tautech
author_rank: Super Contributor
timestamp: January 27, 2016, 07:33:44 am
content: Here's a thread on them:https://www.eevblog.com/forum/testgear/teardown-hp-8642b/Manuals link:http://www.ko4bb.com/manuals/index.php?dir=HP_Agilent/HP_8642_Synthesized_Signal_GeneratorSorry that's all the help I am.

author: MadTux
author_rank: Frequent Contributor
timestamp: January 28, 2016, 01:00:06 am
content: Out of lock => some part of some of several PLLs inside the unit is probably not working correctly. Which means that the output either isn't there at all or the frequency isn't very accurate or shifts around. Which makes the unit not very usable, unless repaired.So you need a working frequency counter or (better and) a spectrum analyzer or you cant probe the output and the signals inside. Then you will have a good chance of repairing it, unless some special HP part is toast.

author: KE5FX
author_rank: Super Contributor
timestamp: January 28, 2016, 01:13:18 am
content: I don't have the manuals handy but it's possible you've got a bad varactor diode. They ran them at relatively high voltages (40V or so) in the 8642B, and I had to replace one in mine when I first got it.If so, it will be challenging to repair without a lot of work. (I think I bought the last varactor Agilent had in stock, in fact.) Better to look for a parts unit to serve as a module-swapping donor.

author: Mark666
author_rank: Contributor
timestamp: January 29, 2016, 06:13:40 pm
content: Received the unit earlier today, weights 40 kg boxed. I'm surprised that the seller only charged me just over £6 for the delivery.I do not have access to a spectrum analyzer but have an Escort 3Ghz counter. I will check the output over the weekend as I need to make a space to put it on.Thanks guys for the links and info especially the info on the varactor diode. Locating the correct module shouldn't be so difficult with the service manuals. Locating a suitable varactor might be a challenge or an impossibility. Buying another unit is out of the question as these usually make a lot of money even in non-functioning order.It would be such a shame to dismantle it for spares as these must of cost a small fortune to buy new.Thanks,Mark.
34401A to PC via Serial to USB with Keysight's DMM Connectivity Utility? - Page 1
Forum section: electronics / testgear

author: SH357
author_rank: Newbie
timestamp: January 29, 2016, 07:56:03 pm
content: Just picked up a 35501A and am searching for a cheap way to record and graph data on a pc. I'm looking at high res so speed isn't an issue, I was wondering if anyone has successfully used a serial to USB cable to talk to Keysight's DMM Connectivity Utility. I know there are several GPIB to USB converters available but if a $10 cable meets my needs so much the better.Thanks!

author: Deni
author_rank: Regular Contributor
timestamp: January 29, 2016, 08:06:36 pm
content: Yes, I use three different types and all work OK. Wrote my own VISA application for some mesurements and evertyhing works nice...

author: LaurentR
author_rank: Frequent Contributor
timestamp: January 29, 2016, 08:53:13 pm
content: Because of the old school flow control on the 34401A, I had all kinds of problems with Matlab, and occasional issues with BenchVue.https://www.eevblog.com/forum/testgear/34401a-through-rs232-with-matlab/msg595074/

author: SH357
author_rank: Newbie
timestamp: January 30, 2016, 12:48:22 am
content: Thanks!

author: lukaq
author_rank: Regular Contributor
timestamp: January 30, 2016, 06:03:18 pm
content: I would use older agilent SW, almost the same as Benchview, but unlimited record time

author: plesa
author_rank: Frequent Contributor
timestamp: January 30, 2016, 07:20:43 pm
content: You maybe can apply for Free BenchVue DMM Pro.https://www.keysight.com/main/editorial.jspx?cc=GB&lc=eng&ckey=2620987&id=2620987&cmpid=1-7025931885Check threadhttps://www.eevblog.com/forum/testgear/free-benchvue-dmmfgdaq-pro/It has similar functionality like Agilent DMM connectivity utility.http://www.keysight.com/en/pd-2307503/digital-multimeter-dmm-connectivity-utility-softwareI can confirm that 34401A is working with both, you needs to add in connection Expert the device.I can highly recommend using RPI2 for logging purposes with Python.
Fluke 187 MOV type - Page 1
Forum section: electronics / testgear

author: Kuzmenkovvladislav
author_rank: Newbie
timestamp: January 28, 2016, 08:58:19 am
content: Hi everyone!Got some damaged Fluke 187 (Overvoltage burned MOV and resistor). Does anyone know, what kind of MOV they use in this DMM (looking something for replacement)?

author: retiredcaps
author_rank: Super Contributor
timestamp: January 28, 2016, 06:23:38 pm
content: If they are blue colored like the ones in these threads, alternatives have been suggested. Getting the exact one in the same dimensions seems like a Fluke only specially made part.https://www.eevblog.com/forum/testgear/fixing-a-fluke-87v/https://www.eevblog.com/forum/repair/fluke-289-repair/Fluke has used the same MOVs for a while now in their handheld and bench meters.
Evaluating harmonics using the fluke 123 and fluke view - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: January 28, 2016, 08:51:56 am
content: For those who need to evaluate harmonics using a fluke 123http://en-us.fluke.com/community/fluke-news-plus/research/evaluating-harmonics.htmlR_G_B
Disadvantages of A minus B probing of mains-powered devices? - Page 1
Forum section: electronics / testgear

author: calzap
author_rank: Frequent Contributor
timestamp: January 26, 2016, 06:53:58 pm
content: I have an oscilloscope probe isolator, but am curious about the alternative of using A minus B probing of mains powered devices. My understanding that it's safe but has two down sides: 1. two channels must be used for a single measurement, and 2. ability to see voltage differences that are much smaller than phase-to-phase or phase-to-ground/neutral voltage is poor. I've read Tektronix's Floating Measurement and Isolated Input article, which every scope user should read.Am I missing something?Mike in California

author: tautech
author_rank: Super Contributor
timestamp: January 27, 2016, 07:26:14 am
content: Quote from: calzap on January 26, 2016, 06:53:58 pmWhat exactly is that?QuoteWhat exactly are you trying to measure and why?

author: Performa01
author_rank: Super Contributor
timestamp: January 27, 2016, 03:02:10 pm
content: The main concern is common mode rejection.Common mode rejection is required, so that we actually see the difference between channels only and the difference signal is not affected by the common mode voltage between each channel and oscilloscope ground, especially if it is not pure DC, i.e. contains a considerable AC component like mains hum or even HF switching noise.First of all, both channel gains have to be made exactly equal, which used to be easy with analog scopes that have a continuous adjustable vernier for the vertical gain, but could be a problem on digital scopes, where even the fine adjust is in discrete steps, which limits the ability to precisely balance the inputs. Furthermore, there might be DSOs that don't even have a fine adjust at all.Next problem is the frequency response, which usually differs slightly between channels. So even if you manage to get a perfect balance (hence a very good common mode rejection) for DC, this will considerably degrade at higher frequencies.

author: calzap
author_rank: Frequent Contributor
timestamp: January 27, 2016, 03:23:24 pm
content: Quote from: tautech on January 27, 2016, 07:26:14 amProbe isolator is a Tektronix A6902B. I'm interested in looking at flyback and transients when mains equipment is depowered.Mike in California

author: tautech
author_rank: Super Contributor
timestamp: January 27, 2016, 07:09:55 pm
content: Quote from: calzap on January 27, 2016, 03:23:24 pmI now understand your concerns, as the Tek isolator has only a 20 MHz BW thatmaynot be fast enough to see the transients you seek.However it looks a nice piece of kit and it is possible it will do the job for you.Here's the manual for those interested:http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%20A6902B%20Operator.pdf