hybridfree/eevblog-posts huggingface dataset:
Looking for software for Tektronix TLA-510 logic analyzer - Page 1
Forum section: electronics / testgear

author: michaelengel
author_rank: Newbie
timestamp: January 01, 2016, 01:25:22 pm
content: Hi (and happy New Year!),I am about to obtain a Tektronix TLA-510 logic analyzer - however, without any software provided on 3.5" floppies and the state of the (SCSI) hard disk is unknown.From what I found out so far, this logic analyzer runs some sort of Unix (probably a Tek System V port, running on a 68EC030 with custom MMU...) and the OS can be restored to disk from a set of floppies that was provided with the LA. Unfortunately, Tektronix does not provide support for this old device any longer - but, at least, user and service manuals are available from their site.So, I'm looking for a set of install disks or some hint where one might be able to obtain these. I'm grateful for any hints.-- Michael

author: nctnico
author_rank: Super Contributor
timestamp: January 01, 2016, 03:20:02 pm
content: I strongly recommend to get a Tektronix TLA700 series!.AFAIK the software for the TLA510 is the same that runs on a DAS9200. I have some 5.25" installations disks but I have no idea if they are OK. I used to own a DAS9200 but I delivered the 3.5" installations disks with it without making copies.
Flir one for iPhone 5/5S on sale at tEquiptment.net - Page 1
Forum section: electronics / testgear

author: Scottjd
author_rank: Frequent Contributor
timestamp: January 01, 2016, 03:45:41 am
content: I missed the $99 Black Friday sale, so I was glad to see they have this one on sale again.http://www.tequipment.net/FLIR/ONE/Building-and-Industrial-Thermal-Imagers/?v=0I'll be using it wil an iPod touch 6th gen same processors as the iPhone 5s and hope it works since the other models are sold out of stock everywhere and I didn't really want to lay $250.Plus this one can be modded to work on a iPhone 6/6S. Search and you will find a YouTube video.Their are trade offs, like auto cal shutter. But this also have a much longer battery life for walking properties when looking for insulation leaks.I just thought I would share.Happy new year to all.
Agilent 34405A USB connection - Page 1
Forum section: electronics / testgear

author: TonP
author_rank: Newbie
timestamp: September 04, 2015, 05:55:27 pm
content: Try to do a Firmware update or connect a Agilent 34405A to Benchvue but without succes.After trying 4 different computers ("try an older model pc, adviced on the Keysight forum")Did I need a Windows XP machine? Somebody solve this problem allready?

author: babysitter
author_rank: Frequent Contributor
timestamp: September 04, 2015, 07:33:08 pm
content: Hi Ton,have one at work, this device is a PITA. Unreliable USB for several years, crashing during a recommended update, a failure got USB cable getting hotter than reasonably possible(USB limit 5W, right?), 4th device exchange in IDK, 5 years?Throw it as far as you can. Sell it, get something nice.

author: HighVoltage
author_rank: Super Contributor
timestamp: September 07, 2015, 07:23:44 pm
content: The Agilent 34405A is NOT an Agilent development.I also had one before and did not like it at all and got rid of it.

author: Thomas
author_rank: Regular Contributor
timestamp: September 08, 2015, 07:14:27 pm
content: I've had issues with mine too, unreliable USB.But after the latest firmware, it seems to be cured. The update took a few tries before it went without an error message.The first update (years ago) messed up the serial number, but I don't careSo my tip would be to keep trying to update the firmware. I had the Keysight IO Libraries Suite installed when I did this, not sure if that matters.I tried several times before it suddenly worked, for no apparent reason.

author: TonP
author_rank: Newbie
timestamp: September 22, 2015, 05:40:28 pm
content: I fix the problem. Luckely i dont trow al my old XP machines away.Dont ask me how I did it. I dont know but it works fine now. Also with Benchview, no problems at all.

author: KrzysiekG
author_rank: Newbie
timestamp: December 30, 2015, 10:42:40 pm
content: Do you encounter a problem during upgrade your multimeter like this:http://www.keysight.com/owc_discussions/thread.jspa?messageID=117849I asked Agilent but they were unable to explained me why my multimeter won't start upgrading...
Free 16M Memory upgrade for Agilent 335XXB and 336XXA frequency generators - Page 1
Forum section: electronics / testgear

author: plesa
author_rank: Frequent Contributor
timestamp: November 08, 2015, 08:40:26 am
content: Running promo for 16M memory upgrade of 33511B, 33512B, 33521B, 33522B, 33611A, 33612A, 33621A, 33622A in Europehttps://www.keysight.com/main/editorial.jspx?cc=AE&lc=eng&ckey=2496226&id=2496226For newly purchased/registered instruments only in EMEA.

author: HighVoltage
author_rank: Super Contributor
timestamp: November 21, 2015, 04:22:58 pm
content: Thank you, I just requested the free 16 MB memory upgrade on my 33522B

author: HighVoltage
author_rank: Super Contributor
timestamp: December 30, 2015, 09:42:32 am
content: I just got my certificate for the 16MB memory upgrade for my 33522B from Keysight.What a nice present to the end of the year.Thanks Plesa!

author: jpb
author_rank: Super Contributor
timestamp: December 30, 2015, 10:45:00 am
content: Sorry, I've probably skewed the pole. I have a 33522A not the B. It came with the 16M as I bought it from the Keysight ebay store.

author: plesa
author_rank: Frequent Contributor
timestamp: December 30, 2015, 10:54:57 am
content: Good to know that at least someone received licence. I will try to wait more weeks.
HP7044A x-y recorder replacement - Page 1
Forum section: electronics / testgear

author: jquinn11733
author_rank: Contributor
timestamp: December 30, 2015, 08:46:41 pm
content: Can someone please suggest a replacement for the HP7044A X-Y Recorderin fully digital windoze software? I have not found an under $1K (US) solutionwith atleast 0.01mV or 10uV resolution with atleast two differential inputs.Most of the low-cost daq solutions will not do realtime display of two channelsas XY. Instead they seem to display Ch1&Ch2-Time, then post analyze/plotthem as XY.My Ch1 (X) is +/-10mV full range. Ditto for Ch2 (Y).thanks and regards,- Jim

author: PedroDaGr8
author_rank: Super Contributor
timestamp: December 30, 2015, 09:35:18 pm
content: First you can try calling it Windows, so that you don't sound like a desperately trying to be cool 9 year old. The only thing more cliche is if you called it M$ Windoze.I am not a very experienced programmer and was tasked with a 1D chart recorder at my previous workplace. We ended up going with LabView, including all of its downsides, because for our usage experience it did what we wanted with the least amount of work. The hardware was VERY robust with the level of resolution you are mentioning. Unfortunately, it is much more expensive than your requirements.If you can go with used, you can get the NI 9205 module off of ebay for under $500 (there is one that is asking $250 OBO). This still needs a chasis, none of the single slots are available on ebay right now but you can get a cDAQ chasis for under $300. If you add the LabView student edition, this should allow you to do what you want for under $1000.
Fluke 177/179 AC Volts vs. Frequency Roll-off - Page 1
Forum section: electronics / testgear

author: jp1390
author_rank: Contributor
timestamp: December 28, 2015, 02:09:59 am
content: Hello,I recently purchased Fluke 177 and 179 multimeters and was playing around with the AC Volts measurement mode.It seems that there is a fairly steep roll-off that starts at around 1 KHz in both meters.Wondering if this is expected behaviour. Given that both of my meters are doing the same thing, I would think so, but I can't dig up the rationale.The manual and manual supplement state operation up to 100 KHz for this mode, but I am not fully sure what the sensitivity table in the supplement means.Using my Agilent 33120A in High-Z output mode I put out a 1Vrms sine-wave and jotted the measured outputs (Vrms) from both meters (see attached image for plot).Fluke 175, 177 & 179 Users Manual:http://media.fluke.com/documents/175_____umeng0100.pdfFluke 175, 177 & 179 Users Manual Supplement:http://media.fluke.com/documents/175_____umeng0103.pdfThanks,JP

author: dom0
author_rank: Super Contributor
timestamp: December 28, 2015, 02:21:26 am
content: You misread the specifications. The specified bandwidth off the true RMS part is only 1 kHz (+- 2 % accuracy). Your data lines up perfectly with this. The other specs are for the frequency counter.

author: jp1390
author_rank: Contributor
timestamp: December 28, 2015, 02:29:37 am
content: Yes, good catch you are right about the frequency counter.So really the RMS voltage measurement is only valid for 45 Hz to 1 KHz based on the tables listed in the manual.Is there a reference to the bandwidth limit circuit or reason why they only go to 1 KHz?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: December 28, 2015, 02:38:45 am
content: Quote from: jp1390 on December 28, 2015, 02:29:37 amUsually the choice of the true RMS converter ic, I think.

author: Zero999
author_rank: Super Contributor
timestamp: December 28, 2015, 09:46:59 am
content: There are better true RMS ICs available and meters which can measure higher frequencies. Where I work there's a bench top multimeter which can measure up to 100kHz true RMS quite accurately.
bk precision 2160 time base problem - Page 1
Forum section: electronics / testgear

author: nuwan wijayalath
author_rank: Newbie
timestamp: December 27, 2015, 05:58:19 pm
content: My BK Precision 2160 oscilloscopes time base function not working. X-Y mode working. please help me to find service manual

author: tautech
author_rank: Super Contributor
timestamp: December 27, 2015, 07:40:07 pm
content: Welcome to the forum.Here's a thread on a BK:https://www.eevblog.com/forum/repair/bk-precision-2160a-repair/BK manual page:http://www.bkprecision.com/support/downloads/manuals/en.html

author: nuwan wijayalath
author_rank: Newbie
timestamp: December 28, 2015, 04:46:56 pm
content: Thank you for reply.
Fluke 89-IV unable to connect to Flukeview - Page 1
Forum section: electronics / testgear

author: kamcm
author_rank: Regular Contributor
timestamp: December 27, 2015, 05:13:15 am
content: My Fluke 89-IV unable to connect to FlukeviewAfter digging into the log, I realized it's caused by timeout randomly.I had no idea how to get it work.The log file is attached.Please advice,Thanks
Wandel & Goltermann PS-33A LNT-2 - Page 1
Forum section: electronics / testgear

author: albert22
author_rank: Regular Contributor
timestamp: December 26, 2015, 05:52:24 am
content: I have one PS-33A level generator but I cannot find an operating manual for it. I managed to figure out the basic functions but I think that it can do much more than that.Also I would like to know the polarity of the AC adaptor LNT-2 to build a substitute:http://www.helmut-singer.de/stock/-515793015.htmlTried to disassembly the generator to check the connections to the jack, to no avail.There is a 50/50 chance of getting it right but also 50/50 to damage it, so I need to be sure.Can anyone help me?Thanks & regards

author: SNGLinks
author_rank: Regular Contributor
timestamp: December 26, 2015, 02:30:15 pm
content: I've only got older W&G equipment (PS10 and PM10 I think)I would have thought that there would be reverse voltage protection on the DC input.Is one of the poles of the DC i/p connector connected to the case? If so it's a good bet it's the -ve connection.

author: albert22
author_rank: Regular Contributor
timestamp: December 26, 2015, 10:10:30 pm
content: thanks for your reply. I cannot be sure if it has a reverse voltage protection. The case is made of plastics. There is a bnc and its shield is connected to the outer sleeve of the jack. There is another connector marked with an "earth icon" which is not connected to the jack. As you say, normally the bnc ground or the case goes to the negative. I would like someone to confirm this by measuring his own unit, if possible.
TEK DPO4000C - Page 1
Forum section: electronics / testgear

author: itstechpro
author_rank: Newbie
timestamp: December 26, 2015, 02:31:43 am
content: Looks like Tek realized that losing the TD / FD correlation in the DPO3000 "6-in-one-instrumen" was a mistake and created the 4000C '6-in-one-instrument' series, keeping the very valuable TD / FD correlation. Unfortunately, the end of year promo on the 4000B-3 series isn't available on the C series.Has anyone actually used a 4000C series scope? The SA specs do not appear to have improved over the B so I'm planning to take advantage of the promo and get a 4014B-3, 100MHz analog bandwidth scope with app bundle and hope that upgrading to 500MHz analog bandwidth will get cheaper in the next year or so.Upgrade to 500MHz doesn't seem to require a hardware change but going to 1GHz does ?? Can anyone confirm ??OOPS,Major bummer .... caught by the fine print. 4000B series NOT bandwidth upgradeable but 4000C series is; like the MDO3000. So, what to do ... no promo available on the 4000C yet and the 16 channel logic analyzer is an option on the C.MDO4054 (original pre B series) is available from several sources with DPO app bundle but what are the significant improvements in the Bseries over the earlier MDO4000?Thanks,JM
Identify RF sensor head - Page 1
Forum section: electronics / testgear

author: Bud
author_rank: Super Contributor
timestamp: December 26, 2015, 03:20:52 am
content: Does anyone recognize the RF sensor part pictured in the attached assembly? It is a ceramic part with a input terminal on top that connects to the outer N-type head connector, and two terminals on the bottom that seem to be output terminals that come in contact with the rear assembly , part of which that holds receiving contacts is made of a fiberglass round.The sensor head was part of a RF Peak Power Meter made by Republic Electronic, a link with a picture of it:http://www.exsupplies.com/republic-electronic-ppm101-rf-peak-i3829311/The device seemed to measure up to 3kW RF peak power.I wonder if the detector can be reused but not sure if it is operational and how to wire it. The detector element has the following marking: "reic 3015" on the side and "59 W29" on the bottom. It does not have continuity between any terminals, just shows about 30pF capacitance between the bottom terminals.
Tektronix 465 - Tantalum Caps - Page 1
Forum section: electronics / testgear

author: dan3460
author_rank: Frequent Contributor
timestamp: December 24, 2015, 02:23:30 pm
content: I cannot find the manual for the older run of this model (SN# less that B250000), but I tested a couple of tantalums and they need to be changed.Need help reading this tantalums codes, on this first cap we have top pink? = ?, middle red = 2, dot yellow (show as a line indicating also the + lead) ? = ?, bottom green = 16V, is this a 2uF x 16V.The other top yellow =4, middle purple = 7, dot yellow (shows as a line indicating the + lead?)?=? (doesn't say in the charts that I have seen), bottom blue = 20V, is this a 46uF x 20V.Posted this in another forum but I have gotten no answer.

author: tautech
author_rank: Super Contributor
timestamp: December 24, 2015, 07:11:34 pm
content: From the Manual links in the Repair board:http://www.ko4bb.com/manuals/index.php?dir=Tektronix/Tektronix_-_465_Oscilloscope/Tektronix-465_Service_Manual

author: rch
author_rank: Regular Contributor
timestamp: December 24, 2015, 08:51:17 pm
content: I have no personal knowledge, but idle googling led to:http://pcbunn.cacr.caltech.edu/jjb/Tektronix/212/212-scope-maintenance-manual.pdfAccording to p 5.1 of this, the lowest colour is the multiplier and the stripe at the side (yellow in your second picture) is polarity *and* voltage rating. Perhaps your second one is using this old system, and your first picture is one using the more modern dot system? Edit: misread what you said, top one is the same with a yellow stripe indicating voltage but a different multiplier? Perhaps this is also somewhere in your manual, though you mention the manual doesn't actually apply to your old specimen.Edit. As I see it, a blue multiplier on this system would be 10^6 in pf, therefore effectively x1, but I'm only guessing.Third and last edit: I guess the first one is 2.2uF 20V and the second is 47uF 20V. I think the first ones colours are red and red + grime or flux.
siglent 1052dl - Page 1
Forum section: electronics / testgear

author: adam_lumpkins555
author_rank: Newbie
timestamp: December 23, 2015, 10:00:22 pm
content: My question is simple, Can the Siglent 1052dl be hacked like the Rigol ds1052e? and if so can someone point me in the right direction.... I have watched countless hours of videos and read pages and pages of forums but could not find a single connection between the two!!!!

author: tautech
author_rank: Super Contributor
timestamp: December 23, 2015, 10:30:04 pm
content: Welcome to the forum.Nobody yet has done so AFAIK.Some recent FW has added BW upgrade functionality to the UI of many of their products but at this time Siglent has yet to offer this as a purchasable option.However some of their products are now being looked at closely to see if "upgrades" are possible:https://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/msg800106/#msg800106

author: adam_lumpkins555
author_rank: Newbie
timestamp: December 24, 2015, 12:09:46 am
content: Thanks for the reply!
Chinese electronic DC load  - Page 1
Forum section: electronics / testgear

author: papabol_24
author_rank: Contributor
timestamp: December 22, 2015, 10:32:36 am
content: Hello, got this electronic dc load from aliexpress and used it to test a recapped astec 24v psu

author: nidlaX
author_rank: Frequent Contributor
timestamp: December 22, 2015, 10:48:58 am
content: Nice. It's got a battery test mode. There's also a header under the screw terminals for voltage sense.If you can understand Chinese:http://v.youku.com/v_show/id_XODE1NjU0Mzc2.htmlWhen the batt test is finished, it starts beeping, and you can then view the average voltage, Ah, and Wh logged over the discharge period.

author: papabol_24
author_rank: Contributor
timestamp: December 22, 2015, 11:17:10 am
content: Thanks for the video link

author: crispy_tofu
author_rank: Super Contributor
timestamp: December 22, 2015, 12:27:02 pm
content: Very nice, thanks for sharing!By the way, does anyone have a link to the AliExpress page?Never mind, foundone

author: wblock
author_rank: Regular Contributor
timestamp: December 22, 2015, 03:35:08 pm
content: Are the components on the heatsink labeled? Well, the transistors anyway, the one on the left looks like a temperature sensor. Obviously, the power is being dissipated in those components, but it's not clear exactly how. PWM of a very low-resistance load?

author: Kleinstein
author_rank: Super Contributor
timestamp: December 22, 2015, 04:37:36 pm
content: Electronic loads usually use some kind of linear konstant current circuit - thats the basic mode. In some cases it is possible to emulate a resistor my having the current proprotional to the voltage.The board looks a little like a R2R DAC (many 103 and 203 resistors) - in this case there would be not good resistance mode (this usually would need a DAC with external reference).

author: papabol_24
author_rank: Contributor
timestamp: December 23, 2015, 05:40:13 am
content: Hello, the one in the middle is a ST 31C126, on the right is a ST STPS3045C, a 272C chip near the load input and the MCU is a STM8S00

author: papabol_24
author_rank: Contributor
timestamp: December 23, 2015, 05:59:12 am
content: Quote from: Kleinstein on December 22, 2015, 04:37:36 pmYes, at 1-6 volts it can test current up to 9.99 amps then the current drops down as you increase the voltage, at 24 volts the max current that this thing can test is 2.5 amps..
multi-channel digitizer - Page 1
Forum section: electronics / testgear

author: LeoUCDavis
author_rank: Contributor
timestamp: December 24, 2015, 10:35:31 pm
content: For many of my projects, I have the need to digitize multiple (>signals (20MHz bandwidth) at the same time. I wonder if the forum has any recommendation on low cost digitizers? Preferably, the digitizers should have an easy to use API interface (or open source drivers) for Windows/Linux/OSX.Thanks!
Owon VDS3104 USB scope review & teardown - Page 1
Forum section: electronics / testgear

author: nidlaX
author_rank: Frequent Contributor
timestamp: December 22, 2015, 10:31:23 pm
content: Thanks for the teardown Mike! I think a refined, headless scope module could really be the ideal scope for students and hobbyists. They need to make a version with built-in WiFi or Bluetooth connectivity and spend a good deal of effort to create a polished UI for PCs and tablets. NI's VirtualBench is a great example of a step in the right direction, and I hope the Chinese companies will follow suite.
Looking to buy Rigol DS1054Z - Page 1
Forum section: electronics / testgear

author: ZeroTolerance
author_rank: Contributor
timestamp: December 21, 2015, 09:56:13 pm
content: I am looking to buy a Rigol DS1054Z O-scope and was wanting everyone's thoughts on this? I like the price point with the ability to get 100mHz out of it. Good buy?I currently have a Fluke/Philips PM3335 and a HP 1662CS Logic Analyzer/Oscilloscope.

author: ataradov
author_rank: Super Contributor
timestamp: December 21, 2015, 10:11:51 pm
content: That largely depends on what you want to do with it. If it is a general purpose scope of MCU-based projects, then sure, it is a good buy.

author: Fungus
author_rank: Super Contributor
timestamp: December 21, 2015, 10:44:39 pm
content: Quote from: ZeroTolerance on December 21, 2015, 09:56:13 pmAt this price? The best. Nothing else is close.

author: warnberg
author_rank: Contributor
timestamp: December 22, 2015, 12:18:26 am
content: Buy it, love it, use it.... for 400.00 how can you pass it up?I just got mine, glad I took the plungeEnjoyDavid
Tektronix DPO4000 schematics ??? (/repair help...) - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: December 29, 2015, 09:06:49 pm
content: I'm fighting with a dead DPO4034... I connected a replacement PSU (which was missing)... but now I'm missing many secondary voltages on the J890 pads (as per the service manual), 12V is obviously present (as provided by the PSU), 10.8v as well, but 17V shows 0V, and all smaller voltages (1,5V, 3.3, 5V, etc...) show irrelevant values...So it looks like the "voltage regulator part" of the mainboard is more of less dead... now given the price of a DPO4034 mainboard, it's probably worth a try finding out what's wrong, especially as the components on that part are far less "exotic" than on other parts of the mainboard...I'm thus calling for a miracle... should someone have the schematics of a DPO4000's mainboardI guess this could even be worth some money... ;-
HP/Agilent 34970A - Homebrew plug-in cards - Page 1
Forum section: electronics / testgear

author: magnehh
author_rank: Contributor
timestamp: December 21, 2015, 07:47:15 am
content: So I've got a couple of HP/Agilent 34970A switch units (Technical summary) for free. Actually, I fished them out of a dumpster. One is fully functioning, the other has a bad FRAM. Both have the DMM module.Looking on eBay, the plug-in cards to make the units actually do something cost an arm and a leg! As a uni student, I have absolutely no money to spend on these things. Come the idea of homebrewing the cards.As far as I can tell, the electrical interface is fairly easy. A standard UART or whatever. Seems the biggest problem is the software protocol. From what I've read here and other places, there are quite a few people using these. Has anybody tried doing this before? Or perhaps you know where I can find the necessary documentation? From what I remember, there's not a word about it in the service manual.I've always been fascinated by automation, so it would be great fun getting these boxes to work with MATLAB or LabView.Best regards,Magne.

author: 3roomlab
author_rank: Frequent Contributor
timestamp: December 21, 2015, 08:22:57 am
content: check this threadhttps://www.eevblog.com/forum/projects/diy-low-thermal-emf-switchscanner-for-comparisons-of-voltage-and-resistor-stand/msg610865/#msg610865

author: HighVoltage
author_rank: Super Contributor
timestamp: December 21, 2015, 06:01:45 pm
content: The 34970A is a very good testing box, I also have two of them.From time to time you can find the cards for a very low price online.I have never seen nor heard of any self made cards for the 34470A.Post some pictures of your units.I am interested to see how dumpster units look like, since I am repairing one of my own right now.https://www.eevblog.com/forum/repair/agilent-34970a-battery-replacement-and-repair/msg819253/#msg819253
Rigol DS2000A - CH1/CH2 difference in noise and mechanical vibration sensibility - Page 1
Forum section: electronics / testgear

author: EdoFede
author_rank: Newbie
timestamp: December 20, 2015, 03:51:53 pm
content: Hi all,I'm playing around and testing with my new DS2072A scope.Someone other than me, has noticed different sensibility to noise and mechanical vibration between CH1 and CH2?I found out by trying to connect two 50 Ohm terminator to the inputs.CH1 got some spikes with terminator attached, CH2 near-no difference.(500uV/div)Without terminators:With terminators:Another strange behaviour I've noticed is a big difference in sensibility to mechanical vibration between CH1 and CH2.Tapping front panel:Closing top handle:Not a big issue, but strange, not?I've also noticed a slight positive DC offset (about 0.2div) on CH1, even after auto-cal run.Bye,Edoardo
Anyone unlocked Hameg oscilloscopes? - Page 1
Forum section: electronics / testgear

author: mehdi
author_rank: Regular Contributor
timestamp: December 19, 2015, 09:29:33 am
content: HiI've seen hacks which let you unlock functionality for Agilent and Rigol oscopes.Has anyone worked on Hameg (R&S) products?I'm willing to work on my new Hameg HMO1002 (increase bandwidth and/or add bus decoding capabilities)Any ideas about where to begin? (Are these hacks fully software based reverse engineering or contain hardware inspection too? Should I start reversing the firmware?)I can work on the software RCE side, but will definitely need help for the hardware part.Thanks in advance
HP 85B GPIB secondary addressing - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: December 18, 2015, 05:34:59 pm
content: Just received my early xmas present today, a HP 85B with GPIB interface (o;Is there a way to make it talk to GPIB devices with secondary addresses?Seems even with secondary address at "0" it hangs during read...

author: Deathwish
author_rank: Unknown
timestamp: December 18, 2015, 08:24:49 pm
content: not sure if relevant but i read this.To address a device at primary address 4,Address = 7 & 04 = 704To address a device with a primary address of 4 at secondary address2,Address = 7 & 04 & 02 = 70402The National Instruments NI 488.2 Commands use two variables,Bd and Address to express the device address. Bd contains the Card contains the Cardnumber and is 0 for the fi rst card. Address is a 16 bit variable withthe secondary address in the upper byte and the primary addressin the lower byte.Address% = [ss + 96]*256 + ppTo address a device at primary address 4,Address% = 0 + 4 = 4To address a device with a primary address of 4 at secondary address2,Address% = [ 02+96 ] *256 + 4= [ 98 ] *256 + 4= 25088 +4 = 25092

author: Deathwish
author_rank: Unknown
timestamp: December 18, 2015, 08:28:17 pm
content: http://www.icselect.com/pdfs/ab48_11.pdf

author: davorin
author_rank: Unknown
timestamp: December 18, 2015, 08:38:24 pm
content: Well some HP Basic example programs show the secondary addressing as "OUTPUT 70903;"*IDN?"....but using a 5 digit address throws an error on the HP 85B....Guess back then in the early 80s there wasn't any secondary GPIB addressing.
Twintex TP-3300U Programmable power supplies - Page 1
Forum section: electronics / testgear

author: jay
author_rank: Regular Contributor
timestamp: December 18, 2015, 06:55:25 pm
content: Has anyone bought Twintex TP-3303U or TP-3305U power supply? Any comments on quality? I'm trying to decide between this and a GW Instek model.Searching the forum resulted in only few threads about Twintex anything, so I guess they are a small player in the business.Datasheet is athttp://www.twintex.com.tw/proimages/SZ_Datasheet/Twintex_Datasheet_TP3300U.pdf
PM6304 Noise can somebody verify? - Page 1
Forum section: electronics / testgear

author: Le_Bassiste
author_rank: Frequent Contributor
timestamp: December 18, 2015, 03:01:50 pm
content: hi, i'm currently verifying the performance of an old Philips (ante-Fluke) PM6304 LCR meter. it is one from the very early series that had the AC mains switch still on the back sidewhile the meter is astoundingly accurate, it _seems_ to have a noise issue when doing measurements at low frequencies, say, 50, 600, 100 Hz, which i noticed when trying to measure a 100 Ohms resistor. the display is quite "jumpy" at those frequencies, something like 99.63 Ohms, up to 100.06 Ohms. measuring the same resistor at 10 kHz, the display is very stable at 99.885 Ohms, +/- 2 digits. here are some SDEV figures i got from measuring that 100 Ohm resistor at different frequencies. all measurements taken at HI output, no AVERAGE. values shown are taken across 32 readings each, with SDEV values being ppm of the average of 32 readings:Code:originalw/o R202frequencysdev ppmsdev ppm50982,81411,681001194,55469,78100087,0238,63200047,3522,12100009,287,822000012,6410,1510000013,1616,41can somebody confirm those noise numbers? for the fun of it, i removed the 75 Ohms load resistor R202 from the synthesizer DAC and re-calibrated the synthesizer output back to 2VRMS according to the manual.that improved the nosie values quite a bit, but the instrument ran into CAL errors when trying to give it a full re-cal.removing that resistor brings the b/w of the synthesizer a bit down, so it seemed to me that this helped to improve jitter from the DDS.any suggestions?
Hantek MSO5102D - LA triggering problem - Page 1
Forum section: electronics / testgear

author: majsta
author_rank: Newbie
timestamp: December 17, 2015, 03:21:07 pm
content: Hi, few days ago I got my first scope and I needed something with logic analyzer. So far I was using Altera Signal Tap II and I was happy with it so I wanted the same features on the scope but either I m going something wrong I m unable to get trigger using logic analyzer part.Just to mention that using scope probes and same trigger condition is working perfectly.So what I need is to detect rising or falling edge of CMOS signal. Logic analyzer part of scope is not triggering at all no matter what condition I set, it should be really simple, few things to set and that's it. Only difference between changing trigger source from CH1 on scope side to D1 or something on LA side. Also I have tried to manually enter voltage or to use set to 50% option. What I see that only force trigger works when RUN is on. On capture SINGLE SEQ nothing happens and just like waiting for something that is not there. Let me repeat myself once more, the same settings works nicely when I set as a source CH1. So far only option I see here is to use scope to trigger some event and to see what happened on that event using LA, but then that is something I can't use when I want to capture some special event on address bus of a CPU. What's especially frustrating to me is that most of the things I figured out in first 20 minutes of using this scope and now I m sitting in front of him for hours simply don't understanding where I m going wrong. Keep in mind that this specific model is resetting like crazy, let's say 5 times today but even that is not a problem. So bottom line why triggering on CH1 or CH2 works perfectly and on LA side not.

author: majsta
author_rank: Newbie
timestamp: December 18, 2015, 11:41:06 am
content: I m really sorry but I gotta refresh this page and please can someone with the same device help me here. I have downloaded "latest" version of firmware and upload it but problem remains. Can someone read what I have said in first post and try to use SINGLE SEQ on triggering event on rising or falling edge of CMOS or TTL signal using Logic Analyzer part. I have searched this forum and can't find anything similar with my problem.
Rigol probes - Page 1
Forum section: electronics / testgear

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 20, 2015, 04:46:55 pm
content: Oh boy, the probes that came with my DS1054Z don't quite fit into the "probe tip to BNC" adapters I have. The Rigol's ground sleeve at the tip is somewhat narrower than all the Tek probes I have.Is this normal? I thought passive probes were all more or less the same WRT to that diameter. This also means I need to keep the "ground springies" separated.

author: smgvbest
author_rank: Unknown
timestamp: December 20, 2015, 06:47:21 pm
content: There are common sizes but they are not all the same size.The Tek are 3.5mm probes and I think the Rigol are 5mmI think these would work for the Rigol onhttp://www.amazon.com/gp/product/B009QBFK7C?keywords=oscilloscope%20probe%20to%20bnc%20adapter%205mm&qid=1450637082&ref_=sr_1_fkmr0_2&sr=8-2-fkmr0You might want to measure to be sure
Rigol DS1054Z for $89.99? - Page 1
Forum section: electronics / testgear

author: barry14
author_rank: Regular Contributor
timestamp: December 18, 2015, 04:02:50 am
content: Is this Ebay auction legitimate:http://www.ebay.com/itm/Rigol-DS1054Z-50-Mhz-4-Channel-Digital-Oscilloscope-/231786662145?hash=item35f78fc901:g:tVQAAOSwZ1lWcniE

author: ataradov
author_rank: Super Contributor
timestamp: December 18, 2015, 04:27:05 am
content: https://www.eevblog.com/forum/buysellwanted/rigol-ds1054z-new-free-international-shipping-for-$90/

author: bitseeker
author_rank: Super Contributor
timestamp: December 18, 2015, 06:53:01 am
content: Highly unlikely. See thread in Alex's post, above.
Calibration of UT81B - Page 1
Forum section: electronics / testgear

author: Joules
author_rank: Contributor
timestamp: April 15, 2013, 05:12:45 pm
content: Hi guys,I'm new here, but happened on a useful feature for anyone with a UT81B scope meter. If you power the device up and hold the HOLD button down it takes you to a calibrate screen for the scope.Press F1 to enter calibration, or F4 to QuitYou will then be asked for a password, 5 seconds of hacking solved it. Press F4, F3, F2, F1Next it will ask you to short the leads and set the base level for the voltage ranges, press F4Once it has cycled through that, you need to have a precise 600mV source ready, I used my PSU and a voltage divider to get it spot on, and left my reference meter in circuit. Press F4This will cycle to the next 1.5v reference and finally the 3v reference. F1 at the end to save the new calibration and your done.I gained a further 15mV accuracy doing this on my meter thats a few years old.Joules

author: Rick Law
author_rank: Super Contributor
timestamp: April 17, 2013, 12:43:02 am
content: Thanks for sharing!How is the UNI-T 81B serving you? I am trying to talk myself into needing one.

author: Joules
author_rank: Contributor
timestamp: April 17, 2013, 07:23:50 am
content: Rick,I've actually been very pleased with mine. It's not my only meter and I use it mostly with a netbook for data logging (up to a week logging) battery charge discharge cycles and charge controllers for solar installs, so pretty much low frequency stuff. It is very handy for looking at mains voltage stuff, checking my inverters and generators are producing clean sine(ish) waves. The fact it is cheap and portable over my dual trace analog Hameg, means it is a first fix scope for quick diag's before more in depth work. Its also my only storage scope for now.If I was buying again, I would also consider the new UNI-T 25Mhz scope once I learn if it is optically isolated for data logging.A friend picked my meter up in a Chinese market about 4 yrs ago. Use it several times a week if its not tied up logging so for me its been reliable. Can't really ask more of it than that.

author: Unknown
author_rank: Unknown
timestamp: December 17, 2015, 11:42:16 pm
content: Quote from: Joules on April 15, 2013, 05:12:45 pmFYI, I have the UT81C and I had to hold down the hold button as I switched modes to get the cal screen. Thanx to Joules BTW
L&N 4754 : Teardown and test - Page 1
Forum section: electronics / testgear

author: TiN
author_rank: Super Contributor
timestamp: December 16, 2015, 04:55:32 pm
content: Look what has arrived in my mail.Some wirewound porn inside:It's a bit sick, but still works okayish. I used my sick 3458A to get some test data off it, using python app to cycle thru ranges and values (while working myself as motor for decade switches).All photos and hi-res links, including python app code as usualfully available here.P.S. Winning bid for it was 20$, but shipping 80$

author: guido
author_rank: Regular Contributor
timestamp: December 16, 2015, 10:18:43 pm
content: The 1972 L&N catalog was on voltnuts recently (153MB). It's in there. Resistance box from DC to high frequencies.Moderate accuracy in 1972

author: Vgkid
author_rank: Super Contributor
timestamp: December 16, 2015, 11:38:49 pm
content: Thanks for the teardown. I believe that is a L&N type 31 switch inside.

author: TiN
author_rank: Super Contributor
timestamp: December 17, 2015, 04:33:14 am
content: Yes, I got that one and linked it in article.I wonder if there is datasheet for this specific decade anywhere.

author: guido
author_rank: Regular Contributor
timestamp: December 17, 2015, 11:37:15 pm
content: Basic specs are on the page. Bit hard to read.Here's another try
Meter Calibration - self calibratable vs. step based - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: December 17, 2015, 08:45:12 pm
content: So, I was reading the 87V thread and wondered if the calibration type of a meter ever goes into someone's decision making. Many older Fluke's and even some newer ones can be calibrated with trimmers, but many are also what I am going to call "step based" where you must go through the entire calibration process and provide each electrical condition it is looking to calibrate to - requiring a calibration that not many of us would have. Or you have to send it out to be calibration, again at an expense that is sometimes cost prohibitive depending on the value of the meter. This probably relegates many meters to buy them, use them while they are in spec, and then perhaps they aren't worth the price of calibrating.My favorite Fluke is the 189. I've got a pair of them and use them for practically everything, but I've got no way to calibrate them. My many other Flukes can be easily calibrated by providing a single DC or AC voltage and adjusting a pot or two. Even some of the newer ones like the 15B (not plus) I bought a few years ago.

author: Lightages
author_rank: Unknown
timestamp: December 17, 2015, 09:01:15 pm
content: The benefit of closed cased calibration designs is that they will be probably more accurate across the range of each function. It could also be cheaper as instead of needing to select very accurate divider resisters you can get lower spec parts and calibrate out the variance. Trim pots are subject oxidation, ambient humidity, and vibration.One should never calibrate/adjust a multimeter in a hobby shop and expect reliable results. Depending on the accuracy spec of the multimeter, you need a properly climate controlled lab and the right calibration references that are 10x better in accuracy than the device being checked. Of course if you have a multimeter that has 5x to 10x the accuracy of another multimeter, that could be used as an ad hoc calibration. It is still not a proper calibration unless the conditions are correct and the higher accuracy multimeter is actually known to be in spec.

author: tautech
author_rank: Super Contributor
timestamp: December 17, 2015, 09:21:30 pm
content: Quote from: alank2 on December 17, 2015, 08:45:12 pmFor me now most definitely.With the availability of cheap accurate references just for this purpose it seems weird that some manufacturers are moving away from self adjustment capability. Protecting their authorised Cal labs?Recent discussion re Fluke 17B+:https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg809665/#msg809665
Keysight DOA - Page 1
Forum section: electronics / testgear

author: kaz911
author_rank: Super Contributor
timestamp: December 16, 2015, 01:23:03 pm
content: Sad sadJust had delivery of my latest Keysight devices - but it arrived DOARight out of the bag - no lights at all. Might be simple to debug...Anyway it is not worth repairingbut to send out so cheap Chinese crap is not really worth the postageDear Keysight - please send better quality freebee'splease please - it is better for your brand as well. And have a word with the new MBA in marketing who purchased those "screwdrivers"And merry Christmas to all.

author: saturation
author_rank: Super Contributor
timestamp: December 16, 2015, 02:29:31 pm
content: What is it? What is its power source, if its Li type it may be disabled or removed for air shipping.

author: kaz911
author_rank: Super Contributor
timestamp: December 16, 2015, 02:52:53 pm
content: it is their little tool they send out for free if you tried the 3000T challenge - no batteries was depleted - sent out with power in on position/k

author: jc101
author_rank: Frequent Contributor
timestamp: December 16, 2015, 04:47:20 pm
content: Quote from: kaz911 on December 16, 2015, 02:52:53 pmI had one of those, it was dead too.PS: But I won one of the 3014T's in the challenge, with luck it will be here Friday

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: December 16, 2015, 05:17:27 pm
content: Not an MBA here, sorry. PM me your address and I'll try get you another one!Quote from: jc101 on December 16, 2015, 04:47:20 pmjc101, I think you'll probably be too busy playing with your new scope to need another. Congrats!

author: lukier
author_rank: Unknown
timestamp: December 16, 2015, 05:26:00 pm
content: Quote from: jc101 on December 16, 2015, 04:47:20 pmDid Keysight announce Dreambench Sweepstakes winners already?

author: kaz911
author_rank: Super Contributor
timestamp: December 16, 2015, 06:36:33 pm
content: Quote from: Keysight_DanielBogdanoff on December 16, 2015, 05:17:27 pmDaniel - thanks - but it is not really worth the postage as it is a P O S - and NOT up to any Agilent/Keysight Standards - but thanks for the offer.Please tell marketing to ship things "approved" by the same engineers who make the rest of your gear - I love my Agilent Gear (and do not have any Keysight gear yet - apart from the cheap screwdriver)

author: dadler
author_rank: Unknown
timestamp: December 16, 2015, 07:43:18 pm
content: Oh geez, it's a free gift.

author: kaz911
author_rank: Super Contributor
timestamp: December 16, 2015, 07:58:54 pm
content: not to let the thread run out of wack - it was a little pun - and I'm not too serious if it works or not.But free gift's from a high end brand - should at least try to reflect part of the brand quality.

author: dadler
author_rank: Unknown
timestamp: December 16, 2015, 08:01:29 pm
content: I'd prefer the value went into the products, not subsidizing free marketing gifts, but that's just me.
Question in the abstract: Newer/older oscilloscopes of the same apparent specs? - Page 1
Forum section: electronics / testgear

author: ajrabassa
author_rank: Contributor
timestamp: December 16, 2015, 05:21:23 pm
content: I'm looking around at oscilloscopes, and I've been unable to answer my own question just through research. This is a navel-gazing sort of question, so if it's off topic I apologize.I notice I can buy scopes from in the early 2000s, calibrated, with the same specifications as a brand new scope from 2015 - for example, call it 1 Ghz, 4 Gs/S, and 1Mpts storage. From what I can figure out, the scopes of that spec from 2000 might have been $20k USD when it came out versus $8k USD for the new scope of the same specs today.What else goes into an oscilloscope that would differentiate these two, in both software and hardware? I'm struggling to find information that would give a solid answer outside user preference or a slightly nicer GUI.

author: nctnico
author_rank: Super Contributor
timestamp: December 16, 2015, 06:42:17 pm
content: The newer devices tend to have:- LAN connection- USB storage support- Protocol decoding- Less weight/size/noise- TFT screen instead of CRT

author: dom0
author_rank: Super Contributor
timestamp: December 16, 2015, 06:50:22 pm
content: Quote from: nctnico on December 16, 2015, 06:42:17 pm- Manufacturer support

author: tautech
author_rank: Super Contributor
timestamp: December 16, 2015, 06:56:45 pm
content: Quote from: dom0 on December 16, 2015, 06:50:22 pm- Greater Memory depth
Simpson 270 Series 3 - resistance questions - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: December 15, 2015, 03:58:49 pm
content: So I got my grandpa's old Simpson 270 Series 3 over the weekend. I've tested the DC and a small AC range and it is right on - who knows how many years this has been sitting or the last time someone calibrated it!I can't get the needle to move for resistance however. I put in new batteries (4xAA and 1xD) and when I switch to the resistance ranges I can read the 1.65V of the D on the leads using another multimeter, but the 4xAA is measuring 8V! When I measure it at the battery terminals it is 6.5V so I don't know where the - wait - does it have the D also in series for this measurement? Yep, I see that it in the schematic. Any idea why the needle won't move when I short the leads? What should I check first?

author: alank2
author_rank: Super Contributor
timestamp: December 15, 2015, 07:32:50 pm
content: See the picture in the 4th post from the bottom where it shows the shunt R32 at 50 uA. How do you set it to 50 uA? His note says something about 250 mV.http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=56942Here is a picture though mine isn't 100% the same. The R32 is the square with the blue. Why is it different than the other pots? How can I adjust it to 50 uA?

author: alank2
author_rank: Super Contributor
timestamp: December 15, 2015, 10:19:33 pm
content: Well, I got it all figured. This thing is pretty cool. The resistance was an odd issue, I found out that this meter had the pcb changed for some reason and The zero adjust pot was never soldered to the pcb. Two solder joints and that works perfect.
DER EE DE-5000 random ER01 on power on - Page 1
Forum section: electronics / testgear

author: dav
author_rank: Regular Contributor
timestamp: December 11, 2015, 06:44:13 pm
content: Hi all,I just received a brand new DE-5000.I switched on and I got the ER-01 message on screen (with no probes attached)Turning off and then on the unit worked fine.After some on and off I got (randomly) again that message.Is my unit faulty??

author: mos6502
author_rank: Frequent Contributor
timestamp: December 15, 2015, 11:31:48 am
content: Have you done a calibration yet?

author: dav
author_rank: Regular Contributor
timestamp: December 15, 2015, 03:10:38 pm
content: Yes I calibrated it.But .... do I have to calibrate it every time I switch on??However good news, I never had that error again.

author: mos6502
author_rank: Frequent Contributor
timestamp: December 15, 2015, 04:06:12 pm
content: No, you don't have to calibrate it every time you turn it on. I think the EEPROM just is empty/has garbage in it until you do the first calibration, that's what causes the error.

author: dav
author_rank: Regular Contributor
timestamp: December 15, 2015, 06:50:18 pm
content: Ok, so this explains why I don't get anymore that error (I calibrated it).
zd 985 desoldering station - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: December 15, 2015, 12:28:30 pm
content: Just got one of these of eBay.ebay.co.uk/itm/STATION-ZD-985-WELDING-SOLDER-SOLDERING-DESOLDER-GUN-DESOLDERING-PUMP-REWORK-/271875656164?hash=item3f4d0d49e4:g:DKMAAOSwEeFVJWmsOnly paid a less than a tenth of that price a barging 😊R_G_B

author: GreyWoolfe
author_rank: Unknown
timestamp: December 15, 2015, 01:12:12 pm
content: Nice! I have one and am generally happy with it.