hybridfree/eevblog-posts huggingface dataset:
My Keysight E5071C cannot find the Windows operating system. - Page 1
Forum section: electronics / testgear

author: Marcel G
author_rank: Contributor
timestamp: July 27, 2019, 04:13:11 pm
content: My Keysight E5071C cannot find the windows 7 operating system anymore.Who known how to get the system working again?It happend after I started the analyzer with an USB stick in it with a CKT N calibration kit file.Who knows a solution so that the analyzer start again from the right disk?Regards,Marcel
Looking for Information on a Buchler Scientific Electrophoresis PSU - Page 1
Forum section: electronics / testgear

author: H713
author_rank: Regular Contributor
timestamp: July 27, 2019, 06:42:12 am
content: Since I've just designed a 0-500V 50-500mA linear power supply, it would figure that I'd win an auction like this.Today I won a surplus auction on a Buchler Instruments 3-1014A Electrophoresis power supply. In hindsight, compared to the eBay prices, it wasn't the world's greatest deal, thought not bad, and it was local so I didn't have to pay for shipping.I popped the lid, everything looked well, and powered it up. Seems to work fine, at least from what I can tell. That said, I really, really would like a service manual or a schematic or even a simple user manual- some amount of documentation on this thing would be greatly appreciated. If anyone has one, or knows of someone who does, please let me know .Now- I know next to nothing about electrophoresis power supplies, and after a quick google search I have a vague idea of what electrophoresis is. Visual inspection suggests that it's an old-school (1970s) switcher. It has a massive transformer and a high-voltage bridge rectifier (lots of diodes in series), and a pair of large oil-filled caps. There are also a pair of what I assume are chokes (they have a core gap, so I can't imagine what else they would be). It has two stud-mount SCRs, which I assume is being used for switching. My somewhat educated guess is that it is using the large xformer to step up the voltage, and the SCRs are being used for some form of switching regulation (PWM perhaps?). Again, this is all just a guess without a schematic.Since I'm not too confident that I'll track down a schematic, do electrophoresis power supplies make decent bench supplies? I'm not sure what sort of noise and regulation specs are required for electrophoresis, nor how robust the supplies need to be (duty cycle, resistance to abuse, etc). I have intentions of using this for testing tube circuits, mostly those in excess of the 500V maximum output of the power supply I'm currently building.I'll post some pics of the inside tomorrow.Thanks,H713.
WANDEL & GOLTERMANN SPM-15 SERVICE MANUAL AND REPAIR - Page 1
Forum section: electronics / testgear

author: Cláudio Vincenzi
author_rank: Newbie
timestamp: July 27, 2019, 02:47:47 am
content: Hello everyone!I just acquired a Wandell & Golterman Selective Level Meter (Selektiver Pegelmesser) model SPM-15 from an online marketplace. The set is powering-up and the control panel controls seems to be responsive. I tried to find a user manual online with no success, so I was basically guessing with it. The only thing I found was a synthetic datasheet informing the main technical specifications (http://www.testequipmenthq.com/datasheets/WANDEL%20&%20GOLTERMANN-SPM15-PSE%2015-Datasheet.pdf).After some try and error with it, I finally found that the frequency/tracking generator seems not to be working properly. I attached a scope to the frequency output BNC connector and it was possible to see that it actually is outputing some fixed frequencies (counted at least 4 different ones) but the frequency controls on the front panel seems not to be actually controlling the PLL/oscilator although the display is responsive to the controls (what make me think that the internal micro controller is getting the input signals from the panel buttons and is output controlling the led displays correctly). The front-end RF input amplifier and the power/level meter and attenuators (both analogic and digital) seems to be working OK since it is sensitive the the fixed frequencies that the oscilator produces. I tested it with a RF generator and was able to meter these frequencies (I don´t have them here with me, but the first one I remember is something about 625Khz).I would like to go ahead and fix it cause seems to me that it can be a valuable instrument for RF/HF experiments, tests and repairs. After a lot of online search, I was unable to find any operating or service manual for the SPM-15, so I´m in the dark. I found some sites having lots of info and PDF manuals for other W&G test equipments, including other SPMs models, like the SPM-19 and SPM-60, (e.g.http://ftb.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Wandel_and_Goltermann) which is a good thing cause the internal architecture of the SPM-15 probably is not radically different from those ones.If anyone can help me find more documentation/manuals for the SPM-15 or even help me with the fix and repair I would be very grateful.Thanks in advance!- Attachments and other options
Rigol DS1054z oscilloscope, show all its settings as a whole (at same time) - Page 1
Forum section: electronics / testgear

author: miggarc
author_rank: Newbie
timestamp: July 25, 2019, 09:53:14 pm
content: HiI have a Rigol DS1054z oscilloscope, since some time ago.Is there is a way to make itshow all its settings as a whole(and obviously at the same time) on its own screen,like a summary of them all ?(I know nearly all settings - if not, in fact, all of them - are shown through Ultrascopebut I'm not talking about that solution)I´m asking this because, some times, we are seeing wrong measurements resultsdue to inadequate settings that we aren't we aware because, many of them, are notshown around the main screen .Thanks in advance,Miguel Garcia

author: thm_w
author_rank: Super Contributor
timestamp: July 26, 2019, 12:11:34 am
content: No. You could use SCPI and a command like :SYSTem:SETup? or query all of the individual settings.Best to load Default settings on the oscilloscope then set up whatever required measurement settings are needed (either manually or via SCPI script).
Promac Calibrator Model DHT 730 - Page 1
Forum section: electronics / testgear

author: Aladio
author_rank: Newbie
timestamp: July 23, 2019, 11:42:20 pm
content: I am the proud owner of a Promac Calibrator Model DHT 730. I am wondering if anyone here has ever used a unit like this and if they have, is it worth fixing?https://www.ebay.com/itm/Promac-Calibrator-Model-DHT-730-w-Case-amp-Accessories-UNTESTED-Promac-Controls-/312689805338?nma=true&si=lCTiOHBh3NOgbIhK8DUEtiQl7A4%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557Unfortunately it is not working. Nothing on the screens, nothing on the inputs or outputs. I have done some rudimentary testing but so far have only be able to make the LCD show all characters for a split second when switching off. I have not been able to find anything on the net about this model. I do have an instruction manual for the DTH 720 and it is pretty close but not the same.Thanks in advance to anyone who takes the time to respond to this post!
Anyone have experience with the SynthHD Pro by Windfreak Technologies? - Page 1
Forum section: electronics / testgear

author: Plasmateur
author_rank: Regular Contributor
timestamp: July 31, 2019, 05:39:43 pm
content: Checking to see if anyone owns are has tested this device.I'm considering gettingthisunit as I need to be able to pulse two pure sin waveforms with a small delta_f between them, while the phases of the wavefront do not chance between each pulse.I am unable to achieve this for certain frequencies using two Agilent E8267D signal generators while the 10MHz clocks are tied.f2 is only phase locked with respect to f1 so long as f2 is in increments of 10MHzExamples:f1 = 5 f2 = 5.01 phases are locked between each pulsef1 = 5 f2 = 5.011 phases are not locked between each pulseIt appears the SynthHD Pro should be able to do this, and value on this device seems pretty insane for the price. Looking at the data sheet, I may need to use some band pass filters along with this unit, as at higher power, the 1/2 harmonic seems to be on the same level as the fundamental. However, if I'm using a wave guide, this shouldn't be a problem so long as I include an isolator.
Picotest J2120A Line Injector for PSRR Measurments - Page 1
Forum section: electronics / testgear

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: July 23, 2019, 01:10:01 pm
content: I'm looking into measuring to PSRR of different switching / linear regulator / filter combinations (about 1-2A for 5-15V).There is this nice injector from Picotest, J2120A (5A at 50VDC max). However, here it is about 620 Euros with tax which is a bit much for a fun project and more than I paid for my 3577AI found surprisingly little regarding psrr measurment so far. Most usefull was:http://www.ti.com/lit/an/slaa414a/slaa414a.pdfThe active summing amplifier based on the THS3120 is good voltage wise but only does 490mA max.So my question is how does Picotest manage this? I don't assume they use the passive summing since their inductor becomes to big and their performance at 10MHz would not be great. However, 500mA seems to be the limit for the fast opamps in that range. So maybe an opamp and a bjt / mosfet in a series configuration?Maybe a owner had a look inside one already?

author: exe
author_rank: Unknown
timestamp: July 23, 2019, 01:34:11 pm
content: Quote from: sixtimesseven link=topic=200349.msg2565324#msg2565324Put two in parallel?May be a small resistor will be needed for better current sharing... unless ferrite bead is already enough.

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: July 23, 2019, 02:27:20 pm
content: Quote from: exe on July 23, 2019, 01:34:11 pmWell if they put 10 of them in parallel in there then at least the BOM / price ratio of the picotest box gets better
HP 3580a - no display (Black screen) - Page 1
Forum section: electronics / testgear

author: letron77
author_rank: Contributor
timestamp: July 23, 2019, 04:05:39 am
content: Hello everyoneAfter the problems I encounter with my 2015 Keithley, I now have problems with my spectrum analyzerI turned on yesterday my HP 3580a spectrum analyzer (I had not turned it on for at least 6 months)I saw a signal on the screen for 5 seconds then nothing!Now when I turn it back on I sometimes have a brief signal on the screen (especially when it is cold) then after nothing else even if I cut it and turn it on again and again.From the manual and diagrams I can try to check some tensions?(before putting it in the trash)Have a good day

author: Shock
author_rank: Super Contributor
timestamp: July 23, 2019, 06:11:12 am
content: Quote from: letron77 on July 23, 2019, 04:05:39 amPlease don't trash it, but if you do save some parts for me! These spectrum analyzers are getting expensive to buy or get in good condition. Go through the troubleshooting procedures in the manual/service manual first and check voltages as you said.

author: MadTux
author_rank: Frequent Contributor
timestamp: July 23, 2019, 11:11:28 am
content: I don't have an HP 3580A yet, I'd like to buy it, before it goes to trash.Shipping to Switzerland shouldn't be too expensive as well.
New Hantek 4048 wont STFU !! - Page 1
Forum section: electronics / testgear

author: patrick1
author_rank: Contributor
timestamp: July 20, 2019, 05:56:09 pm
content: this thing dosnt bother me at measuring 100+hz signals,but when i turn the measure rate up too 100ms / 500ms /- 1s. it starts flashing "ARM" in red, at the top left, and does it for about 3 seconds every 5 seconds. .. and when this is occurring, the scope just jams up, ... like the trace stops dead. pain in the ass.ive searched the forum, .. was some similar sounding issue, but difference scope and solution. - really weird.

author: patrick1
author_rank: Contributor
timestamp: July 21, 2019, 08:23:09 pm
content: bump hantek scopes are cheap.but still my most expensive evermy UNI-t 2 channel digi was onl ylike $350, 10 years ago, and i used it on tesla coils !!! dual MOT badboys !!

author: ebastler
author_rank: Super Contributor
timestamp: July 21, 2019, 08:59:05 pm
content: I think this is normal behavior. When you set the acquisition scan speed to a slow 1s per division, the scope will need several seconds to capture its default 5 or 6 divisions of pre-trigger history. You won‘t see anything happening during that time.Move your trigger point towards the left side of the screen, or switch the display to„role“"roll" mode if the scope offers that, for better handling at these slow scan rates.

author: tautech
author_rank: Super Contributor
timestamp: July 21, 2019, 09:59:06 pm
content: Quote from: patrick1 on July 20, 2019, 05:56:09 pmRoll mode, nothing displayed until the sweep acquisition is complete, normal behavior for a DSO.

author: patrick1
author_rank: Contributor
timestamp: July 22, 2019, 08:02:00 pm
content: wow thats guys, my old digital scope is nearly 10yo. which has a very slow moving trace.but you are correct, - this one just buffers the information, and appears too jam up. before displaying it.haha ... amazing i didnt understand that... so simple lol thankyou !!
Siglent SHS806 stuck at boot screen - Page 1
Forum section: electronics / testgear

author: Daruosha
author_rank: Regular Contributor
timestamp: July 02, 2019, 06:10:24 pm
content: I bought a used Siglent SHS806 handheld oscilloscope and when I try to turn it on, it freezes at boot screen just like the video 8n the link down below:https://youtu.be/gvidRXNwZVwI've seen one of Dave's videos which he recovered a Siglent arb gen by flashing a new firmware using an SD card.It's a very nice looking and rigid peice of kit and really want to fix it. Anyone has a clue or somewhat experience with this scope?@tautech: Would you please help?Appreciate any help in advance.

author: mcinque
author_rank: Unknown
timestamp: July 02, 2019, 07:33:15 pm
content: did you bought it in this non-working condition? or it was for sale as "used" only?did you contact siglent about this issue (maybe it's a known problem)?

author: Daruosha
author_rank: Regular Contributor
timestamp: July 02, 2019, 08:00:22 pm
content: It was listed as non-working. However I remembered it was a common issue in Siglent devices (which it was), and even explained it to the seller (didn't want to rob him).

author: tautech
author_rank: Super Contributor
timestamp: July 02, 2019, 08:41:44 pm
content: Quote from: Daruosha on July 02, 2019, 06:10:24 pmI'll try.By PM tell me where you are and maybe share your email with me.

author: mcinque
author_rank: Unknown
timestamp: July 02, 2019, 10:25:47 pm
content: Quote from: Daruosha on July 02, 2019, 08:00:22 pmInteresting, I'd like to know more about this issue. Please, keep the thread updated.

author: tautech
author_rank: Super Contributor
timestamp: July 03, 2019, 07:47:02 am
content: Email to Daruosha sent with short video and small doc explaining the recovery process ....much like the Math, Math, Math key presses used in other equipment.Small doc attached. (thanks tech support for prompt reply.)

author: kosomsk
author_rank: Regular Contributor
timestamp: July 22, 2019, 09:00:36 pm
content: Quote from: Daruosha on July 02, 2019, 06:10:24 pm99% need firmware dump from working scopehttps://www.eevblog.com/forum/repair/try-to-find-siglent-shs806-oscilloscope-firmware-(dump)/
Info on Keithley analog nanovoltmeter models 147 148 149 - Page 1
Forum section: electronics / testgear

author: gbaddeley
author_rank: Regular Contributor
timestamp: July 22, 2019, 08:54:39 am
content: Hi everyone,I have pulled a Keithley 147 and a 149 out of my old test equipment storage.Manuals are available on the 'net, but does anyone know when they were in production?The 149 seems to be early 1960's. The 147 (and its 148 partner) seem to be late 1960's through to early 1980's.Also, when did the 147 / 148 change from a 2 stage tube front end to a 2 stage FET front end?My 147 has early 1976 date codes on components and is FET front end.It looks like Keithley retained the main PCB with traces for the 2nd stage tube, and put the 2 stage FET front end on a little PCB in the shielded input compartment.Cheers, Glenn.
MSI Electronics Model 563 1MHz Capacitance Meter - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: July 22, 2019, 05:54:05 am
content: I have had this MSI Electronics Model 563 1MHz Capacitance Meter on the shelf for more than 15 years. When tried it a few months ago it did not work, so yesterday I decided to try to fix it, even though I do not have a manual.If you have a manual for this please post here or message me. I would love to have a PDF.From what I can tell besides a couple of models of CV meters MSI Electronics also made varactor diodes.So I opened it up and did a visual inspection including the power supply capacitors, since "it’s always a capacitor" and found these two 20µF 250V capacitors in the high voltage supply.The closest thing I had in stock were 40µF 500V caps that were much larger, but fortunately there was ample room in the case so I was able to make them work.I then cleaned the selector switch with IPA (isopropyl alcohol) andDeoxIT. The BNC and internal connectors all looked pristine so I elected to leave them be.Here is the inside with the power supply board removed. You can see the oversized capacitors I installed. I insulated the leads before installation and glued the two capacitors to together. With the four disperse solder joints and the caps glued together it seems mechanically stable.This is again looking toward the rear of the unit, but with the power regulator board in place.This is looking toward the rear side of the front panel.This is a view of the inside bottom with and without the shielding plateAfter the repairs I tried it out with some 1% capacitors and it was right on. I checked capacitor bias dial it was right on from -99.9V to +99.9V, including 0V measuring 0V.So I assembled and connected it a Boonton test test fixture and measured some diodes.I then connected my function generator to the external bias input port and switched the mode to external. I also connected my scope to the C output port.I used this set up to measure the capacitance vs. Voltage characteristics of some diodes and rectifiers I had sitting in my bench junk box including this switching diode measurement.The labeled ranges seem to be a limitation of the 2V, 2000 count panel meter. The output to an external meter or scope actually works up to more than 12V so the ranges for external instrumentation are:2pF --> 12pF20pF --> 120pF200pF --> 1200pF200pF --> 1.2nFI am happy with the meter and the repair. It seems to work great, however it would still be nice to have a manual.. . Chrisp.s. you can see full sized tear-down and repair images by clicking on some of the images in this post!
GW Instek GOS-620 Bottom stand rubber - Page 1
Forum section: electronics / testgear

author: yustech
author_rank: Newbie
timestamp: July 21, 2019, 12:07:46 pm
content: Hello friends, I just bought a old cheap scope but missing standing legs. Does any friends know where I can buy the legs. Help.Thanks you in advance good and kind people of this EEVBLOG site.
Rohde&Schwarz Oscilloscope - Remote Operation - Page 1
Forum section: electronics / testgear

author: KennethKNielsen
author_rank: Newbie
timestamp: February 23, 2018, 08:02:04 am
content: Hello everyone,I am new on this forum and just by a quick scan of the topics discussed here, I believe I will be here for a whileI have been trying to find a program for my Rohde&Schwarz RTO 1024 oscilloscope that is equivalent to Xviewer that I have for my Yokogawa scopes. A program where I can control the scope remotely with a computer, extract data and all that. I have tried the RScommander, but it doesn't really do it for me, aswell as the VNC webserver client. Can someone recommend something or am I stuck with these options?I hope you can help. ThanksKind regardsKennethDenmark

author: carvalhoatx
author_rank: Newbie
timestamp: July 21, 2019, 04:29:10 pm
content: hi Kenneth, still working with it? If so, let me know. REgards, Carvalho.
Burster digistant 6425 T  (current source) teardown and repair. - Page 1
Forum section: electronics / testgear

author: The Soulman
author_rank: Super Contributor
timestamp: June 19, 2019, 06:38:49 pm
content: This little current source has been acting up for some time, occasionally it would produce lower current with tremendous amounts of noise, a little mechanical persuasion would usually fix it but now I have enough of it and had a proper look at it.From the outside I could narrow it down to the external/internal v-ref switch on the back.After opening up the digistant I spotted the culprit, can you?It have been like this for forty years.Apart from the defect and one of the resistors on the second decade being out of spec, it is a handy little thing.Pics attached for your entertainment.

author: The Soulman
author_rank: Super Contributor
timestamp: June 19, 2019, 06:57:43 pm
content: Some more info:Output range: 0,001 mA to 110mA (first dial goes up to ten, others up to nine)Maximum output voltage: 20 VMaximum error: 0,03%Op-amps: 3) ua741, 1) LH0042Zener: unknownPrecision resistors: Burster in various grades

author: Dr. Frank
author_rank: Super Contributor
timestamp: June 19, 2019, 09:33:22 pm
content: thank you for these pictures!Always loved Burster resistors, built many CC sources out of them...That lead coming from the switch, left under that 100M resistor did never see a solder joint, for as much as 42 years, obviously.Frank

author: Vgkid
author_rank: Super Contributor
timestamp: June 20, 2019, 10:42:02 am
content: Thanks for the teardown. It is always interesting to see inside various precision current sources. They are always aimple.Did you find a schematic for it.

author: The Soulman
author_rank: Super Contributor
timestamp: July 21, 2019, 11:33:55 am
content: One of these days it is coming apart again, the rear switch is still a bit dickey, anyone wantsome pics of anything specific?
Digimax D612 Frequency Counter problem - Page 1
Forum section: electronics / testgear

author: madd0c
author_rank: Newbie
timestamp: July 16, 2019, 02:15:16 am
content: Hi, long time lurker on this forum. I made an account to get some help with this.I bought a Digimax D612 frequency counter on ebay which is from the mid 1980s. It worked great for several weeks. Then I made the mistake of soldering with a metcal soldering iron on part of a circuit under test. Metcal uses rf heating and I think it must have fried something in the frequency counter.The frequency counter has a direct input for 50Hz to 50Mhz and a prescaled input for 10Mhz to 1.2 Ghz. Both 20V P2P RMS inputs.After my mistake, the frequency counter functions fine in the prescale input (10Mhz to 1.2Ghz) and functions fine ABOVE 3Mhz in Direct input mode. The interesting thing is it is not a blown capacitor or resistor, because the direct input functions fine above 3Mhz (yes I replaced them even though they tested good,no change). Anything below 3Mhz and the counter doesn't register it at all even with a 5v signal from a digital signal generator.The schematic is included in the operators manual here:https://elektrotanya.com/digimax_d-1200_frequency_counter_operators_manual.pdf/download.htmlI have traced the signal with an oscilloscope thorough the direct input to the MPF102(Q7) and it is fine to that point. I have an NTE457 replacement for the MPF102 on the way as I think that must be the problem, but I can not figure out why it would only effect signals BELOW 3 Mhz.Does anyone have any ideas why the only thing effected is the counts below 3Mhz when it works fine above that?Any help would be appreciated. Thanks!

author: edavid
author_rank: Super Contributor
timestamp: July 16, 2019, 03:48:43 am
content: C9 could be bad or the wrong value, or the 3MHz signal may couple through the MPF102's gate-drain capacitance, even if it's not functioning as an amplifier.

author: madd0c
author_rank: Newbie
timestamp: July 16, 2019, 04:36:29 am
content: Thanks for taking a look. C9 tested good, but I replaced it anyway with a known good part. It is correct .02uf value.As for coupling, that may be why the signal dissapears at the MPF102. Will know more when I get a replacement for that part in, but that makes sense. I suppose that would explain why it counts properly at the higher frequency. That is to say I can measure and display a 3.455 Mhz signal properly , but not a 455Khz signal.Thanks for the input!

author: madd0c
author_rank: Newbie
timestamp: July 20, 2019, 12:03:11 am
content: If anyone is interested, replacing the MPF102 fixed the issue, so it must have been capacitively coupling above 3Mhz.This is just an update for anyone who searches on how to repair a D612 with this issue.Also anyone searching about Metcal soldering irons and damage to RF/UHF JFETsThanks!
BM869s protection in diode mode? - Page 1
Forum section: electronics / testgear

author: Noy
author_rank: Frequent Contributor
timestamp: July 19, 2019, 08:15:32 pm
content: Hello,I measured with my multimeter BM869s (only half a year old ... :-() a diode and after that the output of a working PFC (420V)Since it has sparked briefly, I have looked at the setting of my multimeter and thought: "Shit forgot to switch"I checked voltage and current mode with a DMM Check Plus and against my Fluke 8840A its still working fine.Diode mode and capacitor mode seem to work also. But i have no idea how I can verify the readings there, at least in diode mode. Does anyone have an idea? A chinese LCR meter and the cheap transistor tester is available for testing ...Does anyone know how the diode mode is normally protected within multimeters? Possibly even in my model?I've looked at the circuit diagram of the 121GW at least one PTC is installed there ...

author: exe
author_rank: Unknown
timestamp: July 19, 2019, 08:19:21 pm
content: From what I saw in @joeqsmith videos, all input and ranges should be protected.How you can verify diode mode: just measure diode, hook in parallel another DMM to verify they show the same dropout voltage.PS may be this video will be helpful:

author: Noy
author_rank: Frequent Contributor
timestamp: July 19, 2019, 08:30:38 pm
content: I do nott have another dmm with diode mode. The Fluke measures diodes in Ohm, so no forward voltage...Maybe i will find my old uni-t. But i do not know if it has diode mode.

author: exe
author_rank: Unknown
timestamp: July 19, 2019, 09:01:48 pm
content: Connect your fluke in parallel in voltage mode.

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 19, 2019, 09:24:03 pm
content: Should diode measurements between different multimeters read the same if they're calibrated and reading properly? From what I understood, you can get different readings depending on the design of the multimeter (different current put through the diode)? Or is there a current standard? Pun intended.

author: Noy
author_rank: Frequent Contributor
timestamp: July 19, 2019, 09:30:24 pm
content: @exe good idea. I did not think about that right now. Will try this.

author: MosherIV
author_rank: Super Contributor
timestamp: July 19, 2019, 10:49:02 pm
content: Do not worry too much about it. Dmm like these are properly designed and can take the sort of abuse.You can check the diode check by a) in diode check setting, short the leads together, the meter should read 0V, b) get a diode measure the diode in both directions - one direction should read the forward V drop (0.7V) the other direction should read open. If this works, your dmm is ok.
Oscilloscope & Multimeter Combo - Page 1
Forum section: electronics / testgear

author: Saitama
author_rank: Contributor
timestamp: July 14, 2019, 08:12:10 pm
content: Hello!I am a beginner, saved up 100USD and now I want to buy an Oscilloscope and a multimeter.I found one multimeter on a local Electronics shop: Sinometer DM88 (https://dac.ge/?en&act=product&prodid=2097) I know it's a Chinese brand, but should I buy it? It costs only 28$.I can buy it online from Ebay or Amazon.Which oscilloscope and multimeter should I buy?Edit: I got 20$, so now I have 120$ in total

author: tunk
author_rank: Super Contributor
timestamp: July 14, 2019, 08:57:33 pm
content: You can get a Hantek 2C42 DSO/DMM-combo from around 110us$.

author: Fungus
author_rank: Super Contributor
timestamp: July 15, 2019, 07:50:20 am
content: Quote from: Saitama on July 14, 2019, 08:12:10 pmFirst question: What do you need to measure/look at?

author: Saitama
author_rank: Contributor
timestamp: July 16, 2019, 04:07:41 pm
content: Some basic waveforms like square, sawtooth and sine, but I would like to measure their voltages and current at different sections.

author: Fungus
author_rank: Super Contributor
timestamp: July 16, 2019, 04:16:09 pm
content: Quote from: Saitama on July 16, 2019, 04:07:41 pmWhat frequencies? How many volts?

author: Saitama
author_rank: Contributor
timestamp: July 16, 2019, 07:05:02 pm
content: >200Khz and >120V

author: tunk
author_rank: Super Contributor
timestamp: July 18, 2019, 12:22:06 pm
content: Here's a short intro/review of cheap scopes:https://translate.google.com/translate?sl=auto&tl=en&u=https%3A%2F%2Fwww.ixbt.com%2Flive%2Finstruments%2Fvybiraem-byudzhetnyy-karmannyy-oscillograf.html
HP 16532A scope plugin for LA - Page 1
Forum section: electronics / testgear

author: woodchips
author_rank: Frequent Contributor
timestamp: July 10, 2019, 12:10:30 pm
content: Seem to have acquired some old HP logic analysers. Not going to use them as analysers but one mainframe had a 16532A DSO plugin card.Seems to be much faster than any other DSO I have, the question is, is it usable outside of the LA mainframe? The mainframe is huge, don't want to use it inside. Is it the same acquisition card as used in any of the dedicated DSO's?Thanks.

author: swingbyte1
author_rank: Contributor
timestamp: July 10, 2019, 03:24:40 pm
content: Not as far as I know. Some of the chips are common across the DSO and la systems but all of the control and processing is done in the mainframe. You can try to hack something if you want to decipher the control signals but there's not much data on these later productsSent from my Nexus 5 using Tapatalk

author: woodchips
author_rank: Frequent Contributor
timestamp: July 10, 2019, 06:20:05 pm
content: Thanks.Did think that, but worth asking anyway.Another for the scrap bin.

author: MadTux
author_rank: Frequent Contributor
timestamp: July 12, 2019, 09:22:11 am
content: Any possibility of me buying that card?Or perhaps a mainframe full of cards?

author: woodchips
author_rank: Frequent Contributor
timestamp: July 12, 2019, 05:04:45 pm
content: Can do, where are you?The mainframe is very heavy but the cards aren't too bad, unless international.No idea if they work! Didn't bother to try the analysers.

author: woodchips
author_rank: Frequent Contributor
timestamp: July 12, 2019, 05:26:07 pm
content: Just looked, got the following cards:68000 CPU16510B16515A16520A16550A16532AThe test leads are pretty poor condition, might not be worth the cost of shipping.

author: MadTux
author_rank: Frequent Contributor
timestamp: July 12, 2019, 07:17:06 pm
content: Im in Switzerland, anything newer than the 16500A sometimes sells for good money over here.70$+shipping for 16500 B/C mainframe fully loaded?https://www.ricardo.ch/de/a/hewlett-packard-hp16500a-1067630480/

author: woodchips
author_rank: Frequent Contributor
timestamp: July 17, 2019, 05:20:05 pm
content: No, not worth the hassle for that, thanks for the offer though.
Cheap VNAs? - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: July 16, 2019, 12:54:56 pm
content: Are there any cheap vector network analysers that actually work?"Cheap" being like max 3-400 usd.Intended purpose would be things like improving Z match up to maybe 100 MHz.

author: hendorog
author_rank: Super Contributor
timestamp: July 16, 2019, 01:05:02 pm
content: NanoVNA is the best option for that price and frequency range IMHO.Edit: I misread the price range, this VNA is around $50 so there may be better options for $400These are available in lots of places, this is just a random one I found.https://www.ebay.com/itm/NanoVNA-Vector-Network-Analyzer-HF-VHF-UHF-Antenna-Analyzer-2-8-TFT-Screen/202734684273?hash=item2f33edc871:g:bWUAAOSwnoldLTcoGoogle group is herehttps://groups.io/g/nanovna-usersThe white gecko labelled ones lack shielding. Mine is like this.Some of the black ones are properly shielded and also apparently have a slightly better PCB layout.This is more important over 300MHz where they are operating on harmonics of the LO. Below 300MHz any of them will be OK I expect.

author: DaJMasta
author_rank: Super Contributor
timestamp: July 16, 2019, 03:14:04 pm
content: Can you deal with just one port and no transmission measurements? There are a number of antenna analyzers that can be had for that budget and frequency range if you're only looking for single port measurements.

author: Datman
author_rank: Regular Contributor
timestamp: July 16, 2019, 11:22:19 pm
content: https://www.ebay.com/itm/NEW-50KHz-900MHz-Vector-Network-Analyzer-Kit-MF-HF-VHF-UHF-Antenna-2-8-Screen-H/183848389844
Advantest R3265 M manuals, options and specs - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: July 16, 2019, 08:07:37 pm
content: Hi;I'm looking at getting a R3265M, it has options 6, 15 and 71. Does anyone have any info on the differences from a R3265A and what are the options?I have downloaded the R3265A manuals from Advantest and the spec sheets, nothing jumps out at me though.Greatly appreciate the help!!
Rohde & Schwarz HM8123 - Page 1
Forum section: electronics / testgear

author: TRN
author_rank: Unknown
timestamp: February 15, 2019, 10:53:23 am
content: Hi,I recently purchased a second hand HM8123-X, and would like to know where I can get firmware updates and the calibration procedure.I contacted Rohde & Schwarz but they are not willing to assist me because I am a Private person, they gave me however the contact details from a calibration lab in Germany.When I contacted the lab with the same questions, they referred me back to Rohde & Schwarz.Seems like I am running around in circles

author: tautech
author_rank: Super Contributor
timestamp: February 16, 2019, 12:28:58 am
content: PM Rich @ R&S and point him here to this thread:https://www.eevblog.com/forum/profile/?u=133086

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: February 16, 2019, 10:52:36 pm
content: Quote from: TRN on February 15, 2019, 10:53:23 amThanks Tautech.TRN - let me see what I can find out for you and I'll get back to you.-Rich

author: TRN
author_rank: Unknown
timestamp: February 17, 2019, 02:32:34 pm
content: Hi Rich,Thanks

author: josuhp
author_rank: Newbie
timestamp: July 16, 2019, 01:41:27 pm
content: Hello everybody,I am in the same condition as you. I purchased a used HM-8123 in an excellent condition but it needs to be calibrated. As the original manual says, if you want to calibrate it, you can ask to R&S to get the calibration procedure. I did it, I contacted to R&S Spain, and I get no response about how to do it.I am still waiting.I would be very pleased if you could help me to get the information to calibrate it.Many thanksJosu
System restore in modern test gear - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: July 16, 2019, 12:06:04 pm
content: I saw someone mention that the Siglent SDG2042X could have its system "recovered from u-disk" if it somehow started behaving erratically.Can the same be done for Siglent's oscilloscopes, multimeters and other instruments controlled by small computer boards running linux?Wouldn't it be even better if you could do a proper backup of all the stored data in the instrument and do a complete restore? So one could save away a known useful and working state?
TiePie Handyscope HS6 DIFF - Page 1
Forum section: electronics / testgear

author: tv84
author_rank: Super Contributor
timestamp: July 19, 2019, 11:21:58 am
content: Hi,TiePie Handyscope HS6 DIFFHas anyone tested/used one?Any opinions/thoughts you might want to share?And what about the "CMI interface" software that allows combining multi scopes?TIA
Rigol 832 vs 832A differences - Page 1
Forum section: electronics / testgear

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: July 04, 2019, 12:49:06 pm
content: After browsing the web for some time it seems to me that they are identical in hardware except for the more colorful scheme on the exterior front panel of the 832A model.It is my understanding that the 832 can be hacked to match the exact functions and specifications of the A model so why would one pay an extra 200$ or more to get it?I love the styling of the 832A and would actually consider paying 100$ extra for the different design however the actual cost seems exaggerated for the same hardware.Am I missing something here? Should I just get the 832 and be done with it?

author: maginnovision
author_rank: Super Contributor
timestamp: July 04, 2019, 01:29:27 pm
content: Yes, just get the 832 and be done with it.

author: ted572
author_rank: Frequent Contributor
timestamp: July 07, 2019, 11:11:01 am
content: Hello drummerdimitri:See ->https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/msg2320485/#msg2320485And in 5 or 10 minutes you can have a DP832A (with full color) from a less expensive DP832. I made simple step by step notes on doing this from the info there and it was easy. I sent the SCPI command via USB using EEVbloger 'PeDre'Messinstrumente(Measuring instruments - program for data transfer and control) which is very easy and fast. Good luck and you should be able to do this quickly from the info in the link above. Its all there! 'tossu' with 'volkimel' and 'tv84' are a 'Top Shelf Team' for sure.Edit:By request, here is a English link to'Messinstrumente'(Measuring instruments - program for data transfer and control) ->https://translate.google.com/translate?hl=en&sl=de&u=http://peter.dreisiebner.at/messinstrumente/index.htm

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: July 07, 2019, 03:48:13 pm
content: Thanks for the help.One more question before I pull the trigger: Can I get a mAh and/or Wh reading in conjuction with the power reading?

author: JxR
author_rank: Unknown
timestamp: July 07, 2019, 04:02:44 pm
content: Quote from: drummerdimitri on July 07, 2019, 03:48:13 pmHaving previously owned one of these power supplies for a few years, I can tell you that the DP832(A) does not provide this as far as I'm aware. Your only option would be to log the data over time and do the calculations yourself. Almost no power supplies provide this information built in, and I have only seen it on a couple of models.

author: ted572
author_rank: Frequent Contributor
timestamp: July 15, 2019, 08:57:05 pm
content: Seehttps://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/msg2540175/#msg2540175for a picture of aDP832conversion to aDP832A.
strange values when manual range selecting the Fluke 187 capacitance measurment - Page 1
Forum section: electronics / testgear

author: vinyl
author_rank: Newbie
timestamp: July 15, 2019, 02:28:55 am
content: Hi.When my fluke 187 selects the capacitance measurment mode manual range(only on 100uF and 1000uF), it reads strange values with the lead open.lead openManual Range 100uF 2.0uF1000uF 16uFIs this normal?lead open manual range pictures.

author: MosherIV
author_rank: Super Contributor
timestamp: July 15, 2019, 07:12:35 am
content: Yes. Mine does that as well.

author: vinyl
author_rank: Newbie
timestamp: July 15, 2019, 08:02:30 am
content: Thank you. MosherIVThe other 187 is doing the same thing, so I don't think it's a DMM fault.Lead open statusIt is normal to read very small values (0.067nF) at the manual range 1nF and 10nF, but it is difficult to understand that only the 100uF and 1000uF ranges are strange values.Five hyphens are displayed in other manual ranges (lead open 1uF, 10uF, 10mF, 50mF).
Flir i7 upgrade? - Page 1
Forum section: electronics / testgear

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: July 13, 2019, 10:42:25 pm
content: I've my Flir i7 thermal imager for a while now and I'm looking to get a thermal imager with higher resolution/sensitivity as well as video capturing capability.I was wondering if the Seek Shot pro would be a worthy upgrade as the price is reasonable and the form factor is attractive.Will be using it mostly for electronics/electrical testing.
Hantek 6022BE vs OWON VDS1022 - Page 1
Forum section: electronics / testgear

author: Saitama
author_rank: Contributor
timestamp: July 13, 2019, 05:03:01 pm
content: Hello!I will make this short and simple.Should I get Hantek 6022BE or OWON VDS1022

author: Gyro
author_rank: Super Contributor
timestamp: July 13, 2019, 06:50:04 pm
content: In a straight race between the two of them and in the absence of any intended usage information, the VDS1022, no question. Spend a few (currency of your choice) more and get the VDS1022I (USB Isolated version), your computer will thank you one day.https://www.eevblog.com/forum/testgear/owon-vds1022i-quick-teardown-(versus-the-hantek-6022be)/
Weird memory of Fluke 24/FM - Page 1
Forum section: electronics / testgear

author: kamcm
author_rank: Regular Contributor
timestamp: July 13, 2019, 05:11:50 pm
content: We all know that it's Fluke 27/FM.but I have a weird memory that it use to be Fluke 24/FMI knew it sounds crazy. Just wonder to know if anyone also found Fluke 24/FM sounds Familiar?
GPIB logging in real-time? - Page 1
Forum section: electronics / testgear

author: mindcrime
author_rank: Unknown
timestamp: July 13, 2019, 03:47:58 am
content: Hi all, apologies for what is probably a very n00bie'ish question, but... well... I'm pretty new to this particular topic.Here's the question... I'm thinking of buying a used standalone logic analyzer, something like an HP 1660A. These things are too old to support Ethernet / LXI, so it looks like the cleanest way to get data off the system is probably the GPIB interface. I see there are GPIB to USB interfaces modules, and Linux has driver support for the one I'm looking at, so I don't *think* that getting data off the analyzer itself - in general - will be an issue. But not being at all familiar with GPIB, I am wondering if you can receive the data as a stream in real-time (or "near-time" as it might be) for logging? Or are you limited to doing a run, having it captured to the analyzer's internal memory, and then downloading it in batch fashion?Thanks!

author: gslick
author_rank: Frequent Contributor
timestamp: July 13, 2019, 04:14:07 am
content: An HP 1660A does not have an Ethernet interface. An Ethernet interface is optional on the 1660C, and standard on the 1660E. An Ethernet interface is standard on the 1670A, 1670D, 1670E, and 1670G.But regardless of how you interface to any of the classic HP/Agilent and Tektronix style logic analyzers before USB attached logic analyzers came along, they all operate in the run and capture into very fast but limited capacity analyzer module memory, then stop and analyze modes. Even 20 year old HP logic analyzers can acquire data way faster than could be streamed in real-time over Gigabit Ethernet.

author: mindcrime
author_rank: Unknown
timestamp: July 14, 2019, 07:14:40 am
content: OK, I figured it would be like that.
Megger AVO835 review, what do you want to see?  - Page 1
Forum section: electronics / testgear

author: Perrin21
author_rank: Regular Contributor
timestamp: July 09, 2019, 10:25:11 am
content: I will be getting an AVO835 multimeter to unbox and review, is there anything you would like to see? this meter has intreagued me for a while, firstly I think it has an attractive design and I'm a fan of high build quality and am curious how it compares to my new Brymen 869s. let me know if there is anything specific you want me to test and I will try my best. unfortunately I do not have a bench power supply to test with yet so for now it will be simple tests and hopefully a look inside.

author: Perrin21
author_rank: Regular Contributor
timestamp: July 12, 2019, 11:41:23 am
content: This meter is also capable of capacitor discharge which could be an interesting feature to test.

author: SG-1
author_rank: Regular Contributor
timestamp: July 13, 2019, 12:30:21 am
content: I would be interested in:The bar GraphAC+DC Mode (door bell transformer & battery)Ampere Measurements in the 0-20mA DC rangeLo-Z FeatureCap Discharge FeatureBack LightAC Voltage DetectionNone Contact Voltage DetectionMin/Max/Average
Anritsu 800-441 Serial Interface cable pinout - Page 1
Forum section: electronics / testgear

author: Fortland21
author_rank: Newbie
timestamp: July 12, 2019, 11:44:46 pm
content: Hello, if anyone knows where I can find the pinout diagram for Anritsu 800-441 serial interface cable (null modem) I would pretty much appreciate it!Thank you all!
battery site master s331c - Page 1
Forum section: electronics / testgear

author: pe2ben
author_rank: Contributor
timestamp: July 11, 2019, 11:04:08 am
content: Hello,I have buyed a new battery for my Site Master S311C (DR-15).Charging with the battery inside the S331C works and the unit powers up.But the software recognised the battery not. The unit with onlyI also performed 3 times a ful charge and uncharge.Is there a way to solve this?Regards Ben PE2BEN

author: Simon
author_rank: Unknown
timestamp: July 11, 2019, 12:05:10 pm
content: You mean there is not charge level indicator or something?

author: pe2ben
author_rank: Contributor
timestamp: July 11, 2019, 12:16:33 pm
content: Yes,No communication with the battery (no battery inserted and no charge level) but i can start the s331c with only the battery.Regards Ben

author: Black Phoenix
author_rank: Super Contributor
timestamp: July 11, 2019, 12:28:09 pm
content: Probably the battery needs calibration:

author: pe2ben
author_rank: Contributor
timestamp: July 11, 2019, 01:33:55 pm
content: Hello Black Phoenix,This calibration procedure is what i tried several times without a solution (until now).How many times do i have to run this procedure (until now i run it 3 times) ?Regards Ben

author: Black Phoenix
author_rank: Super Contributor
timestamp: July 11, 2019, 01:39:56 pm
content: Well if you run it 3 times and still nothing appears in the screen, then probably some monitoring IC on the battery pack that also supports temperature if the equipment itself registers, is missing or damaged.Or probably I will let to others more knowledgable of the subject to reply.