hybridfree/eevblog-posts huggingface dataset:
Hewlett Packard 53132A restoration - Page 1
Forum section: electronics / testgear

author: MaxFrister
author_rank: Regular Contributor
timestamp: December 11, 2019, 11:13:45 pm
content: I recently purchased a 53132A from that awful “auction” site. It was listed as for-parts but was mostly functional. The only problems I’ve located thus far are a burnt 50-ohm termination resistor and a somewhat dim display.It is interesting the history you can deduce from the vfd wear on a machine. This machine lacks a high-stability timebase and was not run from a house frequency standard. (I’m not sure what the point of having a 12-digit machine running on the base-level timebase.) It spent most of its life measuring frequency on channel 1. The input was connected and disconnected enough to show wear on the bnc.I expected to have to change the fan (these fans run even in standby power), but it is quiet enough to not be a bother even in a quiet lab. I run most of my machines via a master ac switch so the machine will not be powered all the time.The machine is circa 1994. The firmware differs in mostly minor ways from the later versions. I was not planning to update it until I tried using the machine. The newer firmware separates the digits using commas to the right of the decimal point. That turns out to be a useful feature when contending with 12 or so digits.The original eprom chips are 27C010 (one-time writable). I replaced them with 29F010-120ns plcc flash.Does anyone have any experience with the Chinese 53131/53132 VFD replacement displays?

author: martinr33
author_rank: Frequent Contributor
timestamp: December 12, 2019, 03:18:30 am
content: I've been very happy with VFDs off of Taobao. They look just like the originals when running. The China price can be better than the eBay price (because the eBay price can go up).The newer firmware requires a precision recal, so be ready for that.

author: kj7e
author_rank: Frequent Contributor
timestamp: December 12, 2019, 03:35:16 am
content: Fan replacement;https://www.eevblog.com/forum/repair/hp-53132a-fan-replacement/Display replacement;https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg2696306/#msg2696306This is the replacement VFD I bought, could not be more happy with it.https://www.ebay.com/itm/1PC-NEW-HP-Keysight-Agilent-53131A-53132A-VFD-Display-Counter/173868447306?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

author: DeepLink
author_rank: Regular Contributor
timestamp: December 15, 2019, 12:28:33 pm
content: Make sure to replace all the electrolytic capacitors on the Delta power supplyI recently got hold of an old 53131A, where the fan was noisy and all the capacitors was leakingA good clean up, some new electrolytic caps and a new fan. Then it was running again
Service Manuals for Datron/Wavetek 4808 Multifunction Calibrator - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: August 20, 2018, 03:02:26 pm
content: I've just uploaded OCRed scans of the service manuals for the Datron 4808 to groups.io:Part 1 Theory of Operation and Maintenance Procedures is in the Maintenance Handbookhttps://groups.io/g/Datron-Wavetek/files/Datron%204808/Datron%20Wavetek%204808%20Multifunction%20Calibrator%20Maintenance%20Handbook.pdfPart 2 Schematics, Assembly Drawings and Parts lists is in the Reference Handbookhttps://groups.io/g/Datron-Wavetek/files/Datron%204808/Datron%20Wavetek%204808%20Multifunction%20Calibrator%20Reference%20Handbook.pdfI have an early copy of the User's Handbook for the 4800A, 4805 and 4808 calibrators, but it is incompleteso I suggest that you get a good scan of that which includes the Routine Calibration instructions from Artek Manuals:http://artekmanuals.com/manuals/other-manuals/All the bestDavid Partridge

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: August 20, 2018, 03:23:20 pm
content: David,Thanks for posting this. They will come in handy for my next repair project.

author: nikonoid
author_rank: Regular Contributor
timestamp: August 28, 2018, 03:17:08 am
content: Thank you, David. This is awesome!

author: perdrix
author_rank: Frequent Contributor
timestamp: December 15, 2019, 07:25:14 pm
content: For some reason I neglected to OCR the Maintenance Handbook. So, I just OCRed it and re-uploaded it to the Datron-Wavetek group files area.David
Issues about SMU200A repairing - Page 1
Forum section: electronics / testgear

author: Dynamix
author_rank: Newbie
timestamp: December 11, 2019, 01:27:59 am
content: Hi,My SMU200A generator can't properly power up these days. The green LED is on after pushing the power button, but the screen doesn't show up. Does anybody have a clue about it?I have found the service manual for a long time but found nothing besides the operation manual. Does anybody have a service manual?Thanks!

author: DaJMasta
author_rank: Super Contributor
timestamp: December 11, 2019, 01:45:47 am
content: Not exactly the right forum for it, but I can maybe point you in a reasonable direction from working on some similar vintage R&S stuff.It's a windows based unit and the motherboard is under the screen unit, you'd need to take off the front faceplate, then remove the screen/keypad to get at it, though the hard drive is actually in the body of it (comes off with screws in the back feet).Is the instrument booting? Can you get any output on the rear VGA connector? Do you hear any relay clicks from alignment if you wait a while for it to start?Could be that the screen backlight is dead or the screen cable is unplugged. could be that the mainboard is bricked, could be something else. If it was just an OS/hard drive issue then you'd probably at least get the bios screen on the front panel. If nothing's turning on, maybe the cable to the front panel has been slightly unseated (the lights and power button still go through it, though), could be power supply related with the rest of the instrument.Not a lot of detail to go on and it's modern enough that you shouldn't expect a service manual any time soon - R&S may still be able to happily service it for you for a few grand....

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: December 14, 2019, 08:12:54 pm
content: Hello,there is a service manual avaiable. You need a Rohde & Schwarz Gloris account to get access to it.https://gloris.rohde-schwarz.com/anonymous/en/pages/toplevel/home.html?The easiest problem could be a broken screen backlight. If i remember correctly it still uses a ccfl backlight. They are likely to fail. The service manual advises to measure the mainboard voltages if the green light turns on but the screen remains dark.
HP 3467A Multimeter DOA - Page 1
Forum section: electronics / testgear

author: jgrhops
author_rank: Newbie
timestamp: December 14, 2019, 07:26:17 pm
content: Hello everyone,I recently picked up an "as is/parts only" HP logging multimeter on the cheap. The internals are very clean with no obvious signs of problems, however it is completely dead, with no display and no sound of relay action. The few motherboard test points show spot on voltages. There is an 8-pin connector at the top of the A3 (Orange) board which looks like it should have a ribbon cable connected but doesn't. (See attached) Could it be this simple?On the other hand, I can't see where the other end of the mystery cable would connect. Can anyone verify this one way or another? On this connector all the voltages are correct except for the +8 VDC which is way high at +11V.Baby steps! Any thoughts or suggestions greatly appreciated.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 14, 2019, 07:39:03 pm
content: The pin header looks more like a set of test points. This could be for production testing.

author: wn1fju
author_rank: Frequent Contributor
timestamp: December 14, 2019, 07:57:32 pm
content: I have a working HP 3467A. There are no cables to that header, nor are there any other cables going to the individual boards.Reseat all the boards, do a visual inspection, check the P/S voltages - the usual stuff.With mine, the problem was the printer mechanism. The cheap plastic gears chew themselves up and it is goodbye printer. It can be fixed, however,somewhat painfully.
New Rigol DS1022z-E scope (no, not the DG1022z AWG!) - Page 1
Forum section: electronics / testgear

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 12, 2019, 03:06:13 pm
content: I don't spend much time looking at entry level stuff but today I found out by accident that there is a new variant of the widely loved DS1054z, just now with only 2 channels but also with 200MHz BW.The new scope is called DS1022z-E:Datasheet:https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-f55c8579-4293-4d7f-aec4-ef7ea08ad8dc/1/-/-/-/-/DS1000Z-E%20Datasheet-EN.pdfI just mention it because I couldn't remember being seen mentioned here at all (and a search for 'DS1022z' comes up with instances where people typo'd 'DG1022z'). Maybe this is old new but if so search didn't reveal anything.So, there you go. Another option for an ultra-cheap scope. If as it looks like it's essentially just a DS1054z with two channels removed then it I'd think it could be a very decent starter scope.

author: borjam
author_rank: Unknown
timestamp: December 12, 2019, 03:21:06 pm
content: Dyslexia...DS1202Z-Ehttps://www.eevblog.com/forum/testgear/new-rigol-ds1202z-e-200-mhz-2-channel-oscilloscope-for-339/msg2758844/#msg2758844There is heavy competition in the low end!

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 12, 2019, 03:26:20 pm
content: Quote from: borjam on December 12, 2019, 03:21:06 pmQuoteNot enough coffeeWell, at least this explains why I couldn't find anything through the search

author: borjam
author_rank: Unknown
timestamp: December 12, 2019, 03:41:33 pm
content: Quote from: Wuerstchenhund on December 12, 2019, 03:26:20 pmIndeed. If you search for Rigol or Siglent and you don't find a bloody flame war of R vs S, you're searching wrong!So it wasn't a paranormal phenomenon.

author: ogden
author_rank: Super Contributor
timestamp: December 12, 2019, 03:58:19 pm
content: Quote from: Wuerstchenhund on December 12, 2019, 03:26:20 pmWhy don't you fix Subject and OP then?

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: December 12, 2019, 04:39:07 pm
content: Mary mother of Jesus, 200MHz! How much more abuse can those poor ADCs withstand?

author: ebclr
author_rank: Super Contributor
timestamp: December 13, 2019, 12:45:07 am
content: For 339 USD is quite nicehttps://www.saelig.com/product/ds1202z-e.htm?Screen=PROD&Product_code=sds1202x-eRIGOL’s new DS1202Z-E 200 MHz, 2 Channel Oscilloscope is available for a special limited time price of $339 until 12/31/2019.

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: December 13, 2019, 12:52:40 am
content: Quote from: Wuerstchenhund on December 12, 2019, 03:26:20 pmAs we gracefully age glasses can help as well
programing FY2300 - Page 1
Forum section: electronics / testgear

author: shorty
author_rank: Newbie
timestamp: August 18, 2018, 10:59:28 pm
content: I would like to be able to upload a file to the FY2300 with a series of of frequencies on each channel to be ran automatically with a time deration. Is there away to do this inthe software that came with it or maybe a third party software. Ive done this before with generators built to do that and thought the FY2300 did that but if it does i cant find anydocumentation on how to do it.Any help would getting be appreciated.ThanksStan

author: f5exo
author_rank: Newbie
timestamp: December 14, 2019, 09:13:41 am
content: Hello everyoneIt is possible to control the DDS generator FY2300 and JDS2600 with the bluetooth module (HC-05) and an Android applicationI managed to find the communication protocol for these 2 products.and developed an application.
Keysight 3000x - Page 1
Forum section: electronics / testgear

author: markus354
author_rank: Newbie
timestamp: December 13, 2019, 06:04:48 pm
content: Hello.Is any one know if is possible to upgrade hardwareFrom MSOX3034A to MSOX3034T?

author: 2N3055
author_rank: Super Contributor
timestamp: December 13, 2019, 07:54:41 pm
content: In short no.
Fluke 10kV connector type - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: December 12, 2019, 09:19:08 am
content: I need to make cable assembly for Fluke 410B and Fluke 80E.In the manuals I found info that the 410B cable part should be equipped with Amphenol MS3106A connector (one pin).Here comes my problem: I'm confused with variety of options in the catalogue.Does someone know exact part numbers of connectors and cable holders ?Or maybe someone has such cable assembly spare?Photo of the HV connector on the 410B instrument.Photo of the HV connector on the 80E instrument.EDIT: found suitable types: MS3106A18-16S (central pin=female) and MS3106A18-16P (central pin=male)
(ask) recommended place to buy zeroplus LAP-C - Page 1
Forum section: electronics / testgear

author: e0ne199
author_rank: Regular Contributor
timestamp: December 08, 2019, 11:28:53 am
content: hello everyone,i am about to buy an original zeroplus LAP-C (16 channels) but i am unsure as to where to buy it...i would extremely prefer to avoid places like e(vil)bay and chinese online shop for this because i have been scammed once on e(vil)bay on my very first purchase on that site and if i want to buy something above 75 dollars from chinese online store, it tends to never arrive to my place, so is there anyone here who can recommend a good place to buy it? any response is appreciated, thx before

author: e0ne199
author_rank: Regular Contributor
timestamp: December 12, 2019, 01:01:12 am
content: i guess no one can answer my question..ok thx everyone

author: Electro Fan
author_rank: Super Contributor
timestamp: December 12, 2019, 03:22:21 am
content: http://www.zeroplus.com.tw/logic-analyzer_en/customer-service_logic.php

author: Lighthammer
author_rank: Newbie
timestamp: December 12, 2019, 06:24:29 am
content: If you are in europe, i bought my LAP-C here:https://www.zeitech.de/

author: e0ne199
author_rank: Regular Contributor
timestamp: December 12, 2019, 07:10:00 am
content: Quote from: Electro Fan on December 12, 2019, 03:22:21 ami have checked some of websites mentioned in there and looks like most of them are not really an online shop, and the rest of them are local online shop which won't accept order overseas..

author: e0ne199
author_rank: Regular Contributor
timestamp: December 12, 2019, 07:11:08 am
content: Quote from: Lighthammer on December 12, 2019, 06:24:29 ami am in Asia but does that website accept order overseas??
Philips PM3350A/3352A/3355/3357/3365A/3367A/3375/3377 - Page 1
Forum section: electronics / testgear

author: BK-Tech
author_rank: Newbie
timestamp: December 10, 2019, 06:13:53 pm
content: Hello all.I`m not good in Englisch, all so i make a Thread for all with this Problem.My Oszi, very good, makes 1SekundsSchschsch, then it goes even nothing.No smoke because of default Parts. But it has smoked; between the High-Voltage-Circuit(green) and the Main-PCB-Board-Ground updown side!See the Pictures at End. It`s a BG2000-641-505. I think it does not matter what kind of BG2000-641, because inside is all the same. The last 3 Numbers are only for Conection-Cabel. I by 2x Kaskade for 1 in stock. All so are the BJT: BUV26A, BC327 shortcut.After changing the Parts all Funktion o.k.Also i installed a 1A Fuse befor 230V Input.

author: Yansi
author_rank: Super Contributor
timestamp: December 10, 2019, 06:16:33 pm
content: Jeez... why the fuse addition? It already likely has one inside the IEC C13 connector housing and clearly it is a 1.6A slow blow.

author: BK-Tech
author_rank: Newbie
timestamp: December 10, 2019, 07:51:23 pm
content: There is not replacebel Fuse. Its a DIN-Conector with supress 230V in follow. Nothing Fuse!

author: BK-Tech
author_rank: Newbie
timestamp: December 10, 2019, 07:55:09 pm
content: I`m sorry .There is a Fuse-BoxVorget it
uCurrent Gold vs Current probe? - Page 1
Forum section: electronics / testgear

author: Puffin
author_rank: Unknown
timestamp: December 09, 2019, 12:56:13 pm
content: I need to measure some current spikes. I have an EEVBlog uCurrent Gold which I've used with my Tek scope for current measurements in the past with good success. But I'm not clear on the true bandwidth of the uCurrent - what detail can I expect to see? The alternative would be to get hold of a current probe (I'm considering the Tek TCP202A) but I'd like to better understand how much better performance (shorter current spikes) that would let me measure.Any advice on this subject would be gratefully received.

author: David Hess
author_rank: Super Contributor
timestamp: December 09, 2019, 03:02:14 pm
content: The MAX4239 used in the uCurrent Gold has a gain-bandwidth product of 6.5 MHz. Operating at a gain of 100, that will yield a bandwidth of about 65 kHz. A Tektronix TCP202A current probe has a bandwidth greater than 50 MHz so they are not even remotely in the same class. They also have very different sensitivities.So the uCurrent Gold is really only suitable for DC and line frequency measurements while the Tektronix current probe will work on switching power supplies.

author: SilverSolder
author_rank: Super Contributor
timestamp: December 09, 2019, 07:46:11 pm
content: According to the uCurrent spec sheet, the bandwidth is > 300KHz (3dB point).It does this by having two op amps in series, with a gain of 10x each.300KHz corresponds to a time constant of about 0.5uS... so perhaps we can say it should be possible to see a 5uS pulse at reasonable resolution with the uCurrent.I use my uCurrent for all kinds of crazy measurements, it is surprisingly useful to have a floating battery powered x100 amp.Try it on a signal generator and see what you get?

author: David Hess
author_rank: Super Contributor
timestamp: December 10, 2019, 12:19:31 am
content: The uCurrent *Gold* schematic I checked showed only a single x100 non-inverting gain stage.

author: SilverSolder
author_rank: Super Contributor
timestamp: December 10, 2019, 01:20:47 am
content: This one?uCurrentRev5schematic.pdf(121.94 kB - downloaded 112 times.)

author: David Hess
author_rank: Super Contributor
timestamp: December 10, 2019, 08:24:07 pm
content: Quote from: SilverSolder on December 10, 2019, 01:20:47 amNo, that is not the one I saw but it really does not matter. Slightly faster than 300 kHz is still very slow compared to a Tektronix current probe and not suitable for a switching power supply application.
Oscilloscopes with mouse operation - Page 1
Forum section: electronics / testgear

author: Alfons
author_rank: Regular Contributor
timestamp: December 10, 2019, 01:27:16 pm
content: Which oscilloscopes (or other measuring devices) allow a mouse operation. I know only the Windows devices (Tek, Agilent, Lecroy, all very expensive) and Micsig. I like the mouse operation of my Infiniium very well. So far I have only found the Micsig. Are there alternatives?

author: nctnico
author_rank: Super Contributor
timestamp: December 10, 2019, 01:29:56 pm
content: The R&S RTM3004 supports (USB) mouse operation. The cheaper RTB2004 likely does too but I have not tried.

author: BillB
author_rank: Unknown
timestamp: December 10, 2019, 01:41:14 pm
content: More and more of the Linux based devices are supporting mouse and keyboard operation. The Siglent SDS5000X scope does and I believe the SSA3000X Plus SA does as well. I think the Rigol MSO8000, MSO5000, DS7000 do to.

author: 2N3055
author_rank: Super Contributor
timestamp: December 10, 2019, 02:37:59 pm
content: Keysight Infiniivision 3000T series does, and I guess 4000/6000 too.. Keyboard too.

author: Alfons
author_rank: Regular Contributor
timestamp: December 10, 2019, 02:54:11 pm
content: So, as it seems, many devices that have touch-dislay seem to be equipped with mouse operation as well? Of course, only the more expensive ... I did not know that Rigol and Siglent had that .

author: 0culus
author_rank: Super Contributor
timestamp: December 10, 2019, 03:25:28 pm
content: Yeah, a lot of them support it now. Even the relatively ancient Tek TDS5000 series scope that I have on my desk at work supports mouse and keyboard (it runs Windows after all).

author: Alfons
author_rank: Regular Contributor
timestamp: December 10, 2019, 03:56:47 pm
content: Quote from: 0culus on December 10, 2019, 03:25:28 pmYes, the old Windows Scopes were already fully usable with keyboard and mouse, and that's already around Year 2000. And when you grow up with Windows ...The manufacturers seem to come only now with the smaller devices with it, since Touch and Mouse are almost identical on the software side. I do not know if they can be used as well with the mouse as the Windows scopes. Many reports that this works well with the Miscig. I never read anything from the others. In any case, for me, mouse operation would be an important option, not so much for the Attenuators or the Timebase, but for all the extra features the devices offer.

author: tautech
author_rank: Super Contributor
timestamp: December 10, 2019, 06:20:00 pm
content: Quote from: BillB on December 10, 2019, 01:41:14 pmCurrent list:SDS5000X Touch or mouseSVA1000X Touch or mouseSSA3000X+ Touch or mouseComing soon SDS2000X+ Touch or mouseAll models with an inbuilt webserver allow for PC based mouse controlSDS1*04X-ESDS2**2X-E
accessing Keysight U1177a bluetooth adaptor via Python - Page 1
Forum section: electronics / testgear

author: kgmuzungu
author_rank: Newbie
timestamp: December 09, 2019, 10:47:35 pm
content: Hi,you will find more information here:http://blog.philippklaus.de/2014/02/agilent-u1273ahttps://www.mjoldfield.com/atelier/2011/06/agilent-macos.htmlHere an example code that worked for me on a Windows10 machine running Python 3.8Code:import serialimport timefrom datetime import datetimeprevTimeStamp = datetime.now()print(prevTimeStamp)def send_receive(command):print(command)command = command + '\n'ser.write(command.encode())time.sleep(0.05)received = ser.readline().decode('utf-8')# print(received)return received"""#possible commandssend_receive('*IDN?')send_receive('SYST:BATT?')send_receive('CONF?')send_receive('STAT?')send_receive('FETC?')#send_receive('*RST')send_receive('SYST:VERS?')send_receive('SYST:ERR?')"""with serial.Serial('COM6', 9600, timeout=1) as ser:for x in range(10):line = send_receive('READ?')# line = ser.readline().decode('utf-8')# print(line, float(line.decode('utf-8')))timestamp = datetime.now()timeDelta = (timestamp - prevTimeStamp).microsecondsprint(str(timestamp.second) + ',' + str(timestamp.microsecond), ' : ', float(line), "timedif to prev:",timeDelta,"microseconds")prevTimeStamp = timestamp
Playing with Junk YT channel (PWJ160) Nixie display HP 5201L Scaler-Timer.  - Page 1
Forum section: electronics / testgear

author: wilfred
author_rank: Super Contributor
timestamp: December 09, 2019, 10:35:34 am
content: I just thought some here would enjoy this video by YT channel Playing with Junk. It covers the NIXIE tube modules user in HP gear of mid '60's vintage with a discussion on the Neon lamp/photosensitive resistor circuit and discrete flip-flop circuit used to drive the displays. It gives some inside view of the 5201L near the end.It reminded me of another (sadly short lived and defunct) YT channel "The Dinosaur Den" featuring Fran Blanche and Bil Herd which also had a segment discussing these interesting modules.And that also reminded me of the episode Alan Wolke W2AEW appeared.
ETCR007AD oscilloscope current clamp probe - Page 1
Forum section: electronics / testgear

author: blitzking
author_rank: Newbie
timestamp: May 13, 2019, 06:34:35 pm
content: Has someone bought the ETCR007AD clamp probe? Is it any good? Does it suffer from the same kind of problems as the Hantek CC65? (i.e. Oscillations and drift)

author: Dainis
author_rank: Newbie
timestamp: December 06, 2019, 07:24:05 pm
content: I also searching real feedback aboout ETCR007AD, only what I found:dot_bob 4 months agoI picked up a ETCR007AD from aliexpress a year ago and it is pretty noisy just like the OWON in this video. Not worth buying in my opinion. I cracked it open and the PCB is pretty sad, missing more than 75% of the components and the two lone IC's that are populated have the ID markings ground off.Yes, The hantek is really the only of the three that seems to work properly. The ETCR007AD I have is too noisy to use as a trigger source in addition it doesn't meet the advertised frequency spec of 100Khz, it's more like 8Khz.

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: December 06, 2019, 09:55:36 pm
content: https://youtu.be/cCW_WZbr4ZYI have bought a couple of the Hantek probes in different current types. Now my requirement have been pretty mundane but I have had no complaints and would recommend them. I think I feature one in my video so I will post a link if I can find itsChris

author: nctnico
author_rank: Super Contributor
timestamp: December 07, 2019, 01:01:09 pm
content: Quote from: Dainis on December 06, 2019, 07:24:05 pmThis guy is comparing apples and oranges. The Hantek has a much higher sensitivity so it has to have a lower bandwidth (this is a side effect of using a HAL sensor). The Owon CP05 is much less sensitive but has a higher bandwidth and more noise (again: typical for a HAL sensor). If you look closely at the signals during the FRA measurement in the video you'll notice there is not enough signal to make a good measurement of the Owon probe so the FRA graph is a bunch of nonsense. The weird jumps in the phase response graph are a typical symptom of not having enough signal amplitude to resolve the phase. The creator of the video should have used a much higher current to get a decent signal from the Owon probe.I've done an FRA plot from my CP05A using a 4.7 Ohm load resistor in order to have as much current through it as possible given the limited output amplitude of the internal generator:The -3dB point is around 240kHz.

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: December 07, 2019, 08:41:43 pm
content: https://youtu.be/cCW_WZbr4ZY. Look around 17 minutes inThe above is a link to a mini review of the Hantek that i promised. I haven’t noticed any problems with drift or frequency response but I have only used on it relatively high power circuits at low frequencies. I do really like it has been perfect for my use and is very well priced. I also bought the high current version for investigating cranking current and compression testing on my Chevy truck alongside a ignition sensorRegards Chris
Tektronix tunnel diodes, how to test ? - Page 1
Forum section: electronics / testgear

author: alpher
author_rank: Frequent Contributor
timestamp: December 07, 2019, 01:12:11 am
content: Hi, just bought a few of the rare 152-0177-02 tek tunnel diodes.They're obvious pulls, is there a simple way to check them if they're any good?I don't have a curve tracer, tried a simple check with 100resistor and 100Hz ramp signal from function genFrom here :https://hackaday.com/2019/05/08/fun-with-negative-resistance-jellybean-transistors/But all I get is a straight line like resistorsAfraid to damage the quasi unobtanium diodes, can anyone suggest a better circuit to test them?

author: madao
author_rank: Frequent Contributor
timestamp: December 07, 2019, 06:43:20 am
content: Ramp like resistor and current over 10mA is reached.Sadly, it is dead.Tunneldiode doesn't like good long high current about peak current . This is a notice.Regardsmatt

author: jonpaul
author_rank: Super Contributor
timestamp: December 07, 2019, 04:48:27 pm
content: Hello the TDs are available on epay occasionally new packages or Chinese copies or Russian equivalentNEVER USE a func gen 50 ohms without a 1 k series resistanceUse a positive only ramp no negative!Read up on TD precautions and testing first.Even a microsecond of overload kills them, eg static electricity.Handle with static precautionsJon

author: GerryR
author_rank: Frequent Contributor
timestamp: December 07, 2019, 05:46:44 pm
content: Here's a quick tutorial by W2AEW:
Flukeview2 CSV export help. - Page 1
Forum section: electronics / testgear

author: jonkers
author_rank: Newbie
timestamp: December 07, 2019, 06:58:27 am
content: Hello all. Using a fluke 125b scopemeter and i have exported the data from flukeview2 to a .csv file.When I open it up there is 3 main column's of data. The first is the sample time and the next 2 in this case are current.It looks like the B column is where the minimum is from and the C column looks as though that is where the Max and Average comes from.Just wondering if anybody could explain a little more.EG.0.00 16.90 17.002.00 16.90 17.004.00 16.60 17.006.00 17.00 17.208.00 17.20 17.3010.00 17.20 17.3012.00 17.10 17.3014.00 17.10 17.2016.00 17.10 17.1018.00 17.10 17.2020.00 17.20 17.40
Weird HP 8564E/8565E PSU - Page 1
Forum section: electronics / testgear

author: F1GWR
author_rank: Regular Contributor
timestamp: December 06, 2019, 10:00:47 am
content: Who could help in explaining how this SMPS buck regulator works :- how is it powered (anode VR131, pin 5 U131, pin 3 U132, TP102)?- "ground" return is it at a variable potential and pulsed?- C131 has too low value to filter out VR131 voltage (t = C.V / I ~ 3 µs (switching frequency is around 80 kHz)Christian

author: CDaniel
author_rank: Frequent Contributor
timestamp: December 06, 2019, 05:33:13 pm
content: This is not weird , this is how you do it if you don't have an insulated power rail . The power transistor Q102 is driven G-S , so the source is made virtual ground . The reservoir capacitor is C132 , it seems to be enough to hold the charge when the source goes high . It is charged through diode CR131 when source is low .Usually , buck converter ICs , like LM2576 and many , many others use a P channel Mosfet which doesn't require this to be driven .

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 06, 2019, 09:36:49 pm
content: It was also puzzling me, I didn't get why the other end of the +14VP wasn't referenced to the MOS source until I looked at the full schematic and saw it was also used elsewhere.So it's as CDaniel said:CR131, C131, C132 for the bootstrapped supply, for time constants given the values of C131, C132 the buck regulator must always have a low duty-cycle.

author: CDaniel
author_rank: Frequent Contributor
timestamp: December 06, 2019, 09:56:49 pm
content: This kind of driving topology is fairly common for half-bridge upper Mosfet , which source is also floating ... and works well , you don't need an insulated power rail just for that .
First impression of Wanptek NPS3010W - Page 1
Forum section: electronics / testgear

author: ElectricPower
author_rank: Frequent Contributor
timestamp: December 04, 2019, 09:01:21 am
content: Yesterday I received the Wanptek NPS3010W and I have to say I was very surprised at how good the quality was compared to how I thought it was going to be.It felt compact and according to the multimeter it was almost spot on.For $ 26, I think this was a bargain.

author: _Wim_
author_rank: Super Contributor
timestamp: December 05, 2019, 06:55:27 am
content: Quote from: ElectricPower on December 04, 2019, 09:01:21 am26$?? I guess you mean 62$, no?

author: BravoV
author_rank: Super Contributor
timestamp: December 05, 2019, 07:14:31 am
content: Quote from: ElectricPower on December 04, 2019, 09:01:21 amDefine "good" according to you.
Sapphire Instrument Being Sold Or Shutdown - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: December 04, 2019, 01:45:22 pm
content: Sapphire Instruments, who make my HVP70 probe and is the OEM for half of the differential probes on the market for the big players like Lecroy et.al is going to either be sold to a new company.The sale is still pending though, and if it falls through the company will shut down on July 31st 2020.

author: Cubdriver
author_rank: Unknown
timestamp: December 04, 2019, 04:34:16 pm
content: Fingers crossed that they are acquired and production continues without interruption. That said, I just ordered another one so I'll have a pair, just in case. It's not needed too often, but when it is nothing else will easily replace it.-Pat

author: maginnovision
author_rank: Super Contributor
timestamp: December 04, 2019, 04:34:24 pm
content: Wow, I hope that sale goes through.

author: rt
author_rank: Regular Contributor
timestamp: December 04, 2019, 06:03:41 pm
content: Maybe Danaher would buy them if the price was right?

author: TheSteve
author_rank: Unknown
timestamp: December 04, 2019, 06:41:12 pm
content: So Sapphire Instrument will soon become "EEVblog Instrument" ?

author: EEVblog
author_rank: Unknown
timestamp: December 04, 2019, 11:56:45 pm
content: Quote from: TheSteve on December 04, 2019, 06:41:12 pmSure, my next Adsense payment should cover it
Fluke 87V component has gone "volcanic" - with what to replace? - Page 1
Forum section: electronics / testgear

author: Nullarbor
author_rank: Contributor
timestamp: November 30, 2019, 11:22:28 pm
content: Hello everyone. I could not find info on this component so far.I've searched quite a lot here but have not read everything by any means - is that even possible?I usually use the Fluke 87V for measuring DC up to 16 volts and currents @ DC 30-160mA.I did manage to cross some wires and got a short circuit for a few moments.The fuse popped, so I went about changing it. Doing that, I spotted this "volcanic" component. Pictures attached.My question: what component is it and what value, tolerance etc. does it have? I'd like to replace it.My assumption is that its a shunt resistor, but since "assumptions make an ass out of you" , I'd ratherask way more knowledgable people.The Fluke is still working fine though after changing the fuse. That has me scratching my head a bit.Thank you, Cheers!

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 30, 2019, 11:54:33 pm
content: Should be the current shunt for the lower Amps input.About 3' of google would have told you it's a 1ohm, 1% resistor. The manufacturer's name is on it, you'll have to do a little research if you want to find the exact model.

author: gslick
author_rank: Frequent Contributor
timestamp: November 30, 2019, 11:57:27 pm
content: Possibly a Vishay Dale WSR2 "Power Metal Strip® Resistor"https://www.vishay.com/docs/30101/wsr.pdfIf that is R5 one Fluke 87V Multimeter Service Manual has these specifications:1-OHM+-1%2W75 PPM/CFor example:https://www.mouser.com/Search/Refine?Keyword=WSR21R000F

author: Nullarbor
author_rank: Contributor
timestamp: December 04, 2019, 10:43:24 pm
content: Thank You! That's sorted now.
Keysight U1232A programming guide - Page 1
Forum section: electronics / testgear

author: DavidDLC
author_rank: Frequent Contributor
timestamp: December 04, 2019, 03:04:56 am
content: Hi,I'm looking for the U1232A programming guide, I need to read voltages from a C# application, I need to know the commands for it. I googled it and didn't find any useful link.It is urgent if somebody can help me with this.Thank youDavid DLC
Craftsman 982018 multimeter -- manual and manufacturer? - Page 1
Forum section: electronics / testgear

author: TimeBandit
author_rank: Regular Contributor
timestamp: November 30, 2019, 09:51:36 pm
content: I just picked up a Craftsman 982018 multimeter for a few bucks. It'll be a backup to the backup for my backup.So far I haven't had any luck finding the manual online. Even though it obviously isn't necessary to use the meter, I like to have one when possible. If anyone has or knows where to find a copy, let me know. Or if you know who the manufacturer was and whether this was a rebadge of another model, that would help too.

author: TimeBandit
author_rank: Regular Contributor
timestamp: November 30, 2019, 10:12:29 pm
content: Ok, looks like it's made by Colluck. I'll hit them up for a manual. Glad I only paid $5.http://www.colluck.com.hk/diyhp/9359/enus/c-25520/p-AAASX6AAgAAB4SWAAk/Autoranging_Digital_Multimeter_w_Bargraph.html

author: rvalente
author_rank: Frequent Contributor
timestamp: December 04, 2019, 01:15:33 am
content: The saying is true, never buy a meter with a transistor tester/ hfe gain meter (or a 20A current range)....But for only $5 (cheaper them some coffees) that's fine.

author: TimeBandit
author_rank: Regular Contributor
timestamp: December 04, 2019, 02:40:31 am
content: I hadn't heard that saying, but it definitely applies here!Now I'm not so sure that Colluck made it. For one thing, it appears their meters are made in China (ok, Shanghai), whereas this one was made in Korea. I'm thinking that another company made it originally and Colluck now uses the design, not that it's anything so special that it would be worth emulating. Anyway, it's just a curiosity at this point.
Test leads for rebranded Mastech multimeter - Page 1
Forum section: electronics / testgear

author: sky666
author_rank: Contributor
timestamp: December 07, 2019, 11:20:41 am
content: Hi,Does anyone have an idea where I could find test leads for this type of input contacts without cutting the insulation of test leads? It's an older multimeter, a rebranded Mastech. The plastic insulation around the inlet contacts has a diameter of 7mm (0.27 inches), unlike the UNI-T UT61 for example which is about 5mm (0.19 inches). The diameter of the inner contact is approximately the same. Contact depth is about 12mm (0.47 inches).
DIY Kelvin Probe Wire Routing Question - Page 1
Forum section: electronics / testgear

author: t1d
author_rank: Super Contributor
timestamp: December 03, 2019, 09:46:00 am
content: I am making my own 4-Wire sets. I have the correct type Kelvin connectors with the separate jaw connections.I see that some OEM sets have the wires separated, one going to each handle of the clip. See Top Right Corner.Others have the wires remain in a pair with one wire looping through the clip's joint to go to the other side. For this type set, the leads are of two different lengths. See Blue Arrow.Keeping the pairs together and entering on only one handle would be more convenient. But, I wonder if the difference in the wire lengths effects accuracy. What do you think?

author: Brumby
author_rank: Unknown
timestamp: December 03, 2019, 09:50:37 am
content: The whole point of Kelvin clips is that the point of common contact isATthe DUT - not some distance along a common conductor. The ones that have a separate connection to each side of the jaws are doing this properly. Whether they enter separately or along one side is not really important - just that they only meet at the DUT.

author: t1d
author_rank: Super Contributor
timestamp: December 03, 2019, 11:21:00 am
content: Thanks, Brumbly, good info.Quote from: Brumby on December 03, 2019, 09:50:37 amFrom my research, I thought that it would not matter, but it is always better to ask those little questions that nag at you...Quote from: Brumby on December 03, 2019, 09:50:37 amI knew that this point is important and that is why I stated that I have proper Kelvin clips.I appreciate your help.

author: Gyro
author_rank: Super Contributor
timestamp: December 03, 2019, 11:35:22 am
content: The only other thing is to use nice flexible wire as the bend radius is quite tight near the hinge. Also check that the ends of the spring are well insulated - sometimes you find that the sharp ends can wear through the insulating sheet and make contact with the contact metal, if it looks dodgy then some sleeving on the spring ends will help.I do agree that the style with both wires going into the same handle are ergonomically nicer though.
HP 3580A alternative - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: December 02, 2019, 09:46:36 pm
content: Sorry to create yet another thread today but anybody know of any alternative to the 3580? I’m looking for a low frequency analyser. I’m interested in messing with new audio effects etc but these things have really held their value. Most spectrum analysers don’t go anywhere near the audio spectrumThanks.

author: capt bullshot
author_rank: Super Contributor
timestamp: December 02, 2019, 09:54:33 pm
content: The Analog Discovery from Digilent and this Red Pitaya (STEMLAB) thingy cover the audio range, a sound card might do the job also, otherwise there are some boat anchor FFT analyzers out there (like the 3581). The Tektronix 7L5 plugin for 7000 series mainframe is a sweeping analyzer like the 3580 (10Hz ... 6MHz, down to 10Hz RBW).

author: cowasaki
author_rank: Frequent Contributor
timestamp: December 02, 2019, 10:33:49 pm
content: Quote from: capt bullshot on December 02, 2019, 09:54:33 pmThanks, I have downloaded some software and it looks the business but I was hoping to find a stand alone piece of kit at the right price £300-500 for a 3580a seems excessive but if that’s what they go for!!

author: Dacke
author_rank: Regular Contributor
timestamp: December 02, 2019, 10:41:52 pm
content: Probably a more popular boat anchor from HP specifically designed for audio would be a 3582A - 0.1 Hz - 26.5 KHz, but I don't see them on Ebay as much as the 3580. There's also the 3561A and 3562A, both uHz - 100 KHz. Checking Ebay for "Dynamic Signal Analyzer" instead of Spectrum Analyzer will also get you more results for gear in the low frequency ranges.
Analogic (Data Precision) 6000 digitizer mainframe manuals? - Page 1
Forum section: electronics / testgear

author: 0culus
author_rank: Super Contributor
timestamp: November 30, 2019, 06:28:32 pm
content: I'm in search of a manual for these units. I scored two of them very cheap at a surplus auction, along with a pair of model 620 digitizing plugin units. I'm pretty sure the mainframes work fine, but the units will only rarely trigger and I'm not sure if it's a problem with the user or the test equipment.The reason I picked them up is I already own a 2045 polynomial waveform generator...with the digitizer you can digitize arbitrary waveforms and play them back using the 2045...if you can get things working.Anyone familiar with these?

author: eevcandies
author_rank: Regular Contributor
timestamp: December 02, 2019, 02:39:50 am
content: this link gives just a small smidge of info...it is some app that programs the analogic 6000 (code listing & commands included) to interface with something for some data intefacing/collectionDTIC ADA244347: Interfacing the Analogic 6000A Waveform Analyzer to the XM21 Chemical Remote Sensor:https://ia803102.us.archive.org/24/items/DTIC_ADA244347/DTIC_ADA244347.pdfthis link also has some codes (search for "analogic" in pdf)https://apps.dtic.mil/dtic/tr/fulltext/u2/a252617.pdfalso note there was a data precision/analogic 6100 & analogic 6500 models as well (for more searches)Reset: The Analogic can be reset by simultaneously pressing the (BLUE) F button and the RST button.The DIR and PROG button when pressed together will allow the user to put the device in Local or Remote mode to verify its operation manually.

author: 0culus
author_rank: Super Contributor
timestamp: December 02, 2019, 05:19:40 am
content: Thanks for the links! That reset combination is super handy...it seems to get the unit out of whatever state it's getting into where it won't trigger.

author: eevcandies
author_rank: Regular Contributor
timestamp: December 03, 2019, 12:41:41 am
content: We had one of those setups in the early 90's...what a hoot, it was only around $40000 for our setup. Of course our 300MHZ digital scope somewhere around $25000, maybe more.

author: 0culus
author_rank: Super Contributor
timestamp: December 03, 2019, 01:52:40 am
content: HA! I scored a pair of them for $100...how the mighty have fallen...Still hoping to track down a manual.
Calibrate your metrahit 18s without specific software---I figured it out - Page 1
Forum section: electronics / testgear

author: eric.niu
author_rank: Newbie
timestamp: December 02, 2019, 10:15:42 am
content: Guys, I was playing my 18s yesterday and guess what, I accidentally found out how to calibrate this instrument. Here is the steps1. Power off your DMM and open the case.2. Turn the screw clockwise to the end, then power on, you will see MAN on the display, now it's in calibaration mode, not possible to switch to auto range3. The calibration point is 0 and 285 digits, for example when you calibrate 300.00 mV range you need calibrate 0 and +- 285 mv. other ranges are similar. Adjust the input signal and press the DATA/MINMAX key, you will see CAL on the display, a short beep means your input is accepted.4. When you done the calibation turn the screw back to the end, power off and power on you 18s, enjoy your calibated device now.Cheers

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 02, 2019, 11:22:43 am
content: Although I haven't been able to find photos of the 18s to confirm, I think it is based on a Maxim DMM ADC.The "screw" is likely to be the trim for ADC Vref so, yes very important for calibration.I don't see why this would be a way to set the DMM to a calibration mode though, at the best the CPU can detect that Vref is out of range and push user to do something about it.I would be very surprised that this DMM has ability to store calibration data for each range separately, more likely once you have one range adjusted they should all be good?I could be wrong of course...

author: eric.niu
author_rank: Newbie
timestamp: December 02, 2019, 12:23:51 pm
content: Thanks for the comments, in the beginning I also thought that VR is for Vref adjustment, I tried adjust it but the display changed nothing.
Tektronix MSO4 firmware update for faster UI - Page 1
Forum section: electronics / testgear

author: flint
author_rank: Newbie
timestamp: November 27, 2019, 12:55:54 am
content: I have been looking at buying an Tektronix MSO4 for a while. But every time I watch the MSO4 videos online I feel like the sluggishness would drive me a little crazy.Unfortunately I don't have the kind of budget that would let me buy an MSO5.Do any of you have an MSO4? Is the UI fairly snappy in real life, both in viewing wave forms and also in operating the scope? Is it comparable to the MSO5 (which is an Intel Core-i5 with a lot more power than the dual-core ARM in the MSO4).I know that there was a firmware update on September 4th that says it improved the UI performance, but I'm hoping to learn from real-world experiences before I pay that much for a scope. So far all I can observe are a dozen YouTube videos that all came out before that update.I know there are lower-cost scopes out there. I've spent dozens of hours watching videos on all of them. The MSO4 is the one that speaks to me the most.If I buy the MSO4, I'd be happy to share my experiences with it too.Flint

author: BrianH_Tektronix
author_rank: Contributor
timestamp: December 02, 2019, 10:21:10 pm
content: As the firmware release states, there were some nice improvements to the UI that will ease any concerns you were seeing online. Yes the 5/6 Series have more horsepower and thus will be more responsive. But the engineering team made some good improvements.Please don't hesitate to contact your local account manager and ask for a him or her to drop by with a unit to test out. We prefer that you be happy with your purchase. Feel free to PM me and i'll personally make sure the local account manager brings by an updated unit for you to test drive.Cheers,Brian

author: flint
author_rank: Newbie
timestamp: December 04, 2019, 04:32:34 am
content: Brian,Thanks for the post! That is good news.Any chance that Tektronix is going to post new MSO4 videos sometime soon? I'm just trying to get a feel for performance.Flint