hybridfree/eevblog-posts huggingface dataset:
Bargain ISO-TECH IDM66RT Multimeter - Page 1
Forum section: electronics / testgear

author: mikerj
author_rank: Super Contributor
timestamp: May 22, 2019, 10:09:36 am
content: Copied this from the for sale section on the advice of WackyGermanI found theseISO-TECH IDM66RTMeters being sold on UK eBay which seem like good value. This is a well made, properly protected 6000 count meter that RS currently sell under theirRSPRObrand for £182 inc VAT.The main limitation is the lack of a mA range, the 10A range has a 1mA resolution so not ideal for electronics work, but perfect for sparkies or for automotive work. I bought one to replace a cheapy I had in my garage for working on the car, and it's in a different league to an equivalently priced Chinese no-name. It has a probe warning if you select volts with the prob in the Amps socket, a proper Bussmann HRC fuse, plenty of MOVs and PTCs and no contact voltage detection. The only gripe I have is the probes are pretty mediocre.

author: threephase
author_rank: Regular Contributor
timestamp: May 22, 2019, 12:40:14 pm
content: That is certainly a good buy.I believe Iso-Tech is the old RS Components brand that they have now rebadged as RS Pro for a while range of products from test apparatus to hand tools and some components. Probably why it is being sold off at such a good price.The RS Pro brand test apparatus seem to be a mixture of either Appa Technology or CEM designs. I believe the IDM66RT is an Appa Technology design, similar to their M series multimeters.The link you have posted to in RS is for a UKAS calibrated device, which always puts the price up. As it stands without RSCal or UKAS, they sell it for £105.97 including VAT - £88.31 without VAT. Still a great buy though.Kind regards.

author: windsmurf
author_rank: Frequent Contributor
timestamp: May 23, 2019, 06:19:04 am
content: I don't think I could get over its aesthetic...

author: mikerj
author_rank: Super Contributor
timestamp: May 24, 2019, 12:12:51 pm
content: Yeah it's not a pretty looking device, but function goes before form every time for me.

author: GreyWoolfe
author_rank: Unknown
timestamp: May 24, 2019, 04:00:09 pm
content: Quote from: mikerj on May 24, 2019, 12:12:51 pmI am with you on that one. Mrs GreyWoolfe looks at me cross eyed whenever I say that.
Siglent SDG2042X 30MHz Sine Wave THD vs. Output Power - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: May 23, 2019, 04:02:34 pm
content: I measured the sine wave THD (total harmonic distortion) of my new Siglent SDG2042X function generator last night using my Siglent SVA1015X spectrum analyzer. The total harmonic distortion at 0dBm output into 50 Ohms at 30 MHz exceeds the published specification of -55 dBc by more than 10 dB. This is excellent. However the distortion rises with output power and increases to -45 dBc at 5Vpp (18dBm).I used an external 20 dB attenuator in combination with the SVA1015X internal attenuator for the +10 dBm and +18 dBm measurements.+18 dBm+10 dBmFor the 0dBm and -20 dBm measurement I removed the external attenuator and used only the SVA1015X internal attenuator.0 dBm-20 dBmFor the -45 dBm measurement I turned on the SVA1015X internal preamplifier. In this measurement you can see noise floor plus spurs of the of the output of the SDG2042X is at -95 to -100 dBm above 60MHz.-45 dBmIf I were to use the SDG2042X as a low distortion RF source at 30 MHz I would stick to output powers between -20 dBm to 0 dBM and use an external attenuator, since the distortion increases above 0 dBm.Overall my initial impression so far of the SDG2042X is this is excellent performance, especially for the price.Chris

author: kg4arn
author_rank: Unknown
timestamp: May 23, 2019, 04:25:11 pm
content: Thanks. I just bought one a week ago but haven’t looked at the output spectrum yet.

author: graybeard
author_rank: Frequent Contributor
timestamp: May 23, 2019, 04:39:34 pm
content: Quote from: kg4arn on May 23, 2019, 04:25:11 pmMine arrived on Monday. I bought it fromSaeligsince they offer an EEVblog member discount.
8563E problem - Page 1
Forum section: electronics / testgear

author: chipso
author_rank: Newbie
timestamp: May 22, 2019, 08:13:23 pm
content: I have problems with my 8563E.Turning on sometimes takes about one minute or a little more until the CRT lights up.(seems it takes longer and longer)the boot process is over until I see the glow of the tube.(If I turn off the 8563E after the start - and again on - it takes about 20 sec - then i can see the boot process.Has anyone already observed this, or does anyone have tips to prevent a worst-case(sorry for my small english)Thank'sJohn

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: May 22, 2019, 08:25:57 pm
content: I don't know about you, but I tend to keep intensity low. I see a similar issue with my 53310A.If you haven't, try giving the intensity a boost. Probably needs more the older it gets... like the rest of us

author: chipso
author_rank: Newbie
timestamp: May 22, 2019, 08:45:09 pm
content: The CRT is sharp and bright. (brightness is 25)The HP 8563E only has an operating time of 5200 hours.john
Sefram 7500 multifunction meter ? - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 23, 2019, 07:45:25 am
content: I missed this one recently on Evil bay.Although I found no info at all on it, it looks like a very interesting bench DMM.Does anyone out here know anything about it? Is it manufactured by someone other than Sefram?

author: 2N3055
author_rank: Super Contributor
timestamp: May 23, 2019, 08:16:56 am
content: Looks like Prema 8017

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 23, 2019, 09:01:08 am
content: Quote from: 2N3055 on May 23, 2019, 08:16:56 amSo it does, very impressive meter! It's the first time I see a DMM with a hard diskNow I know what it is, I wish I had been a little more serious on the bidding now... It sold for 158€ only!https://www.ebay.com/itm/123763319090

author: 2N3055
author_rank: Super Contributor
timestamp: May 23, 2019, 09:27:55 am
content: Quote from: shakalnokturn on May 23, 2019, 09:01:08 amYep, that's a shame..
Hioki IM7587 3GHz Impedance Meter - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: May 22, 2019, 03:47:43 pm
content: I saw thisHioki IM7587 3GHz Impedance Analyzeryesterday at theSpace Tech Expoin Pasadena. What was of the most interest to me was the fixture for measuring small surface mount components, since I am considering building to use with my Siglent SVA1015x. I though it might be interesting to others as well, so here are a few photos I took. (click on photos for full size versions)... Chriis
Hantek 6074BE wiring diagram needed - Page 1
Forum section: electronics / testgear

author: mazzerman
author_rank: Newbie
timestamp: May 22, 2019, 09:22:56 am
content: hello alli have to have my Hantek 6074BE scope repaired, but i need a pcb wiring diagram 1st. can anyone point me in a direction where i might be able to find one please?
sigrok with MSO1104Z - Page 1
Forum section: electronics / testgear

author: Gioreva
author_rank: Contributor
timestamp: April 16, 2017, 04:30:20 pm
content: I installed pulseview-NIGHTLY-32bit-static-release-installer.exe for Window.Already i have UltraSigma, UltraScope ecc.Sigrok, Connected to Rigol TCP/IP found my device.It connects, send the commands, changes parameter, start the acquisition, but nothing appair on PC windows.What can I try ?

author: Electro Fan
author_rank: Super Contributor
timestamp: May 22, 2019, 09:05:30 am
content: I know this is a very old/long ago thread but I'm interested in trying what I think the OP was trying....I understand that Rigol 2000 scopes are supported by Sigrok PulseView but I didn't quite understand how the data is supposed to get from the Rigol scope to PulseView. After reading this old post is it correct that the scope is connected to a PC via TCP/IP and then PulseView will find and decode the data probed by the Rigol 2000s 2 analog channels? If this is a yes, any chance Sigrok can take also decode data from a MSO2072A's digital channels too?
Rigol-1054 Killer is out for $388 - Page 1
Forum section: electronics / testgear

author: 0xFFF0
author_rank: Regular Contributor
timestamp: May 20, 2019, 08:58:53 pm
content: Bad news for Rigol:https://owontechnology.eu/owon-xds3064e-60mhz-4ch-oscilloscope-2259.html-Record length: 40M !!!-Touch screen like Rohde & SchwarzSweet:https://owontechnology.eu/lowest-price

author: ataradov
author_rank: Super Contributor
timestamp: May 20, 2019, 10:02:10 pm
content: That does look pretty good. But I would wait until there is a bit more collective knowledge and more in-depth reviews and tests. The unlocking part is also of interest.

author: maginnovision
author_rank: Super Contributor
timestamp: May 20, 2019, 10:36:19 pm
content: The processor chugs like hell with persistence. That screen is a touch screen but I think that's where the similarity to the R&S screen ends. Smaller, lower resolution and they have almost ignored the fact that it has a touch screen. I don't know if I'd recommend this over the rigol... Might be a toss up. It does have battery option which is nice and I assume this isn't an entirely new firmware so shouldn't be too bad for bugs.

author: windsmurf
author_rank: Frequent Contributor
timestamp: May 21, 2019, 12:25:04 am
content: Wow, nice!Wifi connectivity, 13.2A battery option, Digital Multimeter option, VGA Out, Arbitrary Waveform Generator option...Just looked at the DMM option specs, and its meh...Full Scale Reading 3 ¾ digits (max 4000 count) Diode 0V - 1.5VInput Impedance 10MΩ Continuity Test <50 (±30) beepingCapacitance 51.2nF - 100uF: ±(3% ± 3 digits)Voltage VDC : 400mV, 4V, 400V: ±(1 ± 1 digit); max input: DC 1000VVAC: 4V, 40V, 400V: ±(1 ± 3 digits); frequency: 40Hz - 400Hz; max input: A C 400V (virtual value)Current DC: 40mA, 400mA: ±(1.5% ± 1 digit); 10A: ±(3% ± 3 digits)AC: 40mA: ±(1.5% ± 3 digits), 400mA: ±(2% ± 1 digit), 10A: ±(3% ± 3 digits)Impedance 400Ω: ±(1% ± 3 digits), 4 KΩ - 40MΩ: ±(1% ± 1 digit)

author: hgjdwx
author_rank: Regular Contributor
timestamp: May 21, 2019, 01:50:16 am
content: Where have the data and links?

author: martin1454
author_rank: Regular Contributor
timestamp: May 22, 2019, 07:55:36 am
content: Looks good, but I dont't know if it can knock the 1054Z off the throne since Rigol is a bit more known than Owon - Anyway, if the firmware is good and bug free, then it looks like a good deal
Looking for memory dump of EPROM of HP 8660D - Page 1
Forum section: electronics / testgear

author: jemotrain
author_rank: Contributor
timestamp: May 17, 2019, 04:40:38 pm
content: Greetings all...New guy on the forum. I read the forum for a long time because the useful hints for repairing test equipment.I got a HP 8660D Synthesizer System as “for parts or repair”.The system has some labels “Polar use only” and “modified for Polar”.The system powers up and I can see an output signal at the spectrum analyzer. It’s permanently sweeping or jittering, independent of the selected modulation or when the modulation is switched off.I thinks it’s a fault and I have to search for a phase locked loop which doesn’t lock.Other problem:The Sweep Rate button does not change the speed and the indicating light for the sweep rate does not show. But at power up, all the lights are flashing. So the Led’s are o.k.The push button is also functional, because pressing “SHIFT” and “Sweep Rate” provides the Reset functionality.So I open the “Digital Control Unit” module. The EPROM at the processor board doesn’t looks like an official HP Chip.Is that the modification marked by the labels ? (“POLAR”)Does anybody have a memory dump of the EPROM at the A1A3 board ?Searching at the web without success…

author: jemotrain
author_rank: Contributor
timestamp: May 22, 2019, 07:13:26 pm
content: During the last days i have done some tests:The option H32 seems to be special operating functions or something like that.I try to control the HP8660D via HPIB-Connection and some commands of the operating manual will be rejected and gave an error message.Eg. the command to set the sweep speed.In the meantime i began to disassemle the binary code for the integrated microprocessor MC6802.I hope to find all the possible commands for remote controlling.The repair/adjustment of the unlocked PLL was the other path to bring the HP8660D back to live...That sounds relative easy.Maybe someone has a copy of the EPROM of the CPU card. I am very interested. :-)
Voltage, current logger need... - Page 1
Forum section: electronics / testgear

author: Chriss
author_rank: Frequent Contributor
timestamp: May 22, 2019, 05:29:53 am
content: Hi!I have to buy or make a simple data logger which can log current and voltage over time.I need this tool or any other idea when I repair electronic in vehicles where some time some electronic power on and drain the battery.I can remember from the internet a nice device I found which hase no lcd just the inputs and can log several measurements like voltage, current, temp or whatever and with phone or pc are the data acceptable.I also think it was used and developped by a guy who works at NASA and he or hus team released it cor free or they also sell it for something like $20 or so. But i cant remember now tge name of the device and cant find it on the net.If somebodi have an informatiin about it pls let me know or any simole idea hiw to make a device for logging would be also nice.I dont need hig sample rate. 1Hz is enough but some time I must log over 10h...Thank you.Sent from my SM-J500F using Tapatalk

author: sotos
author_rank: Frequent Contributor
timestamp: May 22, 2019, 05:38:33 am
content: Look at this one.https://moosh.im/mooshimeter/

author: Chriss
author_rank: Frequent Contributor
timestamp: May 22, 2019, 06:07:08 am
content: Exactly what I searched for. :-)Thank you very much!Sent from my SM-J500F using Tapatalk
DDS AWGs in practice, reconstruction filter. Rigol DG800/900 in particular. - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: May 22, 2019, 07:02:01 am
content: I watched a YT video from RigolTech, purportedly explaining the advantage of l6 bit vs 14 bit digital waveforms.It was very short, not very illuminating and the oscilloscope screens used raised a question:Don't the DG800/900 series AWGs have reconstruction/anti-aliasing filters after the basic DAC?I hope they do...

author: ogden
author_rank: Super Contributor
timestamp: May 22, 2019, 07:27:51 am
content: Yes they do (attach)Picture from post inNew Rigol 16-bit function generators DG800/900 seriesdiscussion
AstroAI multimeter - Page 1
Forum section: electronics / testgear

author: retrev
author_rank: Contributor
timestamp: May 21, 2019, 06:57:55 pm
content: Had anyone used an AstroAI brand multimeter? I just picked one up for $33 USD. It claims 6000 count, true rms, auto ranging, 5.5 digit. It's got a temperature probe, capacitance measure, and some other woowee marketing features. I'm not expecting a fantastic meter for the price, wondering if it's at all worth the money.https://www.amazon.com/dp/B071JL6LLL/ref=cm_sw_r_cp_apa_i_eIe5Cb24GYM36

author: windsmurf
author_rank: Frequent Contributor
timestamp: May 21, 2019, 07:14:16 pm
content: At best its a 4 digit, not 5.5. Since its 6000 count I'd call it 3.75 digit...

author: Fungus
author_rank: Super Contributor
timestamp: May 21, 2019, 07:28:05 pm
content: Quote from: windsmurf on May 21, 2019, 07:14:16 pm6000 counts is 3.5 digits.DC accuracy is only 1% so it's probably closer to 2.5 digits in practice.On the plus side: Fuses look decent, it has plenty of features. Looks OK for the money.

author: windsmurf
author_rank: Frequent Contributor
timestamp: May 21, 2019, 08:45:08 pm
content: According tohttps://bkprecision.desk.com/customer/en/portal/articles/1535307-difference-between-counts-and-digits6000 count is a 3.75 digit...

author: Fungus
author_rank: Super Contributor
timestamp: May 21, 2019, 09:35:04 pm
content: Quote from: windsmurf on May 21, 2019, 08:45:08 pmTechnically it's 3.6 digits, if we're being pedantic.
OWON 3202A Arbitary Overshoot issue - Page 1
Forum section: electronics / testgear

author: patrik96
author_rank: Contributor
timestamp: May 20, 2019, 08:11:24 pm
content: May someone help to me,I buy a new OWON XDS3202A, with Arbitary generator,The issue what you see on the attachement is, a overshoot for Sqare wave and glitches on other waveform,(I was check another skope too, and diferent cable same issue)If some one has a same equipment please check it and reffer it.Thanks,I was ask from the factory , unfortuneately no answer still the las 10 days

author: genghisnico13
author_rank: Regular Contributor
timestamp: May 21, 2019, 02:26:58 pm
content: Does it happen in all the channels? Have you tried with an external 50Ohm terminator, instead of the internal one? is the coax 50Ohm?Is it the same at different vertical scales? it looks like a mismatch between resistive/capacitive dividers.

author: patrik96
author_rank: Contributor
timestamp: May 21, 2019, 04:08:39 pm
content: It happend with the 50ohm input impedance setting too, I try it with different cable different freq. but same , different vertical scale hase same resoult
Aneng AN8008 Multimeter Educational Review Video (Ohm's Law, Calculations, etc.) - Page 1
Forum section: electronics / testgear

author: mcsoftware
author_rank: Contributor
timestamp: May 21, 2019, 02:41:41 pm
content: My latest video is a mailbag video showing an Aneng AN8008 digital multimeter. I also make it educational by discussing/using Ohm's Law, parallel and series resistors/capacitors, etc. I also show unusual electronics parts and other unusual things. You probably already know about Ohm's Law, etc. but there probably is some things you hadn't thought of and parts you haven't seen before.
Hantek USB Oscilloscope  - Page 1
Forum section: electronics / testgear

author: jbuss_au
author_rank: Newbie
timestamp: May 20, 2019, 11:20:02 pm
content: Hi all,I was looking at getting an oscilloscope to practise measurement and use (I am a third year apprentice). I would prefer a nice digital one but they're too expensive.I saw this one on eBayhttp://tinyurl.com/hantek-OSC.I will be using it for home use and non critical measurements (accuracy is not necessary)Has anyone used one or could recommend one for under $200 (I live in Australia so postage for large items is expensive)

author: vk6zgo
author_rank: Super Contributor
timestamp: May 21, 2019, 04:23:55 am
content: Quote from: jbuss_au on May 20, 2019, 11:20:02 pmSorry,it seems Safari doesn't speaktinyurl!There is a very long thread about a particular Hantek USB 'scope (the 6022BE), which, in the main, is far from complimentary!In my opinion, you would be better off with a secondhand analog Oscilloscope.Keep a look out for Hamfests in your area, as they often have useful test equipment for sale, including 'scopes.Some of the earlier "standalone" DSOs which I wouldn't personally touch for my particular usage, are still superior to such things as the 6022BE, but are less common, & unfortunately are usually overpriced.

author: Gyro
author_rank: Super Contributor
timestamp: May 21, 2019, 09:06:48 am
content: I can't see your TinyURL either, but if it's pointing to a Hantek 6022be then threads of interest are:https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/https://www.eevblog.com/forum/testgear/owon-vds1022i-quick-teardown-(versus-the-hantek-6022be)/These should hopefully give you enough information to draw your own conclusions.
Rotten DS-1052E LCD Screen - Page 1
Forum section: electronics / testgear

author: erperez
author_rank: Newbie
timestamp: May 21, 2019, 11:40:58 pm
content: Hello all,I was wondering if someone knows of a replacement for the LCD on a Rigol DS1052E that has served me well over the years.It was on storage for a few months and when it came out the screen was rotten, like the sandwiched lcd layers peeled on the inside.ill post pictures later of the issue.suggestions?thanksEP

author: stj
author_rank: Super Contributor
timestamp: May 22, 2019, 12:08:15 am
content: i have seen tv's with "stuff" between the defuser layers,you can usually clean them if you have the patience.

author: YetAnotherTechie
author_rank: Regular Contributor
timestamp: May 22, 2019, 11:11:00 am
content: For some reason this is common on large TV´s. Carefully remove the damaged one, buy polarizing film from your favourite online Asian supplier and stick it to the cleaned panel.
Hantek 6074BC, Alternate software? - Page 1
Forum section: electronics / testgear

author: SagiC
author_rank: Newbie
timestamp: January 14, 2018, 09:25:58 am
content: Anyone know if OpenHantek is compatible with the 6074BC? (4 channel, 1Gs/s, 70mhz ) Or know of any other software that is.The factory software is as people say: Not great.But I cant seem to find a compiled executable of OpenHantek, so I'll have to jump through some hoops to build it myself. Though I don't really want to do that only to find out it doesn't work.-Thanks

author: SagiC
author_rank: Newbie
timestamp: January 21, 2018, 01:00:53 am
content: No one know anything about these Hantek scopes or what??

author: jjoonathan
author_rank: Frequent Contributor
timestamp: January 21, 2018, 04:36:26 am
content: Everyone knows to avoid them. I learned the hard way. Sounds like you will too. Sorry, man

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: January 21, 2018, 04:51:46 am
content: Same here, though luckily was able to return it and get my money back. If you still have that opportunity, I would strongly recommend it.

author: SagiC
author_rank: Newbie
timestamp: February 03, 2018, 02:48:00 am
content: Care to fill me in on this?Like, I'm aware that they are limited in capabilities compared to a bench top scope. But I only need it for entry level things.

author: martinloren2
author_rank: Newbie
timestamp: May 20, 2019, 09:51:46 am
content: Maybe arrived a bit late but HScope android app now support it. It is a quite heavy for the phone so better to use it with a battery pack but it works (2 channels with this app).
Turning Off Left and Right Menus on Rigol 1054Z - Page 1
Forum section: electronics / testgear

author: German_EE
author_rank: Super Contributor
timestamp: May 20, 2019, 06:10:20 pm
content: I have a temporary loan of a reasonably new Rigol 1054Z which has come without a manual. I downloaded one but I can't find one thing. There are vertical menus on the left and right side of the screen that take up about 1/6 of the screen space, how do I turn these off when not in use?

author: Daruosha
author_rank: Regular Contributor
timestamp: May 20, 2019, 06:15:29 pm
content: Quote from: German_EE on May 20, 2019, 06:10:20 pmNo, they are permanently on the screen and if you want to use the scope, you have to live with it. :-)
A Rigol DS1052E as first oscilloscope - Page 1
Forum section: electronics / testgear

author: terumi
author_rank: Newbie
timestamp: May 20, 2019, 02:23:54 pm
content: Hello people, I found a Rigol DS1052E for 310€ here in Greece.Does it worth its money as it is a > 10 years old model.I'm relatively new into electronics and I want mainly to develop audio circuits (both analog and digital, using microcontrollers).Will this model suffice? Will it become obsolete (unserviceable) in the next few years? Is the 50Mhz limit enough for a microcontroller running at faster speeds?Do you have any good alternatives?Thank you!

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 20, 2019, 02:45:07 pm
content: no. today your first oscilloscope is Rigol DS1054Z, one day you will thank it for the extra 2 channels. and its upgradable to 100MHz unit through simple hack (DS1104Z), 50 - 100 MHz is more than enough for almost anything happening around here including audio. if you get DS1052E, you'll be sorry for the lack of 2 channels and near obsolete oscilloscope.

author: TiN
author_rank: Super Contributor
timestamp: May 20, 2019, 04:47:39 pm
content: This thread should be in T&M forum, not here, unless you want to calibrate or discuss accuracy of your new scope.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 20, 2019, 06:14:06 pm
content: I would get a DS1052E or a DS1102E as a first scope if the price is right. They are very well built machines that allow you to do a lot in the absence of a complete scope.To me, the price you mentioned is too high when compared to the DS1054Z mentioned by Mechatrommer. If you can find a unit in good condition for 100 (maybe 150 Euros if it is in really good condition), that is certainly worth it.

author: xrunner
author_rank: Super Contributor
timestamp: May 20, 2019, 06:26:39 pm
content: Quote from: terumi on May 20, 2019, 02:23:54 pmHad to convert the value to dollars ($278) so I could answer, but agree with the others - NO.Now, if the price was low enough, I guess for a first scope sure. But it'd have to be WAY lower than that price. WAY lower.

author: tv84
author_rank: Super Contributor
timestamp: May 20, 2019, 06:36:32 pm
content: Quote from: terumi on May 20, 2019, 02:23:54 pmI sold mine a week ago for 180€. In that money range go for the DS1054Z.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: May 20, 2019, 06:43:47 pm
content: Quote from: terumi on May 20, 2019, 02:23:54 pmThe DS1052E WAS a nice beginner scope a few years back... that's why I bought one. Don't buy one now... go straight to a DS1054Z.

author: Fungus
author_rank: Super Contributor
timestamp: May 20, 2019, 06:49:33 pm
content: Quote from: TiN on May 20, 2019, 04:47:39 pmNo, it should be here.

author: Fungus
author_rank: Super Contributor
timestamp: May 20, 2019, 06:53:49 pm
content: Quote from: terumi on May 20, 2019, 02:23:54 pmYou can get one cheaper than that:https://www.batronix.com/shop/oscilloscopes/Rigol-DS1052E.htmlQuote from: NivagSwerdna on May 20, 2019, 06:43:47 pmYes. A DS1054Z is only about 75 Euros more and it's aLOTbetter.https://www.batronix.com/shop/oscilloscopes/Rigol-DS1054Z.html
Are there oscilloscopes that can have their sample rate increased by doing this? - Page 1
Forum section: electronics / testgear

author: Plasmateur
author_rank: Regular Contributor
timestamp: May 18, 2019, 05:30:05 am
content: Let's say I have a pulse delay generator, an oscilloscope, and a signal generator which are tied to a 10MHz clock.The scope has a sampling rate of 1Gs/s, so dt is 1e-9 seconds.I have a repeatable waveform generated by the signal generator that is triggered by the pulse delay generator. The scope is also triggered by the pulse delay generator.The first acquisition takes place, several waveforms are averaged and the data is stored.I then take a second acquisition, but this time the pulse delay generator offsets when the oscilloscope is triggered, with respect to the signal generator by dt/2.I then take both acquisitions and interleave them, which should have given me twice the original sampling rate.1.) Is this method used by anyone here? I'm guessing if this works, it should only be done on equipment that can be referenced to a 10MHz clock.2.) What is the limit this can be taken to? Would this be limited by the device with the highest jitter?3.) If you have done this before, what scope did you use and how far above the base sampling rate could you achieve?I understand this isn't any good for increasing the bandwidth of a scope. It's more of a niche case in which I would need to do this.

author: oPossum
author_rank: Super Contributor
timestamp: May 18, 2019, 05:43:05 am
content: Every DSO with ETS (equivalent time sampling) does essentially what you have described.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: May 18, 2019, 06:09:02 am
content: Like oPossom said, equivalent time sampling works this way. There's also a whole category of scopes called "sampling scopes" that do exactly this. It's good for signals that are repetitive and don't vary from cycle to cycle. They are commonly used for optical test.

author: David Hess
author_rank: Super Contributor
timestamp: May 19, 2019, 11:36:07 pm
content: Quote from: Plasmateur on May 18, 2019, 05:30:05 amLike the others say, you have reinvented equivalent time sampling.QuoteIt is limited by the trigger to sampling jitter. 50 picoseconds of jitter (20 Gsamples/second) is not too difficult to achieve but better requires attention to detail.QuoteTypically the sample rate is increased by 5 to 100 times. Dedicated sampling instruments might increase the base sampling rate by millions or even 100s of millions of times. My personal record is 500 million and the acquisition took hours to complete; it was more of a "I wonder if this is possible to do" experiment rather than something practical.
Knick S12 saved from destruction - Page 1
Forum section: electronics / testgear

author: Kjelt
author_rank: Super Contributor
timestamp: May 17, 2019, 06:44:08 pm
content: So again by visiting the metal scrapyard I could save an "antique" electronic device from destruction.This time it is a Knick S12 millivolt precision power supply.After a fast clean of the exterior I noticed the whole casing except for the front plate is one piece of metal.Nice quality.

author: Kjelt
author_rank: Super Contributor
timestamp: May 17, 2019, 06:45:49 pm
content: Opening it up on the backside of the front plate there is this large multiturn potmeter which looks way more impressive than todays blue/black Bourns multiturns.The selector switch with the adjustable resistors mounted around them looks still shiny as if it was made last week.At the back of the inside to the left is a small transformer a large precision resistor of 1kohm and a aluminium box with the powersupply in it (probably).I haven't took it out and opened it (yet).

author: Kjelt
author_rank: Super Contributor
timestamp: May 17, 2019, 06:47:41 pm
content: To the side of this aluminium box there are two cards with the quality control paperwork.They reveal the date of manufacture: january/february of 1970.WOW almost 50 years old.Would it still work ?Only one way to find out: power it up.Yes....... 50 years old and still running, amazing......

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 18, 2019, 01:10:26 am
content: It seems to reveal that your fluke is slightly out of cal. though

author: Kjelt
author_rank: Super Contributor
timestamp: May 18, 2019, 06:53:40 am
content: I already purposely did not post in the nanovoltnuts board

author: Vgkid
author_rank: Super Contributor
timestamp: May 18, 2019, 09:14:31 pm
content: Thanks for the teardown. Wouldn't surprise me if they used cd solder for the lower ranges.What is the lowest range for the unit?Here is my nv source.https://www.eevblog.com/forum/metrology/keithley-260-teardown/

author: Kjelt
author_rank: Super Contributor
timestamp: May 19, 2019, 12:52:56 pm
content: Quote from: Vgkid on May 18, 2019, 09:14:31 pmLowest scale is 0,05 (range: 0-500uV) , highest scale is 1000 (range: 0-10V)QuoteLooks very nice

author: Kjelt
author_rank: Super Contributor
timestamp: May 19, 2019, 01:53:23 pm
content: And set 1V on the 1000 scale on an uncalibrated Keithly 2000 and with the scale dial just turning it down one scale at a time till 0 (last picture).For the very attentioned people I made an error with the 0,5V picture so had to redo that one.

author: guenthert
author_rank: Frequent Contributor
timestamp: May 20, 2019, 03:53:47 am
content: Quote from: Kjelt on May 19, 2019, 12:52:56 pmThat's an astonishing wide range. Good find!
HP 54645D CH A2 no response when its vertical position knob rotated - Page 1
Forum section: electronics / testgear

author: Test Point
author_rank: Newbie
timestamp: May 16, 2019, 09:33:48 pm
content: Greetings all...New guy on the forum. I ran across this forum while I was searching for any hints as to repairing the problem with the scope.I've been an E Tech for over 35 years repairing pro-sound equipment so I'm not afraid to tear into this if I need to. I can't seem to find a "real" service manual on this yet. I'll need to contact HP/Agilent and see if I can get one.Long story short...the place I work at was getting rid of this scope because of the problem noted in the subject line. I figured I'd check here first rather than reinvent the wheel and see if someone can point me in the right direction. The A1 channel works fine so if I need to, I can do an A-B comparison and see where the signal is going bonkers.Thanks

author: PaulAm
author_rank: Frequent Contributor
timestamp: May 17, 2019, 12:41:40 pm
content: There is no service manual for this scope other than "replace board ...". Unfortunately HP never released any schematics.I have one of these but I've never opened it up so this is just a guess. Those things are just rotary encoders, so it could be a bad encoder, bad connection or, worst case, something on the main board. You could open it up and swap the Ch1 and Ch2 vertical encoders and see if the problem follows.I think the odds are good for a bad encoder but you won't know until you open it up.

author: Test Point
author_rank: Newbie
timestamp: May 17, 2019, 01:26:15 pm
content: Quote from: PaulAm on May 17, 2019, 12:41:40 pmMy thoughts too on it being the encoder. I have read that it's not hard to get to this part so I may do that this weekend. When I rotate the encoder either way, I can see the trace "trying" to move but it never moves off the X axis center line. If it turns out to be the encoder, I'm hoping that it has a manufacturer's p/n on it. If I'm lucky, it may be an off the shelf part.

author: Test Point
author_rank: Newbie
timestamp: May 19, 2019, 06:58:14 pm
content: Well crap...I swapped out the 2nd channel encoder for the first and no cigar. It still does the same thing. Without a schematic to be able to troubleshoot this, I'm guessing this will be relegated to being a single sweep scope. These can be had relatively cheaply so I won't put any money into it.At the same time I was given this one, I was also given an Agilent 54622D as well that works great so that one will replace the venerable Tek 465 that has been on my bench for 20 years. The v/d contacts and the vert position pots on the 465 scope are all wonky so eventually I will tear into that and clean things up.I do mostly audio repair so I don't need anything real fast. The 465 fit the bill perfectly for the years it was being used.
HP 1142A transformer voltage - Page 1
Forum section: electronics / testgear

author: Justincase1979
author_rank: Contributor
timestamp: May 16, 2019, 07:55:59 pm
content: Hi everyoneJust received a HP 1142A probe power module I bought off eBay, just to discover someone have removed the toroidal transformer... Did get it very cheap, now I know why!My question is whether anyone know what voltage the secondary is? Maybe someone could be bothered to measure it if they have the same unit?Sent from my Pixel 2 using Tapatalk

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 16, 2019, 08:49:11 pm
content: Hi,The manual is available here:http://literature.cdn.keysight.com/litweb/pdf/01141-97002.pdfThe transformer is part number: 9100-4750The schematic is here:A transformer that has a 15V secondary is a good place to start.Regards,Jay_Diddy_B

author: Justincase1979
author_rank: Contributor
timestamp: May 19, 2019, 04:24:00 pm
content: Thanks for the link to the manual, will order a 15v transformer of eBay and give it a try!Sent from my Pixel 2 using Tapatalk
Current sensor for domestic power logging - Page 1
Forum section: electronics / testgear

author: AndyC_772
author_rank: Super Contributor
timestamp: May 18, 2019, 07:20:36 am
content: Hi all,I'm interested in getting some idea of how much power each circuit in my home is using, on average, over time. I don't need great accuracy, just some idea of where the big loads are which might be worth trying to reduce.One way to do this would be to log the current using a clamp meter. It's important that it be able to record measurements at regular intervals over a period of time for later analysis.I already have a Fluke 289 which has logging capability, so another option might be to use a separate current sensor with a calibrated output, and use them together.Can anyone please suggest a clamp meter with logging capability, or a clamp-on current sensor, which might be suitable?

author: trobbins
author_rank: Frequent Contributor
timestamp: May 18, 2019, 12:48:09 pm
content: I've used the LEM AT series of self-powered clamp-on isolated sensors as input to PLC analog channel. The input resistance of the measuring device/logger or whatever needs to be high for rated accuracy, but can be lower if you want to calibrate the achieved readings, but can't be really low. Simple to set up, but you do need access to phase leads in the switchboard (eg. from distribution fuses or cbs), and although they are pretty small, there often isn't much room behind a switchboard panel. You can then use any logger of choice.

author: genghisnico13
author_rank: Regular Contributor
timestamp: May 18, 2019, 05:44:24 pm
content: There are a lot of cheap (<5 dollars) current transformers on ebay/aliexpress, they are cheap enough to see if they are adequate for your needs. Of course you would measure Apparent power with the simplest approach of measuring the current and multiplying by the nominal voltage.If you want a more permanent solution, perhaps something like:https://openenergymonitor.org/could be for you.

author: kripton2035
author_rank: Super Contributor
timestamp: May 18, 2019, 07:27:34 pm
content: I count the pulses on the mains counter device. 1 pulse = 1Wh.send the pulse count each minute to thingspeak.comthis way you get a global view over time of your current consumption.then, if I need better precision, I will add current transformers like below on each circuit breaker.https://www.ebay.com/itm/5A-Range-Single-Phase-AC-Current-Transformer-Sensor-Module-for-Arduino/232548663694
Agilent/HP 82357B + HP 8903B + Pete Millett's tools / VEE - Page 1
Forum section: electronics / testgear

author: Rax
author_rank: Super Contributor
timestamp: May 18, 2019, 02:01:39 pm
content: Hi all,Discussed here before, though there's always a quirk or a new software situation or whatnot - I couldn't really find a solution in previous treads, though maybe I missed something.In a nutshell, I am trying to connect things together as mapped in my subject line. Issues:Is there - still - a free version of the VEE environment? If not anyone knows the cost, ballpark? I requested a quote, but am very curious what everyone else has been doing on this.I am pretty sure I have a genuine GPIB interface. Upon installing the software, no VEE package was there to be found. Should I expect this on the bundled CD?Upon using VEE Pro 9.33, I was able to command the HP 8903B, and everything seemed to connect just fine. Pete's tools were not doing anything though. I guess when I get to that juncture my questions will be better, but is there some secret to making them run under the VEE environment?Thank you all for your input!Radu.
E7405A EMC Spectrum Analyzer vs. E4408B - Page 1
Forum section: electronics / testgear

author: Dr.Virus
author_rank: Newbie
timestamp: May 18, 2019, 02:13:36 am
content: Hi, Long time lurker, first time poster =)So It seems the stars have aligned and I've been offered to be notified when a particular piece of test equipment is to be dumped into the electronics recycling bin.The unit is a Spectrum Analyzer written off as "BER" (Beyond Economical Repair) and apparently due to rules that are beyond my comprehension, the lab tech says their only course of action are to either donate it or 'dump' it, as selling/auctioning it is not an option.The unit in question is..... anE7405A EMC Spectrum Analyzer, 9 kHz to 26.5 GHz!!, He said he was told by his predecessor that someone once upon a time had mistaken the unit for its similar looking E4403B cousin and fed DC into the RF input(E4403B has 100V DC tolerant input, while E7405A is 0VDC) and apparently this unit has been sitting on the top shelf collecting dust for the last 20 years written off as 'broken'.When the unit was shown to me last week, it didn't power on. But I stayed after work today (as I'd prefer not to be seen taking apart a bunch of test equipment in the lab lol) and played musicalchairsPower-Supplies with another BER unit and Lo and Behold! it Powers up! AND it seems to work perfectly fine?!?! Although I only had time to run a self check, and a readout with it's own 50MHz ref fed back to itself... I quickly chickened out and replaced the power supply ASAP, as to anyone walking by, it would probably look like I was tearing apart all their carefully calibrated equipment lolIt does throw a minor error, something about System alignment, all needed now, blah blah... but I noticed the time was Dec 0, 0 and 0 o'clock so I'm sure its just the cmos/RTC battery being drained which seems pretty common for these units of such vintage.I guess My question is.. Does an EMC Spectrum Analyzer work as a a 'normal' Spectrum analyzer? Is it just an E4408B with an EMC persona, ..possibly a superset of the ESA E440X? or does it lack certain functions so HP/Agilent/Keysight/XXX can sell you bothI don't really need/care about the EMC stuff, my home bench is missing a spectrum analyzer and a one with 26GHz range would be my crown jewel. I'd probably set the thing on my night stand just so its the first thing I see in the morning (although I think GF would protest)
Klein RT310, GFCI-AFCI tester - Page 1
Forum section: electronics / testgear

author: IvoS
author_rank: Frequent Contributor
timestamp: May 19, 2019, 07:56:35 pm
content: Not a common tester for you EE guys here, but I want to share my experience. This is 120V AC receptacle "quality" tester for US market. GFCI testers are pretty cheap and you can get them for a few bucks in almost any major retailer store. Now, how about the AFCI (arc-fault-circuit-interruptor) testers? The NEC (national electrical code) originally required the arc fault breakers to be installed in bedrooms and sleeping areas when they were introduced to the market around 2004. These days AFCI breakers are required to be installed almost everywhere in the house including kitchen and for appliances like dishwashers, disposals etc. As you can see from the pictures, to test the AFCI breaker, there is little bit more involved in the tester itself. This tester failed the same day it was purchased. Only couple of test were done and the fuse blew. it is 10A 5x20 fuse. What was strange is that, when testing the AC receptacles, there was a 50% chance the receptacle (or the breaker) wouldn't trip when test was done compared to other receptacle on the same circuit that the breaker did trip when tested. The tester runs on 3 AAA batteries, so it powers on and looks like everything is fine but it can not test with blown fuse. When plugged in, it looks like there is no power present in the receptacle but in fact the receptacle is live. They cover their ass in manual, it says "Test before use on known live circuit". So if your ass gets fried because you think the circuit is dead, it is your problem and you should read the manual and should know better.I just personally think they could do a little bit more from engineering point of view to include a check LED for self diagnostic of the tester or LED that checks the fuse. It is very impractical to verify if the tester is in working order every time before you test the outlet especially if you have to test 200 of them!Anyone can reverse engineer from the pictures the way it simulates the arc fault?
Hameg HM1008-2 vs SDS1202X-E - Page 1
Forum section: electronics / testgear

author: MM0SDK
author_rank: Newbie
timestamp: May 17, 2019, 12:08:20 am
content: Hi all, my first post here and looking for some possible advice please.I am bidding on a 100MHz Hameg HM1008-2 Combi-scope at the moment as my first scope. I learnt the basics on an Analogue Hameg back in the 90's in college and it's only now I'm investing in a scope.My problem is, I'm not sure what would be a sensible highest bid for such a scope given that it is in a very clean, hardly used condition. I may have an offer of a used Siglent SDS1202X-E in a few weeks for around £200 - £250, so not sure if i would be better holding off for that. Just wondering what others thoughts would be on this, with vastly more experience than myself.Much appreciated.Thanks.
Robust oscilloscope probes - Page 1
Forum section: electronics / testgear

author: k.valentino
author_rank: Contributor
timestamp: May 16, 2019, 10:43:57 am
content: Hi,need more robust oscilloscope probes (not too expensive) - forautomotiveand general testing.My scope is Micsig TO1104 (with 4 probes 10:1Micsig P130A). In most cases, I use it for automotive tests and car module repairs, but sometimes I also repair electrical appliances and devicesI seen good references forTestec TT-HV 150probe (1:100high-voltage probe– 1.5 kV), is it ok for automotive and general use?Or it is better to buy the most common 1:10 probes - like thisTestec TT-MF 312?What would you recommend?

author: tautech
author_rank: Super Contributor
timestamp: May 16, 2019, 11:16:29 am
content: If they're gunna get beaten up then the cheapest you can find will work just fine.Let a P6100 probe search on eBay be your friend.

author: David Hess
author_rank: Super Contributor
timestamp: May 16, 2019, 02:44:02 pm
content: In my experience, high impedance x100 probes are more difficult to use in place of x10 probes in general purpose applications. They are more finicky and tend to pick up more noise so I only use them when required.Tektronix used to make heavy duty oscilloscopes probes so you might look for something like that. This one from Probe Master is the only thing I found in a quick search:https://probemaster.com/3900-series/Those P6100 probes that Tautech mentions are cheap but also pretty fragile. Still, you could probably buy 4 of them for the price of the next cheapest good probe.
Agilent 54624a any good? - Page 1
Forum section: electronics / testgear

author: yo0
author_rank: Regular Contributor
timestamp: May 14, 2019, 05:44:10 pm
content: i have the opportunity to buy an Oscilloscope Agilent 54624a in near mint condition. any opinions about this model? it is better than a tektronix 465?any comments will be really appreciated.best regards.Pio

author: gslick
author_rank: Frequent Contributor
timestamp: May 15, 2019, 01:26:04 am
content: Dave did a video about the Agilent 54622D five years ago, back in March 2014EEVblog #591 - Agilent 54622D Retro Mixed Signal Osciloscope Review & TeardownThe difference between the 54622D that is the subject of that video and the 54624A you are asking about is that the 54622D has 2 analog channels plus 16 digital channels, while the 54624A has 4 analog channels and no digital channels. Both are 100 MHz, 200 MSa/s, 4MB sample length scopes.Agilent Technologies 54600-Series Oscilloscopes Data Sheethttps://literature.cdn.keysight.com/litweb/pdf/5968-8152EN.pdfIf the price is right a 54624A could still be a perfectly usable scope, depending on what you need.

author: yo0
author_rank: Regular Contributor
timestamp: May 15, 2019, 02:41:23 am
content: Quote from: gslick on May 15, 2019, 01:26:04 amthank you, the asking price is approx 150 usd, the main use will be for analog and audio stuff. i wonder if the tek 465 is a better equipment despite the cursors and readouts in the agilent.best regardsPio

author: siggi
author_rank: Regular Contributor
timestamp: May 15, 2019, 10:24:58 pm
content: As a first or only scope, I'd go for the 54624a every day of the week. IMHO analog scopes are more pleasant to use. There are however things you can do with a digital scope that an analog scope just won't do, such as looking at slow or one-time events and looking at pre-trigger signal.The 54624a also will do automated measurements for you, it has much more capable triggering than the 465 and it can do FFT - it's not super-awesome, but it does it.I have a 54622D, and while my Tek 2467 is my favorite scope in usability, I can say I don't hate the usability of the 54622D. It drives pretty much like an analog scope...

author: yo0
author_rank: Regular Contributor
timestamp: May 15, 2019, 11:30:42 pm
content: Quote from: siggi on May 15, 2019, 10:24:58 pmthank you very much, i will buy itbest regardsPio