hybridfree/eevblog-posts huggingface dataset:
To 34465A owners, what do I need to buy, to get oscilloscope functionality? - Page 1
Forum section: electronics / testgear

author: ivonenand
author_rank: Contributor
timestamp: November 20, 2016, 11:40:33 pm
content: Hi guys,I'm considering purchasing a Keysight 34465A, but before I do that I need to get the whole picture of what I'm paying for. I often do battery powered wireless sensors with low power modes. Usually the sensor wakes up every minute or so, takes measurements and sends data. They use a few uA in idle and a few mA when active. I need to measure the power consumption during the active phase (which is about 1s long). So I need a DMM that can trigger on rising edge, sample and record the data - basically a slow current-mode oscilloscope. The 34465A seems to have everything I need, but exactly what options I need to achieve that aren't that well documented. To be exact, do I need to buy:- BenchVue Digital Multimeter App Pro (here I don't know exactly what exactly the "Digitizer functions" mean)- 3446DIGU Upgrade (do I need Advanced Triggering for rising edge triggering?)Thanks for any input in advance,Ivo

author: nctnico
author_rank: Super Contributor
timestamp: November 20, 2016, 11:49:10 pm
content: Perhaps a Keysight Mobile communication source (=precision power supply) and the associated software is a much better tool. These are power supplies which can measure currents very precisely as well and make fast recording. Look at the end of the 'Agilent 66311B poor man's SMU thread'. The mobile communication sources are geared towards characterisation of battery powered devices (and their wildly fluctuation current draws).https://www.eevblog.com/forum/testgear/my-poor-mans-smu-the-agilent-66311b/msg1040279/#msg1040279

author: ivonenand
author_rank: Contributor
timestamp: November 21, 2016, 06:36:10 am
content: Hi,Thanks for the suggestion, though I just gave one example of use. I still need a new DMM for the "regular" stuff DMMs do.Regards,Ivo

author: Dr. Frank
author_rank: Super Contributor
timestamp: November 21, 2016, 06:43:33 am
content: For digitization up to 50kHz (DCV and DCI modes), and triggering, you'll need the DIGU option. This includes advanced trigger options.The 2MB memory option is for free, currently, and highly recommended for that purpose.BenchVue is ok for standard measurements, but has some problems when transferring fast signals, so it's not very usable when making 50kHz and > 1MSa measurements.See 34465/470A and BenchVue threads.Frank
UNI-T UT61E Simple Backlight Mod Help - Page 1
Forum section: electronics / testgear

author: mozcelikors
author_rank: Contributor
timestamp: November 26, 2016, 11:23:56 am
content: Hello guys,I recently bought UNI-T UT61E meter with the suggestions from EEVblog, very happy with it.I've seen a lot of mods that adds backlight with touch sensor to it.I dont have so much time for modding.I need to add simple backlights (prefereably whatever LEDS he uses in this one, it looks amazing:https://www.youtube.com/watch?v=0XJloF0Pcc8&feature=youtu.be)All I need is when you switch on the meter, it stays on until you turn it Off. I dont need a sensor control for it.How can I do such simplest mod given the information? I dont have experience hacking these meters. Can the guys with experience help me?I need information like, what kind of LEDs I need to make it look as good as in the video I provided, what resistors, and where do I hook it up. I hope it's that simple as I do not have much time to do a complex mod.Thanks in advance... Any help is appreciated greately..A good reference:http://www.diyaudio.com/forums/equipment-tools/257668-uni-t-ut61e-dmm-backlight-mod.html

author: Shock
author_rank: Super Contributor
timestamp: November 26, 2016, 12:09:11 pm
content: If you look at this video. Ira T explains he uses 2 LEDs at the base of the display, in series, and connected (via switch) to a resistor and then to the battery.Then if you read Ni5ei's post. Right below the negative battery contact on the board is a terminal labeled "V+" This is the 9V from the battery but switched on/off by the rotary dial. If you'd taken your + for the LED's from there it wouldn't be possible to leave the backlight switched on when you power the unit off.?You can find photosfrom this thread hereshowing where to mount the LED's.So turn the meter on, backlight comes on. Turn multimeter off backlight goes off. Possibly the simplest circuit you can use, aside from the possibility of getting specific voltage LED.As to what LED's to use you can use anything that will fit. If you don't know set yourself a challenge to learn how to power them and change their brightness with a resistor.

author: mozcelikors
author_rank: Contributor
timestamp: November 26, 2016, 12:15:33 pm
content: Thanks for the really helpful answer.The reason I asked about the resistors was , since the same power goes into the circuity, I didnt want to damage anything due to overcurrent-draw.

author: mozcelikors
author_rank: Contributor
timestamp: November 26, 2016, 02:36:12 pm
content: Done already guys, check the attachment.2x SMD LEDS white, and a 100ohm resistor in series.Do you have any advice for power saving or something?

author: joeqsmith
author_rank: Super Contributor
timestamp: November 26, 2016, 05:06:52 pm
content: Quote from: mozcelikors on November 26, 2016, 11:23:56 amWell, you could turn it off.
EMI problems @ 310MHz - Page 1
Forum section: electronics / testgear

author: SHristov
author_rank: Newbie
timestamp: November 18, 2016, 08:47:11 am
content: Hi everyone,I'm working on project for information cluster. After one of the last EMI test we got report that when they turned on 310MHz@30V/m one of the internal monitoring systems kicked in.That means that we have problem with the communication buses or some external IC is failing.The problem is that the lab is in Germany and I'm in Bulgaria, and on top of that, we don't have any recorded logs and the next test is after 4 weeks.Now my idea is to make some improvised EMI chamber, where I can test the device.Does someone have experience in building one of these ?I tried with one clock generator 10~250MHz, but I don't think, that I will be able to get the desired power output without any termination and proper antenna.The "antenna" was directly next to the board, but the device was working fine.p.p.I was following Dave's videos for quite long time, but now I'm happy that I finally joined the forum.

author: MF-jockey
author_rank: Regular Contributor
timestamp: November 18, 2016, 11:31:26 am
content: 30V/m is a lot of RF energy! A picture of your solution will be helpful to think about your problem.Have you an outside cable or wire with a quarter wave-length (round about 25 cm at 310MHz) going to sensible electronic parts?May be you need a Faraday cage.

author: nctnico
author_rank: Super Contributor
timestamp: November 18, 2016, 12:30:59 pm
content: I high power tool with a series motor (like a 2kW angle grinder) is quite good in producing lots of RF interference at switch on. Not scientific at all but it may do the job. Otherwise you'd have to try and rent a local lab.
DSOXGPIB on Agilent / Keysight DSOX - Page 1
Forum section: electronics / testgear

author: matthieu.e
author_rank: Regular Contributor
timestamp: November 17, 2016, 09:32:40 pm
content: Hi,I would like to know if we have any schematic or DIY board on the DSOXGPIB add-on card for the Agilent scope ?Did someone open one ?Thanks
New Simpson 422 and HP Oscilloscope - Page 1
Forum section: electronics / testgear

author: eccoblackfin
author_rank: Newbie
timestamp: May 04, 2015, 08:56:29 pm
content: Hello all! This is my first post to the forum, and I've got a few questions on my equipment. First off, I have a Simpson 422 function/sweep generator, and it works beautifully. Almost. The square waves are near-perfect, as are the triangle waves, and the sine waves are..well, they're also triangle waves. Where do I start with this? My gut feeling is a leaky/bad filter cap somewhere, but I have only little experience in these things(I bought it to help do the labs for class). I've had utterly no luck finding a repair manual, or even a schematic, anywhere(anyone here have one handy?). I can provide a picture tomorrow, if necessary.And my HP 54200A oscilloscope. This thing is also near perfect..although the fan is quite noisy. The other issue is that it won't turn on unless grounded..and if ungrounded, it leaves you with a pretty nasty shock. Any ideas on where to look for this ground fault?Thank you much for your help, everyone.

author: barry14
author_rank: Regular Contributor
timestamp: May 04, 2015, 09:28:23 pm
content: The Simpson 260 site, simpson260.com, has a schematic of the Model 420 Function Generator which may be helpful.

author: dom0
author_rank: Super Contributor
timestamp: May 04, 2015, 09:30:22 pm
content: Quote from: eccoblackfin on May 04, 2015, 08:56:29 pmThere will be a network of some resistors and diodes (a sine shaper), it's probably broken one way or another.Or maybe just the switch for waveform selection is stuck, dirty, ...Quote from: eccoblackfin on May 04, 2015, 08:56:29 pmSee the manual of the device ; it must be operated with grounded socketsonly. Don't float your scope.

author: eccoblackfin
author_rank: Newbie
timestamp: May 06, 2015, 04:08:53 pm
content: Thank you for the suggestions. I was hoping someone had the schematic for that particular generator, because I don't think that the sweep function and such is just an add-on to the standard 420. I'll study it more in-depth later this week. And I'll poke around and see if I can find this 'sine shaper'. It'd be nice if it was just a bad diode that could be swapped out with ease.As for the scope..it wasn't really my intent to float it(this was the first time I powered it on, just to see if it worked..didn't have a probe in it or anything), but I don't think it should be using the ground as a current path.

author: eccoblackfin
author_rank: Newbie
timestamp: November 17, 2016, 12:21:53 pm
content: So, despite raising the long past dead post on this one, I thought the update would be useful. I contacted Simpson instrument, and asked them nicely if they could simply scan and email a PDF of the original service manual for the 422 function generator (for free). They happily obliged!I'll be sending it to the Simpson 260 site likely today or tomorrow, but in the meantime, if anyone would like a copy(or could tell me how to attach a 7mb file to a post here) I'd be happy to share it with you.
Fluke 8840A Bench multimeter behavior - Page 1
Forum section: electronics / testgear

author: mrt6644
author_rank: Contributor
timestamp: November 15, 2016, 02:18:21 pm
content: Hello, I just purchased a Fluke 8840A bench multimeter.I wanted to know if the following behavior is normal or if this thing is broken.I own about a dozen multimeters, all handheld except for a Rigol bench meter.With all of them, when testing DC voltage, after removing the probe from the test source, the voltage indicated on the display drops to zero or near zero.On the Fluke 8840A, after taking a DC voltage reading, and then removing the probe, the voltage stays at the measured amount, and slowly starts to decline by tiny increments.When touching the probes together it does return to zero or near zero. And when performing another measurement, it reads fine and accurately.Is this normal? I saw a video ob Youtube on the 8840A and it appeared that one did the same.Im trying to decide if I need to return the unit to the seller.Thanks

author: 2N3055
author_rank: Super Contributor
timestamp: November 15, 2016, 02:38:48 pm
content: It is probably in high impedance mode...

author: TiN
author_rank: Super Contributor
timestamp: November 15, 2016, 03:11:39 pm
content: I wonder how many times this question poped up on EEVBlog alreadyIt's normal.

author: mrt6644
author_rank: Contributor
timestamp: November 15, 2016, 03:24:19 pm
content: Thanks. Sorry for that. I expected that this might have been brought up before.I did a couple searches but gave up after a while. My bad.

author: Fungus
author_rank: Super Contributor
timestamp: November 15, 2016, 04:46:12 pm
content: Quote from: mrt6644 on November 15, 2016, 03:24:19 pmHint: Don't use the forum search, it's useless. Google "EEVBLOG xxx yyy" instead.

author: pelule
author_rank: Frequent Contributor
timestamp: November 15, 2016, 08:22:57 pm
content: Fully agree to both statements from Fungus.1. Behaviour is absolutely normal for suhc high impedance DMMs like the 8840.2. Use Google instead of the forum search, much better findings.PeLuLe

author: mzacharias
author_rank: Frequent Contributor
timestamp: November 16, 2016, 02:16:56 pm
content: Yes - normal. You can confirm this by manual ranging to the 200V range. At this range the input impedance is a more conventional 10 meg-ohm, and the voltage shown on the display will drop as soon as you remove the probe from the voltage source. Up to 20 volts, I believe the input impedance is around 5 gig-ohms.
Trouble removing the A.13 display board from the Agilent 66319B/D / 66321B/D - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: November 13, 2016, 04:15:13 pm
content: I am having trouble removing the display board so that I can fix the RPG (the rotary pulse generator/encoder). I can't figure out what is holding the display board to the plastic front, but it won't budge. I tried removing the hex nut that is holding the RPG to the plastic and that loosened it a little on that side. There don't appear to be any other screws or attachments, but something is holding the PCB firmly to the front face of the unit where the buttons are and it won't budge.I have removed the clear dark plastic panel on the front side and see the VFD inside, but cannot separate the circuit board from the front plastic. It will not budge, almost like it is screwed in somewhere. I've looked everywhere and under everything for the thing that is holding the circuit board firmly in place, but I just don't see it. The service manual is also of no help.If anyone's been able to separate the display board from the front plastic casing of the unit, please help.Images:Note: I peeled off the front plastic (damaging the bottom right corner as you can see). There are no screws under there.

author: SharpEars
author_rank: Unknown
timestamp: November 13, 2016, 04:39:14 pm
content: Update: I have added images to show the problem board that is stuck.

author: Micke
author_rank: Regular Contributor
timestamp: November 14, 2016, 07:43:53 am
content: If I don´t recall wrong, you must lift up the small PCB tab a little bit in the bottom center of the PCB, it locks the PCB in place.

author: Assafl
author_rank: Frequent Contributor
timestamp: November 14, 2016, 09:02:09 am
content: I don't have one of these so I offer this as a wild conjecture that comes out of a posterior (as a legally friendly disclaimer) -But just looking at the picture I am venturing a guess that what is holding it in place is the encoder. It looks as if the area around the encoder is somehow wedged against the front panel and prevents it from sliding out. Pushing against it, lifting it, or something similar may make it possible to push it sideways.NB - The second picture is upside down relative to the first picture. So you would slide the PCB to the right on the top picture but to the left on the bottom one...
EMF Survey Meter? - Page 1
Forum section: electronics / testgear

author: DenzilPenberthy
author_rank: Frequent Contributor
timestamp: November 14, 2016, 04:14:30 pm
content: Hi All,I'm being asked to look in to surveying our workplace to check compliance with the EMF directive. We are a university physics lab so have static magnetic fields, 50Hz power fields, RF sputtering equipment in the 10s of MHz, some microwave stuff and a workshop with welding equipment and some induction heaters in the 10s to 100 kHz.Does any one have any recommendations of a meter (or meters) to check this out with. I've done this kind of stuff at a previous employer but it was a while ago and I don't remember makes and models of equipment.I'm having a *really* hard time finding my way through the maze of websites who are trying to sell me things to keep gubberment mind control rays out of my brain!

author: plesa
author_rank: Frequent Contributor
timestamp: November 14, 2016, 04:40:19 pm
content: It depends on purpose why you needs to measure it.If it is related to new instrument installation, vendor needs to measure it anyway prior installation. Or you can ask some third party if it is related to your product compliance.In general you needs to buy spectrum analyzer and H/E field probes ( antenna ), this is relatively expensive.There are some handheld instruments but everything depends on your needs.

author: Neilm
author_rank: Super Contributor
timestamp: November 14, 2016, 07:33:41 pm
content: If this is a one off survey, it might be worth getting someone in. They would have the expertiese to do the assessment correctly and if you tell them what you have would come with all the correct equipment.

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: November 15, 2016, 02:48:11 pm
content: Check out Trifield or AlphaLab, Inc. Contrary to popular belief in the Ghost Hunting circles the Trifield 3-Axis EMF meter is a very good and accurate EMF meter for LF, RF and electric fields. I have several products from this company and love them! I use them in my lab often.https://www.trifield.com/
GF61 and MV61, what are they - Page 1
Forum section: electronics / testgear

author: sainter
author_rank: Regular Contributor
timestamp: November 13, 2016, 07:46:44 am
content: Hi,I have a pair of German made equipment and don't have an idea what they are. Does anyone know?

author: Andreas
author_rank: Super Contributor
timestamp: November 13, 2016, 08:01:45 am
content: Hello,a level-generator and a level-meter. (frequency 200 Hz-2.1 MHz)usually used for measuring "multichannel carrier transmission" (old telephone lines) according to:http://www.radiomuseum.org/r/praecitron_pegelgenerator_gf61_gf_61.htmlwith best regardsAndreas

author: sainter
author_rank: Regular Contributor
timestamp: November 13, 2016, 08:07:52 am
content: Are they good for something these days... anything else except a tear downEverything is good for a tear down.

author: babysitter
author_rank: Frequent Contributor
timestamp: November 13, 2016, 04:16:28 pm
content: And:http://www.radiomuseum.org/r/praecitron_universal_pegelmesser_mv6.htmlYou might want these instruments e.g. as transmitter / receiver for low frequency ham radio stuff, or testing filters in the given frequency range. Supression of ripple of switchmode power supplies, maybe?BRHendrik
Strange USB connector  - Page 1
Forum section: electronics / testgear

author: akis
author_rank: Frequent Contributor
timestamp: November 16, 2016, 04:30:32 pm
content: I have a weird USB connector it is smaller than the common micro-B which is used commonly on mobile phones it is just as thin but shorter. Is is not micro A or micro B, so what is it? I have attached a photo with it next to a standard micro-B connector.Many thanks

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: November 16, 2016, 04:44:45 pm
content: This?https://www.amazon.co.uk/Wired-up-HDMI-Mini-Male-Cable/dp/B00104UO88/ref=pd_lpo_23_bs_t_2?_encoding=UTF8&psc=1&refRID=YTWZV636Z3G4WX48K4PJOr not, I've seen that connector on cameras. Don't know the name. Could be Micro-HDMI?

author: Fred27
author_rank: Unknown
timestamp: November 16, 2016, 04:52:42 pm
content: What's on the other end? HDMI was the first thing I thought of, but not likely if the other end is USB.

author: Fraser
author_rank: Super Contributor
timestamp: November 16, 2016, 04:58:53 pm
content: What product does it connect to ?Sadly manufacturers such as ARCHOS use pseudo USB connectors that are proprietary in order to force owners to pay silly prices for optional cables. Some cameras use non standard USB connectors as well. A real nightmare to find a 3rd party connector that will fit.Fraser

author: AlxDroidDev
author_rank: Frequent Contributor
timestamp: November 16, 2016, 05:00:00 pm
content: In the OP's photo, the USB connector on the left looks a lot like Nikon's USB connectors that are used on several Nikon DSLRs.

author: akis
author_rank: Frequent Contributor
timestamp: November 16, 2016, 05:27:53 pm
content: It is USB, not HDMI. It is not square, it actually looks like a mini-micro-B

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: November 16, 2016, 05:36:30 pm
content: Well it's going to be one of these proprietary connectors on some cameras that outputs HDMI and/or USB.http://connector.pinoutguide.com/8_pin_UC-E6_like-mini-usb_proprietary/is the one posted by Alx.Not that one? Morehttp://pinouts.ru/DigitalCameras/

author: metrologist
author_rank: Super Contributor
timestamp: November 16, 2016, 05:56:19 pm
content: or maybe the new fangled USB C connector? But yeah, that last one...

author: akis
author_rank: Frequent Contributor
timestamp: November 16, 2016, 06:36:51 pm
content: Magnifying glass shows there are 8 pins! So it could be this one most likely...http://pinoutguide.com/DigitalCameras/sony_w310_usb_pinout.shtml

author: electr_peter
author_rank: Unknown
timestamp: November 16, 2016, 08:00:05 pm
content: I would guess it is semi custom 8 pin USB connector. Same as used in keychain camerasKeyCam #18 / #1080 AV Cable Pin AssignmentYou can find this connector on eBay.
Leeds & Northrup 4210 Manual Needed - Page 1
Forum section: electronics / testgear

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: August 05, 2015, 03:35:08 pm
content: I recently acquired a L&N 4210 Thomas type 1 ohm resistor from an auction. The seller offered it at a price too low to resist. My 34420A puts it in the ballpark of one ohm and most likely my meter is limited by its own accuracy to say what the true value is. The readings are very stable at room temperature after letting the resistor sit for a couple of days.I have yet to see one sell with the alpha & beta coefficients listed so I will need to get them determined by a reputable lab. Mr Pettis has already recommended a place that will calibrate my SR-104 and the price is about half what IET quoted me last year.Basically, I need to know any published specs for these resistors. Also, if anyone has any personal experience with annual drift rates and how well they work in an air bath, I would appreciate it. The instruction/care manual is non-existent and it would be great if someone could scan and upload a copy. Also, I am not certain if the typical oil bath is 20C or 23C.I have found several articles published from NBS/NIST and they seem to indicate that the drift rates of these resistors are in the sub-ppm range.I know the cost to determine the alpha/beta coefficients is not cheap, but it is a one time deal. Plus, the cost of $125 for the resistor with case makes it easier to spend the needed money on the cal and characterization.Thanks.

author: HighVoltage
author_rank: Super Contributor
timestamp: November 12, 2016, 09:58:58 am
content: I bought one of these as well, a few weeks ago and was looking for the manual as well.Not sure, if you found it by now, but interestingly, I fount it on TiN's website,https://doc.xdevs.com/doc/L%26N/Leeds%20%26%20Northrup%204210/3811_4210.pdf

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: November 12, 2016, 02:20:22 pm
content: I did find that one. My hope was to find more info on its typical characteristics outside of the annual drift. There is mention that it is sensitive to barometric pressure and that it has a relatively high TCR. I have not seen anything printed anywhere but I could probably find something in the NIST archives if I dig deep enough.I did come across an article from Jeff Gust when he worked for Verizon. It is a generic article but has lots of good information about alpha and beta calculations.http://www.rjbagan.com/pdf/Guide_for_Calibration_Standard_Resistors.pdfDo you plan on making an oil bath for yours? I have not done anything with mine. I have priced out getting a calibration performed but I believe they will also need to calculate the alpha/beta constants especially if it is going to be used in an air bath instead of an oil bath. The extra calculations will double the cost but it is a one time job.
BAD HP5342 Counter Sampler - Page 1
Forum section: electronics / testgear

author: TinkerGDS
author_rank: Contributor
timestamp: November 13, 2016, 08:55:47 pm
content: I thought I'd finally take apart and diagnose my HP5342 counter for a high frequency range problem. It's been working fine up to 520Mhz. Above that I have to set the switch and use the RF input. I will not measure anything on the RF input, I just get 0's on the display. After reading the test procedure in the manual and removing the sampler (5088-7022) and sampler driver, I discovered the sampler is bad. The sampler is the little gold cube with two SMA inputs and three wire output. One of the inputs comes from the Sampler Driver and one comes from the RF input. I cannot locate this part anywhere. Has anyone else been able to source a sampler or find a suitable replacement?

author: orin
author_rank: Frequent Contributor
timestamp: November 13, 2016, 09:19:42 pm
content: Quote from: TinkerGDS on November 13, 2016, 08:55:47 pmUnobtanium.The only place you'll find one is in a working instrument.There is a possibility that Luis Cupido can fix it. Seehttp://www.qsl.net/ct1dmk/
Identifying Test Equipment from Revox Service Specs - Page 1
Forum section: electronics / testgear

author: TinkerGDS
author_rank: Contributor
timestamp: November 11, 2016, 06:18:05 pm
content: I am an electronics hobbyist and love to work on vintage stereo equipment. One of the components I like to work on is Revox equipment. It is beautifully built and the service manuals are very well written. I can diagnose circuits, test and replace capacitors and some of the other more rudimentary tasks, like checking for broken solder joints.Now I want to take my electronics adventures to the next level and start actually aligning or calibrating the components I'm working on. I'm having a difficult time understanding some of the test equipment requirements. They ask for AF Generator (which I'm assuming is an arbitrary function generator, I could be wrong), an AF voltmeter (never heard of one of those), an digital voltmeter (I think I have that covered, but not at the millivolt level), Variable Ratio transformer-variac, RF voltmeter, and stereo demodulator.There is more test equipment listed, and I think I have those covered:o-scope (Tek 2645B)function generator with sweep (HP 8662A and Siglent 2122Xfrequency counter (Siglent 2122X and HP Spectrum analyzer 8568B)two Siglent Bench Multimeters (SDM3055)and Fluke 289 multimeterAny advice or direction is greatly appreciated.

author: nctnico
author_rank: Super Contributor
timestamp: November 11, 2016, 06:21:02 pm
content: AF=Audio Frequency. In other words: equipment usefull between say 1Hz to 20kHz with reasonable accuracy.

author: TinkerGDS
author_rank: Contributor
timestamp: November 11, 2016, 06:32:42 pm
content: Thank you. That makes sense. So the 8662 is out. The Siglent has a frequency span of 1uHz to 120MHz so that'll work.
Electronica 2016 TE news - Page 1
Forum section: electronics / testgear

author: tszaboo
author_rank: Super Contributor
timestamp: November 08, 2016, 06:28:38 pm
content: OK, so I wanted to share some news from the TE industry. I wasnt focusing on this today.Siglent and RS (* not Rohde & Schwarz, the distributor) signed some OEM contract, and you can buy RS Pro oscilloscopes, which are made by Siglent.http://uk.rs-online.com/web/b/rs-pro/test-measurement/oscilloscopes-accessories/So now there is a reputable sales channel for their product. The RS Pro lineup looked good quality, so I will definetly take a look at it.Rigol is coming with a new 1022Z AWG, picture below. It is an update for the 1022.Rigol is coming with an electronic load, it should hit the market early next year. I tried to squeeze the sales guy for some basic specification...I'll write an update tomorrow.
Heathkit Model O-12 Restoration - Page 1
Forum section: electronics / testgear

author: jcrubin
author_rank: Frequent Contributor
timestamp: September 15, 2016, 01:14:26 am
content: This thread contains the information regarding the Restoration of my Heathkit O-12

author: Paul Moir
author_rank: Frequent Contributor
timestamp: September 21, 2016, 05:01:57 pm
content: Just a thought regarding that 100 ohm resistor: the IO-12 has a near identical power supply setup but does not have that resistor. The output voltages are slightly lower and it uses a different rectifier tube, but the big difference I see is that the transformer has 330v windings rather than 390v ones. I wonder if they changed transformers at some point, or if you somehow got a IO-12 transformer in there?My IO-12 transformer is marked:54-103352450

author: oldway
author_rank: Super Contributor
timestamp: September 22, 2016, 03:30:49 pm
content: In tube circuits, you don't have to worry about ESR of electrolytic capacitor because currents are low and circuits are of high impedance.The only thing we did in this times was to check the ripple of the power supply.ESR is became very important with the switch mode power supply technology because of high frequency/high rms current ripple.In tube circuits, you have only 100 or 120 Hz ripple...But what I think is very important is to form the high voltage electrolytics capacitors again by applying slowly an increasing voltage with current limitation.NB: I had an IO12E when I was a teenager.....

author: jcrubin
author_rank: Frequent Contributor
timestamp: September 28, 2016, 12:52:50 pm
content: I will look more closely at the power transformer based on your information provided. Here is the 3rd video

author: jcrubin
author_rank: Frequent Contributor
timestamp: September 28, 2016, 09:53:06 pm
content: Quote from: Paul Moir on September 21, 2016, 05:01:57 pm54-26 138852 installed in this unit

author: jcrubin
author_rank: Frequent Contributor
timestamp: September 30, 2016, 01:24:06 am
content: Mounting evidence that the original build may have forgotten this resistor. Confirmed the transformer 54-26Confirmed that part in this edition of manualConfirmed this resistor included 1B-20Found Placement photo showing area for V8

author: jcrubin
author_rank: Frequent Contributor
timestamp: October 05, 2016, 10:00:10 pm
content: Next video posted

author: jcrubin
author_rank: Frequent Contributor
timestamp: November 07, 2016, 01:20:54 am
content: I herby submit video 8, the final video in the series in the two month restoration of the Heathkit O12 Oscilloscope. This has been a great project. Ive also included some Lissajous patterns in this video for all to enjoy!
Rigol 1102E scaling issues - Page 1
Forum section: electronics / testgear

author: jerryk
author_rank: Regular Contributor
timestamp: November 07, 2016, 01:56:14 am
content: I have purchased a Rigol 1102E and am confused about the way scaling affects the voltage readings. Example - If I connect a 9 volt battery and set the scale to 5 volts the voltage reading for the battery is 9.12 vdc. If I change the scale to 10 volts the voltage reading for the battery is 9.72 vdc. This kind of voltage variation is typical of all sources of DC/AC across the entire range on the scale dial. It's hard to tell which reading is real and the variations between each scale setting are considerable on all of the voltage reading available.I'm new to using oscilloscopes and i think I must be something wrong? At the moment if I want a true reading for a source I still have fall back on my multimeters which all read consistent and accurate.Jerry

author: tautech
author_rank: Super Contributor
timestamp: November 07, 2016, 04:37:07 am
content: Welcome to the forum.As a general rule when using OSD measurements use settings that use as much as possible of the vertical real estate. Some instruments are better than others in this regard but with entry level instruments do not expect DMM accuracy.On the other hand, in the time domain is where a scope shines.

author: Fungus
author_rank: Super Contributor
timestamp: November 07, 2016, 06:51:45 pm
content: Quote from: jerryk on November 07, 2016, 01:56:14 amYes, the device will have half the resolution if you double the vertical scale.For the most accurate measurements try to use as much screen height as possible (the input voltage range is mapped to the screen display).eg. For a 9V battery use 2V/div.
binding post to banana plug? - Page 1
Forum section: electronics / testgear

author: jeroen79
author_rank: Frequent Contributor
timestamp: November 02, 2016, 12:24:49 am
content: I'm looking for a binding post to banana plug adapter.Just something that I can easily put a wire on and that will go into a 4mm banana jack.The plug does not have to be shrouded but it should have an insulated part to hold it with.Any suggestions?Like these:I found some on ebay but there postage to me (Netherlands) is 3x the cost of a set of 2.Something similar would be plugs for speaker wire but I can't find these in an insulated variant.A push to open clamp would be good too.

author: ModemHead
author_rank: Frequent Contributor
timestamp: November 02, 2016, 11:48:40 am
content: Quote from: jeroen79 on November 02, 2016, 12:24:49 amPomona 1825 series plugs are very similar to these. They have set-screws instead of thumb-screws though.

author: knockbill
author_rank: Regular Contributor
timestamp: November 06, 2016, 04:12:16 pm
content: If the non insulated jacks are available locally, can you cover them with shrink wrap to use for your purpose?

author: nanofrog
author_rank: Super Contributor
timestamp: November 06, 2016, 07:10:31 pm
content: A Pomona 1286 or 5405 might be of interest (latter is the gold plated version).
Armaco SWR meter - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: November 06, 2016, 02:06:15 pm
content: I picked up a vintage Armaco SWR meter (70's CB era by the look of it)Looks like this:http://thumbs.ebaystatic.com/images/g/g2kAAOSwIgNXnk1i/s-l225.jpgNo data sheet, what frequency range should I expect this to work over?

author: LA7SJA
author_rank: Regular Contributor
timestamp: November 06, 2016, 06:52:13 pm
content: Most SWR meters of this type is 1.8MHz-30MHz, but I think you should use low power when testing.Johan-Fredrik
Rigol DS2000 series oscilloscopes - how to preserve settings across power cycle? - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: November 05, 2016, 08:44:24 pm
content: Sorry for the dumb question, but is there a way to get the DS2000 to automatically remember scope settings between power cycles?Right now every time I power up it's always at 1x probes, etc...a pain.I know how to manually load and save settings, but is there a way to make it automatically load settings at power-on?

author: Fungus
author_rank: Super Contributor
timestamp: November 05, 2016, 08:45:20 pm
content: It should just do it automatically...

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: November 05, 2016, 09:11:58 pm
content: Are you really too lazy to read the manual?"Power-off Recall"

author: Unknown
author_rank: Unknown
timestamp: November 06, 2016, 04:20:12 am
content: Quote from: CustomEngineerer on November 05, 2016, 09:11:58 pmI'm not too lazy, since I did read it, but I may be too stupid to understand the Chinglish, or too old and forgetful to have memorized everything I read, or too morally inadequate to just suffer with having to change the settings each time I start up without asking here for help. Or I just have some other personal failings you didn't mention.Anyway, thanks for the tip. Once I searched on "recall" in the PDF version I found theUtility>System>Power Onsetting. (Since this wasn't discussed in the Store/Recall section of the manual.)While I have your attention, anybody know how to set the pop-out menus to disappear by themselves after a timeout?(I'm sure it's somewhere, but it's not under "Operation MENU" in the manual. I'd happily proofread the manual for English if I thought Rigol would pay attention to the corrections. I actually emailed them a long list of corrections for an older model - never got any reply.)---------Added: Nevermind, I found it by brute force search.Display>MenuDisplay.

author: Fungus
author_rank: Super Contributor
timestamp: November 06, 2016, 09:43:30 am
content: Quote from: CustomEngineerer on November 05, 2016, 09:11:58 pmKids today! These days they expect to just be able to turn on a complex instrument with thousands of functions and startusingit. Back when I was a lad it took you a whole month of page turning and studying the schematics just to figure out how to power the thing on.You don't even have toreadmanuals these days. These days we have full online text search with regular expressions, etc.Quote from: Dave92F1 on November 06, 2016, 04:20:12 amDid that take twenty seconds, or thirty?

author: Bud
author_rank: Super Contributor
timestamp: November 06, 2016, 05:11:58 pm
content: Quote from: Dave92F1 link=topic=76938.msg1064748#msg1064748That will not save you from the stupid DS2000 thing forgetting its 50 Ohm input setting. It sometimes sets it right, sometimes it does not, and i could not figure out the pattern. It was easier to get rid of the stupid thing then fight with it.
Is it possible to trigger from the math channel on the Rigol DS1054Z? - Page 1
Forum section: electronics / testgear

author: Chumanista
author_rank: Contributor
timestamp: November 06, 2016, 02:10:14 pm
content: Hi!I have a really noisy input that needs a low-pass filter before it becomes usable (a lot of noise).Because of external rules I cannot use any external parts.Is there any way to do it? I googled but couldn't find anything.

author: JPortici
author_rank: Super Contributor
timestamp: November 06, 2016, 02:15:51 pm
content: you wish! you can however apply a filter to the trigger itself. in your case, select HF rejection on the trigger coupling

author: Chumanista
author_rank: Contributor
timestamp: November 06, 2016, 02:17:57 pm
content: I do wish indeed. The math option is so nice. I don't need a lot of resolution, so I could just record 5s to memory and filter it in Excel, but triggering of the already working function would be SO NICE. Why is it impossible? Calculation limitations?

author: JPortici
author_rank: Super Contributor
timestamp: November 06, 2016, 02:26:47 pm
content: math is calculated from on screen data, not from acquisition memory (even on much better scopes, unfortunately)

author: JPortici
author_rank: Super Contributor
timestamp: November 06, 2016, 02:28:45 pm
content: depending on your actual signal you can work out different ways to produce a more stable trigger. though i'm used working only with edge and pulse/window and by adjusting the holdoff
Tektronix 176 power pulsed high current fixture 200A, tear down. - Page 1
Forum section: electronics / testgear

author: harrimansat
author_rank: Regular Contributor
timestamp: September 27, 2016, 08:52:37 am
content: Hi, has anyone service manual for a Tektronix 176? Mine now works, but I would like to know how it works.http://www.vishay.com/docs/40021/wtintro.pdfWet Electrolyte Tantalum Capacitors

author: zener
author_rank: Contributor
timestamp: October 07, 2016, 12:49:26 pm
content: I picked up one of these devices for my 576. I figured "how complicated could it be?". Well,there is a lot of stuff in there. Plenty to go wrong. I too would like to get a service manual.I see some for sale postings for a manual for the 176 that say "some schematics". I am notsure what that means. Has anyone seen that manual?Pete.

author: Bill158
author_rank: Regular Contributor
timestamp: October 08, 2016, 04:51:46 pm
content: Quote from: zener on October 07, 2016, 12:49:26 pmI found this Tek 176 manual (pdf) somewhere, but I don't remember where. It appears to be complete but it looks like several pages of the schematics have been scanned twice so if you are going to print it and assemble it then you may have to pick and choose. I just uploaded it to the K04BB website. You can find it in the "Recent Uploads" section. The name is "TEKTR_176_OM_1.pdf"Bill

author: zener
author_rank: Contributor
timestamp: November 06, 2016, 12:20:59 pm
content: Thanks for posting it to K04BB but thinks seem to be backing up there. Could you send it to me directly?peter (the at char) reilley (the period char) comThanks,Pete.
hps140i mark 2 - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: November 04, 2016, 09:16:30 pm
content: The HPS140MK2 handheld oscilloscope still holds the same power as its predecessor, the HPS140, but in a new and modern design.Although small in size, this oscilloscope packs 40 MS/s in real time and it's sensitivity can go as low as 0.1 mV. It also has a full automatic measuring system but can be operated manually if preferrehttps://www.velleman.eu/products/view/?id=431482
E0503 vintage Signal generator - Page 1
Forum section: electronics / testgear

author: vasi_ro
author_rank: Unknown
timestamp: November 04, 2016, 02:08:31 pm
content: Teardown of a vintage signal generator Made in Romania.

author: vasi_ro
author_rank: Unknown
timestamp: November 04, 2016, 02:10:15 pm
content: More picture

author: vasi_ro
author_rank: Unknown
timestamp: November 04, 2016, 02:11:42 pm
content: some more pictures

author: vasi_ro
author_rank: Unknown
timestamp: November 04, 2016, 02:15:12 pm
content: last set
Bad continuity test? Crappy probes to blame?! - Page 1
Forum section: electronics / testgear

author: jaffers
author_rank: Newbie
timestamp: November 03, 2016, 12:36:26 am
content: Didn't really know where to put this but I thought it was interesting.Perhaps we shouldn't be giving DMM's a bad wrap for their continuity test and instead for their probes? Might be worth attention in future reviews

author: jaffers
author_rank: Newbie
timestamp: November 03, 2016, 12:43:14 am
content: Also shootout of 50 buck metersTL;DR Probes can make a huge difference but it's still worth testing the continuity

author: Muttley Snickers
author_rank: Unknown
timestamp: November 03, 2016, 01:03:31 am
content: Welcome to the forum.Yes, these videos have been posted here before a couple of times and if you are not sure then you can copy the Youtube video url and use the forums search feature, you can even have a set of leads that work just fine in a number of other meters and then for no apparent reason start having problems with the same leads in a different meter, this drove me nuts recently and I documented it in the supporters lounge, hadn't experienced it before and it turned out to be just a compatibility issue between a particular set of leads and a new meter that I bought.

author: Unknown
author_rank: Unknown
timestamp: November 03, 2016, 03:08:27 am
content: I just recently ran into the problem of defective mulitmeter probes. I purchased a Fluke 87V couple years back but haven't really used it much since i have a bench top unit I mainly use. Used it to test some low ohm resistors and discovered that that my readings were >2ohms off. Turns out the resistance on one of the fluke leads was the culprit. I isolated it down to the probe itself. I carefully cut away the molded plastic to expose where the probe tip is connected to the lead wire, hoping to isolate where the resistance was coming from. Of course, after exposing the wire/tip junction, the resistance went away and I really didn't learn the exact cause. The wire/tip connection is crimp only, no solder. Replaced them with the Probemaster probes which have a combination crimp/solder connection.
The most expensive knob replacement ever !! - Page 1
Forum section: electronics / testgear

author: snoopy
author_rank: Frequent Contributor
timestamp: November 02, 2016, 11:24:24 am
content: You don't want to lose any knobs on your Tektronix scope. They are very expensive to replace according to this seller on ebay !!http://www.ebay.com/itm/New-Tektronix-Oscilloscope-soft-knob-366-0859-01-DPO4000-DPO5000-DPO7000-DPO3000-/281705531839?hash=item4196f549bf:g:Q0IAAOSwBLlVZ4haNew Tektronix Oscilloscope soft knob 366-0859-01 DPO4000 DPO5000 DPO7000 DPO3000More than 10 available / 7 soldBuy Now Price of US $910.00 or make an offer

author: MadTux
author_rank: Frequent Contributor
timestamp: November 02, 2016, 01:25:41 pm
content: These threads are getting boring.Nothing special, seller dude is on holyday or whatever, so he set price high instead of canceling.Click on "7 sold" and see that he sold 7 knobs between 6-10$, nothing special, move on

author: bson
author_rank: Unknown
timestamp: November 02, 2016, 11:08:32 pm
content: Looking at the history, the seller accepted an offer of $6. So I'd offer $5 once they're back.

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: November 02, 2016, 11:33:52 pm
content: Maybe he's the guy bidding on the broken Agilent.
Marconi 2022  GPIB Manual - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: November 08, 2016, 05:20:53 pm
content: Does anyone have a GPIB manual for a Marconi 2022 signal generator. The GPIB manual was offered as an option (54811-010p)The Keysight connection expert can find it, but I don't have a clue about the commands. At this point I just need the ability to set frequency and amlpitude

author: Andy Watson
author_rank: Super Contributor
timestamp: November 08, 2016, 05:36:35 pm
content: Quote from: Jester on November 08, 2016, 05:20:53 pmI've never seen the GPIB manual, however, the operators' manual gives the basic codes - starting page 3-20.http://www.ko4bb.com/manuals/82.71.14.239/Marconi_2022E_Operators_Manual_A4.pdf

author: Jester
author_rank: Frequent Contributor
timestamp: November 08, 2016, 05:51:55 pm
content: Quote from: Andy Watson on November 08, 2016, 05:36:35 pmThanks for that, working just fine
Agilent N5181A signal generator power output software limited - Page 1
Forum section: electronics / testgear

author: jrgandara
author_rank: Contributor
timestamp: November 01, 2016, 07:31:33 pm
content: I friend of mine got a obsolete Agilent N5181A signal generator. For our surprise, the modulation (AM/FM) is not enabled and output power is also software limited. A signal generator without the basics modulation modes! The actual power output is +23dBm instead +33dBm.have anyone any clue about how to fix this?

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 01, 2016, 08:13:31 pm
content: The specs on Keysight's datasheet say: +13 dBm standard or max +23 dBm with option 1EA, so not sure where you got the +33 figure fromhttp://literature.cdn.keysight.com/litweb/pdf/5989-5311EN.pdf?id=843957It looks like option UNT is AM, FM and phase modulation, which is kind of weird because you'd expect that as a standard.

author: jrgandara
author_rank: Contributor
timestamp: November 01, 2016, 10:45:30 pm
content: My mistake. You are right, +23 dBm max.When getting the unit we do not even thought the possibility of not having AM/FM modulation. Very frustrating knowing the hardware is there, but crippled.
Euratele Resitor / Cap / Inductor box, but  how does it work? - Page 1
Forum section: electronics / testgear

author: onesixright
author_rank: Frequent Contributor
timestamp: November 06, 2016, 05:30:29 pm
content: Hi Guys,I guess for the bit older generationI got a Euratele Resitor / Capacitor / Inductor box, but im not sure how some of the connection are supposed to workMy question are about:1. the lower left (black, yellow, red)2. the lower right connections (green, black, yellow and red) it writesI.D.andG.D.3. and then there is the S/P switch (series / parallel) ?I found this website that has it listed (with circuit).http://www.radiomuseum.org/r/euratele_ersatzstromkreispruefer.htmlAny help much appreciated! Thanks!