hybridfree/eevblog-posts huggingface dataset:
Sencore LC101 Schematic needed - Page 1
Forum section: electronics / testgear

author: mskobier
author_rank: Regular Contributor
timestamp: June 12, 2015, 06:14:04 pm
content: All,I just pulled my Sencore LC101 down from the shelf to use today. I haven't needed to use it in a couple of years. Anyway, its dead!. I get a momentary display upon turning it on, then nothing. No display, no LEDs, nothing. I checked the fuse and it was good. Just a beginning guess, but its probably the power supply. Anyway, I need a schematic or better yet a service manual for it. Can anyone help me out, or no where I can find a copy of the schematic?ThanksMitch

author: lapm
author_rank: Frequent Contributor
timestamp: June 12, 2015, 06:15:42 pm
content: Maybe this is helpfull? First link on google search..http://exodus.poly.edu/~kurt/manuals/manuals/Other/SENCORE%20LC101%20Operation,%20Application%20&%20Maintenance.pdf

author: mskobier
author_rank: Regular Contributor
timestamp: June 12, 2015, 07:41:58 pm
content: lapm,Thanks for a copy of the manual. I had already located a manual. What I need is a copy of the schematic, and/or actual service manual if one exists. I do appreciate your effort to locate a copy of the manual though.Mitch

author: PaulAm
author_rank: Frequent Contributor
timestamp: June 12, 2015, 09:09:40 pm
content: It's hard finding Sencore schematics. You might try Sencore, or check with Artek. I got a schematic/service manual for a CR70 from them.

author: commongrounder
author_rank: Frequent Contributor
timestamp: June 12, 2015, 10:24:20 pm
content: Sencore has long been out of the test gear business, and manuals have mostly been depleted. There are sellers on ebay who have been consolidating sencore manuals on CD for a reasonable cost. Ironically, the problem with your cap analyzer is likely bad caps in the power supply.

author: mskobier
author_rank: Regular Contributor
timestamp: June 13, 2015, 02:57:02 am
content: commongrounder,I've noticed the sellers on -bay, but their listing is for the manual that is listed in this thread and I also found from other sources on the net. Unfortunately, none of these have the schematic included.I was thinking the same thing in regards to the power supply being the problem. I did check the voltages across the three electrolytics on the main board, and they did not seem to be much out of spec. That's based upon the voltage rating of the capacitor being about 50% higher than the voltage I was measuring across each of the capacitors. Unfortunately, I do not know what the voltages are supposed to be, so its just a guess. Hopefully someone will have a schematic I can get a copy of.Mitch
Oscilloscope chose question - Page 1
Forum section: electronics / testgear

author: vaualbus
author_rank: Frequent Contributor
timestamp: June 12, 2015, 07:37:52 pm
content: So recently I search on internet for a new scope that gonna replace my TDS540.I've found at some good price the TDS754D the TDS684C and the Lecroy LC574AD.Any guess what is the best of those?

author: nctnico
author_rank: Super Contributor
timestamp: June 12, 2015, 07:42:51 pm
content: Check whether the TDS684C and LC574 have peak detect. Also the TDS600 series generally has a very short memory; these are aimed at high speed real-time sampling so are more suitable for HF work than general purpose (remember these are from the 1990's).

author: vaualbus
author_rank: Frequent Contributor
timestamp: June 12, 2015, 07:50:16 pm
content: Ya infect the memory was the point.The TDS754D have If option 2 8M of memory like the LC one but the C I don't know.Also the TDS574D is a DPO and the other I think no.
Tektronix Input RC Normalizer 067-0537-00 data sheet/manual - Page 1
Forum section: electronics / testgear

author: mskobier
author_rank: Regular Contributor
timestamp: June 12, 2015, 03:44:15 am
content: All,I have a Tektronix Input RC Normalizer 067-0537-00 that I am trying to find the data sheet/manual for. I have searched the net extensively, and have not been able to find the paperwork for it. I want to check the calibration of it, then use it to set the input capacitance on my three Tektronix 2400 series scope. Tektronix made a number of different versions of these normalizers, with different capacitance ratings. The one I have is for a 1meg 15pf input. I would imagine the setup for any of these normalizers would give me the testing info I need. Any help would be greatly appreciated.Mitch

author: Bill158
author_rank: Regular Contributor
timestamp: June 12, 2015, 04:00:52 pm
content: Attached is a "pdf" of the Tek 067-0538-00 Input Normalizer manual. I hope this helps.Bill

author: mskobier
author_rank: Regular Contributor
timestamp: June 12, 2015, 04:12:02 pm
content: Bill,Thank you very much. The PDF should answer most of my questions.ThanksMitch
Function Generator TFG-3560 - Page 1
Forum section: electronics / testgear

author: Do1JSA
author_rank: Newbie
timestamp: June 12, 2015, 12:20:16 pm
content: Hi Friends,Does somebody own and operate a function generator TFG-3560 from Twintex?If yes it would be nice to have some conversation on experience and software.Regards, 73, Jürgen
ET 310 Scopemeter - Page 1
Forum section: electronics / testgear

author: daybyter
author_rank: Frequent Contributor
timestamp: June 05, 2015, 08:06:19 pm
content: Hi!Has anyone heard of this scopemeter yet?http://de.aliexpress.com/item/Ivan-10M-high-cost-ET310-ScopeMeter-oscilloscope-multimeter/1490465395.html?isOrigTitle=trueI cannot find any reviews yet.

author: daybyter
author_rank: Frequent Contributor
timestamp: June 09, 2015, 11:37:37 pm
content: Seems like there is also a color version with 50 MHz available:http://de.aliexpress.com/item/HOT-SALE-50M-Color-ScopeMeter-ET521S-cost-effective-ultra-100M-digital-oscilloscope/1408938453.html?isOrig=true#extend

author: pascal_sweden
author_rank: Super Contributor
timestamp: June 10, 2015, 07:37:40 pm
content: I posted a similar request back in May.Apparently the specs are not impressive at all. See details in my thread:https://www.eevblog.com/forum/testgear/et310a-handheld-10mhz-50mss-oscilloscope-true-rms-multimeter/msg668023/#msg668023

author: daybyter
author_rank: Frequent Contributor
timestamp: June 10, 2015, 08:31:08 pm
content: Well...the 521s has at least the BNC connector and comes with a probe (according to the pictures).It seems the 10 mV and the 6 MHz with the x1 probe are not too impressive but for the price...?
Rigol DS1074Z intermittent CH1? - Page 1
Forum section: electronics / testgear

author: tom66
author_rank: Super Contributor
timestamp: June 10, 2015, 06:18:43 pm
content: I've noticed recently that if I wiggle the BNC connector, CH1 signal varies (independent of the probe.) At one time, signal was 1/10th what it was. Works most of the time, but caught me out for a while doing some tests. I use CH1 most often on my scope...Must be an issue with solder or components around the BNC. The scope is still under warranty, but it'll be a hassle to send it back.Wondering if anyone else has encountered this issue?
Rigol DS2072 averaging progress indication? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: June 10, 2015, 06:31:35 am
content: Just playing with the scope on a dull winter's mid-afternoon. 1uS div, 500mv div, 14M point memory, 8192 averages. Looking at the rising edge of the probe cal signal. After several seconds the horizontal part of the trace settles down to a very clear, noise-free, narrow line. After maybe 30 minutes of this while I fell into a time warp reading EEVblog forum stuff I looked over and the scope trace now had a bit of noise on it. It was like some sample counter in the scope had rolled over and now it had quit averaging.What would be good is if there was some kind of progress indicator showing what percentage of the average count had accumulated. Used to use an old HP scope that had this feature as a small bar graph.Edit -> did it again just after I posted. Took maybe 10 minutes.
Tek  2445b Auto Setup Message - Page 1
Forum section: electronics / testgear

author: j ferguson
author_rank: Contributor
timestamp: June 08, 2015, 04:09:55 pm
content: My new-to-me 2445B shows "small or low rep rate signal" when the auto setup button is pushed and when channel one is connected to an Elecraft SG-1 signal source producing 7.490 mHz 50 uV signal. It doesn't go on to display anything, but I can bring up the signal with some knob twisting and button pushing, and then it displays the signal just fine.Same thing with a 1 mHz 2 volt signal.Any Ideas? Or have I assumed something I shouldn't have?

author: monz
author_rank: Contributor
timestamp: June 10, 2015, 03:21:34 am
content: WBCQ fan? The lowest range is 2mV/div (20mV/div with 10x) probe. 50uV is 0.05mV, so it probably is going to be too low lock on to or even really see (2.5% of a division high at 2mv/div). 2V should be no trouble, so there could be a problem, verify it displays that and triggers on it manually. In practice auto setup really isn't too useful or even used much.

author: miguelvp
author_rank: Super Contributor
timestamp: June 10, 2015, 03:49:27 am
content: What coupling are you using? maybe it's set into low frequency reject.Also is the holdoff set to minimum?A/B trigger mode button pushed?And I have no idea what Auto LVL is but it seems it has both an Auto and an Auto LVL for the trigger mode.Source set to Vert or the channel you are probing?Does it do the same thing on the other 3 channels?Edit: and by not displaying anything you mean like if it was set to norm and not triggered so you get nothing at all on the screen? or do you still see the sweep?
Great multimeter score, rebranded Brymen 859 ? - Page 1
Forum section: electronics / testgear

author: Grapsus
author_rank: Regular Contributor
timestamp: June 12, 2015, 01:05:14 pm
content: Hi !After seeing a lot of people here getting stuff like keithley 2000 for 30$ dollars on ebay again and again I finally got luckyLook at what I got from local ads.There is a damaged Fluke 185 for which I'll open a separate restoration thread.Most importantly, there are three unknown multimeters which are labeled "Fi919Xa". I took them because they look a lot like Brymen 859, do you think they are the same with just the brand changed ? Is this a frequent practice for Brymen ?I'll post a teardown tonight to investigate further.

author: EEVblog
author_rank: Unknown
timestamp: June 12, 2015, 01:10:31 pm
content: Quote from: Grapsus on June 12, 2015, 01:05:14 pmYes. That meter has been sold under many different brands for a long time.

author: retiredcaps
author_rank: Super Contributor
timestamp: June 12, 2015, 09:08:23 pm
content: Quote from: Grapsus on June 12, 2015, 01:05:14 pmYes, Brymen is resold under many brand names. Here is a recent example of a Brymen pawn shop score.https://www.eevblog.com/forum/testgear/pawnshop-score-amprobe-am-91-'yellow'-rubber-case/You didn't state how much you paid for all 4 meters. Without that information, we can't judge if you scored or not!

author: Grapsus
author_rank: Regular Contributor
timestamp: June 13, 2015, 09:45:13 am
content: Here are the pictures of the inside of one meter. Definitely a Brymen 859. I'm impressed with the build quality, it's the closest to Fluke I've ever seen.Quote from: retiredcaps on June 12, 2015, 09:08:23 pmFair enough, I paid 200 euros for the four meters and three sets of TL175 probes.
Almost famous scope CAM - Page 1
Forum section: electronics / testgear

author: wd5gnr
author_rank: Regular Contributor
timestamp: June 11, 2015, 03:13:14 pm
content: What do most people want from a Web Cam? A view of Paris? A pretty girl (or handsome guy)? Scenic vistas? Not you! You are an ENGINEER! You want to know: "What's Al's scope looking at right now?"You will never have to wonder again!http://www.awce.com/scopecam.htm

author: blackbird
author_rank: Regular Contributor
timestamp: June 11, 2015, 09:05:56 pm
content: My first reaction was 'Why?' but the site already answers this question

author: pascal_sweden
author_rank: Super Contributor
timestamp: June 11, 2015, 09:13:24 pm
content: Why are all bananas bent? Because they are

author: wd5gnr
author_rank: Regular Contributor
timestamp: June 12, 2015, 02:28:05 am
content: If you have to ask why....

author: miguelvp
author_rank: Super Contributor
timestamp: June 12, 2015, 02:55:49 am
content: I looked at the link 4 times today, and they all were OD on triggerBtw, DrDobbs, nice!Used to get the free subscription way back then.

author: wd5gnr
author_rank: Regular Contributor
timestamp: June 12, 2015, 02:59:56 am
content: Well it changes to 0C sometimes, but the duty cycle of channel 2 is pretty variable.For some reason I occasionally hang up and then the updates stop until I rekick it. Got to figure out why that is.As for DDJ I was very sad to see it fold. I had read it nearly from the start and wrote for them since 1989 all the way to the end. I produced special issues, ran a section of one of her sister magazines (the long gone Web Techniques) and it broke my heart to see the old girl go.
swarm of Bees .......fluke 123 - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 09, 2015, 05:20:12 pm
content: Is there anyone in this forum who is able explain this phenomenon ...The fluke 123, 124 ,125 scopemeter even though very old and many with defects still command a very good price on ebay. They hold there weight in gold much better than the tekscope.I'm just interested as to why this is the case see the link below 50 bids on a fluke 123 final price nearly approaching 331 euros.http://www.ebay.co.uk/itm/151699896961?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AITBe interesting to have your views on this.R_G_B

author: Muxr
author_rank: Super Contributor
timestamp: June 09, 2015, 06:18:32 pm
content: I think it's because of the automotive use. Mechanics who need a scope may have not heard of Tek, but everyone knows and trusts Fluke.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 09, 2015, 06:58:59 pm
content: Quote from: Muxr on June 09, 2015, 06:18:32 pmYes you may have a valid point.I had no problem selling a very worn out fluke 123 with lines down the screen. Same can not be said about the tek scope I tried to sell. Nobody seemed interested.This was the reason I asked this question.I also think the fluke 123 form factor may have something to do with it. It has a nice trend plot feature and dual multi meter function as well.Thanks MuxrR_G_B
DS1000Z - yet another issue(?) - edit: No :) - Page 1
Forum section: electronics / testgear

author: nrxnrx
author_rank: Unknown
timestamp: June 08, 2015, 04:58:10 pm
content: Hi everyone!I found this video which seems to show a DS1074Z locking up: "rigol DS1074Z system halted DS1000Z".Unfortunately, it's only the second most spoken language on the planet, and I don't speak it. Can anybody please tell me/us what he did to get it to lock up?The video is from 2013, and there are comments from "1 year ago" confirming whatever the problem is.-----Got home, plugged the primary brain back in and thought of google translate:the youtube description:"To do: Press REF button once (on REF function)Press CH1 button twice (off CH1 channel), press REF key once (Off REF function), then all key failure, crash.Rule is: after opening REF, close the channel has been opened, then closed REF That crash."Can't reproduce. 4.02SP4, board 0.1.1 .--MihaiPS: I was afraid we'd get a day without a rigol DS105400Z on the front page. Danger averted.

author: mauroh
author_rank: Frequent Contributor
timestamp: June 08, 2015, 05:25:29 pm
content: Not specifying all the settings, firmware/hardware version is not very easy to reproduce.I have a DS1074z hacked to DS1104zBoard ver 0.0.1Firmware 00.04.02.SP4And following the steps on the video I wasn't able to reproduce the issueTried also with the Chinese languageMauro

author: rf-loop
author_rank: Super Contributor
timestamp: June 08, 2015, 06:46:15 pm
content: Quote from: nrxnrx on June 08, 2015, 04:58:10 pmLanguage Approx. number of speakers1. Chinese 1,197,000,0002. Spanish 414,000,0003. English 335,000,000Sidenote: can not reproduce with DS1074Z

author: gmb42
author_rank: Frequent Contributor
timestamp: June 08, 2015, 07:26:04 pm
content: Quote from: rf-loop on June 08, 2015, 06:46:15 pmNote that those numbers are native speakers of their respective languages. When you add in folks speaking English as a second language ~500 million and as a foreign language, ~750 million, the total is ~1500 million. Source:Wikipedia listing languages by total number of speakers.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: June 08, 2015, 07:28:23 pm
content: Nope, can't reproduce this one on my "buggy" DS1054Z according to the directions above. I loaded the Default setup (Storage>Default) before starting.Firmware 04.03, board 0.1.1
HP 3457A DMM question - Page 1
Forum section: electronics / testgear

author: mojoe
author_rank: Frequent Contributor
timestamp: June 16, 2015, 02:44:10 am
content: Using an EDC 330 DC voltage standard, I was checking my HP3457A. The full scale DC ranges on the 3457A are 30 mV, 300 mV, 3 V, 30 V and 300 V. I set the EDC 330 for a full scale value for each range. These are the readings I got on the 3457A.29.99336 mV(30 - 29.99336) / 30 = .00022% error = 2.2 ppm299.9348 mV(300 - 299.9348) / 300 = .00022% error = 2.2 ppm2.999443 V(3 - 2.999443) / 3 = .00019% error = 1.9 ppm29.99526 V(30 - 29.99526) / 30 = .00016% error = 1.6 ppm299.9384 V(300 - 299.9384) / 300 = .00021% error = 2.1 ppmI set NPLC = 100 and DIGITS DISP = 7. I then waited until I got a stable reading. When the LSD was changing, I took the worst case value.OK, this should be very simple math, so please tell me if I did something incredibly stupid. If these numbers are correct, then both the voltage standard and the DMM are more than ten times better than spec. This seems too good to be true.

author: cncjerry
author_rank: Unknown
timestamp: June 16, 2015, 04:36:19 am
content: yes, your percentages are off by a factor of 100.(30 - 29.99336) / 30 = .00022Percent would be .00022 x 100 or .022%If your meter is anything like my two then your standard is slightly off or your meter isn't calibrated. Did you run autocal before testing?

author: VintageNut
author_rank: Frequent Contributor
timestamp: June 16, 2015, 10:14:57 am
content: 220 ppm, not 2.2 ppm. You should only use one range on your DMM, the most linear range. There will be an offset between ranges.
Is the Tekpower TP40 6000 better than the TP2844R? - Page 1
Forum section: electronics / testgear

author: Ronshere
author_rank: Newbie
timestamp: June 08, 2015, 04:49:48 pm
content: I have been looking for a meter in this price range that is true RMS and I noticed that the TP40 6000 has some different features from other meters, mainly the Relative Measurement and NCV features. I was wondering if these are handy to have or just glitz?Or is there some other meter in this price range that is just better all around? I would appreciate suggestions.The TP40 is going for $39.99 + $6.88 shipping on Amazon.In general, do you consider Tekpower meters to be fairly accurate and reliable?Do you think the TP40 would be better than the Digitek DT-2843R?
National (Matsushita) Voltmeter VP-9630A - Page 1
Forum section: electronics / testgear

author: py2mta
author_rank: Newbie
timestamp: June 07, 2015, 06:51:28 pm
content: Does any one have a copy of National (Matsushita) Voltmeter VP-9630A user manual and schematics?Or know where it is available in WEB?I have one that is working fine and I was able to calibrate it, but I would like to have these docs with me.Marco Tulio
Looking for 8 channel (USB) DAC interface.. - Page 1
Forum section: electronics / testgear

author: nctnico
author_rank: Super Contributor
timestamp: June 06, 2015, 11:32:14 pm
content: For a long time I have been looking for a digital pattern generator solution for a reasonable price and small form factor. I decided to go a different route and for that I will be needing a multi channel DAC interface which also has an output enable for each individual channel. I don't need speed or many bits (as long as it can create various logic levels). I'm wondering if there is a readily made (preferably) USB DAC interface which could be used for this purpose.

author: miguelvp
author_rank: Super Contributor
timestamp: June 07, 2015, 12:04:06 am
content: Edit: (oops just saw the multi channel requirement, the CY7C65211 is single channel so you'll need a CY7C65215 and two of those MCP4725 DAC boards)Maybe an I2C module like this one? (Adafruit MCP4725 DAC)up to 200KHz Vout update and 3.3V or 5Vhttp://www.adafruit.com/products/935I'm using a USB-UART chip from cypress that supports I2C (on top of SPI and UART) that I got from the break out board from a 4100 prototype board, but there might be other boards that will do a USB to I2C bridgeMore info here (with code running on my PC to control the DAC):https://www.eevblog.com/forum/microcontrollers/mcp4726-12-bit-i2c-dac-driver-for-esp8266-modules/More info on the USB-UART I used (CY7C65211-24LTXI):https://www.eevblog.com/forum/microcontrollers/cheap-easy-i2c-dev-kit/msg618200/#msg618200Prototype board ($4) where I got the USB-UART from:http://www.cypress.com/?rID=92146doesn't matter if you get the 4200 or the 4100. Then again there are probably other chips that can do this.

author: miguelvp
author_rank: Super Contributor
timestamp: June 07, 2015, 03:18:08 am
content: Took a nap so at least now I might be more coherent.A single channel USB-UART will do the trick since it's just the I2C master.It is possible to do it with the MCP4725 chip but it will require 8 chips and some special ordered since the 2 higher address bits are configured during manufacturing but 8 chips even this small will probably break your requirements. If you can make them fit you'll need:2 of MCP4725A0T-E/CH2 of MCP4725A1T-E/CH2 of MCP4725A2T-E/CH2 of MCP4725A3T-E/CHAnd wire the A0 pin on each accordingly to make each one a different slave address.I guess what I want to say is that you can find a I2C or SPI chips that will meet your requirement and use a CY7C65211 to drive themFor example, one of these:http://www.analog.com/parametricsearch/en/10545#10545/p4656=8|8

author: nctnico
author_rank: Super Contributor
timestamp: June 07, 2015, 01:42:18 pm
content: That still seems like a lot of tinkering. I'm starting to lean towards slapping something together... Most of the work is in the software to generate patterns in an easy way anyway.
Rigol DS1052E power cycles report screen - Page 1
Forum section: electronics / testgear

author: Neuromodulator
author_rank: Regular Contributor
timestamp: June 07, 2015, 01:32:01 pm
content: Hello,Some time ago I found by coincidence a report of power cycles and I believe also of hours of usage of my Rigol DS1052E. The way to access this report screen is not mentioned in the manual and I couldn't google it either. I believe I pressed some button combination after some screen (maybe system information), but I just cant get to it now...Does anybody know how to access this report screen?Thanks in advance...

author: saturation
author_rank: Super Contributor
timestamp: June 07, 2015, 02:10:10 pm
content: http://www.instructables.com/id/Hacking-the-Rigol-DS1052E-Oscilloscope-with-Linux/step4/Find-your-firmware-version/
Uses of a thermal camera in hobby electronics ? - Page 1
Forum section: electronics / testgear

author: Franz Zinn
author_rank: Contributor
timestamp: June 05, 2015, 07:25:57 pm
content: Hi,What are the typical design/diagnostic uses of a thermal camera. If it is just a matter of checking if some component is over heating, isn't this more inexpensively done using a multimeter and thermal probe ? How useful is it as a tool ?regards

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 05, 2015, 07:49:18 pm
content: Possibly more useful for debug & repair than design - if all you care about is the temp of a single point then yes an IR thermometer is adequate.A TIC is Extremely good at finding shorts on a PCB - throw some current into it and the path of the short just lights up.Similarly if excess current is being drawn by a component, you can see it instantly.Other applications would include measuring the effectivness of heatsinking as you can see the thermal gradients.Can also be useful for monitoring temp while doing hot-air rework.It's also just a fun toy to have

author: georges80
author_rank: Frequent Contributor
timestamp: June 05, 2015, 08:28:20 pm
content: It's very useful to find components that are somewhat 'damaged'.I've used mine to debug faulty/damaged capacitors. Leaky FETs in switchers.It's incredibly useful to verify the thermal path of a design, especially using high powered FETs that rely on vias in the thermal pads to transfer heat. You can see the entire board as it heats up and how heat transfers through various thermal paths including the heatsink/housing.A single point IR gun or thermocouple can't provide that level of 'detail'.Obviously if your designs don't need that level of observability then the TIC is just an expensive toycheers,george.
Fluke 45 DMM - RF interference - Page 1
Forum section: electronics / testgear

author: dramoto
author_rank: Contributor
timestamp: June 05, 2015, 05:10:47 pm
content: Nothing wrong or to fix (I think). Just something that surprise me.I put a VHF aerial band receiver next to the fluke by chance. Then I surprised that the fluke radiomagnetic noise it´s enough to opens the squel limit of the receiver. And it´s perfectly audible the noise at every measurement refresh.I´m not sure if it´s better or not to know about radiomagnetic contamination...

author: commongrounder
author_rank: Frequent Contributor
timestamp: June 05, 2015, 07:03:10 pm
content: Yes. I have two of them in my shop, and experience the same thing. There isn't much shielding on either the display or microprocessor clocks. I can easily pick up noise from them with just a loop on my 'scope probe. I have learned to shut them off (as well as any other unnecessary equipment) when making sensitive measurements.
uCurrent & oscilloscope - Page 1
Forum section: electronics / testgear

author: rlogiacco
author_rank: Contributor
timestamp: June 05, 2015, 09:34:37 am
content: Is it possible to use the uCurrent in place of a shunt resistor with an oscilloscope to measure current / time?How reliable would that be in terms of response time?In my dumbness I'm currently considering the uCurrent an alternative to 3 precision shunt resistors, but I understand the active amplification part might introduce some limits in terms of response time...

author: leppie
author_rank: Frequent Contributor
timestamp: June 05, 2015, 10:34:40 am
content: Yes, you can, just make sure the DUT is floating. On the low-end of uA range (~5uA) it was quite noisy on the scope though. It does average out to the same values I get on my meter, and using integration seems to be quite accurate too, even in the presence of noise.

author: Muxr
author_rank: Super Contributor
timestamp: June 05, 2015, 05:07:44 pm
content: What leppie said. Also there is a relevant video which covers it as well:
Agilent 1147B current probe, does it work on 7000 series scope? - Page 1
Forum section: electronics / testgear

author: HighVoltage
author_rank: Super Contributor
timestamp: June 05, 2015, 11:17:31 am
content: I was offered an Agilent 1147B current probe for a good price. But it is listed for the high end 80000/90000 series Agilent scopes.The connector looks like it will fit the 7000 series scope perfectlyBut my question is, will it work on a 7000 series scope or will I get an error message claiming incompatibility?Thanks to anyone who has experience with this probe and can comment on it.----------------------Keysight discription:Key Features & SpecificationsWide bandwidth: DC to 50MHzHigh S/N ratio, low current measurement capability15A peak, 15 ADC, 10 Arms continuous, 30A peak non-continuousEasy protect function at excessive inputDemagnetizing switch to remove any residual magnetism that builds up in the magnetic coreCompatible with high impedance AutoProbe interfaceFor use with 80000/90000 Series, use N278xA current probe with N2779A power supply and E2697A high impedance adapterFor use with 90000 X-Series, use the N5449A high impedance probe adapter------------------

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: June 05, 2015, 11:36:48 am
content: Quote from: HighVoltage on June 05, 2015, 11:17:31 amIf I remember right (might be wrong, though), the 1147B only works with the DSO9k/80k/90k Series only.I could verify that at work if we had a DSO7k, which we no longer do.

author: HighVoltage
author_rank: Super Contributor
timestamp: June 05, 2015, 12:49:46 pm
content: Thanks for your reply Wuerstchenhund,I found a great Agilent PDFIt looks like the 1147B will fit the 3000-X, 4000-X, 6000-X, 9000 Series, S-Series, 90000 SeriesInterestingly, that the 7000 Series is not listed.

author: MarkL
author_rank: Unknown
timestamp: June 05, 2015, 02:14:37 pm
content: The 1147B is listed here:http://literature.cdn.keysight.com/litweb/pdf/5989-6162EN.pdfand here:http://literature.cdn.keysight.com/litweb/pdf/5968-8153EN.pdfas compatible with the 7000 series.
Flir I3 - Page 1
Forum section: electronics / testgear

author: shipships
author_rank: Newbie
timestamp: June 04, 2015, 10:10:39 am
content: HI All,I have a Flir I3 which im trying to mod to I7 and cant connect using RNDIS with Total Commander App. Any assistance?

author: OrBy
author_rank: Regular Contributor
timestamp: June 04, 2015, 01:13:30 pm
content: Most of the instructions that are out there can be found below.http://lmgtfy.com/?q=site%3Ahttp%3A%2F%2Fwww.eevblog.com%2Fforum%2Ftestgear%2Fflir-e4-thermal-imaging-camera-teardown%2F+i3But I have found that using old XP PC's works better then new win7 or win 8 PC's for RNDIS issues. I keep a WinXP VM around just for that reason.

author: shipships
author_rank: Newbie
timestamp: June 04, 2015, 02:17:41 pm
content: Thanks. Will try on my old laptop.Do you know if I updated the firmware to 6.5.1 before I did the mod, would it still work?

author: OrBy
author_rank: Regular Contributor
timestamp: June 04, 2015, 07:59:38 pm
content: Quote from: shipships on June 04, 2015, 02:17:41 pmNo idea - Use Google to search the main E4 thread since much of that was discussed there.
DCP3010A high precision adjustable linear DC power supply 30V10A - Page 1
Forum section: electronics / testgear

author: kzgkiyn
author_rank: Newbie
timestamp: June 05, 2015, 06:43:16 am
content: Have you used the WeChat, can join the public platform, have a more detailed test

author: HighVoltage
author_rank: Super Contributor
timestamp: June 05, 2015, 09:30:18 am
content: Is this something you built and you are selling as a kit?
Smith chart with SA44B/TG44A - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: June 04, 2015, 07:40:41 pm
content: Evnin'...My Signalhound arrived this week and I'm currently thinking to get the tracking generator TG44A as well to get a network analyzer..In an application note form Signalhound I saw that there is a feature called "smith chart" in their Spike software....What actually is this tool useful for?Can I use this with an injector to adjust an antenna design for a specific frequency?

author: hendorog
author_rank: Super Contributor
timestamp: June 04, 2015, 08:50:57 pm
content: I have the SA124B + TG124A combo - which is basically the same as the SA44 series, apart from the extended frequency range.The Spike software is quite new rewrite and doesn't have the Smith Chart feature (yet?)That feature is in the older software which can still be downloaded and used on the same PC as Spike.The other thing to note - in these devices the Smith chart feature works with a single frequency at a time. It doesn't sweep. This means a calibration is required for each frequency if you need to make measurements at many frequencies.This isn't such a big problem for tuning antennas. You can sweep the return loss using the Spike software and a directional coupler. The Spike software works extremely well for this and is much faster than the old software.Then make single frequency measurements and adjustments using the older software and the Smith Chart.

author: davorin
author_rank: Unknown
timestamp: June 05, 2015, 11:07:33 pm
content: What sort of device is this directional coupler they are selling as well?What is this small metal box doing for US$ 110? Or is this simple to be built selfmade?

author: tggzzz
author_rank: Super Contributor
timestamp: June 05, 2015, 11:49:52 pm
content: Quote from: davorin on June 04, 2015, 07:40:41 pmYou can find good explations here: lmgtfy.com/?q=smith+chart+antenna
Cheap kit project ESR Capacitance and transistor tester based on Atmega328p - Page 1
Forum section: electronics / testgear

author: Doc38343
author_rank: Contributor
timestamp: June 04, 2015, 08:37:28 pm
content: This just came in today and I couldn't wait to get started so the first pic is partially assembled. This was a $13.95 ebay kit from somewhere in China. It appears to be an actual Atmega328p by looking but that doesn't mean much these days. Kit was well packaged in a good silver static bag. The Atmega328p is legs embedded in anti static foam and the package was inside a small box with a foam case around it. (much better than most).All the parts were also there which is always a good thing. On a side note what kind of sadist puts a 330ohm 4 band blue body .25 watt resistor right beside a 3k3 blue body? don't they know that past a certain age (over 50) those tiny rings look same colored??Just saying I much prefer the lighter bodied resistors.... AND YES I do thru-hole ALL I CAN!!!!Later for a update after I find a freaken bigger magnifier!!!

author: Deathwish
author_rank: Unknown
timestamp: June 04, 2015, 08:40:46 pm
content: I couldn't agree more about those infernal blue bodied Resistors !. Much prefer the beige coloured ones.

author: MLXXXp
author_rank: Frequent Contributor
timestamp: June 04, 2015, 08:45:31 pm
content: It's likely based on this design, if you're looking for more information:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/

author: Doc38343
author_rank: Contributor
timestamp: June 04, 2015, 09:25:08 pm
content: Quote from: MLXXXp on June 04, 2015, 08:45:31 pmNice!One thing sure,, mine will not be that nice either!

author: Doc38343
author_rank: Contributor
timestamp: June 05, 2015, 12:54:10 am
content: Update.. kit assembled and tested. not sure i got the calibration right. I didn't get any instruct and the screen prompt was a bit hard to follow but seems close enough. It zeroed out the test leads by reading their resistance first so I think it will be ok for my purpose. Certainly better than the ESR meter I made first from scratch but hey it's all in the learning.It detected a PNP transistor spot on and even revealed the pinout, which was nice I thought. I have a few to test!A few build pics follow...

author: Doc38343
author_rank: Contributor
timestamp: June 05, 2015, 01:00:23 am
content: Here are some actual tests after I tried to get it calibrated. I will do it again later and try and find some info, i guess that's part of the "cheap".Hey for 13.95 with free shipping I'm not complaining and it will come in handy for me.Test Pics follow:....Seems off on the lower value 10uF but I need to put the Fluke on that cap to see.
Fluke 28ii battery door cracks. - Page 1
Forum section: electronics / testgear

author: GCorrigal
author_rank: Newbie
timestamp: June 07, 2015, 04:19:47 pm
content: Has anyone had a problem with small cracks around the screw holes on the battery cover? I am aware of the 6 inch pound torque rating. Had an issue so fluke send me a whole new backing assembly. I removed the battery door with a hand screwdriver and noticed cracks starting on the new one. Any advice on resolving this issue would be appreciated.

author: saturation
author_rank: Super Contributor
timestamp: June 08, 2015, 01:59:37 pm
content: Picture please. It should be covered by Fluke's warranty.

author: LabSpokane
author_rank: Super Contributor
timestamp: June 08, 2015, 03:11:17 pm
content: Post a picture if possible. It could be the weld lines that you're seeing split. Every hole molded in a piece of plastic has a weld line where the plastic goes around the metal that makes the hole and comes back together.

author: GCorrigal
author_rank: Newbie
timestamp: June 09, 2015, 12:48:10 am
content: Sorry about no Pics. I will post some when my new battery door arrives. They are most definitely cracks though. Fluke is been really good to deal with as I bought the meter second hand so technically no warranty. I think the backing assembly they sent me was slightly used but they did not charge me for it. Looks like they are going to send me a new one though. Hope to resolve this issue as i love this meter.
Odd results when probing mains - Page 1
Forum section: electronics / testgear

author: jeroen79
author_rank: Frequent Contributor
timestamp: June 04, 2015, 12:51:47 am
content: I was poking around in a mains outlet with my multimeter and noticed something odd.I connected just one cable (bananaplugs on each end) between the meter and the outlet.The remaining sockets were empty.I varied which connections were made:Common and Volt on the meter.Left (neutral) and right (phase) hole on the outlet.I also varied where I put my hands:Meter standing free and holding meter at the bottom.Wire hanging free from outlet and holding wire near outlet.Meter: Fluke 179Mode: VAC, autorangeCable: 1 meterMains: 230 VACThe results:Meter free, probe free:LRV1.584.70C.125.360Holding meter, probe free:LRV4.1113.2C.3391.10Meter free, holding probe:LRV1.564.65C.122.354Holding meter, holding probe:LRV3.8613.0C.3101.10Some things I noticed:The phase socket gives a higher reading than the neutral.This is understandable to me as neutral is tied to earth potential.The common socket on the meter gives lower readings than the Voltage socket.Why is this?Is this related to how the DAC and input sockets are connected through a voltage divider?Holding the meter gives higher reading than a free standing meter.Why is this?Am I providing a capacitive coupling to earth with my hand and body?Or am I coupling the input sockets to eachother?Holding the probe does nothing.Why not?

author: Fungus
author_rank: Super Contributor
timestamp: June 04, 2015, 08:20:14 am
content: Quote from: jeroen79 on June 04, 2015, 12:51:47 amQuote from: jeroen79 on June 04, 2015, 12:51:47 amYes.Everything you're seeing is due to capacitance.
DSO probes for a LeCroy 9354AL - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: June 03, 2015, 04:31:14 pm
content: Evenin' (o;Around 10 years ago I bought a used LeCroy 9354AL 4 channel DSO which does still a fantastic job after all this years....maybe also the fact that I like the amber screen which gives a retro feeling ;-)Recently I bought on Ebay some cheap chinese 500MHz probes....but of course turned out that they are closer to 50MHz than 50MHz...Which probes would you recommend for the 9354AL which would not dig a too deep hole into my wallet?cheersrichard

author: marshallh
author_rank: Unknown
timestamp: June 03, 2015, 05:06:32 pm
content: PP006 and PP006A probes on ebay available for under $100 each. That is pretty cheap

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: June 03, 2015, 05:13:32 pm
content: I agree with marshallh, get some LeCroy probes. Aside from the common PP006(A) you can sometimes also get PP007 for pretty little money.As an alternative I would recommend Testec. Good quality at decent prices.I tried cheap probes before but essentially gave up on them, and now rather buy used brand name probes than new China probes.

author: davorin
author_rank: Unknown
timestamp: June 03, 2015, 06:40:56 pm
content: I saw those PP006(A) probes on Ebay....not expensive...but pretty much all of them are missing the hook you can plug on onto the tip...Have to look if I have a similar probe already and if the hook tips are compatible....
Four DMMs and the Megohm range: Question - Page 1
Forum section: electronics / testgear

author: xrunner
author_rank: Super Contributor
timestamp: June 03, 2015, 09:23:43 pm
content: Hey guys and gals, have a question I need help understanding.I got a replacement anti-static strap the other day and I wanted to do a quick check, so I switched on my HP 3435A and took a measurement from the wrist snap (not the fabric the metal part) to the opposite end. It read in the Megohm range as it should have, however it was a fluctuating reading, going between 1.056 M to 1.064 M and values in between all the while it is connected. Hmmm. I thought maybe the instrument had a flaw, so I then tried my HP 3466A, and it read a solid (non-varying) 1.061 M ohms. I then decided yes, the other HP wasn't working right, because the reading was fluctuating on a device that should be static.I did some tests with lower value resistors, and I really didn't see any fluctuating. Other than some weird internal quirk, I didn't have a solution at the time.Then I decided to try another one of my meters - an older Tek DMM157. To my surprise, it also fluctuated, almost exactly the same as the HP 3435A. It went from 1.049 to 1.066 and values in between. Interesting.Then I tried yet another meter, a newer little UNI-T 136C. It read asolid1.058 Meg Ohms.No fluctuating.I have repeated these measurements several times and all the meters act the same every time. The HP 3466A & UNI-T 136C have solid resistance readings from the strap, and the HP 3435A & Tek DMM157 have fluctuating readings from the strap.What's going on here? Can this be explained in terms of different types of resistance input circuits? Since I can find no other problems at all with the meters, I assume that must be where the explanation lies.Picture for reference

author: sync
author_rank: Frequent Contributor
timestamp: June 03, 2015, 09:50:58 pm
content: Try shielded cables or connect the resistor as short as possible to the DMM input. Then you can see if the fluctuation is caused by the meter itself or by your test leads acting as antenna.The 3435A uses 500nA and the 3466A uses 1uA on the 2MOhm range. Also the 3435A has poorer normal and common mode rejection. So it's more sensitive to external noise.

author: xrunner
author_rank: Super Contributor
timestamp: June 03, 2015, 10:00:17 pm
content: Quote from: sync on June 03, 2015, 09:50:58 pmThanks, yea I just thought of another test along the lines of noise, as you said. When I was testing them, the banana end of the strap is plugged into a ground on my scope. I'm not goingthroughthe ground system to the meters, but one end is connected to it; thus, as you stated, itmayis acting as a source of 60 Hz noise. So now I expect the cause is the different meter designs and susceptibility to noise.I will get back with further results. I am going to use a 1 Mohm resistor first as a resistance test stand-alone, then having one end connected to the ground system
Keithley 225 owners - help wanted in repair thread - Page 1
Forum section: electronics / testgear

author: motocoder
author_rank: Unknown
timestamp: June 03, 2015, 07:18:47 pm
content: I started a thread over in the Repair forum, on my attempts to repair a badly damaged Keithley 225 precision current source. I know several of the folks here, including Dave, own one of these, but so far I've received a grand total of zero help on my questions.In case folks have something to offer there, here is the thread:https://www.eevblog.com/forum/repair/keithley-225-(current-source)-repair/Thanks
conformal coating peircing probes - Page 1
Forum section: electronics / testgear

author: srscricket
author_rank: Newbie
timestamp: June 03, 2015, 03:22:22 pm
content: Hey guys,At my job we use a conformal coating called huniseal, which I often need to get under to measure voltages and the like. A lot of people at my work basically solder razorblades unto the end of the probe making them quite large and difficult to work with. I was wondering if you guys knew of the best probes, without modification, that will poke through the coating. Right now I am just using regular fluke probes which mostly work well but require a lot of force to get through.Thanks for your time,Srscricket

author: djQUAN
author_rank: Frequent Contributor
timestamp: June 03, 2015, 03:46:44 pm
content: I bought the Fluke TL80A probe kit for my 115. It includes a pair of alligator clips and stainless needle extensions.The extensions are pretty sharp and I think it can pierce conformal coatings easily.http://www.amazon.com/Fluke-TL80A-Basic-Electronic-Test/dp/B000NI49VA/ref=cm_cr_pr_product_top?ie=UTF8If you don't need a complete probe kit, I found this:http://www.amazon.com/Fluke-TP88-Rigid-Probe-Length/dp/B000VRFL10/ref=pd_sim_469_5?ie=UTF8&refRID=0TW3TFJ8NK8FG2DC79E2

author: Tomorokoshi
author_rank: Super Contributor
timestamp: June 03, 2015, 04:03:50 pm
content: A couple styles from Digi-Key for cracking through Humiseal 1B73:http://www.digikey.com/product-detail/en/6235/501-1246-ND/737585http://www.digikey.com/product-detail/en/6275/501-1248-ND/737642

author: andy2000
author_rank: Frequent Contributor
timestamp: June 03, 2015, 04:04:09 pm
content: These probes have needle sharp points that should work well. They also have a version without the safety shroud for older meters.http://shop.huntron.com/product.sc?productId=2&categoryId=2
found out lower price for 100MHz 2 Channel 1Gsa/s sample oscilloscope - Page 1
Forum section: electronics / testgear

author: limpid
author_rank: Contributor
timestamp: June 02, 2015, 09:02:20 pm
content: See this website:http://www.circuitspecialists.com/hantek-100mhz-digital-storage-oscilloscope-dso5102p.htmlToo cheap, only 279US dollar 100MHz 2 Channel 1Gsa/s sample rate Digital Storage

author: limpid
author_rank: Contributor
timestamp: June 03, 2015, 12:53:46 pm
content: What happen for Hantek?I think them 5000B is enough good, for this price, enough good on the current market.

author: artag
author_rank: Super Contributor
timestamp: June 03, 2015, 02:27:58 pm
content: It's the P version - this is the low-cost reduced memory model, You'll find it pretty cheap on ebay, too. The B version is better (though not perfect - it still suffers a selection of irritations common on these cheap scopes).
Fluke 87V Grey Holster (case) - Page 1
Forum section: electronics / testgear

author: zaoka
author_rank: Frequent Contributor
timestamp: June 01, 2015, 08:57:15 pm
content: Does anybody know where to get one new FLUKE C81G grey holster for Fluke 87?Thanks

author: retiredcaps
author_rank: Super Contributor
timestamp: June 02, 2015, 05:44:32 am
content: Send ebay seller "a-fluke" a PM and ask if he has one for sale?
Third Party Software for Rigol DSA815-TG and DS1054Z - Page 1
Forum section: electronics / testgear

author: jamessawle
author_rank: Newbie
timestamp: April 03, 2015, 10:44:12 pm
content: Does anyone know where I can find some third party software for the Rigol Kit? Basically looking for anything better than what they supply which is pretty useless.James

author: HighVoltage
author_rank: Super Contributor
timestamp: April 05, 2015, 11:45:47 am
content: Quote from: PeDre on April 04, 2015, 06:58:20 amThanks for a great screen capturing software for my Rigol DSA815

author: videobruce
author_rank: Frequent Contributor
timestamp: May 30, 2015, 12:00:22 pm
content: I was able to install the USB driver, but the .exe doesn't run under Windows even thou it's listed that it should. It's what I call a DOS program, a command window pops up for a split second, then closes.What's wrong??

author: donkey77
author_rank: Regular Contributor
timestamp: May 30, 2015, 06:27:52 pm
content: I found the latest version, 0.6.9, worked fine for me with Windows 7 but I didn't use the drivers as connected via lan instead of usb. I did find Norton didn't like it and automatically deleted it to start with and it needs to have they other two folders with the library and dll's below the exe.

author: donkey77
author_rank: Regular Contributor
timestamp: May 30, 2015, 06:29:10 pm
content: Must also say thank you to Peter. Great work and thanks for sharing. Danke.

author: videobruce
author_rank: Frequent Contributor
timestamp: May 31, 2015, 01:34:42 pm
content: I contacted the author. He responded and corrected the link with a update and added a screen shot of the unpacked software. All looks good, the executable now opens.