hybridfree/eevblog-posts huggingface dataset:
Need help building probes for Hickok 209A - Page 1
Forum section: electronics / testgear

author: Anson
author_rank: Regular Contributor
timestamp: November 06, 2013, 01:34:57 am
content: I need to build a set of probes for a Hickok 209A VTVM. The tricky one is the AC probe which houses a 6AL5 Vacuum Tube in it and uses it as a double diode to rectify the AC. I'll include the circuit for the probe. Things I know so far. The connector to the unit is an Amphenol 91 MC4M mic connector at least thats what I have read. It uses a 4 conductor shielded wire 48" long. The heater voltage for the 6AL5 is 6.3v and 0.3 amps. The probe is meant to handle 300 volts. The tube has a diameter of 3/4 inch but the socket of course will be slightly larger. I haven't found a suitable socket. It is a 7 pin miniature socket needs to be round obviously so that it can fit in a tube. I'll include a picture of an original probe.I also need to make a dc probe and the other two test leads. I just need to find probe bodies and tips. Anyone have a source for these?

author: Vgkid
author_rank: Super Contributor
timestamp: November 06, 2013, 02:26:29 am
content: Here is the sockethttp://www.oldradiosnstuff.com/4-cinch-ts102p01-shielded-7-pin-tube-socket-6au6-6c4-6ab4-6x4-6al5-etctubes can be found on ebay. To bad there arent much any specs on the tube, as you could make a diode replacement for it.

author: Anson
author_rank: Regular Contributor
timestamp: November 06, 2013, 02:39:38 am
content: Thanks for the link. I had thought about using diodes instead of a tube. Not sure if there would be any issues with that or not. Would cut down on the bulk of the probe and eliminate the need for a couple wires.

author: BrianBurns
author_rank: Newbie
timestamp: April 06, 2014, 06:12:17 pm
content: Hello Steve,There is a guy on ebay selling what seems to be a military version of the Hickok probe with a tube aboard. I'm not sure whether links are permitted here, but you can just search ebay for Hickok probe, or email me for the link.Cheers,BrianBurns

author: SeanB
author_rank: Super Contributor
timestamp: April 06, 2014, 06:43:06 pm
content: You could just replace the diodes with BAT41 diodes. Similar voltage rating and similar capacitance, and probably will work well enough as a drop in replacement. Leaving the heater wiring open on pin 3 should do no harm. Will enable you to do 100V peak, and more if you place 5 or so in series, but probably I would not probe more than 200V with it.Don't know how they get a 1200V rating for AC with that probe, as the valve is only rated for 300v max. It might be 1200V DC across the coupling capacitor, with 100 VAC peak only.
HP E4418B EPM  Powermeter - Battery change - Page 1
Forum section: electronics / testgear

author: bingo600
author_rank: Super Contributor
timestamp: April 06, 2014, 03:07:53 pm
content: I just got my first my first PowermeterA used HP E4418B EPM Series Powermeter , with a HP 8481A sensor.The meter is in a very nice condition , and have Opt1 (Battery Pack) installed.As i knew the sensors are easy to damage i asked a very RF knowledgeable and kind person named Dave if he had a pair of tips for testing it at the sellers place. (Dave is actually a friend of user KJDS).Dave ansvered many of my newbie questions regarding the powermeter, and he was kind enough to come up with the attached list of steps, to verify correct operation of the meter and sensor.Once again thank you Dave.I went to the seller ,a kind radioham in Denmark. And when i came the meter had already been powered/warmed up.We verified the meter and sensor, and all went ok.But when i came home i was greeted with the following PON selftest message: Ram Battery FailedThe meter went on to normal operation , but still showed : ERR Power-up H/W Err (Pict 33)I found out it couldn't pass "Confidence test" due to having lost the sensors Cal-data , so i had to recalibrate the sensor.That's not difficult , but a bit annoying.But besides that , the meter functioned fine.Continues ...

author: bingo600
author_rank: Super Contributor
timestamp: April 06, 2014, 04:47:19 pm
content: Well i still hadn't seen the bugger inside , and a battery change would be a nice way to learn the beast to know.I had downloaded the service manual , and found the HP-PN for the battery BT1QuoteThat was great news , it's the same battery as i used for my 3478 DMM. And i had one in the drawer.Pict 16,23,24 is the old battery still in the meter.I fought quite a bit getting the old battery out , as the service manual mentioned that it had been fastened with silicone.They mentioned that one might need a Scalpel to cut it free , but i as i was to lazy to dismantle the whole box. To get the A10 (CPU) board out. I decided to change it with the PCB still in the box.I used a manual vaccumpump ,and sucked the holes as empty as i could. But i still couldn't get the battery free.I then decided to break away the soldertabs from the battery. That was quite easy , just using a little screwdriver to break the weldings. Now i could get the battery free , well actually the bottom plastic and silicone stayed on the PCB.I'd use a scalpel next time i encounter a silicone glued battery of this type. And cut a thin line in the plastic.Now it looks quite abused - See Pict 35,36,67.As i read HP recommends a battery change every 3 years,i decided to solder another type of the same battery in.I had one in the drawer with just 2 pins , and a bit longer leads.I left the battery floating a bit from the PCB , to make it easier to cut the leads on the next battery change.Ohhthe observant reader will notice i used to little heat when soldering the minus on the battery , but the meter is going to sit on my shelf wo. any vibrations etc. So i'm lazy and won't reopen it to redo the joint.Maybe one ought to photograph all the pcb's , it's quite revealing.
From ADS1102CAL+ in ADS1102CML / ?? ADS1102CAL+ ? ADS1102CML - Page 1
Forum section: electronics / testgear

author: gafbich
author_rank: Contributor
timestamp: April 04, 2014, 05:43:18 pm
content: Help to sort out this problem, ordered the motherboard ADS1102CML her and wanted to put in the oscilloscope ADS1102CAL+ but as it was found out, after I sent the seller has sent the photo card) slots for display and cost management bodies are completely different. Help with advice.????? ????,????? ADS1102CML ??? ????? ADS1102CAL+ ???,????(??????)?? ??????.???.Links to pictures:????:1.http://rusfolder.com/403372682.http://rusfolder.com/403372693.http://rusfolder.com/403372704.http://rusfolder.com/40337271

author: gafbich
author_rank: Contributor
timestamp: April 05, 2014, 09:13:53 am
content: UP
The mystery of the HP E3610A DC binding post colors - Page 1
Forum section: electronics / testgear

author: zapta
author_rank: Super Contributor
timestamp: April 05, 2014, 07:42:33 am
content: After watching Dave's eevblog #166 I decided to get a HP E3610A DC power supply and today I picked one I bought on ebay. When I arrived home and tried to use it I noticed something very strange, the colors of the binding posts are red/red/black while Dave's unit had red/black/green (a better IMO).http://youtu.be/-04CQ0Mug1oA quick ebay search that indeed that model come with two different color combinations:http://www.ebay.com/sch/i.html?_nkw=HP+E3610A&_armrs=1&_from=R8&_ipg=Anybody knows the reason for the color variation? I find the red/black/green to be more intuitive.(mine is 120V US unit, made in Korea).
Help needed - Fluke 8840 DMM won't switch on - Page 1
Forum section: electronics / testgear

author: Lamima
author_rank: Newbie
timestamp: April 04, 2014, 04:45:50 am
content: I need some help for a old Fluke 8840 DMM. It has some strange behavior after pressing the power button and perhaps somebody already knows the answer.So, here is the fault:After pressing the power button the display starts to flicker with a random pattern. Sometimes it flickers for 2-3 cycles (each cycle is flickering for about one second, gets dark for a shorter period and starting to flicker again) and then stays dark, some other times it is in an infinite loop of the cycles described above.Any advices where to start my investigations?

author: bimj1
author_rank: Newbie
timestamp: April 04, 2014, 05:51:14 am
content: Do you hear any relays clicking when you turn it on ?U202 the Z8 microprocessor is probably dead.but to be sure you should probably go download the manualhttp://assets.fluke.com/manuals/8840A___imeng0300.pdfand start following the troubleshooting section

author: Lamima
author_rank: Newbie
timestamp: April 04, 2014, 07:45:05 pm
content: No, there is no clicking sound at all. Hopefully the main controller is not dead - it would be a shame if the good old device is not repareable...

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 04, 2014, 08:58:38 pm
content: I would definitely re-solder all the power transformer connections. Very common problem; it happened to mine.Some of the bad connections were not visible as such. Re-solder them all anyway. Pretty good chance this fixes yours.
old and new, same size! - Page 1
Forum section: electronics / testgear

author: jmkasunich
author_rank: Newbie
timestamp: April 04, 2014, 04:04:58 am
content: My Rigol DS1104Z arrived today. The workbench (aka dining room table) didn't have any empty space, so it wound up stacked on top of the venerable Tek 2465. I found it amusing that the front panels are almost exactly the same size.
Tek 2232 Noise reduction - Page 1
Forum section: electronics / testgear

author: Wh1sper
author_rank: Regular Contributor
timestamp: April 03, 2014, 04:31:32 pm
content: As everybody know who is owning and using a tek 2232 the fan is a very noisy item.Ok I'm not using the scope every minute but when I'm using it for debugging audio gear it is a bit of contra productive because the noise is disturbing.So, before I open it and looking into the scope I'm curious if anybody has doing it and substitute the noisy fan against a low noise item?Just to be clear, no the fan seams intact its no mechanical problem, it sounds like simply to high blow and to fast rpm.One possibility is just to cut out every second line of the fan grill.I just hope for a modern PC fan replacement which could be adopted.Greets from Northern Germany, guys :-)Bernd

author: David Hess
author_rank: Super Contributor
timestamp: April 03, 2014, 06:31:33 pm
content: The fans on my 2232 and other 22xx oscilloscopes are almost completely silent and the only way I can know that they are running it to reach back and feel for the warm air flow.

author: Wh1sper
author_rank: Regular Contributor
timestamp: April 03, 2014, 06:53:39 pm
content: All I have found in the net speaks about heave noise like mine...Are your gears Original or eventually already modified or renewed?

author: David Hess
author_rank: Super Contributor
timestamp: April 03, 2014, 09:08:57 pm
content: Mine all have the original fans but some of them may have had the power supply capacitors replaced.It occurs to me though that there are two different 2232 designs; the older one uses a custom Tektronix tubeaxial fan like the other 22xx series oscilloscopes but the late 2232 may use a standard box fan and it could be noisier.I just checked again and while I can hear my 2232 fan, it does not compete with my PC as far as noise.I have not done it on a 22xx series oscilloscope but just oiling and adjusting the fan bearings if possible could improve the situation.
Tektronix 1230 printing to emulated LPT printer - completed with photos! - Page 1
Forum section: electronics / testgear

author: mdanh2002
author_rank: Contributor
timestamp: April 03, 2014, 02:12:27 pm
content: Hi,Out of curiosity I made a PIC24-based virtual parallel port printer in order to transfer screen captures and memory data from my Tektronix 1230 Logic Analyzer to a PC. This is because although my 1230 comes with both Centronics and RS-232 ports, I could not find the Tektronix application software for the RS-232 port (hard-to-find!) as well as the manual, which contains description on the serial protocol needed to pull the data out of the logic analyzer. On this logic analyzer, screen capture can be printed by double-pressing the NOTES key whereas memory contents can be printed by pressing the D key.The virtual printer that I made, is based on a PIC24. It will write any data that it receives from the parallel port onto an SD card. Each print job is written as a separate file. A 1.8" ST7735 color LCD is used to display SD card information and print job details. Text print can be viewed easily by opening the print output file on a PC.As the Tektronix 1230 Logic Analyzer prints its memory contents in text format but prints screen capture in graphics format, I have also written a tool to convert the print job file (containing the Epson escape codes generated by the logic analyzer) back to a 450x250 bitmap file, viewable on a PC.The whole project is completed within three days, from breadboard-prototyping to soldering onto veroboard for more permanent usage.Attached to this posts are some photos of my virtual printer, the bitmap converter tool and its output.Look forward to your comments.See details and download source code at my blog articlehttp://minhdanh2002.blogspot.sg/2014/02/capturing-data-from-tektronix-1230.html
Victor 6056B a Clamp Multimeter for 25€ (teardown) - Page 1
Forum section: electronics / testgear

author: belba
author_rank: Contributor
timestamp: April 01, 2014, 09:47:25 am
content: Hello,in the last days I bought a Clamp Multimeter for 25€. Now I want share some impressions from this gear.The clamp meter comes with some probes, a 9V battery, a bag, and some sheets of paper, called manualSure, I was curious what I got for 25€ so I teared it down before I test it. Internally it looks a little bit like a UNI-T UT204, see alsohttps://www.eevblog.com/forum/testgear/uni-t-ut204-clamp-meter-review-and-tear-down/.I found that internaly two ugly soldered transistor used as diodes, not the best work.As I tested the clamp meter again my Agilent U1272A I was amazed. It is very close to the Agilent.PS: My first post in my poor english after a long long time - sorry for that!

author: belba
author_rank: Contributor
timestamp: April 03, 2014, 01:37:54 pm
content: Here is a photo from the back of the mainboard - not very interesting. I have compared the clampmeter with my Agilent in a hopefully mor accurate way.It seems the cheap clampmeter is surprisingly pretty accurate if I compare it to my 1272.
Rigol pass/fail masks - Page 1
Forum section: electronics / testgear

author: jmkasunich
author_rank: Newbie
timestamp: April 02, 2014, 05:42:45 pm
content: I'm eagerly awaiting delivery of a DS1104Z - reading past threads here was instrumental in making that decision. Thanks!My new scope is for home/hobby use, and I don't expect to be using the pass/fail function much. But at work, things are different. We are at the pilot run stage on a new product. Prototypes involved just a couple boards, and I tested them. Pilot is a few dozen boards. Not enough to justify real automation, too many for me to test. Some things are easy enough to hand off to a technician - "measure this voltage, should be between X and Y". Others aren't so easy, they involve interpreting scope traces.Pass-fail masks would be ideal, if I could give the tech a USB stick or something with the masks on it, tell him where to hook the probes, what scope settings to use, and what mask to load.I've read the pass/fail section of the Rigol user manual, and the programming manual. I've also searched this forum and the larger web for info about using the pass/fail function. So far, the most informative thing I've found is this video:It appears that the pass/fail mask is created by adjusting the width and height around a previously acquired "good" signal. I can't find anything that says you can save a mask for future use and then load it later. In a production test environment, it would be much more useful to have masks based on a known good board tested last month, and let the technician apply those masks to signals on each board from the batch that arrived today.Has anyone used this function? Is it possible to save/restore masks? Is there some indirect trick that could achieve the same result? (For example, load a reference waveform from USB, then use it to define the mask.)Thanks,John

author: Mark_O
author_rank: Frequent Contributor
timestamp: April 03, 2014, 07:20:29 am
content: Quote from: jmkasunich on April 02, 2014, 05:42:45 pmHi, John. I haven't used it myself, but the Rigol's support Mask Save/Load directly. From Chapter 9 for the DS1000Z:"To Save the Test MaskUsers can save the current test mask to the internal Flash memory or external USBstorage device. The file format of the test mask file is “*.pf” . The internal memorycan store at most 10 test mask files (LocalPF.pf).Press Save to enter the file store interface. Please refer to the relative descriptions in“13 Store and Recall” to save the test mask file to the internal or external memory.To Load the Test MaskUsers can also load the test mask files (*.pf) stored in the internal Flash memory orexternal USB storage device to the internal memory.Press Load to enter the file recall interface. Please refer to the relative descriptionsin “13 Store and Recall” to load the test masks to the internal memory of the instrument."
MDO3000 I2C decode video - Page 1
Forum section: electronics / testgear

author: dc101
author_rank: Regular Contributor
timestamp: April 03, 2014, 03:17:34 am
content: Just wanted to post a real quick video showing the MDO3000 decoding I2C. I'll be heading back to the Design West / EE Live show tomorrow if anyone has any burning requests for quick tests on the MDO.http://youtu.be/koSLJQzPl1g.The decoding seems way faster and more responsive than my old MSO2000b although Tektronix said decoding was still software based.

author: miguelvp
author_rank: Super Contributor
timestamp: April 03, 2014, 03:34:19 am
content: Quote from: dc101 on April 03, 2014, 03:17:34 amFixed the link for ya

author: dc101
author_rank: Regular Contributor
timestamp: April 03, 2014, 03:35:57 am
content: Lol thanks man, see what happens when I have to use my ipad instead of my laptop?

author: Mark_O
author_rank: Frequent Contributor
timestamp: April 03, 2014, 03:41:00 am
content: Quote from: dc101 on April 03, 2014, 03:17:34 amThanks, but your link 404's for me. Ah, I see the problem. The period ending the sentence is attached the the URL. I removed it in my quote above.[and Miguel fixed it before I finished. I must be slow.]Question: what good is very fast updating of the protocol strings? At a certain point, it's all just a blur, and you can't read it, or glean much info from it.What am I missing?(I do protocol analysis almost every day, but most of it is post-op of a capture. And not live.)

author: dc101
author_rank: Regular Contributor
timestamp: April 03, 2014, 03:49:21 am
content: You're absolutely correct that you can't watch it real time (and get useful info), but you can set the trigger to any number of protocol events or payload data. So if your scope is so slow that it can only decode every 4th or 5th packet then it might take a while for it to find and trigger on the specific packet/data you are interested in if it's even able to find the packet.

author: mwilson
author_rank: Contributor
timestamp: April 03, 2014, 03:52:45 am
content: Quote from: Mark_O on April 03, 2014, 03:41:00 amOne advantage, I would guess, is that because the scope can do the decoding very quickly, it should be able to trigger on specific infrequent conditions (like I2C address or data packet bits) with a lower risk of missing that infrequent packet between waveform updates. I'm guessing that a scope that can't keep up live like that Tek or the Agilents might miss more potential trigger points. But I agree just watching the blur of data fly by doesn't seem helpful.

author: Mark_O
author_rank: Frequent Contributor
timestamp: April 03, 2014, 05:04:40 am
content: Thanks, guys. Those are good answers.The blur in that video reflects that fact that it's triggering on every packet (or trying to). But by selectively triggering on, say just "I2C Writes to a specific address", that could provide valuable real-time feedback. Because the filtering would reduce the update rate substantially.Quote from: mwilsonWell, the Teks use software decoding, but the Agilents have been hardware for some time. So of all the decoding scopes, they're theleastlikely to miss triggers.
Ratio Function On a Sencore FC-71  - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: April 06, 2014, 10:53:35 pm
content: How does this function work with a single input?They're advertising hype made this function sound like a time saving addition. What does it do? I'm only familliar with ratio function on a two channel counter and don't really see how this would be a time saving feature for a product designed for working on consumer electronics or communications shops. I think this function is also found in their Autotracker scopes IIRC.I don't have a FC-71 or have been able to find any operational information. I have an opportunity to purchase one at a pretty good price. I purchased a DVM56A from the same estate and for a DVM made back in '79, I have to admit I'm quite impressed with the unit's accuracy and build quality for a service instrument. I really don't need another counter, but this unit does have a built in audio scaler in two ranges that would make some audio measurements much easier.

author: G0HZU
author_rank: Super Contributor
timestamp: April 06, 2014, 11:53:51 pm
content: I'm guessing you feed the high frequency signal into the 1GHz input and the low frequency input into the 100MHz input and it tells you the ratio of the two signals. Not sure how often this would prove useful.I guess a lot depends on what you want to use the instrument for and what performance level you need. Sencore isn't a brand name I would have on my shopping list for a counter though...

author: Dawn
author_rank: Regular Contributor
timestamp: April 07, 2014, 12:30:49 am
content: I really don't need another counter. I have Kiethely 776's on both benches. I've been trying to broaden out my test equipment a bit as I'm now pretty much retired and most of my equipment has been focused on RF maintainance and specialized.Sencore often had novel tricks up their sleeves as productive instruments, not necessarly high end, but features that expedited servicing. It wasn't equipment I encountered much during my career where we either used lab equipment or high end test sets. I've picked up a few pieces and have to admit, their equipment made after the 80's must have gone through a transformation in QC. I'm looking at moving soon and might give a thought to doing some general service work including audio. Some of their analyzers begin to look appealing much as service monitors were to my past profession as well as some of their general test equipment.From what I gather from a brochure, the ratio function is done with the same input and the unit itself is a single channel that's switched between an audio scaler, direct, and prescaler. The two inputs are one 50 ohm terminated and a high impedance input with a variable sensitivity amplifier/"de-noising" stage. Again, not sure what they're getting at. It's another one of their gimmicks they're famous for. From the few pieces I do own now, you do get to like their instruments and ingenuity with use. They do grow on you.
[HACK] OWON PDS5022S  - Page 1
Forum section: electronics / testgear

author: allenpan
author_rank: Contributor
timestamp: April 02, 2014, 12:42:13 pm
content: OWON PDS5022Sis it possible? seems to be cheap? does it able to unlock to 100Mhz as this one is 25Mhz, and is there other accessories modules? such as make it LAN ready?
Extech330 random numbers on CAP mode - Page 1
Forum section: electronics / testgear

author: daemonix
author_rank: Contributor
timestamp: April 02, 2014, 08:59:28 am
content: Hi all,I get some random number in the for of a offset when I turn my meter on to CAP mode.The meter is around a month old and I dont remember if that was the normal operation from day one...I now that you can get some random number when you measure Voltage and the probes are unconnected, but I dont know if this is normal with capacitors.Thanks

author: daqq
author_rank: Super Contributor
timestamp: April 02, 2014, 10:03:28 am
content: Yup, it is normal - imagine the probes like two plates of a capacitor. Also, there's a lot of parasitic capacitance from all around... so yeah, there's no such thing as 0pF (assuming it's not zeroed out) on a good working meter.

author: daemonix
author_rank: Contributor
timestamp: April 02, 2014, 10:19:39 am
content: thanks!
difference between rangefinders and distance meters? - Page 1
Forum section: electronics / testgear

author: ixfd64
author_rank: Frequent Contributor
timestamp: April 01, 2014, 12:41:37 am
content: Are there any significant differences between a rangefinder and a distance meter?I know they both use laser pulses to measure the distance to an object. But from what I gather, rangefinders generally refer to outdoors and military equipment whereas distance meters usually refer to construction tools. Am I missing anything?

author: Rigby
author_rank: Super Contributor
timestamp: April 01, 2014, 12:58:23 am
content: Quote from: ixfd64 on April 01, 2014, 12:41:37 amsounds like you are. range and distance are subtly different. range finding approximates long distances, and sees a lot of outdoor use. when you want to know where to drop a bomb that can land anywhere within a quarter mile circle, you need the range, the approximate distance. when you are building a structure you need some known quantity of precision.

author: Rigby
author_rank: Super Contributor
timestamp: April 01, 2014, 01:01:19 am
content: or maybe I'm the one who doesn't know. I have no idea if I am right, only what I was taught, long ago.

author: poodyp
author_rank: Regular Contributor
timestamp: April 02, 2014, 12:45:10 am
content: A range finder typically is integrated with a spotting scope, with or without magnification, whereas a distance meter is just a box with a readout.
Agilent MSOX-3054a Upgradeable to 1Ghz? - Page 1
Forum section: electronics / testgear

author: jstarr
author_rank: Regular Contributor
timestamp: April 02, 2014, 06:03:27 pm
content: Is the MSOX-3054A firware/software upgradeable to 1 Ghz or is that only in hardware?john

author: eurofox
author_rank: Unknown
timestamp: April 02, 2014, 06:31:34 pm
content: I have the 1 Ghz version, I think the hardware is different

author: MarkL
author_rank: Unknown
timestamp: April 02, 2014, 06:51:53 pm
content: The 500MHz to 1GHz upgrade has to go back to Agilent for a board swap.The BW upgrades that are only license keys are: (from the 3000X datasheet)DSOX3BW24 100 MHz to 200 MHz, 4 ch, License onlyDSOX3BW52 350 MHz to 500 MHz, 2 ch, License onlyDSOX3BW54 350 MHz to 500 MHz, 4 ch, License only

author: EEVblog
author_rank: Unknown
timestamp: April 02, 2014, 08:28:08 pm
content: It's a hardware board swap.
Need To Replace Fluke "Ground Lead with Mini Alligator" - Page 1
Forum section: electronics / testgear

author: 691175002
author_rank: Regular Contributor
timestamp: March 29, 2014, 04:18:36 am
content: I've run across some equipment that is unfortunately missing these ground leads. I've tried looking around but I'm finding it very difficult to obtain these without just buying an entirely new set of 150$ probes.Anyone know how I can get just the ground leads, or perhaps an equivalent product that isn't from Fluke?Thanks

author: VK5RC
author_rank: Unknown
timestamp: March 29, 2014, 04:34:34 am
content: What connector is on the other end of the ground lead? One source may be Probe Master.

author: commongrounder
author_rank: Frequent Contributor
timestamp: March 31, 2014, 02:44:26 pm
content: Fluke probes are made by the company Multi-Contact in Germany. The part number for the replacement reference (ground) leads are: GM-200 (for silicone wire) and GM-200F (for PVC wire). I'll leave you to search for a source and cost for these. I know they aren't cheap. They are an important part of the catagory safety rating of the probe.There are some Chinese knock-offs available on ebay (search for isolated probes). I have no idea what their build quality is, though. Good Luck!

author: 691175002
author_rank: Regular Contributor
timestamp: April 01, 2014, 12:35:48 am
content: Thanks for the help so far, but I'm finding myself just getting more confused as I try to figure out exactly what fluke sells.In particular, what exactly does the STL120-III come with? The fluke webpage suggests its just the leads and even explicitly states it has two pieces, but webpages that are actually selling STL120-III show it as a full set in the pictures and even list 8 separate part numbers for the components.http://www.fluke.com/fluke/m3en/accessories/Test-Leads-Probes-and-Clips/STL120-III.htm?PID=73534http://www.have-digitap.nl/product/test-en-meetapparatuur/accessoires/accessoires-voor-oscilloscopes-en-scopemeters/fluke-stl120-iii/PID60http://www.amazon.com/Fluke-STL120-III-Shielded-Bandwidth-Length/dp/B005H0NK8MIt is looking like the STL120-III will cost at most a few dollars more than a pair of ground leads, but I need to know how it compares to RS120-III to figure out which will work better for me.
Difference between Brymen TBM867 and BM867 Multimeter - Page 1
Forum section: electronics / testgear

author: shinnok
author_rank: Contributor
timestamp: March 30, 2014, 08:33:30 am
content: What does the T actually stand for? Asking since in .eu I can't find the TBM version, only BM.http://www.tme.eu/en/details/bm867/portable-digital-multimeters/brymen/

author: Bored@Work
author_rank: Super Contributor
timestamp: March 30, 2014, 09:26:05 am
content: You could try asking Brymen: info at brymen.com

author: Deckert
author_rank: Regular Contributor
timestamp: March 30, 2014, 10:13:52 am
content: Quote from: shinnok on March 30, 2014, 08:33:30 amThey are exactly the same - here in South Africa (and I suspect elsewhere) they are distributed by Toptronic, so the model number is prefixed by a "T" and the name plate insert is slightly different, but there is no difference between the TBM867 and the BM867.--deckert
Hantek 6022be view watt RMS ? New Software? - Page 1
Forum section: electronics / testgear

author: marpolsdofer
author_rank: Newbie
timestamp: March 28, 2014, 07:40:05 pm
content: Hello guys I am now to this site and as well to Oscilloscopes.I been messing around with the Hantek 6022b and trying to figure it out, doing well so far.I bought this thing for car audio but also for fiddling around, should have had one years ago.Anyways, is there a way to view the Watt RMS and not just the voltage RMS?I also been reading about this new softtware for it a few times. Is it out yet? If it is, anyone can provide me a link or the file?Thanks guys

author: marpolsdofer
author_rank: Newbie
timestamp: March 29, 2014, 07:11:48 am
content: Common some one has to know. I could not find anything of watt RMS on this site and I found mnetion of new software made by some one else but I don't know where to find it.

author: pickle9000
author_rank: Super Contributor
timestamp: March 29, 2014, 07:17:00 am
content: It's a long thread, but the software and developer are therehttps://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/

author: Mark_O
author_rank: Frequent Contributor
timestamp: March 29, 2014, 07:45:25 pm
content: Quote from: marpolsdofer on March 29, 2014, 07:11:48 amOur deepest apologies. We did not immediately recognize your eminence. There's simply no excuse for keeping you waiting over 12 hours for an answer, on a Friday night. We are grateful you waited until 2am for a reply, and sorry we failed you.Please forgive us. We have the highest regard for those who register at this Forum, take no time to do even a rudimentary search, post their first question 6 minutes later, and are upset when they don't get an instantaneous response.

author: mjkuwp
author_rank: Unknown
timestamp: March 30, 2014, 01:14:52 am
content: http://www.hifi-writer.com/he/misc/rmspower.htm

author: tom66
author_rank: Super Contributor
timestamp: March 30, 2014, 01:56:31 am
content: I hope you realise "watt RMS" is like saying "amps current"; it's unnecessarily over-stated.Further, you can simply apply the Electronics 101 formula: V^2/R for power. Maybe there's a math function if you want to view the realtime power vs average. For average you can calculate rms voltage and use that in V^2/R for the power.
Keithley 182-M - Page 1
Forum section: electronics / testgear

author: acbern
author_rank: Frequent Contributor
timestamp: March 29, 2014, 08:24:45 am
content: This is to share some info with you since I did not find anything on the net and maybe others can contribute too with more insights:Months ago, I did buy my first Keithley 182 nanovoltmeter, essentially to null my Fluke 752 divider. This turned out to be a painfull thing, as the noise level (also driven by the output impedance of the 752) is pretty high. It was essentially impossible, without using the digital filter, which made things pretty slow, to a point where you normally give up because it is too time consuming. So I decided to use the 182 for other stuff and buy a Keithley 155 when I would find one cheap.By coincidence, a little later, I saw a Keithley 182 in the bay, not working, and I thought I buy it for spares if cheap. It turned out (had overlooked that on the picture), that this was a 182-M. Never heard about it and found no data on the net. So I opened it up, and the interesting thing is, it has a 9V battery in its input curcutry (normal 9V block with the usual clip contact in some tye of a holder). My obvious assumption is (I did not analyze the circuitry, it also includes a small PCB with not many parts on it) that the battery drives the input amplifier. The interesting thing about this meter is that it has a substantially lower noise level, and I can well use this as a nullmeter for the 752, even with the filters switched off.So, if anyone has some more data to share here, amybe also in conjunction with nulling the 752 and its stability, would be interesting.ThanksAdrian

author: TiN
author_rank: Super Contributor
timestamp: March 29, 2014, 12:03:28 pm
content: Can you make some photos?KEI also have some other meters with -M suffix. Maybe it means "military" or "magical", I don't know.There are even DMMs , manual mentions about 2001-M as well.

author: acbern
author_rank: Frequent Contributor
timestamp: March 29, 2014, 12:25:10 pm
content: Thanks. Photo will not reveal much, exactly the same as any 182, except behind the '182' there is a '-M'. Thats also why initially I did not even realize it is not a normal 182.My first assumption also was it's military. But reality also is, it behaves much better, so maybe this was improved version that was available. Or the military guys got better units from Keithley than the rest of the world. Onscreen menue is the same (same setting options and so).I seems to be good also for thermal converter measurement/calibration (where you do comparison measurements anyhow), where absolute accuracy is not so important but noise is.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 29, 2014, 03:12:08 pm
content: Could mean military a la Fluke 27FM or m could mean mobile (because it's battery powered)
Anyone seen these Hantek functions generator? HDG2000B / HDG2000C - Page 1
Forum section: electronics / testgear

author: slow_rider
author_rank: Regular Contributor
timestamp: March 28, 2014, 08:11:35 pm
content: I'm looking to upgrade my function generator setup in a few weeks and started researching the web. I came across these function generator from Hantek. The HDG2000B model is just $250 + shipping which is almost hard to believe. The problem is that I don't know the brand or even if they actually make these or just re-brand someone else's products?Here's a link to the product page from Hantek's website:http://www.hantek.com.cn/en/ProductDetail_12_149.html

author: Bored@Work
author_rank: Super Contributor
timestamp: March 28, 2014, 09:46:14 pm
content: Quote from: slow_rider on March 28, 2014, 08:11:35 pmHantek? They have been discussed extensively here. Key points are they more or less know how to do hardware but with quirks. Also, not everything they announce is available. I would be surprised if they really produce the seven versions they announced as HDg2000B series.And their software sucks. This applies to their instrument's firmware which they love to mess up in interesting ways. And their PC software is complete rubbish.QuoteSome of their stuff, e.g. some of their power supplies, is rebranded. Their HDG1000 series looks like it is rebadged Atten/Siglent stuff. The HDG2000B's look doesn't ring a bell, but there is of course a chance it is rebadged.

author: slow_rider
author_rank: Regular Contributor
timestamp: March 28, 2014, 10:08:55 pm
content: Bored@Work - So if I'm putting this up against the Siglent SDG1020 or the ATTEN ATF20B or the Rigol DG1022 which one would you, personally, recommend and why? Assuming you know the models...

author: pickle9000
author_rank: Super Contributor
timestamp: March 28, 2014, 11:12:26 pm
content: I have a Siglent SDG1020. I tried the software before purchasing and that was the deciding factor.There was a early version of the SDG1020 that had a problem. To their credit Siglent came up with a fix and let the information out on how to do the fix yourself. That's pretty rare.So far it has done and performed as expected, fairly unusual in my experience. I guess that means I like it.

author: Macbeth
author_rank: Super Contributor
timestamp: March 29, 2014, 12:34:59 am
content: I have a Siglent SDG1025. The waveform software may be adequate in USB-RAW mode, but I found the fact it supports NI-VISA drivers in USB-TMC mode excellent!Sadly my Hantek MSO5102D scope only works with its proprietary drivers, and they are a fucking nightmare to install (hint: disable internet connection so Windows 7 doesn't find another 'newer' driver online). Happily the hacking community have documented most of the shitty protocol. Sadly the MSO logic analyzer hasn't been hacked, so that option is nearly useless as you can't do I2C or even simple ASCII / HEX on the scope itself. This would be piss easy to implement on a PC. In fact it is now my current goal.
Rigol DG4162 phase noise - Page 1
Forum section: electronics / testgear

author: Matthias Toussaint
author_rank: Contributor
timestamp: March 28, 2014, 10:27:58 pm
content: Just in case someone is interested, I've attached some phase noise measurements from the Rigol DG4162 waveform generator. Actually not too shabby. First harmonic is 50dB down, which is ok. There's kind of a hill around 100kHz. Not sure what that is. Maybe the PLL for the internal clock.

author: JackOfVA
author_rank: Unknown
timestamp: March 28, 2014, 10:36:55 pm
content: Just for curiosity, if you have the equipment, check the internal 3rd order intermodulation products.Set Ch 1 for some frequency, say 3 MHz and Ch 2 for 4 MHz and combine the two outputs in a hybrid combiner. Probably will need an isolation pad between each output and the hybrid combiner. The look at the output with a spectrum analyzer for 3rd order products at 2 and 5 MHz. This will tax your spectrum analyzer as well, and it may be necessary to use a notch filter to remove the 3 and 4 MHz test signals, as well as narrow RBW and extra attenuation on the SA input.One of my main products lines is ultra high performance low noise figure radio preamplifiers with 2nd order intercepts of +100 dBm or more and 3rd order intercepts > +45 dBm. I had hoped to use my DG4100 as a source of test tones and retire, for that purpose, the pair of HP 8657A generators, auxiliary amplifiers and attenuators, etc. Alas, it seems that is not possible as the DG4100 has an internally generated 3rd order intermodulation product that is above that produced by my amplifiers. This is a "problem" that probably affects half a dozen people in the world who own a DG41xx series generator but I am curious whether my observations can be duplicated with a different instrument.

author: Matthias Toussaint
author_rank: Contributor
timestamp: March 28, 2014, 11:49:54 pm
content: Not sure if that is what you wanted to see. I'm back home (The FSUP is at work) so I have to do the test with my DSA815. This is probably more a SA test. The 3 and 4 MHz signals are padded down by 10dB before the combiner. At the input of the SA is another 6dB attenuator. The 2Mhz seem to be around -85dBc and 5MHz around -72dBc. I don't have a notch filter at hand to knock down the 3/4 MHz carrier, so this measurement might be useless
Hardware Production Test Techniques - Page 1
Forum section: electronics / testgear

author: MixedSignalSystems
author_rank: Contributor
timestamp: March 28, 2014, 10:03:15 pm
content: Earlier today, a former colleague of mine asked me if I knew of any good books on "System-Level Production Test Techniques".This person is an experienced IC test engineer that is transitioning into a new role as an embedded system production test engineer. They are very familiar with test concepts and want to understand system level considerations.There are many great books on mixed-signal IC test techniques. Like me colleague, I assumed that there would be plenty equivalent books on system level production testing.A search on Amazon has come up surprisingly short and I'm a bit stumped.Any recommendations for a good book (or other resource - app notes, forums, blogs, etc.) on embedded system production testing would be greatly appreciated.Topics of interest include:Production Test HardwareTest Jig DevelopmentBed Of NailsFlying ProbeBoundary ScanIn-System ADC/DAC Test Techniques (Though these are well covered in IC Test books)In-System Memory Test Techniques (Volatile and Non-Volatile)In-System Interface Test Techniques (UART, Ethernet, USB, etc.)In-System Peripheral Test Techniques (LEDs, Push Buttons, Switches, etc.)BISTUse of system processor(s) for production test purposesProgramming techniques for non-volatile memory for processors and FPGAs during production test (JTAG, BSCAN, etc.)The above list is a bit of catch all but I'm keen to hear about any good resources. I've already referenced the EEVBlog DFM videos
Agilent ESG-D 4433B Signal Generator motherboard bad EEPROM, HELP - Page 1
Forum section: electronics / testgear

author: fmav
author_rank: Newbie
timestamp: March 27, 2014, 10:37:22 pm
content: Hello,I recently purchased a ESG-D 4433B signal generator as non working. I first replaced the faulty LCD, but after that, I couldn't get the instrument to start. After some hours of searching I found out that the eeprom U106 (28c256) on the motherboard is empty (or dead), as I read only FFs from it.Does anybody have the hex file of the contents of this chip? Any help would be appreciated! Thank you
Audio Load/Wattmeter Project Ideas - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: March 27, 2014, 02:15:49 pm
content: Rather then hash up an older thread from a week ago regarding using a voltmeter/scope across a load, that was typical practice when I serviced and rebuilt amps for a couple of local high end shops during the 90's. Just a large non-inuctive load resistor mounted on a board with terminals is all I used. Octopus hookup, but worked.I also use something similar for communications. Old, mobile speakers on the benches with switchable load resistors and a bnc output as a test fixture to feed an audio volt meter/distortion analyzer.While I haven't done any audio work for over 18 years and it's no longer a personal interest now that I'm married again...yeah, that reason. I'm sort of tempted now that communications work is beginning to vaporize. I'm entering into retirement soon anyways.I've always admired these test units like Sencore's PA-81 ( I think that's the model) and others that combined a high power, multiple impedance load with a direct reading wattmeter and other features that allow a comprehensive test beyone sinewave output power into a static load. I'm looking at this in a building block as I go project.I've seen some of the load resistors from China and it would be pretty economical to build up a two channel high power load and use some metering ideas as well as direct scope output. I see some of the newer units have a speaker approximation load that uses some kind of a motor as a varying load to test amp stability. Something new to me.Anyone have any pet metering circuits or ideas for a direct reading analog meter to 200-250 watts? For the load, I figured on copying Heathkit's or the one in Sencore's old receiver test unit, SG-165 and maybe borrow some meter ideas from that unit to start with. If I do this again, I don't want to work with a rats nest of wires and have to switch a single load between channels.
So i decided to take apart one of my benchtop power supplies..(intend to mod) - Page 1
Forum section: electronics / testgear

author: Technicial
author_rank: Newbie
timestamp: March 26, 2014, 12:22:59 am
content: And i found this hehe (see picture) made in canada. Awesome. I dont have much test gear made in my own country.As for modding the supply, I plan to replace the fine and coarse pots with a 10 turn pot. As for the power supply. Its a Xantrex LX30-3 supply i believe, the model number is next to impossible to read, its pretty faded.over all. I like the supply. Cant say i have any problems with it. Anyone else here have it or used it?pictures:https://lh5.googleusercontent.com/-Lzib0Ei-UUE/UzIboCILG4I/AAAAAAAABnw/WRjcyjHpH5c/w426-h568/IMG_20140325_205010.jpghttps://lh5.googleusercontent.com/-mctk0XPWK1U/UzIbxMpy0CI/AAAAAAAABoY/ydGaJ_AXR48/w426-h568/IMG_20140325_205023%255B1%255D.jpghttps://lh3.googleusercontent.com/-KgtYLc-55YQ/UzIcIF4YV8I/AAAAAAAABpI/oYf-8HNBxrg/w426-h320/IMG_20140325_205157%255B1%255D.jpghttps://lh6.googleusercontent.com/-p3Zc7aXfzNk/UzIcaCn7asI/AAAAAAAABqQ/Yr09Q0nauXM/w426-h568/IMG_20140325_210149%255B1%255D.jpgSorry for long links. momentary fix for camera uploading problems.