hybridfree/eevblog-posts huggingface dataset:
Siglent SDS12102X-E CAN Eres filter time constants - Page 1
Forum section: electronics / testgear

author: klaff
author_rank: Regular Contributor
timestamp: May 26, 2017, 01:21:55 am
content: Playing with the Eres function on the scope. Plumbed the Trig Out signal into Channel 1 (via 10x probe and nifty probe-BNC adapter) and grabbed images looking at that signal with Normal acquisition, and with Eres set to 0.5, 1, 1.5, 2, 2.5, and 3 bits of "enhancement". Eres mode and zooming are mutually exclusive, which rules out Eres as useful for much work, IMO. Looks like bandwidth at 1 GSa/s and 3 bits Eres is around 7.5 MHz, 2.5 bits 15 MHz, 2 bits 30 MHz, 1.5 bits 60 MHz, 1 bit 120 MHz.Adding a capture with 20 MHz bandwidth setting for comparison.

author: klaff
author_rank: Regular Contributor
timestamp: May 26, 2017, 05:12:33 am
content: Looked at the CSV files to see if the "enhanced bits" are available, but it appears they are not. The scope appears to be scaled (as I think rf-loop has stated here before) such that the 256 levels of the 8-bit A2D are mapped to 10.24 divisions or 25 levels per division, and the number of levels found in the file doesn't change between Normal Acquisition and Eres.

author: rf-loop
author_rank: Super Contributor
timestamp: May 26, 2017, 05:16:50 am
content: It follow this principle:http://cdn.teledynelecroy.com/files/appnotes/an_006a.pdfSmall note: Your conclusion about frequency response is somewhat suspicious. Why? Because true effective risetime in scope input BNC center tap is really undefined. But of course, naturally , due to simple math, every "half bit" reduce BW to half.Also it need remember that system rise time (what you see finally in scope screen) follow this principle SQR (( trise1 ^2) + ( trise2 ^2 )).But anyhow thanks about this example.

author: klaff
author_rank: Regular Contributor
timestamp: May 26, 2017, 05:42:00 am
content: I already read that, having seen where you posted it previously, thanks!I agree that my bandwidth values should not be taken as precise values but as rough approximations. Neither the Eres shapes nor the 20 MHz BW filter are the gaussian shape that the famous bandwidth equation (.35 = Tr*BW) is derived from. I was mainly just looking out of curiosity; I'm not sure what I would use the Eres feature for, especially since you can't get at the higher resolution data!On the other hand, I am very pleased with the serial decoder functionality. I captured 280 ms of CAN bus traffic and could scroll through a list of the 800 or so transactions that my system did in that time. If I pan the zoomed view, the highlighted line in the list follows along! Neat!On the other (third?) hand, I have found a few little bugs and quirks and managed to get it to lock up once.So far I give it a B+, or maybe an A- if one reminds me that not too much cash left my wallet.
New Agilent 82357b 's on EBAY for $99.00 - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: May 25, 2017, 01:03:01 am
content: USB to GPIB. I have a real one but I want a backup plus I would want one on my other bench. Has anyone bought one of these and do they really work identically to the Agilent? They look like a Chinese copy but show "Agilent" on them.Sent from my iPhone using Tapatalk

author: shteii01
author_rank: Frequent Contributor
timestamp: May 25, 2017, 01:04:42 am
content: lolI aint wasting 99 USD.Read this:http://egirland.blogspot.com/2014/03/arduino-uno-as-usb-to-gpib-controller.html

author: daveyk
author_rank: Frequent Contributor
timestamp: May 25, 2017, 01:11:30 am
content: Quote from: shteii01 on May 25, 2017, 01:04:42 amI'm not going to build one from an arduino. I have zero experience with them and not the time.So you're telling those 22357b for $99 on eBay don't work? It's not a waist if they work as the real thing is $700/$800.Sent from my iPhone using Tapatalk

author: gslick
author_rank: Frequent Contributor
timestamp: May 25, 2017, 01:17:12 am
content: Quote from: daveyk on May 25, 2017, 01:03:01 amhttps://www.eevblog.com/forum/testgear/flood-of-new-agilent-82357b-gpib-usb-adaptors-on-ebay-the-real-deal/

author: daveyk
author_rank: Frequent Contributor
timestamp: May 25, 2017, 01:21:49 am
content: Quote from: gslick on May 25, 2017, 01:17:12 amThank you. I can never find anything searching with this iPhone app. Nothing came up.Sent from my iPhone using Tapatalk

author: shteii01
author_rank: Frequent Contributor
timestamp: May 25, 2017, 08:47:11 am
content: I never used word work.I don't consider plugging a few wires into Arduino a build.Quote from: daveyk on May 25, 2017, 01:11:30 am

author: nctnico
author_rank: Super Contributor
timestamp: May 25, 2017, 08:51:31 am
content: Quote from: daveyk on May 25, 2017, 01:03:01 amI paid $50 for mine which is already way too much for a clone.

author: CJay
author_rank: Super Contributor
timestamp: May 25, 2017, 09:03:09 am
content: Quote from: nctnico on May 25, 2017, 08:51:31 amAgree, but does it work and how do you tell they're clone without having one in your hands?I suspect the only way to be sure is to buy direct from Keysight or their authorised dealers?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 25, 2017, 09:49:14 am
content: If keysight still sell them, i dont think so, that's why they arent cheap ... not even sure that the seller are sure they are legit ones ??There are very good fakes, they have learn to better imitate the plastic casing logosThis one seem's very promisingUGPlus USB to GPIB Controller Made in USA :http://www.ebay.com/itm/172082405115?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649

author: EEVblog
author_rank: Unknown
timestamp: May 25, 2017, 11:30:23 am
content: Quote from: Flinstone on May 25, 2017, 09:53:48 amLooks legit!
Opening a Wavetek Meterman 5XL - Page 1
Forum section: electronics / testgear

author: Ochsenfrosch
author_rank: Newbie
timestamp: May 25, 2017, 07:59:24 am
content: My old faithful. Don't remember the price, but it's the low end model of the series.It's only CAT II and has only 200mA max current.
TDS380 Screen Capture/GPIB - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: May 24, 2017, 03:28:20 am
content: Wavestar 3.0 does not appear to support the TDS380. Older versions may have but I could barely find the last version 3.0.OpenChoice Desktop which I use with my TDS3032 does not support the TDS380.Does anyone have screen shot software for the TDS380 or an older version of Wavestar that would support it?As far as controlling the instrument, the command set looks very close to the TDS3000 series. Little changes may be needed.Dave

author: KE5FX
author_rank: Super Contributor
timestamp: May 24, 2017, 04:42:12 am
content: See my reply to rx8pilothere. I don't know if my quick-and-dirty freeware app can grab a plot from a TDS300-series -- my guess is not -- but the other program I mentioned (PrintCapture) probably can. Only drawback is it's not free.
Tektronix 2213 issue - Page 1
Forum section: electronics / testgear

author: rjsalvi
author_rank: Newbie
timestamp: May 24, 2017, 02:58:34 am
content: Hi All! Picked up a working 2213 for next to nothing -- probes included -- and summarily recapped the PSU. Dropped it off at a Tek calibration center about a week ago and it has a "functional failure". The remark is: "Unit has a residual background signal present on timing test that prevents data collection and calibration/adjustment." One might interpret this as PSU noise? If so, what might I have missed? Any pointers in the right direction are appreciated. Thanks.Edit: I do have a SM.
Siglent SDS12102X-E CAN decode/trigger question - Page 1
Forum section: electronics / testgear

author: klaff
author_rank: Regular Contributor
timestamp: May 22, 2017, 04:10:26 pm
content: Hi,I'm using the CAN features, both triggering and decoding, and I'm a little confused by the setup. I've got CANH on CH1 and CANL on CH2 and can get the functions to work with Source selected as CANH, CANL, or CANH-CANL. CANH and CANL each have their own threshold, and that makes sense, although it may not work correctly on a system with large but acceptable common-mode noise level. The CANH-CANL choice would seem to make more sense, but there's no threshold adjustment for the difference. Does anyone know precisely what the scope is doing in that case? Experimentally, it seems to not be different than just using CANL.There's also an odd bug in which the thresholds for CANH and CANL can't be set to greater than 0.75 V, but selecting 1x instead of 10x probe setting allows setting of a useful value (e.g. 0.34 V), and after resetting the probes to 10x the useful value is scaled correctly (e.g. 3.4 V).I also notice that the CAN decoding doesn't work for history pages, the decoded values stay on the screen but only reflect the value of the last capture.Thanks.

author: tautech
author_rank: Super Contributor
timestamp: May 22, 2017, 08:15:29 pm
content: Threshold bug known and you are using the current workaround, 1x probe settings.New FW is being worked on ATM, hopefully it's not far from coming out.

author: klaff
author_rank: Regular Contributor
timestamp: May 22, 2017, 09:35:35 pm
content: Thanks. Do you know about the CANH-CANL question? I'm trying to figure out if it is not fully implemented or if I don't understand the setup correctly.

author: tautech
author_rank: Super Contributor
timestamp: May 22, 2017, 10:07:19 pm
content: Quote from: klaff on May 22, 2017, 09:35:35 pmNot right now.I did have a quick fiddle with Decode and noticed a couple of things "not quite right" and forwarded them to the factory along with other reports of apparent bugs.I was asked by Siglent to send my test board (STB3) to member Defpom for a wider range of signals to use in his YT reviews so ATM I don't have a signal source to check Decoding until my next stock order arrives.Maybe others can chime in with their findings.

author: klaff
author_rank: Regular Contributor
timestamp: May 23, 2017, 05:16:14 am
content: Thanks. I just got the scope last week and have been breaking it in. Got EasyScopeX running tonight over USB.
Is there a cheap programmer than can read from/write to SRAM style memory? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: April 08, 2017, 12:16:37 am
content: Hi,I've got a friend with one of those battery backed up SRAM's in a scope for calibration data. If he gets a new part, is there a simple tried and true usb style programmer with a ZIF socket that can read data from the old and write to the new? It has address lines, data lines, OE, RD, WR.Thanks,Alan

author: james_s
author_rank: Super Contributor
timestamp: April 08, 2017, 12:27:54 am
content: The common TL866 can read and write some of them. You do need to be careful though, I pulled the DS1644 from two different TDS340 scopes, read it, reinstalled and it had lost the calibration constants. Beats me why, the data it read looks ok, and by writing it I could set the time and date back to the values I had read from the chips. It's possible the battery was just marginal enough that heating up the pins corrupted the data, I don't know.

author: David Hess
author_rank: Super Contributor
timestamp: April 08, 2017, 11:06:37 pm
content: Quote from: james_s on April 08, 2017, 12:27:54 amThe same thing happened to me when I read the Dallas NVSRAMs from my 2440. The programmer I used worked correctly with the replacement memories and I never resolved what went wrong.

author: james_s
author_rank: Super Contributor
timestamp: May 25, 2017, 07:00:45 pm
content: Anybody know if there's a way to dump the NVRAM contents of a TDS340A over GPIB as can be done with the TDS500/700 series? I have an option 14 board in one now and I can control the scope but I haven't figured out how to read the RAM if that's possible. This one passes all the self tests without errors so I'd like to make sure I back up the DS1644 without losing the contents at which point I'll graft a new battery onto it.
Is this oscilloscope worth the price? - Page 1
Forum section: electronics / testgear

author: Greyersting
author_rank: Regular Contributor
timestamp: May 22, 2017, 10:21:51 pm
content: I found an oscilloscope online that is for sale near me. It is a Leader 8063.http://www.testequipmentdepot.com/leader/8063.htmIs this oscilloscope worth $105 used? Thank you

author: james_s
author_rank: Super Contributor
timestamp: May 22, 2017, 11:17:45 pm
content: Seems a bit steep for a modest bandwidth analog scope, I would think you could find something a bit nicer like a Tek 465B in that price range but that depends on the local market. You might offer the seller $50 and see what they say.What do you need a scope for? That has some bearing on choice of instrument.

author: xrunner
author_rank: Super Contributor
timestamp: May 22, 2017, 11:23:58 pm
content: Quote from: Greyersting on May 22, 2017, 10:21:51 pmThere's one on Ebay now for $69 + $12 shipping = $81Most other 60 MHz class scopes go for $50 - $60.

author: P90
author_rank: Frequent Contributor
timestamp: May 22, 2017, 11:39:39 pm
content: what's up with the 3 channels? a bit unusual ;(

author: james_s
author_rank: Super Contributor
timestamp: May 23, 2017, 12:44:50 am
content: That is an oddity, but not really a big deal. Most analog scopes are only 2 channels.

author: P90
author_rank: Frequent Contributor
timestamp: May 23, 2017, 12:50:26 am
content: BTW, you can find a nice older 60-100MHz analog oscilloscope for $50-100, Hitachi, Hameg, Tek, etc...

author: David Hess
author_rank: Super Contributor
timestamp: May 23, 2017, 12:55:23 am
content: The external trigger input probably operates as a limited 3rd channel.If the oscilloscope works and you can find documentation then that price would be reasonable.
Cmu200 input power options - Page 1
Forum section: electronics / testgear

author: tech255
author_rank: Contributor
timestamp: May 22, 2017, 07:06:40 pm
content: Having purchased a rhode&schwarz cmu 200 i was dismayed to learn it has a limit of 2w input on both inputs 1 and 2.I only have the cmu99 installed although a cmu95 is available at reasonable cost can someone tell me what i need to add or remove to lift the input to 50w.
Vertical position problem scope HP1740A - Page 1
Forum section: electronics / testgear

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: May 14, 2014, 02:27:51 am
content: I bought an old scope HP 1740A but with a vertical position problem,and thought it was the big hibryd vertical out,wasn't the chip but two resistors named R1,R5, that receives the signal from delay line 100ns,they are 1.2k,on DMM measure was 1.9k.Same problem i found in other forum:http://www.electro-tech-online.com/attachments/aaesp07-gif.44411/This looks like a classical failure in these oscilloscopes.

author: tautech
author_rank: Super Contributor
timestamp: May 14, 2014, 03:04:41 am
content: Thanks for posting your thread here.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: May 14, 2014, 03:09:26 am
content: Quote from: tautech on May 14, 2014, 03:04:41 amis always a pleasure to help friends!

author: lowimpedance
author_rank: Super Contributor
timestamp: May 14, 2014, 03:17:58 am
content: I have also had found R3 can drift high and basically shift the DC bias through out the preceding hybrid making it appear dead, ie signal at input but nothing on the CRT. Having played a bit with these vintage HP CRO's I have found the Hybrids to be reliable and less likely to be the cause of trouble compared to the more generic parts around them etc.Edit: I mentioned this quite some time ago in the restoration of a 1741 thread by Tekfan.Quite a deal of info there if you wish to search

author: ddelectrical
author_rank: Contributor
timestamp: May 21, 2017, 08:59:33 pm
content: Just repaired a hp1740a with no trace. A5Q1 open circuit. Replaced A5Q1 and A5Q3 as a pair and alls well. No bad resistors in this one. Used 2N3906 pnp.
Fluke 8050A any good? - Page 1
Forum section: electronics / testgear

author: garymck
author_rank: Contributor
timestamp: May 18, 2017, 04:55:53 am
content: Hi,I have an old Fluke 8050A benchtop multimeter I was given a couple of years ago. Now that I've become really interested in electronics I was wondering whether this is a good unit, or should I replace it with a newer model? Have managed to download a manual.cheersGary

author: tautech
author_rank: Super Contributor
timestamp: May 18, 2017, 05:19:31 am
content: This thread is worth reading:https://www.eevblog.com/forum/testgear/old-fluke-multimeters/

author: amspire
author_rank: Super Contributor
timestamp: May 18, 2017, 06:09:29 am
content: It is a great unit. Keeps its calibration extremely well and a good RMS AC volts.Because of its age, protection is not to the same standard as modern multimeters, but for low voltage bench work, it is excellent.

author: garymck
author_rank: Contributor
timestamp: May 18, 2017, 06:35:59 am
content: Thanks....I'll keep it - not to interested in mains voltage stuf at the moment....way too little knowledge for thatcheersGary

author: Fungus
author_rank: Super Contributor
timestamp: May 18, 2017, 07:57:00 am
content: You should definitely mail it to me and get something newer for yourself. Better safe than sorry.

author: Electro Detective
author_rank: Super Contributor
timestamp: May 21, 2017, 09:26:54 am
content: Quote from: Fungus on May 18, 2017, 07:57:00 amIf it bounces back for some reason, OP can send it to me
Fluke 80T-150 Temp Probe - Page 1
Forum section: electronics / testgear

author: DanielSpokane
author_rank: Regular Contributor
timestamp: May 21, 2017, 02:40:41 pm
content: Any one have a manual for the Fluke temperature probe. I have the original model (80T-150), not the newer 80T-150UA model. See picture below. Need to calibrate and can't find the manual online. Anyone have the manual they can share with me?Thanks!

author: retiredcaps
author_rank: Super Contributor
timestamp: May 21, 2017, 04:22:20 pm
content: Bama. Page 5.http://bama.edebris.com/manuals/fluke/80t150/PS. I had no problem using "80t-150 service manual" for my search criteria.

author: DanielSpokane
author_rank: Regular Contributor
timestamp: May 21, 2017, 06:09:10 pm
content: Thank you!For what its worth I searched for "Fluke 80T-150 manual"... and could only find the 80T-150UA manual. Looks like i should have used "service manual"... or maybe im just retarded and missed it. Regardless, thanks man. This forum rocks!!
Keysight Benchtop DMMs 15% OFF, when? - Page 1
Forum section: electronics / testgear

author: petreza
author_rank: Contributor
timestamp: May 18, 2017, 04:54:54 pm
content: Keysight had a 15% off sale on bench-top DMMs that ended December 31 (I think).Does this sale come up throughout the year or do I have to wait for the holiday season?Thanks!
Hantek DSO5102B. Need firmware. Output of measurement results. - Page 1
Forum section: electronics / testgear

author: shurup
author_rank: Newbie
timestamp: May 19, 2017, 05:22:14 pm
content: Hello.DSO5102Bsw version: 2.06.3 (140211.0)hw version: 10070x555583edNeed firmware, which allows you to display a table with the results of measurements. Like on a picture.Thanks!
How do you go about testing probe bandwidth? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: May 17, 2017, 02:25:31 pm
content: What I have been doing is using the fast edge output on a Rigol DS4014 which when connected to the scope with a 50 ohm terminated cable measures 740-780ps for the rise time / fall time. When I try to connect a probe to the fast edge output, I usually 50 ohm pass through terminate it there and then use a BNC adapter on the probe to try to look at the rise/fall time, but sometimes it isn't quite right. I'll have lower bandwidth probes have just as strong a rise/fall angle, but they typically ring a bit more at the end of it. Sometimes that ringing will throw off the calculated rise/fall measurement on the scope and report a lower bandwdith probe as having a faster rise/fall than a higher one. How do you measure probe performance? Any ideas?

author: nctnico
author_rank: Super Contributor
timestamp: May 17, 2017, 02:36:25 pm
content: AFAIK probe performance is measured from a source with a 25 Ohm output impedance.

author: TimFox
author_rank: Super Contributor
timestamp: May 17, 2017, 03:58:58 pm
content: Yes: 25 ohms is the equivalent resistance from a 50-ohm source terminated in a 50-ohm load, as described above. Note that a good probe (e.g., Tek TPP01000) has 3.9 pF input capacitance, which gives a time constant of roughly 100 ps with a 25 ohm source. That would give a rise time of 215 ps, or a bandwidth of 1.6 GHz, with a perfect oscilloscope.

author: alank2
author_rank: Super Contributor
timestamp: May 17, 2017, 05:13:29 pm
content: Hi Tim - please post the formulas for calculating these values if you don't mind!

author: nctnico
author_rank: Super Contributor
timestamp: May 17, 2017, 05:49:06 pm
content: tr=3*RC -> 3.9p * 25s=97.5psBut don't get your hopes up you can actually achieve this bandwidth and/or get good signal fidelity with such a probe. Signal loading and grounding will cause issues.

author: David Hess
author_rank: Super Contributor
timestamp: May 17, 2017, 07:57:48 pm
content: Quote from: alank2 on May 17, 2017, 02:25:31 pmThat is the way to do it and it works up to at least 300MHz but at higher frequencies, a special BNC to probe tip adapter or test fixture is used which has the 50 ohm feedthrough termination built in.The Rigol DS4014 test signal is unlikely to be clean enough anyway. Dedicated reference level pulse generators are used for this.

author: alank2
author_rank: Super Contributor
timestamp: May 17, 2017, 08:51:24 pm
content: Quote from: David Hess on May 17, 2017, 07:57:48 pmI'm sure you are right, the manual says it is a 500ps edge. It is the best I have though!!

author: TimFox
author_rank: Super Contributor
timestamp: May 17, 2017, 09:40:35 pm
content: (Rise time) = (ln 0.9/0.1) x (time constant) = 2.2 x (time constant), where rise time is from 10% to 90% of full rise.BW = 0.35 / (rise time) = 1 / (2 x pi x time constant).These formulas are correct for a single pole response, and approximately right for oscilloscope applications.
Search: Rotary encoder knobs used in Keysight InviniiVision Scopes ... - Page 1
Forum section: electronics / testgear

author: _Harry_
author_rank: Contributor
timestamp: May 17, 2017, 07:27:42 pm
content: maybe here in that forum section is anyone who can help ...https://www.eevblog.com/forum/repair/search-rotary-encoder-knobs-used-in-keysight-inviniivision-scopes/

author: carl_lab
author_rank: Frequent Contributor
timestamp: May 17, 2017, 07:39:55 pm
content: https://www.eevblog.com/forum/repair/search-rotary-encoder-knobs-used-in-keysight-inviniivision-scopes/msg1211198/#msg1211198
Keithley 2000 problem - reeding keeps incrementing (or dec.) - Page 1
Forum section: electronics / testgear

author: hellzakk
author_rank: Contributor
timestamp: May 17, 2017, 02:47:39 pm
content: Hi all, it's just arrived my last ebay purchase a keithley 2000 (with scan card) but it have a strange behavior.After the power on it start fine but in DCV if i set the range from 100V down to 10V,1V or 100mV the readings keep incrementing (even with no leads) to overflow after some time.I've removed the scan card but the problem remain the same.Any hint?

author: Wytnucls
author_rank: Super Contributor
timestamp: May 17, 2017, 03:15:52 pm
content: Don't worry about it.It's normal.

author: hellzakk
author_rank: Contributor
timestamp: May 17, 2017, 03:23:47 pm
content: what you mean? it must stay near the zero value... i cant read any voltage this way...

author: TiN
author_rank: Super Contributor
timestamp: May 17, 2017, 03:28:10 pm
content: Now, your statement have the correct answer in it. Here's one more hint : what voltage exactly are you trying to read this way?P.S. Before new members advocates popup, try to search for this condition, almost every month there is a thread about "woa, my readings going up, my meter is broken?"

author: mimmus78
author_rank: Unknown
timestamp: May 17, 2017, 03:31:59 pm
content: It's normal. I think this question was unswared 100 times here. Impedance at 10V range is pretty high, so the integrator cap keeps changing. If set the 100V range, impedance drop to M ohm range and you will get what is your? expected behaviour.Inviato dal mio Nexus 6P utilizzando Tapatalk

author: PTR_1275
author_rank: Frequent Contributor
timestamp: May 17, 2017, 03:34:51 pm
content: If you think it's broken, I'll happily buy it off you cheap.However, take the input leads and short them together. The reading should be stable and very close to 0 voltsNow un-short the input leads and manually increase the input range of the meter. It should be mounting around until you get to the 100v range (or maybe 10v range, I can't remember). Have a look at the input impedances for the ranges (in the user manual) and see what you find.

author: hellzakk
author_rank: Contributor
timestamp: May 17, 2017, 03:37:25 pm
content: ok thank you all for the explanations, i can confirm its working good
Calibration required? - Page 1
Forum section: electronics / testgear

author: PowerNet
author_rank: Regular Contributor
timestamp: May 17, 2017, 01:06:15 am
content: Hi all,So I found some oz websites offering calibrations when purchasing some of their multimeters.Question is are these all necessary ? I thought brands like Fluke are pretty accurate.I know some companies require all your multimeters to be calibrated.Any ideas ?Thanks

author: P90
author_rank: Frequent Contributor
timestamp: May 17, 2017, 01:11:18 am
content: for personal use you don't need it. certification is for industries that require traceability

author: xrunner
author_rank: Super Contributor
timestamp: May 17, 2017, 01:12:38 am
content: Quote from: PowerNet on May 17, 2017, 01:06:15 amAre you talking used DMMs? If they are used perhaps ... new, no they should not need a cal at all. If you are working for someone that requires you to use a DMM in cal (certified), then you have no choice.Hobbyist, then I wouldn't do it unless you see a gross error, otherwise it's up to you.

author: PowerNet
author_rank: Regular Contributor
timestamp: May 17, 2017, 01:16:37 am
content: Yeh just as what I thought.This site wants $100+ to calibrate it and provide a certificate.Safe to say Flukes are accurate enough from the factory.Thanks.

author: james_s
author_rank: Super Contributor
timestamp: May 17, 2017, 05:48:20 am
content: Calibration certificates are not about accuracy, they're about a paper trail certifying that the accuracy is what it says it is.

author: CJay
author_rank: Super Contributor
timestamp: May 17, 2017, 01:15:27 pm
content: Necessary in lots of places if you're doing commercial work, nice to have if you buy a second hand one (even if it's just a recently expired cal cert in the box) but not essential, my Fluke 77 has been abused (slipped while probing about in a vintage CRO and smoked it with a couple of KV), repaired and hasn't been calibrated in 20 years yet it's still accurate enough for my needs compared with my TTi bench meter and a Fluke 179.I got myself one of the AD584 'voltage references' from eBay so I can sanity check them occasionally, of course there's no guarantee the AD584 is stable or accurate but I reckon that as long as the meters agree with each other then I can reasonably trust them for the non critical stuff I do...
Spikes in Rigol DG1022 ARB-waveforms. - Page 1
Forum section: electronics / testgear

author: teemum
author_rank: Newbie
timestamp: May 14, 2017, 03:39:29 pm
content: I have been trying to create some waveforms with Rigol DG1022 and Ultrawave -software.Now I noticed that for some reason the device sends a small spike between the cycles of the created wave.For example if I create a 1kHz sinewave with Ultrawave and download it to the device, there is a spike seen in the first attached picture. In the second picture the spike is zoomed. I have created a one cycle of the 1kHz wave with 4096 datapoints with the Ultrawave. If I save the data to .txt -file and look it with the notepad, I cannot see such spike in the data.Has anyone seen this problem before?

author: teemum
author_rank: Newbie
timestamp: May 14, 2017, 05:21:54 pm
content: It seems that if I download the waveform to DG1022 and then upload it back to the Ultrawave, I can see the spike also in Ultrawave at the begining of the waveform.

author: teemum
author_rank: Newbie
timestamp: May 16, 2017, 04:56:45 pm
content: It seems the spike is bigger if I create one cycle of 1kHz sine than if I create 1MHz sine.Also if I create a DC-voltage of 1kHz waveform that has only 5 points in it, the whole waveform is totally corrupted.Can anybody test if they have this problem with DG1022?

author: egonotto
author_rank: Super Contributor
timestamp: May 17, 2017, 06:37:35 am
content: Hallo,I tryed it with my DG1022 and i can not see spikes.Perhaps you can attach your file that i can save to may DG1022 to check this.Best Regardsegonotto
Update Metrahit SI232 Adapter to SI232II possible ? - Page 1
Forum section: electronics / testgear

author: giovannirat
author_rank: Regular Contributor
timestamp: January 09, 2016, 05:35:12 pm
content: I bought a Metrahit SI232 Adapter for my Metrahit Multimeters recently.Unfortunately the SI232 Adapter is only unidirectional (data transfer), the newer SI232II is bidirectional.The PCB's of the adapters (SI232 and SI232II) look very similar in design (the only visible difference is the missing IR-LED on the SI232 adapter).Is there any possibility to upgrade a SI232 to a bidirectional SI232II ?Any information welcome..Thanks

author: coromonadalix
author_rank: Super Contributor
timestamp: April 26, 2017, 10:44:45 pm
content: you have to add the transmit TX ir led, it must be a fast model ... or the led has been removed ?? we see the led on one picture, and not on the others

author: coromonadalix
author_rank: Super Contributor
timestamp: May 08, 2017, 01:46:27 am
content: Justa managed to get one today at a ridiculous price, i will open it to check if it is like yours and report back

author: giovannirat
author_rank: Regular Contributor
timestamp: May 08, 2017, 07:04:52 am
content: Hi coromonadalix,thank you very much for your feedback.But I wrote an email to Gossen Metrawatt service and they told me, that an upgrade is not possible, because the difference is not only the missing IR-LED but also a partly different firmware....

author: coromonadalix
author_rank: Super Contributor
timestamp: May 08, 2017, 10:22:01 am
content: Damn just saw ... mine is the SI 232 II "the bidirectional", when i'll receive mine, i will check the cpu on the board and report back ...

author: coromonadalix
author_rank: Super Contributor
timestamp: May 08, 2017, 10:34:11 am
content: I saw on Ebayaz some db232 models, but i suspect frauds, since they are only taking western union payments, no refund seem's possiblehttp://www.ebayaz.com/gossenmetrawatt-gtz3242100r0001-interface-adapter-for-metrahit-multimeters-p-19487.htmlwith an 997 items stock left ??the price was 22,24 $usd a piece, but found two other prices 143$ and 158$? very strange i've supposedly bought 2 of them at 22,24 each, but i have chills to pay ...The price seems to be back at 143$ ??Sent an email wanting to have proof with an email written under it ...You can check too this one too :http://www.ebayusshop.com/electrical-accessories-c-835_844_845/gossenmetrawatt-gtz3242100r0001-interface-adapter-for-metrahit-multimeters-p-26436.htmlThey are the cheapest prices i could find on the web.In the Gossen Meters, they used hitachi otp cpus, i think it is the case with the SI232 II ??Maybe it could be possible to copy them, there is a cpu mode and a memory mode.But the adapter alone for my Elnec programmer is 200$, and removing a 100 pins qfp chip without the right airflow socket will be no easy job ..

author: coromonadalix
author_rank: Super Contributor
timestamp: May 17, 2017, 03:03:19 am
content: I received my SI232II today, its an otp cpu, i wont be able to dump it without specials adapters, who cost a fortune .... sorryUnless you find a BD232 or an SI232IIyou're out of luck ...
Telequipment D61A x-y operation? - Page 1
Forum section: electronics / testgear

author: OleST
author_rank: Newbie
timestamp: May 15, 2017, 12:48:02 pm
content: Hello, i have an old Telequipment D61A oscilloscope wich i want to set up to display oscilloscope music but im unsure if my scope even supports x-y operation, do any of you know if it does?

author: JFJ
author_rank: Regular Contributor
timestamp: May 15, 2017, 01:11:53 pm
content: Your oscilloscope does support x-y operation. Setting the 'time/div' knob to 'ch2' turns channel 2 into the X input.

author: OleST
author_rank: Newbie
timestamp: May 15, 2017, 01:22:00 pm
content: ok, thanks!

author: Macbeth
author_rank: Super Contributor
timestamp: May 15, 2017, 02:04:50 pm
content: If I remember, there is also a Z input at the back for blanking.

author: tautech
author_rank: Super Contributor
timestamp: May 15, 2017, 08:25:30 pm
content: Quote from: OleST on May 15, 2017, 01:22:00 pmThe manual for a D83 I had was the user and service manual, here's a link to the D61A manual.http://www.ko4bb.com/getsimple/index.php?id=download&file=06_Misc_Test_Equipment/Telequipment/Telequipment_D61A_Operations_Service_Manual.pdf

author: OleST
author_rank: Newbie
timestamp: May 16, 2017, 06:15:39 am
content: thanks for the manual, i got this working yesterday so now i have the power to display mushrooms at will!this scope will most likely just be used for silly experiments tho, 10mhz is pretty limiting when im poking about with ham radios and such :/
Knob of Keysight U1242C is quite tight, normal? - Page 1
Forum section: electronics / testgear

author: onemilimeter
author_rank: Frequent Contributor
timestamp: May 15, 2017, 04:07:07 am
content: Hi...Just received my Keysight U1232A and U1242C. The U1232A knob is OK and when it is turned from one position to another I can feel/hear the "click-click or tick-tick" sound. However, the U1242C knob is quite tight and unusual and when it is turned from one position to another there is no (little) "click-click or tick-tick" sound/feeling, it's like being "dragged" from one position to another.Is this normal? Does your U1242C also behave like this?Thanks

author: Jon.C
author_rank: Unknown
timestamp: May 15, 2017, 05:14:28 am
content: minute 34

author: onemilimeter
author_rank: Frequent Contributor
timestamp: May 15, 2017, 06:03:37 am
content: 22s ~ 28s ... when the Keysight guy turned the knob, the "click" sound was is a bit "dull" and it was not as clear "click" as the U1242B.. very similar to my unit..Is it because the meter it's designed to meet IP-67 (water protection or water resistant)?
GW GDM8251A Firmware update. - Page 1
Forum section: electronics / testgear

author: whitevamp
author_rank: Regular Contributor
timestamp: May 13, 2017, 03:09:24 pm
content: so I just got my new/fleabay find GDM8251A and i looked at the firmware ver. and it said it was ver 2.11, and i see on the GW site that the newest one is 6.7 so i thought i would update it. and i was reading the update procedures for it and it was talking about using a null modem cable and nothing about using the USB, to do the update.so my question is can i use the usb to do the update? instead of the null modem cable.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 14, 2017, 03:31:35 am
content: http://59.120.26.36/en/download/downloadfilelist.aspx?id=196last line is : Firmware Update Program & Procedure and a download link

author: whitevamp
author_rank: Regular Contributor
timestamp: May 14, 2017, 03:43:00 am
content: thanks for this, and it dose look like i need the null modem cable.all ready have the cal key.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 14, 2017, 04:44:28 am
content: 6.7 is the version of the Windows Serial Downloader program, which is what actually connects to the meter and installs the firmware. The newest firmware is version 2.30, which is what the 6.7 WSD program should try to install.

author: whitevamp
author_rank: Regular Contributor
timestamp: May 14, 2017, 05:07:13 am
content: Quote from: CustomEngineerer on May 14, 2017, 04:44:28 amok thx.still newer then the 2.11ver i have.
DSO138 DIY Kits - Page 1
Forum section: electronics / testgear

author: OpenCircuit
author_rank: Regular Contributor
timestamp: March 25, 2017, 03:30:21 am
content: Forgot I had this in my soldering box. Put it together a year or two ago, but it doesn't work. The screen lights up (backlight only), but it doesn't show anything on the screen. Anyone know anything about these?

author: TNorthover
author_rank: Contributor
timestamp: March 25, 2017, 03:52:18 am
content: Quote from: OpenCircuit on March 25, 2017, 03:30:21 amThe instructions have a bunch of troubleshooting tips, have you tried those yet?

author: Gyro
author_rank: Super Contributor
timestamp: March 25, 2017, 10:11:11 am
content: Try JYE's DSO138 Forum...http://www.jyetech.com/forum/viewforum.php?f=18&sid=f7b11da47f69d3b4c26a35306f5d1741

author: OpenCircuit
author_rank: Regular Contributor
timestamp: April 29, 2017, 02:59:48 am
content: JYE Tech took care of me. Went back and forth in emails probing and they eventually sent me a new board. They concluded a short while I agreed. New kit turned out fine.Short was gone after cleaning J4 solder, so it had to be post J4. I pulled NEARLY everything and the short was still present until I removed the MCU.*Considering wasting a few dollars on a new MCU just to see if I am right or not.Then I would need to flash the chip....*EDIT:Interesting they are even checking for this:1.https://www.youtube.com/watch?v=Nl-mDqMHoKw&feature=youtu.be2.http://www.jyetech.com/Products/LcdScope/e138.php

author: OpenCircuit
author_rank: Regular Contributor
timestamp: May 13, 2017, 11:30:57 pm
content: ....
how to fix Fluke 116 cal err calibration error?? - Page 1
Forum section: electronics / testgear

author: dw8000
author_rank: Contributor
timestamp: May 13, 2017, 07:46:45 pm
content: The fluke manual desc "Calibration required. Meter calibration is required before the Meter will operate"Is there anything the end user can do to resolve this error without sending it to a test facility?thanksdw

author: retiredcaps
author_rank: Super Contributor
timestamp: May 13, 2017, 07:49:15 pm
content: It needs to be sent back to Fluke for this type of error as far as I know.
Fluke 335A DC Voltage Standard/Differential Voltmeter/Null Detector - Page 1
Forum section: electronics / testgear

author: Cubdriver
author_rank: Unknown
timestamp: May 13, 2017, 05:52:08 am
content: I pulled the 335A from the 7105A Calibration System I picked up last weekend, started looking it over and have gotten some pictures. I'm not sure of the vintage, as I lack a Fluke s/n decoder ring, and component date codes on the various boards range from the mid 70s through the mid 80s, with some from the late 70s thrown in for variety. Its serial number is 28022 in case anyone knows a way to guesstimate a production year from that. My guess is that it was repaired over the years, and some newer boards were installed at various times - one of the units in the 7105A stack has a Fluke Technical Center calibration tag on it from Oct. 1984.Anyway - enough yipping - on to pictures.Front panel:Rear panel:Top with calibration access cover removed:Chassis with outer cover removed (the white plastic spacers ensure separation from the inside of the outer enclosure - the chassis may be as high as 1100V above ground potential during operation.):Chassis with internal cover removed:More photos (including commentary and some if the individual boards) may be found at:https://pmanning.smugmug.com/Electronics/Fluke-335A-DC-Voltage-Standard-Differential-Voltmeter-Null-Pat
This looks like it could be a fun piece of hardware - Page 1
Forum section: electronics / testgear

author: tablatronix
author_rank: Regular Contributor
timestamp: May 12, 2017, 06:54:10 pm
content: monitor oscilloscope?I can imagine some fun hacks with this.http://www.ebay.com/itm/Oscilloscope-7-discrete-channels-screens-/272667918115?hash=item3f7c463f23:g:0CYAAOSwol5Y2ve9

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 13, 2017, 12:40:13 am
content: Such as?

author: xrunner
author_rank: Super Contributor
timestamp: May 13, 2017, 12:47:18 am
content: What do you think the "REC" and "REP" channel labels mean?

author: ebastler
author_rank: Super Contributor
timestamp: May 13, 2017, 05:59:08 am
content: Quote from: xrunner on May 13, 2017, 12:47:18 am"Record" and "Replay"?This brief company portrait describes Data Check Corp as a vendor of video monitoring equipment. It also mentions that HP and Tktronix apparently had similar 7-channel scopes at a time:https://www.digitalbroadcasting.com/doc/data-check-corp-0001

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 13, 2017, 08:04:10 am
content: That unit screams "scope clock"
TDS300 hack: TDS340A/360/380 and TDS310/320/350 firmware images needed - Page 1
Forum section: electronics / testgear

author: corn11
author_rank: Regular Contributor
timestamp: January 24, 2017, 02:07:48 pm
content: Hi everyone,I've recently pulled a TDS320 (FW V2.0.1) out of a dumpster just suffering from a front panel issue.While tracking down the issue with the service manual of the TDS340A/360/380 (there is only a parts list for the TDS310/320/350 available) I've discovered that the parts and probably the mainboards of the TDS320/350 and the TDS340A/360 scopes are nearly identical except for some R/L/C values, one cfb amplifier and the NVRAM (DS1230 <-> DS1644) which could also be compatible except for the RTC by the first look.The newer TDS340A/360/380 series scopes offer some additional features like FFT and storage functionalities.My plan is to flash the firmware of a TDS340A/360/380 on my TDS320 and add the tek floppy drive controller (If I can get hold of one / I think it should also work without one and just throw an error) and add an USB port to the back via a floppy to USB adapter.I think it should also be possible to turn the scope into the 200 MHz TDS360 model by replacing some inductors and resistors similar to the TDS500/700 hack.I haven't tried to download the current firmware via the tektool yet but I'm planning to do that within the next couple of days (if it works?).My current problem is that I'vent found a TDS340A/360/380 firmware image yet despite a TDS310/320/350 image to be able to compare it to the extracted one.It would be great if someone here can help me out with a suitable firmware image ?Thank you in advance !

author: hexpope
author_rank: Contributor
timestamp: May 11, 2017, 12:36:04 pm
content: Did you get anywhere with what you were posting about ? I have a TDS340A here in the lab ATM...

author: james_s
author_rank: Super Contributor
timestamp: May 11, 2017, 08:43:32 pm
content: I have a TDS340 currently and another TDS340A on the way, sold the last one I had. The one that's coming is the only one I've had with option 14 which adds GPIB so if there's a way to dump the firmware via that I'd be happy to do so. It would be fun to try to hack one of these instruments, they're definitely a low cost design but still quite usable. Internally they remind me a lot of the Mac Classic, it had a half sized motherboard inside the same size case as the older Plus. The TDS300 is in the same case as the TDS400 series but instead of 5 boards it has one.

author: andy2000
author_rank: Frequent Contributor
timestamp: May 12, 2017, 02:49:35 pm
content: Are you sure the firmware is the difference? Has anyone looked for option jumper resistors like on the the TDS 700 series?
Fluke 233 Tilt Stand - Page 1
Forum section: electronics / testgear

author: ka7gzr
author_rank: Contributor
timestamp: May 07, 2017, 09:22:02 pm
content: Hello All!I got a used Fluke 233. Its at Fluke for a firmware update and calibration. It is missing the "Tilt Stand". Fluke is no help unless I have a part number. Does anyone know what the P/N is for the 233 tilt stand or can sell me one new or used?TIA,Jim

author: Macbeth
author_rank: Super Contributor
timestamp: May 07, 2017, 09:48:58 pm
content: Perhaps search the Fluke parts website for "bail" or "tilting bail" - I know that's what Dave calls 'emThough it's pretty shit when customer service expects you to do their job for them.Quite unbelievable when you send it in to them for update and cal!

author: Electro Detective
author_rank: Super Contributor
timestamp: May 08, 2017, 11:02:45 am
content: SaysCAV 1on my Fluke 233 'tilt stand'and >PC/ABS< which must be some plastics batch ID ?I checked for the part in the user and calibration manuals, there is a brief mention of it and its use,but zero part number or info on it, perhaps it's part of that rear integral assembly,or are 'Under New Management' at Fluke falling asleep at the wheel ?Good luck with the hunt

author: kasone
author_rank: Contributor
timestamp: May 11, 2017, 01:20:01 pm
content: The Fluke 233 calibration information manual on page 19 has a parts list of replaceable parts and page 20 has a diagram showing the parts. Reference MP21 is the bottom cover Fluke PN:3383737.The parts list is at:http://media.fluke.com/documents/233_____cieng0000.pdfIt appears that the tilt stand is part of the bottom cover.

author: ka7gzr
author_rank: Contributor
timestamp: May 12, 2017, 05:00:40 am
content: Thanks Kasone- I have reached the same conclusion. Its an integral part of the back case of the "body"

author: ka7gzr
author_rank: Contributor
timestamp: May 12, 2017, 05:13:51 am
content: This all has reached a "Happy Ending".I sent my Fluke F-233 to Fluke service for a firmware update and calibration. Also I was searching for a back tilt stand which was missing. Fluke service noticed that one of my battery clips in the display unit had partially separated from the display unit PCB. Because of this, the PCB was damaged and Fluke service deemed it not repairable. It was still under warranty so I was sent a new F-233.Thanks Fluke for this great customer support!!!Jim

author: kasone
author_rank: Contributor
timestamp: May 12, 2017, 11:13:26 am
content: I have had the same experience with Fluke on a model 177 meter. Fluke has great customer support and their reps are very helpful.
Problems Transferring Setup from PC to Rigol DS2072A via NI.VISA - Page 1
Forum section: electronics / testgear

author: iBeta
author_rank: Newbie
timestamp: May 11, 2017, 04:49:31 pm
content: I'm using c# .net to communicate with the DSO using NationalInstruments.VisaNS.MessageBasedSession. So far have been able to upload Event Tables from the DSO to pc ok.The attachment shows the :SYSTem:SETup Command. I can save the DSO Configuration data to the PC, but not back again to the DSO - nothing happens.Code:string loadCommand = ":SYSTem:SETup?";mbSession.Write(loadCommand);mbSession.ReadToFile("D:\\DSOSetupRTF.stp"); /Code:loadCommand = ":SYSTem:SETup ";mbSession.Write(loadCommand);mbSession.WriteFromFile("D:\\DSOSetupRTF.stp");I've tried other methods to write, ie WriteBytes(n) but no luck. Maybe I should write to Rigol, but no sure if they will help with something like this.