hybridfree/eevblog-posts huggingface dataset:
EEVBlog BM235 pulled from Amazon  - Page 1
Forum section: electronics / testgear

author: h_p
author_rank: Unknown
timestamp: May 12, 2017, 01:15:44 am
content: Today I was looking up the BM235 on Amazon for a friend when I noted the listing was gone. Does this mean the 121GW is being released soon?!? If so I'm super excited for it.

author: TheSteve
author_rank: Unknown
timestamp: May 12, 2017, 01:35:38 am
content: Quote from: h_p on May 12, 2017, 01:15:44 amIn the past when this has occurred it is because they were out of stock.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 12, 2017, 01:57:12 am
content: Quote from: h_p on May 12, 2017, 01:15:44 amThe 121GW is not a replacement for the BM235, it's a higher range model that will be sold in addition to the BM235.

author: h_p
author_rank: Unknown
timestamp: May 12, 2017, 02:27:50 am
content: Why wouldn't he just leave the listing up and have a will be in stock this date notice like every other product on Amazon that runs out of stock?!? Did Dave say he was going to sell them concurrently. From reading the supporter thread here about it and watching all the videos I got the impression that he wasn't going to be selling both.

author: Testing123
author_rank: Contributor
timestamp: May 12, 2017, 11:27:34 am
content: Quote from: h_p on May 12, 2017, 02:27:50 amI emphasized 'he' in the quote above to note that he (Dave) didn't do it, Amazon did.Here's a link where Dave says so:https://www.eevblog.com/forum/testgear/eevblog-bm235-multimeter-on-amazon-is-out-of-stock-and-maybe-gone/msg1060236/#msg1060236

author: h_p
author_rank: Unknown
timestamp: May 12, 2017, 11:43:21 am
content: Good to know. Odd. I wonder what criteria Amazon uses for this decision. I shop on Amazon A LOT and I've never seen a product page disappear when stock runs out.

author: Testing123
author_rank: Contributor
timestamp: May 13, 2017, 12:36:10 am
content: Quote from: h_p on May 12, 2017, 11:43:21 amGood question, and I agree, I've not seen that behavior on Amazon either (well, that I was cognizant of anyway :-)Maybe Dave knows... ?

author: SeanB
author_rank: Super Contributor
timestamp: May 13, 2017, 03:26:36 pm
content: Probably because there is long restock time, IIRC a few weeks, and Amazon would hide it so there is no back ordering for it, as the customers are used to next day delivery on all items.Here we are getting used to same year delivery.
Racal Dana 5001... Calibration details? - Page 1
Forum section: electronics / testgear

author: member_of_eevblog
author_rank: Newbie
timestamp: May 02, 2015, 01:36:08 pm
content: Hi,Can anyone pass along link to Racal Dana 5001 schematic/manual?'Picked up a faulty Racal Dana 5001 four-wire multimeter yesterday for $5.Searching EEVBLOG yielded one similar request from 2013 and no links the schematic information.All help is appreciated.Thanks.LouisGood News Update:As luck would have it, after finding and replacing a faulty LM339 it now works (slightly out of calibration).Does anyone have calibration information they can pass along?Thanks,LouisP.S. Could still use schematics for future reference.

author: wn1fju
author_rank: Frequent Contributor
timestamp: May 02, 2015, 03:03:29 pm
content: artekmanuals.com has the download for $12.50. Search the "other manuals" category on the page.

author: member_of_eevblog
author_rank: Newbie
timestamp: May 02, 2015, 03:43:51 pm
content: Thanks.Ultimately purchasing the information may be the only way.Hopefully someone will help with free download (to keep from paying 3 times the hardware cost for the schematic)

author: member_of_eevblog
author_rank: Newbie
timestamp: May 04, 2015, 06:00:16 pm
content: As it turned out calibration discrepancies were a matter of giving it some time to warm up. It seems to be working fine.Still no documentation though.For anyone interested, the method used to find the bad IC was to simply look for unusual levels.About the third IC probed yielded some 2 volt outputs on a comparator. Easy change since this is fully populated with sockets!

author: rsjsouza
author_rank: Super Contributor
timestamp: May 09, 2017, 07:29:59 pm
content: Sorry for digging up an ancient thread, but if someone is looking for the Service Manual for this meter, please visit KO4BB's excellent site at:http://www.ko4bb.com/getsimple/index.php?id=manuals

author: mmagin
author_rank: Frequent Contributor
timestamp: May 09, 2017, 08:27:54 pm
content: I have one of these. My experience is that it's a lot more drifty with temperature than something like a HP 3478A. Probably because it's just a single-slope converter, if I recall correctly.Still, it's decently accurate once warmed up and I love the easy to read display so it remains a favorite for me.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 09, 2017, 09:42:27 pm
content: I have one of these as well... It certainly requires a good warm up before taking any serious measurements but it is a good meter. I like Red LED displays as well.
Need help from Tektronix A6907 / A6909 owner or user - Page 1
Forum section: electronics / testgear

author: BravoV
author_rank: Super Contributor
timestamp: May 03, 2017, 05:32:58 pm
content: Anyone here own, use or have access to Tektronix A6907 or A6909 ?Much appreciated if you could do me a favor , which are :- Take a close up shots on the probe's connector body and the inner too, as its proprietary, preferably shot with measurements with caliper. (like length of the connector body, outer diameter, inner diameter, center pin and etc)- Close up shots at the connector at the unit it self where this probe is connected, ditto with measurements.- Those probes, all have that white box thingy, what is that ? Are they sort of a circuit box where the cable is connected inside ? Or just like snap-in ferrite that is galvanically isolated to the probe's cable ?Attached below example photo of the Tek probes with few highlights on the questioned spots.As this is not a BNC like ordinary scope's probe, does anyone have any idea what this connector is known as ?Thanks in advance for all the troubles.

author: BravoV
author_rank: Super Contributor
timestamp: May 07, 2017, 02:04:13 am
content: Bump .... anyone ?

author: amspire
author_rank: Super Contributor
timestamp: May 07, 2017, 02:15:08 am
content: It is a balun to help with common mode high voltage slew rates at the tip.

author: BravoV
author_rank: Super Contributor
timestamp: May 08, 2017, 02:25:55 pm
content: Quote from: amspire on May 07, 2017, 02:15:08 amRichard, I see, thank you. Do you own or ever used it ?

author: amspire
author_rank: Super Contributor
timestamp: May 08, 2017, 11:46:52 pm
content: Quote from: BravoV on May 08, 2017, 02:25:55 pmNo I haven't. It would be interesting to see how well it works. One of the common used of something like this is to look at the gate waveform of a high side switching mosfet. The problem there is you can have a voltage dV/dT slew rate compared to ground of the order of 10 billion volts per second. That would be a good test. I haven't looked at the specifications to see what it can cope with.

author: BravoV
author_rank: Super Contributor
timestamp: May 09, 2017, 01:09:28 am
content: Quote from: amspire on May 08, 2017, 11:46:52 pmAccording to it's spec, the max common mode slew rate 20KV/us.
Siglent SDM 3065X Usage Review and Meter Shootout on YouTube - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: May 09, 2017, 09:21:28 pm
content: Hi everyone, I have put a review of the SDM3065X on my channel, if you are interested it is shown below.https://youtu.be/k6HE8qV3CA4
Siglent SDP 3303X-E Triple Output Linear Power Supply Review - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: May 12, 2017, 12:04:05 am
content: Hi All,I have just uploaded my review of the Siglent SPD3303X-E triple output linear power supply, you can see it below.https://youtu.be/MwSO9cu5c1oRemember to subscribe whilst you are there :-)
Siglent SDG 1032X Usage Review on YouTube - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: May 09, 2017, 09:19:37 pm
content: Hi everyone, I have put a review of the SDG1032X on my channel, if you are interested it is shown below.https://youtu.be/XWAfreXt1g8
Register new equipment - Page 1
Forum section: electronics / testgear

author: Cicada
author_rank: Regular Contributor
timestamp: May 08, 2017, 09:39:45 am
content: HelloI have bought new T&M equipment from a couple of Original Equipment Manufacturers (such as Tektronix, Keithley, Keysight & Hameg) over the last 5 - 10 years. I have never bothered to "Register" any of the equipment with them, i.e. fill in the "Register your equipment" brochure that comes in the box with the equipment. I always rush on to using the equipment.I sit with a lot of these "Register your equipment" brochures of the equipment I have bought over the years. I wonder if there is any benefit in doing the registration now.Please educate me on the nuances of Equipment registration with the OEM'sThis post was modified. See my next post.Thank youCicada.

author: tautech
author_rank: Super Contributor
timestamp: May 08, 2017, 10:55:58 am
content: I'm fairly fussy about this and manage all Siglent sales records for Siglent in NZ but first and foremost receipts with model and SN# shown need to be kept as proof of purchase in the absence of warranty documentation.If the seller doesn't have these records and you don't either then it's likely you'll be SOL if you need support.

author: Cicada
author_rank: Regular Contributor
timestamp: May 08, 2017, 11:03:36 am
content: I must mention that all the equipment was not bought directly from the OEM companies but through distributors in South Africa.
Looking for bench PSU to replace 6632B - Page 1
Forum section: electronics / testgear

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 05, 2017, 04:15:08 pm
content: I'm doing some bench rearrangement, and my Agilent 6632B is taking up way too much space.What I mostly like about it is the low current display range, and ability to act as a load and simulate a battery.Apart from size and loud fan, the other thing that's annoying is that it only goes up to 20V.I'm not too bothered about the higher end of the current range, as I have other PSUs for that, and don't need low current indication.Main criteria are :Current display resolution down to at least 100uA, preferably lower.Ability to sink current if possible.No deeper then 420mm including mains cable.Taller is better than wider.Decent UIOutput up to 30V, 2A or soUsed or new. Cost not a big deal.Any recommendations ( including what to steer clear of) welcome.

author: Circuitous
author_rank: Unknown
timestamp: May 05, 2017, 04:32:41 pm
content: Quote from: mikeselectricstuff on May 05, 2017, 04:15:08 pmI think the Keithley 2280S fits your criteria, and I love my 2280s-32-6http://www.tek.com/tektronix-and-keithley-dc-power-supplies/keithley-2280s-seriesSent from my SM-G920P using Tapatalk

author: nctnico
author_rank: Super Contributor
timestamp: May 05, 2017, 04:46:00 pm
content: Did you look at Keysight's E36100 series?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 05, 2017, 05:24:07 pm
content: Quote from: Circuitous on May 05, 2017, 04:32:41 pmThanks - that looks good. From the datasheet it says it's able to sink a non-programamble current up to 0.45A, so presumably it can emulate a battery being charged from an external constant-current charge, but not, like he 6632B, act as a programmable load.Fortunately that would cover most of my requirements so looks promising.Wonder if Keithley want someone to review one..

author: Circuitous
author_rank: Unknown
timestamp: May 07, 2017, 02:13:54 am
content: Here's a fairly lame video reivew of it.And, another one showing the high spped capture and graphing of data from it, starting around the 18 minute mark.This is using the external triggering capability to capture power consumption.https://youtu.be/8ECNJPVHqe0?list=PLnY7rMptA7ZyAs8tc5Yyzt_gRzvtLV9cOAnd sort of a teardown done by Design World.
Owon ODP3063 - Page 1
Forum section: electronics / testgear

author: colorado.rob
author_rank: Frequent Contributor
timestamp: May 07, 2017, 04:16:32 am
content: Has anyone seen one of these in the wild yet?http://owonchina.en.made-in-china.com/product/pXfJnQyAzUrE/China-OWON-30V-6A-3-Channels-DC-Power-Supply-ODP3063-.htmlI'm looking for a good programmable bench power supply (with LXI) and the specs on this look decent. Importantly, the interface seems sane. ( I'm looking at you, Rigol.)
Hakko FX-951 Solder Station  - Page 1
Forum section: electronics / testgear

author: AlphaRomeo
author_rank: Contributor
timestamp: May 07, 2017, 01:01:17 am
content: Just got the Hakko FX-951 solder iron. Of course, as the Maestro(I've learned so much from him that I dont call youtube videos, I call Youtube School Videos) Dave L Jones says: the first thing you do when you get a device is open the thing and study it. Here are some pics. The best solder station I have ever gotten! My analog Weller(1986 stamped on it) is years behind, but still working.

author: GreyWoolfe
author_rank: Unknown
timestamp: May 07, 2017, 01:57:17 am
content: It looks like a cheesy kid's toy but it works finest kind. Mine sits next to a Metcal MX-500 and I alternate between both.

author: cdev
author_rank: Super Contributor
timestamp: May 07, 2017, 02:01:14 am
content: I love it! Its gorgeous. Definitely want one now.

author: AlphaRomeo
author_rank: Contributor
timestamp: May 07, 2017, 03:28:30 am
content: Quote from: GreyWoolfe on May 07, 2017, 01:57:17 amYes, the colors may make it looks like a kid's toy, but all what it takes to be ready from an OFF mode to fully operational is 20 seconds. Oh, it beeps at you to let you know: I am ready. I really like the SLP(sleep) mode. Just love it.
Help/Info sought - PAR600 strip recorder - Page 1
Forum section: electronics / testgear

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 05, 2017, 11:11:25 pm
content: I have recently aquired a little 2 channel paper strip recorder, which is very solidly built and seems to have a lot of features, which I can't use without further knowledge.It was allegedly made or sold by TDM Tape Services Ltd., which appears to be a defunct company formerly situated at Nottingham/Britain.Does anyone have further information on this instrument? Does anyone know an alias or other companies involved with it? Ever the user manual would be much appreciated, as the time/date setup seems complicated. Also, the LEMO input connectors as well as the 'Digital Interface' and 'Remote Port' connectors and the functions behind them are a mystery still to be lifted. The LEMO inputs are 6-pin, so tracing the circuit might involve far more than a cursory glance.Of course, service docs would be great too!
Tektronix CFG250 service manual needed - Page 1
Forum section: electronics / testgear

author: mmaseda
author_rank: Contributor
timestamp: October 13, 2016, 04:39:44 pm
content: Anyone have a link to a service manual for a CFG250 function generator?

author: Tomorokoshi
author_rank: Super Contributor
timestamp: May 08, 2017, 05:37:47 pm
content: I could never find a service manual, but I did fix one by replacing Q14, the output PNP transistor. It was shorted out. I replaced it with:https://www.digikey.com/product-detail/en/central-semiconductor-corp/2N2905A/2N2905ACS-ND/48068521. Check the resistance between the collector and the emitter (opposite pins). Should be relatively high. Mine was shorted to 7 ohms.2. Remove the part. Loosen the heatsink by wedging a screwdriver in the split to release the clamping force.3. Add a thin layer of thermal compound and slip the new part in. Remove the screwdriver to clamp in on the transistor.4. Make sure to install the plastic spacer or the case will short out to the tracks.5. Reinstall the new part.Mine worked right away. No other parts seemed to be damaged.
Front panel PC software for Kesight DMM - Page 1
Forum section: electronics / testgear

author: Ross
author_rank: Contributor
timestamp: May 04, 2017, 09:28:57 pm
content: Hi,I have a Kesight 34461A DMM and a Rigol DP832 PSU. The DMM has wonderful looking stable software, but at a price the PSU has free simple software. I use the Rigol software as an extension of my arm as it is simply a reflection as to what is on the front panel of the unit. But the Kesight software, BenchVue operates in a different way. I have now issue with these points.I cannot see on the web a software tool for emulating the front panel of the DMM on a PC and wondered if anyone new of one, even if it is third party (and hopefully free).The reason I am asking for free is that I will only be using this feature for a short time before the equipment is purposed in a situation that does not need the software.Thanks,Ross

author: LaurentR
author_rank: Frequent Contributor
timestamp: May 05, 2017, 05:57:30 am
content: The 34461A has a built-in web server with a simple UI that should do everything you need with no software install required.Just connect through the LAN port, point your browser to it and you're done.Well, almost. You need to install java, use IE (not Chrome or Edge), disable popup blockers and possibly fight with IE and/or Java security settings, but it's straightforward otherwise.Screenshot below.It is really, really handy as it can also run in "observe only" where you can remotely monitor the current state and not interfere with front panel operation or USB/LXI command streams from an automated operation.
Time Electronics 5075 7.5 digit DMM - Page 1
Forum section: electronics / testgear

author: fonograph
author_rank: Frequent Contributor
timestamp: May 06, 2017, 05:40:08 am
content: It can measure 10kv dc and 3kv ac,on tequipment site it says discontinued.The company makes metrology and calibration stuff since 1967 in UK, I never heard or read about that company or the multimeter,do you know this multimeter? Is it good?

author: rsjsouza
author_rank: Super Contributor
timestamp: May 06, 2017, 11:34:04 am
content: I haven't heard of them, but the page below shows it upfront:https://www.timeelectronics.com/ate-bench-calibrators-multimeters/

author: doktor pyta
author_rank: Frequent Contributor
timestamp: May 07, 2017, 09:22:07 am
content: Someone from Russia wants to sell this DMM on ebay.Photos included.http://www.ebay.com/itm/Time-Electronics-5075-Precision-Digital-Multimeter-/252785353065?hash=item3adb2e6169:g:QfQAAOSwYSlXgtcg

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2017, 12:25:00 pm
content: 18ppm/year accuracy seem's really good, but calibrating this puppy ??
What is the use of Q value displayed on DE-5000 ? - Page 1
Forum section: electronics / testgear

author: fishandchips
author_rank: Regular Contributor
timestamp: May 04, 2017, 12:31:52 pm
content: Hello, the LCR meter arrived and I connected it to the two terminals of the DC motor without powering the motor. It displays the L value in micro H. There is a Q value of 0.57x where x keeps increasing slowly to 9 and it seems to settle down. The screen also displays 1K Hz. What is this Q value for? When I enter the inductance value to Simulink, shall I just enter the L value without taking Q and 1K Hz into account? Thanks

author: David Hess
author_rank: Super Contributor
timestamp: May 04, 2017, 12:39:39 pm
content: Q (quality factor) is the inductive reactance divided by the series resistance. At low frequencies, it is proportional to frequency. In this case, Q represents the series resistance.It would be more useful to measure the inductance and series resistance separately.

author: fishandchips
author_rank: Regular Contributor
timestamp: May 04, 2017, 03:49:01 pm
content: Thanks. By "series resistance", do you mean the internal resistance of the motor in this case? What are the units for resistance and inductance in the equation?https://en.wikipedia.org/wiki/Inductormentioned something about radian operating frequency in the equation. Is it 1000  in this case?

author: helius
author_rank: Super Contributor
timestamp: May 04, 2017, 04:10:40 pm
content: Hz are cycles per second. Angular frequency in radians is 2pi times the frequency in Hz: this is because there are 2pi radians of angle in each cycle.Q is a way of measuring how "non-lossy" is an inductor or capacitor. The lower Q is, the more energy is lost during each cycle of oscillation, so if you had an LC tank circuit, the number of cycles it oscillates before dying out is proportional to Q.

author: David Hess
author_rank: Super Contributor
timestamp: May 04, 2017, 05:23:23 pm
content: Quote from: fishandchips on May 04, 2017, 03:49:01 pmThe series resistance is the DC resistance between the terminals which includes the wire and commutators.QuoteThe series resistance is ohms and the inductive reactance is also in ohms.QuoteThe inductive reactance measured in ohms varies with frequency.
When the luck winner from keysight month will start the selloff - Page 1
Forum section: electronics / testgear

author: ebclr
author_rank: Super Contributor
timestamp: April 27, 2017, 11:52:33 am
content: I would be interested in buy the high-end ones, at a reasonable price

author: Fred27
author_rank: Unknown
timestamp: April 27, 2017, 03:46:27 pm
content: Hang on a minute. We've got to have "moaning about taxes week" first.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: April 27, 2017, 05:12:40 pm
content: That's my favorite week.

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: April 27, 2017, 06:19:25 pm
content: Quote from: Fred27 on April 27, 2017, 03:46:27 pmI have a cunning plan to avoid that. Send the winner to live in Malaysia!

author: LaurentR
author_rank: Frequent Contributor
timestamp: May 04, 2017, 04:48:52 am
content: First winner?http://www.ebay.com/itm/Keysight-MSOX3104T-/302300394434?hash=item466281f3c2:g:gDcAAOSwlndZBX9oAs to moaning about taxes, I can contributeIt's cheaper for me to buy a Premium Used scope from the Keysight EBay store than to pay income taxes on any scope month win (Uncle Sam + Golden State). I have stopped playing and started watching EBay instead

author: abraxa
author_rank: Frequent Contributor
timestamp: May 04, 2017, 05:41:30 am
content: Quote from: LaurentR on May 04, 2017, 04:48:52 amFrom Kazakhstan? Don't remember that country on the list of eligible countries. Who would buy such a thing from a brand new ebay account anyway? Especially if it's grossly overpriced? Someone is certainly delusional here, and it's not you or me

author: ebclr
author_rank: Super Contributor
timestamp: May 04, 2017, 07:01:37 am
content: That's not a winners price, I guess is a dreamer, not a winner

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: May 04, 2017, 08:05:55 am
content: Quote from: Fred27 on April 27, 2017, 03:46:27 pmWhat about 'moaning about not being able to enter' that is my favourite week.
Micronta 22-195 Multimeter  Display Jumps - Page 1
Forum section: electronics / testgear

author: animal12
author_rank: Newbie
timestamp: May 04, 2017, 02:27:15 am
content: hello folks , found this site while trying to trouble shoot my meter . After power up it randomly flashes a 3 in the first segment , any clues as what may be wrong ?tksanimal
Keithley 190, 5 1/2 digit nixie tube multimeter - Page 1
Forum section: electronics / testgear

author: maelli
author_rank: Contributor
timestamp: April 25, 2017, 06:16:12 pm
content: Got this beauty cheap from internet, lucky me.All 74xx TTL, datecode 1973 and 1974.Two board construction: digital on the top, analog on the bottom.Five nixie tubes, extra neon bulbs for minux, oxerrange and first 1.At first glance still within specs... 0.005% on DC volts.And the manuals are still available, onhttp://www.tek.com/manual/keithley-model-190-digital-multimeter-instruction-manual-rev-d

author: Dr. Frank
author_rank: Super Contributor
timestamp: April 25, 2017, 07:46:08 pm
content: Just beautiful.Just love these old TTL bricks.. date code lets me remember my own first steps with such TTL graves.Thanks for sharingFrank

author: Vgkid
author_rank: Super Contributor
timestamp: April 25, 2017, 08:04:44 pm
content: That is a neat old keithley. Thanks for tearing it apart.

author: Gyro
author_rank: Super Contributor
timestamp: April 25, 2017, 08:21:25 pm
content: Now that's what a meter should look like inside!No eeproms, batteries, flash, f/w bugs, or multilayer boards. Easily maintainable with the full component level service manual. There's no reason why it shouldn't give nice, well aged, performance for years to come.Shame they didn't make the 10V range Hi-Z though.P.S. You might want to drop a link to it in this thread...https://www.eevblog.com/forum/reviews/lets-see-your-nixie-tube-equipment/

author: bitseeker
author_rank: Super Contributor
timestamp: April 25, 2017, 09:53:16 pm
content: Added the link over there for ya.

author: TiN
author_rank: Super Contributor
timestamp: April 26, 2017, 04:17:47 am
content: Sweet box

author: maelli
author_rank: Contributor
timestamp: May 02, 2017, 07:13:30 pm
content: after a few hours of operation: display shows random numbers...repair was simple "thou shall check voltages": -15V rail had a huge 100Hz ripple.Repair was simple, the culprits were the electrolytics, one was leaking current the other one had 5uF instead of 220uF.43 years old, made in Hong Kong and so close to the heatsink dont go well together ;-)

author: Paul Moir
author_rank: Frequent Contributor
timestamp: May 02, 2017, 08:44:41 pm
content: It's amazing how different this is from the same era Fluke 81xx with it's three digital ICs and two shovelfuls of discrete transistors to get 4 1/2 digits.

author: bitseeker
author_rank: Super Contributor
timestamp: May 02, 2017, 09:39:19 pm
content: Yeah, exactly. That 190 is really nice.

author: kj7e
author_rank: Frequent Contributor
timestamp: May 03, 2017, 04:54:54 pm
content: Nice! I still have an HP 3440a I have owned since I was 9yo in the closet, with a bunch of plugins.
Help, my 34401A is too fast! - Page 1
Forum section: electronics / testgear

author: babysitter
author_rank: Frequent Contributor
timestamp: May 03, 2017, 07:22:02 am
content: Hi,I am supporting a coworker who needs digitizing a step response but it appears that the Multimeter is sampling faster than the 1000 readings/second as per user manual. Counting the periods of a measured sinewave out of a sig gen gave a smaller number than calculated (coarse), my coworker doing the actual test did fft and the measured peak hits the sig gen frequency when using a sample rate of 1428.5 samples per second.O-scope measurements and comparison with mains frequency are consistent with "sig gen and scope are okay."Is there a explanation, does a "sample rate calculation" formula from KS exist?Below you find the original script derived from Keylett-Packsight recommendation, the ++ commands are for the Prologix GPIB adapter.BRBabysitter++auto 0++addr 20*RST*CLSCONF:VOLT:DC 1.0,0.001VOLT:DC:NPLC MINZERO:AUTO OFFVOLT:DC:RANG:AUTO OFFCALC:STAT OFFTRIG:SOUR EXTTRIG:DEL 0SAMP:COUNT 500DISP OFFINITEdit:More details: We set the sig gen to 100 Hz. The first hint was that we had 35 instead of 50 periods when we plotted U over t.He took a FFT assuming a 1000 Hz sample rate and deduced the actual rate from the difference.To verify, he checked if he gets a peak at 100 Hz and if he gets a 428 Hz Alias signal when measureing a 1000 Hz signal.

author: nfmax
author_rank: Super Contributor
timestamp: May 03, 2017, 07:53:45 am
content: Are you using the external trigger input on the rear panel? That should completely control the time of sampling, unless youbtrybto go too fast.

author: babysitter
author_rank: Frequent Contributor
timestamp: May 03, 2017, 07:58:42 am
content: I initiate the measurement by BNC input, but every trigger will initiate 500 self-timed samples, as defined bySAMP:COUNT 500I could trigger each reading by the BNC with a additional pulse gen giving a sample rate up to 1 ksample/s but i dont.
ds1054z vs GDS-1054B - Page 1
Forum section: electronics / testgear

author: whitevamp
author_rank: Regular Contributor
timestamp: May 02, 2017, 12:36:11 am
content: ok i know this question has beenbut i am going to ask it any how.I finally got enough $$ to get me a new scope, and i have been reading a lot of the posts on here about the best budget scope to get but they are usually referring the rigol 4 chan to a 2 chan.i am wanting to know about budget 4 chan scopes, and now that a new 4-chan budget scope is out what one is the better choice.and i have not really found any info on the new GW scope. comparing the 2 scopes.1. i don't care about fft2. decoding is a requirement though.3. 4 chans is a must.4. hack ability is mehh .. im looking at them before any hacks.so what one is the better bang for the buck scope?rigol or GWPS: will be looking at arduino signals and other misc stuff.

author: tautech
author_rank: Super Contributor
timestamp: May 02, 2017, 12:48:19 am
content: The content and theme of this thread is still very relevant if you have some time before you make a final choice.https://www.eevblog.com/forum/testgear/scope-wait-for-new-models/

author: saturation
author_rank: Super Contributor
timestamp: May 02, 2017, 05:59:07 pm
content: There is a full review of the 1054B I wrote in the forum, but key is all the 1000B series models donotdo serial decoding. So from the start, the 1000B series is not in your requirement list.The Z will do the job albeit it has its quirks particularly if serial decode is a must. The GWInstek 2000 series does everything its expected to do quickly with serial decodes and works like a professional tool but it cost far more, even with USA discount prices.Quote from: whitevamp on May 02, 2017, 12:36:11 am

author: Fungus
author_rank: Super Contributor
timestamp: May 02, 2017, 06:28:53 pm
content: Quote from: whitevamp on May 02, 2017, 12:36:11 amYou already eliminated the GDS-1054B.You don't care about FFT, so... Rigol all the way.PS: There's no downside to hacking and 100MHz+extra memory is worth it. The hacks can be removed in seconds if needed, leaving no trace.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 02, 2017, 06:42:20 pm
content: Another tip: depending on the decoding needed, you can probably get away with a cheap logic analyzer from eBay and expand your options. This way you can make an evaluation on the oscilloscope performance of its core functionality.

author: whitevamp
author_rank: Regular Contributor
timestamp: May 02, 2017, 10:58:54 pm
content: thanks every one on the input to my question, here.and i just pulled the trigger on getting the 1054z.

author: ebclr
author_rank: Super Contributor
timestamp: May 03, 2017, 05:46:22 am
content: Also 1054 100 Mhz specification is very strict, The real thing can go much higher than 100 Mhz
Owon AG1022 - Page 1
Forum section: electronics / testgear

author: DanielSpokane
author_rank: Regular Contributor
timestamp: May 02, 2017, 03:35:25 am
content: Looking for a decent budget AWG. Currently and an HP 204C Oscillator; it's a little bit flightily and I'm thinking I need to replace. I mainly use it with my scope for trouble shooting tube amps and the like. Would like something a bit more reliable... and perhaps a little upgrade.Anyone have any thoughts on the Owon AG 1022? Might be a good budget upgrade. Seems like it compares spec/quality to the Rigol DG1022. Agree? Thoughts?

author: DanielSpokane
author_rank: Regular Contributor
timestamp: May 03, 2017, 05:38:49 am
content: Wow... not a single response. We must be dealing with some seriously top secret gear here...

author: ebclr
author_rank: Super Contributor
timestamp: May 03, 2017, 05:41:23 am
content: http://www.batronix.com/shop/waveform-generator/Siglent-SDG2042X.htmlTo fill up the empty space, I own one and is good
Rigol MSO4000 triggering/holdoff question - Page 1
Forum section: electronics / testgear

author: omegahacker
author_rank: Newbie
timestamp: May 02, 2017, 07:07:41 pm
content: I just got a new Rigol MSO4024 for work, and so far it's not really working all that great. Immediately I ran into a bug where the serial decode (CAN) would just spontaneously drop off the screen while scrolling horizontally, and not come back without retriggering.But the biggest bummer for me right now is that it's not showing the most recent trigger after holdoff. Specifically, the signal I'm looking at right now consists of a low pulse for ~2mSec caused by the reset of the generating microcontroller, then ~160mSec later a CAN packet being transmitted. The scope is in Normal mode with the min 100nS holdoff.On my previous scope (Keysight MSOX2014), it would trigger on the boot pulse, then trigger on the CAN leading edge, and stop on the CAN leading edge. Alternately, if I had the timebase zoomed in enough, it would actually trigger several times and show me the last one (the retrigger window seemed to be the width of the screen).On the Rigol unit, all it shows me is the boot pulse, unless I go through many extra steps to either do segmented record and find the right edge, or set up Nth edge which only works until it doesn't. However, if I hit the reset button on the MCU a couple times ~250mSec apart, I can see the scope showing me the 1st boot pulse, then the 2nd, then *usually* stopping at the 2nd-boot CAN packet.Am I missing anything here? I've been through all the options, and nothing seems conceptually different from the Keysight scope (or even my really old Tek TDS224), but the Rigol just isn't matching behavior with what I expect (and need).Thanks!

author: Teuobk
author_rank: Contributor
timestamp: May 03, 2017, 01:36:06 am
content: Do you have your memory depth set to "auto" (or at least a relatively low value)? If not, it's possible the scope isn't triggering on the CAN leading edge because it's still recording the waveform from the trigger on the boot pulse. Try changing the memory depth to "auto" and then zooming in so the span is well under 160 ms.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 03, 2017, 05:00:15 am
content: https://goo.gl/photos/bFrMoT86Rt2UtddK7My Rigol DS4014 has 30ms of dead time in a similar, simulated setup. Not great, but I really don't think that should be a show-stopper for your particular use case. Is your scope behaving differently from mine? Or do I just not understand the problem?
EMCO T153BS = TEKTRONIX 011-0049-01 - Page 1
Forum section: electronics / testgear

author: rustybronco
author_rank: Contributor
timestamp: May 03, 2017, 06:31:13 pm
content: Both have Kings KC 89-108 markings on them.If you are in need of a 50 ohm 2W feed through termination, consider purchasing the EMCO variant as to me, they are one in the same.Examples...http://www.ebay.com/itm/2-EMCO-TI53BS-Feed-Through-Termination-50-Ohm-2-Watt-/311799011098?hash=item4898ab571a:g:l1IAAOSw~AVYnK8mhttp://www.ebay.com/itm/Tektronix-Termination-BNC-Male-50ohm-2W-011-0049-01-Used-/272609256197?hash=item3f78c72305:g:xBsAAOSwmgJY2tiz
Where to get Rigol Bildschirmkopie? Peter Dreisiebner's website down - Page 1
Forum section: electronics / testgear

author: tyblu
author_rank: Frequent Contributor
timestamp: May 02, 2017, 03:13:07 pm
content: Hey,Peter's websiteisn't working for me. Not sure how long it's been like this or how long it'll last.Does anyone have a copy of his Rigol Bildschirmkopie software?

author: RoGeorge
author_rank: Super Contributor
timestamp: May 02, 2017, 03:23:13 pm
content: I don't know, but I translated the word and it looks like a screen capture program over LAN. Maybe you can use this one until that site is back:https://github.com/RoGeorge/DS1054Z_screen_captureOr, if you have access to a Linux machine, you don't need anything, just open a terminal and type:Code:echo ":DISPLAY:DATA? ON,OFF,PNG" | nc -w1 192.168.32.208 5555 | dd bs=1 skip=11 of=image.pnghttps://rogeorge.wordpress.com/2017/01/10/ds1054z-tricks-less-known-or-undocumented-part-2

author: ebastler
author_rank: Super Contributor
timestamp: May 02, 2017, 07:06:52 pm
content: Peter's site is back up.

author: pelule
author_rank: Frequent Contributor
timestamp: May 02, 2017, 07:55:41 pm
content: The page is up and running.The software zip file os too big to upload here.I have attched the english hlep file to have a look to the function.

author: technogeeky
author_rank: Frequent Contributor
timestamp: May 02, 2017, 10:01:24 pm
content: Quote from: RoGeorge on May 02, 2017, 03:23:13 pmIt's worth noting that, for me at least, the USB capture is about one order of magnitude faster than the LAN capture. I may be the only person left using USB capture with this program; I had to use 32-bit schroot to do it. But I get about 3 captures per second this way.For example, here is a capture showing three stages of the behavior of a power supply:(start) very noisy, lots of ripple(cool something with compressed air) ripple reduces in amplitude very fast(warm up) the ripple slowly returnsI don't think this would have been possible to capture without USB (unless UltraSigma is somehow very fast).

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 03, 2017, 12:00:19 am
content: this one can do DS1000Z series screen capture, besides raw data capture for DS1000 and DS2000 (for WinXP compatible Windows, limited test done in freshly installed Win 7 and 10, and limited test on DS2000 series)... fwiw...http://www.soasystem.com/download/visadso/
Suggestions for AC/DC RMS Clampmeter - Page 1
Forum section: electronics / testgear

author: RAVC
author_rank: Newbie
timestamp: April 30, 2017, 11:50:48 pm
content: I need to purchase and AC/DC RMS clampmeter and have narrowed the list yet, thought members here might me able to enhance my efforts. To date, the Klein Tools CL800 appears to be high on the list with regard to value. I have also examined Fluke, B & K Precision and, Mastech. The Uni-T UT210E looks to be difficult to challenge if its spec's meet your needs but its low current capability will not meet my needs. However, I may buy one to give my son an education in electronics.I have spent a lot of time looking at used equipment as well but, do not see the sense in this unless I know the history of the meter.The option I have not evaluated well is the multimeter, clamp as separate components.

author: P90
author_rank: Frequent Contributor
timestamp: May 01, 2017, 12:56:32 am
content: Don't know what your needs are, but check out the Amprobe AMP-2xx and AMP-3xx series made by Brymen.

author: RAVC
author_rank: Newbie
timestamp: May 02, 2017, 01:20:07 am
content: You are right. The AMP-220 and AMP-320 appear to be nice options. They are a little more costly for me so, I have some thinking to do. I was considering a used B&K Precision 313A but, B&K informed me these tend to lose their accuracy. Not much, and this was not quantified for me during my discussion with technical support yet, this gives rise to a $40 fee for a NIST calibration and $20 for shipping. These fees make the used market a less attractive option.

author: Electro Detective
author_rank: Super Contributor
timestamp: May 02, 2017, 05:09:37 am
content: If it's a possibility, compare a decent brand cheapie with a Fluke and if readings are close, especially on clamped DC, it's good enough imhoDurability, robustness and budget is your callfwiw the Uni-T UT210E is next on my wish list for the low AC/DC current ranges and small size.(assuming I can get one on Ebay Australia from a genuine stockist seller that accepts non-paypal money)I suspect some EEVites will pop by shortly to suggest lotsa goodies
HP 85046A Directional Bridge photo - Page 1
Forum section: electronics / testgear

author: orin
author_rank: Frequent Contributor
timestamp: May 01, 2017, 06:35:32 pm
content: I added the 85046A picture to the thread with the 85046B pictures:https://www.eevblog.com/forum/testgear/hp-85046b-directional-bridge-splitter-photos/msg1198416/#msg1198416
Hoefer Scientific Instruments PS 1200 DC Power Supply - Page 1
Forum section: electronics / testgear

author: jonwilhelmjr
author_rank: Regular Contributor
timestamp: April 30, 2017, 11:00:05 pm
content: I was given a "Hoefer Scientific Instruments PS 1200 DC Power Supply" and I am trying to locate as much info as i can on this equipment. I am not sure what I should do with it either. As far as voltmeter testing has allowed, I have tested the voltage output and its in spec once warmed up. How can I use this supply? Is this supply as good as trash? What was the supply used for back in the day? Does anyone have a manual or user manual?Specs:1200V250mA300WThank you for everyones help and advice.-Jon

author: mmagin
author_rank: Frequent Contributor
timestamp: April 30, 2017, 11:09:00 pm
content: I have one of these. Never found a manual. As I understand it, it's an electrophoresis power supply (newer ones are much smaller switching power supplies.It's certainly enough voltage and current to kill you, so be careful.The weird things I have been able to discern about this that makes it kinda wonky as a bench supply:- Current mode isn't a current limit, it seems to be "try to source this much current up to the voltage limit (600 or 1200 volts).- It kinda goes slowly. On purpose?- I can't quite figure out program mode.I'll probably eventually use it for parts: Old as they are, the digital panel meters seem to be good stuff, the pots and knobs are solid, and it has a transformer suitable as a plate supply for a tube-based RF amplifier or modest vacuum tube tesla coil.

author: jonwilhelmjr
author_rank: Regular Contributor
timestamp: May 01, 2017, 05:49:31 pm
content: The only project I could think of would be a tesla coil. From turning it on I noticed the response to the adjustment dial is several seconds slow. I am thinking that's because of large caps. Great care will be taken with this supply I don't feel like killing myself. Have you been able to dial in an exact voltage and maintain it? I am lacking tubes to play with, maybe I can make one?
NVRAM dump for TDS340 and TDS340A? - Page 1
Forum section: electronics / testgear

author: james_s
author_rank: Super Contributor
timestamp: May 01, 2017, 08:12:05 pm
content: Anyone got a dump from the DS1644 in a TDS340 or TDS340A with valid calibration constants? I have one of each scope, both lost the calibration constants when the DS1644 battery died and now they complain at every power up and fill the error log. I've been successful at calibrating the DC voltage but the timing calibration routine seems to be too picky to calibrate with the equipment I have. The scopes both seem to be plenty accurate in all the tests I've tried, they work fine and I just want to stop them from complaining about the calibration constants at each power up self test. If I can find an NVRAM image to put in the DS1644 then I can re-run the voltage calibration routine and I think it will be good enough for my purposes. I use one of these as my "compact" portable scope that I can take with me when I don't feel like lugging around the TDS784 beast, I don't need super accurate NIST traceable calibration.
What does your work bench look like - Page 1
Forum section: electronics / testgear

author: Joel_l
author_rank: Frequent Contributor
timestamp: April 30, 2017, 09:31:06 pm
content: Moving over to other thread.Thanks

author: nctnico
author_rank: Super Contributor
timestamp: April 30, 2017, 09:33:01 pm
content: There is a loooong thread with the same title in the general chat section.

author: ovnr
author_rank: Frequent Contributor
timestamp: April 30, 2017, 09:41:22 pm
content: Here's a link for the lazy:https://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/
arduino big problem !  - Page 1
Forum section: electronics / testgear

author: fadyeid
author_rank: Contributor
timestamp: May 02, 2017, 03:53:25 pm
content: hello I am studying engineering so I have a project with aurduino ,I have windows 8.1 and when I run the aurduino software and try to upload gives me error not connected to com1 ,I cant even install the driver for itneed help asap no time the project should be worked Thursday thanks

author: igendel
author_rank: Frequent Contributor
timestamp: May 02, 2017, 04:08:45 pm
content: Arduino boards never show up on COM1. With the Arduino connected, open menu Tools->Port, and choose what is available there (like "COM3" or "COM10").If no port is available, that's a different problem - maybe incorrect drivers.Also, "Test Equipment" is probably not the right forum for this question

author: Fungus
author_rank: Super Contributor
timestamp: May 02, 2017, 04:17:53 pm
content: If your "Arduino" is a cheap Chinese clone then you might need a special driver.Clue: The trick is to look at the little serial controller chip on the board and read the number there.PS: What does this have to do with "test gear"? Why aren't the Arduino forums a better place to ask?

author: shteii01
author_rank: Frequent Contributor
timestamp: May 03, 2017, 01:12:50 am
content: Arduino is an organization.Telling us that you have arduino, tells us nothing.

author: amspire
author_rank: Super Contributor
timestamp: May 03, 2017, 01:22:19 am
content: A photo will be good. If it was a recently purchased board, it could easily have a CH340 family RS232 to USB chip.If it has a chip with a name like this, see this page:http://www.arduined.eu/ch340-windows-8-driver-download/You will need to know the type of Arduino board this clone is copying - an Uno? a Duemilanove? You have to configure the Adruino IDE correctly to the board type.

author: DaJMasta
author_rank: Super Contributor
timestamp: May 03, 2017, 01:44:17 am
content: You need to have the driver for the device installed, if it's a regular, brand name board of theirs, the drivers can also be found in Arduino\Drivers\ in the install directory. Aside from that, you also need to make sure the serial port you're trying to program on is set correctly, the Port pulldown menu in the Tools menu in the IDE.And yes, the beginners or microcontroller subforum is probably the right place for this.
DIY MEGA388 KIT MANUALS - Page 1
Forum section: electronics / testgear

author: rabbi_josiah
author_rank: Contributor
timestamp: April 30, 2017, 05:02:13 pm
content: trying to upload this pdf for everyone size too big huh???

author: rabbi_josiah
author_rank: Contributor
timestamp: April 30, 2017, 05:32:41 pm
content: ok for all those reading this i am trying to upload another filethat is the actually assembly manual i have zipped it i have rared it and still the file is too bighow can i compress the file so i can upload itthe file is over 2mb

author: ataradov
author_rank: Super Contributor
timestamp: April 30, 2017, 06:39:32 pm
content: Why do you think we need those manuals here? And forum software seems to agree.

author: rabbi_josiah
author_rank: Contributor
timestamp: April 30, 2017, 07:16:53 pm
content: ok will try this with google docsthis link works in preview modehttps://drive.google.com/file/d/0B10V3WQ_LRjGeEdYRTlKVGdkYUE/view?usp=sharing

author: rabbi_josiah
author_rank: Contributor
timestamp: April 30, 2017, 07:29:13 pm
content: well thank you for your kindwords of encouragement,however the serious question or rather answer is that i actually did not read the caveatof file sizes on the attachment and options uploadagain this 'old man ' :-//wishes to thank you for your encouragement and enlightenmentsof this day
MATRIX MDS-620 Osciloscope - Page 1
Forum section: electronics / testgear

author: przemas1983
author_rank: Newbie
timestamp: April 26, 2017, 12:34:42 pm
content: Hello, I'm looking for service manual or schematic to MATRIX MDS-620 Osciloscope. Thanks for help.

author: tautech
author_rank: Super Contributor
timestamp: April 26, 2017, 12:57:10 pm
content: Quote from: przemas1983 on April 26, 2017, 12:34:42 pmWelcome to the forum.Can you post up a pic of the scope.....it might be a rebrand and then we might be able to identify it and the OEM for the manuals.

author: przemas1983
author_rank: Newbie
timestamp: April 26, 2017, 01:28:16 pm
content: I upload two pictures of this oscilloscope: inner view and outer view

author: tautech
author_rank: Super Contributor
timestamp: April 27, 2017, 10:40:34 am
content: I think one from this list will be very close, check them out:https://www.manualslib.com/brand/matrix/test-equipment.html

author: przemas1983
author_rank: Newbie
timestamp: April 30, 2017, 08:57:48 am
content: Yes, but this instruction consist only block diagram. I need schematic diagram. Thank's for help.