hybridfree/eevblog-posts huggingface dataset:
Rigol RP7080S Active Probe Advice? - Page 1
Forum section: electronics / testgear

author: NF6X
author_rank: Unknown
timestamp: November 02, 2016, 12:55:24 am
content: In the day job, I'm debugging a low-powered 32.768 kHz crystal oscillator circuit which is having start-up issues. I have a Rigol DS4024 oscilloscope on the bench. Its RP3500A passive probes load the oscillator circuit too much, preventing start-up (which is already marginal), and damping the oscillations severely once the oscillator is running. I think I will need an active probe to be able to observe the oscillator as I work on both load capacitor tuning and RTC block configuration in the firmware, though I'm open to advice regarding other probing techniques.The Rigol RP7080S looks like a natural fit since it is designed to work with the scope I have. I'm having trouble finding any reviews of it, though, so I'm hoping that somebody here is familiar with it and can share their experiences and opinions.One of the specification lines in theuser's manualconcerns me: "input noise" is specified as "70mVpp", which seems much too high. Is that a typo?! For comparison, I looked up the specifications of the least expensive Keysight active probe I could find. TheKeysight N2795A datasheetspecifies its "probe noise" as "< 2.5 mVrms (referred to input)". I'm not sure if the Rigol vs. Keysight noise specifications refer to the same parameter under the same conditions.

author: Someone
author_rank: Super Contributor
timestamp: November 02, 2016, 02:41:56 am
content: Its hard to find reviews on any professional measurement hardware, but good to see Rigol finally offering some active probes. They're closer to the Keysight 1130B product (with many identical specifications) but even with the 1130B input noise of 3mV over a smaller operating voltage its still has a much higher signal to noise ratio. Using off the shelf parts I'd expect them to be getting better noise specifications since their input impedance is 25kOhm to ground, so it might be a typo.

author: ADT123
author_rank: Regular Contributor
timestamp: November 02, 2016, 05:41:49 am
content: As your frequency is only 32kHz you can probably cheat and get away with using a passive probe. Check the spec of the passive probe for its tip capacitance (eg 12pF) and then check what the cap to ground value is in the oscillator circuit (eg 22pf). Replace the cap to ground with one that in this example would be 10pf so that when the scope probe is attached the total load is back to 22pf.

author: MarkL
author_rank: Unknown
timestamp: November 02, 2016, 09:41:22 pm
content: You might also want to consider getting the Rigol T2R1000 Tektronix probe to Rigol scope adapter for US$299 and then pick up a used Tektronix active probe.A Tek P6245 can be had for around $100 to $150: 1.5GHz, 1Mohm, <1pF, and is supported by the T2R1000 for calibration and offset control.The adapter opens the door for a lot of other good probe bargains too.
RF Signal Generator Leader LSG-221B - Page 1
Forum section: electronics / testgear

author: Ginettag20
author_rank: Regular Contributor
timestamp: November 08, 2016, 09:10:55 pm
content: Hi EveryoneJust thought it would be worth asking if anyone has any service information for the Leader LSG-221B. The one I have has a perfect CW output at all frequencies until I switch on the modulation. When is drop from 1mw too 1uW. I dont have the user information for this equipment but I dont think this is correct. I dont really want to go poking around inside without some form of manual as its all RF sections are in screened cans so not so easy to access parts.Any info much appreciatedBest Regards Chris
Agilent E4402B SA repair - Page 1
Forum section: electronics / testgear

author: rramirez
author_rank: Contributor
timestamp: July 23, 2014, 05:19:43 pm
content: I acquired the subject spectrum analyzer at a good price, but only the high-band is work correctly. The low-band(s) are not functioning and I cannot Cal the unit because unlike some other models, this one uses a 50MHz Amptd source, which obviously lies in the lower band. I will soon be diving into the main RF module/assembly to isolate the issue, because this is a $5600 part, which appears to be LO related at the 1st or second conversion stage. I have a few questions.1. Has anyone done a similar repair?2. Does Agilent use a single source to re-furb their assemblies for spares?3. Are they using Hittite, Avago, or similar actives that are available, or are they still using their own custom silicon?Russ

author: imett
author_rank: Contributor
timestamp: October 31, 2016, 05:42:17 pm
content: i think it is the prescaler, try with hittite hmc368
Rigol DS1054z serial decode problem - Page 1
Forum section: electronics / testgear

author: artelse
author_rank: Regular Contributor
timestamp: October 31, 2016, 12:06:10 pm
content: Trying out the serial decode option on my Rigol DS1054z and can't figure out why it is not decoding properly. I've set trigger to rs232, baud, etc. , but it seems to treat every pulse as a full frame? See attached screenshot and text file with settings where I send an uppercase U (0x55). As I am just starting to explore this functionality perhaps I need another setting?

author: Fungus
author_rank: Super Contributor
timestamp: October 31, 2016, 01:43:23 pm
content: a) Most RS232 signals start high and go low when there's data.b) Try sending a different byte and see if it's what you expect.

author: nctnico
author_rank: Super Contributor
timestamp: October 31, 2016, 02:02:16 pm
content: Quote from: Fungus on October 31, 2016, 01:43:23 pmThat is on TTL level. On real RS232 you see what is pictured in the screendump (note the v/div setting!). If the OP sets the decoding to 'idle low', not-inverted, -whatever Rigol calls it- it should work.

author: Fungus
author_rank: Super Contributor
timestamp: October 31, 2016, 02:06:11 pm
content: Quote from: nctnico on October 31, 2016, 02:02:16 pmI see 2 v/div, 5.3Vp/p."Real" RS232 would be +/- 12V.

author: nctnico
author_rank: Super Contributor
timestamp: October 31, 2016, 02:08:42 pm
content: Hmm yeah. I'm too used to 3.3V (and less logic).

author: H.O
author_rank: Frequent Contributor
timestamp: October 31, 2016, 02:10:08 pm
content: Except the polarity setting, what's the baudrate?I see in the settings file that the decoder is set to 2400 baud but the bit-time seems to be WAY to long for tat.

author: artelse
author_rank: Regular Contributor
timestamp: October 31, 2016, 02:27:17 pm
content: Thanks for the replies! I found the problem, it was the cheap ass Chinese USB - Serial converter.. I swapped it with a decent one et voila all is fine! The problem with the board now also became apparent: a faulty MAX236.
tektronix 1241 and single line stream - Page 1
Forum section: electronics / testgear

author: gobo
author_rank: Newbie
timestamp: October 30, 2016, 03:24:27 pm
content: to those of you that can still remember how to use the old tek 1241 logicanalyzer.i've got a really slow single line stream, like 20hz, that is alwaysrepeating. i'm not worried about the width and duration, i can measurethat with a scope. but i do want to see a visual representation of thestream.it seems like the easiest way would be to set it to immediate triggering,push the start button and let it run till the memory is full. i've spenthours trying to do this with no luck.the scope seems to work. i ran the test where you connect a pod to theinternal test generator. it gives me a display that mostly looks likethe manual (i only have one cable set) so i have to believe the problemis me and not the machine.i have attempted this sort of thing with this analyzer several times inthe past and always given up in frustration. so with all that said,can anyone point me to a "logic analyzer for dummies" or some kind ofcheat sheet on this machine that will help me use it? something fordecoding single line streams?thanks in advance.
LISN "MAC 1001" 250/50uH tear down - Page 1
Forum section: electronics / testgear

author: wemme
author_rank: Regular Contributor
timestamp: May 09, 2015, 08:06:40 am
content: I am super stoked to get my hands on this single phase lisn today.Only thing I found dodgy was a screw terminal block that had been over torqued at manufacture splitting the housing.Expecting only a single set of 50uH chokes i was pleasantly surprised by finding a 250uH input filter also built in which is mostly left out of cheap units.The coax switching up the front could have been a bit better but all and all i am very happy with this score.If anyone has any information on this unit or if anyone wants any particular snap shots or details please let me know.RegardsBart

author: mvdeventer
author_rank: Newbie
timestamp: November 05, 2015, 01:40:48 pm
content: Hi wemmeDo you still have this unit, if so, can you maybe post the component values on the PCB's and more or less a schematic layout if this unit. It looks fairly simple. Or maybe you can just take more detailed photos. I've more or less drawn the schematic but still short the component values.Regards

author: wemme
author_rank: Regular Contributor
timestamp: November 29, 2015, 07:26:35 am
content: Hi sorry for the late post for some reason it didn't come up...Yes I still have it and have a schematic for it which i just drew up as you say these things are pretty simple and the LCR values are specified in the standards.RegardsBart

author: electy
author_rank: Newbie
timestamp: October 30, 2016, 06:23:56 am
content: Hello dear bro,I'm going to make a lisn for our EMC tests in the university, and since the last 3 month I have studied a lot about EMC, and even I made a prototype of a lisn, based on the catalogs of commercial ones available on the net.I appreciate this post of you to show me a tear down of this lisn, but what is the two holes in the back side of the lisn, the first is for power coming through the red and black wires, but I couldn't guess the second one?and have you made a lisn your self?does the inductors of this lisn resonate, because I do not see 470 ohm resistors between the turns of the 50 uH inductors as recommended in the CISPR 16.Thanks in advance ...Quote from: wemme on May 09, 2015, 08:06:40 am
Tektronix 561A Calibration - Page 1
Forum section: electronics / testgear

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 26, 2016, 11:39:36 pm
content: Starting of with a ranton a specific issue, although I'll post anything else on the calibration of this unit here too.I have the base unit working mostly within spec (except I have not checked the HV level or a few of the secondary voltages) but that was pretty easy becuase the manual was of the quality you would expect from Tektronix.The 3A1 plugin manual however...(Can't post it here, I don't remember the link, but you should be able to find it.) The problem I notice is the input amplitude is a bit low. I don't have a standard, but I adjusted the calibrator so I used that (it doesn't have to be perfect). However...I can't calibrate it because the manual is wrong! The plugin is for the entire 560 series, so someone made a mistake in considering all models. It asks to set the input to DC .01V and adjust the level to 6 large divisions with 50mV (it says to go back to 5 later). But the 561A only has FOUR divisions on each side of center!They even show a 561A in the diagram!I would just set it to AC and set it to 2.5 divisions each side, but the square wave is not straight in AC mode (another problem). Yes, I am using 50cable, it's already been upgraded to BNC jacks, so it is an input problem. And there is only one set of instructions, not different ones for each model.So now what? How do I adjust the input amplitude? Can I use a different voltage and still get correct calibration?EDIT:that omega symbol is also wrong by a few divisions...

author: andy2000
author_rank: Frequent Contributor
timestamp: October 27, 2016, 05:46:13 am
content: You could start with the trace 2 divisions below the center line.

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 27, 2016, 05:43:58 pm
content: Quote from: andy2000 on October 27, 2016, 05:46:13 amI'll try, but it seems to be clipping the signal (reducing higher voltages more than lower ones). Hopefully it can be adjusted correctly.

author: David Hess
author_rank: Super Contributor
timestamp: October 29, 2016, 07:28:26 am
content: It is normal for there to be some non-linearity so accuracy is only specified over the center divisions but if the non-linearity is too great, then that indicates a problem. The linearity is tested by displaying a 1 division signal at the center of the CRT and then watching to see how it changes with vertical position.Quote from: Cyberdragon on October 26, 2016, 11:39:36 pmJust use a 40 millivolt peak-to-peak signal at 0.01V/div for calibration. There is nothing sacred about 60 millivolts.There may have been an mid life change to the CRT for the 561A which altered the number of vertical divisions.
Rigol DS1102E vs DS1054Z - Page 1
Forum section: electronics / testgear

author: AndrewNorman
author_rank: Contributor
timestamp: October 28, 2016, 12:35:30 pm
content: Hi,I am currently in the market for a new scope. I trained using Analog ones / HP first gen digital scopes in the early 90s.Now I am looking at getting one for hobby usages and am stuck looking at 2 of the Rigol scopes.https://www.rigol-uk.co.uk/Rigol-DS1102E-Digital-Oscilloscope-p/ds1102e.htm#.WBMu9y0rJhEhttps://www.rigol-uk.co.uk/Rigol-DS1054Z-Digital-Oscilloscope-p/ds1054z.htm#.WBNEJy0rJhFMy usage, initially (and probably for the next few years) is for 1-16Mhz Arduino logic circuit creation and debugging simple analog/digital circuits (think timers / amps / motor control boards / switch mode power supplys for Nixie tubes etc).I can afford around the £350 mark, but I would appriciate any suggestions or recommendations around which one would suit my usage.RegardsAndrew

author: nugglix
author_rank: Regular Contributor
timestamp: October 28, 2016, 12:37:28 pm
content: There are a lot of "I want a scope" threads around here.Just have a look.

author: Fungus
author_rank: Super Contributor
timestamp: October 28, 2016, 12:51:05 pm
content: The DS1054Z is aLOTbetter for that sort of work.More channels, serial decoders, bigger screen, lots more features, etc.It can easily be unlocked to 100MHz so don't worry about that difference.

author: wraper
author_rank: Unknown
timestamp: October 28, 2016, 01:00:39 pm
content: DS1102E is completely obsolete model.

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 28, 2016, 01:35:59 pm
content: definitely DS1054Z

author: AndrewNorman
author_rank: Contributor
timestamp: October 28, 2016, 01:38:51 pm
content: Quote from: nugglix on October 28, 2016, 12:37:28 pmI did and managed to get completely confused by all the information flying around ... but they managed to get me narrowed down to the two mentioned above.Quote from: wraper on October 28, 2016, 01:00:39 pmI didn't know that ... thanks for the heads-upQuote from: Fungus on October 28, 2016, 12:51:05 pmQuote from: Mechatrommer on October 28, 2016, 01:35:59 pmSounds like I will get a DS1054Z thenThanks Guys

author: picandmix
author_rank: Frequent Contributor
timestamp: October 28, 2016, 01:55:18 pm
content: Just make sure you buy from an authorised dealer, not the ebay cheapies where any warranty work may mean sending it back to China.http://www.rigol.eu/how-to-buy/
Detent Quadrature Encoders for DS1000Z - Page 1
Forum section: electronics / testgear

author: RoGeorge
author_rank: Super Contributor
timestamp: October 26, 2016, 01:56:12 pm
content: About a year ago I bought a DS1054Z Rigol scope. When hacked, DS1054Z is a very good bang for the buck tool, so I think is the best scope available for hobby use (only if you hack it, of course).Still, 4 out of the 6 panel rotary encoders are non-detent encoders, which is really frustrating during use. I have 2 questions:- Does all the DS1000Z scopes, including higher models and 2016 models, still have non-detent encoders?- Can anyone tell me where from I can bought 4 rotary detent encoders that can replace the original non-detent ones, please?I ordered some random detent encoders from AliExpress, but the mechanical dimensions are not the same:

author: Fungus
author_rank: Super Contributor
timestamp: October 26, 2016, 02:01:45 pm
content: There's at least one thread dedicated to this:https://www.eevblog.com/forum/testgear/rigol-ds1054z-rotary-encoder-mod/

author: RoGeorge
author_rank: Super Contributor
timestamp: October 26, 2016, 02:18:52 pm
content: Thank you, the thread you linked does contain a part number.I saw the thread before, but didn't noticed the part number until now.And the second question, does anyone who bought a DS1000Z recently can confirm that the DS1000Z still has non-detented encoders, please?

author: Dwaine
author_rank: Frequent Contributor
timestamp: October 26, 2016, 11:31:38 pm
content: Still undented encoder....

author: rstofer
author_rank: Super Contributor
timestamp: October 27, 2016, 03:46:43 am
content: All 4 of the small knobs have encoders without detents. The only one that matters is the upper left encoder when used for selecting items from a menu.

author: JPortici
author_rank: Super Contributor
timestamp: October 27, 2016, 05:47:40 am
content: decent user interface software would solve all of that without permanently voiding a warranty. but still..

author: metrologist
author_rank: Super Contributor
timestamp: October 27, 2016, 08:20:28 pm
content: Quote from: JPortici on October 27, 2016, 05:47:40 amA fifty thousand dollar UI it is not, but indecent? Seems usable to meI digress just a bit. The only thing that I wish it would do is not require me to push the button to make a selection, such as when scrolling the menu item.

author: JPortici
author_rank: Super Contributor
timestamp: October 27, 2016, 08:33:42 pm
content: i admit i may be too harsh, as it is full of programmers that have no clue on how to work with encoders, even on premium products. they either fuck up the acceleration (like in the rigol horizontal knob) or it is not implemented at all
User experience of the GW INSTEK GDS2204E - Page 1
Forum section: electronics / testgear

author: fishandchips
author_rank: Regular Contributor
timestamp: October 27, 2016, 04:54:51 pm
content: I am interested in the GDS2204E. Can users share their experience please?

author: nctnico
author_rank: Super Contributor
timestamp: October 27, 2016, 05:34:42 pm
content: Did you already read this thread?https://www.eevblog.com/forum/testgear/gw-instek-gds2204e-(200mhz-4-channel-dso)-review/
Strange offset in Fluke i410. - Page 1
Forum section: electronics / testgear

author: vini_i
author_rank: Regular Contributor
timestamp: October 25, 2016, 02:20:58 pm
content: I'm borrowing a coworkers Fluke i410 clamp on amp meter. The clamp has a strange offset that can't be zeroed out.Without the clamp connected to anything, both a Fluke multi meter and a Rigol scope show an offset between 250mV and 2V.This is too much offset for the knob on the from to zero out. Further some percussive maintenance causes the offset to jump around.Repeatedly turning the clamp on and off also can cause the offset to jump around. The other day the clamp was acting up but eventually started showing correctly.Today i can't get it to behave at all.The battery is brand new and reads 9.45v unloaded. I have not tried reading current with the clamp. It was calibrated in march of 2016 (sticker on the front).What could be wrong with it? Is this a know issue with these clamps? Is it repairable?

author: mos6502
author_rank: Frequent Contributor
timestamp: October 25, 2016, 09:35:50 pm
content: Maybe the ferrite got magnetized. Try opening the clamp and letting it snap shut a couple of times.

author: Jeroen3
author_rank: Super Contributor
timestamp: October 26, 2016, 05:37:08 am
content: If you've used it to measure high current DC pulses you might have magnetized it. Try some high current AC and it should recover.Or there could be debris preventing it from closing snugly.This works with our i30s at least.

author: vini_i
author_rank: Regular Contributor
timestamp: October 27, 2016, 04:40:03 pm
content: I opened up the clamp and took a look at the circuitry. The ON/OFF push button looked like the solder joints were cracked. I touched it up with a soldering iron. It works like a champ now.
34401a Bumpers & Handle - Original vs Chinese? - Page 1
Forum section: electronics / testgear

author: The Doktor
author_rank: Regular Contributor
timestamp: October 29, 2016, 07:32:30 pm
content: I'm trying to get the rubber bumpers and handle for my 34401a. I can get the complete set in Chinese version for under $30, is there any major difference that would make it worth getting original instead?

author: TheSteve
author_rank: Unknown
timestamp: October 29, 2016, 09:19:09 pm
content: You can tell the difference between the real and fake but the copy isn't too bad.

author: HighVoltage
author_rank: Super Contributor
timestamp: October 29, 2016, 11:13:38 pm
content: The Chinese rubber pieces indeed are OKBut the fake handle sucks, does not fit correctly and when you pull it apart to install it, it will not go back completely.I am staying with the original and just bought 10 sets
Manual/schematic for HP 6186C current source? - Page 1
Forum section: electronics / testgear

author: uoficowboy
author_rank: Regular Contributor
timestamp: May 23, 2013, 04:50:42 am
content: Hi - I am looking for a manual and schematic for the HP 6186C. I found this:http://cp.literature.agilent.com/litweb/pdf/06186-90005.pdfbut the schematic is really hard to read, so I'm hoping for something cleaner/higher resolution. Anybody got anything?On a side note - I have this device being sent to me shortly. I think it'll be a fun toy!Edit: I could also really use a service manual/schematic for the Fluke 2625A...

author: guenthert
author_rank: Frequent Contributor
timestamp: October 25, 2016, 05:48:40 am
content: Perhaps a bit late, but it might be of interest to others who stumble across above. I found also a hard-to-read operational manual, but then also the service manual (which also includes the schematics) in much better quality athttp://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/HP%206186C%20Operating%20&%20Service.pdf-- Ah, strike that. There's only the simplified schematic, the detailed one (figure 7.4) is missing. Which is a pity, as the error amplifiers are built from discrete transistors and I'd like to have a close look on how that's done.How's the supply working out for you? Do you got pictures? Use cases?
Siglent 2112 Dimensions (without the handle) - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: October 18, 2016, 04:28:45 pm
content: The data sheet for the SDG2112 indicates 260mm for width. I'm assuming this is with the handle and bumpers?I have a fair bit of HP and Agilent gear that is all uniform in width at about 210mm width for the actual case, so they all stack nicely together without a bunch of wasted space,Can anyone tell me the width of the Siglent without the handle?

author: DaJMasta
author_rank: Super Contributor
timestamp: October 18, 2016, 04:33:57 pm
content: My SDG2082X is 260mm including the tilting bail, 227mm with the bumpers, and looks like about 206mm for just the metal chassis - though the faceplate sticks out a bit to about 213mm.

author: Jester
author_rank: Frequent Contributor
timestamp: October 19, 2016, 02:43:17 pm
content: Quote from: DaJMasta on October 18, 2016, 04:33:57 pmThanks for that, so same as the regular HP/Agilent 1/2 rack equipment. (Somebody had their thinking cap on)The 2112 is now at the top of my short list.

author: Lunasix
author_rank: Regular Contributor
timestamp: October 24, 2016, 02:32:16 pm
content: Hi,I don't know for the 2112, but the 2042 has fan input and output on the left and right sides. If you stack it without any space, it will probably overheat.

author: Jester
author_rank: Frequent Contributor
timestamp: October 24, 2016, 03:14:12 pm
content: Thanks, I noticed the side cooling vents, If I get one it will have to go on top of the stack
CMU200 tracking generator? - Page 1
Forum section: electronics / testgear

author: dcarr
author_rank: Regular Contributor
timestamp: May 21, 2015, 06:28:19 pm
content: Question for those with a R&S CMU200:The CMU200 has a signal generator that covers the full range of the unit. Can it be configured to act as a tracking generator for the spectrum analyzer? I can't find this in the operation manual if it can.Thanks,David

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: May 26, 2015, 09:36:36 pm
content: Quote from: dcarr on May 21, 2015, 06:28:19 pmNo, it can't.The generator can't sweep, and there's no functionality to track the spectrum analyzer frequency window.In theory you could connect the CMU200 to a PC via serial/GPIB, and write a program that steps the generator through the bandwidth you want, but considering that the generator needs some time to stabilize after each frequency change (as well as the time needed for the SA to record the signal) this will be painfully slow.

author: dcarr
author_rank: Regular Contributor
timestamp: May 26, 2015, 10:00:31 pm
content: I've done some testing since I first asked this question and my results closely mirror your comments. Here are my measurements:- Over serial at 115200 baud, generator can be tuned to 20 frequencies/sec.- Same test + taking a power measurement: 15 frequencies/sec.This could work, but it's definitely not real time.David

author: _Wim_
author_rank: Super Contributor
timestamp: October 04, 2015, 09:44:41 am
content: Quote from: dcarr on May 26, 2015, 10:00:31 pmWould you mind posting some code for this? I would like to give this a go also...

author: danielg
author_rank: Contributor
timestamp: October 24, 2016, 10:08:36 am
content: Quote from: _Wim_ on October 04, 2015, 09:44:41 am
Tek TDS7704B APP 54 - what is it? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: October 23, 2016, 11:11:45 am
content: Does anyone know what "APP 54" is on a TDS7704B? For that matter, is there a list of the apps by number for the TDS7000 series available somewhere?Unless the application is installed, I don't see any way to determine what each one is.Thanks.
Logging measurement data via GPIB without using PC? - Page 1
Forum section: electronics / testgear

author: e-doc
author_rank: Contributor
timestamp: September 15, 2016, 04:17:03 pm
content: I want to make a longtime record from 3458A measurements without using a PC (to save some energy).I suspect this 3458A to drift over time much more than specified.Can I use a raspberry or equivalent with GPIB interface?Anybody tried to go this way?

author: TiN
author_rank: Super Contributor
timestamp: September 15, 2016, 06:16:38 pm
content: QuoteYour assumption is not correct, unless your 3458A is faulty (has unstable drifty ADC).I'd expectthis articlecan get you started. If you have not set your Raspberry Pi with GPIB, you can referencethis for NI USB-GPIB-HS dongleorthis for Agilent/cloned 82357A/Bone. You may also enjoy logging environmental data together with your samples by adding something likeBME280 sensor for your Pi.With fair bit of patience, you can end up with live data logging, similar to like what I'vegot.

author: carl_lab
author_rank: Frequent Contributor
timestamp: September 15, 2016, 06:30:18 pm
content: Quote from: TiN on September 15, 2016, 06:16:38 pmThat's exactly, what I suspect: the 3458A maybe defective.

author: zlymex
author_rank: Frequent Contributor
timestamp: September 16, 2016, 10:53:03 am
content: Yes, off-line recording from 3458A GPIB is quite possible. I have two pieces of gear that accept memory card and run standalone.Edit: I got them from 38hot:http://bbs.38hot.net/forum.php?mod=viewthread&tid=7565http://bbs.38hot.net/forum.php?mod=viewthread&tid=115514

author: e-doc
author_rank: Contributor
timestamp: September 20, 2016, 02:59:26 pm
content: Quote from: zlymex on September 16, 2016, 10:53:03 amInteresting.Unfortunatelly I can't read chinese...What's the price for one unit?

author: HighVoltage
author_rank: Super Contributor
timestamp: September 20, 2016, 03:06:27 pm
content: Quote from: zlymex on September 16, 2016, 10:53:03 amWhere did you buy these and how much are they?Very interesting!

author: zlymex
author_rank: Frequent Contributor
timestamp: September 20, 2016, 03:20:37 pm
content: Not expensive at all, the second one(the larger one, and also the newer one with more functionality) cost 195 RMB, which equivalent to 30 USD, exclude p&p.However, that thread is more than one year old, I don't know when or if the next batch will come.Edit: I bought or given those in China, that could be problematic for shipping to or receiving money from outside China. I'll contact the author to see if he can be of any help.

author: plesa
author_rank: Frequent Contributor
timestamp: October 24, 2016, 07:49:04 pm
content: Quote from: e-doc on September 15, 2016, 04:17:03 pmI'm using the RPI2/3 with NI USB GPIB HS with Raspbian and Python scripts for data logging - it works like charm.Apache webserver is used for live piloting data like TIN has on his website. This use D3.jshttps://d3js.org/, it is much more faster than over internet.ProFTP installed for ftp access, Screen so attaching and detaching screen and keeping Python script running in background.
male unshrouded bannana to female shrouded bannana? - Page 1
Forum section: electronics / testgear

author: sycho123321
author_rank: Regular Contributor
timestamp: December 06, 2015, 02:06:05 am
content: Does an adapter like this exist? I want to use new shrouded probes with an old bench multimeter. If someone knows a link to one that would be great.Thank you!lukas

author: PedroDaGr8
author_rank: Super Contributor
timestamp: December 06, 2015, 02:22:52 am
content: Quote from: sycho123321 on December 06, 2015, 02:06:05 amFranky on here ( username iloveelectronics) sells them.This is his eBay store and a link to said item. Sorry for the mobile link but I'm on my phone.http://m.ebay.com/itm/200904597758?_trksid=p2056016.l4276&_mwBanner=1If you contact him on here, he can usually knock a small but off the price due to the lack of eBay fees.Sent from my LG-ls990 using Tapatalk

author: sycho123321
author_rank: Regular Contributor
timestamp: December 06, 2015, 02:31:22 am
content: thanks. that is exactly what i neededLukas

author: TomB19
author_rank: Contributor
timestamp: October 21, 2016, 12:51:54 am
content: I needed a pair of these and franky is out.In case someone else is looking for these, I found a second source on AliExpress.https://www.aliexpress.com/item/CP456-4mm-Banana-shrouded-to-4mm-unshrouded-plug-female-male-converters-Adapter/2033315377.html

author: commongrounder
author_rank: Frequent Contributor
timestamp: October 21, 2016, 04:44:35 pm
content: Mueller Electric makes these as well for under $4.00 US in black and red. The catalog # is BU-32101-0 for black and -1 for red. I have a few sets of these and they make my shrouded banana test leads very much more useful. I purchased mine in the US from Newark.

author: mos6502
author_rank: Frequent Contributor
timestamp: October 21, 2016, 08:32:11 pm
content: Or just buy test leads with retractable shrouds like Pomona 6358. Or buy a set of plugs like these and slap them on a pair of test leads of your choice:http://www.hobbyking.com/hobbyking/store/__77408__4_0mm_Banana_Safety_Plug_Kit_4pc_EU_Warehouse_.html
Keithley TSP script to communicate between 2 SMUs - Page 1
Forum section: electronics / testgear

author: Circuitous
author_rank: Unknown
timestamp: November 18, 2015, 03:16:02 am
content: I was looking for a general example of having two SMUs running a script and communicating, but I haven't found anything like that.Anyone have an example?My initial need is to run a TSP script on my 2450 and have it trigger or communicate with a script running on a DMM7510.The data queue and notify trigger functions look like they would be useful for communicating between TSP capable units, but I haven't found any examples using them.I saw the video Shahriar did with 2 2450's communicating, but he didn't provide any code for the script... that would be exactly what I need!Any help is appreciated.

author: scriptsForLife54
author_rank: Newbie
timestamp: October 20, 2016, 11:15:15 am
content: CircuitousDid you ever get any feedback on this? If not, please indicate some other details about what you would like each/both SMUs to do. I may be able to share something with you.BestscriptsForLife54

author: Circuitous
author_rank: Unknown
timestamp: October 20, 2016, 09:55:03 pm
content: I did get a little feedback from a Keithley field engineer, and then I managed to get a script working across the 2450 SMU and DMM7510.I did a video of it here:

author: Circuitous
author_rank: Unknown
timestamp: October 20, 2016, 09:57:38 pm
content: However, I would be happy to see more about scripts.I have added a Keithley 2460 SMU, and I would like to be able to load the script into one SMU and have it transfer any child scripts to the other SMU or the DMM. As it is now, I have to manually load each device with the necessary scripts, and then the SMU running the main loop calls scripts on the other units.
Q: Manufacturer for Connector used on Weller hot air rework stations - Page 1
Forum section: electronics / testgear

author: rbm
author_rank: Regular Contributor
timestamp: October 19, 2016, 10:45:59 am
content: Hi, Does anyone know the manufacturer and/or connector series used by Weller on their hot air rework stations like the WRS 1002 / WAD 101 to connect the HAP1 tool to the unit? It's a 7 position circular connector with bayonet capture ring, similar to audio style connectors.

author: anotherlin
author_rank: Frequent Contributor
timestamp: October 19, 2016, 10:57:43 am
content: I'm pretty much sure they are amphenol DIN connectors, I don't know the exact ref.http://www.mouser.com/ProductDetail/Amphenol-Tuchel/T-3487-009/?qs=U9djQns6NAoAqOyhSkYP1A%3D%3DClick on the pdf datasheet, it will list the complete catalog with complete drawings and dimentions

author: rbm
author_rank: Regular Contributor
timestamp: October 20, 2016, 12:21:14 am
content: Quote from: anotherlin on October 19, 2016, 10:57:43 amThanks very much for replying. I reviewed the datasheet for the Amphenol C091B series. Comparing the drawing in the spec sheet to my mating receptacle, the locating lug is in the wrong position on the DIN plug, so I believe those connectors wouldn't fit. They don't match IEC 60130-9 pin layouts either. Maybe these plugs are proprietary to Weller. I'll try and contact Weller to ask the question.

author: anotherlin
author_rank: Frequent Contributor
timestamp: October 20, 2016, 11:06:10 am
content: They look very similar with those amphenols.Yet they have good reason to make their connectors proprietary, so you can't use your weller iron with anything else than weller's stations.
Recommendation needed for power supply - Page 1
Forum section: electronics / testgear

author: Boomerang
author_rank: Regular Contributor
timestamp: October 11, 2016, 08:46:22 am
content: Hello,I need bench power supply to test my devices for power consumption because they will work from batteries. I don't have the need for high voltages or currents. What I need is the ability to accumulate consumed current and power (voltage * current) for long periods. I want to see total mAh and total mWh after I reset the accumulated measurements.What you can recommend me?Thanks!

author: R005T3r
author_rank: Frequent Contributor
timestamp: October 11, 2016, 11:33:49 am
content: Budget?

author: Boomerang
author_rank: Regular Contributor
timestamp: October 11, 2016, 11:40:08 am
content: Maximum €600 - €700 (brand new price), but I hope there is something that will do the job at a fraction of this price!

author: Boomerang
author_rank: Regular Contributor
timestamp: October 11, 2016, 11:46:42 am
content: @omgfire:Do you have experience with this?

author: R005T3r
author_rank: Frequent Contributor
timestamp: October 19, 2016, 11:44:43 am
content: Quote from: Boomerang on October 11, 2016, 11:40:08 amThe instrument that may fit your needs is the Rigol DP711. It's a 30V 5A it's a PSU with power measure capability. It's around $300. But be careful: there may be problems with it.The only downside is that it has only two decimals, so you probably won't be able to measure standby power consumption accurately or in some cases at all...If you need more precision for measuring standby power consumption and all sorts of these measurements, you need to go up in price, and Keithley may be a good brand to consider: the software is good and intuitive. It can log things for days and you can export datas to excel and do things like that. Moreover there are PSU with a 0,1 mA resolution, which is very good for that application! The only downside is that's more expensive (generally you go up at $1.1-1.2 K), but in case your products are very expensive don't do the mistake to put gear price above all: I know it sucks, but it's not worth running the risk, because I know of a business being literally failed because of the wrong gear investment.In case you don't know, Keithely gears can be configured and personalized to meet your specific needs.

author: mos6502
author_rank: Frequent Contributor
timestamp: October 19, 2016, 12:02:09 pm
content: You haven't specified your required accuracy, so any recommendations are going to be a crap shoot. Anyway, one simple solution would be to use two logging multimeters, maybe process the data a bit using a perl script and feed it into Gnuplot or a spreadsheet program for visualization. Another option would be the Mooshimeter, which can measure voltage and current simultaneously, log it to an SD card and also send the data in real time to your computer or phone:https://moosh.im/mooshimeter/One definite advantage of the Mooshimeter is the high res DAC, which means it can measure microamps to amps using the same jack, without even switching ranges or anything.
Speed Bump - Arbitrary Waveform - Page 1
Forum section: electronics / testgear

author: rstofer
author_rank: Super Contributor
timestamp: October 18, 2016, 09:11:44 pm
content: I am thinking about buying an AWG but I am still vacillating on the upper frequency limit. I liked the comparison video covering the Rigol DG4162 and the Siglent SDG5162 but I suspect both of them reach into frequencies about which I simply don't care. 100 MHz is more than enough and, truth be known, 50 MHz will probably be more than adequate. More thought required...However, my primary reason for thinking about an AWG is to generate very low frequency signals to use as inputs to an analog computer (real time). Consider the regular traffic speed bump. I figure a ramp up, hold, ramp down type of pulse would probably be about right and looking at 30 MPH, maybe such a pulse is 50 ms wide. But the suspension response may be two or three seconds before it is done oscillating (I haven't calculated this for any realistic model nor am I prepared to consider all 4 wheels and the cross-coupling). Is it possible to generate such a low frequency, low rep rate pulse with these AWGs? Maybe it would be nice to generate a long stretch of road with chuckholes and perhaps some washboard effect. So, MS/s isn't very interesting, low hundreds are probably adequate but the total duration needs to be quite long.I suspect these waveforms are better generated by a uC with an SD card but I'm still thinking that the AWG would be a more interesting tool.

author: nctnico
author_rank: Super Contributor
timestamp: October 18, 2016, 09:22:48 pm
content: Ofcourse you can create low frequency signals BUT the biggest limitation will be sample memory. What you likely want is an AWG in which you can use segments of memory and repeat these like 10x segment one, 2x segment two, 1x segment one, 5x segment four, etc. It is kind of like segmented memory in an oscilloscope but then reversed to output signals.

author: rstofer
author_rank: Super Contributor
timestamp: October 18, 2016, 10:02:57 pm
content: So 10x level road, 1x speed bump, etc.That's a great idea! Now to search for such a thing.

author: nctnico
author_rank: Super Contributor
timestamp: October 18, 2016, 10:12:40 pm
content: Segments is a feature you'll find on a real AWG but the definition of an AWG got a bit garbled by the more recent digital function generators which have a piece of RAM they can dump into the DAC and call it AWG (say a checkbox feature).
Need Help with LeCroy WaveRunner Xi Scope - Page 1
Forum section: electronics / testgear

author: RCHRDM
author_rank: Regular Contributor
timestamp: October 18, 2016, 07:56:59 pm
content: I have a WaveRunner 44Xi-A and am doing backup/restore of the hard disk. I am also curious about how calibration is done on this type of scope.Richard
HP 141T spectrum analyzer display section calibration tutorial - Page 1
Forum section: electronics / testgear

author: JLNY
author_rank: Regular Contributor
timestamp: October 18, 2016, 03:04:28 am
content: Hello all,I have spent a fair amount of time working on several of these units and fixing them up, and I was surprised to see how few repair and calibration tutorials there are online for these units given how common they are. I'm probably going to regret this, but I thought that I would add to the knowledge base by sharing what little I know about calibrating and repairing these units. For anyone interested, I have uploaded a 5-part tutorial where I go through and calibrate a 141T (just the display section for now. I may do videos on the individual types of plugins later). The display sections are usually the parts that tend to fail or need the most adjustment, so I thought I would mainly focus this and on the parts that I have seen fail most often.Normally, I would prefer to do text-based posts about this kind of thing, but a video really seemed necessary to explain this. This is unfamiliar territory for me, and I'm afraid it really shows. Hopefully enough folks can endure my stammering and terrible editing skills long enough to get some useful information from these videos.At the moment, I just have the videos as unlisted so that folks here can review them and let me know what they think. Informative? cringeworthy? does it need corrections? I only know a little bit about these units, so I would really like to hear from folks and get their thoughts and repair notes on these units. If it turns out that there are significant issues with these videos, I can basically use this video as my "dry run" for a better video.Full 5-part playlist here:/watch?v=mFf51gsTmR4&list=PLO73EkAo5KjWdD8rH8nTnV2nBp70HqSQX
Ground spring for Rigol RP3300A (2.5mm) probe - Page 1
Forum section: electronics / testgear

author: npelov
author_rank: Frequent Contributor
timestamp: October 17, 2016, 03:46:09 pm
content: Hi,I lost my ground springs (well I have one) and I want to find replacement. I checked in local rigol representative - 5 pcs cost 27 EUR. I contacted rigol directly - they charge 15 EUR +shipping for 5. If someone have seen what the ground spring looks like, he would know why I'm not willing to pay that much for it. It's not gold plated or something fancy. Just a spring that's similar to a spring in a pen (well maybe there is nickel coating or something). It's not that big deal if I pay 30 EUR, but I don't like to be robbed.So my question is did someone find a good replacement alternative for the 2.5mm ground springs.I tried copper wire, but it's too flexible.Here is a photo of probe + accessories:
HP 8568A Spectrum Analyzer display fault. - Page 1
Forum section: electronics / testgear

author: Simon Spiers
author_rank: Regular Contributor
timestamp: October 17, 2016, 08:19:55 am
content: Hi all, wonder if you can help>I have just moved my 8568a from one side of the workshop to the other and now it has a problem.When the unit has been on for a while the CRT starts to show scrambled characters and the graticule seems to vanish.I have been over both units cleaning edge connectors and checking ESR of the tant caps but still no joy,It also shows the check instrument 1 led one this fault starts. Which is instrument 1?The actual waveform displayed looks un corrupted, so I am guessing the fault must lie in the display units character generation section?Any ideas please.Simon

author: rob.manderson
author_rank: Regular Contributor
timestamp: October 17, 2016, 12:35:40 pm
content: Hi Simonthe instrument check leds don't directly correspond to display/rf unit in the way you're asking. I just checked in my manual and Instrument 1 corresponds to a digital display failure. Their instructions are to check the bus interconnect cable (the 50 pin one). I had a connector failure on mine - I found that using a very fine pair of tweezers to push the edge connectors out slightly resolved a lot of intermittents. (I'm referring to the end that plugs into the RF section (bottom section)). If you remove that end of the cable you should see what I mean. In the end I bought a 50 conductor DB50 printer cable and a replacement Amphenol connector and rebuilt the cable from scratch.Even though you have an 8568A I highly recommend the Artek manual set (US$20) for the five manual set. I'd ask if they have the 8568A RF section. The only difference is that the 8568A has the older HP proprietary processor whereas the 8568B has a Motorola 68000 processor (and of course all the changes that entails) but it's all confined to the processor section - all the interesting bits, RF, are the same.
USB to RS232 converter Prolific Driver saga - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: October 16, 2016, 02:39:02 pm
content: Yesterday I purchased a USB to RS232 converter from a local electronics retailer. Upon installation (Win7) device manager flags the driver as bad with the yellow!Device status is reported as "This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)"The VID and PID indicate Prolific USB-to Serial Comm Port 067B & 2303Windows has installed driver version 3.8.1.3My best guess is that the hardware is either old or using a cloned Prolific chip. See:http://www.totalcardiagnostics.com/support/Knowledgebase/Article/View/92/20/prolific-usb-to-serial-fix-official-solution-to-code-10-errorThe device came with a DVD with about 20 different drivers, however Windows refuses to install these older drivers, instead installing version 3.8.1.3 (05/07/2016) and stating The best driver software for your device is already installed, ignoring the supplied drivers even when I select them for installation.Is there away around this or do I need to return it and try another vendor?

author: quinty
author_rank: Newbie
timestamp: October 16, 2016, 06:52:29 pm
content: Hi,if you bought it from aliexpress/ebay at very low price than it's fake chip for sure.Same may appear when buy FT232R.But it's no problem because to solve this You must install older version of driver. Go to device manager, then manually click "update", and point to .inf file by hand.Check attachment, I'm using this version.

author: Jester
author_rank: Frequent Contributor
timestamp: October 16, 2016, 07:27:27 pm
content: Quote from: quinty on October 16, 2016, 06:52:29 pmPerhaps that method worked in the past, but the Win7 version I'm running refuses to install any version except the latest, it simply reports" The best driver software for your device is already installed"

author: TheSteve
author_rank: Unknown
timestamp: October 16, 2016, 08:23:18 pm
content: Return it. It is possible to get it working but it will be a pain.

author: oPossum
author_rank: Super Contributor
timestamp: October 16, 2016, 08:32:41 pm
content: Uninstall the current driver first.

author: Jester
author_rank: Frequent Contributor
timestamp: October 17, 2016, 10:53:42 am
content: Finally got it working through a combination of using admin rights and using the uninstaller in my original post. Entirely possible Windows will update the driver in the future and kill it so for the record the working version is 3.8.13 dated 05/07/2016, which is odd as this is a much newer driver.