hybridfree/eevblog-posts huggingface dataset:
How to grease rheostat and variac? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: May 08, 2018, 04:44:47 pm
content: I got few old oxidised rheaostats and variacs from 1950-60thWhat I must do first to use it?Any hints?What grease will be ok?Thanx!

author: helius
author_rank: Super Contributor
timestamp: May 08, 2018, 04:59:52 pm
content: If you clean out any old grease from the shaft bearing, it should be fine with white lithium grease or anything else you have on hand. This is not a high-load application.For the contact surface between the winding and the brush, you should be careful not to contaminate it with grease as that will gum up the brush. You can use alightlubricant such as FaderLube or MG Chemicals 801B but it doesn't take more than a tiny amount.

author: oldway
author_rank: Super Contributor
timestamp: May 08, 2018, 05:59:29 pm
content: For the variacs, you can lubricate the mechanical parts but NEVER the brushes and the copper winding.The brushes are made of graphite which is a lubricant itself.

author: BravoV
author_rank: Super Contributor
timestamp: May 08, 2018, 06:39:26 pm
content: Quote from: oldway on May 08, 2018, 05:59:29 pm+1 , only mechanical EXCEPT the exposed copper winding and the graphite brush contact that touching the copper.For the exposed copper at the winding, if its too dirty or the oxidized copper is too thick, you can use a common rubber eraser for pencil to slowly & gently rub the exposed part, it takes time and it will clean them nicely. And do not touch as the grease from your finger will contaminate it.Also DO NOT forget to blow off all those rubber pieces and make sure they're all gone completely once you finished.I repaired & restored a Japanese variac while ago, bought used and lubricate all mechanical parts as they squeaked, and cleaned the copper using rubber eraser as above, now it works flawlessly and like new.Few photoshots of mine when I tear it down, the black colored surface on the exposed copper actually was made by material transferred from the brush tip graphite material, and its fine & normal if it looks like that. Also its a mistake expecting to see it shine like buffed copper, as once the brush wipe that, it will turn black again and that black film will act like dried lubricant.

author: janoc
author_rank: Super Contributor
timestamp: May 08, 2018, 06:39:46 pm
content: Quote from: oldway on May 08, 2018, 05:59:29 pmWell, you can clean them and lubricate them using the purpose-designed products, such as this:https://www.amazon.fr/gp/product/B000WFZLRU/ref=oh_aui_detailpage_o03_s00Or, if it is really graphite, then specialized products for audio faders.

author: 001
author_rank: Super Contributor
timestamp: May 09, 2018, 02:48:57 pm
content: Thanx a lot!And how to clean and grease wirewound rheostat? It looks dark
50ghz 200ks/s ?? - Page 1
Forum section: electronics / testgear

author: 5282
author_rank: Regular Contributor
timestamp: May 04, 2018, 07:20:12 am
content: Tektronix 11801Bthis scope will make me crazy it's 50ghz with 200-kS/s Sample Rate onlyhow how

author: riyadh144
author_rank: Unknown
timestamp: May 04, 2018, 07:22:35 am
content: WTH, I want to know how are they doig that, are they using a raspberry pi

author: poorchava
author_rank: Super Contributor
timestamp: May 04, 2018, 07:27:39 am
content: Equivalent time sampling?

author: helius
author_rank: Super Contributor
timestamp: May 04, 2018, 07:47:51 am
content: Tektronix had a long history of sampling scopes, beginning with the Type N plug-in for the 500 series (vacuum tube scopes) in 1964, which had over 1 GHz bandwidth (rise time of 0.6 ns). These sampling tools long preceded digital oscilloscopes, which really were not a thing until LeCroy's first products in the 1980s. The 11801B is a later outgrowth of this history in 1994. It was a very expensive device, but probably not very useful for most electronics outside of microwave design. You do not simply plug a 10X probe into the scope, you must use special sampling heads (part of the Tektronix S series) with integrated cables. The system was also capable of TDR measurements with the appropriate sampling heads.

author: David Hess
author_rank: Super Contributor
timestamp: May 04, 2018, 06:52:51 pm
content: Usually these oscilloscopes use sequential equivalent time sampling but the Tektronix 3T2 and 7T11/7T11A also supported random equivalent time sampling.Sampling oscilloscopes have their limits compared to real time and digital storage oscilloscopes but they are invaluable where high bandwidth and overload recovery are important. Below is an example of TTL pattern dependent jitter which I made using my 14GHz 50kS/s 7T11A sampling oscilloscope which is completely invisible on a 500 MHz oscilloscope and this is an order of magnitude slower than my sampling oscilloscope will support; the entire area of interest is less than 1 nanosecond wide.
8 channel analog data recorder that works with iPad? - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: May 03, 2018, 09:16:45 pm
content: I do some hobby drag racing in my spare time and use a Dataq DI-148U to record analog data during the race for analysis after the event. The setup tucked up under the dash consists of a pico ITX PC, external display, mini keyboard etc. Too much stuff!I would like to replace all the PC stuff with an iPad, unfortunately the Dataq software only runs on a PC.Are there any cheap ($100 or so) mini data recorders that work with an iPad?The Dataq provides 8 analog channels, and I use all of them.

author: DaJMasta
author_rank: Super Contributor
timestamp: May 04, 2018, 03:31:36 am
content: Would an older laptop/tablet PC do the job? There may also be something that works on an iPad, but you could probably keep all your current setup in terms of software and save format if you just bought a used laptop or something.

author: Jester
author_rank: Frequent Contributor
timestamp: May 04, 2018, 04:03:57 am
content: Quote from: DaJMasta on May 04, 2018, 03:31:36 amLaptop with a hard drive does not work, the G-Forces crash the hard drive, SSD works (that's what I'm using now).I might look at Windows based tablets like the surface Pro.
Hakko 936 chinese knockoff power supplies - Page 1
Forum section: electronics / testgear

author: sh590
author_rank: Newbie
timestamp: May 07, 2018, 09:55:05 am
content: Hello,I've been looking for a cheap 936 soldering station on Ebay and I've noticed some of the soldering stations operate in 110V and 220V.For example -https://www.ebay.com/itm/936-Power-Electric-Soldering-Station-SMD-Rework-Welding-Iron-110V-220V/401205182210?epid=2115429791&hash=item5d69b13f02:g:~B0AAOSwYIxX~KjzAs I understand, this means that the PSU inside is switched-mode power supply as opposed to the PSU inside the original Hakko 936.This raises a lot of questions to meWhy the original Hakko didn't use switched-mode? It's smaller and lighter isn't it?Does this mean the Chinese soldering iron uses DC instead of the 24VAC?And most importantly - Is there a reason to prefer a lenear PSU even if it costs more?
Keysight U1282A LCD contrast issue with backlight on  - Page 1
Forum section: electronics / testgear

author: RoadRunner
author_rank: Frequent Contributor
timestamp: May 02, 2018, 08:35:41 pm
content: i have just got U1282A , when comparing to my old U1272A i see LCD contrast is really poor at low, high and side viewing angle. I see issue only when backlight is on, things seems to be fine without backlight.i have attached three images to show how contrast changes depending on angle. although photos don't show properly but U1272A holds contrast perfectly.Can some of U1282A owners please share there experience. i just wanted to know if it is only with my unit or it this normal behavior for U1282A.Any help will be appreciated.Thanks.

author: threephase
author_rank: Regular Contributor
timestamp: May 02, 2018, 09:14:09 pm
content: Hard to tell precisely from the photos but it looks similar to my unit.Kind regards

author: RoadRunner
author_rank: Frequent Contributor
timestamp: May 02, 2018, 09:18:42 pm
content: Quote from: threephase on May 02, 2018, 09:14:09 pmThank you for quick reply , i would say result is quite the same. blacklight is a bummer , in ambient light every thing is fine

author: bitseeker
author_rank: Super Contributor
timestamp: May 03, 2018, 12:34:32 am
content: I get similar results, so it's not anything particular to your meters. From the bottom, the 1282 has a bit less contrast than the 1272 at the same angle. From the sides, though, the 1282 has significantly faster drop in contrast than the 1272.However, in practice I hadn't really noticed it. I guess it's just reflex to either move the meter or my position.
Agilent Infiniium 5483X and Motorola VP22 motherboard (also 16800-900 Logic An.) - Page 1
Forum section: electronics / testgear

author: croma641
author_rank: Regular Contributor
timestamp: April 30, 2018, 11:52:48 pm
content: Hi,I've bought weeks ago an Agilent 54831B with a Windows 98 original recovery disk and a problematic mainboard.After long tests, it seems to work, but, probably, the mb. have lost portions of his OEM BIOS (Agilent) modifiable area (4 mbit, 512 kbit firmware hub, 49lf004a).Probably the old firmware flash had a problem during an ex owner OS update ..In effect, the agFilterInstaller.exe (Pcifilter directory) doesn't work anymore: the driver doesn't find the TI 2031 PCI to PCI bridge card (upper acquisition card)Can anyone send me a working VP22 BIOS image (any VP22 548xx BIOS) ?If not, I can be interested also in the "sister" motherboard BIOS, the ADLINK M-815E.thanks in advance !

author: zitt
author_rank: Regular Contributor
timestamp: May 01, 2018, 09:38:28 pm
content: Can't help with the bios.However, you should research volume oem licensing on google. I can't provide direct links as I'm at work and not a good idea to research that stuff on a corp network.VLKs are pretty well documented as are the grub installers which fake it.I imagine someone (not me; as I don't have the scope anymore) could get the VLK information from their motherboard to enable you to fake the image.

author: free_electron
author_rank: Super Contributor
timestamp: May 01, 2018, 09:49:29 pm
content: These boards die because of the pci-pci brbrdige chip desoldering itself from the motherboard. squirt it with liquid flux and reflow it.

author: gslick
author_rank: Frequent Contributor
timestamp: May 02, 2018, 05:39:40 pm
content: Quote from: croma641 on April 30, 2018, 11:52:48 pmWhat could you do with the BIOS for a different motherboard? The title of the thread also mentions the 16900A. I have a bare ADLINK M-815G motherboard from a 16900 which has an SST49LF004B in a 32-pin PLCC socket that I could extract and dump with my device programmer. Don't know how that would help you though.Also, as far as I know there are strings in the BIOS which are customized for the specific products which use the same motherboards. So for example a scope and a logic analyzer could have different product identification strings in the BIOS for otherwise identical motherboards and the restore disks will normally only restore on a motherboard with the expected identification strings. There are ways to get around that though.

author: croma641
author_rank: Regular Contributor
timestamp: May 02, 2018, 09:44:24 pm
content: "as far as I know there are strings in the BIOS which are customized for the specific products"Yes, I think that the difference is between the PCI to PCI bridges used in the upper acquisition card (and between the motherboards of course).Mine uses a PCI2031 chip, other a PCI2050 chip.. BIOS provides the identity to this card and have of course the Slic Windows licence...Having the mb. original BIOS and the related Agilent modified BIOS I can reconstruct my workingsystemObviously the preferred methos is to get the right Agilent BIOS upgrade disk.
Difference Between Simpson 260-9SP & the 260-9S - Page 1
Forum section: electronics / testgear

author: SG-1
author_rank: Regular Contributor
timestamp: May 02, 2018, 04:31:27 am
content: Does anybody know what the difference is between the Simpson 260-9SP & the 260-9S ?The instruction manual is the same for both instruments & the S seems to stand for the electronic protection circuit for the movement. There is a about a $70 difference in the price.Section 1.2 of the manual covers the protection circuit.https://assets.tequipment.net/assets/1/26/Documents/Simpson/260_9SP/260_9sp_doc_2.pdf

author: BravoV
author_rank: Super Contributor
timestamp: May 02, 2018, 04:33:08 am
content: Have you check here ? ->http://simpson260.com/

author: Gregg
author_rank: Super Contributor
timestamp: May 02, 2018, 04:57:49 am
content: I believe the Simpson P indicated a quick trip re-settable breaker; a small extra button on the front panel.

author: kj7e
author_rank: Frequent Contributor
timestamp: May 02, 2018, 05:23:37 am
content: The manual posted by the OP has a typo,"1.2 Overload Protection (9S Version)", should read "1.2 Overload Protection (9SPVersion)".The 'S' means Cat 3 to 600v, the 'P' means overload protected.
Bad solder joint caused Rigol DS1054z button lights to randomly blink - Page 1
Forum section: electronics / testgear

author: urill
author_rank: Contributor
timestamp: May 01, 2018, 03:02:20 am
content: I bought this ds1054z two years ago. I started to see the weird button led behavior coincidentally after a firmware update and posted about it in the firmware thread. The problem was intermittent.I tried to claim warranty, but rigol insisted that I had to pay the shipping.Now the warranty lapsed and the frequency of the problem became unbearable. I opened it and found a solder ball that shorted two pads on the button board. The solder joints looked sad. The board had flux residue smeared all over. I resoldered the flat flex cable and fixed the problem.I hope this post will help someone else with a poorly soldered button board flat flex.
Agilent N9310A Rf sig gen.  Faulty & beyond economic repair by Keysight - Page 1
Forum section: electronics / testgear

author: Oldtestgear
author_rank: Regular Contributor
timestamp: April 30, 2018, 04:57:50 pm
content: Not sure where to put this, so apologies if I am completely wrong.I have an N9310A in nice cosmetic condition that is faulty. The attenuator seems to be the culprit. At -30dBm & below it is absolutely fine. At 0dBm the output is actually -50dB. Keysight estimate the cost of repair at £4500. Probably because the RF module is quoted as "obsolete".So not worth paying for the repair but possibly repairable if someone has a faulty display or mainboard. I am open to any suggestions as to the best way forward. I will sell it if someone needs parts or buy a working RF module if someone has one they want to sell. Any option can be discussed that means a machine can be got working again.Thoughts / Ideas /comments?Phil

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 30, 2018, 05:08:52 pm
content: picture? is it mechanical attenuator? or 4mm by 4mm chip attenuator? different type different advice... how much are you willing to sell as faulty? if the price is right, someone here will grab it pretty quick..

author: DaJMasta
author_rank: Super Contributor
timestamp: April 30, 2018, 05:29:38 pm
content: Sounds like their repair being offered is just a replacement unit. It sort of reads as just a venting post, I don't think that it's actually going to be repairable - if anything these non-bleeding edge equipment should be easier to source parts for because it's going to be more off the shelf sort of stuff (though no schematics and fine pin pitches, for sure).If you're not comfortable attempting the repair yourself, I'd sell and buy a used generator from a slightly older vintage. You can get a decent 3GHz generator in fine condition for half or a quarter of that repair price, and since the one in question is a newer model, selling it as broken could actually pay for a used working older model unit...Don't know what to tell you. It's definitely a high quote, but it's sort of in the range I'd expect unless you have some warranty or service agreement.

author: Oldtestgear
author_rank: Regular Contributor
timestamp: April 30, 2018, 06:31:20 pm
content: Not intended to be a venting post. I have other sig gens that are better & seemingly more robust, so this one can be sold to help someone else repair theirs. I do want it to either become a parts donor or be repaired. This is because I hate things that are broken. I am not comfortable digging around on SMT boards with no information, especially if there is another option.Thanks for the thoughts.Phil

author: CJay
author_rank: Super Contributor
timestamp: April 30, 2018, 06:47:14 pm
content: I'm guessing this is going to be way outside my price range but how much for the complete unit?

author: nctnico
author_rank: Super Contributor
timestamp: April 30, 2018, 07:46:30 pm
content: IMHO this shouldn't be really difficult to repair. Maybe the components are hard to get though.
Tektronix 1240 Cart (ROM pack) schematics? - Page 1
Forum section: electronics / testgear

author: Floopy
author_rank: Regular Contributor
timestamp: April 29, 2018, 03:05:41 am
content: Hello,I have a Tektronix 1240 and I noticed that you can find the binary files of the cartridges very easily. My only issue is that I need a cartridge. Anyone know where a schematic or a picture of the inside might reside? It would be really neat to disassemble ML.

author: gslick
author_rank: Frequent Contributor
timestamp: April 29, 2018, 03:48:58 am
content: Volume 2 of the service manual has schematics of the 32KB and the 32KB/64KB versions of the 1240 ROM packs. Pages 187 and 189 of the PDF scan of the Volume 2 manual referenced below:http://www.bitsavers.org/test_equipment/tektronix/logicAnal/1240/070-4342-01_1240svcVol1_Jan87.pdfhttp://www.bitsavers.org/test_equipment/tektronix/logicAnal/1240/070-4717-01_1240svcVol2_Oct88.pdf

author: lordvader88
author_rank: Frequent Contributor
timestamp: April 29, 2018, 04:05:29 am
content: Do the big names release schematics/full service manuals of their newer models ? It's great I have up to some 1990s schematics, but I never looked for newer ones.

author: Jim Narem
author_rank: Contributor
timestamp: April 29, 2018, 06:49:36 am
content: The 32K/64k rom packs were generic, the roms were socketed, so you really only need to track down one of the cartridges and just swap the roms.There is a design for a ROM/RAM pack, called SuperPack by Pavel Korensky. It uses a DIP switch to swap between 8 ROMs and 2 RAMs, each 64K.I have put pictures of the tektronix 32K/64K ROM pack, and the design files for SuperPack up on the Tektronix 1240 page at TekWiki.http://w140.com/tekwiki/wiki/1240

author: Floopy
author_rank: Regular Contributor
timestamp: April 29, 2018, 04:58:44 pm
content: Thank you, that helps a lot I appreciate it.
HP/Agilent 8753E/8753ES VNA SWR - Page 1
Forum section: electronics / testgear

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: April 30, 2018, 09:13:34 am
content: I've been playing with my HP 8753E (basically an 8753ES) and trying to do forward S11 SWR tests to look at GHz antennae matching at different frequencies. I eventually figured out how to calibrate using my Kirby SMA kit. The bit I'm struggling with is setting and interpreting the 'Y' scale. I've attached a screen shot below of a wide-band PCB antenna with a 4 GHz span centered on 2.4 GHz. I looked in the menu's but haven't found a way to annotate the Y axis with values. There's 1 marker I added that's giving me (I think) the SWR at the marker of 1.3717? If I put a 50 Ohm load on then the trace is a flat line at the very bottom and if I disconnect (open circuit) then the line is flat at the top of the screen.Any help or links to good documentation are appreciated.

author: gsocker
author_rank: Contributor
timestamp: April 30, 2018, 11:07:44 am
content: It's not possible to annotate the Y axis on the 875x series AFAIK. You have to look at the reference value and know what the Y scale is. In your case, it says "1.119/ REF 850m", so the bottom line is .850. You then have to know what you've set the per-division scale to - in your case, 1.119/div.In your case, you may as well set the reference level to 1, since the SWR can't be lower than that. It's also possible to adjust the position of the reference line; for SWR it makes sense to leave it at the bottom. Also, it will probably be easier to read the chart if you set the per-division scale to something like 1, .5, etc.For other measurements, it may make more sense to have it elsewhere. The position of the reference line is shown by the triangle along the left side of the plot and the line across the screen at the same point.The marker is showing you the VSWR at the frequency shown at the top right. There are also search options for the markers; you can have it search for Min/Max and a few other things. It can also track the max/min instead of just doing a one-time search.
Enabling options on Lecroy Wavepro 940 and LT264 - Page 1
Forum section: electronics / testgear

author: Mr Nutts
author_rank: Regular Contributor
timestamp: May 01, 2018, 07:24:21 am
content: Hi All,Since there already are discussions about hacking for scopes from other manufacturers I figured posting this is ok.I have been given a Lecroy Wavepro 940 oscilloscope, which unfortunately came in the basic configuration with none of the software options enabled. I wonder if somebody has found a way to enable options on those scopes?

author: Mr Nutts
author_rank: Regular Contributor
timestamp: May 02, 2018, 10:23:33 am
content: Got a Waverunner LT264 yesterday, another scope with no options and just a few hundred k of sample memory. Enabling more would be nice
Hantek HDG2000 Raspberry Pi CPU conversion - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: April 28, 2018, 04:41:42 am
content: This is my idea of making the HDG2000 more powerful and flexible.The interconnection between the CPU and FPGA is a HS-SPI bus with three additional signals for FPGA code loading (all signals including the front panel are of the +3.3V level and therefore can be directly connected to the Raspberry Pi).According tohttps://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md, the SPI bus can run at up to 125 MHz but you need to be careful with wiring length and layout; in theory, the FPGA should be able to handle speeds faster than 16.666667 MHz (this was the speed of the original CPU HS-SPI bus).The following bridges need to be removed before the conversion: (SD: RA2, R41, R42, R212; USB: R909, R908, F2; CPU-Main: U14, U13, P11 or components within their IC footprints)A different LCD and controller will be required, and the front panel (isolate from Hantek board first before connecting to the Raspberry Pi) uses the I2C bus (where an RTC can be easily be attached) with an active high IRQ signal, and I will provide the front panel connector pinout and key make/break codes on request.Finally, a serial console port, beeper (and via a USB adaptor, a front panel SD card interface) can also be provisioned.In case you may ask me about coding for this project, my strength here is contributing realistic and viable ideas.
Siglent 3303x review by Marco Reps (and OSMU project anouncment) - Page 1
Forum section: electronics / testgear

author: Cliff Matthews
author_rank: Unknown
timestamp: April 27, 2018, 11:43:16 am
content: Packs a lot in <6 minutes. Starts with his older HP 6428B's features, forays into his new Siglent with rerouted internal cable management and no rust (as per Dave), and finishes-off soliciting ideas for a novel idea:A waveform controlled, programmable 4-quadrant, 3-channel, ah... power supply? But then he calls it an Open-Source Measurement Unitlooks well beyond me.. but I thought I'd share it for those not viewing his channel.https://youtu.be/H-BiphMqp5g

author: BillB
author_rank: Unknown
timestamp: April 27, 2018, 01:50:21 pm
content: I like the way he thinks! I'd buy an OSMU.

author: nidlaX
author_rank: Frequent Contributor
timestamp: April 27, 2018, 10:00:33 pm
content: We need a firmware dump of the 3303X so we can flash the 3303D and S models with the enhanced GUI.

author: baltersice
author_rank: Regular Contributor
timestamp: April 27, 2018, 10:40:31 pm
content: I have a few of those Chinese ST-LINK V2 sticks, can I get the STM32s firmware with that?

author: nidlaX
author_rank: Frequent Contributor
timestamp: April 28, 2018, 04:14:22 am
content: Quote from: baltersice on April 27, 2018, 10:40:31 pmNot sure, and my statement is really just a hunch, but the hardware from the X teardown looks pretty much identical to my D. Unfortunately, they changed the firmware upgrade process and the X series now has some encrypted firmware. The file structure is similar to their X series scope's, so a soft hack should be possible, but not as simple as the D to S change with a one byte edit in a hex editor.
Rigol DS1054Z vs Tektronix 2430A - Page 1
Forum section: electronics / testgear

author: lordvader88
author_rank: Frequent Contributor
timestamp: April 27, 2018, 09:39:59 pm
content: I have a solid Tek2215 60MHz, that's great for me as an analog scope (I have 2 1960s scopes as well)I plan to get at least a new ds1054z as my main compact modern scope. And it has 4 channels. 50MHz w/1 ch I guess or is it 2 ?Tonight I should replace the 2nd CCD hybird (did 1 last summer) in my Tek2430A. I'm not sure if thats classed as 40MHz or 150MhzQuoteI love the tek2430a, my 1st scope. But that could be hard/expensive to keep in parts I guess with those hybirds IC dying off. Data logging from it is harder/more expensiveAs a DSO, what can it do better than the ds1054z ?I could get 1 next month and sell the 2430a

author: Howardlong
author_rank: Super Contributor
timestamp: April 27, 2018, 10:23:24 pm
content: About a decade ago, I had just a 400MHz 2+2ch Tek 2465B CRO, and a 200MHz 4ch Tek TDS2024B DSO.Due to space constraints at the time I had to get rid of one of them, and with much reluctance the 2465B went, but the reality is that in practice, much as I love CROs, a DSO, even a TDS2024B, does a better job over all. Most important of all, a DSO offers persistent single shot, but there are plenty of other benefits too.Perhaps the biggest downside of a DSO like the 1054Z is that it UI might feel quite sluggish and frustrating to navigate at first compared to a CRO, but the feature benefits over a CRO are enormous.Keep in mind that all channels operate at 50MHz bandwidth, but the sample rate reduces the more channels you have running. At 50MHz this is not such a big deal, but at 100MHz it becomes noticeable if you have three or four channels running (250MSa/s each channel).Also note that it’s a piece of cake to increase the bandwidth to 100MHz and liberate other features if they’re not already liberated.

author: tautech
author_rank: Super Contributor
timestamp: April 27, 2018, 10:56:37 pm
content: Howard offers a good short summary but I should add for those venturing into the modern compact DSO world there's some specs one should research and consider.# of ADC's, their max sampling rate and how this might be shared with 1, 2 or all channels active.Same for memory depth.Waveform update rate.Maximum vertical sensitivity, real orcontrivedand is it at full BW or BW limited only.Modern compact DSO's have limited front panel real estate in which to offer all their capabilities.....do you like the UI, are the 'features' you'd commonly use grouped efficiently and within 'easy' access with minimal keystrokes/button presses to gain access to them. How easy is it to record screenshots......do they showallthe info (settings) you'd want captured .....the list is massive and one brands UI might be better than another.....foryou.
ATTEN ADS 1062 DSO from China - Page 1
Forum section: electronics / testgear

author: lordvader88
author_rank: Frequent Contributor
timestamp: April 28, 2018, 01:58:50 am
content: Just wondering what these are. Here's a 1042I take it they are a poorer person's ds1054 like the ? icr ? , another ebay China model. Not knocking China btw, they can make stuff as good/bad as they decide to, for the price.

author: tautech
author_rank: Super Contributor
timestamp: April 28, 2018, 02:20:44 am
content: Quote from: lordvader88 on April 28, 2018, 01:58:50 amSiglent SDS1kC*L series.1054Z or any of the newer Siglent SDS1kX or X-E will run rings around them.
Analogic (Data Precision) 8200 voltage calibrator - Page 1
Forum section: electronics / testgear

author: vtp
author_rank: Regular Contributor
timestamp: June 26, 2014, 12:54:37 pm
content: Hello,Would anyone have service manual/schematics for options 488 and 1KV for the 8200 voltage source?Or even a good hires picture of the 1kV option installed?Thanks,

author: 0xPIT
author_rank: Regular Contributor
timestamp: August 10, 2014, 07:38:51 pm
content: I'd also appreciate more info and schematics on the 1000V option!

author: JimBeam
author_rank: Contributor
timestamp: April 26, 2018, 06:47:43 pm
content: And another 4 years later...I'm also interested in the 1kV option - is there really nobody who does have it?Andreas

author: vtp
author_rank: Regular Contributor
timestamp: April 26, 2018, 07:06:56 pm
content: Quote from: JimBeam on April 26, 2018, 06:47:43 pmI do, now.I got it a while ago (could be a year or more). I think I took some pictures of the high voltage assembly but IIRC I did not disassemble it fully. It was a little bit more complex and shielded than I thought originally.
Help VintageTEK preserve/convert their microfiche manual and document records - Page 1
Forum section: electronics / testgear

author: w2aew
author_rank: Super Contributor
timestamp: April 04, 2018, 05:46:09 pm
content: Can you help vintageTek convert their microfiche archive to searchable PDFs? This will help create a comprehensive archive of old Tektronix manuals and documents. Please contribute if you can, they're more than halfway to their funding goal!https://www.youcaring.com/vintagetekmuseum-1085244

author: BravoV
author_rank: Super Contributor
timestamp: April 26, 2018, 04:01:41 am
content: Bump !Just in case for those who are not aware of this and believe this deserved an attention as its almost there.

author: mtdoc
author_rank: Super Contributor
timestamp: April 26, 2018, 04:24:29 am
content: Donated. Good cause.
Siglent SDS1104X-E - adjustment of relative phase of channels - Page 1
Forum section: electronics / testgear

author: bmdaly
author_rank: Contributor
timestamp: April 25, 2018, 09:57:39 pm
content: Hi,Is there a way to adjust the relative phase of channels on the Siglent SDS1104X-E oscilloscope?For example, where I have 2 signals on separate channels of the same frequency (or an integer multiple of), but out of phase, I would like to be able to adjust the relative phase displayed so that they overlap in time.I realise that I could use vertical and horizontal cursors to measure differences in phase and amplitude, but having the signals overlap allows for easier and quicker comparisons.The "deskew" adjustment seems to offer this, but this is limited to +-100ns, so is of limited use for low frequency signals.Thanks,Brian

author: tautech
author_rank: Super Contributor
timestamp: April 26, 2018, 12:33:07 am
content: Quote from: bmdaly on April 25, 2018, 09:57:39 pmIf your 'first' signal is your unchanging reference you can save it as a reference waveform and then by way of trigger settings and the horizontal offset allow you to overlay the 'live' waveform over it.There's also the Invert channel and if the waveform is more than 180odelayed this might work to get the Deskew adjustment range to work for you.QuoteIt's intended usage is to null propagation delays from different probes and/or cables and therefore the adjustment range is appropriate for just that use.
Using a Hacker RF one as an oscilloscope - Page 1
Forum section: electronics / testgear

author: daslolo
author_rank: Regular Contributor
timestamp: April 24, 2018, 09:58:59 pm
content: I don't know if it makes much sense but I saw clean signal from 1 to 6000 Mhz and wondered if anyone was using this cheap gear as oscilloscope and spectrum analyzer.

author: ataradov
author_rank: Super Contributor
timestamp: April 25, 2018, 03:44:51 pm
content: It has 20 MSPS ADC, so the actual bandwidth of the signal will be pretty low. You can do a spectrum analyzer, but it is impossible to make an oscilloscope out if it.And that is not to mention that a scope that can't see blow 1 MHz is sort of useless.

author: daslolo
author_rank: Regular Contributor
timestamp: April 25, 2018, 09:24:01 pm
content: That's right, now I see why it's no good for oscillo. Weird that Ossmann said in 2014 that it's doable...

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 26, 2018, 12:11:56 am
content: even if you can tolerate > 1MHz signal, i suspect there is no phase information for the displayed FFT from HackRF, (RSSI or magnitude info only), meaning if you want to generate time domain signal through inverse FFT, then you have to guess the spectrals' phases, so the t-domain shape can be anything.
Stable32 - for Time Nuts and GPSDO owners - now free - Page 1
Forum section: electronics / testgear

author: jpb
author_rank: Super Contributor
timestamp: April 29, 2018, 11:54:47 am
content: I meant to post this several months ago and then forgot about it so it may have already been posted by someone else. A quick search didn't reveal another posting though.The Stable 32 software from William J. Riley has become a free download, as from last December.If you're into trying to measure your GPSDO or other clocks it is very useful and Bill Riley's web site is well worth visiting for lots of papers/project descriptions on it as well as the link for the software:http://www.wriley.com/The manual is part of the software as a pdf but it is only $20 to buy it as a paper copy from LuLu (I've just ordered it). I've also bought his book on frequency measurement (also a pdf but I prefer paper copies).
$5 USB 3 channel AWG - Page 1
Forum section: electronics / testgear

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 25, 2018, 04:04:23 am
content: Not sure if this is the right place, but there does seem to be a lot of potential!https://osmocom.org/projects/osmo-fl2k/wikiSummary: It is a cheap USB 3.0 to VGA converter that can be programmed to output continuous waveforms without sync gaps.

author: llkiwi2006
author_rank: Regular Contributor
timestamp: April 25, 2018, 04:43:18 am
content: ~150MSPS seems to be achievable. So with an appropriate anti-aliasing filter and output amplifier attached, it could be a pretty decent entry level AWG. Downside is only 8bits of resolution though.
HP5335A why is the led cover removable? - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: April 24, 2018, 01:25:03 am
content: I've never seen anything like this before....I was looking at new-to-me HP 5335A universal counter. In 3 places on top edge of smoked acrylic, there are small black levers and by sliding it, the acrylic piece comes off. Why is this? I looked for a hidden switch or something but I couldn't find any. While this is a good idea, this is the only piece of gear such thing exists. Anyone have any idea/information on this?

author: Dr. Frank
author_rank: Super Contributor
timestamp: April 24, 2018, 08:34:19 am
content: Many of the instruments of that era had this removable filter plate, like the 5370A/B, and older ones, but also DMMs, if I remember correctly.Maybe it is from the time when the display was made of Nixie Tubes and light bulbs for the units tell-tale, so that these could easily be changed when failing.The filter plate of my 5370B was broken, maybe that was happening so often, due to the size, that they made it easily removable.If you read the 5370 manual, obviously the LED seven segment displays, and the indicator LEDs were failing sometimes, and they were assembled in sockets.

author: tkamiya
author_rank: Super Contributor
timestamp: April 24, 2018, 05:40:57 pm
content: What a thoughtful design!
CMU200 CF card problems - Page 1
Forum section: electronics / testgear

author: aiju
author_rank: Newbie
timestamp: January 07, 2018, 12:17:37 pm
content: I just bought a CMU-200 with FMR5 board and I'm trying to get it to read from CF cards with a CF-PCMCIA adapter. There are some bizarre corruption issues, files without too many null bytes in a row seem to read fine (I've tried a few hundred KB), but files that do have lots of null bytes in them end up with null bytes moved around in a random fashion. I've seen this problem with two CF adapters (Transcend and Spartechnik) and two CF cards (Platinum(?) and Transcend). Has anyone had any luck with CF-PCMCIA adapters?

author: CJay
author_rank: Super Contributor
timestamp: January 08, 2018, 12:56:13 pm
content: Yes, mine works fine but with 256MB cards, I suspect it may have problems with larger cards?

author: texaspyro
author_rank: Super Contributor
timestamp: January 08, 2018, 08:31:27 pm
content: A lot of older equipment can flake out with disks/cards over 2 GB due to the limits of the FAT16 file system.

author: aiju
author_rank: Newbie
timestamp: January 09, 2018, 07:52:16 pm
content: Yes, FAT16 is the obvious issue. I've been using a DOS virtual machine to make a 2GB FAT16 partition on these cards.It seems to work fine with a much more expensive delkin devices 4GB card. I guess the cheap ones don't like the long wires in the adapter or something along these lines.

author: ZL1CVD
author_rank: Regular Contributor
timestamp: April 24, 2018, 12:00:45 pm
content: Must use 2GB or lower card with CMU or CRTU. Format is FAT16 only...FWIW - For units with USB, I picked up a cheap USB DVD-ROM from eBay. It works fine and have used it to install Win98 and other stuff onto a CRTU.ATAPI IDE Flash drives also work and speed booting up a bit.

author: CJay
author_rank: Super Contributor
timestamp: April 24, 2018, 12:16:41 pm
content: Quote from: ZL1CVD on April 24, 2018, 12:00:45 pmNot true, the 8GB Lexar in my CMU200 is working perfectly well thank you.
DSA815 VER 00.01.18 - Page 1
Forum section: electronics / testgear

author: willco788
author_rank: Newbie
timestamp: April 23, 2018, 12:29:37 am
content: I just loaded the latest 815 firmware and now I can’t get to the service menus. Trace>TG>Marker Fctn>Meas Setup>System>Print Setup>Storage, no longer works.

author: willco788
author_rank: Newbie
timestamp: April 23, 2018, 01:38:37 pm
content: Thank you, that worked.
Extech EX430 missing part - Page 1
Forum section: electronics / testgear

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 19, 2018, 04:36:58 pm
content: Bought "dead" off eBay. Missing a switch contact. Anyone? Willing to pay.Circled in red, I need a larger one like the one circled, it's missing on the right side. Thanks!

author: 001
author_rank: Super Contributor
timestamp: April 20, 2018, 12:01:37 pm
content: Is it missing? It may be normal for few models

author: ElektroQuark
author_rank: Unknown
timestamp: April 21, 2018, 01:02:38 pm
content: There are some marks in the "socket" that looks like there was one.

author: giosif
author_rank: Frequent Contributor
timestamp: April 21, 2018, 01:57:10 pm
content: You sure there is supposed to be one on the right-hand side?Here's a teardown done by someone on the forum and there is only one such large contact (same as what you have).https://www.eevblog.com/forum/testgear/extech-ex430-multimeter-teardown-photos/UPDATE:Looking at the picture from the above teardown, I think the larger contact should go on the other side of the selector in your meter (i.e. move the larger contact from the left side to the right).

author: joeqsmith
author_rank: Super Contributor
timestamp: April 21, 2018, 02:54:30 pm
content: Many of the meters seem to use the same contacts. You may consider just cutting one contact off a double and soldering it to a standard one as a work around.

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 21, 2018, 09:01:06 pm
content: Hmmm. It's completely dead, yet if I short both of the positions on the main board where the larger contacts appear should be when in one of the first switch positions, using a bit of aluminum foil, the meter chirps, comes alive and the display appears. I have tried the one larger contact in both possible locations, no change.I'll check it some more and post back.

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 21, 2018, 09:18:53 pm
content: Quote from: giosif on April 21, 2018, 01:57:10 pm

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 21, 2018, 09:23:07 pm
content: The responses so far have been quite encouraging, and glad to know I don't need the "missing" contact.Probably should be able to get it going. I'll keep you guys updated.

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 22, 2018, 10:50:38 am
content: I moved the large contact back to the top position and it now functions ONLY on DC volts and Ohms.Shows DC milli-volts on the display in all other positions. The contact is split (broken on one edge, so there may still not be adequate tension on all three contact points.At this point I think I still need a new contact to try.I'll keep my eyes open for one somewhere.
Tektronix .tiq format question - Page 1
Forum section: electronics / testgear

author: Sparker
author_rank: Regular Contributor
timestamp: April 22, 2018, 01:49:49 pm
content: I wasn't able to find any reference on the Tektronix .tiq format structure, so I though I'd ask here.So, we had to record continuous baseband IQ samples with a Tektronix RSA306B RSA. But I have a suspicion that the recorded data is not continuous but rather in blocks of N samples separated by many, many milliseconds between each other.Unfortunately I don't have the SignalVu software with me right now to check it.I think so because if I open any of the .tiq files i see this:QuoteThen there is a number of <DataSet> blocks. Every <DataSet> has a <TimestampOffset> field, which appears to me as the start time when this block was started being recorded. Every next DataSet's TimestampOffset is increased by about 10 milliseconds, that's what confuses me a lot:QuoteSo, could someone clarify this for me, please?
Cable Pair Identifier - Page 1
Forum section: electronics / testgear

author: PowerNet
author_rank: Regular Contributor
timestamp: April 21, 2018, 09:07:30 am
content: Hi all,Just wanted to know what are some professional Cable Pair Identifier similar to the Aegis CZ1000.Any Fluke branded ones you guys could recommend ? or is Aegis one any goods ?thanks

author: LaurentR
author_rank: Frequent Contributor
timestamp: April 21, 2018, 02:38:04 pm
content: Not familiar with the Aegis unit you're mentioning, but I assume it's a "toner", in which case, the common one in the US is the Fluke Networks Intellitone series:http://www.flukenetworks.com/datacom-cabling/copper-testing/IntelliTone-Pro-Toner-and-ProbeThey also have an older "analog" one:http://www.flukenetworks.com/datacom-cabling/installation-tools/Pro3000-Analog-Tone-and-Probe

author: james_s
author_rank: Super Contributor
timestamp: April 21, 2018, 05:36:56 pm
content: I have a Harris branded set that looks absolutely identical to that Pro3000 except it's red instead of black. I just used it yesterday, it works really well.

author: Gregg
author_rank: Super Contributor
timestamp: April 21, 2018, 05:58:06 pm
content: I highly recommend this onehttp://www.flukenetworks.com/datacom-cabling/copper-testing/MicroScanner-Cable-VerifierI have the kit, the 6 little dongle identifiers can save a lot of time sorting individual cables, plus the screen shows if there is any open, shorted or crossed wires.
Need help with Feeltech signal generator  FY2300h software - Page 1
Forum section: electronics / testgear

author: exocet
author_rank: Newbie
timestamp: March 28, 2018, 08:53:21 pm
content: This is my first post here. I recently bought an FY2300h 50Mhz signal generator from banggood.It came with a CD with software and manuals for various Feeltech models but for FY2300H there is only a 'exe' file which in my case seems to be corrupted.(when I run it I'm getting an error message ''unable to open archive'')Also there is no driver or txt file showing the necessary steps for installation.Software is very importand to me since I want it to make my own waveforms.I would be gratefull if someone can point to a download link for my model (FY2350H V3.1).

author: exocet
author_rank: Newbie
timestamp: March 29, 2018, 05:29:46 pm
content: Am I the only who owns this signal generator?

author: rajivdeo
author_rank: Newbie
timestamp: April 21, 2018, 05:39:51 am
content: I own FY2300H.You may download the manual and software v4.6 fromhttp://en.feeltech.net/html/download/show_50.html
New to me HP8553A - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: April 19, 2018, 05:54:51 pm
content: New to me HP5335A just arrived.... yayFirst off, I can't seem to find a manual for this anywhere. If someone can point to me to a source, I'd be appreciative.I ran though some basic test. Few issues....Channel A seems to workChannel B seems to work to display ratio against A but there isn't a way to display frequency of BThere is a VOLT button that displays "0" (I read somewhere, this is an option?)Can anyone assist, please?

author: Tomorokoshi
author_rank: Super Contributor
timestamp: April 19, 2018, 10:10:50 pm
content: I take it you mean the 5335A Universal Counter?Keysight has a good scan:https://www.keysight.com/en/pd-1000001399%3Aepsg%3Apro-pn-5335A/universal-counter-200-mhzArtek also has a copy that may be clearer:http://artekmanuals.com/manuals/hp-manuals/

author: tkamiya
author_rank: Super Contributor
timestamp: April 19, 2018, 11:07:59 pm
content: For some reasons, I am not able to download from Keysight. Downlaod gets stuck and ends with no document found.Second one is paywalled.... I kind of want to try free ones first.Thank you though.AND! What is this 5.1Mhz reference clock thing?? Five POINT ONE?

author: Tomorokoshi
author_rank: Super Contributor
timestamp: April 19, 2018, 11:43:28 pm
content: Which browser are you using? Do you have a blocker running? The Keysight web site has a pop-up that asks for registering. You don't need to, you just need to cancel it out. I need to use Chrome to get through. Otherwise FireFox blocks it.The other one has clean scans of the manuals. Many of the Keysight ones are 3rd generation scanned photocopies of faxes.

author: DimitriP
author_rank: Super Contributor
timestamp: April 20, 2018, 11:33:49 am
content: QuoteTo display frequency of B , you have to select the B input; press: Scale, Smooth, 17, ENTER

author: DimitriP
author_rank: Super Contributor
timestamp: April 20, 2018, 11:47:01 am
content: Quotewww.k04bb.com, go to manuals and search for 5335A or click belowhttp://www.ko4bb.com/manuals/76.90.128.59/HP_5335A_1_Operating_and_Service_Manual_(05335-90021).pdfEnjoy your 5335a

author: tkamiya
author_rank: Super Contributor
timestamp: April 21, 2018, 02:46:35 am
content: Thanks everyone. I got a pdf copy of manual from a third party. It basically explained all of my concerns.
extra / spare testleads of the BM235 - Page 1
Forum section: electronics / testgear

author: Remcohn
author_rank: Newbie
timestamp: April 20, 2018, 01:36:44 pm
content: I bought a EEVblog BM235 recently and love the testleads, and would love to refresh another meter with the same leads.Does anyone know which leads are used and where i can get them? (or silimar ones)Thanks!

author: Maxlor
author_rank: Frequent Contributor
timestamp: April 20, 2018, 01:40:42 pm
content: Yup, I bought several spare sets as well. Here is a good place to get them:https://www.ebay.com/itm/Brymen-Silicone-Gold-Plated-Test-Leads-Probes-for-Multimeters-CAT-IV-1000V-/171162377470

author: Remcohn
author_rank: Newbie
timestamp: April 20, 2018, 01:46:08 pm
content: awesome! thanks