hybridfree/eevblog-posts huggingface dataset:
Philips PM3585 add GPIB option - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: August 02, 2014, 10:58:13 pm
content: Evnin'...I have a Philips PM3585 logic analyzer here without GPIB....but the GPIB connector is fitted on the back...Is there an easy way to add GPIB functionality to this device?I opened up once the device but failed getting to the main PCB board as the service manual wasn't quite clear how to remove the main board...

author: IanJ
author_rank: Unknown
timestamp: August 02, 2014, 11:21:27 pm
content: You might be able to pick up tips on how to access the main board etc on my video here:http://www.ianjohnston.com/index.php?option=com_content&view=article&id=99Ian.

author: davorin
author_rank: Unknown
timestamp: September 24, 2014, 06:26:29 pm
content: Got now the GPIB ICs installed....you really have to remove the few screws at the back....as well all black screws around the main board holding it to a metal frame....and of course the bigger 6 screws spread in the middle of the main board...Does the PM3585 needs any special software to activate GPIB?I don't seem to find any configuration option to set the address...nor does it show anywhere that it recognized it....ALso didn't see any RS232 options...

author: davorin
author_rank: Unknown
timestamp: September 25, 2014, 03:10:39 pm
content: Really nobody has a PM 3585 with the GPIB option installed?Haven't found any information on the web regarding GPIB and RS232 communication with this device....Service manual states only that a SN75160, SN75161 and a TMS9914 can be installed to have GPIB feature...
Flir E4 Closeup lens adapter from PCB stock - Page 1
Forum section: electronics / testgear

author: eb4eqa
author_rank: Regular Contributor
timestamp: September 21, 2014, 06:08:55 pm
content: Hi,I've been using this adapter I made for some time and it was about time to share it with you guys.I stole the idea from one of Mike's videos where he suggested PCB could be used but I never actually saw one like this. It is made from 1.6mm PCB stock and the 20mm ZnSE lens is simply press-fitted. To place the adapter in the camera you simply insert one side against the wall, compress the other side with a nail or a tool and release it after the PCB is laying flat on the bottom of the camera. It does not scratch the camera and it won't fall easily at all. You need to put the camera quite close to the subject to get it in focus, just fine.I'm attaching the .DXF file so you can generate the G-Code of your choice.Best regards,Roberto EB4EQA
GW GAG808 teardown - Page 1
Forum section: electronics / testgear

author: SeanB
author_rank: Super Contributor
timestamp: September 20, 2014, 12:20:52 pm
content: Was at the scrapyard, and rescued these 2 GW audio oscillators from the pile. There were other items there, including a nice XY plotter, but it had suffered from "The Claw"Inside you have a nice function generator, will try later to replace the power cord and see if it works. Should work, seeing no major issues. Interesting frequency adjustment method, using a variable capacitor and the gearbox driving it. Made 30 December 1991, they must have been working overtime at the factory.
FADOS9F1 - Page 1
Forum section: electronics / testgear

author: karderis
author_rank: Newbie
timestamp: July 05, 2013, 12:31:32 pm
content: Hello guysBy searching on the web I discovered this unit " FADOS9F1" which is a type of V-I tester and oscilloscope and other things. The company that producing it is situated in Turkey. This is the websitehttp://www.ht-eurep.de/en/Produkte/FADOS9F1/fados9f1.htmlPlease take a minute and have a look. I wish that David will also be attracted. I definetely need your opinion

author: tbayraktar
author_rank: Newbie
timestamp: September 20, 2014, 10:57:52 am
content: It's made in Bursa, Turkey. I need a VI tester like this. I watched the videos, but I should try it before buying. A review would be well enough to have an opinion about the tester.
Keithley 7001 switch and the ebay test equipment addiction.... - Page 1
Forum section: electronics / testgear

author: Smokey
author_rank: Super Contributor
timestamp: September 20, 2014, 05:11:34 am
content: Well I fell off the wagon again and bought more test equipment on ebay that I have no immediate use forThis time it was a great deal on a Keithley 7001 switch. It's in great condition, but doesn't have any cards.http://www.keithley.com/products/switch/multi/?mn=7001I think this is my first ebay equipment purchase that is still in current production. Most of the other stuff is older than I am.
uCurrent latest revision - Page 1
Forum section: electronics / testgear

author: rlogiacco
author_rank: Contributor
timestamp: September 19, 2014, 01:47:06 pm
content: I see the uCurrent is back in stock in the shop and I see various pictures around with different connectors and so forth: I'm curious to know how the latest machine assembled uCurrent looks like :-DMay be Dave is willing to post some picture....

author: Neganur
author_rank: Unknown
timestamp: September 19, 2014, 06:40:22 pm
content: Not sure if the page has changed but I see only one picture athttp://eevblog.myshopify.com/products/ucurrentPretty sure that's the latest version (according to the video blog, can't remember the number)
Closeup lenses for Flir Ex - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: September 19, 2014, 11:37:14 pm
content: I have read several posts about "how to build closeup accesories for Flir Ex", but, I wonder whether there is any seller who sells the lens holder ready made (or both, the lens and the holder together) ?.
Need recovery CD for WinME version of TDS 5054 scope - Page 1
Forum section: electronics / testgear

author: darron
author_rank: Unknown
timestamp: September 19, 2014, 03:35:58 pm
content: Help!I just got a nice TDS 5054 scope, but the hard drive is bad.I've got a WinME key on the back of the scope, but I need the recovery CD for the scope to recover it. The scope didn't come with this. (or anything, really)Does anyone have this recovery CD they could send me a copy of? I have the license key, so it should be okay to do this.Tek says they have the Win2K recovery media but no WinME recovery media. Since I don't have a Win2K key I don't think I can use that. Plus, Tek wants $416 for it.
HP LogicDart old article - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: September 18, 2014, 10:37:40 pm
content: Hi.I am looking for an old article (1997-2000) which was writen about the HP LogicDart.The article was trying to explain why the HP LogicDart "failed" to sell and why it was a "badly designed" product. :-(I remember it was a PDF submited to some event (not a technical event; it was about design and marketing), but I cannot remember anything else.I would appreciate anyone to point me out to that article.
New Vintage HP Junk for Me! - Page 1
Forum section: electronics / testgear

author: Mr. Coffee
author_rank: Regular Contributor
timestamp: May 03, 2014, 01:22:04 am
content: I'm addicted to old HP AC millivolt meters. My newest resto job was this 400C model. Stated bandwidth is 20 Hz to 2 MHz, 1 mV to 300 V full scale--but anyone will tell you that's conservative. This particular unit reads flat dead nuts accurate to about 3 MHz.Great for setting audio amplifier gain or MW RF work. You can hook the test leads to an antenna and the output of the amplifier (the upper right pair of binding posts) to a diode and headphones and listen to radio broadcast.There are ten tubes inside.cheersRob

author: robrenz
author_rank: Super Contributor
timestamp: May 03, 2014, 01:56:20 am
content: Nice restore jobI have the same disease

author: Mr. Coffee
author_rank: Regular Contributor
timestamp: May 03, 2014, 03:37:43 am
content: Thanks, they are pretty amazing instruments even today. Handy on the workbench. When I'm feeding a sinewave from a signal generator to test gain or frequency response they are a lot easier to use than a scope, in my opinion. Sometimes, all I need is (sine) RMS voltage and that needle swing is pretty easy to interpret.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: September 18, 2014, 07:55:57 pm
content: A pic of my HP milli Ammeter. Zero tubes inside! No model # on it either, but it looks a a lot like that 400C. Me thinks it might be internal company test equipment used in Palo Alto. Anyone see one of these before? clue to vintage?

author: Bored@Work
author_rank: Super Contributor
timestamp: September 18, 2014, 08:19:39 pm
content: Quote from: SoundTech-LG on September 18, 2014, 07:55:57 pmLooks more like someone fitted an HP meter movement in some other enclosure. Maybe a repair job, a frankenstein.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: September 18, 2014, 08:42:05 pm
content: Well dude, it's not my job to prove anything to you, but I can easily open it up again to show you (photos) of the innards, ALL HP inside, and does not look hacked. The main thing to consider here is the meter face. Just browse all the old HP catalogs. You will NOT find that meter face anywhere, on any HP models. Most likely internal Factory use only test equipment. That's not so hard to believe now, is it???

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: September 18, 2014, 08:55:19 pm
content: Sent photos to Ken Kuhn.Ken's opinion... Internal use Test Equipment.http://www.kennethkuhn.com/hpmuseum/
Rigol DS1074Z - can it be placed against a wall? - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: September 18, 2014, 10:15:30 am
content: I was just looking at pictures of the Rigol DS1074Z and wondering....Can this thing be placed right up against a wall or does the power cable prevent it? Looks to me like they put the power socket right at the back of the device, not recessed or on the side (unlike all the other connectors).Surely not. What kind of numbskull would do that?PS: In the pictures of "box contents" I've seen it looks like they don't even give you a right-angle power cable.

author: gmit77
author_rank: Regular Contributor
timestamp: September 18, 2014, 11:57:59 am
content: ciao! yes the cable will not let you place the unit straight agaisnt the wallfrom the ventilation point of view no problem since it is on the side.if you like some more product images just ask and I will made them for youciao

author: Fred27
author_rank: Unknown
timestamp: September 18, 2014, 02:34:32 pm
content: I noticed this flaw when I went to sort out a shelf for it above my workbench. A right angle cable would definitely help.

author: Fungus
author_rank: Super Contributor
timestamp: September 18, 2014, 07:08:46 pm
content: Gah! Some people really need a good slapping.The reason I'm asking this is because I've got a 12cm wide shelf along the back of my workbench where I put my small stuff. The Rigol would sit brilliantly on it if it didn't have a stupid plug design.Let's see: The Rigol specs say it's 16cm high and 12.2cm deep. Looking atthis imageand doing the math it looks like the 12.2cm depth includes the knobs. If so, the front foot is about 10cm from the back of the unit. The plug socket also looks like it has about 1cm of clearance.That means I'll have 3cm of space to play with. Should be possible with a right angle plug...
HP 3585 A vs B - Page 1
Forum section: electronics / testgear

author: katzohki
author_rank: Frequent Contributor
timestamp: September 18, 2014, 01:45:32 pm
content: I'm going to pick up a 3585A spectrum analyzer tomorrow, was just wondering what is the difference between the A and B models?

author: MarkPalmer
author_rank: Regular Contributor
timestamp: September 18, 2014, 02:05:39 pm
content: I just went through this myself, and purchased 3585A myself because of the lower cost. There isn't much at all different in their features or operation other than a few upgraded specs on the B model. The biggest difference is processing speed. Like the 856X analyzers this model got a processor enhancement with the B suffix (HP custom processor to Motorola if the same as the 856X analyzers) that speeds it up. The B sells for a lot more, so its a tough decision if its worth it or not. The A is sort of slow processing low frequencies at low RBW's, but it will do the job.Forgot to mention to eat your Wheaties before picking it up. These analyzers are HEAVY.-Mark-

author: katzohki
author_rank: Frequent Contributor
timestamp: September 18, 2014, 02:46:28 pm
content: Ah that makes sense. If it mostly affects speed on the lower frequencies I can live with that.Haha, it's listed weight is 88 pounds!
Handheld DMM with Analog Bar Graph that Can Function as Null Meter? - Page 1
Forum section: electronics / testgear

author: gridleak
author_rank: Contributor
timestamp: September 17, 2014, 04:17:07 am
content: I'm building a front end proposed some years ago by Conrad Hoffman in Poptronics, to turn an ordinary hand held DMM into a precision null meter. Any hand held with a 200mv or better range is a candidate. However, I anticipate that watching bobbling digits would not be as pleasant as having some analog representation of a null meter. I know that there are hand held DMMs with Analog Bar Graph. I don't own one, and therefore can't exercise the capabilities of such an instrument. Can a member of this forum point me to a particular hand held DMM whose analog bar graph can be programmed to act in "null meter mode"?

author: David Hess
author_rank: Super Contributor
timestamp: September 17, 2014, 08:14:48 am
content: The digital multimeters which I have that include a bar graph do *not* reset the bar graph when relative mode is used. The bar graphs always read absolute values however they *also* read increasing positive or negative voltages to the right so they do serve as sort of an absolute value null meter.

author: bobcat
author_rank: Regular Contributor
timestamp: September 17, 2014, 11:53:46 am
content: Some meters display a Pos/Neg bar graph when in relative mode. The Fluke 87v for example using the zoom power up option.

author: Wytnucls
author_rank: Super Contributor
timestamp: September 17, 2014, 12:37:32 pm
content: The UNI-T UT71 can also do it:The main display shows the null deflection, along with the bargraphThe top left display shows the absolute valueThe top right display shows the offset value

author: gridleak
author_rank: Contributor
timestamp: September 17, 2014, 10:08:54 pm
content: Oh my, no free lunch for me. The fluke 87v goes for around the same price as vintage keithley 155 null meters being flipped on ebay. The ut71 goes for the same price as pre-flipped 155s were going for in august. I'll watch for an unflipped 155 for a couple of months, and if none, learn to live with the bobble.
Testing a 12GHz to 18GHz Microwave Signal Generator - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: September 16, 2014, 11:02:24 am
content: Is there anyway to effectively test the output of a 12-18GHz MW signal generator without having test gear that is capable of measuring the AM/FM modulation of this frequency?Any help would be great.

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 16, 2014, 12:05:19 pm
content: What do you want to test? Frequency, power, modulation, all of the above?

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: September 16, 2014, 12:15:35 pm
content: All if possible, but mostly frequency and power.

author: khach
author_rank: Contributor
timestamp: September 16, 2014, 12:57:23 pm
content: Very simple solution is harmonic mixer and conventional RF generator as heterodyne for harmonic mixer. Output from harmonic mixer connect to conventional spectrum analyzer or DSO with FFT or PC audio card with software FFT.

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: September 16, 2014, 08:57:48 pm
content: Quote from: khach on September 16, 2014, 12:57:23 pmThanks for the reply, this helps!

author: vk6zgo
author_rank: Super Contributor
timestamp: September 16, 2014, 10:56:18 pm
content: Quote from: PA0PBZ on September 16, 2014, 12:05:19 pmLecher Lines?
Parts interchangability between Tek 2236 and 2445A scopes - Page 1
Forum section: electronics / testgear

author: BillWojo
author_rank: Regular Contributor
timestamp: September 19, 2014, 02:04:41 am
content: I had this on the 2235A post but figured I'd get more interest if I started a new post.Do any parts interchange between the Tek 2445A and the 2236 scopes? I picked up a 2445A for 25.00 because it fails on start up with Test 4 Fail 10, looks like it means EAROM Interface fault, check U2118, U2208, U2108 and Q2025. I can clear the message and get nice traces on all 4 channels using the calibration test point. I don't even know where to start with that info. Sounds like I'm in for swapping IC chips.Today I was at the local scrap yard and saw a Tek 2236 laying in the pile. Front was covered with mud and the back looks like it took a hit, round metal cover missing and big dent on the top of the back. I could probably get it for a buck or two a pound.Worth picking up?ThanksBillWojo

author: markce
author_rank: Regular Contributor
timestamp: September 19, 2014, 08:00:48 pm
content: I had a quick look at the 2445A schematic. Does not look like the 2236 at all. The power supply section is very different, as is the display tube. Different logic series and analog ic's used. Overall a very different design.

author: BillWojo
author_rank: Regular Contributor
timestamp: September 19, 2014, 09:33:51 pm
content: Ok, sounds like it won't do me any good than. I need to get by there again and look around some more. Problem with a place like that is test equiptment is treated just like an old computer sent in for scrap. You have to find it before it gets destroyed. They have a whole section of scrap electronics that gets taken apart with absolutely no reguard to ever using it again. Large industrial contactors, transformers of all sizes, all piled into 55 gallon drums. Makes you sick.BillWojo
First Scope - Page 1
Forum section: electronics / testgear

author: JohnSL
author_rank: Regular Contributor
timestamp: September 15, 2014, 03:04:27 am
content: I'm just getting ready to buy my first scope, and I wanted to see what people thought before I actually place the order. Right now I'm thinking of buying a Rigol DS1074Z. From what I've ready, this sounds like a good balance between low price and features. The only need I've had so far is with relatively low-frequency signals. I'm not sure what I'll be needing it for in the future, but I expect it will be signals generally below 1 MHz.So, is this a good starter scope? Or is there another scope you would recommend? I had originally thought of buying a Rigol DS1102E, but I liked the larger screen and features of the DS1074Z.Thanks,-- John

author: marmad
author_rank: Super Contributor
timestamp: September 15, 2014, 03:19:02 am
content: Quote from: JohnSL on September 15, 2014, 03:04:27 amDefinitely a good starter scope, John - and one that is future-proofed for awhile. You don't want to buy the older DS1000E series - it's not just the display size that's smaller, but they're also lacking intensity grading, high waveform update rates at fast time bases, bus decoding options, and larger memory (for better sample rates at slow time bases).Mark

author: Fsck
author_rank: Super Contributor
timestamp: September 15, 2014, 03:21:25 am
content: it's basically unrivaled in its price range (for a new scope). definitely a good buy.

author: nanofrog
author_rank: Super Contributor
timestamp: September 15, 2014, 03:29:07 am
content: Unrivaled value right now for a scope, and would make an excellent starter unit that you won't out-grow very quickly IMHO.

author: JohnSL
author_rank: Regular Contributor
timestamp: September 15, 2014, 04:31:41 am
content: Thanks! I just placed the original.
Agilent U1252B Damage from Recharge with Rotary Switch Movement - Page 1
Forum section: electronics / testgear

author: Wing47
author_rank: Newbie
timestamp: September 14, 2014, 04:44:12 pm
content: Just pulled my DOM 2011.05 Agilent U1252B off the shelf after about 1.5 years unused and found the Original Battery discharged. No Surprise there. Removed the leads. Grabbed the recharge kit and plugged it in to the main and then into the meter. The looked at the rotary switch and realized I had moved it to ohms position while messing with the leads. Quickly moved it back to the Off/CHG position. Test cycle posted and then reported battery error. Did test twice more and figured after several years it was best to just chuck it and get a replacement.While I was reading the manual to get battery specs I noticed a HUGE WARNING to have switch on CHG before connecting charger and NOT MOVE IT while charger is connected.As an amateur I figured I would ask you all:What if any damage may have been done by this?I could just proceed as if nothing happened and wait for a failure to appear, but I'd rather intercept the damage, make repairs and maybe save some part of this $$$$ gear.I tried reaching Agilent but no path seems open without a contract or fee.Thanks.

author: saturation
author_rank: Super Contributor
timestamp: September 14, 2014, 05:46:39 pm
content: Put a fresh 9v battery in it, even if non-rechargeable, and power up. If it works, perform the basic operation tests at minimum, as specified in the manual, and if you have the gear, do performance tests. These tests insure all is well with the DMM. Its less likely the DMM has been damaged but without a schematic, you never know. The charge terminals are on the low amps terminal that will engage when the rotary knob is set to it, which is past the ohms setting, and likely will blow a fuse if it were set here during charging.Chances are the NiMH battery needs to be cycled as its been deep discharged.A simple way to restart the 9V NiMH is apply 8Vdc 40mA for 1 minute and then charge it in the DMM or use an external 9V NiMH charger instead. If the battery doesn't charge or fails the self test repeat 8V 40mA procedure for up to 5 minutes. If it fails, the battery is likely dead. If the battery charges up cycle it: charge full then discharge to 7V, 3 times.While Agilent likely would have designed shut down circuitry if the battery provided <= 7Vdc, the battery could also be permanently damaged as 9V NiMH are made of series 1.2V cells that could suffer polarity reversal if overdischarged.

author: Wing47
author_rank: Newbie
timestamp: September 14, 2014, 08:00:57 pm
content: Saturation, Thanks for the clear explanation and advise. I have installed a std 9v and it did power-up and pass SLFt. Appears normal. I'll do some more testing to confirm, but this is a great start! The original rechargeable unit is now 3 years old, so I'll use it for hacking, but I'll get a new one for the meter if my usage warrants, otherwise I'll keep throwing in a fresh 9v, and removing it when not in use. Thanks again!
CEM Professional AC/DC Clamp Meter - Page 1
Forum section: electronics / testgear

author: Ebivetar
author_rank: Contributor
timestamp: September 11, 2014, 09:43:34 pm
content: Hello,I was looking around for the top range fluke clamps and ended up on CEM-Instruments website.Clamp models DT-9380/981/9382/9383 are what I am interested in. Has any one used on of this clamp meters before? Where can I buy one?DT-9383 looks awesome, at least from the specs. It comes with bluetooth, trending and iFlex and can measure inrush current.Really hope that some one will enlighten me.edit: Forgot to post the link, here it is:http://www.cem-instruments.com/en/pro/pro-872.html

author: Lightages
author_rank: Unknown
timestamp: September 13, 2014, 02:20:45 am
content: CEM is the manufacturer for some other brands. Usually they just re-badge the meters with their name. Extech is one example. CEM has a mixed history of quality control but they seem to offer good features and specs for the money. If you get a good one you will probably be happy with it but getting a bad one seems to be more likely than with some other brands.
What memory size would you recommend for Rigol ds2202a? - Page 1
Forum section: electronics / testgear

author: John3210
author_rank: Newbie
timestamp: September 08, 2014, 05:53:56 pm
content: Would you recommend a memory upgrade from 14 Mpts capture to 56 Mpts?Also, have you found the extra trigger options useful?ThanksJohn

author: AntiCat
author_rank: Contributor
timestamp: September 09, 2014, 08:18:56 pm
content: If you buy a new DSO it should come with a 30? day trial periode.This gives you enough time to evaluate the benefits of the large memory.

author: WesleyK
author_rank: Contributor
timestamp: September 09, 2014, 08:51:25 pm
content: With rigol scopes its something like 1800 minutes.

author: wraper
author_rank: Unknown
timestamp: September 09, 2014, 08:56:23 pm
content: Why not just hack it and get all options including 300MHz for free.https://www.eevblog.com/forum/testgear/ds2000a-upgrade-utility/

author: marmad
author_rank: Super Contributor
timestamp: September 13, 2014, 02:08:37 am
content: Quote from: John3210 on September 08, 2014, 05:53:56 pmIt depends on your needs.The main advantage to the extra memory on the DS2000 is faster sample rates at slower time bases. With 14M, you can use the full sample rate (2GSa/s) down to 500us/div; with 56M, you can use the full sample rate down to 2ms/div. This means a higher bandwidth and more detail at slow time bases. For example, at 2s/div, the acquisition time is 28s. With 14M, the sample points are spaced 2us apart - with 56M, they are spaced 500ns apart.So the extra memory mainly comes in handy when working at slower time bases.But yes, the extra trigger options are very useful very often.
HP 8146A OTDR - Page 1
Forum section: electronics / testgear

author: Jef Brink
author_rank: Newbie
timestamp: September 08, 2014, 03:11:15 am
content: Anyone know where I can find schematics for a HP 8146A OTDR ? I have managed to find some online user manuals but no service manuals. The HP/Agilent/Keysight website has no info on the product.Any help would be appreciatedCheersJef

author: tautech
author_rank: Super Contributor
timestamp: September 08, 2014, 09:55:48 am
content: Have you checked the manual links in this thread?https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/

author: Jef Brink
author_rank: Newbie
timestamp: September 11, 2014, 08:18:18 pm
content: Thanks, I had checked out most of them, but there were a few sites I hadn't seen before. No luck though.
New Rigol 1052e still hackable? - Page 1
Forum section: electronics / testgear

author: LarsT
author_rank: Contributor
timestamp: September 09, 2014, 06:52:54 am
content: I've just recently bought a New Rigol 1052e scope, is it still possible to hack this into 100MHz?All tutorials I find on the subjects are 2+ years old and speculating that Rigol would prevent this on later batches.

author: Rubi Han
author_rank: Contributor
timestamp: September 09, 2014, 08:16:10 am
content: It should be 50MHz. Where is the scope used for? Any comments on this scope?

author: LarsT
author_rank: Contributor
timestamp: September 09, 2014, 10:31:46 am
content: Yes, it's originally 50MHz, however (at least) older models were possible to modify to sample at 100MHz.

author: miguelvp
author_rank: Super Contributor
timestamp: September 10, 2014, 01:26:55 am
content: This thread is still active as in 5 days ago:https://www.eevblog.com/forum/blog/changing-the-rigol-ds1052e-to-ds1102e-using-usb-the-dummy-guide/
Rigol DS and MSO 1000Z firmware update  - Page 1
Forum section: electronics / testgear

author: sptm14a
author_rank: Newbie
timestamp: September 15, 2014, 11:13:50 pm
content: Firmware update for DS and MSO 1000Z series. 00.04.01.02.00http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-04f1/1/-/-/-/-/DS1000ZUpdate.GEL
HM200 multimeter fuse - Page 1
Forum section: electronics / testgear

author: banedon
author_rank: Regular Contributor
timestamp: September 08, 2014, 08:30:23 pm
content: Hi guysA bit of a simple one, but this has got me perplexed.I purchased an HM200 multimeter from Farnell a little while ago (http://uk.farnell.com/digimess/hm200/multimeter-digital/dp/5019850) and have hardly used it. Today I've gone to test how much current is being pulled by an LED (approx 1-2mA - I'm trying to build a very simple address/data bus monitor) and found that it read 0... (my *very* old dial-based multimeter reads it fine)So, I've opened the meter and tested the smaller fuse inside. Nothing / no short. This explains the reading I have on the HM200.The thing is, I've never plugged anything into the A & mA probe sockets until today, have never tested anthing over 9V and haven't tested anything in parallel whilst testing for current. I also noticed that the fuse has nothing in it - when a fuse goes does it completely vaporise the innards? Under bright light plus magnifying lamp I see nothing inside at all: No loose/truncated wires - nada. It simply looks like a hollow glass tube with metals ends. It wouldn't have shipped with a placeholder / look alike would it?I'll buy another fuse (not form Farnell as they don't seem to have 500mA/250mA fast acting ones in 20mm x 5mm) but this has me slightly puzzled.

author: sonic2000gr
author_rank: Newbie
timestamp: September 08, 2014, 08:53:02 pm
content: Quote from: banedon on September 08, 2014, 08:30:23 pmNo. Seems you got the odd dud fuse. Just replace it and probably everything will be fine.

author: banedon
author_rank: Regular Contributor
timestamp: September 08, 2014, 08:57:03 pm
content: Thanks for replying. I can't seem to find a 500mA / 250V fast acting fuse in 20mm x 5mm size at Farnell or Mouser. Is this an unusual combination of statistics for a fuse? Ignore that: helps if I select the correct type (Cartridge)
Opinions on 5kW Sorensen SGA/SGI Series  - Page 1
Forum section: electronics / testgear

author: qwaarjet
author_rank: Regular Contributor
timestamp: September 09, 2014, 10:51:14 pm
content: I'm looking at purchasing a 5kW (160V 31A) Sorensen SGI constant current supply. I've used Sorensen DHP and DLM units in past and have no strong opinions on them. The DHPs don't have very good voltage stability at low voltages and the DLM tend to blow up( that may be my fault). Anyone used SGA/SGI in the wild or have experience with other high power constant current supplies.
Measure loop gain/phase with sound card - Page 1
Forum section: electronics / testgear

author: quist
author_rank: Newbie
timestamp: August 27, 2014, 07:28:27 pm
content: Has anybody used a sound card for measuring control loop stability on fx. power supplies? If so, what program did you use?I have tried different programs(REW v5, HOLMimpulse, and others) but they only support one channel measurement, but loop stability measurements require two channel measurements to be compared to get gain and phase. See picture below.

author: DaveW
author_rank: Frequent Contributor
timestamp: August 27, 2014, 10:56:33 pm
content: Not a sound card, but Analog Discovery from Digilent works pretty well for stability measurements. Reasonably cheap as well for students if you fall into that category

author: rbola35618
author_rank: Frequent Contributor
timestamp: September 01, 2014, 11:59:19 pm
content: You can use a function generator and a scope to measure the gain and phase.

author: jahonen
author_rank: Super Contributor
timestamp: September 06, 2014, 08:19:14 pm
content: ARTA's STEPS works quite well for this if you can accept the limited bandwidth. I have debugged some power supply feedback loops using that. Here is one case how it turned out, measured using ARTA:Regards,Janne

author: rfbroadband
author_rank: Unknown
timestamp: September 08, 2014, 02:40:45 am
content: you can use an ARB and scope do these measurements.

author: quist
author_rank: Newbie
timestamp: September 08, 2014, 12:56:33 pm
content: Thanks everybodyI'm afraid that I would die a slow death if I were to measurethe loop with a scope, so I continued to lookJahonen: After hours of searching the other day i stumbled upon the Arta Steps SW, and i worked fine. And it can go to more than 20kHz if your sound card supports itThanks for sharing you measurement

author: pinkman
author_rank: Regular Contributor
timestamp: September 08, 2014, 07:30:53 pm
content: Quote from: quist on September 08, 2014, 12:56:33 pmLook at Ridley Engineering. Ray makes some great stuff for this.
The Fluke 28 blew a hole in its chip... - Page 1
Forum section: electronics / testgear

author: cybertronicify
author_rank: Regular Contributor
timestamp: September 08, 2014, 10:09:37 am
content: At 11:39 is that a huge hole at the center of the chip? (U2)I thought the MOV's will protect the meter and avoid that from happening.

author: EEVblog
author_rank: Unknown
timestamp: September 08, 2014, 10:15:29 am
content: Not at that sort of energy level. The meter is designed to fail safe, not be protected and still work afterwards.
Software/Equipment for measurements and datalogging - Page 1
Forum section: electronics / testgear

author: nickm
author_rank: Regular Contributor
timestamp: September 07, 2014, 10:10:33 pm
content: I'm looking for software and/or equipment to do sweeps and various measurements. The equipment I have which would be able to connect:GPIBHP 3478A metersHP 8904 function generator8903 generator/analyzerRS232Tek TPS2014 scope.The tests I would like to do are measuring output voltage while sweeping frequency or input voltage, voltage or current versus time, etc.The three paths I've looked at are:RigolPros: equipment is affordable.Cons: I'd have to buy all new equipment, and I can't figure out if they have decent software.Cost: 1000 - 1500 depending on if they have software.AgilentPros: Benchvue looks like a great free tool that does exactly what I want.Cons: I'd have to buy all new equipment.Cost: 2000 - 3000National InstrumentsPros: Can interface with existing equipment (I think)Cons: I'm not sure the price of the software that will do what I want but it might be really expensive.Cost: GPIB cables and interface + whatever the software isSo given what I have and what I would like to do, what do you think the best route to take (Of course not restricted to the three I came up with, there must be a better solution that I'm missing)?

author: Fsck
author_rank: Super Contributor
timestamp: September 07, 2014, 10:36:41 pm
content: have you considered an gpib-usb adapter + writing your own scripts? this will be the cheapest option and probably the most time consuming.the tradeoff is time vs $$ vs flexibility for your possible solutions.if time is most important, benchvue is probably the best solution. can't really beat turnkey in speed.
ut61e replacement fuses - Page 1
Forum section: electronics / testgear

author: ZenDawgg
author_rank: Newbie
timestamp: September 07, 2014, 02:53:47 am
content: Hi,Can someone tell me where I can get replacement fuses (both 1A and 10A) for the UT61E in the States, or recommended a safe and suitable replacement?I see BS1362 (1A) and BS1362 (10A) on the fuses, but a Google search didn't bring up much.Thanks.Zen

author: ZenDawgg
author_rank: Newbie
timestamp: September 07, 2014, 03:05:37 am
content: Found 10A on Ebay, still need the 1A version.Thanks.

author: ZenDawgg
author_rank: Newbie
timestamp: September 07, 2014, 03:15:08 am
content: Sorry to bug everyone, guess I should have searched a bit longer before posting.I found both, on Ebay from a UK Seller. $8.26 per 50Thanks.
Vito IR Oscilloscope V2.4 - Page 1
Forum section: electronics / testgear

author: h1386343
author_rank: Regular Contributor
timestamp: September 07, 2014, 03:05:27 am
content: Here is a link to "Vito IR Oscilloscope" version 2.4:https://www.sendspace.com/file/mogpk5This amazing program for Pocket PC 2002/2003 (iPAQ etc) allows you to capture/analyse & replay IR commands from remotes etc. I just bought 2 iPAQ H5XXX series devices from eBay for £10, and this app works FAB.
External DC Block to protect SA - Page 1
Forum section: electronics / testgear

author: sorenkir
author_rank: Regular Contributor
timestamp: September 05, 2014, 04:27:43 pm
content: Hello Group,I have a Tek 492 SA on its way. I plan to protect its input with an external DC block.I see no-name DC Blocks (6GHz, which is OK for me) at about 16 USD on eBay :http://www.ebay.com/itm/330923176286Or more expensive Jyebao branded :http://www.ebay.com/itm/271253716795What do you think of these ?Thanks,Michel.

author: swingbyte1
author_rank: Contributor
timestamp: September 06, 2014, 08:54:39 am
content: Hi ,I'd get the cheap one and see how it goes. Just make sure its an inner and not an outer block. If it doesn't have a flat enough response - then get the expensive one.Tim

author: G0HZU
author_rank: Super Contributor
timestamp: September 06, 2014, 02:47:25 pm
content: It depends if you ever want to go higher in frequency than 6GHz. Also, you need to be wary of the lower frequency limit as the VSWR can degrade a lot at low frequencies. Some DC blocks only work well down to 10MHz for example.Also, you need to consider the amount of use it will see because a cheap connector will (usually) not have the same quality in terms of fit and plating type and finish. I try and avoid using cheapo N connectors and try and use Suhner or other high end brands because I hope they will (mutually) achieve a longer life in terms of mating cycles before the performance degrades up in the GHz region.A few years ago I bought an N type DC block for my 22GHz HP8566B and it was a high quality unit. The spec is LF to 18GHz and 100V (may have been 200V, I can't remember)If I measure it on a 3GHz VNA here it shows VSWR <1.06:1 from 1MHz to 3GHz and a loss of <0.3dB at 3GHz. It works down to a few kHz but the VSWR degrades a fair bit by then.I 'think' it's a Suhner branded DC block and because it works from a few kHz to 18GHz I leave it in line as much as possible.So my advice would be to also consider other (better known) brands with a reasonable quality finish. Minicircuits do some basic 6GHz DC blocks with a decent datasheet plus supporting graphs for about $30.
Atten 1102 - switch language from chines to english - Page 1
Forum section: electronics / testgear

author: zerobrain
author_rank: Contributor
timestamp: September 05, 2014, 02:46:29 pm
content: Hi there,i just got me that atten DSO but it is running in chinese and i din´t get it to switch to english yes.I had a look at the manual, but it doesn´t describe what excatly to put in.I know i have to use "utility" and the forth item from abobe - but what next?Can please anybody help me out with this?all the bestDominik

author: Deckert
author_rank: Regular Contributor
timestamp: September 06, 2014, 01:08:14 am
content: Quote from: zerobrain on September 05, 2014, 02:46:29 pmAfter pressing the Utility button, it is the 4th item down on the Menuof Page 1. There are 4 pages. The just scroll with the all-purpose selection knob till you get to the English selection.--deckert

author: zerobrain
author_rank: Contributor
timestamp: September 06, 2014, 05:44:44 am
content: Worked. Thanks very very much!
Possible to reverse changes made after unlocking a Rigol oscilloscope ? - Page 1
Forum section: electronics / testgear

author: ninjastrike
author_rank: Contributor
timestamp: September 06, 2014, 03:55:04 am
content: Hi,Just got a rigol Ds1074z, I want to unlock all the features, but am not sure if it would void my warranty.Is it possible for me to revert back to the original settings after unlocking the features?Cheers!
COTS constant current supply Needed to replace old NASA equipment  - Page 1
Forum section: electronics / testgear

author: qwaarjet
author_rank: Regular Contributor
timestamp: September 06, 2014, 03:15:23 am
content: I have a custom 1KW adjustable/programmable constant current switching power supply and it is becoming expensive for me to repair and maintain. It also be hacked by about a dozen people over the years and some of the part are expensive/ difficult to find. So Im trying to find a COTS supply that could do the job.My current supply can supply .5-12 Amp at an open circuit voltage of 170VDC. It looked like this at one timehttp://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19860015937.pdfOne key requirement is that it needs to be a true CC supply and not a constant voltage supply that has a CC limit. Reason being CV supplies tend to have "large" output capacitance that can supply very large surge currents. My current supply has "no" output capacitance and has a high output inductance instead.Any recommendations?
Tektronics THS 720std 100Mhz (Tekscope) Digital real time 500MS/s channel - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: September 05, 2014, 10:51:09 am
content: I got a Tektronics Tekscope THS 720std 100Mhz (Tekscope) Digital real time 500MS/s channelNot sure if I got ripped off due to the amount of Shill bidding on Ebay. Anyway I got it for 170 pounds with lots of other stuff thrown in 3 x p5102 probes probes etc and other bits.I was just trying to find out a bit about the scope. The model has software version V1.03.So I take it this version of the scope is older than the THS720A is this right?What do I need to check with this DSO to make sure its all ok?Thasnks for your help

author: David Hess
author_rank: Super Contributor
timestamp: September 05, 2014, 02:11:34 pm
content: Quote from: R_G_B_ on September 05, 2014, 10:51:09 amThis is likely enough. You might find out more by downloading the THS720 and THS720A manuals and comparing them for differences.QuoteA fast edge generator to check transient response will reveal obscure problems. A function generator with calibrated frequency and amplitude will work for basic tests.

author: marshallh
author_rank: Unknown
timestamp: September 05, 2014, 03:31:43 pm
content: the A rev I believe simply has the option of trigger input thru the multimeter banana jacks.The latest firmware for A rev is 1.18 i think. So you could be far behind. I have no idea how you'd upgrade the firmware, besides manually copying the flash chip.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: September 05, 2014, 04:19:11 pm
content: I could not find any manuals for the scope or anything all this makes sense now as there were no geuine bidders. So looks like I got a bad deal!
Teardown UEI DM383  - Page 1
Forum section: electronics / testgear

author: chipwitch
author_rank: Frequent Contributor
timestamp: March 19, 2014, 09:30:08 pm
content: I wouldn't have posted this but for the request of another member. We were discussing it in another thread and he "shamelessly" pleaded for it. So, I thought I'd post it here in case anyone else was interested.This is an older model, not the "B" version I've seen on eBay. Can't tell you what the difference is, if any, but after tearing it down, I'm actually impressed. When I bought it 20 years ago, I'd just had my Fluke stolen and needed a quick replacement. This is what the supply house had for not too much money. Thought I got ripped off then, paying $70 IIRC, but it was about a third the cost of a Fluke. Overall, I've been pleased with it. Aside from the outer bumper cover being hard has hell to get on and off, it's been good to me. It's been tossed, dropped and sat on and not a moments grief until I apparently applied to great a current to the ammeter and blew a fuse. The teardown gave me the opportunity to clean it, though the inside was impressively clean. The gold contacts are as shiny as new. I wonder if they're still using gold contacts? It may just be plate, but it's held up well.I haven't had the reason or occasion to calibrate it. Can't tell you how accurate it is. But it's always read pretty much exactly what I expected. My recent venture into electronics has given me the opportunity to measure values that I know more precisely, variable voltage regulators for one. Every reading of the adjust to output voltages has been +/- .02 volts of the 1.25v reference. Close enough for this hobbyist.Anyway, enjoy.PS... just noticed, I put the rubber bumper back on upside down. NO, that ISN'T the reason its hard to get on and off. It's gotten very hard and inflexible over the years.

author: chipwitch
author_rank: Frequent Contributor
timestamp: March 19, 2014, 09:31:21 pm
content: Part Deux, the best part.

author: idpromnut
author_rank: Unknown
timestamp: March 19, 2014, 11:24:05 pm
content: Nice! And I wonder what that black wire soldered in the middle of the 10A shunt is for?

author: chipwitch
author_rank: Frequent Contributor
timestamp: March 19, 2014, 11:33:52 pm
content: That's the shunt??? I thought that was theroll bar!

author: Radio Tech
author_rank: Frequent Contributor
timestamp: September 05, 2014, 12:44:44 pm
content: Quote from: chipwitch on March 19, 2014, 11:33:52 pmLOLchipwitch,You have the part number on that MOV?I managed to smoke mine.Crashed and burn, maybe the roll bar did not hold up.

author: Wytnucls
author_rank: Super Contributor
timestamp: September 05, 2014, 03:16:08 pm
content: http://industrial.panasonic.com/www-data/pdf/AWA0000/AWA0000PE18.pdfOne of those should do, if you don't have a part number.

author: Radio Tech
author_rank: Frequent Contributor
timestamp: September 05, 2014, 04:03:42 pm
content: Thanks!
Oscilloscope input attenuation - Page 1
Forum section: electronics / testgear

author: aland
author_rank: Newbie
timestamp: September 05, 2014, 12:28:42 pm
content: The input options on a Rigol (and many others I imagine) include an attenuation ranging from <<1 to >>1.1x and 10x probes and their effects on impedance and why 10x (or higher) is necessary as frequency increases I understand.But what is the attenuation doing? Is it also altering input impedance or just a gain or display scale beyond the input seen by the probe? The manual gives no clue so I presume it well know to those with greater experience of scope measurements.

author: omgfire
author_rank: Regular Contributor
timestamp: September 05, 2014, 01:31:36 pm
content: w2aew's video:

author: aland
author_rank: Newbie
timestamp: September 05, 2014, 02:14:06 pm
content: So the attenuation only scales the volts/div numbers displayed on screen. The options ranging from x0.001 up to x1000 are mostly redundant and only the x10 useful if I only have a x10 probe.Also changing this attenuation has no influence on the load the probe presents to the circuit.Is that right?Thanks

author: w2aew
author_rank: Super Contributor
timestamp: September 05, 2014, 02:46:48 pm
content: Quote from: aland on September 05, 2014, 02:14:06 pmCorrect - it only changes the numbers on the screen to be correct with a given probe. The load presented to the circuit is entirely dependent on the probe being used. Some higher speed scopes give you the ability to change the *scope's* input impedance between the standard 1Mohm and 50 ohm, but that's another subject.

author: David Hess
author_rank: Super Contributor
timestamp: September 05, 2014, 03:04:34 pm
content: Quote from: aland on September 05, 2014, 12:28:42 pmUsually oscilloscope attenuator alters just that, attenuation, without changing active gain or display scale. The input impedance needs to remain constant or the probe compensation will be affected by oscilloscope attenuation changes.It is difficult to alter active gain without changing transient response and bandwidth. Old analog oscilloscopes which do this at their highest sensitivities usually lower their bandwidth either a little or a lot and require separate calibration.DSOs and especially cheap DSOs may sacrifice ADC resolution to implement some vertical scale factors. It annoys me when they lie about this in their specifications. If you are throwing out bits and dynamic range at some attenuation settings, then your oscilloscope does not have the same resolution at all vertical input scale factors. USB oscilloscopes are especially bad about this.The old Tektronix 2440 DSO does this to get scale factors of 200 uV/div, 500 uV/div, and 1 mV/div from 2 mV/div but forces averaging mode so at least it is apparent when it happens and the documentation provides details.