hybridfree/eevblog-posts huggingface dataset:
HP Infinium 500MHz 1GS/s how much should I pay  - Page 1
Forum section: electronics / testgear

author: Miti
author_rank: Super Contributor
timestamp: April 16, 2019, 03:36:11 pm
content: Someone is selling a HP Infinium as described in the title. The ad sounds like this:"System in damaged , unsure if working 100% , came with company purchased inventory , make an offer !"I asked for a picture with the self test and he asked my email to send it so that means it is not dead but I'm not sure what kind of damage it has. How much should I offer? What kind of issues do these scopes have? Is it worth the money and time? It is a 500MHz scope after all but not having any experience with hp scopes I don't know what to beware of.Thanks,Miti

author: DaJMasta
author_rank: Super Contributor
timestamp: April 16, 2019, 04:15:25 pm
content: What model? 1GS/s sounds like an older one, maybe first generation Infiniium? Maybe 54815A?Ebay's start at $850 in working condition, but honestly that's more than I'd pay - partly because comparable LeCroy's are going to be cheaper.If it's broken, especially if in a non-functional way.... that's highly variable. I would go in for no more than a couple hundred bucks, and only if you either already had a parts unit to pull from or if you had a good idea what the failure was and that it could be fixed with available parts. You'll definitely find people willing to pay more, and I think on such a gamble as not being able test it out, not knowing the internals well, and not having a ton of available replacement parts.... I wouldn't.

author: Miti
author_rank: Super Contributor
timestamp: April 16, 2019, 11:54:44 pm
content: Here's the link. I don't see a model number on the front plate but it does seem to be an old model. I think I could test it but I don't really know what to look for other than running a self test and eventually a self cal.https://www.kijiji.ca/v-view-details.html?adId=1426817253

author: Someone
author_rank: Super Contributor
timestamp: April 17, 2019, 12:35:09 am
content: More than half the value could be hiding inside the bag of probes! Those are big, noisy, slow, and have very little memory compared to modern alternatives:http://www.testequipmenthq.com/datasheets/Agilent-54815A-Datasheet.pdf

author: Miti
author_rank: Super Contributor
timestamp: April 17, 2019, 02:00:25 am
content: Thanks DaJMasta and Someone, I think I'll pass.

author: Brumby
author_rank: Unknown
timestamp: April 17, 2019, 03:37:15 am
content: "Starting Windows 95..." Yeah, there's some age there.
Siglent SDS1204X-E Trace Colors - Page 1
Forum section: electronics / testgear

author: rstofer
author_rank: Super Contributor
timestamp: April 24, 2019, 11:57:43 pm
content: I was just watching a video of the Bode' Plot feature of this scope and one of the traces appeared to be red. Red on a black background is a show-stopper for me, I don't see red very well and I see it less well on a black background. What are the trace colors for the Siglent SDS1204X-E?The Rigol DS1054Z uses yellow, cyan, magenta and blue - no problems.

author: BillB
author_rank: Unknown
timestamp: April 25, 2019, 12:31:32 am
content: The SDS1104X-E is basically the same scope and it uses yellow, magenta, cyan and green (math is white). Check out this in-depth review thread has plenty of pictures:https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-in-depth-review/

author: tautech
author_rank: Super Contributor
timestamp: April 25, 2019, 01:02:41 am
content: Quote from: rstofer on April 24, 2019, 11:57:43 pmThey are as Bill describes however for Bode plot the reference trace is user definable and the reference trace is never visible.Trace assignment in Bode plot mode is the 'fix' for a trace color that is hard to see.In normal scope use with the latest FW, any trace can also be hidden for say Trigger or Math usage.

author: rstofer
author_rank: Super Contributor
timestamp: April 25, 2019, 01:40:37 pm
content: Thanks guys!That SDS1204X-E gets closer and closer...
Can different wifi adapters be used with SDS1104X-E? - Page 1
Forum section: electronics / testgear

author: Coldblackice
author_rank: Contributor
timestamp: March 06, 2019, 12:09:03 am
content: I see that the recommended/official wifi adapter for the Siglent SDS1104X-E is the TP-Link TL_WN725N, but I'm wondering if a TL-WN722N could be used instead?I currently have this adapter already and use it for other projects, and it'd be great if I could use it with the scope vs. buying a TL_WN725N. I know it's not terribly expensive and can be had for cheap, but ideally I'd prefer cutting down on devices, if possible.My thought is that given they're so close in model, it could work, but I'm not sure if the scope has a singular predefined "driver" that will only work with the 725N or its specific chipset. If there was a way to mod the scope to change out its wifi adapter compatibility/driver, I would happily attempt that, if possible.

author: tautech
author_rank: Super Contributor
timestamp: March 06, 2019, 12:53:15 am
content: There can be no harm in trying your 722.With the scope running you're flagged a note on the display when a WiFi adapter is inserted into the USB socket.If the scopes SW doesn't recognize your 722 it will probably tell you it is not supported or it will just work.Good luck and remember to tell us how you got on.

author: Coldblackice
author_rank: Contributor
timestamp: March 06, 2019, 09:11:53 pm
content: Sounds good, thanks for the info. I'll report back as soon as the scope arrives.

author: Old Printer
author_rank: Frequent Contributor
timestamp: April 16, 2019, 04:31:15 pm
content: Quote from: Coldblackice on March 06, 2019, 09:11:53 pmAny word on this? My 1104x-e should ship today, Saelig finally got some in, so I would like to order a WIFI adapter online somewhere. I know I have seen a few that others have found to work. I am searching the threads now, but if anyone has a good US source for a generic one that is known to work that would be great. Thanks.UPDATE: I have found that the TP Link brand TL-WN725N WiFi USB Dongle is the same dongle that Siglent rebrands. Actually they don't even bother rebranding it, they just use the TP Link product and call it their own for $69. Siglent even uses the TL WN725N product number. The TP Link brand can be purchased through Amazon, OfficeMax and many other sources for about $10.
TDS220 & TDS210 EPROM swap - Page 1
Forum section: electronics / testgear

author: gkmaia
author_rank: Frequent Contributor
timestamp: March 25, 2019, 01:07:00 am
content: Is the only difference between the 220 (100MHZ) and 210(60MHZ) the programmed CMOS EPROM?The IC #s, board layout, they are all identical. Absolutely no difference.Has anyone ever tried to swap the eprom from a 220 into a 210?

author: bitseeker
author_rank: Super Contributor
timestamp: March 25, 2019, 03:33:26 am
content: One person tried the hack described inthis thread, but it didn't stick even with a full re-calibration.

author: EEVblog
author_rank: Unknown
timestamp: March 25, 2019, 06:53:16 am
content: Good question. You wouldn't think someone would have hacked probably the most popular scope in history...

author: gkmaia
author_rank: Frequent Contributor
timestamp: March 28, 2019, 09:44:46 am
content: I got a TDS220 eprom and installed on a TDS210 board.The result is:- Boot screen says it is a TDS210, not a 220.- Boot screen failed the factory calibration- When trying to self calibrate it exits the calibration procedure.So the PCB has a 210 identification markup... now I have to find this thing...

author: coromonadalix
author_rank: Super Contributor
timestamp: March 28, 2019, 10:18:46 am
content: maybe some smt resistor values ??

author: TERRA Operative
author_rank: Super Contributor
timestamp: March 28, 2019, 12:29:29 pm
content: On a similar note, what is the latest known firmware for the 210 and addon modules?Is it worth the effort to upgrade firmware to a later version if it was available?

author: gkmaia
author_rank: Frequent Contributor
timestamp: March 29, 2019, 01:12:05 am
content: Quote from: coromonadalix on March 28, 2019, 10:18:46 amAll resistors front and back around the processor block are exactly the same. I will investigate more. Maybe something around the acquisition block?

author: gkmaia
author_rank: Frequent Contributor
timestamp: April 16, 2019, 08:22:00 pm
content: Anyone with a faulty TDS 220 or 210 board to sell? So I can put it apart and proceed with my experiments?
Vintage Philips GM3153 Kathograph (Oscilloscope) late 1930's - Page 1
Forum section: electronics / testgear

author: Weds
author_rank: Newbie
timestamp: April 15, 2019, 03:49:47 pm
content: HiThought you might like to see a vintage Oscilloscope from around the late 1930's made by Philips in the Netherlands. I've inherited this from my father, he used to be a what we'd call a Electronic hobbyist. I've no idea where he got this from but probably a surplus store somewhere. He's changed out some of the capacitors to some more modern (at the time) there around 400v rating.Have I turned it on.... No. Very reluctant to put a supply on it as the caps and valves are probably very fragile. Even though some of the caps have been changed they were probably done over 30 years ago, so probably need changing again. I don't recall having seen it working so I'm not even sure it would work anyway. I have found an instruction book with circuit diagram online..

author: rsjsouza
author_rank: Super Contributor
timestamp: April 15, 2019, 05:23:37 pm
content: Wow... A very nice oscilloscope indeed. I love the old Philips logo with the stars.If only the capacitors didn't leak... I would be very torn between keeping the original look or repairing it.I have an early 1940s Philips radio that shares a few common traits, such as the voltage switching dial, the mains socket and the base of the yellow valvo tubes.

author: //Matt//
author_rank: Contributor
timestamp: April 16, 2019, 03:35:37 pm
content: Very interesting.It's always cool to look at really vintage electronics.
Changing 'scope probe readout pin resistor? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: April 16, 2019, 01:25:41 pm
content: I have an old Coline M20 'scope probe (IIRC 350MHz). It's fitted with a multiplier readout pin and resistor. The problem it would seem that the resistor is the correct value for 100x (6.75k) not for 10x even though the probe is a 10x probe.Here's a piccie of the 'scope end of the probe after I disconnected it from the cable:How the heck do I get in there to replace the resistor without destroying it? I'm sure it is possible, but I can't work it out!ThanksDavid
Blank screen on GM328 Tester after MCU re-programming  - Page 1
Forum section: electronics / testgear

author: sdancer75
author_rank: Frequent Contributor
timestamp: March 27, 2019, 10:26:47 am
content: I tried to re-program a problematic GM328 that was not possible to calibrate.No matter what mega328_GM328 version I used fromhttps://www.mikrocontroller.net/svnbrowser/transistortester/I always get a white blank screen. The fuses I used are: lfuse=0xF7 hfuse=0xD9 efuse=0xFFI even tried the versions below without success.GM328_EZM_v1.12k_r464_EN.zipGM328_EZM_v1.12k_r508_EN.zipGM328_EZM_v1.12k_r541.zipAny recommendations?Regards,

author: sdancer75
author_rank: Frequent Contributor
timestamp: April 15, 2019, 05:09:23 pm
content: The problem solved, I had to use the color version named "mega328_color_kit"https://www.mikrocontroller.net/svnbrowser/transistortester/Software/trunk/mega328_color_kit/
Fluke 8845 - is there is a "fast max" - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: April 15, 2019, 04:01:52 pm
content: I'm used to using the fast max feature on my 289 to try to capture quick currents, like a multiplexed LED being driven at 10% duty cycle. I tried to change the measure speed to the fastest and use the max/min/avg options, but I don't think it was right.
HP 16700 - MC68000 probe (E2477AA) UDS/LDS delays - Page 1
Forum section: electronics / testgear

author: philpem
author_rank: Frequent Contributor
timestamp: January 18, 2019, 08:26:37 am
content: Hi,Does anyone know how much the HP E2477AA (https://literature.cdn.keysight.com/litweb/pdf/E2447-97002.pdf) probe delays the UDS and LDS signals by?I'm planning to probe a 68000 system but I need to build an adapter as the E2477AA is for PGA parts and this is a DIP-packaged 68000. To do this I need to know what the HP probe does. HP specified the wiring, but not the delay on UDS/LDS.ThanksPhil.

author: TK
author_rank: Super Contributor
timestamp: January 18, 2019, 01:10:52 pm
content: Why not you use the standard HP / Agilent logic analyzer POD for probing the 68000?http://literature.cdn.keysight.com/litweb/pdf/16760-97016.pdf

author: DaJMasta
author_rank: Super Contributor
timestamp: January 18, 2019, 06:12:35 pm
content: Does it actually matter? I'm seeing 68000 series parts to 200MHz or so, which means even the fastest buses can tolerate a couple inches of copper worth of skew or delay.That is, unless you're using your LA with a pattern generator as a full ICE, where the distance would count for a lot more because you are also injecting signals. If you're just monitoring pins, it shouldn't be of any concern how the delay is unless you're synchronizing to an external source, in which case you just need the offset from it.

author: philpem
author_rank: Frequent Contributor
timestamp: April 17, 2019, 09:54:44 pm
content: Quote from: TK on January 18, 2019, 01:10:52 pm1) Because they don't come up for sale often2) Because you can't use them with the DIP-packaged 68000, unless you have the adapter - which was a bloody expensive Emulation Technologies custom job.Quote from: DaJMasta on January 18, 2019, 06:12:35 pmThe probe pod delays the data strobes slightly - I assume this is to guarantee setup/hold times on acquisition.So the question is, how long that delay needs to be. I can make an educated guess at a few nanoseconds (i.e. a pair of 74HC04 gates), but it'd be nice to know the real number.

author: gslick
author_rank: Frequent Contributor
timestamp: April 18, 2019, 02:30:30 am
content: Do you have a E2477AA 68000 preprocessor and you have some questions about it, or do you not have one and you are considering building an equivalent?I have 10311B (64670A) 68000/68010 preprocessor that attaches to a 10269C for use with DIP-packaged 68000/68010. I don't have a service manual with schematics for it, but if there are some questions about it that could be answered by visual inspection I could take a look

author: philpem
author_rank: Frequent Contributor
timestamp: April 18, 2019, 07:55:29 pm
content: I'm trying to build a functional equivalent -- as I said above, I can't get an E2477AA, but I do have a bunch of the 01650-63203 transition adapters.There isn't a schematic set for it, as far as I'm aware. Just the operations manual. As far as I can tell the repair procedure was "buy a new one".
How to ignore initial power on spike in single mode (Rigol) - Page 1
Forum section: electronics / testgear

author: loki42
author_rank: Frequent Contributor
timestamp: April 14, 2019, 02:13:52 pm
content: I'm attempting to use my Rigol DS1054Z oscilloscope to work out why my MIPI DSI connection isn't working. Obviously a challenge is the high clock speed but I'm keen to check the lower clock stuff like TE and the reset line and this all changes on start up. How should I set the scope to single trigger mode but ignore the first spike from powering on? Is setting up a pulse trigger the right way? Is there a discussion anywhere on what to use the different trigger modes for?

author: Fungus
author_rank: Super Contributor
timestamp: April 14, 2019, 07:48:00 pm
content: Quote from: loki42 on April 14, 2019, 02:13:52 pmThere's a fine manual...
BWD 539C Oscilloscope - Page 1
Forum section: electronics / testgear

author: Eddiex
author_rank: Newbie
timestamp: April 14, 2019, 07:40:56 am
content: Hello people!This is my first postI recently bought my first oscilloscopea BWD 539C that looks in a really good shape.Last night after playing around doing some tests with my signal generator I noticed that after I put the generator away tthe scope kept showing some sort of signal but not a sine wave but a very deformed wave in the same position I used for playing with the generator... So thats my question... What do you think is causing this? Could it be the charged big capacitors in the generator? Or my led lights? Or an internal fault in my oscilloscope?ThanksEdgar

author: tautech
author_rank: Super Contributor
timestamp: April 14, 2019, 08:23:23 am
content: Probably just mains RFI from your surrounding appliances.You can find the manuals for the 539's here:https://www.kevinchant.com/bwd.html

author: Eddiex
author_rank: Newbie
timestamp: April 14, 2019, 09:50:04 am
content: Thanks
Looking for: Tektronix TX3 IR interface cable and serial commands/protocol specs - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: March 12, 2019, 10:12:45 am
content: I'm looking for an IR interface cable for my TX3 DMM.Either a DIY design or an existing cable.And also documentation of the commands to control and read data from the meter.

author: Jimkoz
author_rank: Newbie
timestamp: April 14, 2019, 04:19:03 am
content: The TX3 can use the same cable as the Fluke 18x series meters. I believe it’s the IR189USB, but you can sometimes find a serial version on eBay.FlukeView Forms will also work with the TX3. The software recognizes it as a Fluke 183/185, which are what the Tektronix TX1/TX3 were sold as in Europe.

author: Jimkoz
author_rank: Newbie
timestamp: April 14, 2019, 05:57:51 am
content: The Fluke IR189USB uses a receptacle with a long "tongue" that slides into a slot in the Fluke boots. My TX3 was missing the original receptacle that fits inside of the boot, so I cut off the tongue on the Fluke receptacle and attached it to my TX3 boot with some small machine screws.You'll see from the attached image that my cable is the old RS232 serial version.

author: Jimkoz
author_rank: Newbie
timestamp: April 14, 2019, 06:16:27 am
content: Attached is a MATLAB file that I use to read from my TX3. I had to give it a ".txt" extension to upload it.The only commands that I've found to be useful are:!K? = Rotary switch position!M? = Value on main display!U? = Value on upper displayCommunication Parameters:Baud Rate = 9600Terminator Character = Carriage ReturnFlow Control = "Hardware"Data Bits = 7Stop Bits = 1Parity = "Even"
Itech IT8511+ electronic load - what does "Current range" mean for battery test? - Page 1
Forum section: electronics / testgear

author: DefinitelyNotLarryEllison
author_rank: Contributor
timestamp: April 05, 2019, 11:29:32 pm
content: My Itech load has a decent battery test feature. I fully understand all of the settings but one - when setting up the test, it asks for a "current range." I've read the manual and there's zero explanation of what it actually means - it just says "...set current range." I've tried a couple of different settings and run the test with a lipo battery, but I can't tell what the heck this current range actually does.Does anyone know what that setting means?

author: BillB
author_rank: Unknown
timestamp: April 06, 2019, 12:38:59 am
content: Because that is using CC, isn't the range selection used to set the resolution?

author: DefinitelyNotLarryEllison
author_rank: Contributor
timestamp: April 12, 2019, 11:25:49 pm
content: If I'm understanding things correctly, then it's got no other function than to just allow the instrument to measure current more accurately during the test.That would make sense, I guess. Thanks!
Value display is not stable - Page 1
Forum section: electronics / testgear

author: hongthiet1994
author_rank: Contributor
timestamp: April 12, 2019, 08:10:49 am
content: I have a DMM 12gw eevBlogI do not know my DMM was error or normalMay be show your DMM ?Thank you so muchhttps://youtu.be/E6-Pspjto0g

author: BravoV
author_rank: Super Contributor
timestamp: April 12, 2019, 08:18:44 am
content: Its normal, as the input is very sensitive when opened.Try short both probes.

author: Psi
author_rank: Super Contributor
timestamp: April 12, 2019, 08:24:42 am
content: Yep, its picking up RF/EMF noise in the air.Totally normal.Should go to solid zero when you short the probes together.Some meters have added hackery/code to try and show 0.0000 if it looks like very small noise, but this is bad because if you actually have a very low signal your meter may lie to you and says its zero.

author: Brumby
author_rank: Unknown
timestamp: April 12, 2019, 01:06:32 pm
content: This is absolutely normal, especially for low range readings and floating probes.
VIZ WP-29A Manual/schematics - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: April 12, 2019, 03:26:05 pm
content: Hello All,I am not good at searching for manuals on-line. I get tricked in to added a manual chrome extension and then to find out they don't have the one I am searching for.Does anyone have a PDF of the schematics for a VIZ WP-29A that they would be willing to share? If you have the manual, could you scan in the schematics page?Thanks kindly,Dave
Any update on Rigol DG4000 series hacking? - Page 1
Forum section: electronics / testgear

author: unimorpheus
author_rank: Regular Contributor
timestamp: February 01, 2016, 10:44:51 pm
content: Title says it all. The last threads I read seemed to fail with the new boot loader/firmware versions shipping in current DG4000 series generators. Any update on DG4000 series hacking or is it still a no go?

author: unimorpheus
author_rank: Regular Contributor
timestamp: February 03, 2016, 11:57:47 pm
content: bueller, ....bueller, ....bueller

author: cincir
author_rank: Newbie
timestamp: April 12, 2019, 10:49:30 am
content: I also want to ask the same. I bought DG4062 thinking that I can upgrade but it has the bootloader version 06.02. Any news?
Best low cost null voltmeter? - Page 1
Forum section: electronics / testgear

author: maginnovision
author_rank: Super Contributor
timestamp: April 11, 2019, 08:00:21 pm
content: So I have been looking for a null voltmeter but I'm finding multiple things. I don't know which are good, which have good value for money, or which are even available as keithley and fluke seem to have many. Is battery powered or AC powered better? Does anyone have a recommendation for a used null voltmeter? I'd prefer to keep cost under $300-400 USD but if that's not possible so we it. I will say I like the idea of the fluke 335D being so flexible in it's use so if it's something like that I would of course pay extra for it. Is the fluke 335D's null voltmeter function comparable to dedicated units?
Question about the Keysight DSOX1000 series. - Page 1
Forum section: electronics / testgear

author: Housedad
author_rank: Frequent Contributor
timestamp: April 10, 2019, 02:26:38 am
content: I feel like this is a stupid question, But I'll ask it anyway. It will be a couple of months before I get my hands on one.Looking at the back of the oscilloscopes, on the upper left side, there are a couple of deep indents molded in the case. The manuals don't mention anything about them.What are they there for?

author: ataradov
author_rank: Super Contributor
timestamp: April 10, 2019, 02:54:35 am
content: If I understand you correctly, then it is a one through hole for the security cable. You need this kind of stuff you you are installing them in a shared lab or a university/school lab.The hole starts on the back, then turns and exits on the side.
50 MHz Scope + 100 MS/s Data Logger? or SDR? - Page 1
Forum section: electronics / testgear

author: 小太
author_rank: Contributor
timestamp: April 11, 2019, 12:22:56 am
content: I'm a hobbyist looking to buy an oscilloscope and/or data logger, but I don't currently have a scope.I'm want to play with various modulations used in radio and communications (e.g., QAM) and try to make my own decoder for them (either in software or FPGA).Currently I'm interested in VDSL2 (~17 MHz bandwidth) and Wi-Fi (20/40/80 MHz bandwidth), so ideally I should be able to continuously log at at least 50 MS/s (better: 100 MS/s) for a few seconds/minutes at once (to capture entire handshakes and such).But at the same time, I do not own an oscilloscope yet, and it feels like an oscilloscope might include this feature, so maybe I would be able to find it integrated with an oscilloscope? Though it then means that the scope will need to be able to sample at 500 MS/s for a useful 50 MHz bandwidth.Or maybe I don't need any of this and can just use a SDR?So TL;DR: Do I get a scope, data logger, or SDR? Or a combination? Any specific model recommendations?I'm willing to spend up to ~USD$1000.If going with the scope route, it seem like the Picoscope 3205D is the only device that satisfies these requirements.It seems like all other scopes at this price point I've looked at are unable to log at 50 MS/s for more than a few hundred milliseconds.
"SX-DMM" seeking old versions of the BK Precision / Metrix software - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 08, 2019, 10:26:27 pm
content: Title says it mostly.I'm working on adding bluetooth to my nice old meters, the original IR interface is unbotainium and I don't feel like wedging one of my poor custom-designs here so BT makes sense to me.I have a MSI U100 netbook with integrated BT that would be handy for testing, it's still running Windows XP and getting slow at that, so I'm not even thinking of upgrading to 7.After getting some chat going on Realterm I wanted to install the official SX-DMM v2.9 software and discovered that I needed Windows 7 for that. Stuck by evolution again...It's nice that the new versions of SX-DMM keep support for these old meters but disappointing that you cant get hold of a version dating back to the day the meters were released.Anyone out there have a copy of a version of SX-DMM (or equivalent from BK Precision) that would run on Windows XP or 98?The DMM's concerned are BK 5360, 5370, 5380, 5390, Metrix MX53, MX54, MX55, MX56 and a few other bench equivalents.Thanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: April 09, 2019, 08:33:03 am
content: Did you ask Chauvin Arnoux ?They were kind enough to send me the cal software for my metrix mx556 aka bk precision 5490.Took 2 days for an response.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 09, 2019, 08:45:47 pm
content: No, I haven't asked Chauvin yet. Will give it a try, there's actually quite a bit I'd like to ask them for when I think of it.
The Angry Pixie is Running! - Page 1
Forum section: electronics / testgear

author: blueskull
author_rank: Unknown
timestamp: April 08, 2019, 11:38:24 pm
content: As the controller's arrival today, I finally was able to power up my pixie (that's how Keysight sales rep pronounces PXI) system.Currently, there are two 1GHz scopes and 3 SMUs in the box. A DMM module and an auto probe interface module are on their way.I got really luck on procuring this system. The chassis was bought as "for parts or not working", and the only problem was a dead fan and some conductive dust accumulation. Oh, it came with TCXO upgrade as well.After dedusting the PCB and replaced the fans, it no longer powers off randomly or complain fan fault anymore.The controller was also a score. It was listed as used, but it turned out its brand new with only 4 hours of uptime and 40 power cycles. It is in the old painting (white, rather than the new red bars on gray), but for 1/4 the MSRP, I can complain nothing.The only thing I have with it is the auto low noise fan, which when enabled, triggers the low RPM protection due to my fan has lower RPM than the original one. Since the cooling is actually very well, I decide to trick the system with an RPM doubler. That'd be a quick and fun project that I can also do a PCB designing tutorial on.

author: gslick
author_rank: Frequent Contributor
timestamp: April 09, 2019, 12:16:48 am
content: M9037A PXIe High Performance Embedded ControllerUS$ 7,328 (x1)M9243A PXIe 1 GHz OscilloscopeUS$ 12,504 (x2)M9111A PXIe High-Speed Source/Measure Unit, 13 V, ± 1 A or 6 V, ± 3 A, 18 WUS$ 5,824 (x3)That's only US$ 49,808 total list price for the plug in modules, if someone bought these new.

author: gslick
author_rank: Frequent Contributor
timestamp: April 09, 2019, 12:59:36 am
content: Quote from: blueskull on April 09, 2019, 12:25:19 amSarcastic use of "only", meaning the exact opposite.

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: April 09, 2019, 05:38:37 am
content: Mooovin and groooovn' back to China. Gotta lighten the load and sell stuff. Buys more stuff..

author: Fludo
author_rank: Regular Contributor
timestamp: April 09, 2019, 12:15:30 pm
content: PXIs are really awesome, but virtual knobs and virtual buttons will never replace the real thing!

author: grifftech
author_rank: Frequent Contributor
timestamp: April 09, 2019, 05:04:31 pm
content: Quote from: gslick on April 09, 2019, 12:59:36 amjust like "a small loan of a milion dolars"
Fluke8840A stuck at value DC - Page 1
Forum section: electronics / testgear

author: gossamer
author_rank: Contributor
timestamp: April 09, 2019, 03:19:23 pm
content: I got a Fluke as used/working item. Self test is passing without any errors. Measuring voltage seems fine, it gives what looks like a reasonable value (can compare it only to handheld MM which shows approximately same value).The problem is when I set meter to Digit6(Auto), Digit2, Digit1 mode on DC voltage measurement, it is showing OK value from the power supply. Changing the value up/down on PSU settles fast on the fluke. Seems to be operational. But, when I unplug the lead it get stuck to that value and it starts to drift toward +Inf. Interestingly enough, Digit3, Digit4 and Digit5 mode get reset to 0 after unplugging the leads.Didnt have a chance to crack it open. Any suggestions how to troubleshoot this issue ?Thanks

author: Kean
author_rank: Unknown
timestamp: April 09, 2019, 03:32:48 pm
content: That sounds completely normal. Selecting those different modes is changing between the various fixed (or auto) voltage ranges.Per the manual, in 200mV, 2V, and 20V ranges, the input impedance is very high - 20Gohm, vs the 10Mohm in 200V & 1kV ranges.With such high impedance, it isn't at all unusual to see this drift.

author: Specmaster
author_rank: Super Contributor
timestamp: April 09, 2019, 03:39:31 pm
content: I agree, its perfectly normal because of its exceptionally high input impedance, I have 2 of these lovely meters. If your in any doubt about it, after disconnecting from voltage source, touch the probe tips together and the display will zero and as soon as you seperate the tips, the display will slowly increase again due to EMF field in the air being picked up by the leads.

author: gossamer
author_rank: Contributor
timestamp: April 09, 2019, 03:50:41 pm
content: Spot on. As said, touching the probes together zeros the input. It starts drifting again after.Makes senseThanks for pointing that. I suppose I should download the manual
Tektronix THS720A power-up problem - Page 1
Forum section: electronics / testgear

author: TekWal
author_rank: Newbie
timestamp: April 08, 2019, 02:06:53 am
content: I need some advice from the forum.Just got a nice THS720A for my daughter project. It is experiencing some weird power up behavior.The scope works fine but occasionally, it will just refused to boot up. Pressing the on/stdby button will just light up the backlight and nothing happened. I need to unplug the AC adapter and then plug in again with the on/stdby button pressed. After that it will works fine. Self-test PASS and there is not error messages on the error log status. Whenever the problem return, I will have to do the AC adapter unplug then plug-in + on/stdby button pressed fix. Just to add, there is no battery in the scope.Anyone experienced this problem?Anyway comments/feedback is much appreciated.Wally
Offline SMPS EMC scan: Why is "common mode only" scan so expensive? - Page 1
Forum section: electronics / testgear

author: ocset
author_rank: Super Contributor
timestamp: April 07, 2019, 03:26:48 pm
content: Hi,We find, when we go to get conducted EMC scans (of <200W offline SMPS’s) done at EMC test places in UK, they want big money to do individual common mode or differential mode conducted scans.So we end up with only having EMC scans which are a mixture of the common mode and diff mode disturbances. (my company can't pay for anything better).We realise that to get a conducted , "common mode only" scan, we need to have the EMC scan done with a splitter in place, and the EMC receiver has to then do Magnitude spectral measurements.However, we also believe that an even easier way to get “common mode only” conducted scans, is to use the EMI receiver to measure live and neutral simultaneously…and then post-process tha scan data. I am certain that our EMC test house does this anyway, because their EMI receiver (network analyser) always does just one scan, but they give us separate live and neutral scans from the one scan…therefore, they must be scanning live and neutral simultaneously………their EMI receiver goes straight into a computer, so I don’t see why they want to charge us so much more for “common mode only” scans?Do you know why “common mode only” scans are so much more expensive?
Gophert CPS-1620 II --- New model? Anyone have one? - Page 1
Forum section: electronics / testgear

author: peterloron
author_rank: Newbie
timestamp: April 05, 2019, 06:19:43 pm
content: Hello. I'm going to be buying a new power supply, and am currently looking hard at the Gophert CPS-1620 and CPS-3220. While trollign ebay, I ran across a listing for a CPS-1620II, which I had not seen listed anywhere else. The Gophert website is AWOL. Does anyone have any information on this one? Legit new version?Thanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: April 05, 2019, 07:18:30 pm
content: The v2 is suposed to be an ameliorated / upgraded version, there`s some teardown on youtube, cant recall who did it, this is the only place i heard / saw that.

author: Jester
author_rank: Frequent Contributor
timestamp: April 05, 2019, 07:18:41 pm
content: I have the 1620 III have not tested in extensively, I did run it up to 20A and then for about 10 hours at 10A, runs barely warm. Some audible 10KHzish noise with low current and burden (silent above about 4-5A). I picked this up for heavier current testing, seems like good value for $. Shipping was quick for China and this company seems to have a pretty good reputation from the quick reviews I found.

author: Emo
author_rank: Regular Contributor
timestamp: April 05, 2019, 08:27:26 pm
content: I still use the CPS-6017. Quit and doesn't run warm. Its decently built and can be modified to 4-wire operationhttps://www.eevblog.com/forum/chat/what-did-you-buy-today-post-your-latest-purchase!/msg1101867/#msg1101867Regards,Eric

author: tautech
author_rank: Super Contributor
timestamp: April 05, 2019, 08:39:17 pm
content: Quote from: peterloron on April 05, 2019, 06:19:43 pmHow much current and how low noise do you require ?The new SPD1068X is a linear PSU with sense terminals, 16V, 8A and ripple down in the uV's.https://www.siglentamerica.com/power-supplies/spd1000x-series-programmable-dc-power-supply/There's a thread on them here with a video and teardown from Defpom.
The Sound Technology 1000A FM alignment generator - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: April 02, 2019, 09:29:59 pm
content: Hi All-Anyone here familiar with this old FM stereo generator? Got a couple questions if you can help:What is option M4?I've scored what seems to be a good manual, but curious to know where 1000A users hang out on the web. Is there a particular forum to discuss this?Many thanks.

author: radhaz
author_rank: Regular Contributor
timestamp: April 03, 2019, 12:51:01 am
content: Maybehttps://groups.yahoo.com/neo/groups/FMtuners/info

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: April 05, 2019, 08:19:37 pm
content: Pretty sure I have the manual (or 2) for mine. I'll try to remember to get the option data for you.They were just down the road in Campbell, CA I also managed to get some of their original equipment they used to design the 1700 Dist. Analyzer from one of their engineers. We used those and 1000s at Pacific Stereo back in the day...
Simpson Model 1701 Ammeter Standard manual/info wanted - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: April 05, 2019, 07:51:58 pm
content: I just purchased a Simpson Model 1701 Ammeter Standard in excellent condition and am looking for any information that I can find about it. The Simpson website indicated you could email them to request a manual or possibly a reproduction of one but, after two different emails, I have still not had a response. I can try calling them, but I wanted to see if anyone here could help out first.Thank you all,Hal
Test and Measurement Equipment Auction - Page 1
Forum section: electronics / testgear

author: stmcore
author_rank: Newbie
timestamp: April 05, 2019, 07:50:01 pm
content: https://www.go-dove.com/en/events?cmd=details&event=561515&query=3f2peU1pkHR29sk2kvaa2Ori0tz2LTL59tjAI-z.9GrhTybp9-m50fCA0sCt2Nka2OrY0yk2kzCA3QmD222V&&page=1&sort_column=event_id,lot_number
Rigol MSO5000 Upgrade to 500M bandwidth - Page 1
Forum section: electronics / testgear

author: souldevelop
author_rank: Regular Contributor
timestamp: April 03, 2019, 01:13:04 pm
content: the 500M bandwidth based on firmware version 00.01.01.02.03, new firmware 00.01.01.04.04 Still don't know how to deal with it, what do you think?

author: luma
author_rank: Regular Contributor
timestamp: April 03, 2019, 01:28:36 pm
content: So uhhh.. how does one do this?

author: Fungus
author_rank: Super Contributor
timestamp: April 03, 2019, 02:21:12 pm
content: Quote from: souldevelop on April 03, 2019, 01:13:04 pmHow to deal?That's easy: Take some measurements, see if it really works!(although you start needing fancy probes once you go much above 300Mhz so maybe it's not worth doing for most people)

author: souldevelop
author_rank: Regular Contributor
timestamp: April 03, 2019, 02:33:06 pm
content: Don't doubt that !! this is true ,Not surface display is real!!

author: Fungus
author_rank: Super Contributor
timestamp: April 03, 2019, 03:02:24 pm
content: Are you sure it isn't an April fool thing?

author: luma
author_rank: Regular Contributor
timestamp: April 03, 2019, 03:45:10 pm
content: 500M is all you got?Jokes aside, my existing pulse generator is too slow to actually measure bandwidth on this thing, so a Leo Bodnar fast rise generator is on it's way

author: souldevelop
author_rank: Regular Contributor
timestamp: April 04, 2019, 12:48:26 pm
content: I can guarantee that this is not the work of April Fool's Day.

author: luma
author_rank: Regular Contributor
timestamp: April 04, 2019, 03:57:44 pm
content: So... is the intent here to release the process to enable this? If not, what is the purpose of this post?
What is the discharge resistance of HP4890L? - Page 1
Forum section: electronics / testgear

author: zhones
author_rank: Newbie
timestamp: April 04, 2019, 04:15:45 am
content: A few seconds after HP4890L was plugged in, the switching power supply exploded and turned on to see that the resistance burned. Teachers, what is the resistance value in the red circle? Thank you so much!http://bbs.elecfans.com/data/attachment/forum/201904/03/142136n9itiyywt6x8bm98.jpg.thumb.jpghttp://bbs.elecfans.com/data/attachment/forum/201904/03/142137oojx34j33o9o333x.jpg.thumb.jpghttp://bbs.elecfans.com/data/attachment/forum/201904/03/142138j666e4qmkh4qz6sq.jpg.thumb.jpg
Fluke 423A 3KV Supply info - Page 1
Forum section: electronics / testgear

author: Famine
author_rank: Newbie
timestamp: April 04, 2019, 04:01:44 am
content: I managed to score an awesome deal on a Fluke 423A, but I am having a little trouble finding any documentation for it.If anyone has some more info or a manual for this unit, it would be much appreciated.Thanks,Famine
VISA Programmable GPIO Box - Page 1
Forum section: electronics / testgear

author: dubnation
author_rank: Newbie
timestamp: April 03, 2019, 05:12:36 am
content: Hey folks,Doing some validation of new ICs, and I am looking for a way to toggle/sequence digital outputs (both push-pull and open-drain) with adjustable I/O voltage level, timing resolution in the ~1us range and 10+ outputs.Until now I have been using various micros and level shifting as necessary - but it is a bit of an inconvenience and lots of wiring. Does anyone know of something that exists, preferably addressable via VISA, besides the overpriced National Instruments solutions? Essentially looking for the 'Saleae' equivalent for digital outputs. Even better if it can accept python scripts with external trigger.

author: Tony_G
author_rank: Super Contributor
timestamp: April 03, 2019, 05:25:11 am
content: Maybe an ebay HP 34970A and a 34907A card(s)?TonyG

author: dubnation
author_rank: Newbie
timestamp: April 03, 2019, 05:36:28 am
content: Interesting, a bit bulkier than I would like. Although the 34907A looks to be open-drain only for outputs.

author: pelule
author_rank: Frequent Contributor
timestamp: April 03, 2019, 07:43:30 pm
content: I use U2121A / 16-Terminal Digital Input and 16-Terminal Digital Output for similar application.https://de.rs-online.com/web/p/messdatenerfassung/6862021//pelule
Benning CM11 - Page 1
Forum section: electronics / testgear

author: testian
author_rank: Regular Contributor
timestamp: April 03, 2019, 06:20:51 pm
content: Just some Impressions from the Benning CM11 Clamp Meter.It feels not as solid and high quality as i hoped, but it is one of only a few meters which can measure mA without disconnecting the circuit. The meter is power by two AAA batteries supposed to last 30 - 100 hours. Depending on usage mode and backlight.Although it is not the smallest device,the holster is still a bit too large.The Measurement leads are average, but i trust them their rating. Overall length is 140cm. AWG 18I can't comment on the input protection. The only thing i can say that there is some build in.For the measurements there is nothing to complain, except the slow continuity test.But the measurement for 0-200mA signals is quite reliable. The value does not drift much and opening/closing the clamp has only a low impact. It seems to use some active technology, because it makes a slight humming sound when in DC ampere mode.Specs:DC current range:Measuring rangeResolutionMeasurement accuracyOverload protection300.0 mA0.1 mA± (1.0 % of reading + 10 digits)100 A AC/DC0.300 A - 3.000 A1 mA± (1.0 % of reading + 10 digits)100 A AC/DC3.00 A - 10.00 A10 mA± (3.0 % of reading + 10 digits)100 A AC/DCAC current range:Measuring rangeResolutionMeasurement accuracyOverload protection300.0 mA0.1 mA± (1.0 % of reading + 5 digits)100 A AC/DC0.300 A - 3.000 A1 mA± (1.0 % of reading + 5 digits)100 A AC/DC3.00 A - 10.00 A10 mA± (3.0 % of reading + 5 digits)100 A AC/DCDC voltage range (The input resistance is ≥ 2 MΩ.):Measuring rangeResolutionMeasurement accuracyOverload protection60.00 V0.01 V± (1 % of reading + 2 digits)660 V AC/DC60.0 V - 600.0 V0.1 V± (1 % of reading + 2 digits)660 V AC/DCAC voltage range:Measuring rangeResolutionMeasurement accuracyOverload protection60.00 V0.01 V± (1.2% of reading + 5 digits)660 V AC/DC60.0 V - 600.0 V0.1 V± (1.2 % of reading + 5 digits)660 V AC/DCRating: 1000 V CAT III, 600 V CAT IV
Micro ampere meter module with UART/I2C/SPI interface to built-in - any? - Page 1
Forum section: electronics / testgear

author: OleMi
author_rank: Contributor
timestamp: April 02, 2019, 09:26:57 pm
content: I have to design a test board for automatic testing other boards for power consumption, which should stay within 5-6uA. I don't want connect any external multimeters, neither create such module myself. I also don't want a test person to read values from display and analyze them. I want that some microampere module (that I will locate on my test board) will test consumption and report MCU on my test board if this is outside of configured thresholds. The market is full of cheap modules with display, but that's not what I need. I need an interface for communication with MCU on my board or at least logical 0/1 once consumption reaches a threshold configured on the module itself. I was not able to find a suitable module on the market for my task, maybe someone did better research previously?

author: Fungus
author_rank: Super Contributor
timestamp: April 02, 2019, 09:54:09 pm
content: I imagine a voltmeter is easier to find and thanks to Ohms law you can put in a suitable known resistance, measure the voltage drop across it, and, bingo! Amps.

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 02, 2019, 10:10:27 pm
content: Ditto what Fungus said.5 to 6 uA across a 10k shunt resistor would generate 50 to 60 mV, which could then be amplified 10X before feeding to your A/D.

author: pigrew
author_rank: Frequent Contributor
timestamp: April 02, 2019, 11:24:30 pm
content: We may need a few more details... What voltage are you measuring? What bandwidth do you need? Are you looking for peak or average current?One main choice to make is low or high side sensing. If high voltage, you may need some sort of isolation of your digital signals.I just played with a TI MSP430 eval board with energytrace on it. It probably is USB-only, but gives really good resolution (using its 3.3V source).Another strategy would be to charge a capacitor, and use it to power your circuit, watching the voltage as it discharges

author: pigrew
author_rank: Frequent Contributor
timestamp: April 02, 2019, 11:56:53 pm
content: I just did a bit of web searching... Would the MAX9611 work?

author: OleMi
author_rank: Contributor
timestamp: April 03, 2019, 06:41:06 pm
content: Guys thanks I will think over your answers.Voltage is 3.3v, average current.

author: oPossum
author_rank: Super Contributor
timestamp: April 03, 2019, 09:19:07 pm
content: INA219http://www.ti.com/lit/ds/symlink/ina219.pdfhttps://www.adafruit.com/product/904https://www.sparkfun.com/products/15176You will have to change the shunt resistor on those modules.
Leakage current measurement with Keithely 237 high voltage SMU - Page 1
Forum section: electronics / testgear

author: balage
author_rank: Regular Contributor
timestamp: April 03, 2019, 12:38:14 pm
content: Hi Guys,I have bought a Keithley 237 high voltage source measure unit. I haven't got massive experience in the world of low level measurements. But everybody started somewhere.So I would like to ask you opinion on my first measurements. I am measuring the leakage current of a high voltage 4,7 nF MLCC (https://hu.mouser.com/datasheet/2/212/KEM_C1051_GOLDMAX_Z5U-1140498.pdf). I have simply connected the two terminals of the cap to the FORCE HI and the Groung banana on the SMU. I have set a source voltage of 1000 Volts.At the begining I can measure around 8-10 nA and this value settled down to 2 nA slowly. It is expected based on what is the written in Keithley's Low Level Measurements Handbook. You can see the copied image below. So the average looks good for me. The thing I cannot understand is that the momentary measured value is always changing, e.g. between 1,99 - 2,24 nA. The resulted resistance is 502 GOhm to 446 GOhm at this point.It is clear that a proper measurement chamber should be used to isolate the environment. One is under construction. I am using the experience shared here:https://www.eevblog.com/forum/metrology/my-triax-cable-shielded-box-project-for-keithley-instruments/Generally my question is that this variation in the momentary measured values is expected? Why can I see this?How do you think the AC current caused by the ripple of source voltage affects the leakage resistance measurement? I assume the source voltage has ripple. I will measure it.Cheers,