hybridfree/eevblog-posts huggingface dataset:
Fluke 8050A  - Page 1
Forum section: electronics / testgear

author: alin_im
author_rank: Regular Contributor
timestamp: April 16, 2015, 02:42:27 pm
content: Hey guys,What do you think about a Fluke 8050A for a newbieI will use it for general low power applications (less then 35 - 40 v , less then 2 amps)

author: smjcuk
author_rank: Frequent Contributor
timestamp: April 16, 2015, 03:03:43 pm
content: They're very nice meters. LCD displays tend to totally pack in or go dark though so be careful.

author: codeboy2k
author_rank: Super Contributor
timestamp: April 16, 2015, 04:33:14 pm
content: This person did a nice job on his 8050A LED conversion. I really like this lookhttp://mrmodemhead.com/blog/gallery/fluke-8050a-led-conversion/another guy did a hi-res bitmapped graphic displayhttps://sites.google.com/site/kenselectronicsprojects/fluke8050a_displaySo if you can get them dirt cheap they might make a fun hobby project.

author: smjcuk
author_rank: Frequent Contributor
timestamp: April 16, 2015, 06:30:20 pm
content: Ooh didn't think of that. I'll snag one next time one appears on eBay. Cool project idea. Thanks.

author: wiss
author_rank: Frequent Contributor
timestamp: April 16, 2015, 06:35:29 pm
content: My first bench dmm, I love them!
new sub-$500 entry-level thermal camera from Xintest, 60 × 60 pixels - Page 1
Forum section: electronics / testgear

author: ixfd64
author_rank: Frequent Contributor
timestamp: April 16, 2015, 04:17:23 am
content: Thisseems to be a pretty new thermal camera. It has a 60 × 60 resolution for less than $500. Anyone know if it's any good?
Pragmatic 9001 DC Voltage Reference - Page 1
Forum section: electronics / testgear

author: gilbenl
author_rank: Regular Contributor
timestamp: April 15, 2015, 03:56:20 am
content: Pragmaticadj.-Dealing with things sensibly and realistically in a way that is based on practical rather than theoretical considerations.Got this because I wanted to know what kind of voltage reference a company with the name "Pragmatic" would make. Half the board was under a metal block and figured it was an oven. Nope-REF101, which doesn't have a heater, and an OP27. Does it strike anyone else that a lot of wasted effort went into not much reference?

author: Vgkid
author_rank: Super Contributor
timestamp: April 15, 2015, 04:14:54 am
content: Now ovenize it.

author: barnacle2k
author_rank: Regular Contributor
timestamp: April 15, 2015, 05:20:26 am
content: wow, i had that thing on my watchlist considering it.Yes i too expected more from that thing.hindsight - always 20/20

author: codeboy2k
author_rank: Super Contributor
timestamp: April 15, 2015, 06:17:33 am
content: Yep, not much there except a buffered 10V reference chip.They did a lot to try to shield it well, and give the separate circuit areas their own ground returns. That's good.I'm a bit surprised to see an LT317 there. A much lower-noise regulator can be made from better parts. That said, they didn't even try to reduce the noise on the LM317 as they used it. The simple addition of a 10u bypass cap at the bottom resistor of the divider (R6 in the photos) can dramatically reduce the output noise.It's interesting how they jumpered the ground connections into the shielded area. The shield is pulled back and raised jumpers are used. What's the point of the raised jumpers like that; they don't jumper over anything.what could have been done instead?(1) at least an LM399 (which needs an opamp to multiply it up, but they already have one there now)(1a) -- add a TC matched pair of divider resistors for the opamp gain(2) lower noise, more precise voltage regulator(3) shielded cable to bring the + and - ports out to the front, since they went to the trouble to guard it like they did, then left open wires flappin' in the breeze to pick up noise.(4) oven ? maybe if they stick with the REF102, yes.

author: gilbenl
author_rank: Regular Contributor
timestamp: April 15, 2015, 12:46:57 pm
content: Quote from: codeboy2k on April 15, 2015, 06:17:33 amAbove is why I find the company name "Pragmatic" so comically fitting. You have some great suggestions. I only paid a bit for the thing so I think it may be a good candidate for some hacking. I don't think the REF101 and REF102 have remotely similar pins, but that may be fixable...I'll try to post a schematic if anyones interested.
Cheap DDS boards - any good ones? - Page 1
Forum section: electronics / testgear

author: smjcuk
author_rank: Frequent Contributor
timestamp: April 15, 2015, 06:39:05 am
content: Are there any half respectable ones out there? Need something that will kick out a clean sine wave across the 100KHz-5MHz range. I've been bodging one off oscillators for a few months which is somewhat tedious. Don't really care if there is an output stage; I can build oneI've noticed a couple of designs ranging from a resistor ladder DAC off an AVR to an AD DDS IC so it looks like a minefield hence the request.

author: tggzzz
author_rank: Super Contributor
timestamp: April 15, 2015, 09:18:35 am
content: Consider something likehttp://www.ebay.co.uk/itm/1x-DDS-Function-Signal-Generator-AD9851-0-50MHz-DDS-signal-source-DDS-Module-/151254816780It is essentially intended as a means of generating an accurate square wave clock, but which also gives a sine output 1Hz->50MHz.The design is straight from the AD data sheet, and is essentially: 180MHz DDS clock, DAC -> 70MHz 7th Order LPF, and the LPF -> 50ohm outputandcomparator input. The comparator only works to ~5MHz. I found the comparator introduced glitches, so I disconnected the comparator's input from the LPF output.I have no idea whether that would consititute a "clean" sine wave for your purposes.

author: smjcuk
author_rank: Frequent Contributor
timestamp: April 15, 2015, 09:41:22 am
content: Thanks - that looks like what I need. Plus it's only £25 so not the end of the world if it's a turdClean as in frequency stable, reasonable SNR, relatively low THD and preferably not too much EM noise although I can sort that with suitable shielding.Seriously considering a Rigol with FFT now. 45 year old Tek isn't cutting it for this idea I had

author: atferrari
author_rank: Frequent Contributor
timestamp: April 15, 2015, 09:46:24 am
content: Just in case, google about a batch produced in China, not even sure if with that chip, which had an error in the components implementing the eliptic filter at the output. Maybe they are all sold already.

author: Marco
author_rank: Super Contributor
timestamp: April 15, 2015, 09:57:34 am
content: If you want to move up the frequency scale there's somedecently priced AD9910 boardswith GUI out there too now, but I have no idea about the quality and translation of the manual/GUI.

author: smjcuk
author_rank: Frequent Contributor
timestamp: April 15, 2015, 10:04:36 am
content: Quote from: atferrari on April 15, 2015, 09:46:24 amHa I seeeee.I might give that a miss then. Last thing I want to do is debug something new.

author: smjcuk
author_rank: Frequent Contributor
timestamp: April 15, 2015, 10:10:48 am
content: Have applied to the purchasing department (wife) for a new TTI generator...
Help identify this device. - Page 1
Forum section: electronics / testgear

author: Pasky
author_rank: Regular Contributor
timestamp: April 13, 2015, 03:43:09 am
content: This is the best I could do using my magnifier and camera.It appears to read:8GM3052 or 8GM 3G52 or BGM 3052/3G52XMS1415CI believe it's an Op Amp but cannot find any datasheet given the print on the chip. Thanks for any help.

author: Pasky
author_rank: Regular Contributor
timestamp: April 13, 2015, 03:52:08 am
content: Also my apologies, wrong section. I wanted this in the projects and designs sub forum

author: Pasky
author_rank: Regular Contributor
timestamp: April 14, 2015, 05:50:31 pm
content: Still trying to find this, and if a moderator would please move this to the appropriate sub forum

author: Muxr
author_rank: Super Contributor
timestamp: April 14, 2015, 06:21:37 pm
content: You will get less noise on your camera if you can get some more light on the subject.

author: coflynn
author_rank: Regular Contributor
timestamp: April 14, 2015, 10:39:30 pm
content: I think SGM8052, thedatasheetspecs in the MSOP8 package the marking being "SGM8052XMS" which aligns with most of the markings you've got, and falls in line with the op-amp assumption.

author: Pasky
author_rank: Regular Contributor
timestamp: April 15, 2015, 04:26:36 am
content: Quote from: coflynn on April 14, 2015, 10:39:30 pmExcellent. Thank you sir.
Tektronix 7854 400MHz oscilloscope - Page 1
Forum section: electronics / testgear

author: drakke
author_rank: Regular Contributor
timestamp: April 13, 2015, 12:43:28 am
content: Hello,I have a DS1074z and wondered if getting an analog scope would be worthwhile. Everything on ebay is too expensive and shipping is a fortune but there is a Tek 7854 (with waveform calculator keyboard) 400MHz oscilloscope offered locally which seems reasonable if it works.It is a mainframe and I wonder if this is ok for a beginner.http://w140.com/tekwiki/wiki/7854http://www.barrytech.com/tektronix/tek7000/tek7854.htmlIt comes with the following plugins:http://w140.com/tekwiki/wiki/7B92500 MHz dual timebase plug-inhttp://w140.com/tekwiki/wiki/7A26200 MHz dual-trace vertical plug-inhttp://w140.com/tekwiki/wiki/7B53100 MHz dual time base plug-inhttp://w140.com/tekwiki/wiki/7B85400 MHz delaying timebase plug-inhttp://w140.com/tekwiki/wiki/7A18general-purpose 75 MHz dual-trace vertical plug-inhttp://w140.com/tekwiki/wiki/7A19one-channel 600 MHz vertical amplifier plug-inIs there anything that would make it unrepairable?What should I watch out for?Thanks.

author: FrankenPC
author_rank: Unknown
timestamp: April 13, 2015, 03:21:16 am
content: The incredibly complex multi-function switches tend to go bad and need to be manually cleaned/replaced. I've owned many Tektronix 7000 series mainframes and loved them. But I would not recommend buying one unless you are doing it as a hobby. They are VERY old at this point.

author: Rupunzell
author_rank: Frequent Contributor
timestamp: April 14, 2015, 03:31:19 am
content: Tek 7854, not recommended for anyone new to Tek 7000. These are complex and not easy to service with lots of speciality devices. It does offer measurement features found in many DSO's today as it is part analog, part digital. There is not a 7B87 listed which is the speciality time base designed for the 7854 and the keyboard calculator appears to be missing.Of the Tek 7000 main frames, my faves are 7904A (500Mhz) and 7104 (1Ghz). The 7904A is one of the most versatile, reliable daily user 4 bay main frames made by Tek. These main frames should be properly configured with the correct set of basic plug ins to achieve intended performance.As for age, overall condition and how a specific Tek 7000 system has been cared for matters more than age. Know these Tek instruments are built to last, be repaired as required and not be obsolete for the next model in a marketing effort to move merchandise. Very different design, production and user value system than most of the stuff designed and built today.Bernice
Keysight instrument phorno..... - Page 1
Forum section: electronics / testgear

author: vaualbus
author_rank: Frequent Contributor
timestamp: April 13, 2015, 09:12:16 pm
content: Today I have partecipate at a really interest conference from keysight at my university about EMI and hisgh speed signals.I have really look at very high end gear. Here some photo. The interest think is that everything cost at least more than 1k of $!Here a link to the flickr album:https://www.flickr.com/photos/98233775@N05/sets/72157651486120807/Later I'm going to write the photo description. Sorry for the low quality but my S4 decide to do this orrible photos.Have fun.Best regards, Alberto
Peak Electronic Atlas ZEN - Page 1
Forum section: electronics / testgear

author: gmit77
author_rank: Regular Contributor
timestamp: April 13, 2015, 01:45:34 pm
content: Hello, Peak Electronic has just released the new Atlas ZEN which is great for testing Zeners (up to 50V), VDRs, TVSs, LEDs (and LED strings up to 50V) and more.http://www.batterfly.com/shop/peakelec-zen50as low as Euro 43 + VATcheers

author: dadler
author_rank: Unknown
timestamp: April 13, 2015, 08:00:55 pm
content: Link to manufacturer data page:http://www.peakelec.co.uk/acatalog/zen50-zener-analyser.htmlLooks like a useful product, and cheaper than most of the other Peak products.I have the DCA Pro and it can't really identify Zeners beyond 11v. I bet 'mikeselectricstuff' gets one soon for all of his LED setups!

author: dadler
author_rank: Unknown
timestamp: April 15, 2015, 12:35:34 am
content: Well I couldn't resist and ordered one of these.Here is a review by Scullcom:https://youtu.be/hiVCa5YvKuM

author: TerminalJack505
author_rank: Super Contributor
timestamp: April 15, 2015, 01:31:58 am
content: What I find interesting is that it doesn't have a 20mA test current setting. It maxes out at 15mA. A lot of the lower voltage Zeners are spec'ed with a 20mA test current.Here's a circuit that I've been playing around with in the simulator. A completely discrete Zener tester (for use with two DMMs) that should have a 0 to 75V range and 0 to 30mA test current.
New Handheld Spectrum Analyzer from TTi 3.6 and 6 GHz - Page 1
Forum section: electronics / testgear

author: Mr Simpleton
author_rank: Unknown
timestamp: June 16, 2014, 12:46:32 pm
content: Just saw in the news that TTI has two new handheld spectrum analyzers, up to 3.6 and 6.0 GHz. At first glance they do look neat but somehow I get this nagging feeling it is not just all singing and dancing. I cannot find any numbers on sweep time, other than that it is related to RBW and VBW and that there is an "speed-up function". If they do not tell numbers it sure will be badAnd they start at 10 MHz, which is no good in my book.http://aimtti.com/products-tti/pdf-brochure/rf-psa_s5-9p.pdfPrevious versions did not impress me either, and the TTi analyzer I still have is a very basic analogue 250 MHz unit which uses an analogue oscilloscope for display. Nice price back in the late 80's but totally obsolete now

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 12, 2015, 07:41:02 pm
content: I have seen that little gadget.https://plus.google.com/photos/106264218831814439783/albums/6131371625027708033/6131373895835574946?sort=1&pid=6131373895835574946&oid=106264218831814439783https://plus.google.com/photos/106264218831814439783/albums/6131371625027708033/6131373915876115618?sort=1&pid=6131373915876115618&oid=106264218831814439783

author: Solder_Junkie
author_rank: Frequent Contributor
timestamp: April 13, 2015, 06:26:50 am
content: I have had a PSA1302 (1,3 GHz) for some time and while the bandwidth isn't narrow enough for SSB IMD measurement, it's superb for tracing EMC issues. HP even used them for preliminary EMC checking as being hand held and relatively cheap, they are ideal at sniffing out sources of spurious signals.Sweep speeds are not an issue. They are professional instruments and work very well.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: April 13, 2015, 11:47:28 am
content: Quote from: Solder_Junkie on April 13, 2015, 06:26:50 amI'd guess these are Vector SAs and thus don't really 'sweep' anyways.Edit: based on theproduct brochurethese things are indeed swept SAs.
Where to buy BK Precision Products in Australia? - Page 1
Forum section: electronics / testgear

author: tec5c
author_rank: Frequent Contributor
timestamp: April 13, 2015, 07:34:59 am
content: As the title says, I can't really find anywhere that sells BK Precision products in Australia. Sure I can order online but if they're outside of the country then I am hit with import tax, sure it's not much but I would rather avoid it if I can.I am looking to buy the 8500 DC electronic load.Any help would be great.Thanks.

author: andtfoot
author_rank: Unknown
timestamp: April 13, 2015, 09:16:29 am
content: Looking at the BK Precision website, it appears to be Unispan Instruments:http://www.unispan.com.au/BK%20Precision/Electronic%20Loads.htm

author: tec5c
author_rank: Frequent Contributor
timestamp: April 13, 2015, 11:27:19 am
content: Thanks andtfoot.I did see them on the website but my mind must have been elsewhere as I wrote them off as being an overseas company!I'll give them a call tomorrow to confirm and hopefully place an order
Help me about this multimeter ? - Page 1
Forum section: electronics / testgear

author: Nhan95
author_rank: Contributor
timestamp: April 12, 2015, 08:18:43 am
content: I'm going to buy this multimeter, I'm in Vietnam and I have found a prestigious store to buy. Can you help me see this DMM and give me some idea about it ? Is it good, accuracy, protection, safety... Thanks very muchhttp://emin.vn/en/Digital-Multimeters-Kyoritsu-1011--K1011-111p10sl2.html

author: Nhan95
author_rank: Contributor
timestamp: April 12, 2015, 08:46:01 am
content: I'm a student of university,major of electronics, second year, so I want to save my money to buy a good multimeter to use long.

author: Nhan95
author_rank: Contributor
timestamp: April 12, 2015, 08:54:56 am
content: DC stuff <100V, and AC somtimes

author: Nhan95
author_rank: Contributor
timestamp: April 12, 2015, 10:03:23 am
content: Yes, some people also advice me to use UNI-T UT139, but it rather rare in Vietnam. So I think of kyoritsu, 55$ is not include VAT 10%, but it still much cheaper than in China anyway.

author: Nhan95
author_rank: Contributor
timestamp: April 12, 2015, 10:20:10 am
content: Maybe 10% VAT and ship fee. But I think I choose kyoritsu for starter. In the future, If neccessay, I'll buy a true RMS multimeter like Fluke or keysiht agilent

author: cs.dk
author_rank: Unknown
timestamp: April 12, 2015, 10:38:06 am
content: Get a True RMS from start. Like the Brymen 257 - It is IMO very good value for money.

author: Lightages
author_rank: Unknown
timestamp: April 12, 2015, 04:51:57 pm
content: This is the second thread started by Nhan95 asking for advice about the same meter.https://www.eevblog.com/forum/testgear/multimeter-for-starter/If he/she wants that meter so much then he/she should just buy it. All of the time by others to help is obviously not really wanted.

author: dadler
author_rank: Unknown
timestamp: April 12, 2015, 05:57:07 pm
content: Yeah I was going to offer suggestions, but I get the feeling we will keep seeing new threads until we tell him this meter is good.My advice: "Get it, this meter is good."
Suggest a bench meter? (34410A vs 34465A vs Keithley) - Page 1
Forum section: electronics / testgear

author: uoficowboy
author_rank: Regular Contributor
timestamp: April 12, 2015, 12:45:32 am
content: Hi - I'm looking to get a new bench meter. My first instinct is to get a 34410A (~$1400) as I've used them in the past and really liked them. I do not have specific specs - just need a meter for general purpose mostly low voltage electronics development.What I like in the 34410A is the general ease of use and the USB logging (10K samples/second is mighty useful!)The 34465A seems to have very similar measurement specs (better than the 34410A in some ways, worse in others), but has added a 10A current range, DC ratio measurement (which seems to be a comparison of the sense to the non sense voltages), temperature measurement, and a much larger screen.Alternatively - I could get whatever is the Keithley equivalent. I am not very familiar with their offerings so I'm less inclined to do that.How is software support for any of these? For the 34410A I never had a good program for logging - what I had was very ghetto (not designed by Agilent). Maybe there are better things out there now? It's been a few years since I looked into it.Any suggestions?

author: nctnico
author_rank: Super Contributor
timestamp: April 12, 2015, 01:01:38 am
content: I'd choose the 34465A over the 34410A any day.

author: HighVoltage
author_rank: Super Contributor
timestamp: April 12, 2015, 01:09:12 am
content: I have used the 34410A for several years and liked it a lot. But since I have the 34461A and the 34470A, I almost do not use the 34410A anymore. So, I would recommend the 34465A for you.The Keysight software "BenchVue" will work with the 34410A and the 34465A for Datalogging over GPIB or LANAlthough the GPIB is optional for the 34465A, it is really fast and easy to use.That said, I do not have any DMM experience with Keithley.

author: Fsck
author_rank: Super Contributor
timestamp: April 12, 2015, 07:06:16 pm
content: Quote from: nctnico on April 12, 2015, 01:01:38 amthe GUI improvement is like night and day.
Modern bench meter with scanner capabilities and functional front interface???? - Page 1
Forum section: electronics / testgear

author: Smokey
author_rank: Super Contributor
timestamp: April 09, 2015, 03:01:50 am
content: I'm looking for a 6 1/2 digit bench meter for general purpose front panel type use, but also has multi-channel isolated data acquisition scanner capabilities from add on cards. I want to automate some testing but still have the equipment easily useable in between tests.Something like the Keithley 2700 series is pretty close if only it didn't have the look and feel of something from the 90s. The single VFD is really limited compared to these new bench meters with super nice interfaces like Keysight 3446X or the Keithley DMM7510 (which I know is new and 7.5 digits, but it has to be the way Keithley is going for future models). Even the Fluke 8845, Tektronix DMM4040, Rigol DM3068 type interface is substantially better than a single VFD. Not having a general purpose bench meter front panel interface mostly disqualifies pure ATE type meters/scanner/mainframes like the Agilent 34972, which it nice but a pain to do anything with manually.Am I missing a meter that has both a general use modern front panel interface and multichannel acquisition scanner capabilities? Is this just a weird time where the old generation of stuff with scanners hasn't been refreshed yet with new interfaces? Should I just skip the integrated meter/scanner and get a nice general use meter and separate scanner? I'm going to need to kit out 4 identical stations and it would be nice if the meter had a long expected life and wouldn't be discontinued tomorrow.Thoughts?

author: TiN
author_rank: Super Contributor
timestamp: April 09, 2015, 04:14:17 am
content: I use 34970A daily (as bench meter, with just one channel monitored, and as system scan to capture datalogs), it's not hard to use after getting little time to get used to.Probably cheapest to go with separate bench DMM and scanner box. Scanners like K7001 are cheap enough, if not use some specialized low-current/hi-resistance cards.Also scanner will also let you run custom armature around , in case you need that in future, like output digital signals to switch relays, loads, external machinery , etc.Keithley have scan cards for 2001 (which is from 90s, but have nice VFD) , but they are rather limited usually, and more expensive (10 channels only, no current).

author: Performa01
author_rank: Super Contributor
timestamp: April 10, 2015, 10:53:36 am
content: If you can live without input connectors on the front, this might be a good option:http://www.rigolna.com/products/data-acquisition/
Rigol DS1054Z Error? - Page 1
Forum section: electronics / testgear

author: alsetalokin4017
author_rank: Super Contributor
timestamp: April 10, 2015, 08:18:03 pm
content: Hello new friends! I've been reading the forum for a while and I obtained a DS1054Z scope based on what I've read here and Dave's videos. It's a great unit, BUT...I think I've found a minor software bug.Doing a power calculation, CH1 x CH2. Setting the "unit" of CH1 to A (amps) and the "unit" of CH2 to V (volts) and the Math operation to CH1xCH2, the thing automagically knows that the results should be in Watts and tells you the vertical scale and offset correctly in Watts. But then when Measurement Source is set to Math, to make the measurements menu on the left side screen use the Math trace... the units come up in whatever you have selected for CH1, NOT the correct "Watts". See the scopeshot below. This also happens to the "All Measurements" table, when Math is selected as the source. It gives the vertical units in whatever you have set for CH1, not the correct "W" but in my case "A".See the screenshot below. So, it's a minor annoyance but maybe it should be confirmed by the "big guns" here... Dave, what do you think? Can you get Rigol to put this problem (if confirmed) on the list for the next firmware revision?Firmware 00.04.02.SP4Board 0.1.1unlocked without difficulty using key from Linux command-line keygen in the Riglol zipfile

author: tautech
author_rank: Super Contributor
timestamp: April 10, 2015, 08:33:59 pm
content: To use the Amps unit of measurement, you'd need to be measuring across a shunt or using a current probe, are you ?This is a Power analysis type measurement and timing Skew between inputs must also be "nulled" for accurate measurement.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: April 10, 2015, 08:43:30 pm
content: Quote from: tautech on April 10, 2015, 08:33:59 pmYes, thank you, I am measuring the Vdrop across a 1 ohm CVR, with the same probe type as I am using for the V measurement, so there should be no skew issue. I'm new to the forum, but not new to electronics or oscilloscopes!But that's not the issue here though! I am talking about the scope not correctly passing the "W" parameter _name_ to the Measurements! Even though it correctly changes the vertical scale and offset of the Math trace automatically to Watts when it is being fed "Amps" and "Volts" _names_ for the units in an AxB computation!The scope only knows what I tell it. If I tell it that one channel is measuring Amps and the other one is measuring Volts, then the result of the AxB math should be in Watts, and it is, except in the locations I have noted: the Measurements, whether from the menu on the left side of the screen (source set to MATH of course) or in the "All Measurements" table. What I am _actually_ feeding to the channels makes no difference, the scope has to take my word for it.ETA: Here's the "All Measurements" table, showing units "A" where it should be showing "W" :
HP8751A network analyzer schematic needed - Page 1
Forum section: electronics / testgear

author: mrf245
author_rank: Regular Contributor
timestamp: March 21, 2015, 05:01:56 am
content: Hi,I have HP8751A with some issue with power module and need to fix it,and I found operation and calibration manual from HP website,but no schematic and description for that.I don't know if anyone have it and may share to me,I'll really appreciate you,thanks.

author: acbern
author_rank: Frequent Contributor
timestamp: March 21, 2015, 08:03:29 am
content: I think the PSU is the same as in the 8720A/B/C VNAs. These are available. Download and check against the different versions.If that turns out to be correct, keep us posted please about the version (not even sure there are much/any differences, its been a while since I repaired mine).

author: mrf245
author_rank: Regular Contributor
timestamp: March 22, 2015, 02:34:06 pm
content: Quote from: acbern on March 21, 2015, 08:03:29 amthank you ,I have checked HP8720 series from HP(keysight) website,there is service manual for 8720A/B/C,but this manual no refer to any component table or schematic for any section of machine.Now when my 8751A turn on,it comes a error message "A and B channel overload".Before that it had burned something so not turn on,my friend replaced a "fuse resistor" in PSU,it turned on and worked OK,but when he used screw to "lock" PSU back to machine,it came out error,no idea to recover.I consider it should be PSU problem.

author: mrf245
author_rank: Regular Contributor
timestamp: April 10, 2015, 08:32:14 am
content: I just success repaired my 8751A and it worked fine now.I have checked main PSU,this model and schematic extremely similar to HP8753A/B module but 8751 with one more output line.It's no problem.Next I found post reg(08751-66540),most of output LED flashed once after power-on but no continuous output,I considered some protect signal cause it.I checked this PCB carefully and compare it with HP8753A/B schematic post reg,found they have some common design method,but some are really different.So I tried to find which signal cause protection.I finally found one of them come out from FAN behind mechine, yellow line,if this line rise up to 5V,it means FAN no working.This time FAN really no working.I checked along with FAN power line,and found a fuse resister(1A) on post reg board was burned.I used a fuse to replace it,repower-on,and it worked fine and made very sharp test.I really appreciated keysight library Le,he helped me find 8751 service manual on library bookbox,even if no scanfiles.I hope this repair can help people who need help like this.
linux-gpib / python question on the HP 3457a - Page 1
Forum section: electronics / testgear

author: CaptnYellowShirt
author_rank: Frequent Contributor
timestamp: May 03, 2014, 10:46:05 pm
content: So I'm trying to read data out of a HP 3457a in its native format over a GPIB bus.I'm using linux-gpib and python to do the work.I have a 1Ohm resistor hooked up to it to perform this testing, but I am getting strange results:QuoteThe ASCII data is pretty much what you'd expect.... showing 0.99775 ohms.But the SREAL (the DMM's internal format) gives this binary stream. The manual says this format should conform to IEEE 754 (e.g. 'float'). So I'm expecting 4 bytes, which to me would mean: [?] [\x7f] [\x80] [\xdc]Using python's struct.unpack() function gives "-2.8934964462904934e+17" for this string:QuoteWhat am I missing here?

author: c4757p
author_rank: Super Contributor
timestamp: May 03, 2014, 10:49:52 pm
content: Flip the bytes around.Code:>>> struct.unpack('f', '\xdc\x80\x7f?')(0.9980599880218506,)More correctly, set it big-endian:Code:>>> struct.unpack('>f', '?\x7f\x80\xdc')(0.9980599880218506,)

author: CaptnYellowShirt
author_rank: Frequent Contributor
timestamp: May 03, 2014, 10:56:26 pm
content: Motorola, trick me once... shame on you.Trick me... 70 or more times... shame on me.Thanks!

author: MikeDombo
author_rank: Unknown
timestamp: April 09, 2015, 09:43:58 pm
content: I know this thread is quite old, but I'd love to see your python code.I'm also writing a python app for reading data from a HP 3457a, which is at githubhttps://github.com/md100play/HP3457A-GPIB
Datron 1061 no Calibration Constants Trying to Repair - Page 1
Forum section: electronics / testgear

author: martinator
author_rank: Contributor
timestamp: January 03, 2015, 01:00:08 pm
content: Fixed

author: soldersplash
author_rank: Newbie
timestamp: April 13, 2015, 03:06:30 pm
content: It's a shame the OP didn't feel like sharing the details
keithley 2001 schematic - Page 1
Forum section: electronics / testgear

author: analogNewbie
author_rank: Regular Contributor
timestamp: April 07, 2015, 04:10:05 pm
content: http://keithley.reprocenter.com/2001-M-R-950-01/pdfs/2001-902-06.pdfhttp://keithley.reprocenter.com/2001-M-R-950-01/pdfs/2001-902-07.pdfjust found it with Google.

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: April 07, 2015, 05:18:43 pm
content: Sweet!TiN has done an outstanding job, but hopefully these can fill in any blanks.http://keithley.reprocenter.com/2001-M-R-950-01/pdfs/2001-902-01.pdfhttp://keithley.reprocenter.com/2001-M-R-950-01/pdfs/2001-902-05.pdfThese also work. They are the repair manual and addendum.

author: macboy
author_rank: Super Contributor
timestamp: April 07, 2015, 05:39:53 pm
content: TiN and I have been pouring over these since finding them yesterday, but good find anyway! (Note the teaser yesterday inthis thread). I wonder how long they have been up there undiscovered. The main page with links is:http://keithley.reprocenter.com/2001-M-R-950-01/keithley.html

author: BFX
author_rank: Frequent Contributor
timestamp: April 07, 2015, 06:07:59 pm
content: Thank you

author: analogNewbie
author_rank: Regular Contributor
timestamp: April 07, 2015, 11:47:40 pm
content: Well, I did search the domain name in the forum before post this thread, but found nothing.This forum is the original source. My friend sent me the PDFs yesterday, and I Googled out the online document.Thks for the great discovery.

author: rf-design
author_rank: Regular Contributor
timestamp: April 09, 2015, 08:01:44 am
content: Did someone go through the schematic of the analog board and the ADC?The ADC Integrator have one postive and two negative integration inputs in addition to the signal integration input. All with different scale factors. I thougt that a multiramp should have symmetric inputs. Or do I miss somewhere a signal polarity switch?The AD buffer only seems to supply gain x1,x2,x5,x50 not polarity...
Is there anything in the pipeline that beats the Rigol 1054z? - Page 1
Forum section: electronics / testgear

author: milow
author_rank: Contributor
timestamp: April 08, 2015, 08:37:57 pm
content: Hello everybody,the Rigol 1054z seems to have the best bang-for-the-buck in the sub 500/600$-region (please correct me if that's not true). Sure it has its flaws (Serial Decoder only decodes whats on the screen; Jitter issue completely solved?). Considering the past, I don't expect Rigol to fix many software related bugs. But tacking its hackability into account, it seems to be very good for its price.Do you think there will be (or is) anything better in the sub 500-600$-region on the market in the next two years?Best regardsmilow

author: AG6QR
author_rank: Frequent Contributor
timestamp: April 08, 2015, 09:30:27 pm
content: Quote from: milow on April 08, 2015, 08:37:57 pmThe other players won't stand by and let Rigol take this entire market. Granted, maybe LeCroy, Rohde & Schwarz, and Tektronix aren't really shooting for that end of the market, but Hantek, Siglent, Instek, Owon, and similar manufacturers will play in that space, and will attempt to be competitive.If you've been watching over the past decade, the clear trend has been toward more functionality for less money. Look at the price history of the DS1052E. Over about five years, it dropped from around $700 to around $330.I don't know specifics, but I'd expect that, over the next two years, there will be price reductions and/or feature enhancements in the sub-$600 range. That's not going out on a wild speculative limb, it's just observing the trends over the past few years and projecting them forward.It's like buying a computer. You know that, whenever you buy one, at whatever price point, something better will be coming in a few months or years. Don't look at it as an investment that will grow in value. Look at it as a depreciating asset that, nevertheless, will be worthwhile as long as you can get most of your money's worth of usefulness out of it over the first couple of years.
Product Overview Handheld Oscilloscopes - Page 1
Forum section: electronics / testgear

author: aat24
author_rank: Contributor
timestamp: April 08, 2015, 07:11:05 pm
content: We published a free product overview "Handheld Oscilloscopes" covering products with a bandwidth of at least 50 MHz. It is available here:http://oscopes.info/market/2310-handheld-oscilloscopes-product-overview
Agilent MSOX2000 Digital Probe Pin Out - Page 1
Forum section: electronics / testgear

author: rickstar
author_rank: Newbie
timestamp: April 07, 2015, 06:45:20 am
content: Hey Guys I am trying to adapt an IDE cables and some probes to build a home made MSO probe setup, for a MSOX2022A.I foundhttp://literature.cdn.keysight.com/litweb/pdf/5968-4632E.pdfThis is a great document and shows all the pin outs.Does there need to be any capacitors or resisters in line to the probes from the MSOX IDE type connector?

author: georgd
author_rank: Regular Contributor
timestamp: April 07, 2015, 04:21:27 pm
content: In same documet you can find passives in probe heads.https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/msg365750/#msg365750Probe axcts as 10:1 divider, series resistor 90.1k is mandatory!Georg
Free to Good Home - CRO, Sydney Australia - Page 1
Forum section: electronics / testgear

author: tec5c
author_rank: Frequent Contributor
timestamp: April 04, 2015, 09:48:49 am
content: I've been trying to tidy up my work bench and as a result I want to get rid of an old CRO that was given to me from a work colleague. It was received with "Ch1 Faulty" written on it, no other details. I powered it up and ch1 seems to work, to an extent.The CRO is a Trio CS - 1060, 60MHz BW.I would prefer to give this (free of charge) to a beginner who has little cash to afford a scope. It's nothing fancy but it'll get you out of trouble.I am in Sydney, Australia. I'd prefer to arrange a pick up/drop off rather than posting the unit anywhere.Here is a photo of the unit - 100kHz sinusoid on Ch 1. So I'm not sure what is meant by faulty unfortunately. Perhaps a bandwidth related problem?Please let me know if you're interested.

author: ozwolf
author_rank: Regular Contributor
timestamp: April 07, 2015, 02:44:40 am
content: Hi tech5c,I'm in Toowoomba Qld 4350.If no one else is interested, I just need to figure out how to get it here.Would you mind sending me weight, and dimensions?Ozwolf

author: tec5c
author_rank: Frequent Contributor
timestamp: April 07, 2015, 03:06:00 am
content: Attn ozwolf: I have sent you a pm.

author: ozwolf
author_rank: Regular Contributor
timestamp: April 07, 2015, 04:28:32 am
content: Reply sent
IS2 File Reader Android - Page 1
Forum section: electronics / testgear

author: agarcia
author_rank: Newbie
timestamp: April 07, 2015, 03:25:20 am
content: HiOne year ago, I bought a Ti-400,and since 2 months ago I worked in a app from android to read IS2 files in my SmartPhone.It is a Beta version but work well with my IS2 Files.FeaturesSupported CamerasFluke Ti400IrFusionIr-Photo NotesImageInfoImage TimeEmissivityBackground TempTransmissionImage RangeAverage TempCamera ModelPalettesIronBowBlueRedHotMetalPlease visit my channel and watch a desmostration of the appIrFusionIs2 Viewer Beta
v/div new to rigol ds1054z - Page 1
Forum section: electronics / testgear

author: iamjohn
author_rank: Newbie
timestamp: April 06, 2015, 10:53:40 pm
content: Hello,I'm new to using the Rigol 1054z and don't see what I think I should be seeing as far as the volts/div and what's on the screen.I'm connected to a signal with a maximum of 5 volts, yet the scope seems to be showing 35.2 volts. Am I missing something very obvious?I've attached a screen capture.

author: XFDDesign
author_rank: Frequent Contributor
timestamp: April 06, 2015, 10:56:22 pm
content: Can you share details of what you're measuring, what your source is, what kind of probe you're using is, etc?

author: Lightages
author_rank: Unknown
timestamp: April 06, 2015, 10:57:49 pm
content: I bet you have the probe setting in the channel menu set to 10X but have the probe set to 1X.

author: iamjohn
author_rank: Newbie
timestamp: April 06, 2015, 11:03:22 pm
content: That was it - probe set to 1x, scope set to 10x - great - Thanks!!
choice of multimeter - Page 1
Forum section: electronics / testgear

author: marc.collin
author_rank: Newbie
timestamp: April 08, 2015, 06:54:37 pm
content: hii have a old multimeter. i bought new banana test probehttp://www.digikey.ca/product-search/en/test-and-measurement/test-leads-banana-meter-interface/2294789?k=1%20501-1004-NDit don't fit on my multimeter, so i search a new multimeter who will accept this banana test probe.i search something under 100$thanks

author: plazma
author_rank: Frequent Contributor
timestamp: April 08, 2015, 07:00:56 pm
content: You can cut away the protective tube around the probe banana plug. I did it for one pair.

author: electr_peter
author_rank: Unknown
timestamp: April 08, 2015, 07:26:13 pm
content: No need to do any modifications, just get these adapters:http://www.ebay.com/itm/200904597758

author: marc.collin
author_rank: Newbie
timestamp: April 08, 2015, 08:24:05 pm
content: thanks i bought it,.... will save money.
My Startup SMD Equipment [Crosspost] - Page 1
Forum section: electronics / testgear

author: sentry7
author_rank: Regular Contributor
timestamp: April 05, 2015, 05:50:16 pm
content: Sorry for the crosspost, I put it inBeginnersand thought it would be better suited here.Anyway, I finally had time enough to sit down and finalize my "cart": stuff I'm getting to start my SMD workbench. Here's what I got so far.Hakko FX888D Soldering StationYIHUA 858D Hot Air Rework Station0.3mm 63/37 Rosin Core 1.2% Solder1.5m 2mm Desolder WickKester 951 Flux PenKester EP256 63/37 Lead Solder PasteESD Tweezers / ForcepsDesoldering Pump / Sucker10X Headset MagnifierI need to find out whether the tips for the Hakko 936 are compatible with the FX888D, but other than that, here's what I have. Any suggestions?

author: hamster_nz
author_rank: Super Contributor
timestamp: April 05, 2015, 07:07:48 pm
content: If you want a box of SMD bits to play with, I can strongly recommendhttp://www.seeedstudio.com/depot/Open-Parts-LibraryBasic-V2-p-1560.html- the contents list is here :http://www.seeedstudio.com/document/pdf/OPL%20Basic.pdfYou can also buy bags of single parts too -http://www.seeedstudio.com/depot/OPLopen-parts-library-catalog-c-136_138- For example a bag of 10 x DS1307ZN costs $10 - they are about $4.50 per unit on Digikey NZ.The good thing is that Seeed also supply a library for use in Eagle.

author: skyjumper
author_rank: Regular Contributor
timestamp: April 05, 2015, 10:42:34 pm
content: I like to work on an anti static soldering mat. They can be a bit pricy though.

author: mskobier
author_rank: Regular Contributor
timestamp: April 05, 2015, 11:30:48 pm
content: Sentry7,I would also recommend a pair of SMD soldering/desoldering tweezers. This is the type that is actually two soldering irons in a tweezer type frame. Sure makes removal of smd resistors/capacitors/diodes, or any other two contact device. You can even get wider tips for removal of SOIC chips. The cheap pair I have made quick work of removing several smd resistor/capacitors on a board I worked on recently.Mitch

author: dadler
author_rank: Unknown
timestamp: April 05, 2015, 11:33:02 pm
content: I just upgraded from the FX-888D to the FX-951 and could not be happier. The "sleep" option is great and the tip is back up to operating temperature by the time I am actually soldering. It's much easier to change the set temperature, as it has actual up/down buttons.It also seems to maintain more consistent tip temperature vs the 888D. I zeroed the temp offset calibration and with a little solder wetting of my thermocouple tip, I measured 680.1F with a set temp of 680F. Haven't tried measuring the temperature during actual soldering, but I am certainly better able to maintain consistency with this iron vs the 888D.The integration of the tip and heating element does increase the cost of the tips, but I like the benefits. It's much faster to swap tips, and the include a cute tip holder with the 951.I still have my 888D as a backup, and for cases when I need two irons at the same time (happens periodically in SMD work, especially when desoldering).Just thought I'd mention the option.
HP 89400 Series VSA Options Disk - Page 1
Forum section: electronics / testgear

author: tec5c
author_rank: Frequent Contributor
timestamp: April 05, 2015, 12:11:58 pm
content: I am trying to track down the "Options Disk" files for a HP 89400 series vector signal analyser (89440a in particular). There are a few software option upgrades that came on a 3.5" floppy disk. I have done a quick search online and haven't been able to find much, I thought HP/Agilent/Keysight would have been nice and released the files for download but it doesn't appear so.I was wondering if anyone on the forum had any of the option upgrade disks and/or files for this series of equipment, or at least know of a way to get a copy? (yes, I will purchase the legitimate disk)Any help is greatly appreciated.
MK-168 Transistor Tester, weird characters  - Page 1
Forum section: electronics / testgear

author: Flump
author_rank: Frequent Contributor
timestamp: April 04, 2015, 08:22:16 pm
content: Version 1.11KI had one of these earlier last year (might have been an earlier Version)but gave it to my mate because he liked it so much.Well I bought another and it arrived today but when measuring 78* Regulators and some DiodesI get weird characters on the screen like on the picture below, I don't remember my old one doing thiscan anyone confirm if theirs do the same or if mine is faultyor maybe the older ones didn't try to measure Regulators

author: HKJ
author_rank: Super Contributor
timestamp: April 04, 2015, 10:15:31 pm
content: I did a review of on some time ago and there one of the diode symbols looked that way.http://lygte-info.dk/review/ComponentTester%20MK-168%20UK.html

author: Flump
author_rank: Frequent Contributor
timestamp: April 05, 2015, 12:11:21 am
content: Hi HKJGreat review and nice detailed pictureslooking at the links you posted at the bottom took me herehttp://www.mikrocontroller.net/svnbrowser/transistortester/Software/Markus/and it looks like we might be able to upgrade the firmware on these ?I wonder what version the one you did the review on was ?

author: radioFlash
author_rank: Regular Contributor
timestamp: April 05, 2015, 12:30:08 am
content: This device is the topic of one of the ongoing thread "$20 LCR ESR Transistor checker project". I ran into a similar glitch that the software developer fixed. The issue is that some LCD controllers require some wait time before updating, otherwise characters got corrupted. Here's a link to some messages discussing it:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg482353/#msg482353
DS2000A - Cursor positions moved in saved screenshot! - Page 1
Forum section: electronics / testgear

author: DG5SAY
author_rank: Contributor
timestamp: April 04, 2015, 10:15:59 am
content: Hi there,I own a DS2072A (Hardware 2.0, Firmware 03.03.SP1). When I set the cursor (X and Y, A and B) to a waveform on the scope and then save it as a picture to a USB-stick, the cursors on the saved picture file are not on the same position than on the scope screen !!!See attached files, one is the saved screenshot, the other is made with a camera as a "evidence".On the scope screen, the cursor position doesn´t moved after the saving process!It don´t matter what kind of waveform or what channel is used.Has anyone a idea what is going wrong, or can verfiy this with his own scope?

author: DG5SAY
author_rank: Contributor
timestamp: April 04, 2015, 11:17:14 am
content: Quote from: PeDre on April 04, 2015, 11:08:04 amGreat! This way works perfect!Danke Peter!Ralf.