hybridfree/eevblog-posts huggingface dataset:
100MHz oscilloscope review - Page 1
Forum section: electronics / testgear

author: wayne
author_rank: Newbie
timestamp: November 30, 2013, 07:24:26 am
content: 1.1 Instruments usedSIGLENT SDS1102CMLSpecificationsBased on the CSV file:Model Number: SDS1102CMLApprox. 450USD onAgilent Technologies DSO6054ASpecifications500MHz4Gsa/s4Msample/ch memory depth7000USD on ebay.comAgilent Technologies DSO-X 3024ASpecifications1channle: 4Gsa/s (Interleaved)2-4channel: 2Gsa/s200MHz bandwidthApprox. 3500USD athu.rs-online.com1.2 Bandwidth limitI tested the bandwidth limit by an 1Vpp sine wave at 100MHz. The reference instrument was a Tektronix 500MHz oscilloscope. The display at 10MHz was identical on the two scopes. At 100MHz I measured about 0.7Vpp on the SDS1102CM, while the Tektronix still measured 1Vpp. The bandwidth limit of the SDS1102CML is really 100MHz, and I'm so sure that the bandwidth can be upgraded to 150MHz or more, maybe some hacker had tried.1.3 Memory depthThe memory depth is 1Mpoints/channel, as it can be seen from the CSV file header. See the spectrum measurements. The point in this test is to analyze that if I stop the acquisition than how detailed information can be seen in the signal by zooming into it.This is an SPI communication at 8MHz clock. In a 25us/div setting one packet of data does not fill the screen. The packet time (16 byte) is about 32us, so the screen is now about 150 bytes long. (Plus the dead time.)Settings- Memory Depth: LongMem- Trigger: Normal

author: tautech
author_rank: Super Contributor
timestamp: November 30, 2013, 08:06:23 am
content: Welcome to EEVblogCan you post hardware and firmware versions of your Siglent.Have you checked the Siglent site for latest firmware?

author: tautech
author_rank: Super Contributor
timestamp: December 07, 2013, 07:18:11 pm
content: This link works fine for Siglent Firmware.http://www.siglent.com/en/server/download.aspx?nodecode=119004002006

author: cseb
author_rank: Newbie
timestamp: December 13, 2013, 05:50:48 pm
content: Hi Wayne,Will you copy the whole of my review or do you give the original url?Hi tautech,At the given link I can only find the firmware for the CML, not the CM. Have you tested it on an SDS1102CM?Regards,Csaba

author: neslekkim
author_rank: Super Contributor
timestamp: December 14, 2013, 12:00:20 am
content: Quote from: cseb on December 13, 2013, 05:50:48 pm+1(found your original review...)

author: wayne
author_rank: Newbie
timestamp: May 26, 2014, 03:03:13 am
content: Quote from: wayne on November 30, 2013, 07:24:26 am

author: rf-loop
author_rank: Super Contributor
timestamp: May 26, 2014, 05:12:10 am
content: Here is typical SDS1102CMLfrequency response. (from old lab test)And I have tested several of these. This is not best individual unit, this is more like worst case.MoreBtw, Models with small screen (as your image), example SDS1102CM is totally obsolete model. Ancient 5.7" screen models production have stopped long time ago by Siglent.
Bare Paint conductive paint for conductive elastomeric buttons - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: May 25, 2014, 08:48:18 am
content: Picked up two 8840a's and two 8840a/af's yesterday. Got them super cheap because they all had problems.The two 8840a's just did not work, but had bright displays with intermittent button repsonse. The 8840a/af's had very dim displays.Swapped the displays and essentially now have two 8840a/af's that work nicely with the exception of the buttons.I found out real quick that you DON'T use IPA on the "traces" for the button pads as the alcohol practically wipes the carbon off the board.Well, as an experiment, I tried this stuff called "Bare Paint". Got it from Radio Shack.This stuff is kind of thick, so I had to mix it with just a tad of water to slightly thin it.Using a the end of a resistor and a 15x microscope, I applied a thin layer of this stuff on the remnants of the carbon pattern on the board.Stuff was completely dry in about 20 minutes.Reassembled the meter and she works like a champ!

author: Dawn
author_rank: Regular Contributor
timestamp: May 25, 2014, 05:39:34 pm
content: I never thought of using a conductive pen. I use a product called Keypad Fix that works very well and easy to work with . There's other similar products aimed for the consumer electronics service market.

author: xwarp
author_rank: Frequent Contributor
timestamp: May 25, 2014, 06:11:29 pm
content: This stuff worked pretty well, but it's pricey for what it is.Found a few pages on DIY conductive glue/paint.

author: DJ
author_rank: Unknown
timestamp: May 25, 2014, 08:20:16 pm
content: Conductive paints work, but when they flake off cause obvious issues. That being said, good job patching them up

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 25, 2014, 08:29:15 pm
content: http://www.bareconductive.com/
DC Load - Page 1
Forum section: electronics / testgear

author: benjamin545
author_rank: Contributor
timestamp: May 25, 2014, 02:05:42 am
content: http://www.ebay.com/itm/NEW-150W-ELECTRONIC-DC-LOAD-METER-TESTER-CV-CI-CR-/351059974613?pt=LH_DefaultDomain_0&hash=item51bcce19d5is that about the cheapest you can find a DC load? i don't know all that much about them. but i would like to try and find an adjustable load for a reasonable price.i know its just some cheap Chinese model, so the "FUC" brand probably doesn't tell much at all about the quality of the product... or maybe it does.

author: iRad
author_rank: Regular Contributor
timestamp: May 25, 2014, 02:34:42 am
content: Topic on this load already started with topic title "EL63150B electronic load".here:https://www.eevblog.com/forum/testgear/el63150b-electronic-load/msg380147/#msg380147
Saleae Logic16 16-Channel USB Logic Analyzer - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: May 24, 2014, 11:01:19 pm
content: Has anyone played with this one yet? I was considering buying it because the reviews were pretty good. The software looks nice and seems to have a fair bit of capability. Looks like it can be bought for around $300 dollars. Only problem, it's limited to 100Mhz sampling for 2 channels, 50Mhz for 4 channels, and so on. But for the price it's not bad.https://www.saleae.com/logic16Thoughts? Suggestions?

author: jpb
author_rank: Super Contributor
timestamp: May 24, 2014, 11:26:08 pm
content: I think there has been quite a lot of discussion on these forums if you do a search on Saleae.The Logic16 is the one that they have been producing for some time and is USB2. They are in the process of producing a set of USB3 versions which are much faster (and sadly more expensive) - they are on the site under Logic 8 Pro and Logic 16 Pro and only available currently for pre-order. You may have already looked at them and decided they are too pricey but their specs are much better as well.See this thread for the discussion on them:https://www.eevblog.com/forum/testgear/new-saleae-digitalanalog-analyzers/

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: May 24, 2014, 11:28:30 pm
content: Thanks, my bad. Did not even think to search the forum.Thanks for the input!

author: Rory
author_rank: Frequent Contributor
timestamp: May 25, 2014, 12:50:21 am
content: I have been getting a lot of use out of my Logic 16. Understand this is not a real-time analyzer but records the events and you play them back or scan through the info.Here's a discount code for 20% off if you buy one.http://saleae.refr.cc/L6H7DB7
MASTECH MS8226T DMM problem - Page 1
Forum section: electronics / testgear

author: crnazvijezda
author_rank: Contributor
timestamp: May 10, 2014, 07:56:40 pm
content: Hi all,My MS8226T is about 3 months old and it was good until today.It work on all functions except on resistance position measurement (resistor/diode/buzzer on one position).So, problem is nextWhen I put it on resistance position after auto range it start to show 0 Ohm which start to blinkone time per second.When select resistance it showing 0 and no change except blinking.??When select diode it measuring good.When selected buzzer it buzz whole time but when connect probes (shortcircuit) it stop buzz.??Same when it is not on manual range.Do anyone have some suggestion what to do?Thanks in advance!Regards,Tomy

author: dannyf
author_rank: Super Contributor
timestamp: May 10, 2014, 09:00:43 pm
content: QuoteReading the manual?

author: crnazvijezda
author_rank: Contributor
timestamp: May 11, 2014, 06:57:33 am
content: Yes, I read the manual and have knowledge how to work with.I made short video (YT unlisted) about problemRegards

author: crnazvijezda
author_rank: Contributor
timestamp: May 19, 2014, 05:48:24 pm
content: Short update.Now only diode works and nothing else

author: Lightages
author_rank: Unknown
timestamp: May 19, 2014, 07:03:44 pm
content: I am sorry to see your problems. I have a rather low opinion of Mastech and IMHO it has probably just died and isn't worth fixing. I would rather just buy a new meter than waste time trying fix something made by Mastech.

author: Wytnucls
author_rank: Super Contributor
timestamp: May 19, 2014, 07:19:44 pm
content: Open it up and look for bad solder joints or shorts on the PCB.Post a link to a high res picture of the inside and someone might be able to help you.

author: deth502
author_rank: Frequent Contributor
timestamp: May 19, 2014, 09:50:12 pm
content: i concur with the previous 2 posts.open it up and look for any obvious faults. bad solder joints, burnt/broken traces/components, and fix as necessary. if that dosent work, its not a very expensive meter, and is likely not worth putting more money/time into it than that.

author: Wytnucls
author_rank: Super Contributor
timestamp: May 20, 2014, 03:55:55 am
content: Have a look also at the range switch contacts and clean the PCB range switch traces.

author: crnazvijezda
author_rank: Contributor
timestamp: May 24, 2014, 06:48:51 am
content: Thanks to all for suggestions!I check all traces and elements. One capacitor was bad look and too small capacity and I changed it.Cleaned PCB and switch traces. No change.Seems that problem is in microcontroller and this part is not accessible. Unfortunately it is not usable any morebut fortunately I'll buy new and probably much better, no more those cheap.
Rigol ds4024 Saving speed - Page 1
Forum section: electronics / testgear

author: qwaarjet
author_rank: Regular Contributor
timestamp: May 23, 2014, 10:15:15 pm
content: I have a Rigol ds4024 and when I attempt to save the full memory 140Mpts to CSV it never completes saving the data file. I've had it saving for 30+ minutes and it never gets past 1% this seems slow, for even USB1.1 speeds, to me. I've attempted to try transfers over USB and ethernet with it but dumping the full memory never seems to works. Capturing data on the screen is seems slow to me at about 30 seconds but it is at least tolerable. Any recommendations on course of action to speed this process up?

author: dr.diesel
author_rank: Super Contributor
timestamp: May 23, 2014, 10:56:18 pm
content: I've never tried a full 140Mpts! I'm assuming you're on the latest FW version, 00.02.01?

author: TooOldForThis
author_rank: Regular Contributor
timestamp: May 24, 2014, 12:24:15 am
content: With one channel enabled, my 4024 writes about 12,500 samples per minute to a USB CSV file. So a full 140MB dump would take about 3 hours. 12,500 lines of the file is about 250KB of text so the scope has a write speed of 250KB / minute. Rigol has an improvement opportunity here.

author: qwaarjet
author_rank: Regular Contributor
timestamp: May 24, 2014, 12:45:37 am
content: Apparently I have an ancient version 00.00.04 I sent in request for the latest version. but I dont know how much it will help.
tektronix 465 without trace just a dot - Page 1
Forum section: electronics / testgear

author: v1t0r
author_rank: Contributor
timestamp: April 04, 2014, 01:37:15 pm
content: Hello everyone, I have a tektronix 465 that until a short time worked well, but turned on a few days ago and appears only a dot no trace.If I put in X / Y mode I can move the point with position knob in X and Y, from what I understand the problem is related to the sweep board but i dont have another scope to test and no idea where to look, if someone can help me locate the cause of the problem would be very grateful.I appreciate all the help given.

author: PaulAm
author_rank: Frequent Contributor
timestamp: April 04, 2014, 01:45:45 pm
content: Sounds like the HV, vertical, horizontal and likely power supplies are OK.If it's an early 465, all of the transistors are socketed. Try reseating the transistors. While helping out repair, they are a major reliablity issue. I've fixed several scopes just by reseating semiconductors. They used individual pin sockets; they don't look like traditional transistor sockets.At some point they started to solder the transistors; I think around '82 or so.

author: GreyWoolfe
author_rank: Unknown
timestamp: April 04, 2014, 10:41:39 pm
content: try cleaning and working the time base and channel rotary controls. I brought a tek 2235 back to life doing that.

author: gearhead
author_rank: Contributor
timestamp: May 22, 2014, 07:09:24 am
content: Did you find the problem? And if so what was it? I have a 475 that wouldn't sweep, tracked it down the sweep board, the sweep IC was in backwards, of course it was fried.

author: v1t0r
author_rank: Contributor
timestamp: May 22, 2014, 07:06:09 pm
content: Yes already fixed it, and in fact was also the ic sweep U870.
uCurrent, are they in stock? also bandwidth? - Page 1
Forum section: electronics / testgear

author: jeremy
author_rank: Super Contributor
timestamp: May 21, 2014, 11:35:13 pm
content: Hi all,I'm in need of a microcurrent in a fairly short time frame. Has anyone ordered one from the EEVBlog store recently? are they back in stock?Also, what sort of bandwidth can you get out of them? I'm trying to look at the dynamic current draw of a microcontroller with very low power usage.

author: Legit-Design
author_rank: Frequent Contributor
timestamp: May 21, 2014, 11:40:59 pm
content: https://eevblog.myshopify.com/Quote from:https://eevblog.myshopify.com/Quoted all the specs...There has not been any complaints about it not meeting it's spec, I would trust Dave would have told us about shortfalls if there were any. Accuracy quoted is of course over the full range.https://www.eevblog.com/forum/crowd-funded-projects/current-gold-on-kickstarter/510/Apparently they are in stock since Dave just added them today/yesterday...

author: jeremy
author_rank: Super Contributor
timestamp: May 22, 2014, 12:06:41 am
content: great! Thanks. Clearly my search abilities are inferior to yours....

author: Legit-Design
author_rank: Frequent Contributor
timestamp: May 22, 2014, 12:19:17 am
content: I think Dave has video about design decisions that went into the new uCurrent, one of which was the 300KHz bandwidth vs 8KHz bandwidth to make it easier to measure current consumption of modern microcontrollers with their sleep patterns.

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: May 22, 2014, 07:15:46 am
content: Is the box, enclosure ESD safe?
Tektronix "Concepts" Series Books - Page 1
Forum section: electronics / testgear

author: Joule Thief
author_rank: Regular Contributor
timestamp: May 21, 2014, 05:10:38 am
content: A wealth of information on Tektronix test equipment theory and operation.Enjoy.http://www.davmar.org/concepts.html

author: TVman
author_rank: Frequent Contributor
timestamp: May 21, 2014, 05:11:46 am
content: Wow, what a collection!

author: Sailor
author_rank: Regular Contributor
timestamp: May 21, 2014, 11:23:31 am
content: Fabulous!!!!They will go with my copy of 'Vertical Amplifier Circuits' that I bought in 1970. At a cost of - wait for it - one dollar! Yes, that was the official price for an absolute gem of a book. I've always kicked myself for not buying the rest of the series, and now here they are.Thank you very, very much.

author: gearhead
author_rank: Contributor
timestamp: May 21, 2014, 04:24:49 pm
content: A COUPLE LINKS DIDN'T WORK VERY WELL, SO HERE IS ANOTHER SIGHT THAT HAS THE TEKTRONIX BOOKS AND OTHERS:http://w140.com/sbcman/Technical%20Manuals-Main/Tektronix/Concepts/

author: Sailor
author_rank: Regular Contributor
timestamp: May 31, 2014, 01:12:11 am
content: Probably available elsewhere, but I have just found a copy of Welch "Spectrum Analyzer Measurements" 062-1070-00 at the following link:http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/publikacje/Tek_Spectrum_Analyzer_Measurements.pdf
Digatron RCT 10 Military capacity tester Wiring? - Page 1
Forum section: electronics / testgear

author: padda94
author_rank: Newbie
timestamp: May 11, 2014, 03:37:03 pm
content: Hi first time user on this forum.I recently bougt a Digatron RCT 10 Rated capacity tester in a thrift store. It is from around 1981, and was used in the Norwegian militarys battery research lab. I got it quite cheap and the owner said he would have more ex- military equipment coming in next month, so maybe some of it will find it way into Dave's mailbag.All of the external cables were cut of and i have not been able to find any wiring diagram of this device online. So i was hoping there is someone here that were able to help me wire it up. I have the mains figured out (that is fairly straight forward) But there is four more cables left that i cant figure out. Maybe i am missing some parts? Anyways these are the cables:All of them are coming out the back of the caseTwo red:One thick going from red battery test terminal on the front panel. Also a cable connected inside the case.One thin coming from red "sense" terminal on front panel. Also connected to the analog voltmeter and ampmeter.Two black:One thick going from blue battery test terminal on the front panel. Also a cable connected inside the case.One thin going from blue "sense" terminal on the front panel. Also connected to Analog volt and amp meters.Hope someone is able to help. Will try to post pictures later. Atleast it powers up. Fan is working, and i just filling my room with the smell of old electronics.

author: Vgkid
author_rank: Super Contributor
timestamp: May 11, 2014, 06:10:51 pm
content: As you described it, it is set up for a 4 wire measuring mode, it sounds like it has an internal current shunt(thick wires)with the thinner wires connected to the battery/load to measure the voltage.Pics are needed, im just guessing here.

author: padda94
author_rank: Newbie
timestamp: May 11, 2014, 06:33:34 pm
content: Here are some pictures:The two thick cables:The case:

author: padda94
author_rank: Newbie
timestamp: May 21, 2014, 08:18:47 pm
content: Does no one else have any more information on this ?
What are Tek 2430A bezel dimensions? - Page 1
Forum section: electronics / testgear

author: rbm
author_rank: Regular Contributor
timestamp: May 21, 2014, 12:03:06 pm
content: Hi,I need to know the dimensions (height and width) of the screen bezel for a Tektronics 2430A. I don't own or have access to one and this info is not available in the manuals I can find online. The dimensions I'm after are outside edge to edge of the bezel surround. Would someone be able to post this?

author: kc9qvl
author_rank: Regular Contributor
timestamp: May 21, 2014, 11:01:38 pm
content: Would a 2440 do yah. Should be the same. Also post a picture of from any 2430 and place marks exactly where to measure.

author: David Hess
author_rank: Super Contributor
timestamp: May 21, 2014, 11:17:42 pm
content: I measured 4.15 inches tall and 5.72 inches wide for the outside dimensions of the camera mount flange with a 0.1 inch wide and 0.1 inch deep groove inset about 0.1 inches (my calipers will not clear) on the top and bottom on a 2440. The groove on the bottom is centered and only about 1.15 inches wide which makes sense to keeping the camera mount centered. The 22xx series match those dimensions as well within 0.01 inches so they would take the same camera adapter.Do you mean the entire removable bezel?

author: rbm
author_rank: Regular Contributor
timestamp: May 21, 2014, 11:57:41 pm
content: This picture shows the dimensions I am interested in knowing:I believe that David posted the dimensions above, based on my reading his descriptions ("outside dimensions of the camera mount flange"). Thanks very much. The camera mount flange thickness was very helpful also.You read my mind as well because these are needed so that I can understand whether a certain camera mount for the 2430A will work (or not work) with my Hitachi V695.

author: David Hess
author_rank: Super Contributor
timestamp: May 22, 2014, 01:14:39 am
content: Those are the dimensions I measured.The total thickness of the camera flange is 0.3 inches with a 0.1 inch groove at the top and bottom. The top groove runs the full length but the bottom groove is horizontally centered below the CRT and 1.15 inches long.And like I said, the 22xx oscilloscopes have the same measurements and would take the same camera mounts.

author: kc9qvl
author_rank: Regular Contributor
timestamp: May 22, 2014, 01:29:05 am
content: On my 2440 got 4 5/8" left to right ans 4 1/8" up and down
RIGOL 2072A SPI Trigger Issue - Page 1
Forum section: electronics / testgear

author: diyaudio
author_rank: Frequent Contributor
timestamp: May 21, 2014, 12:22:34 pm
content: HiCan someone please verify this, I'm able to trigger on SPI when clock frequencies are 500Khz or above, running at a clock of 250Khz doesn't trigger I cannot see any decoded data packets, I can see the clock and data so I can verify data is there, just no data decoding and triggering.Rigol Software Version is 00.02.01
Tektronix 7704A voltage multiplier DIY replacement - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: May 16, 2014, 01:17:05 pm
content: Some of theTEK 7000 series scopes use 21kV CRT high voltage to achieve high beam intensity.During years of exploatation HV part become defect- prone.The simple project contains PCB of 21kV voltage multiplier (similar to TEK 152-0493-00).The components should have parameters:Capacitors: 470pF...2,2nF /4kVDiodes: Irms>50mA RMS; Vr>4kV; trr<100nsThe module must be well cleaned, dried in warm air, potted in urethane, silicone or epoxy.Use well insulated HVcable.It's better not to joke with 21kV.http://rfscientific.eu/tektronix-7704a-voltage-multiplier-diy-replacement

author: David Hess
author_rank: Super Contributor
timestamp: May 20, 2014, 06:05:58 pm
content: This looks interesting but I have not been able to access the linked web site and there is no parts list or construction details in the PDF file. I assume it needs to be vacuum potted.
Phase performance of 'extended' 'scopes - Page 1
Forum section: electronics / testgear

author: Sailor
author_rank: Regular Contributor
timestamp: May 19, 2014, 10:54:54 pm
content: May not be any problem at all, but I don't recall seeing any channel-channel phase measurements at the top end of 'bandwidth extended' scopes (Rigol, Agilent, etc). One would expect that all/whatever inbuilt filtering there is in these scopes is fairly soft and that the underlying full-bandwidth performance is good, but I think it should be looked at. Of course, if someone already has, then ignore this post entirely.Just a thought.

author: w2aew
author_rank: Super Contributor
timestamp: May 19, 2014, 11:10:19 pm
content: Quote from: Sailor on May 19, 2014, 10:54:54 pmWhat do you consider top end "bandwidth extended" scopes? I assume that you aren't referring to the real performance top end (30GHz +) since you included Rigol in the group...As far as channel to channel phase - are you simply referring to the timing skew between channels? Most of the better scopes give you the ability to adjust channel to channel skew, mainly to account for unequal cable/probe delays, etc.

author: Sailor
author_rank: Regular Contributor
timestamp: May 20, 2014, 09:34:06 am
content: Sorry, I wasn't clear. By top-end I meant the upper limit of the scope that has been 'extended'. i.e. if a 70MHz unit has been re-jigged to now deliver a -3dB point of 120MHz, what is the ch-ch phase difference around the 120MHz area. Ideally it would still be ~zero, but with filters involved, you never know until you measure them.

author: jlmoon
author_rank: Unknown
timestamp: May 20, 2014, 04:27:40 pm
content: Quoteand the birth of a group we shall call "Phase-Nuts".... I took a 200 to a 300Mhz.. let the analysis begin!JLM
ISO Knob for a HP8559 Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: lennyw
author_rank: Newbie
timestamp: May 20, 2014, 06:08:29 pm
content: Looking for a replacement for the "Frequency Span / Div" knob on a HP8559. If you have one or know where to find one pls let me know.TIA.Lenny WintfeldEE & Ham (W2BVH)
Global Specialities 6000 Frequency counter - Page 1
Forum section: electronics / testgear

author: DmitryL
author_rank: Regular Contributor
timestamp: May 18, 2014, 10:23:37 pm
content: Hello everyone.I got this ancient frequency counter in half-working condition. It is based on LS7031 and some small logic chips.I want to fix it just out of curiosity, but I don't have schematics. In theory it is possible to reverse-engineer it, but it would be to much for such low-end thing.Does anyone have a schematics/manual for this thing ?

author: Vgkid
author_rank: Super Contributor
timestamp: May 18, 2014, 10:50:52 pm
content: Google does not return anything, here is their contact info.mailto: tech@globalspecialties.com
Tektronix 2465B CRT text trouble - Page 1
Forum section: electronics / testgear

author: wallis
author_rank: Contributor
timestamp: May 17, 2014, 06:23:42 pm
content: Hello All,Have attached a picture of the text displayed on my Tektronix 2465B.Anybody had a similar problem, that they got sorted any ideas welcomed.Unit has working A5 card and a working U800Kind RegardsWalter
Tenma72-500 logic probe and pulse generator - Page 1
Forum section: electronics / testgear

author: Simon
author_rank: Unknown
timestamp: May 17, 2014, 05:41:22 pm
content: Mu BTEC L3 course in electronic engineering came with a logic probe and pulse generator in one. except I can't see how you can switch between the to functions. It's a TENMA 72-500 and the manual just talks about the two functions separately as though they are are not in the same device.Any idea's, is this thing garbage or am i missing something ?

author: PlainName
author_rank: Super Contributor
timestamp: May 17, 2014, 05:55:22 pm
content: The probe is the pointy bit along with the green/red triangular LEDs. This is always a probe.The pulse generator is the 3 metal studs at the other end. You clip the croc clip to one of those then apply the other end of the lead to the circuit under test. The pulse gen is always running (when the thing is turned on), and you can select between 0.5Hz and 400Hz pulse stream.The two studs closest to the yellow LED give you a pulse (10us/100mA capable) or square wave (5mA) output. The LED just shows when it's happening - slow flash for 0.5Hz, apparently always on for 400Hz. The last stud is an external sync input, letting you trigger the pulser from something else.

author: Simon
author_rank: Unknown
timestamp: May 17, 2014, 06:12:19 pm
content: Right, thanks, bit lame if you ask me but there you go. these days I'd not bother with a logic probe, just use my cheap crappy hand held scope that is crap as a scope but will give a very good insight into a signal.Now i know why the meter probe with large crocodile clip lead was with it. bit fiddly if you ask me.....

author: PlainName
author_rank: Super Contributor
timestamp: May 17, 2014, 08:14:08 pm
content: yes, the probe is a bit useless these days, but the pulser is jolly useful in conjunction with, say, a HP current probe. Just a shame the business stuff comes out the arse instead of the point bit

author: Simon
author_rank: Unknown
timestamp: May 17, 2014, 08:23:34 pm
content: All it would have taken was a 3 position switch to select between probe / pulse / square wave............. but i suppose it means you can use it as a probe and generator at the same time if you want a hand full of wires. I'd have expected the course to teach me to make my own pulse / wave generator with a 555......

author: PlainName
author_rank: Super Contributor
timestamp: May 17, 2014, 10:57:06 pm
content: The idea of the probe isn't to go looking at stuff like you would with a scope, but to see if the pulse the other end puts out gets through whatever gate(s) you're checking for correct operation. The pulser is able to override normal logic outputs without damage, so you can do in-circuit verification of operation even when the gate is being held in some state by static inputs.As such, the probe end would always be in use, so although you could rig your own switch it wouldn't be too useful
Schaffner Intepro, Dual DC Load and HF Scanner Unit. - Page 1
Forum section: electronics / testgear

author: 128er
author_rank: Regular Contributor
timestamp: May 17, 2014, 09:20:43 pm
content: Hi to all,bought this two devices from Ebay for 20€. Why? Because they look interesting and were cheapUntil now I did not spent much time to figure out whats going on there. The DC load is fairly obvious. The HF-"scanner" looks like some distribution unit, that is capable of switching high voltages to devices under test, or other measurement units in the rack, in various ways. Correct me if I'm wrong.I don't think it is worth the effort to reverse engineere the communication of the two units to remote control them. But even if not, there are many parts to keep. The power supply units, current shunt resistors, coaxial shielded reed relais (38 pieces), coaxial connectors, etc. . .Especially the DC load gives you almost all to build your own electronic load or hack the thing.Some informations about the parts and units:Dual DC load:www.inteproate.com/PDFs/DualLoad.pdfParts on the DC load:Shunt resistors:http://www.produktinfo.conrad.com/datenblaetter/425000-449999/447323-da-01-en-Praezisionswiderstand_PBV.pdfPrecision 5V reference:http://www.alldatasheet.com/datasheet-pdf/pdf/56862/BURR-BROWN/REF02C.html12 bit ADC:http://www.alldatasheet.com/datasheet-pdf/pdf/533853/AD/PM7543.htmlOP177 precision Opamp:http://www.alldatasheet.com/datasheet-pdf/pdf/49041/AD/OP177GP.htmlLT1013 precision Opamp:http://www.alldatasheet.com/datasheet-pdf/pdf/70250/LINER/LT1013.htmlHF Scanner unit:Coto 2920-12-121 Coaxial shielded reed relais:http://www.cotorelay.com/datasheets/Coto%20Technology%202900%20Reed%20Relay.pdf
u1773c 4 wire measurement. - Page 1
Forum section: electronics / testgear

author: kc9qvl
author_rank: Regular Contributor
timestamp: May 17, 2014, 05:30:57 pm
content: Was in Fry's yesturday and they had an agilent u1733c lcr meter open box for $200.00 US. No test leads. So i bought it. New battery and a spare set of short leads and all is good.Watched Dave's teardown unit does not seem capable of 4 wire measurement. So what would be next best route for (better/longer) test probes. Maybe tweezer type with 2-wire shielded cable. Shield to guard. Single conductor to plus and other to minus. Is there a better way?I know I could just buy the tweezer probe but that's boring.Thanks
Old Equipment (Keithley 220) and current GPIB Adapter/Interface   - Page 1
Forum section: electronics / testgear

author: Zucca
author_rank: Unknown
timestamp: May 17, 2014, 05:06:16 pm
content: I have no experience at all on the magic IE488 interface, and I need to start to play with it.I did my homework and this post was a winner:https://www.eevblog.com/forum/testgear/gpib-to-usb-controlleradapter/Looks like the F82357 Beiming is the way to go for me:http://bmjd.biz/index.php?m=content&c=index&a=show&catid=16&id=11but.. let me post my concerns before I buy it. This is a fairly recent adapter and the oldest GPIB test equipment I have is the glorious Kethley 220.Now, I smell a worst case in the air: will the F82357 work also with such a old device? Moreover, in general, is there some black magic which can ruin your 2014 day with an old IE488 1980 interface?I take the risk to post a stupid question, if this is the case sorry for that.
Tektronix capacitor change - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: May 16, 2014, 10:06:45 pm
content: Hi,Could you guy's with experience in changing caps on a Tek scope board validate this system?Is hot air a better solution?Please share your experience.Thankseurofox

author: David Hess
author_rank: Super Contributor
timestamp: May 17, 2014, 03:19:42 am
content: As long as it does not rip the pad off of the printed circuit board, it is probably better than heating the pad twice. I have occasionally done the same thing when removing parts that are going to be replaced without testing.

author: eurofox
author_rank: Unknown
timestamp: May 17, 2014, 10:02:46 am
content: Is use of hot air no better to remove the caps?Ripping off the caps from the PCB could destroy the PCB.If you have to remove up to 100 caps you can have luck with 90% but the rest could be catastrophic.eurofox

author: David Hess
author_rank: Super Contributor
timestamp: May 17, 2014, 11:19:21 am
content: Quote from: eurofox on May 17, 2014, 10:02:46 amI would not use hot air to rework a board like that because just a soldering iron works fine.With surface mount parts, it is sometimes easier to crush and remove the body with a pair of pliers and then unsolder the leads from the board.

author: bitshape
author_rank: Contributor
timestamp: May 17, 2014, 11:55:32 am
content: With a Tweezer-iron or just a set of 2 individual Soldering Irons you can take the SMT Caps off very easy. But please practice beforehand with some scrap board.

author: TMM
author_rank: Frequent Contributor
timestamp: May 17, 2014, 01:33:33 pm
content: Quote from: David Hess on May 17, 2014, 11:19:21 amEasier when access to the part is difficult but at a very high risk of lifting pads/traces in my experience.
HP 11664A detector DIY replacement - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: May 15, 2014, 10:47:14 pm
content: Older HP's scalar network analyzers can often be found on Ebay auctions at low prices.Unfortunately, lot of them are sold without (or with defected) microwave detector probes.I want to present simple project made few years ago. It allows to replace expensive HP 11664A detectors.You wil need:easy-to-get microwave detectors* such as "Hewlett Packard HP 33330B DETECTOR POSITIVE 0.01-18 GHz"circuit described in pdf file belowa piece of shielded RG174 coax (for modulated signal path)3-wire cable to provide +/- supply and ground return"C091-3374-501" Amphenol 5-pin connector*positive and negative output detectors can be used.Use proper resistor for diode biasing (R8 for posititive output detectors; R4 for negative output detectors)The performance is similar to 11664A detector. It will be sufficient for most HAM radio DIY applications.Some helpful pictures onhttp://rfscientific.eu/hp-11664a-diy-probe-replacement

author: simmconn
author_rank: Regular Contributor
timestamp: May 17, 2014, 02:00:53 am
content: Nice! It is essentially an HP 11664C adapter. The headache is that you need to calibrate it with a power meter first and every time you change the detector.
Rigol DS1064B Demo Mode? - Page 1
Forum section: electronics / testgear

author: kwass
author_rank: Frequent Contributor
timestamp: May 27, 2014, 05:06:37 am
content: I was installing a quieter fan in my Rigol DS1064B scope and when I turned it back on it came up in some sort of demo mode. The display is cycling though just about every function in the firmware and none of the controls respond. My guess is that when I was re-assembling it I powered it up to hear the fan and in the process had several controls pushed down.Does anyone know how to get it out of this mode?Thanks,Katie

author: kwass
author_rank: Frequent Contributor
timestamp: May 27, 2014, 05:57:48 am
content: Well after playing around with this for a while it turns out that the ribbon cable from the main PCB to the front panel was loose in the socket. Locking it down correctly fixed the problem.Wow, that was quite a show, every function just cycling around is what apparently happens when the firmware can't find the front panel.
Scope displaying waveform backwards? - Page 1
Forum section: electronics / testgear

author: elliott
author_rank: Regular Contributor
timestamp: May 16, 2014, 02:41:00 am
content: I recently got my Hitachi V-1150 running again and went to give it a good test before putting it to use. When comparing the output to my Tek I noticed something strange.I'm assuming the Tek is right, that is a 100% duty cycle sawtooth wave from my function generator. I know I didn't get the X backwards on the CRT when I put it back together since the text is displayed properly. Any ideas where to begin?

author: Rerouter
author_rank: Super Contributor
timestamp: May 16, 2014, 02:59:51 am
content: put them both on there slowest scan speed and see which way its moving, it almost looks like the Y is upside down, and could be the invert button for the channel

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 16, 2014, 03:10:18 am
content: It's an Aussie scope, turn it upside down so the electrons fall back into place.Tim

author: elliott
author_rank: Regular Contributor
timestamp: May 16, 2014, 03:16:58 am
content: Quote from: Rerouter on May 16, 2014, 02:59:51 amIt is scanning left to right just like it should. I can only invert channel 2 on both of them, that signal is going to channel 1.I think you are right that it is upside down instead of backwards. It can't be just the Y+ and Y- to the CRT switched since the text is fine. I could just swap them and it would be usable, though the menus are bad enough when they are right side up.I pulled the Y board to look for any signs of damage first. That is some high quality 1986 bodging.

author: tautech
author_rank: Super Contributor
timestamp: May 16, 2014, 03:24:48 am
content: One would assume the invert button on the Hitachi is on.

author: w2aew
author_rank: Super Contributor
timestamp: May 16, 2014, 03:32:19 am
content: Want to be sure? DC couple the channel, and apply a DC voltage and observe which direction the trace moves.If one of them moves in the wrong direction, and there's no invert function, then it's possible that someone was working on the scope and reversed the connections to the vertical deflection plates on the CRT.

author: elliott
author_rank: Regular Contributor
timestamp: May 16, 2014, 03:38:37 am
content: Quote from: tautech on May 16, 2014, 03:24:48 amOne would, but I can only invert channel 2, it is like this on all 4 channels. Inverting channel 2 makes that one right.I need to study the service manual some more.

author: elliott
author_rank: Regular Contributor
timestamp: May 16, 2014, 05:09:06 am
content: Apparently whoever made a mess of the power supply trying to recap it before I got it also reconnected something wrong.PEF-735C is quite happy being plugged into the vertical switching board in either direction. There is even a nice little cut out in the board to the left of it that allows that cable to pass conveniently under it, which is where it was when I got it. Rerouted the cable and turned it around and it is all good.
New Fluke 8846a problems - Page 1
Forum section: electronics / testgear

author: joesixpack
author_rank: Contributor
timestamp: May 16, 2014, 02:42:45 am
content: This week, I received a new Fluke 8846a, from tequipment.net. So far, I've had nothing but problems with it. I shot a quick video with some of the issues. Since I've never used one of these, I don't have a good feel for what is normal and not normal.If someone with experience could tell me it is broken, or conversely, I'm an idiot, I would be grateful.After chatting with someone at tequipment it looks like I have a 7 day window to start the RMA process for a return. The meter came with a calibration certificate dated April 7, 2014, so it obviously was working shortly before I received it.[Update: I've taken down the video. I don't want it to be indexed by Google search. The consensus is that the meter is behaving normally.]

author: c4757p
author_rank: Super Contributor
timestamp: May 16, 2014, 03:05:11 am
content: Your meter is fine. It reads Overload on mV because of the high impedance of the range - it picks up charge when you connect the cables. Try manually setting it to a range around 100V. The glitchy resistance reading appears to be a bad connection between the probe and the jack, because you just set it in lightly.I'll take it if you still think it's broken

author: joesixpack
author_rank: Contributor
timestamp: May 16, 2014, 03:12:04 am
content: Ok, I will order a new fuse from Fluke for the 400ma. It entirely possible I blew it while I was trying to get a reading while the front/rear switch was in a funky state.The consensus from the private messages and public comments I have received is that the meter is working as expected. I've taken down the video because I don't want it to be indexed by Google -- I think it would be misleading to newbies like me who are shopping for a meter.Thanks again guys.
Atten/Siglent ADS1022C DSO review/teardown - Page 1
Forum section: electronics / testgear

author: poorchava
author_rank: Super Contributor
timestamp: May 15, 2014, 07:44:43 am
content: Hi everyone, I wanted to try myself at doing a teardown video. This time it's ADS1022C which is I believe one of the cheapest "real" DSO's of all time.Please tell what should I improveAny opinions will be valuable. I hope my English is understandable enough

author: nuhamind2
author_rank: Regular Contributor
timestamp: May 15, 2014, 12:37:12 pm
content: My college lab has that (along with the 60Mhz version). I prefer using this when debugging my circuit because I can carry it around any table I want. But It's slow as hell, and seem going to hang when you press autoset.

author: mariush
author_rank: Super Contributor
timestamp: May 15, 2014, 02:56:04 pm
content: Good job with the video.. I skipped over the initial talk and started to look at the dissassembly and you did a good job.Some feedback... lightning at the video especially at the beginning, maybe too long intro, too much talk, but it's acceptable. Be more careful in the future with the focus on that camera. It won't focus below a certain distance, so keep the camera further away and use more light to make it focus easier.In the psu section you said somewhere foil capacitor when pointing to a X2 capacitor, the red "gunk" is thread-locker fluid (loctite makes a bunch of those :http://www.henkelna.com/us/content_data/168592_LT4985_Threadlocking_Guide.pdf)Your English is OK, don't worry about it.

author: poorchava
author_rank: Super Contributor
timestamp: May 15, 2014, 03:43:15 pm
content: Thanks for comments.I have already solved the light issue. I have quickly hacked 2 LED lamps 3x1W each. In frontend section you can see that lighting is much better.Focus is a problem, because the autofocus algorithm in my Galaxy SII sucks bigtime. Perhaps I'll try to use different app for the camera (of course unless the autofocus is done by hardware driver, then I have a problem).With capacitor - you're right.
Gould 3150 analog oscilloscope - user manual (now found) - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: February 13, 2013, 04:25:21 pm
content: Hello, I found this nice Gould 3150 150MHz scope at school and tried it. The instrument works fine. I need the pdf user manual, a leaflet, or any other info. I could not find anything ot the internet...Video here.Photos, that i took:https://plus.google.com/photos/106264218831814439783/albums/5844454688694290849Well, in fact the machine was produced by Hitachi in Japan. It might have been sold under different names than Gould 3150. Does anyone know this other name?

author: Hydrawerk
author_rank: Super Contributor
timestamp: February 14, 2013, 02:20:28 pm
content: Well, as I expected, this scope was often sold asHitachi V-1150.Here I found the service manual.http://elektrotanya.com/hitachi_v-1150_sm.pdf/download.htmlAnd here is user manual.http://elektrotanya.com/hitachi_v-1150_operation_manual.pdf/download.html

author: ecat
author_rank: Frequent Contributor
timestamp: February 14, 2013, 04:52:45 pm
content: Ooo, I have a one of those 1150s, it cost me about £1 per button which at the time was the only metric I was really interested in. In this respect it is second only to my Thandar DSAhttp://www.artisantg.com/TestMeasurement/68996/Thurlby_Thandar_DSA524_Digital_Storage_AdaptorBeing more realistic: 150MHz, 4 channels (-ish as only 1 & 2 have full functionality) a lovely screen and more functionality than the user interface can comfortably accommodate, I think it is a nice scope. Unfortunately mine only runs for about 10 minutes at a time but a quick power cycle and it's good for another 10 minutes. This leaves me with a big problem: do I continue to live with seeing the universe in 10 minute slices or do I risk trying to fix it and possibly kill it in the process? Maybe making a video of the repair attempt would make the risk worthwhile.Anyway, it certainly is a whole lot of scope. Enjoy.

author: elliott
author_rank: Regular Contributor
timestamp: May 14, 2014, 10:45:31 pm
content: Quote from: ecat on February 14, 2013, 04:52:45 pmI know this is an old post, but it may help you if you haven't found a solution already.I have one too, and it behaved just as you describe. I came across this thread which seems to be the solution.http://forum.eserviceinfo.com/viewtopic.php?t=94949&sid=28519523363b0b7d645a878a0cc12898Give IC2020 a poke with your finger near pin 15 and see if you can cause the problem. Mine would do it every time, I bridged 15 and 16 with some solder and haven't had a problem since.Mine also had a problem with the channel 4 button, but that was able to be cleaned. Only problem left is the GND REF cursor, it jumps around randomly and I get "Fail 8" in the self test.
Tektronix 2465B CRT text - Page 1
Forum section: electronics / testgear

author: wallis
author_rank: Contributor
timestamp: May 16, 2014, 05:22:01 am
content: Hello All,Has anybody had this problem with a Tek scope? Scope turns on and does not hang and require A/B trig to be pushed to continue.The problem is you cannot read the readout on the CRT it is there but looks like blurred horizontal lines.Scope has working A5 board and working U800Kind RegardsWalter
Rigol DG1022 versus Siglent SDG1020 - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: May 08, 2014, 10:39:35 am
content: there are tons of threads, posts, but difficult to draw a conclusion. I think the two generators are more or less in the same class. For which one would you note if we assume that both cost the same. (or is that a very wrong assumption?). Would be also nice if you vote, to mention what do you think as being the "highlight" makes you voting for one of them.Thanks a lot!

author: Peter1964
author_rank: Contributor
timestamp: May 14, 2014, 08:54:16 pm
content: They are close to simular as you do mention.I am in the middle of the same struggle and I think I will go for the Rigol.I also need a scope and that will be Rigol DS2072A, so that's why I also choose the Rigol DG1022.

author: daemonix
author_rank: Contributor
timestamp: May 14, 2014, 09:02:33 pm
content: I went with siglent to compliment my new 1074z because it has more bit in both channels and some other better specs.

author: Galaxyrise
author_rank: Frequent Contributor
timestamp: May 14, 2014, 09:11:15 pm
content: I got theSDG1025; I seem to recall the 1020 is different somehow. I can't remember why I decided on the Siglent anymore, but it was similar to Daemonix.But I've hardly ever used it! (unlike my Rigol DS2000 scope, which I've used a lot.) I probably could have bought nothing. Do you know what you want to do with your function generator? Perhaps folks can share how well that works with one or the other.