hybridfree/eevblog-posts huggingface dataset:
Rigol oscilloscope DS1000Z series: software options - Page 1
Forum section: electronics / testgear

author: 84750Erik
author_rank: Contributor
timestamp: December 02, 2018, 07:17:47 am
content: A thread from last year (https://www.eevblog.com/forum/testgear/rigol-ds1000z-now-comes-unlocked/was missed by me, sorry. What I would like to know is:1. How usefull are these options, and for what purposes:a. SD-DS1000Z Serial Decoderb. AT-DS1000Z Advanced Triggerc. MEM-DS1000Z Memory Optiond. REC-DS1000Z Record-Module2. My DS1054Z is hacked to 100MHz and does this well. How will the installation of these options affect or disaffect his hack?Thanks,Erik

author: ataradov
author_rank: Super Contributor
timestamp: December 02, 2018, 07:26:37 am
content: That "hack" is just another option. They are independent from each other. Memory is the most useful one for me personally. But it does not hurt to unlock them all. Advanced trigger is useful too.

author: Fungus
author_rank: Super Contributor
timestamp: December 02, 2018, 09:41:17 am
content: Quote from: 84750Erik on December 02, 2018, 07:17:47 amIt won't make any difference, you'll just get more menu entries and more memory.
Suggestions for camera for AMScope SM-3T Trinocular Stereo Zoom Microscope? - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: June 10, 2018, 07:23:45 pm
content: I recently purchased one of these for SMT work :https://www.amscope.com/7x-45x-trinocular-stereo-zoom-microscope-on-single-arm-boom.htmlI'm now thinking of getting a USB based camera that won't break the bank. Any suggestions?

author: arel
author_rank: Newbie
timestamp: October 01, 2018, 11:41:28 am
content: hiyou can write the developments, what did you do as a result ?

author: Jester
author_rank: Frequent Contributor
timestamp: December 01, 2018, 03:19:28 am
content: Sorry for the out of focus image, I picked this up for cheap ( I paid $99 local pickup). It's not super fast when using USB, but also has HDMI interface that is fast.
questions regarding the batteries in multimeter - Page 1
Forum section: electronics / testgear

author: hussamaldean
author_rank: Unknown
timestamp: December 03, 2018, 12:49:00 pm
content: Hi all,I have couple of stupid questions regarding the multimetersFirst questionin cheap multimeter (in general) 9V battery is used while in professional one such as gossen uses 2X 1.5V, why ?the other onewhy there is no AC current in cheap 5$ multimeter ? only DCI know they sound stupid but I am curious to know why

author: GeoffreyF
author_rank: Regular Contributor
timestamp: December 03, 2018, 12:54:51 pm
content: Cheap multi-meters target infrequent users. 9V batteries run down faster but make other internal circuitry easier. AC Current measurement requires careful design and more expensive construction to be safe.Measuring AC current, even in moderately priced meters requires special precautions such as limiting the time of the test.All features are not equal in cost to implement.

author: HKJ
author_rank: Super Contributor
timestamp: December 03, 2018, 01:01:46 pm
content: 9V batteries are also used in some expensive meters, it is compact and secures a stable voltage to the internal electronic because a voltage regulator is used.With two AA/AAA batteries there is not voltage enough for a regulator and the electronic must work over a wider range of voltage, some chips can easily do that, other cannot.With 3 or more AA/AAA cells there usual is enough voltage for a regulator, but it is not as compact.The meter without AC current will often lack low voltage AC measurement as well, this is because the rectification is a single diode, not a rectification circuit and a single diode has way to large voltage drop to be used for a current shunt.I have tested many multimeters (including tear-down) and also written a few articles about using them, maybe you can find something useful there:https://lygte-info.dk/info/indexDMMReviews%20UK.html

author: Fungus
author_rank: Super Contributor
timestamp: December 03, 2018, 01:11:53 pm
content: Quote from: hussamaldean on December 03, 2018, 12:49:00 pmMakes it cheaper to manufacture.(it's more expensive to use but they don't care about that)Quote from: hussamaldean on December 03, 2018, 12:49:00 pmBecause hardly anybody wants it and they save the cost of a few more components that way.

author: hussamaldean
author_rank: Unknown
timestamp: December 03, 2018, 02:54:20 pm
content: thx for the help not making jocks about my questions
Surplus TE outlet in Queensland? - Page 1
Forum section: electronics / testgear

author: Drewbie
author_rank: Contributor
timestamp: November 26, 2018, 08:33:30 am
content: Hi,Off to the Gold Coast for a family holiday in January.Is there a surplus TE outlet in Brisbane or Gold Coast? Northern NSW?If not, any recommended locations for dumpster diving? :^)

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: November 29, 2018, 06:21:57 am
content: Quote from: Drewbie on November 26, 2018, 08:33:30 amHahaha can I come to. Long drive from melb but hey it’s in a noble pursuits.Sent from my iPhone using Tapatalk

author: Drewbie
author_rank: Contributor
timestamp: November 29, 2018, 11:40:04 pm
content: Anyone that can come up with an wife-acceptable excuse for me to not be stuck in theme parks for 3 days in a row is surely welcome to show up.My fantasy is to be driving along and spot a skip full of tossed-out gear. Heaven.

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: November 30, 2018, 01:28:52 am
content: Quote from: Drewbie on November 29, 2018, 11:40:04 pmMe too just mention "Dreamworld....thunder river rapids ride" Enough to make anyone scared.
Cheap low jitter(<10ps) low speed clock reference recommendation? - Page 1
Forum section: electronics / testgear

author: andylithia
author_rank: Newbie
timestamp: November 20, 2018, 12:36:38 pm
content: Greetings all,Recently, I've got a new task of designing an extremely low jitter pulse generator running at <1MHz speed. A sub-10-picosecond-jitter clock is required. Now the only device I have that can work in such a low jitter is a Tektronix 11801 with 4GHz sampling heads, which is a fragile piece of equipment and quite difficult to use for clock generation (by which I mean using the internal clock outputs as a clock reference).The other clock sources I have are HP8656B and HP3314A. HP8656B has a jitter of over 100ps at a 100MHz output, which is unacceptable. I haven't tested the HP3314A. Since HP didn't even bother listing it in the specifications, I'd assume it's bad.Any recommendation on buying or DIY-ing a low jitter clock?

author: Marco
author_rank: Super Contributor
timestamp: November 20, 2018, 01:07:03 pm
content: Random LVDS oscillator? That requirement isn't exactly stringent.

author: LapTop006
author_rank: Unknown
timestamp: November 21, 2018, 11:43:21 am
content: Quote from: Marco on November 20, 2018, 01:07:03 pmWhich reminds me of one of my current favourite pieces of kit, theStanford Research CG635.Not a pulse generator though.

author: David Hess
author_rank: Super Contributor
timestamp: November 21, 2018, 02:27:02 pm
content: Low jitter goes along with low phase noise so that is where I would start. Take the output from a low phase noise quartz crystal oscillator and *carefully* condition it into a logic level signal.Single ended logic like TTL and CMOS has poor (meaning no) power supply rejection so differential input logic like comparators and some ECL are especially useful in this application. If you must use single ended logic, then the supply voltage and ground must be noise free.

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: November 29, 2018, 10:47:40 pm
content: Are you sure you are talking about hundreds of picoseconds jitter and not hundreds of femtoseconds, andylithia?Second important question is how are you measuring it? RMS or peak-to-peak? And over what frequency interval? Typical measurement is RMS over 12kHz to 20MHz span.I would say that almost any modern TCXO or OCXO has sub-ps jitter in the region of 100fs - 1ps. 100ps jitter sounds awful.If your TCXO/OCXO has only phase noise data, usejitter calculatorto get your jitter estimation.Few examples of current state of the art:run of the mill TCXO -https://www.digikey.co.uk/product-detail/en/ecs-inc/ETXO-H33CL-100.000/XC2134-ND/58755021ps jitter[reasonably expensive] modern 100MHz OCXO -https://abracon.com/Precisiontiming/AOCJY7TQ.pdf20fs jitterLeo
Lcr DE-5000  - Page 1
Forum section: electronics / testgear

author: Andbro
author_rank: Regular Contributor
timestamp: November 29, 2018, 04:56:50 pm
content: Hi,What do thing about this LCR METER, DE-5000?

author: Mr. Scram
author_rank: Super Contributor
timestamp: November 29, 2018, 05:18:39 pm
content: Quote from: Andbro on November 29, 2018, 04:56:50 pmWhat's your question exactly? It's a good LCR meter and quite popular here. The only slight issue some people seem to have with it is that its inputs aren't protected. If you hook up a charged capacitor, you may damage the meter.

author: kripton2035
author_rank: Super Contributor
timestamp: November 29, 2018, 06:20:00 pm
content: it is a very good lcr meter, it's hard to find a better bang for buck than this one.you need $1k+ to have some really better instrument.

author: Andbro
author_rank: Regular Contributor
timestamp: November 29, 2018, 07:04:44 pm
content: HiYou have exactly answer to my interrogations.Thanks

author: coppercone2
author_rank: Super Contributor
timestamp: November 29, 2018, 08:23:31 pm
content: their called questions, interrogations sounds completely bizzare like your a copbut I own a de-5000 and its a really good bargin because all the real LCR meters are usually really expensive. Good enough for protection filters and stuff. I don't know if its the right tool for prototyping high order higher frequency L filters but for typical lab stuff its great.

author: bugi
author_rank: Regular Contributor
timestamp: November 29, 2018, 09:57:10 pm
content: There are already few threads about the same thing, opinions on DE-5000 (and other choices), like:https://www.eevblog.com/forum/testgear/low-cost-cap-tester-esr-lcr-2018/https://www.eevblog.com/forum/testgear/recommendation-on-a-decent-lcr-meter/And then a big thread about it specifically:https://www.eevblog.com/forum/testgear/der-ee-de-5000-unboxing-and-teardown/There are more, revealed with the search box in the upper right, type in "DE-5000" and reserve some time for reading.
A tool for designing arbitrary waveforms - Page 1
Forum section: electronics / testgear

author: Warhawk
author_rank: Frequent Contributor
timestamp: November 29, 2018, 01:34:55 pm
content: Hi guys,I am looking for a software which would help me with designing arbitrary waveforms for my AWG from Rigol (dg1022u). I know that Rigol has the UltraWave package but I could not get this bloody tool running. Neither under wine, nor in Windows 7. It just reports some exception handler and crashes. Does anyone have a tip for software which allows graphically drawing different waveforms and exporting them into some readable format? If it ran in Linux, it would be brilliant.I googled but probably could not figure out the right magic formula.Thanks, Jiri

author: joeqsmith
author_rank: Super Contributor
timestamp: November 29, 2018, 01:37:40 pm
content: Matlab? Excel? I use LabVIEW myself. I'm sure there are a few choices out there.

author: Warhawk
author_rank: Frequent Contributor
timestamp: November 29, 2018, 02:59:43 pm
content: Matlab, Excel, they don't allow for drawing the waveform by hand. I wanted to avoid putting there numbers manually.

author: djnz
author_rank: Regular Contributor
timestamp: November 29, 2018, 03:39:00 pm
content: Perhaps this will interest you:https://markummitchell.github.io/engauge-digitizer/

author: joeqsmith
author_rank: Super Contributor
timestamp: November 29, 2018, 06:07:40 pm
content: Maybe write the equations to derive the waveform? I've used various equipment to record various waveforms that I wanted to playback.Drawing the wave shouldn't be too bad. Maybe just use a standard CAD package. Save the files in a standard format and write a conversion. Back in the stone ages, I did something similar. Built a custom Arb and used a hand scanner to capture a waveform and then converted it.

author: JDubU
author_rank: Frequent Contributor
timestamp: November 29, 2018, 08:54:20 pm
content: Siglent's Easywave software saves to a CSV file:https://www.youtube.com/watch?time_continue=5&v=BPa_eoxWIDAhttps://www.siglentamerica.com/service-and-support/firmware-software/waveform-generators/

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: November 29, 2018, 09:55:21 pm
content: You could even do it in Excel, if you define a Baseline (or do it inverted), mark the cell corresponding to the amplitude with something and then write a macro giving you the non-empty cell for all consecutive columns.Then normalize/convert to format used by generator.(not a recommendation, but feasible nearly everywhere)
Tektronix TekProbe ADA400A to Agilent AutoProbe mod - Page 1
Forum section: electronics / testgear

author: Someone
author_rank: Super Contributor
timestamp: March 05, 2015, 11:08:16 am
content: I've a DSO-X 3000 that I use for day to day work which has the advantage of an active probing interface, which Agilent called AutoProbe. While great for current clamps and the Agilent active probes they lack a low noise differential probe in their catalogue which is where the Tektronix ADA400A comes in. Having used one before I was happy with the performance but had not realised how cheap they have become since the TekProbe interface is getting rather historic and not directly supported by any recent scopes. The great news is the bottom of the connector case is a surprisingly accurate match for the alignment of the Agilent Autoprobe lands on the front of their current model scopes, which leads to this mod.Around the cable and connector are a clamshell 2 piece case that is held in the classical way with moulded plastic clips, in a tough and resilient plastic so no fears of snapping any of this when disassembling. The TekProbe pogo pins are held in place by friction only and can be slid out without drama to leave the ring clear of connections. A small scrap of double sided PCB was shaped to snugly fit the AutoProbe aperture and the old pogo pins reused to make the new connections, +/- 12V and +5V were wired through the original cable by terminating into the pads that the pogo pins sat on originally. Pinouts for the interfaces can be found in US patents 6385550 and 5939875.The DSO-X 3000 powers the Autoprobe interface without any handshake, and will shut down automatically if there is an overload, helpfully asking you to remove excess probes to continue.Performance, 1.2MHz -3dB point at full bandwidth (slew limited) with less than 8uV RMS of noise. Adding in the 100Hz low pass filter, less than 3uV RMS.

author: Wolfgang
author_rank: Super Contributor
timestamp: November 29, 2018, 08:39:41 pm
content: Hi,I have made a probe adapter to attch your own probes to a Keysight scope with Autoprobe sockets.Look here:https://electronicprojectsforfun.wordpress.com/using-the-keysight-autoprobe-interface-in-your-own-projects/
GW Instek GDS-2000E series bugs and other issues list - Page 1
Forum section: electronics / testgear

author: rhb
author_rank: Super Contributor
timestamp: November 29, 2018, 02:28:25 pm
content: The purpose of this thread is to document bugs in the FW on the various versions, the GDS, MDO and MSO.I am primarily using an MSO-2204EA for this, but have a GDS-2072E available also.Good Will are remarkably diligent in addressing problems. So I'm reserving space at the start of the thread to make it easy to keep track of what's been fixed and what has not. I am documenting issues with screen dumps and will be adding images as they are found and removing them as they are fixed. The original report will still have the screen dump, but the summary will only show outstanding issues.Hopefully this will prove helpful to both owners and GW.

author: rhb
author_rank: Super Contributor
timestamp: November 29, 2018, 02:29:38 pm
content: Switching from 100 nS to 50 nS/div turns off and disables digital filtering.Enabling zoom turns off digital filtering even on a stopped trace.https://www.eevblog.com/forum/testgear/gw-instek-gds-2000e-series-bugs-and-other-issues-list/msg2000228/#msg2000228

author: rhb
author_rank: Super Contributor
timestamp: November 29, 2018, 02:31:22 pm
content: Reserved

author: rhb
author_rank: Super Contributor
timestamp: November 29, 2018, 02:31:57 pm
content: Reserved

author: rhb
author_rank: Super Contributor
timestamp: November 29, 2018, 02:33:02 pm
content: Reserved

author: rhb
author_rank: Super Contributor
timestamp: November 29, 2018, 03:07:47 pm
content: Issue: Digital filtering is switched off by setting a sweep faster than 100 nS/div.Instrument: MSO-2204EAFW: 1.37The 3 screen dumps show the filter working. I then switched to 50 nS/div and back to 100 nS/div.The input is a 36 pS measured rise time pulser from Leo Bodnar with a 50 ohm through termination. Leo specifies them as 40 pS, but provides a scope printout showing the actual measured step response.I had thought for a long time that it simply did not work and only discovered the true issue by accident.The "feature" makes it difficult to examine steep transitions for ringing due to mismatches. The measurement function does a reasonable job of measuring the overshoot and rise time, but you cannot see the actual waveform. Enabling zoom also turns off the filter even if you have stopped the sweep. However, it does save the filtered waveform correctly. So to view the filtered trace it must be transferred to a PC and plotted.Edit: This will not be fixed. GW says it's a limitation of interpolation, but even in dot mode the problem persists. And there is no reason not to filter a stopped trace. So it's a marketing check box item rather than an engineering tool.
TEI, Calrad, or Olsen Transistor Checker - I need manual and schematic - Page 1
Forum section: electronics / testgear

author: timshoe
author_rank: Newbie
timestamp: November 27, 2018, 04:19:57 am
content: I just got a little transistor checker made by TEI model 19-4. It seems to basically work, but I need a manual and a schematic would be nice also. It was sold back in the 70s by Calrad (model TRT) and Olsen (model te-195). I searched the web and found several pictures, but no manual or schematic.If anyone has info on this tester, I would be very grateful.Attached is a picture of the Calrad version.Thank you
Deek-Robot MiNi DC Power  - Page 1
Forum section: electronics / testgear

author: Pluscrafter
author_rank: Regular Contributor
timestamp: November 30, 2018, 06:03:24 pm
content: Has anybody experience with the Deek-Robot MiNi DC Power? And how it will behave on a short circuit?

author: Fungus
author_rank: Super Contributor
timestamp: November 30, 2018, 06:17:19 pm
content: No idea, but the Deek web page says: "max. 2A loadwith short circuit protection."http://www.deek-robot.com/productShow.asp?id=18

author: tsman
author_rank: Frequent Contributor
timestamp: December 01, 2018, 12:50:41 am
content: There is a comprehensive review athttps://www.voltlog.com/voltlog-120-mini-dc-power-supply-review/Good points are that it is quite compact, nice looking case and capable of the rated output. Bad points are that the output is quite noisy, no accessible current limit adjustment, silk screen is wrong and they've made a mistake during construction of that unit which means the 5V output current reading is 1/10th the actual value.The XLSEMI XL4005 is what is providing the short circuit protection so dig into the datasheet for that if you need more information.If you can get a correctly assembled one and it is cheap then probably okay for basic usage but beware that noisy output.
Keithley 2306 dual battery simulator output when off - Page 1
Forum section: electronics / testgear

author: cmjones01
author_rank: Contributor
timestamp: November 26, 2018, 03:26:29 pm
content: All,I'm posting here because I notice there's been some discussion about the Keithley 2306 on here before, so I'm hoping someone has more expertise and experience with the unit than I do.I've had one on the shelf for a while which seemed to be behaving oddly: When the output was supposed to be OFF on either channel 1 or 2, it would wander up to some random value via a high impedance. Measuring it with a 10Mohm meter showed about 9.5V, and the power supply's internal meter showed the same value. When the output was ON, it worked OK, but the 'leakage' when off was annoying and confusing.Today I went digging around inside it hoping to find a leaky MOSFET or similar, but found something much more odd. Each output is switched by a pair of back-to-back IRFZ44N MOSFETs. They were blameless in this case.The culprit turned out to be a couple of 1MOhm resistors, R673 and R679 on the bottom of analogue PCB, which are connected between each output's + terminal and an internal +18V-ish rail! Why on earth would they do that? I've moved the resistors aside for now and everything works the way I'd expect.Have I just done an ill-advised mod? Anyone else got one of these machines and can tell me whether the output drifts high when it's supposed to be off? If it does and it annoys you, now you know how to fix it...ThanksChris

author: alm
author_rank: Super Contributor
timestamp: November 26, 2018, 07:59:11 pm
content: Nope, can't reproduce this. With power-on defaults, except both channels set to +10V and outputs disabled, channel #1 (with +/- sense connected to one of the + and - terminals, respectively) outputs 0.020 V (according to internal meter) with no DMM connected, dropping to 0.013 V with a 10 MOhm DMM across the output. Channel #2 (with sense terminals open) reads 0.001V on the internal DMM, and fluctuates with a few mV with a 10 MOhm connected across the output terminals.

author: cmjones01
author_rank: Contributor
timestamp: November 26, 2018, 08:43:47 pm
content: Thank you for checking. Your findings confirm the way I thought it should work. I wonder if my unit has a -ve rail missing somewhere. There are four 1MOhm resistors visible on the underside of the board. Two of them definitely pull the outputs up (I can see continuity from one end of the resistor to the + output, and from the other end to the output of an LM317 regulator set to 18.8V) but I didn't check the others. Maybe they should be pulling equally hard in the other direction, but they're not.Well, it seems to be working fine for now. Maybe I'll discover some fatal flaw with my mod later on when I use the 2306 in earnest.Here's a movie of it in use to run the external calibration procedure on my Tektronix 2430A scope.Chris
Emerson / rosemount 375 battery charger pinouts - Page 1
Forum section: electronics / testgear

author: PTR_1275
author_rank: Frequent Contributor
timestamp: November 26, 2018, 02:26:51 pm
content: Hi everyone,Wasn’t sure if this should go in repair or test equipment. Kinda fits in either category.I bought a Emerson 375 Fieldbus communicator with no charger and I’m trying to get any information about the charger pinouts.The pcb on the battery pack has a large potted section for Atex compliance, so I can’t trace down the pcb as much as I’d like. I’m also pretty sure the charger is just a power supply and the charging side of things is handled within the battery pack.If someone has one of these that they can take some measurements on, that would be great.The replacement chargers are around $600 from what I could find, hence asking here.Thanks
Kontron DMM 4021 - potentialy a Tabor DMM 4021 - Page 1
Forum section: electronics / testgear

author: dk_wiking
author_rank: Newbie
timestamp: November 26, 2018, 12:23:08 pm
content: HiI bought a cheap Kontron bench meter on ebay. The model DMM4021 and I would like to get a link to a manual and potentialy also a link to the service manual. Does anybody have a link?BR Kim
Free Wavetek 178 GPIB control program. - Page 1
Forum section: electronics / testgear

author: lmester
author_rank: Regular Contributor
timestamp: November 25, 2018, 04:08:25 am
content: This program allows you to control the instrument and also to save and load configuration files.This is a Windows program and requires a Prologix or Prologix compatible GPIB-USB adapter.If you have a Wavetek 178 programmable waveform synthesizer you already know that the user interface is not the best. Also, after about 30 years, the metal dome type pushbutton switches are intermittent, bouncy and nearly unusable.I've dealt with these switches on other equipment. I didn't waste my time trying to clean them. You spend hours cleaning the switches and six months later they're getting bad again.This software has been tested with a Prologix adapter and with Emanuele Girlando's Arduino based adapter.Emanuele's GPIB adapter is the least expensive way that I've found to to get your GPIB instrument connected to your computer. You only need an Arduino nano and a 24 pin Centronics connector. The connector was more expensive than the cheap Arduino nano clone that I used! The total cost was less than $5!More info on Emanuele's GPIB adapter:http://egirland.blogspot.com/2014/03/arduino-uno-as-usb-to-gpib-controller.htmlIt'll be interesting to see if I get any downloads of this software. I expect that this huge boat anchor Wavetek is not a very popular instrument.Here is a link where you can get more info and download the program:https://mesterhome.com/gpibsw/Wave178/index.html

author: mk_
author_rank: Regular Contributor
timestamp: November 25, 2018, 09:01:53 pm
content: Quote from: lmester on November 25, 2018, 04:08:25 amYes, a nice waveformsynthesizer with a huge outputvoltage, IIRC+/-10V into 50Ohm with a unusable keyboard...if the 178 is willing to boot after 4 unused years I`ll try it during the next weeks
R3131 total gain failure - more theory please - Page 1
Forum section: electronics / testgear

author: stantelson
author_rank: Newbie
timestamp: November 06, 2018, 03:47:33 pm
content: Two R3131 self-test failures - First - CPU - easily fixed with new 3.6V RTC battery and reset button, with great info already in this forum. Second failure - I then have a self-test "total gain" failure. Same failure when cold and after 30 minute+ warm-up. From postings I have already found, suggested to replace R120 in output stage of RF board from 390 to 470 ohms. Other suggestion, to replace 4072 opamps (posting said two, but there are three on the IF board near output connector). Haven't started either of these - would like more confidence that either change makes sense. Thoughts? Thanks.

author: stantelson
author_rank: Newbie
timestamp: November 26, 2018, 02:11:31 am
content: as an update, I replaced the 390 ohm R120 with a very small 1K pot and determined Total Gain passed in the range of about 430 to 800 ohms. Planning to replace R120 with an 0805 680 ohm R. Stil curious why this failure is occurring - anyone know root cause of the gain drift?
Adjust frequency reference in Siglent SDS-1202x-e and Feeltech Fy6800 to GPSDO - Page 1
Forum section: electronics / testgear

author: Saddle
author_rank: Newbie
timestamp: November 24, 2018, 07:50:28 pm
content: I recently purchased a GPSDO and I would like to adjust the internal frequency reference of my Sliglent SDS-1202x-e to the GPSDO. I cannot find any reference to this in the manual, or on the web to do this.I want to do the same for my Feeltech FY6800. Has anyone been able to do this?Thanks

author: tautech
author_rank: Super Contributor
timestamp: November 24, 2018, 08:58:59 pm
content: Welcome to the forum.Most entry level equipment don't provide for a external 10 MHz reference input.SDS1202X-E timebase accuracy is specified @+25 ppm ......Maybe it can be kept at tight tolerances by regular calibration.Service manual:https://www.siglentamerica.com/download/6149/
DS1054Z UK price - Page 1
Forum section: electronics / testgear

author: Buriedcode
author_rank: Super Contributor
timestamp: November 24, 2018, 08:29:41 pm
content: So, its about time I picked one of these up, since my 50MHz analogue scope is as old as I am, and is starting to be pretty limiting. I have seen the thread where a company gave out discount codes, so I thought I might as well ask here - has anyone seen a good deal on the DS1054Z in the UK?On Rigol's site its about £370 inc. VAT with software upgrades and probes. This seems to be about the same price everywhere else, but I thought it can't hurt to post in case someone has seen a good deal anywhere else.Cheers!
Marconi 6960 cable pinout? - Page 1
Forum section: electronics / testgear

author: dmills
author_rank: Super Contributor
timestamp: May 02, 2017, 11:23:31 pm
content: Does anyone have the pinout for a Marconi 6960 power meter sensor cable, I managed to get the meter and a power head that allegedly works (We will see), but no cable and the information is surprisingly hard to find.I am pretty sure the connector is a Binder M16, 12 pin job, but what is the wiring, 1:1 or something else?Regards, Dan.

author: pe1oxp
author_rank: Regular Contributor
timestamp: May 03, 2017, 06:04:04 am
content: I made my own cable years ago from an HDMI cable, its 1:1 (VGA cable will also be suitableSee for example the manual of the 6910 sensor,https://doc.xdevs.com/doc/Marconi/MARCONI%206910%20Instruction.pdf

author: dmills
author_rank: Super Contributor
timestamp: May 03, 2017, 12:14:48 pm
content: Great, thanks.The connectors cost more then the instrument did....Regards, Dan.

author: testpoint
author_rank: Regular Contributor
timestamp: November 24, 2018, 01:12:23 am
content: checked the schematic with agilent 8481a, only one pin (head select exists in marconi, agilent has no) is different, so, you may modify the pinout then plug into agilent 437B.
Hantek DSO5202P no wave is showing on display after powering up - Page 1
Forum section: electronics / testgear

author: dichar
author_rank: Newbie
timestamp: November 23, 2018, 09:30:44 pm
content: Hi guys;It is a while now sinds I have this problem with my DSO5202P. Purchased 4 years ago, not even booted 80 times and then it does not want to show the wave on the display after powering up.Many time I ve tried to get help from the company, but without hope. I have found this forum and I saw many simillar problems, but no case has helped me with solving my problem.Both probes are tested, but with the same issue.I ve tried to calibrate the probles, while doing that after step 2 it stops with an error 0x00.Then I ve tried to update the firmware downloaded from Hantek site. After formating the USB 32FAT and trying to begin the update. After 3 seconds it stops with generating an error 0xFE.Please wach the problem I m dealing with on the next link:https://www.dropbox.com/s/biw4em3hhyisngm/No%20wave%20form.mp4?dl=0I ve tried to

author: nctnico
author_rank: Super Contributor
timestamp: November 23, 2018, 09:42:08 pm
content: If the 'default' button and 'autoset' don't do the job then I'd suspect the oscilloscope is broken. 9 out of 10 times people forget (or fail) to set the triggering which results in similar behaviour. As a last resort you can try to set the trigger to 'auto' but if that is not resulting in showing a signal then I fear the worst.
great scope probe and accessory - Page 1
Forum section: electronics / testgear

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 24, 2018, 01:58:15 am
content: Recently the HP miniature scope probe was mentioned here and I remembered the little probes that came with my HP1741.Naturally they broke years ago but I lucked into a NOS probe on eBay.I never saw the DIP gripper accessory for these things and wow is it ever great!Why isn't this more common? You can just grip this thing on a DIP chip and it stays there!I mean sure, who uses DIP anymore, but it's still useful.

author: joeqsmith
author_rank: Super Contributor
timestamp: November 24, 2018, 02:37:14 am
content: That's pretty slick. I've never seen one. I would normally use the chip clips, even as we moved to higher density packages.
Anristu MG3633A Service Manual? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: November 19, 2018, 04:56:08 pm
content: Has ayone got hard or soft copy of the service manual for the Anritsu MG3633A? I know ArtekManuals has the MG3632A but I suspect that's a whole different animal.ThanksDavid

author: nonlinear
author_rank: Contributor
timestamp: November 25, 2018, 04:40:16 pm
content: What happened with it?Sweetest problem of MG3633A is thermo fuse open caused by fan fail and subsequent overheat.

author: DC1MC
author_rank: Super Contributor
timestamp: November 25, 2018, 06:35:37 pm
content: Quote from: perdrix on November 19, 2018, 04:56:08 pmI can only point you to our resident Anritsu expert, @captBullsot:https://wunderkis.de/mg3633a/You'll find there everything you need for your device.Cheers,DC1MC

author: capt bullshot
author_rank: Super Contributor
timestamp: November 25, 2018, 06:36:36 pm
content: Have look here, scroll down to manuals:http://wunderkis.de/mg3633a/

author: capt bullshot
author_rank: Super Contributor
timestamp: November 25, 2018, 06:37:14 pm
content: Quote from: DC1MC on November 25, 2018, 06:35:37 pmYou were faster, congrats

author: DC1MC
author_rank: Super Contributor
timestamp: November 25, 2018, 06:41:18 pm
content: Hey capt, did you schedule already this year visit to Mr. Head, one more place left ,) ?!?!?Cheers,DC1MC

author: capt bullshot
author_rank: Super Contributor
timestamp: November 25, 2018, 07:01:51 pm
content: Quote from: DC1MC on November 25, 2018, 06:41:18 pmNo, no more visits to Mr. Button (not Head) this year. Next year, who knows? Waiting for something interesting to pop up.BTW, got another boat anchor from the evil bay (this one's even heavier than the MG3633's):https://cb.wunderkis.de/wk/AC-Source-EAC/teardown/I'm working on it, apparently its main brains got lost, but everything is controllable by some switches and pots, so no CPU required.
What is This Connector in Lecroy D500PT Probe Tip? - Page 1
Forum section: electronics / testgear

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 22, 2018, 05:16:27 am
content: i bought used Lecroy WL600 Active Differential Probe with 6GHz D500PT Head sold as is but claimed to be working. The head's tip is connected through this female connector (attached picture on right side) as you can see one of its 4 internal ring (female center pin) is broken i think i need to find replacement in case this probe's tip is non functional due to this, still waiting the matching oscilloscope to be delivered so in the mean time i have no way to test the connectivity. does anyone know what connector type or name for this? i've included the dimension in case someone knows all possibilities for this mini coax connector type (2mm outer (gnd) ring diameter with excess or protrusion 2.2mm diameter on the end). i googled IPX, U.FL, MMCX and CRC9 but they dont quite match the shape of this connector (with internal female ring spliited into 4) and larger diameter on the end of outer ring. i have male CRC9 i tried to push it in, it can go in but with a little bit force i'm afraid with many times of usage, it may damage the internal and the outer ring as well which is also splitted into 4. anyone?

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 22, 2018, 06:45:09 am
content: well its another blind mate connector, its SMP connector... problem solved.

author: lukier
author_rank: Unknown
timestamp: November 22, 2018, 07:20:53 am
content: Try SMPM, like 925-127P-51P from Amphenol.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 22, 2018, 07:43:14 am
content: yes i think SMPM is more acurately as just now i checked SMP dimension is 3+ mm diameter instead of my measured 2mm something. SMPM is the exact dimension. thanks.
Hantek DSO5102P sampling frequention - Page 1
Forum section: electronics / testgear

author: markv6
author_rank: Newbie
timestamp: November 23, 2018, 01:58:02 pm
content: My processor generates a burst of 10khz. When measuring this pulse with the DSO5102 it shows a low frequency random pulse. After a hour searching why outputting a simple pwm does not work see here:Problem is the sample frequency of the scope is exactly my pwm frequency so it does not show the pulse. Changing the timebase:When changing the pwm frequency to 21khz the picture is as aspected:I have used serval digital scopes, Agilent Tektronix Rigol but never had this problem. It is worthless if you cannot thrust what you see.

author: tautech
author_rank: Super Contributor
timestamp: November 23, 2018, 06:54:24 pm
content: Try adjusting trigger holdoff to 20+ ms.

author: paul
author_rank: Contributor
timestamp: November 23, 2018, 08:55:20 pm
content: This is normal, I have fallen into the same trap with a Tektronix scope.Use the Peak mode on the Acquire menu, this will increase the sample rate and catch a lot of the higher frequency stuff / glitches you just cant see in the “Normal” acquire mode, or up the memory depth (this doesn’t always increase the sample rate and can slow the scope down a bit).Paul.
Rigol DG1022Z Teardown - Page 1
Forum section: electronics / testgear

author: LeoIt
author_rank: Newbie
timestamp: September 10, 2017, 11:21:35 pm
content: I would like to open a Rigol DG1022Z, but I can't, I feel so stupid to ask how to open it but I don't know how to take the cover a part.I taked out all the bumpers, I didn't find any other screws around the cover, I tried to slide the cover but it soesn't move at all, tried to take out the front panel but nohing moves....Any help would be very appreciated.

author: bd139
author_rank: Super Contributor
timestamp: September 11, 2017, 10:33:19 am
content: I've got one but I'm not opening it

author: LeoIt
author_rank: Newbie
timestamp: September 12, 2017, 07:16:04 pm
content: My be, if someone will give me some suggestions, one day I can open it and I can discover that it can be torned into a 60MHz ... In that case I will post How to do it and probably You will decide to open it

author: bd139
author_rank: Super Contributor
timestamp: September 12, 2017, 08:27:14 pm
content: I'm quite happy with 25MHz at the moment but a free 60MHz would be nice.When the warranty is up I will crack mine open. Only bought it four weeks ago though.

author: Circlotron
author_rank: Super Contributor
timestamp: November 22, 2018, 03:37:17 am
content: So, has anyone actually done a teardown of one of these? Most interested to see.

author: xrunner
author_rank: Super Contributor
timestamp: November 22, 2018, 03:47:03 am
content: Quote from: LeoIt on September 10, 2017, 11:21:35 pmI had one at one time. There are two screws in the back can you not find them?

author: MrFox
author_rank: Contributor
timestamp: November 22, 2018, 04:52:14 am
content: You need to remove the tilting handle. Rotate it 270 degrees until it's vertical above the unit. There's a notch allowing to pull the handle out.The only other things to remove are the back bumpers and the two small screws underside towards the back. No need to remove the front bumpers.
HP 54520A (and 54522A, 54540A, 54542A) leaking lithium battery warning - Page 1
Forum section: electronics / testgear

author: 1980s_john
author_rank: Contributor
timestamp: March 08, 2017, 10:28:17 pm
content: Hi,I recently bought a faulty HP 54520A scope, the screen came on with a button-down power up so it has the same flat lithium battery problem as any of these similar 1990s HP scopes. I disassembled the scope using the excellent guide here:http://codeterrific.com/electronics/hp-54520a-oscilloscope-fix/A few points to note, I found a 16mm open spanner ideal for removing the front and rear BNC sockets. My unit had a slightly different number of screws than noted above (eg had to remove the four top lid screws that would be used to attach the accessories bag), and also note need to remove coax connector to front panel calibrator output. My unit was not quite as grubby as shown but it was fairly full of dust bunnies; I need to sweep it out and the take the PSU apart and video board out the dust them too. All the caps look good but I will check these for high ESR just in case.Having removed the main board I see the battery has a date code of 95-07, so 21 years old. I was surprised to see that the lithium battery had leaked some white powder, I haven't yet removed the battery but hope this will come off the PCB with IPA. It doesn't seem to have rotted any traces thankfully.Lastly the battery type - it is roughly 47mm long 3V lithium, size is CR17450. It is fitted with PCB tabs, two pins on + end and one pin on - end. I see these are readily available from Panasonic (BR-A) and others. Do not buy AA size as these are too long.Next job is to order a battery and fit it.My warning is to anyone who has one of these scopes and hasn't replaced the battery to check the state of it now.Regards,John

author: SingedFingers
author_rank: Frequent Contributor
timestamp: March 09, 2017, 10:34:18 am
content: Thanks for the heads up. I'm in the market for one of these at the moment so a good one to watch out for. I'd probably replace that battery straight up based on this.

author: 1980s_john
author_rank: Contributor
timestamp: November 21, 2018, 06:31:40 pm
content: Just to confirm the fix worked fine. The website referred to is 404 but thankfully is on the internet archive:https://web.archive.org/web/20161021210626/http://codeterrific.com/electronics/hp-54520a-oscilloscope-fix/Regards,John
TDS3000 aborted FW update - help !! - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: November 20, 2018, 05:11:09 pm
content: Just started to update a TDS3054B from 3.36 to 3.41, and at disk 4, it looks like the drive failed... I think the upper read head hangs down (I can't even get the floppy out !), and it refuses to read any data from disk 4.Now it's switched on and runs... but I won't be able to replace the drive (I've got some spare) while the beast is running... anyone knows whether I can safely shutdown "in the middle" of a FW upgrade ?(huh... writing the question alone somehow brings bad feelings...)Is there any command(s) I could send via network ? (although I've no clue whether network is configured and there's no way to get out of the FW update screen...)Any ideas, suggestions;-

author: darkstar49
author_rank: Frequent Contributor
timestamp: November 21, 2018, 03:51:19 pm
content: well... I saved my day by doing what I probably shouldn't have been doing... change the drive while the scope was online...but I'd have hated to have a bricked TDS3054B because of floppy drive failure just at the last disk...
A Fluke 289 multimeter boot failed - Page 1
Forum section: electronics / testgear

author: qiran
author_rank: Newbie
timestamp: November 11, 2018, 11:07:43 am
content: Hi all,I have a Fluke 289 multimeter. I found it can not boot successfully today. When I install the battery case, the indicator under power key will flash some times, after about tens of seconds, the screen will display: "CAUTION, Critical FLASH memory error. Return meter to Fluke Service Center."It looks like the firmware is lost.Has anyone met the same issue? or do you have any idea about this issue?

author: JeffreyLatter
author_rank: Contributor
timestamp: November 11, 2018, 06:22:54 pm
content: Sorry, haven't seen this issue.I own one myself and at work, we have alot of 287 + 289's, but none have ever show this error.

author: JFJ
author_rank: Regular Contributor
timestamp: November 11, 2018, 09:12:25 pm
content: The Fluke 289 does have a limited lifetime warranty. So, Fluke may repair it free of charge.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 12, 2018, 12:38:04 am
content: Quote from: JFJ on November 11, 2018, 09:12:25 pm+1 call or send an email to Fluke first, dont open it until you have an response from them ...

author: darkstar49
author_rank: Frequent Contributor
timestamp: November 12, 2018, 09:53:53 am
content: Quote from: JFJ on November 11, 2018, 09:12:25 pmThey will !! I did the mistake a few years ago to attempt a repair on a 289, thinking there was no applicable warranty (I bought it on eBay, and it was at least 5-6 years old, had no invoice,...), but after some mails and a phone call, that appeared to have been a huge mistake...Fluke stands to their products, and the 289, definitely for this type of issues, has a lifetime warranty.

author: qiran
author_rank: Newbie
timestamp: November 21, 2018, 12:10:12 pm
content: Thank you all.According to your recommendation, I sent the meter to the local Fluke service center. After 1 week later, I received the meter that has been repaired and calibrated. The repaire is free.

author: Terry01
author_rank: Frequent Contributor
timestamp: November 21, 2018, 02:56:22 pm
content: Nice 1!
Gossen Konstanter 2 T1 K 20 B 0.5 teardown - Page 1
Forum section: electronics / testgear

author: Nauris
author_rank: Regular Contributor
timestamp: November 20, 2018, 08:10:26 pm
content: My old power supply got pretty much tied up powering a motor in the workshop, so I needed a new one for my lab.Come to realize all good new ones were sort of pricey, but then I found this one on Ebay.de with just 20 mins remaining.Ended up with 36€ + 16€ postage.A Gossen Konstanter 2 T1 K 20 B 0.520V 0.5 A and dual output, that is very much appreciated feature.And it works! Meters are pretty much spot on. 2nd channel potentiometer is a bit jumpy, but I hope it is just because of lack of use.Not too much components in there.Pass transistors are 2N3055, like you could find in a nowadays power supply.Green transistors! (BC251)There is even an integrated circuits in it, LM304 made by SG in 1975 and 1972. Newer one looks bent, maybe someone has replaced it?So that makes it about 45 years old. Even the capacitors are apparently good, as it does not show noticeable ripple. Output tends to drift sometens of millivolts with time thought.

author: threephase
author_rank: Regular Contributor
timestamp: November 20, 2018, 09:18:01 pm
content: Nice find, totally different to what they make these days.Kind regards.
HP 1976 shadow box art, HP 5000a LSA - Page 1
Forum section: electronics / testgear

author: mattil3
author_rank: Newbie
timestamp: November 17, 2018, 04:19:41 am
content: Hello,I found an interesting piece of Hewlett Packard art from 1976. It seems related to the 5000a LSA, but I am not sure of much more.I was wondering if anyone had any additional information on this.Thanks

author: Drewbie
author_rank: Contributor
timestamp: November 19, 2018, 12:29:51 pm
content: Nice.I'm guessing (completely) that it's some sort of in-house art signifying important HP events during 1976 and that a number of them were made for display in the reception area of all HP offices worldwide.Not sure why the 5000a is shown - that was released in 1973 and they had better gear out by 1976.Circular unit on the RHS looks like part of the 11602B transistor fixture for a 8745A S-parameter test set.

author: Ranayna
author_rank: Super Contributor
timestamp: November 19, 2018, 08:53:47 pm
content: I love the universal screwing at the bottom :p

author: mattil3
author_rank: Newbie
timestamp: November 21, 2018, 02:55:02 pm
content: Thanks for the info regarding the transistor fixture
Ebay banana sockets and plugs - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: November 21, 2018, 04:27:25 am
content: Hi!Is Ebay banana sockets and plugs are usable?What types is ok?Thanx

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 21, 2018, 10:39:39 am
content: For what purpose?

author: rsjsouza
author_rank: Super Contributor
timestamp: November 21, 2018, 12:08:31 pm
content: Excellent eBay source of quality products, including several types of banana jacks and plugs:https://www.ebay.com/str/99centhobbiesThis store is from a regular here (Franky):