hybridfree/eevblog-posts huggingface dataset:
New/used Fluke 189 11  - numbers bouncing around when I turn it on - Page 1
Forum section: electronics / testgear

author: bc888
author_rank: Regular Contributor
timestamp: September 04, 2018, 12:22:55 pm
content: Hi all:New to the game, I could have put this in "total" noobie beginner section" as well because that's what I am but figured this was a better location. I bought a used Fluke 189 (2) online that was "in good working condition". $199 seemed fair yet when I turn it on the numbers bounce around no matter what function I set it at. I did a search on eevblog and didn't see an answer and fruitlessly perused the online manual. Is there an easy fix for this or am I missing something and this is normal behavior? I've taken the batteries out for 24 hours and will reinstall them tonight to see if that will do anything. The thing otherwise looks perfect - still has the plastic film over the plastic viewing window.In case this post elicits a "just buy one of Daves Eevblog BM235's, I already did that as well. Should I send the Fluke back to the seller?

author: tooki
author_rank: Super Contributor
timestamp: September 04, 2018, 12:31:15 pm
content: Does it show a correct value when actually measuring something?

author: mzacharias
author_rank: Frequent Contributor
timestamp: September 04, 2018, 01:00:28 pm
content: Quote from: bc888 on September 04, 2018, 12:22:55 pmIt's quite normal for the digits to wander around a bit, especially if the test leads are connected to the meter but just laying out there unconnected to any circuit.They pick up all sorts of noise, especially on AC volts and milli-volts function.If this behavior mostly goes away when you short the leads, and if normal measurements work correctly, the meter is probably working exactly as intended.Here is a link to the 189 owners manual.https://assets.fluke.com/manuals/187_189_umeng0200.pdf

author: bc888
author_rank: Regular Contributor
timestamp: September 04, 2018, 02:19:43 pm
content: I'll try to measure a battery when I get home tonight and see if it settles down. I believe I'd put it on continuity and touched the probe tips and the numbers still were dancing around.

author: bc888
author_rank: Regular Contributor
timestamp: September 05, 2018, 12:38:29 am
content: Came home, stuffed the batteries back in, seems to work fine. (normal). Thanks!
Type of input connectors on a Lecroy DDA-5005A scope? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: August 15, 2018, 08:26:36 pm
content: Does anyone know what type of RF connector this is? The manual was useless... Ideally, I'd like to go from this to a female BNC.Thanks.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 15, 2018, 08:41:21 pm
content: you have lecroy prolink adapters to convert this input into bnc, sma etc ...http://cdn.teledynelecroy.com/files/manuals/wm-gs-e_rev_e.pdfAnother document with some photoshttps://www.amplifier.cd/Test_Equipment/LeCroy/DDA5005A_XXL/DDA5005A_XXL.html

author: Jwalling
author_rank: Unknown
timestamp: August 15, 2018, 10:33:06 pm
content: Quote from: coromonadalix on August 15, 2018, 08:41:21 pmThanks, I knew about them but I was hoping to find a low cost alternative. Those seem to go for about $250 USD! I just need to know the part # or type of the connector.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 16, 2018, 03:05:39 am
content: I would guess some TNC connector, hum i think some Hp sig generator has them ?? not totally sure.I think the Lecroy adapters may have some passive or active electronics in them, you have an look a like 6 pins idc connector on them ?

author: nctnico
author_rank: Super Contributor
timestamp: August 16, 2018, 05:59:52 am
content: I think it is a standard MCX RF connector.

author: Jwalling
author_rank: Unknown
timestamp: August 16, 2018, 01:14:25 pm
content: Quote from: nctnico on August 16, 2018, 05:59:52 amThat looks like the one. I just noted that the Tek TDS7154X and up use the same connector.Thanks!

author: ingowien
author_rank: Regular Contributor
timestamp: September 03, 2018, 09:53:43 pm
content: I think these connectors are called BMA (blind mate adapter), OSP/OSM or RPC (Rosenberger Precision Connector), depending on the manufacturer. However there are several different Rosenberger series, I once was told it's RPC-SP and 10S732-K00N5 could work as RPC-SMA Adapter. Though this one is not affordable and not available in single pieces.The original adapters are Lecroy LPA-SMA, LPA-K (3.5mm) or LPA-BNC.You should find some compatible BMA/SMA adapters on ebay. However they don't lock in, so you'll need some external mounting plate and screws to hold them in place.

author: Jwalling
author_rank: Unknown
timestamp: September 04, 2018, 09:22:33 am
content: Quote from: ingowien on September 03, 2018, 09:53:43 pmThanks. I ended up harvesting the connector from a Tek TCA-BNC
Sources of inexpensive equipment over time - Page 1
Forum section: electronics / testgear

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: September 04, 2018, 05:03:05 am
content: The Stanford Research post made me think where one used to get inexpensive equipment over time...Here is my recollection:1980s - save money to buy HP at list price1990s - Stanford Research2000s - Find used equipment on used-line.com2010s - Chinese new equipment, Keysight refurbished deals and e-bay.

author: 001
author_rank: Super Contributor
timestamp: September 04, 2018, 12:30:46 pm
content: It depends on Yours geografic placeIn 1990th at Yugoslavic wars time all test equipment was priced for food here
EU3458A  - Page 1
Forum section: electronics / testgear

author: Alex Nikitin
author_rank: Super Contributor
timestamp: September 03, 2018, 11:14:32 am
content: https://www.keysight.com/en/pdx-2911926-pn-EU3458A/digital-multimeter-8-digit-for-eu-sales-only?As far as I can see there is no difference whatsoever from the "normal" 3458A - so a purelybureaucraticmarketing exercise (and most likely a price increase).CheersAlex

author: Drewbie
author_rank: Contributor
timestamp: September 03, 2018, 12:17:17 pm
content: "This non-RoHS product"= lead solder.

author: ogden
author_rank: Super Contributor
timestamp: September 03, 2018, 12:32:06 pm
content: Quote from: Drewbie on September 03, 2018, 12:17:17 pmIn such instrument could be more than that. Let's say EU-restricted hazardous substances.

author: Wolfgang
author_rank: Super Contributor
timestamp: September 03, 2018, 03:37:21 pm
content: ... IIRC, these have been imported into the EU before the ROHS ban deadline.Hefty price tag. The 3458A is more than 20 years old and is a replacement candidate, definitively.The 34465A or the 34470A would be a good design to cling to. Its a pleasure to use, has a lot better connectivity, a truckload of added functions, ...They miss an LTZ1000, however.Update per 9/18: They now call them EU3458A (8ppm) and EU3458AX (4ppm). Prices up by ca. 20%, they are old stock (not lead free) and mustbe ordered directly from Keysight. VAT bills only on request. Keysight says price increase is due to storage cost (?!, I guess it is due to the fact that allthe stored models need a recalibration before shipping). IMHO, this is not worth the money, because this thing is *really* old (VFD, no USB, no graphic display).I ordered a 34470A. That should do it, and what I hear Fluke as well as Keysight work on new reference multimeters.

author: 2N3055
author_rank: Super Contributor
timestamp: September 03, 2018, 03:48:56 pm
content: Quote from: Wolfgang on September 03, 2018, 03:37:21 pm34470A has LTZ1000..
Tell me about simple batteryt tests please - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: September 03, 2018, 07:49:33 am
content: HiI put 360Ohm resistor and 9V battery in SERIES and read current (25mA is ok)But someone told me what I must connect resistor in PARALLEL with battery and read VOLTAGE sag

author: PhilipPeake
author_rank: Regular Contributor
timestamp: September 03, 2018, 08:19:31 pm
content: Either will work, you can calculate one from the other.In your case, you have 360 ohms across 9v. You see 25mA flowing, so you know the voltage (I*R) must be 9v.Your load is not causing the voltage to drop, so your battery would appear to be ok.

author: DaJMasta
author_rank: Super Contributor
timestamp: September 03, 2018, 08:35:14 pm
content: Since your circuit only has a source and a load, completing the circuit will make the load in series or parallel interchangeably, the terms really only apply when there is more than one element in the circuit.Probably the beginner forum is a better place for this, since it's not about test equipment.
HP8920A problem  - Page 1
Forum section: electronics / testgear

author: Stan
author_rank: Newbie
timestamp: August 19, 2018, 10:00:54 am
content: Hi peopleI have a HP8920A service monitor.When I turn it on, I passed the test itself.I have a problem measuring the transmitter power.Namely, the measurement of power is about 20% less.Also, while the transmitter is activated, the power level slowly decreases. For about 60 sec., it drops by 1W.When measuring the power level on the spectrum analyzer, there is also slightly less reading (approximately 10%), but the level is stable.Does anyone have any suggestions, where is it, and how to solve this problem?I know the problem is not simple and it's probably necessary to calibrate.However, calibration firms are mostly in the United States, so sending devices from Europe is very complicated and costly.Thanks in advance!Stan

author: mojoe
author_rank: Frequent Contributor
timestamp: September 03, 2018, 10:35:26 am
content: There are some built-in tests that you can run. The on screen instructions will walk you through them. You might also download the manuals from the Keysight/Agilent/HP web site.How much power input is your unit rated for? There are several input attenuator options. It is marked on the front, at the RF input connector (assuming someone didn't swap it out and not mark the front panel correctly). How much transmitter power are you using?The input attenuator is rated for continuous power input. It is derated to so many seconds per minute when you exceed that rating. For example, the standard 60 W attenuator can be used for 100 W for brief periods, with a longer cool down time. I don't remember the exact numbers, but it is in the manual.As for the spectrum analyzer showing slightly different levels vs the power meter on the TX screen, that is normal. While you are downloading manuals, get the spec sheet as well, and look that over.

author: mojoe
author_rank: Frequent Contributor
timestamp: September 03, 2018, 10:42:02 am
content: One other thing. for a simple and inexpensive RF power reference, go tohttp://w1ghz.org/small_proj/small_proj.htm,scroll down the page, and look for "RF Power Reference". I have one and it provides a very accurate -10 dBm reference at 50 MHz.
Huntron Tracker 2000 – 87C51 Firmware Dump Available? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: February 21, 2018, 11:41:04 pm
content: Hi!The prices of these Huntron Tracker 2000 instruments are going thro' the roof on fleabay, so much so that I reckon I can build one from the Parts Lists, schematics and layouts in the original Maintenance Manual for less!Has anyone been able to extract the Firmware Dump from the 87C51 MPU used in this, or has anyone got a programmed one they can sell me from an old, spare or unrepairable unit?All reasonable costs of a chip reimbursed if there's no dump available – I've never been able to find out if the MPU is locked or not as my manager at my work that has one of these instruments watches me like Quelch in the W.G. Bunter stories and I daren't take my employer's one to bits!Chris Williams

author: Silicon Steve
author_rank: Newbie
timestamp: August 29, 2018, 07:33:56 am
content: Hi ChrisHave two Huntron 2000's that the PIC chip version 1.0 has been damaged. Have requested the firmware from Huntron hopefully they may help. If not will try downloading the firmware from the damaged IC's. As they are damaged I dont know how well that will go. If the firmware is intact will email it to you. If you have managed to get the firmware would love a copy.Steve

author: CJay
author_rank: Super Contributor
timestamp: August 29, 2018, 07:54:21 am
content: The code protection on early 805x chips wasn't 'all that' and could be defeated quite simply with some rather easy tricks involving PSEN and an external EPROM.Some later variants had better protection but could still be read out.

author: mojoe
author_rank: Frequent Contributor
timestamp: September 03, 2018, 10:10:24 am
content: If you are going to build something, look in the Aug 2018 issue of Circuit Cellar magazine. There is a curve tracer built using an NXP dev board. I have only glanced at the article so far, but it looks interesting.BTW, thanks to Saelig for sending the free magazine along with my new scope. I haven't read Circuit Cellar in years, so I would have missed this article.
Search of manual + schematics Voltcraft ETU-3020 or Alecto TM-300 - Page 1
Forum section: electronics / testgear

author: flash2b
author_rank: Regular Contributor
timestamp: January 08, 2018, 09:43:48 am
content: I am trying to find the schematics of the Voltcraft ETU-3020 which I am restoring. This model is also sold as Kingdom ETU-3020, Renkforce ETU-3020, Redpoint ETU-3020 and Alecto TM-300.I have found a reference of the Kingdom version, but the scan I got back is really awfull quality.The meter looks like below, but my meter is the Alecto version. Inside on the PCB it is marked as 3020N.I was hoping someone here has the manual which should contain the schematics as well. I believe the meter is made by Hung Chang (Korea). I cannot find it on the Conrad site, I believe the Voltcraft and Renkforce versions were sold by Conrad.Thanx in advance.

author: canario
author_rank: Newbie
timestamp: September 02, 2018, 07:10:11 pm
content: Dear flash2b,I aRenkforce ETU-2030 and have just scanned the manual. It's very old, but in good shape.As you will see, the schematics is in the last page of the manual. I hope it helps you and others!!!Find the manual on my webpage:https://albertoarbelo.neocities.org/community/Renkforce_ETU-3020.htmlKind regards from Catalonia.

author: flash2b
author_rank: Regular Contributor
timestamp: September 03, 2018, 07:59:41 am
content: Thanx Canario for the manual. Your scans are very good quality.Good to see a reply after 8 month, this is a great forum.
USB scope with XYZ access - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: September 02, 2018, 04:26:37 pm
content: Hi,My CRT based equipment, such as scopes and SpecAn have very difficult to read displays. But many of them have XYZ output. So I was looking for an alignment scope or vector scope of some kind to display output on a large screen. But search has not been very fruitful.Does anyone know of a USB based scope with XYZ input, and can do X-Y mode? While Z port is pretty much common on analog type scope, I have not seen many on more recent digital models, and if it does, they are almost always high-end stuff. I want an inexpensive kind. To give a complete picture of my desired setup, SpecAn generates XYZ signal, that gets fed to a USB based scope, and it feeds into a computer and to a large display. Basically, I'm using USB scope as a scan converter between XYZ and VGA.Thanks for helping out. I'm getting tired of taking off my glasses and squinting.

author: David Hess
author_rank: Super Contributor
timestamp: September 02, 2018, 07:50:53 pm
content: Some (very few) DSOs include a Z-axis input for X-Y mode but I have never heard of a USB DSO which does.

author: DaJMasta
author_rank: Super Contributor
timestamp: September 02, 2018, 08:40:48 pm
content: If you're willing to program a bit, I'd imagine any USB scope with 3+ inputs and an ability to use the data in external applications could do it, though.

author: tkamiya
author_rank: Super Contributor
timestamp: September 03, 2018, 02:05:58 am
content: I thought about home brewing or programming but I'd rather not do that in this case.Some of the digital scopes I already have, some of them mid to high-end, performs badly in XY mode. If that's all I can get, then I have no choice but do it myself...How inexpensive DSO performed weren't even funny as a joke.
Yokogawa WT110/WT130 upgrade /EX1 or /EX2 external sensor input - Page 1
Forum section: electronics / testgear

author: ingowien
author_rank: Regular Contributor
timestamp: September 02, 2018, 11:51:56 pm
content: I finally got a WT130 3-channel power meter which seems to be a discontinued but still quite decent power meter.Unfortunately my model doesn't have the external current sensor input option (/EX1 or /EX2). So it's currently limited to the 0.5A range as lowest current range. For AC I could use a current transformer but for DC it would be cool to use the MicroCurrent as external current sensor for the WT130. And it would probably be more accurate for AC, too.- Does somebody know if /EX1 or /EX2 can be added to a WT130 or WT110?I noticed two solder jumper on the input boards (got three of them) that can be shorted either for EX1 or EX2. All components seem to be populated except for the input connector that needs to be added and connected to one of the unpopulated EX1 or EX2 input vias on the board.- Does anybody know if it's sufficient to close the solder jumpers for e.g. EX2 to get the input options (currently they are disabled in the menus).- Or is it required to enable the option in the device as well and not only on the input boards? If so, do you know how this is done (another jumper, a special command, different firmware...)?I haven't disassembled the meter completely so I don't know if there are other jumpers. I think it might be better to ask in the forum and maybe get some hints from Yokogawa experts first.best regardsIngo
DMM input impedance -- FALSE specifications?! - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: September 02, 2018, 11:47:55 am
content: Hi!Many DMMs (Fluke 8020A, Mastech M3900 etc) marked as "10M impedance atALLranges" but is it true?But I see simple resistive divider at schematic9M resistor is on only at 1000v DC range, isn`t it?900k for 200V range90k for 20V range etcWhat I misunderstud?

author: schmitt trigger
author_rank: Super Contributor
timestamp: September 02, 2018, 12:11:50 pm
content: You are misunderstanding a lot.What you are describing is the way analog meters worked, where actual current drove the needle movements.

author: 001
author_rank: Super Contributor
timestamp: September 02, 2018, 12:37:12 pm
content: WellBut what is the difference in simple dividers?The example is

author: Kleinstein
author_rank: Super Contributor
timestamp: September 02, 2018, 12:44:24 pm
content: The simple DMMs use mainly one of 2 type of input dividers:1) A divider with 10 M total resistance and a very high impedance (> 1 GOhm) amplifier from one of the taps. To input impedance is essentially constant, the extra amplifier impedance would be in parallel in the lowest range, but that would be only a < 1 % change.2) A kind of inverting amplifier with a 1 M Resistor at the input. The feedback Resistor is switched to adjust the gain of the initial stage, that can very well be smaller than 1.

author: ogden
author_rank: Super Contributor
timestamp: September 02, 2018, 12:46:28 pm
content: Quote from: 001 on September 02, 2018, 12:37:12 pmSorry? What exactly you are asking? Please rephrase your question, be more specific.

author: MasterT
author_rank: Frequent Contributor
timestamp: September 02, 2018, 01:28:19 pm
content: What I see, divider is the same for all ranges, R1-R6, Input in "V" position connected to upper side of the R1 - 2x 4.5 M. Summ of the R1-R6 is pretty close to 10M.

author: David Hess
author_rank: Super Contributor
timestamp: September 02, 2018, 02:03:24 pm
content: There are two common input divider arrangement for voltmeters which are briefly discussed in thisapplication note from Intersil.The one you are describing which is used in manual ranging meters like the Fluke 8020A and Mastech M3900 has a constant input resistance. The decade resistor divider string usually adds up to 10 megohms.The other style is used in automatic ranging meters because it is difficult to implement a floating high voltage semiconductor switch. Instead of a series string of resistors, a single input resistor is used with a set of selectable shunt resistors with the switches at ground potential. The disadvantage of this scheme is that the input resistance varies somewhere between 11 and 9 megohms. Unfortunately these meters are usually advertised as having a 10 megohm input resistance which is a lie.

author: 001
author_rank: Super Contributor
timestamp: September 02, 2018, 03:57:09 pm
content: Great answer! Thanx a lot!
HP8350B spectral purity concern - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: August 29, 2018, 07:15:21 pm
content: I just purchased an HP8350B with 83525B RF plugin. This is a sweeper with 0.01 to 8.4Ghz.Hooked up to a spectrum analyzer and I got THIS.... I'm a bit surprised with this spectral purity. For this picture purpose, I have scanning stopped. It is generating 105Mhz and span is 20Mhz. Spec Analyzer is HP8590EMIs this right?

author: rfeecs
author_rank: Frequent Contributor
timestamp: August 29, 2018, 11:35:36 pm
content: Do you have internal modulation turned on? I seem to recall there was a button to turn on internal square wave modulation for use with a scalar network analyzer.

author: tkamiya
author_rank: Super Contributor
timestamp: September 02, 2018, 02:44:02 am
content: No, but I left the unit with a local cal house. Tech stated it is now functioning as it should. Thank you for taking your time to reply.
BWD 275 Power Supply - Manual / Schematic wanted - Page 1
Forum section: electronics / testgear

author: Wirregar
author_rank: Newbie
timestamp: January 12, 2017, 11:33:33 am
content: I have acquired a BWD 275 Power Supply. It is dead and I want to fix it. I am searching for a circuit diagram, or manual, or anything that may assist.BWD 275 Dual range programmable DC power supply (36V/2A, 72V/1A)Whats wrong with it? Its just dead, No smoke, nothing. AC volts are good, most Semi conductors I've tested and are good. Most caps are good. (there was a dead green cap across a secondary winding of the transformer, but thats been replaced and no change)Thats why I need a circuit so I can possibly trace a few things and check board voltages.I've done a search online and came up with nothing, hoping someone has one handy that can be scanned and sent to me, or purchased and sent to me.Any tech info on this power supply welcome.TIADarryl

author: tautech
author_rank: Super Contributor
timestamp: January 12, 2017, 07:58:57 pm
content: Welcome to the forum.There's not one here but there might be something close that can get you "on the way".http://www.kevinchant.com/bwd.htmlGive Kevin an email, he might know where a manual is or can point you to one he has that's similar.

author: Pharkwit
author_rank: Newbie
timestamp: September 02, 2018, 12:36:11 am
content: This thread may be a bit old, but a google search for the 275 currently lists this page as the top result, so if anyone is looking for this information you can now find it here:http://bama.edebris.com/manuals/bwd/275/
Flir IM75 Teardown - Page 1
Forum section: electronics / testgear

author: threephase
author_rank: Regular Contributor
timestamp: September 02, 2018, 04:49:39 pm
content: Some pictures of the insides of a FLIR IM75 Insulation Multimeter - in the end I was a little disappointed with this instrument, nice build quality if you conveniently ignore the foreign objects inside, but functional implementation is a bit questionable given the high end manufacturer and price tag.I won't post the test data here as I still haven't mastered laying out a blog on this forum, but if anyone wants to see any test results from it, they can go to the following blog on Farnell Element14.https://www.element14.com/community/groups/test-and-measurement/blog/2018/08/27/flir-im75-insulation-tester-dmm

author: threephase
author_rank: Regular Contributor
timestamp: September 02, 2018, 04:52:17 pm
content: Bristle found under selector switch when opened up. Other than that it was a good quality build, machine screws used throughout, boards looked to be clean with no solder residue.

author: threephase
author_rank: Regular Contributor
timestamp: September 02, 2018, 04:55:38 pm
content: Comes nicely boxed if you are into that type of thing, but has its moments when testing a motor.

author: bloguetronica
author_rank: Frequent Contributor
timestamp: September 03, 2018, 03:39:54 am
content: Hi,I like how the switch is designed. Very simple, but effective. I bet you can disassemble it and the contact leafs won't go out of their place. They seem to be crimped to that red plastic bar. The build quality looks good, and they even used a proper Bussman fuse. Nice!Kind regards, Samuel Lourenço

author: threephase
author_rank: Regular Contributor
timestamp: September 03, 2018, 03:07:27 pm
content: Thanks for reading, it certainly is a good quality built. But you would expect that from the price tag.I have looked through my pictures and didn't take a close up of the function switch and have unfortunately overwritten the high resolution version of the photo showing it alongside the case.Kind regards
Rigol DS1045Z and pyvisa bug ? - Page 1
Forum section: electronics / testgear

author: JohnPi
author_rank: Regular Contributor
timestamp: September 01, 2018, 05:09:50 pm
content: I am trying to read binary waveforms from my 1045Z using pyvisa over USB. Using sockets over LAN (no pyvisa) works. I have a problem when reading certain specific lengths of data from the instrument -- specifically lengths of 8244 and increments of 64 beyond; using MDEPTH of 30000. I don't know if the issue is in the instrument or pyvisa. I have filed a ticket athttps://github.com/pyvisa/pyvisa/issues/354also. I have tried pyvisa 1.9.1, 1.9.0 & 1.8. My 1054Z is unlocked to 1104Z. This is the *IDN? RIGOL TECHNOLOGIES,DS1104Z,DS1ZA20100****,00.04.04.SP3If anyone has the same setup, perhaps with different software/firmware versions, I would appreciate if you could run this example and report:Code:import visaimport numpy as npimport sysprint(sys.version)print("visa", visa.__version__)#visa.log_to_screen()GPIB = visa.ResourceManager()for resource in GPIB.list_resources(): print(resource) # list instruments -- use the 1054Z in the next lineDS1054Z = GPIB.open_resource('USB0::0x1AB1::0x04CE::DS1ZA20100xxxx::INSTR', chunk_size=40000) # You'll have to change this lineprint("DS1054Z:", DS1054Z.query("*IDN?"))DS1054Z.write(":WAV:FORMAT BYTE;:WAV:MODE RAW;:SYSTEM:BEEPER OFF")DS1054Z.write(":ACQUIRE:MDEPTH 30000")DS1054Z.write(":STOP")err=0#for NPOINTS in range(20010,30100):for NPOINTS in range(8200,30100):# fails at 8244 and increments of 64 beyondprint(NPOINTS, end='')err+=1DS1054Z.write(":WAV:START 1;:WAV:STOP %i;:WAV:DATA?" % NPOINTS)print(">",DS1054Z.read_bytes(11),"<", end='') # Contains '#90000ddddd'try:CURVE1 = np.frombuffer(DS1054Z.read_bytes(NPOINTS), dtype='b')except:print("\nError at", NPOINTS, " after ", err)err=0print(len(CURVE1), "chars")DS1054Z.read_bytes(1) # trailing '\n'This tests reading lengths from 8200 on in increments of 1. I see fails like this:Code:8241> b'#9000008241' <8241 chars8242> b'#9000008242' <8242 chars8243> b'#9000008243' <8243 chars8244> b'#9000008244' <Error at 8244 after 82438243 chars8245> b'#9000008245' <8245 chars8246> b'#9000008246' <8246 chars8247> b'#9000008247' <8247 charsand filtered, the patterns looks like:Code:Error at 8244 after 8243Error at 8308 after 64Error at 8372 after 64Error at 8436 after 64Error at 8500 after 64Error at 8564 after 64Error at 8628 after 64Error at 8756 after 128Error at 8820 after 64Error at 8884 after 64Error at 8948 after 64Error at 9012 after 64Error at 9076 after 64Error at 9140 after 64Error at 9268 after 128Error at 9332 after 64Error at 9396 after 64Has anyone seen anything similar to this ?
These look like nice benches for the lab (USA) - Page 1
Forum section: electronics / testgear

author: ivan747
author_rank: Super Contributor
timestamp: September 01, 2018, 12:46:47 am
content: Hey guys, I stumbled upon this website and they really have some nice benches. They look perfect for electronics. I wish I had something like that locally. Check it out (and the related products):https://www.globalindustrial.com/p/work-benches/open-leg/adjustable-height/60-x-30-maple-square-edge-work-bench-adjustable-height-1-3-4-topThey have some modularity as well, selling "risers" (kind of like a metal shelf that mounts on top of the bench) and you can add power outlets directly in the legs. No affiliation, I just wish I had stuff like this locally. It's too large and heavy to import conveniently.-Ivan

author: maginnovision
author_rank: Super Contributor
timestamp: September 01, 2018, 04:23:22 pm
content: Benchpro produces the "same" things but they know the weight limits. Also offer proper esd benches and chairs.
Siglent SDS2000x bandwidth hack? - Page 1
Forum section: electronics / testgear

author: EEBlackSheep
author_rank: Contributor
timestamp: August 31, 2018, 03:18:57 pm
content: Heard from a very reliable source that the Siglent SDS2000x scope can be hacked to increase bandwidth. I was lead to believe that this is an undisclosed marketing strategy to get more amateur users to purchase their product (sounds good to me!).Anyhoo - has anybody heard much about this? I am not sure if I am quite up to the skills of hacking it, but I am willing to give it a shot if I have some good guidance.baaah

author: janekivi
author_rank: Frequent Contributor
timestamp: August 31, 2018, 03:26:06 pm
content: And this source was... there?https://www.eevblog.com/forum/testgear/siglent-sds2000x-hack/

author: EEBlackSheep
author_rank: Contributor
timestamp: August 31, 2018, 04:30:29 pm
content: Oops- gotta practise up on my search skills - missed that one entirely.

author: tautech
author_rank: Super Contributor
timestamp: August 31, 2018, 08:20:00 pm
content: Quote from: EEBlackSheep on August 31, 2018, 03:18:57 pmCertainly not !These products have been around for 5 years previously as SDS2000 and now with HW improvements SDS2000X.This is how long it has taken some of the clever ones to find the improvements and make them public.Others have done it some years ago and kept quiet.Some deep study of forum posts can find this evidence.
BM869s Maximum Logging Rate - Page 1
Forum section: electronics / testgear

author: IanB
author_rank: Super Contributor
timestamp: August 31, 2018, 05:07:58 am
content: I started doing some tests with the BM869s data link cable, curious about how fast data can be retrieved over the cable.Here is the result of my first preliminary test where I just tried to retrieve data as fast as possible. I got a sample interval of about 200 ms. The data were mostly smooth and without jitter, except there was one data point shifted with the wrong time stamp. I don't know the cause yet, it may have been the fault of the logging PC. I got two errors like this in 100 seconds of data.It is probably conservative to retrieve data on a 250 millisecond clock tick. More experiments are needed.Code:timeVoltage08.80.2158.60580.3998.43520.5918.28040.7998.13850.9918.00811.1757.88711.3917.77451.5757.66941.7677.57061.9757.47782.1677.39022.367.30672.5677.22652.7517.15042.9687.07643.1527.00483.3436.93643.656.87013.7446.80553.9286.74284.1446.68174.3366.62244.5196.56474.7276.50844.9196.4527

author: joeqsmith
author_rank: Super Contributor
timestamp: August 31, 2018, 09:13:33 am
content: It's hard for me to think of an error every 250 reads as being good enough. Maybe one out of a million or billion.What's the error rate when using their software?

author: IanB
author_rank: Super Contributor
timestamp: August 31, 2018, 06:02:40 pm
content: I will do a similar test with the Brymen software.Since the value comes from the DMM and the time stamp comes from my code, and since the value is apparently correct while the time stamp is shifted, it may be the problem lies with the generation of the time stamp. I will investigate further. My test app is only very crudely constructed at present. I'm just experimenting.
Can we calibrate Pro'sKit MT-1707 DMM ourselves? - Page 1
Forum section: electronics / testgear

author: wuiven64
author_rank: Newbie
timestamp: August 30, 2018, 08:57:38 am
content: Hi,I have done a current measurement using three Pro'sKit MT-1707 DMMs. As shown in the attachment, the second DMM has different reading compared to the other two DMMs by 0.03 A (approximately 1.5%).Can I calibrate the MT-1707 myself with the help of the 6.5 digit DMM? Or, in other words, can end user calibrate MT-1707 own self?

author: coromonadalix
author_rank: Super Contributor
timestamp: August 30, 2018, 10:09:53 am
content: Open the case and check if you have some trim pots in it, if there is, before touching them, take measurements of them just in case, note the values on a sheet.Try to find the Meter chip specs in it, hoping its not a black blob ....
Fluke 97 firmware update scopemeter Instrument Security Procedures - Page 1
Forum section: electronics / testgear

author: harrimansat
author_rank: Regular Contributor
timestamp: September 01, 2018, 12:02:07 pm
content: Hi folks!I found document "Instrument Security Procedures for Fluke 9x Series ScopeMeter" which says - The operating code (instrument firmware) stored in D101-D102 on the A201 module can be read using special remote interface commands. Calibration constants stored in D101-D102 on the A201 module can be read using special remote interface commands.May be someone knows these two special remote interface commands? I need to save both:instrument firmware and calibration constants from my Fluke 97.Thanks.http://assets.fluke.com/manuals/93_95_97mveng0000.PDFThanksRegards
Amazing china gear for 2018? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: August 28, 2018, 02:39:24 pm
content: I see a lot of bargain and amazing things from China like DMMs based on 0660 chip in 2016 and signal generators in 2017!What about 2018?

author: stj
author_rank: Super Contributor
timestamp: August 28, 2018, 08:54:35 pm
content: 2018 = amazing value decent scopes IMO.

author: 001
author_rank: Super Contributor
timestamp: August 29, 2018, 02:11:23 pm
content: thanx a lot!what models do You mean?

author: stj
author_rank: Super Contributor
timestamp: August 29, 2018, 05:21:52 pm
content: Rigol and Siglent mostly.

author: 001
author_rank: Super Contributor
timestamp: August 29, 2018, 05:51:05 pm
content: what models You impressed?

author: stj
author_rank: Super Contributor
timestamp: August 29, 2018, 09:37:44 pm
content: it's not so much about models,it's more about the price they have dropped to and the features you get for that price.4channels at 100MHz for under 500£/$/€ is pretty amazing.
getting familiar with CMU200. - Page 1
Forum section: electronics / testgear

author: ar__systems
author_rank: Frequent Contributor
timestamp: August 19, 2018, 02:45:26 pm
content: I've got myself CMU200 with a purpose of using it for pre-compliance emission testing.I'm trying to make sense of the numbers I reading, and there is something I don't understand. If setup the the generator to output level of -35dBm, should not I be getting that number from the Analyzer meter?Both in and out are connected to the same RF2 port, so the connection between generator and analyzer is internal.Now, as you see on the attached pics, the reading of power is about 10dBm higher than the output of the generator. And it is always about 10dBm higher, at various levels of the generator.I have tried RF_Mode manual, and different values for RF_Attenuation, which don't make any difference.I would appreciate any advice. Either I'm missing something in the setup of the CMU200, or I'm missing something more important, or the unit requires adjustment...

author: capt bullshot
author_rank: Super Contributor
timestamp: August 19, 2018, 04:26:25 pm
content: That's not the way it is intended.If you want to measure the generators output level, you'll have to select different connectors and connect them externally.

author: ps
author_rank: Regular Contributor
timestamp: August 29, 2018, 07:32:40 pm
content: Try a 50 Ohm termination at the output. Without that, your generator is working into open load which will affect the results.Or use two different ports, as suggested above.
Fluke 289 replacement display - Page 1
Forum section: electronics / testgear

author: Tim5000
author_rank: Contributor
timestamp: August 27, 2018, 02:27:55 pm
content: Hi,I've got a Fluke 289 that I bought 2nd hand quite cheap a while back that works perfectly fine except for 3 dead horizontal lines.It's not my favourite Fluke by far (the 189 and 87V are my go to units) but it's OK as something to have in the collection.If there's a known cheap replacement I'll give it a go, however I suspect to replace it will be over £100 so I probably won't bother.Any ideas?I did strip it to try and repair and gave the connections/ribbons a clean, but decided it wasn't worth risking doing much more (heat-gun etc).Thanks.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 27, 2018, 09:45:17 pm
content: https://www.ebay.com/itm/U-S-A-FLUKE-289-LCD-Display-Meter-Display-Fluke-LCD-OEM-new/262485299580?hash=item3d1d57d17c:g:dPgAAOSwZW5Z~6H2at 129$ usd outchYou have to search the numbers written on the back of the lcd, maybe you can find cheaper

author: Terry01
author_rank: Frequent Contributor
timestamp: August 27, 2018, 10:59:36 pm
content: Quote from: Tim5000 on August 27, 2018, 02:27:55 pmI don't think "Fluke" and "cheap replacement" go together buddyYou may be lucky and pick something up on Ebay to use as a parts mule or something but I doubt even a 289 that doesn't work will come cheap!Crap eh?

author: coromonadalix
author_rank: Super Contributor
timestamp: August 27, 2018, 11:06:08 pm
content: Indeed Fluke and cheap doesn't work wellOrdered battery clips kit and rear casing for an 189 $$$$ cost as much as an Ebay 189 meter ...

author: Terry01
author_rank: Frequent Contributor
timestamp: August 28, 2018, 07:41:28 am
content: Quote from: coromonadalix on August 27, 2018, 11:06:08 pmI quite believe it buddy! The bits for Fluke stuff is priced well over the top i'd say but where else can you go? The Fluke stuff is top notch and they know it.I suppose too at least you know the parts are genuine and not cheap junk going back in your meter. For some people too it really is "how much is your life worth to you" right?The only thing with fixing your meter as opposed to buying a whole new unit from Ebay is at least you know the history of your own meter. Some stuff from Ebay is alright but other stuff? Who knows??

author: Tim5000
author_rank: Contributor
timestamp: August 29, 2018, 08:40:14 pm
content: No worries - I thought it's worth a shot in case anyone had a good source.It's not a big worry to me - the meter still works and it's still easy enough to make out what's written.If it were £30-£40 I'd do it but I'll live with it at that price!Thanks.
Crippled TDS5054B? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: August 30, 2018, 09:37:24 am
content: https://www.ebay.com/itm/283130064055?Curious about this one. A normal TDS5054B can sample at up to 5GS/s. This one can only do 1GS/s.

author: dxl
author_rank: Regular Contributor
timestamp: September 01, 2018, 08:10:12 pm
content: I think this is due to export restrictions. I've also seen a 1GS/s "option" in a TDS7xx user manual some years ago.

author: Jwalling
author_rank: Unknown
timestamp: September 02, 2018, 09:23:51 am
content: I took a closer look at the unit, and was just able to make out the serial #https://www.tek.com/mytek_support_status/TDS5054B-NV-T/B021820It was sold to the Dept of The Navy!

author: snoopy
author_rank: Frequent Contributor
timestamp: September 03, 2018, 01:48:51 am
content: and yet the total sampling rate for all channels combined is 2.5Gs/s in the example provided !

author: Jwalling
author_rank: Unknown
timestamp: September 03, 2018, 09:33:25 am
content: Quote from: snoopy on September 03, 2018, 01:48:51 amI'm guessing, but I think the limitation is 1Gs/s on all four channels simultaneously, and 1Gs/s on any one channel. A standard TDS5054B would be 1.25Gs/s on all four channels, 2.5Gs/s on two channels, and 5Gs/s on one channel.
Old Dick Smith Multimeter? - Page 1
Forum section: electronics / testgear

author: numloxx
author_rank: Contributor
timestamp: May 07, 2016, 04:06:05 am
content: Hi all,Since I bought the EEVBLOG BM235 DMM, I thought I would get rid of some of my older DMM's that I don't use anymore, and I found one that I believe it from Dick Smith.Product code is Q1051 and there is what I think is a date code 02/99.Planning to send it in to Dave later on.

author: tautech
author_rank: Super Contributor
timestamp: May 07, 2016, 04:52:26 am
content: Quote from: numloxx on May 07, 2016, 04:06:05 amAnd into the bin it will go.

author: numloxx
author_rank: Contributor
timestamp: May 07, 2016, 07:00:34 am
content: Ah good point. No worries. I'll wait until I have some other more interesting gear to send him. Thank you

author: crispy_tofu
author_rank: Super Contributor
timestamp: May 07, 2016, 07:46:29 am
content: Looks like one of those DT-830 multimeters, honestly quite meh...

author: Fungus
author_rank: Super Contributor
timestamp: May 07, 2016, 10:50:41 am
content: Quote from: crispy_tofu on May 07, 2016, 07:46:29 amI was going to say the same, did Uni-T clone the 830?They're quite different on the inside though.

author: 001
author_rank: Super Contributor
timestamp: August 29, 2018, 02:27:06 pm
content: Ohho!It looks MORE ROBUST then noname 830 meters!DIP components and MOV for input protection and additional voltage reference is not common for cheap DMMsCompare it with nowday nonamehttps://www.eevblog.com/forum/testgear/dt-838-digital-multimeter-just-curious/Looks like good piece of nostalgy of 90th )))))))

author: jeroen79
author_rank: Frequent Contributor
timestamp: August 29, 2018, 06:57:33 pm
content: Quote from: Fungus on May 07, 2016, 10:50:41 amOr the DT-830 meters are a clone of this one.I wonder how much different it is.I can see the same overall structure but with more through-hole stuff and the ICL7106 chip-under-a-blob on a separate PCB.If you look around a bit on the internet you can sorta see the evolution of this meter from cheap to cheaper.For example:https://hartgeloetet.blogspot.com/2014/09/messgerat-dt-830b-mal-3.htmlDT-830 reviews tend to rather negative but I would be interested in an overview of it's history and lineage.
LOL!!! 2*AAA powered "dt832/harborfreight"-style meter for 2018 )))A - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: August 29, 2018, 05:54:24 pm
content: I can`t say no moreLooks funnyIt is 2*AAA poweredBut ICL7106 on "real" DT832 is not compartible with low voltage supplySome atmega?
Wavecrest SIA 3000 - is it any good as a general purpose oscilloscope?  - Page 1
Forum section: electronics / testgear

author: VE2GYA
author_rank: Newbie
timestamp: August 28, 2018, 01:00:49 pm
content: I found one in a junk shop that powers up. Thinking of going over and offering them $200 CAD for it. looks like the O-scope part of it is good up to 6 Ghz, way beyond my needs of up to 900 Mhz. Would like to use a signal monitor for my ham transmitters as well. Anybody know what voltage range the inputs will accept? I read through the manual but did not see, must have missed it.Cheers David Balcaen VE2GYA Gatineau, Quebec, Canada

author: nctnico
author_rank: Super Contributor
timestamp: August 28, 2018, 09:05:09 pm
content: For $200 I'd just buy it. The inputs are likely 50 Ohms only and usually that means limited to 5V rms. The specifications are usually in a datasheet or specification so google for that.

author: joeqsmith
author_rank: Super Contributor
timestamp: August 29, 2018, 12:21:15 am
content: Nice systems in the day. I don't think you would be happy trying to use it for a general purpose oscilloscope.https://youtu.be/Bg45FuoeHZk?t=762
tek 453 - Page 1
Forum section: electronics / testgear

author: m3vuv
author_rank: Super Contributor
timestamp: August 28, 2018, 02:24:46 pm
content: hi all im trying to display lissajoux traces with of these,i cant seem to do this no matter where i set the controls on this,is it possible on this scope? ,cheers m3vuv.

author: tggzzz
author_rank: Super Contributor
timestamp: August 28, 2018, 02:33:01 pm
content: Specify what you have done, the displays you see, and what you think is/isn't happening.Often writing it down forces you to rethink what you are doing - and you work out the answer for yourself.And, of course, have you RTFM? It is easy to find online.

author: particleman
author_rank: Regular Contributor
timestamp: August 28, 2018, 03:32:32 pm
content: To use X-Y mode, set horizontal to EXT HORIZ set trigger to CH 1 only and B Source to INT
AOYUE 474A++ Desoldering pump station - Changing, Imrpoving - Page 1
Forum section: electronics / testgear

author: Stan-rus
author_rank: Newbie
timestamp: August 26, 2018, 02:41:29 pm
content: Hello everyone, I have just bought AOYUE 474A++ new version with DC pump station.I'd like to discuss its working with someone who has the same one.There is a movie about this station there:I wasn't testing this station by myself, because I didn't make my new workplace yet. I'll make it soon.This station has the Chinese DC pump. I think, would it works better if change this pump to Japanese one.
Siglent SDS1000 DL+ / CML+ / CNL+  running SCPI commands, anyone? - Page 1
Forum section: electronics / testgear

author: tv84
author_rank: Super Contributor
timestamp: August 24, 2018, 08:53:35 pm
content: Anyone with one of these old Siglent is available to run some "interesting" SCPI commands ?

author: StillTrying
author_rank: Super Contributor
timestamp: August 25, 2018, 09:45:12 pm
content: You'll find the number of users interested in the operation of these +'s to be zero.

author: tv84
author_rank: Super Contributor
timestamp: August 26, 2018, 11:14:11 am
content: Quote from: StillTrying on August 25, 2018, 09:45:12 pmI think the numbers are even negative... People don't want to accept they bought the things!BTW, don't you have one?
HCD 1519 1 MHz reference oscillator - Page 1
Forum section: electronics / testgear

author: FransW
author_rank: Frequent Contributor
timestamp: August 24, 2018, 04:00:58 pm
content: I am looking for information and manual of a HCD Research 1 MHz oscillator.The internet does not contain any information on this equipment. Some foto's anddescriptions of people who own(ed) this oscillator but nothing else.It is very old, I estimate over 40 - 50 years but mine is in good working condition.The inner parts are an OCXO, a power supply, some regulating electronics and/or dividers (?).Attached are 2 pictures.If anyone can give me some more information I would be very thankfull.Best regards,Frans
Let's talk about in-circuit transistor testers. - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: August 28, 2018, 01:02:52 pm
content: Right now I'm thinking an efficient in-circuit transistor tester would be quite helpful. Something in the vein of a Sencore Super Cricket (remember those?). Looking for suggestions on good pieces to consider, could be current or older makes, whatever works well is fine by me. Thank you.