hybridfree/eevblog-posts huggingface dataset:
Hantek 3in1 Oscilloscope + Waveform Generator + Multimeter - Page 1
Forum section: electronics / testgear

author: plazma
author_rank: Frequent Contributor
timestamp: November 14, 2018, 03:47:58 pm
content: Have anyone tried these new Hantek models?Are they hackable?https://www.banggood.com/Hantek-3in1-Digital-OscilloscopeWaveform-GeneratorMultimeter-Portable-USB-2-Channels-40mhz-70mhz-L-p-1369465.html?ID=557550&cur_warehouse=CN

author: plazma
author_rank: Frequent Contributor
timestamp: February 04, 2019, 08:28:07 am
content: Anyone got one of these?

author: Fungus
author_rank: Super Contributor
timestamp: February 04, 2019, 09:44:23 am
content: "A real professional and magic scope! buy one and no need buy more equipments!"

author: Alll
author_rank: Newbie
timestamp: February 04, 2019, 04:59:57 pm
content: Yes-https://www.eevblog.com/forum/testgear/hantek-2c422c722d422d72/
R&S FSH3   starts in Maintenance mode when attached to the power supply cable. - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: February 04, 2019, 03:25:30 pm
content: Hello,I have acquired a FSH3 , when inserting the power supply cable, it always automatically starts in Mainenance Mode and warms up in 60 min (counts down to 0 min ), nothong can be selected, keyboard is completely disabled, now If I press the power button, it starts normally.This will not happen in battery mode. any clues how to get rid of the maintinance mode?ThnaksGeorge
Anritsu MS2626A - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 04, 2019, 02:46:56 am
content: I have a Anritsu MS2626A (6.5GHz with TG and other options) that I picked up at a local hamfest that has issues. I have not had the chance to dig into it but I was wondering if anyone has manuals for this unit. I have already looked in all of the usual places.Any help would be greatly appreciated.Thanks,SamW3OHMgroups.io LeCroyOwnwersGroup Owner/Moderator
Uni-t UT203 Clamp Multimeter Teardown - Page 1
Forum section: electronics / testgear

author: electronupdate
author_rank: Regular Contributor
timestamp: March 02, 2013, 06:57:57 pm
content: Bought this multimeter for it's ability to measure higher DC currents. When I tore it down it was better than I expected... much better than my previous buy of a no-name "CP-05" which was entirely hand soldered. Not really sure where UNI-T fits in the spectrum of quality, but this one seems better than bottom-of-the-barrel, which suprised me as it was only $35.00.A video of the review at the following link:

author: SeanB
author_rank: Super Contributor
timestamp: March 03, 2013, 10:38:34 am
content: Very nice, but I would prefer the 204 as it comes with true RMS capability.

author: Lightages
author_rank: Unknown
timestamp: March 03, 2013, 05:32:31 pm
content: Of course your needs will determine the model you want! The UT204 has TRMS, but does not have capacitance nor temperature which the UT204A . Who is it that says "horses for courses"?

author: Mkdsime
author_rank: Contributor
timestamp: February 03, 2019, 08:26:00 pm
content: Hi i have UT204A clamp meter it fell softly and now when i press the select or rel or hold button it beeps sometimes display goes crazy and shuts down. I have cleaned the connections on the pcb, measured the transistors with diode test directly on the board all 'Y1' SMD transistors have short between 2 pins. What could be the problem if someone knows please help somehow thanks and take care.
Signal hound BB60C  VS TEKRSA306 - Page 1
Forum section: electronics / testgear

author: Seattle SDR
author_rank: Newbie
timestamp: February 02, 2019, 08:52:50 pm
content: Hello group I have been looking at both of these units and have watched some great reviews. I was wondering if anyone has used both of them? I see things about the 306 like -55 spurs and then read things about the BB60C having dynamic range like a 8 bit SDR but no spurs. So I am just looking for someone to help push me in one direction. I like the the BB60C works with HDSDR and the HF portion is directly sampled. Thanks for any input.
Tektronix TDS7104 scope hang on splash screen - Page 1
Forum section: electronics / testgear

author: STDio
author_rank: Newbie
timestamp: February 02, 2019, 09:54:05 am
content: Hi,I did change the NVRAM battery and reconfigure the boot data using TTL to the MAX232 chip,the acquisition board stops at the below terminal line..Executing startup script c:\vxBoot\dio_rst.vsh ...dbFsIoctl: invalid code 3################### topScript starts ###############################cd "dbfs:c:/vxBoot"value = 0 = 0x0ld < TekScope.ovalue = 23662208 = 0x1690e80ld < TekScopeSM.ovalue = 23661568 = 0x1690c00BoardIdOverride = 21.pDbDev = ramDevCreate(0, 512, 1152, 1152, 0)BoardIdOverride = 0x1341f8c: value = 21 = 0x15undefined symbol: pDbDevDone executing startup script c:\vxBoot\dio_rst.vshKERNEL: RUNNING TIME SLICED AT 10 TICKS PER SLICE!->Was wondering the HDD image wasn't modified yet the NVRAM doesn't let the image load...

author: TiN
author_rank: Super Contributor
timestamp: February 02, 2019, 01:49:13 pm
content: You need to use c:\vxBoot\topScript.hw in standard config.

author: STDio
author_rank: Newbie
timestamp: February 02, 2019, 08:30:30 pm
content: Now I got a ' -' on the LED dianostics after running the boot update file..dbFsIoctl: invalid code 3#################### topScript starts ################################# This script is for standalone prototypes that want to update# their bootROMs to the newest version in the# scope's c:/vxBoot directory.sysFlashUpdate ("dbfs:c:/vxBoot/boot.bin")sysFlashUpdate: TESTING: comparing regionsysFlashUpdate: Erasing flash...donesysFlashUpdate: Writing flash sectorss0@0xff800000................s1@0xff810000................s2@0xff820000................s3@0xff830000................s4@0xff840000................s5@0xff850000................s6@0xff860000................s7@0xff870000................sysFlashUpdate: SUCCESS: flash writtensysFlashUpdate: TESTING: comparing regionvalue = 0 = 0x0setLED 0x40value = -65 = 0xffffffbf = ppp_parms + 0xffc4f02f## hopefully you get this message at the end:# sysFlashUpdate: SUCCESS: flash written# sysFlashUpdate: TESTING: comparing region# value = 0 = 0x0Done executing startup script c:\vxBoot\topScript.vxwKERNEL: RUNNING TIME SLICED AT 10 TICKS PER SLICE!->
U1173B ir to usb cable... - Page 1
Forum section: electronics / testgear

author: GregerG
author_rank: Contributor
timestamp: February 02, 2019, 09:32:16 am
content: Hey,is there a way to clone the U1173B IR to USB cable? Or otherwise directly hook up an rs232 cable to the U1273AX multimeter?CheersGreg

author: Helix70
author_rank: Unknown
timestamp: February 02, 2019, 10:18:11 am
content: They are cheap. Why not just get the real thing?

author: GregerG
author_rank: Contributor
timestamp: February 02, 2019, 10:35:29 am
content: I make my own pcbs so why not...

author: coromonadalix
author_rank: Super Contributor
timestamp: February 02, 2019, 02:29:42 pm
content: Maybe some ftdi ir interface could work, hoping the output data is not "formatted" in a wayGood luckSigrok infoshttps://sigrok.org/wiki/Device_cables#Agilent_U1173BSomes infos / docshttps://www.keysight.com/en/pd-2314431-pn-U1173B/handheld-digital-multimeter-pc-connectivity-cable?pm=PL&nid=-31912.1063037&cc=CA&lc=freSome previous workshttps://www.eevblog.com/forum/testgear/howto-u1272a-firmware-update-with-u1177a-bluetooth-adapter/Again some litteraturehttps://www.manualslib.com/manual/1416332/Keysight-U1177a.html?page=6#manual

author: richnormand
author_rank: Unknown
timestamp: February 02, 2019, 06:46:43 pm
content: This might be useful too:https://www.eevblog.com/forum/testgear/bunch-of-keysight-u1252b-meters-around/msg1216885/#msg1216885Post number 407The U1173B IR to USB cable might be close to the U1173A. I think I still have a pcb left over.

author: GregerG
author_rank: Contributor
timestamp: February 02, 2019, 07:22:48 pm
content: That looks interesting... remember I saw a few FT232 in my drawer... will definitely look into this tomorrow.I think the A only did 9600bps (don't quote me on that though) and might be physically different so it won't fit some instruments.Thank you so much!//Greg.
Unitrend UPO3000E oscilloscope - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: February 01, 2019, 10:36:07 pm
content: Unitrend released a new scope named UPO3000E.http://en.uni-trend.com.cn/index.php?m=content&c=index&a=show&catid=292&id=85I wonder if it will be sold outside China.

author: ataradov
author_rank: Super Contributor
timestamp: February 01, 2019, 11:09:22 pm
content: Good to see a Chinese scope that does not look like a pile of garbage.Any pricing info?
Wavetek/Fluke signal generator model 80 User/Service manuals? - Page 1
Forum section: electronics / testgear

author: DenJohX
author_rank: Newbie
timestamp: April 29, 2018, 04:53:39 am
content: Hi, just got my hands on a wavetek model 80 signal gen. Since wavetek was aquired by fluke they released the same just rebranded model:https://us.flukecal.com/products/obsolete-products/8081-function-pulse-generators?quicktabs_product_details=2It looks good and it does works great on sin up to the 50Mhz. The square and triangular waveforms works ok up to 5Mhz then they turn into almost sinusoidal... But hey I got it for cheap.The buttons feels great, very tactile. and it has a good set of functions, configurable sweep, AM, FM, PLL, etc.It does get very warm after 15min or so even when its very noisy fan is going full speed, will change it for shure, haven't tested if that makes it drift.The UI in general is very intuitive, but I can't find how to use some of the funcionality, wich gets me to the main question: Does anyone has the user/service manual of this gen? There is a donwloadable version in the fluke site but its just the intruduction and nothing else...Thanks in advance!

author: Fred_47
author_rank: Contributor
timestamp: January 24, 2019, 04:41:58 pm
content: Quote from: DenJohX on April 29, 2018, 04:53:39 amDid you find out why it seems hot?I found a free manual athttps://www.lost-manuals.com/equipment.php?id=19313

author: coromonadalix
author_rank: Super Contributor
timestamp: January 25, 2019, 12:54:50 am
content: Does look a like Racal Dana stuffMany different voltages in the psu, i would check all the psu capacitorsThe fan has no thermal control ??Nice find Fred_47

author: Testtech
author_rank: Regular Contributor
timestamp: February 01, 2019, 10:14:09 pm
content: These were made by Tabor, Fluke sold them as well.Note that the fan is critical, as the output amplifier runs REALLY HOT!
is x100 oscilloscope probe suitable for measure 5v digital circuit? - Page 1
Forum section: electronics / testgear

author: Porama6400
author_rank: Regular Contributor
timestamp: January 31, 2019, 09:23:51 am
content: is x100 oscilloscope probe suitable for measure 5v digital circuit?Are there any drawback doing that?

author: Porama6400
author_rank: Regular Contributor
timestamp: January 31, 2019, 09:35:08 am
content: Do high voltage probe got faster respond time?If I just want to see brief voltage spike, is it going to work?

author: Hydron
author_rank: Super Contributor
timestamp: January 31, 2019, 12:10:40 pm
content: I'd normally recommend 10X probes for logic level stuff for noise reasons, but sometimes a 100X probe can be very useful to poke at sensitive nodes - they typically have significantly less capacitance than a 10X probe so disturb the circuit you're measuring less.For general use a 10X probe is cheap enough that it's probably best to get some.

author: Fungus
author_rank: Super Contributor
timestamp: January 31, 2019, 02:03:43 pm
content: Quote from: Porama6400 on January 31, 2019, 09:35:08 amYes.

author: Porama6400
author_rank: Regular Contributor
timestamp: February 01, 2019, 10:58:23 am
content: So x100 probe will be more noisy but will have have lower interference?

author: Fungus
author_rank: Super Contributor
timestamp: February 01, 2019, 01:50:27 pm
content: Quote from: Porama6400 on February 01, 2019, 10:58:23 amlower capacitance.

author: Porama6400
author_rank: Regular Contributor
timestamp: February 01, 2019, 02:39:45 pm
content: oh yea, my bad
Banana plugs to fit 34401A - Page 1
Forum section: electronics / testgear

author: rhb
author_rank: Super Contributor
timestamp: January 23, 2019, 01:14:21 pm
content: I just discovered that these are "special"As it happens my favorite test leads with the *really* sharp tips fit properly, so I never noticed the issue. But all others either don't fully seat or leave exposed metal.So what fits? I spent a long afternoon searching without success. Either they did not fit or the drawings didn't give the critical dimension. The insulator at the end of the plug needs to be under 0.330". The ones I have that fit are 0.321" at the plug end and then taper to 0.400" at the wire end. I'm looking for tin plated 4 or 8 spring phosphor, bronze or beryllium copper in solder style.

author: Stray Electron
author_rank: Super Contributor
timestamp: January 31, 2019, 10:20:22 pm
content: We're using a cheap set of leads from Marlin P Jones and they work fine on our 34401A.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 31, 2019, 10:26:11 pm
content: I have a set of original Agilent probes which seem to fit fine. The leads are a little thick, but very usable. The instructions say the following "This Test Lead Set is designed for use with the Agilent 34xxxA Multimeters, and also the U2741A, U3401A, and U3402A Multimeters."https://www.keysight.com/en/pd-826347-pn-34138A/test-lead-set?cc=NL&lc=dut

author: rhb
author_rank: Super Contributor
timestamp: February 01, 2019, 02:53:12 am
content: I have a pair of cheap , *very* nice probes. But I want to be able to use the instruments in custom applications, for which banana plugs which fit properly are essential.
Extech MN62-K just a Uni-T UT139C? - Page 1
Forum section: electronics / testgear

author: jayjr1105
author_rank: Regular Contributor
timestamp: February 01, 2019, 05:39:56 pm
content: Shell seems identical and range switch/options are very very close.Was debating on a Extech MN62-K as a secondary meter but it's $65 compared to $40 for the Uni-T
UNI-T UT139E Problem - Page 1
Forum section: electronics / testgear

author: Travie21
author_rank: Newbie
timestamp: January 31, 2019, 03:11:45 am
content: Good Day guys,I would like to ask whats the problem of my meter. I accidentaly plugged it on AC while it is on Resistance mode. Now, the resistance on the display flickers from 0000 ohm to OL. I can still read resistance from 1-1k ohm, but can't read higher like mega ohms. I doubt if it's still accurate. Contuinity and diode test still works fine but the capacitance test is not working. Its stocked on microfarad, unlike before its on nano farad. AC and DC voltage also still works well but DCmV is indicating high voltage while displaying OL. NCV also does not work now. I checked the fuses but both still works well. I check the contuinity on the Voltohm jack to 10A, its still beeps but on mA jack does not have continuity. Just like the manual says. I'm an electrical major and I'm just new to electronics. I dont have any idea to diagnose my problem. Hope you can help me guys.Thanks!

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 31, 2019, 01:48:45 pm
content: https://www.eevblog.com/forum/testgear/ut139e-and-ut139s-digital-multimeters-no-discussion/25/?topicseen

author: Fungus
author_rank: Super Contributor
timestamp: January 31, 2019, 01:59:43 pm
content: You killed it. Time to learn from what you did wrong and move on.(...and not create duplicate threads hoping somebody will say something different).Quote from: Travie21 on January 31, 2019, 03:11:45 amIf you're interested in finding out the exact cause of death you could watch the series of videos that were created in this thread, watch what joe does after he kills a meter.https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/nb. There's a lot of talk there, you might want to go directly to joe's Youtube channel.
OEM for Meters - Page 1
Forum section: electronics / testgear

author: JtroTechAB
author_rank: Contributor
timestamp: January 24, 2019, 09:35:58 am
content: Looking for OEM for Benchtop Multimetersspecs: 5.5 digit and aboveshould have data logging feature.Also,OEM for Clamp metersspecs: 400A to 600ATrue RMSDuring search, I went through various models available in marketbut either they are too expensive or the reviews are not so good.thats why emphasizing on OEM where I hope I can get both economical and with nice reviews.please help, very confused.

author: BravoV
author_rank: Super Contributor
timestamp: January 24, 2019, 09:39:04 am
content: Max. budget ?

author: JtroTechAB
author_rank: Contributor
timestamp: January 24, 2019, 11:29:47 am
content: Max budgetFor clamp meters 100 USD to 120 USDFor Benchtop multimeters 150 USD

author: The Soulman
author_rank: Super Contributor
timestamp: January 24, 2019, 11:48:11 am
content: Maybe rishabh?http://rishabh.co.in/

author: JtroTechAB
author_rank: Contributor
timestamp: January 29, 2019, 04:21:20 am
content: Any OEM, any economical & reliable models.any china make for that matter will also do.

author: JtroTechAB
author_rank: Contributor
timestamp: January 31, 2019, 03:45:09 am
content: Any suggestions?
HP 8643A vs. 8644B? - Page 1
Forum section: electronics / testgear

author: 0culus
author_rank: Super Contributor
timestamp: January 28, 2019, 06:47:46 pm
content: Been looking at better performing RF sig gens to replace my 8657A. Other than the seemingly very high prices commanded by 8644s, what are the meaningful differences between these units?8643As seems to be quite more hobbyist budget friendly. I do understand that they are massively heavy, though most of my test gear seems lightweight after getting an 8568B.Potential other options? I definitely want sweeping, which the 8657 cannot do.

author: 0culus
author_rank: Super Contributor
timestamp: January 29, 2019, 06:36:02 pm
content: Decided to look at 8664A's too. Not a whole lot more bones for more signal generator.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: January 29, 2019, 08:32:01 pm
content: I really really wish that someone would take to the chore of making a nice large spreadsheet of them all.Ok, frequency range, output level from/to and modulation types are easy. But it should include not only more parameters, but also non-numerics like input method, type/size/number of displays, sweep y/n, etc.If someone started it, I would contribute some data.Focus on HP and R&S, then spreading to the remainder?

author: 0culus
author_rank: Super Contributor
timestamp: January 29, 2019, 08:35:36 pm
content: Once I have more time on my hands (give me a few months) that might be fun to do!

author: siggi
author_rank: Regular Contributor
timestamp: January 29, 2019, 10:20:26 pm
content: Quote from: 0culus on January 28, 2019, 06:47:46 pmHere's a document that compares the 8643A-8665s.https://www.atecorp.com/atecorp/media/pdfs/data-sheets/hp-agilent-8643a-44b-64a-65ab_datasheet.pdf.I'd guess the 8644 is expensive because it has much lower phase noise than the 8643A - which was the "budget" generator of the series. Note that the sweep on these is discrete, these generators only do narrowband continuous-phase sweep.

author: 0culus
author_rank: Super Contributor
timestamp: January 29, 2019, 10:38:19 pm
content: Yeah, looks that way. I'm looking at an 8664A right now. Has 3 GHz, so it covers a little more spectrum.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: January 29, 2019, 11:52:04 pm
content: Ok, I ought to see it when this thread is updated or trigger me by PM, I'll gladly enter what I have.
Speaker impedance  tester or  LCR  bridge? - Page 1
Forum section: electronics / testgear

author: xugmu
author_rank: Contributor
timestamp: January 22, 2019, 09:38:20 am
content: Hello, I almost needed to buy a 100v speaker impedance tester and I was thinking, buy me a LCR bridge instead.I would appreciate if someone could tell me if, measuring the reactance and resistance of the 100v speakers and calculating its hypotenuse is enough to obtain the value of the impedance. A LCR bridge , after all, is much more useful than an speaker impedance tester, on all for the measure of esr in circuitI currently have capacitance and normal inductance meter but I get the impression that, although I apply the formulas 2nfl and 1 / 2pfc, although I put 1khz on the frequency, I will not get what I wantBest regards

author: xugmu
author_rank: Contributor
timestamp: January 29, 2019, 06:47:12 pm
content: A very interesting topic this the impedance of the 100v speakers

author: trobbins
author_rank: Frequent Contributor
timestamp: January 30, 2019, 10:52:15 am
content: You can also use a soundcard test rig, such as REW provides.

author: toli
author_rank: Frequent Contributor
timestamp: January 30, 2019, 11:15:51 am
content: LIMP (ARTA) using a sound card is also a valid option which many people use.
What High resolution power supply to buy? - Page 1
Forum section: electronics / testgear

author: FriedMule
author_rank: Frequent Contributor
timestamp: January 29, 2019, 04:21:44 pm
content: I would like to buy a new fairly low voltage PSU with high adjustable resolution in the 100uV range or better, any advice?

author: David Hess
author_rank: Super Contributor
timestamp: January 29, 2019, 08:49:15 pm
content: Even source meters from companies like Keithley do not have that kind of performance and they are expensive. Did you have a budget in mind?

author: colorado.rob
author_rank: Frequent Contributor
timestamp: January 29, 2019, 09:48:28 pm
content: Keysight B2912A will do the business.

author: DaJMasta
author_rank: Super Contributor
timestamp: January 29, 2019, 10:03:47 pm
content: Definitely sourcemeter territory, the newer Keithley 2450 has a 500nV source resolution, but the noise figure is big for that setting level. Also that's only on the lowest range which tops out at 20mV.Are you sure you need nV accuracy in the source? It's easy to get a meter with that kind of resolution, but getting a constant voltage source of that caliber is tricky. Easier to do a precision current source (the same Keithley meter mentioned earlier can set currents with a 500fA resolution, 10^6 times finer steps).

author: FriedMule
author_rank: Frequent Contributor
timestamp: January 30, 2019, 02:34:18 am
content: Wary sorry, did hit N where I wanted to hit U as in micro instead of wrongly nano or better.
SIGLENT SDS1104X-E first time in Arabic Language - Page 1
Forum section: electronics / testgear

author: MMDuino
author_rank: Regular Contributor
timestamp: January 29, 2019, 09:48:33 pm
content: Dear EEVblog members, (especially Arabic people), I wish you could see and watch my YouTube channel, it will be very interesting channel in Arabic Language (Iraqi accent),https://youtu.be/zSuRfwSveIQI hope such post will not be considered as a violation post, I believe there is no such rules in Dave's world
How to set high & low measurement limits on Siglent DMM? - Page 1
Forum section: electronics / testgear

author: DonpK
author_rank: Newbie
timestamp: January 28, 2019, 05:48:33 pm
content: I have a Siglent SMD3055 DMM. Is there a way to set high and low limits when measuring various parameters?For example, I have a series of 1.5 volt batteries. I would like to set up the meter so only records and ideally beeps, when the measured voltage is between 1.45v and 1.55v. Is there a way to do this?

author: BillB
author_rank: Unknown
timestamp: January 28, 2019, 06:07:31 pm
content: Press the Math button, then Limits. Though, I believe it will only record and beep when the defined limits range has been exited.

author: DonpK
author_rank: Newbie
timestamp: January 28, 2019, 06:38:16 pm
content: Thanks, Bill.You're right, the meter beeps when the measurement isoutsideof the limits, not within the limits. So if a series of 10% resistors of the same value is being measured and the limits are set to ±2%, the meter beeps for most of the resistors measured and remains quiet for the resistors within the limits. The opposite operation would seem to be more useful - beep only when within the range.
BM257s  RELative zero mode (delta) - Page 1
Forum section: electronics / testgear

author: negative_feedback
author_rank: Contributor
timestamp: January 29, 2019, 07:51:25 pm
content: Hello, I was playing around with this meter and its the only one I have that doesn't "zero out" instantly when in REL mode. Instead, its slowly counts down towards 0.0 and then it kinda stays put, after I restore normal mode it will climb back up in same amount of increments.I tried to confirm its accuracy with some 200/202 resistors and it was maybe even too accurate. Is it normal for compact DMMs to be lagging like so (tried to find some videos but they usually show this on 800 series)?PS It is Welectron. branded Edition+ with premium Brymen leads. They show 0.0 or 0.1 resistance so I never needed to zero that out really... unless 257s is totaly of the mark.
Marconi IFR 623x sensor - Page 1
Forum section: electronics / testgear

author: Ice-Tea
author_rank: Super Contributor
timestamp: January 28, 2019, 02:11:22 pm
content: Anyone roughly in my neck of the woods that has one and that's either willing to lend/rent or sell one, preferably cheaply?

author: Ice-Tea
author_rank: Super Contributor
timestamp: January 29, 2019, 10:26:44 pm
content: Bumptedy Bump?
X-Pos on Hameg HM5014-2 Spectrum Analyser - Page 1
Forum section: electronics / testgear

author: Rod___
author_rank: Newbie
timestamp: January 27, 2019, 12:25:56 pm
content: Hi,I have a Hameg HM 5014-2 SPectrm Analyser. The unit works fine but the beam position in the X-axis is off by about 2mm. i.e. the Centre frequency is 2mm to the left of the centre graticule line. This is also seen when viewing the centre line of the trace-rotate pattern. Of course this doesn’t make the unit inaccurate in any way but it is annoying.I have the service manual but the only trimmer I can find relating to ‘X’ is the X-Gain. There are also trimmers for Astig and Intensity. These are all on the XYZ Board (Page 50 of the service manual).X-Pos is mentioned on page 48 but that is just a fixed potential divider in the X-Final Amp. nothing appears to be adjustable. Please see attached.Any help in pointing me in the right direction would be really appreciated.Best RegardsRod

author: TurboTom
author_rank: Super Contributor
timestamp: January 27, 2019, 11:55:33 pm
content: It's on the digital control board, see attachments.Cheers,ThomasP.S. C21 at the output of the buffer opamp is REALLY awkward, seems like someome didn't know what he's doing there. This designer must have been lucky that it worked like that anyway...

author: Rod___
author_rank: Newbie
timestamp: January 28, 2019, 04:10:12 pm
content: Hi Thomas,Many many thanks, the beam is now centred.Do you happen to know if P1, to the left of P2 on the main board schematic (page 38) is the trimmer for the marker position. If I can get that to be reading the centre frequency when it is on the centre frequency then everything will be correct.Thanks again.RodP.S. to your P.S. I'm still very much a learner, I can't see the problem with C21. I assume it just takes any parasitic oscillations to ground leaving the op-amp to funtion correctly as a follower before the next stage. The op-amp is only dealing with DC input. But I'm probably completly wrong

author: TurboTom
author_rank: Super Contributor
timestamp: January 28, 2019, 04:47:40 pm
content: Rod -This P1 thing rather looks like an X slew rate adjustment to me. Apparently, the X/Y amplifiers consist of a quite interestingly designed resistive A/D converter each and a discrete sample/hold ciruit, followed by a switchable slew-rate amplifier (integrator to be able to display lines and not only dots...). But that's my understanding of the circuitry without going further into detail. Since both the X position of the SA trace and the positions of the cursors are generated by the computer section, it shouldn't be necessary to separately calibrate the cursor position. These half-analog half-digital designs of the '90s can be bitches to troubleshoot. But then again, with the (usually available) schematics and some brain exercise, at least in most cases that's possible while more modern, fully digital systems are mostly just "black boxes"...Good luck and all the best,Thomas
How to disable Parallel ASC on 1054Z - Page 1
Forum section: electronics / testgear

author: adauphin
author_rank: Unknown
timestamp: February 03, 2019, 05:11:00 am
content: I haven't spent much time with this scope, forgive me if I've overlooked something obvious.The green bar on the lower 3rd of the display (Parallel ASC)....can you tell me how to turn it off....Thanks

author: Kean
author_rank: Unknown
timestamp: February 03, 2019, 05:23:21 am
content: Press Math, then Decode1, then change Decode to OFF

author: adauphin
author_rank: Unknown
timestamp: February 03, 2019, 05:34:36 am
content: I did try that. If I turn decode on, I get another green bar below that one.

author: adauphin
author_rank: Unknown
timestamp: February 03, 2019, 05:54:18 am
content: Daggone....lol, been a long day.Was under decode 2...All is good.

author: Kean
author_rank: Unknown
timestamp: February 03, 2019, 06:17:35 am
content: Ah yeah... I almost mentioned that, but glad you worked it out yourself. I couldn't quite read the flag to see if it was labelled B1 or B2.Edit: It is just legible in the 2nd photo.
arbitrary FeelTech FY2300h - Page 1
Forum section: electronics / testgear

author: Jan80
author_rank: Newbie
timestamp: January 27, 2019, 10:50:14 pm
content: Hi I recently purchasedFy2300h /50Mzversion for about AUD110 and I'd like to share some thoughts about it. Functionality is similar to well discussed FY6600 an FY6800 models. The main difference is 5V supply and the metal case which makes it more suitable as a carry on service device supplied of 5V/800mA USB power bank.HW- The FY2300H is claimed to be 14bit / 250MSa/s ... but it's based on Altera FPGA EP4CE6E22C8N with maximum operating frequency 200Mhz and two MCP4822 12bit, 20Mhz SPI DAC.Measured frequency response 1Vpp sinus drops just 15mV at 50Mhz, Rise and fall time about 6ns @1Vpp 10Mhz square. Signals over 5Vpp are limited to 20Mhz. Modulations are available for Ch1 only.Vertical resolution was confirmed to be just 12bit. VCO input to be 5VDc for full scale, but my unit needs 6VDc - not sure if it's feature or a bug of my unit. USB connector is for data only.Build qualitycould be better, there is loose top panel and chassis to reference "ground" (supply DC negative) connection is done by a piece of stripped wire squeezed between anodised panels. Scratch them at point of contact at least, 4mm ground post can be easily add.HMI- responsive and easy to work with, nice display.PC software- same as for 6600/6800 model - installation wasn't easy on 64bit win (missing VB library..). PC sw crashes randomly, custom curve cannot be defined as sequence of x,y point matrix. draw feature is useless, however there are some predefined signals which can be combined (+-*).Overall- it works, but ...
Rigol AWG glitches during freq or amplitude adjustment- alternatives ? - Page 1
Forum section: electronics / testgear

author: glenenglish
author_rank: Frequent Contributor
timestamp: January 29, 2019, 01:55:20 am
content: I've had a Rigol DG1022 for years and years. handy and cheap.However when adjusting (by the jog wheel) amplitude or frequency, the output can glitch momentarily, freq or amplitude to almost anything. a gap of nothing, 2x, all manner of variations.Which is fine until you are adjusting something that might overload and latch that way. or go out of lock when say adjusting some lock in range, just because the generator was not continuous.QUESTION- Are the newer Rigol (and Sigilent) AWGs the same, do they have this bad behaviour ? A friend of mine has a Tek AWG, and it is well behaved.-glen.

author: TurboTom
author_rank: Super Contributor
timestamp: January 29, 2019, 06:23:47 am
content: Actually, that's one of the biggest complaints that I have about most of the digital AWGs. Actually, I cannot say that it's the same situation with all of them, it depends on many details. For example, with sine and triangle waveform, the Rigol DG4000 is quite well behaved while it messes up completely at anything with "steep" edges, i.e. square and ramp. Similar situation with the new(ish) Siglent SDG6000X series. When configured in phase coupling mode, it even messes up sine wavefoms. Siglent announced to sort that problem with the next firmware update but it's already been a long wait... I've got an "el cheapo" AWG (Hantek HDG2002B) that behaves surprisingly well, yet it's got other issues. I guess it all comes down to the fact that (most of) these machines don't utilize double-buffering the waveforms to be "played back", so if the waveform memory needs to be updated during adjustment, it glitches. Instead, the memory should be arranged as two buffers shadowing each other and only the buffers get switched at points of equal amplitude after the configuration of the new waveform is complete. I may be over-simplifying things here since I never designed an AWG but the direction of thinking should be appropriate...Many AWGs also have usability issues that make them vitually useless at eyes-off operation (i.e. watching the screen of other T/M equipment while doing adjustments). Why not provide pre-programmable limits for the adjustment range of the rotary encoder? Fixed increments would be nice also and not that digit-jumping cursor rubbish if the decimal multiplier changes or the end of a range is reached?Clearly most AWG design teams have apparently never asked any users...
Rigol 3058E SCPI Calibration exploration - Page 1
Forum section: electronics / testgear

author: bveina
author_rank: Newbie
timestamp: January 27, 2019, 10:09:23 pm
content: ive been looking into calibrating the Rigol 3058E via SCPI commands and my fluke multi function calibrator, and been told its impossible by a rigol rep. i found that dubious at best. and began poking around in the firmware file for likely options.ive found some commands that seem to be related::CALIbration:STEP:CALIbration:STATUs?also there are keywords ZERO, and GAIN, but i cant fit them into any working commands yet.:Calibration:step takes an argument and returns a string "CALIBRATION Step %d"and querying :calibration:status? will be 1\n until some calibration measurement is finished. but this is where i hit a stumbling blockive confirmed that each range is unaffected by other range calibration operation, so to start i focused only on the 200mV range as a testCode:#pythondmm.write("*RST")dmm.write(":MEASURE:VOLT:DC 0") #200mV rangecal.write('OUT 0V')dmm.write(":CALI:STEP 0")while (dmm.query(":CALI:STATUS?") ==1): time.sleep(1)when this finished running, the lcd displays a pretty good 0V reading +- 2 counts.also if you redo this with the output set to 50mV, and then readback across the entire range, there will be a 50mV shift in the readings. however the shift is only between -60mV and +60mV, -200->-61 and 61->200 are unaffected."STEP 1" only gives reasonable results if you provide 0V on the inputs as well. any other values give the same shifted behavior that would appear if you gave non-0Volt values for step one.ill continue to document my findings but i thought i might reach out here for help. i'm cleaning up my python to share so other people can replicate my work if there is interest.anyone else had a go at this?PS:other undocumented commands ive stumbled across::WINDow:STATus? - no clue what window this is talking about...:BOARdtest:MEMory:FLASh?:BOARdtest:MEMory:SDRAM?:BOARdtest:MEMory:FRAM?
Rto1022 - Page 1
Forum section: electronics / testgear

author: dmendesf
author_rank: Frequent Contributor
timestamp: January 27, 2019, 05:27:15 pm
content: I have a rto1022 that has a crashed HD. Does anyone have an image to share?

author: KaneTW
author_rank: Frequent Contributor
timestamp: January 27, 2019, 05:42:03 pm
content: Ask R&S. They usually have very good support even for secondhand unite.

author: Jackob
author_rank: Contributor
timestamp: January 27, 2019, 07:26:03 pm
content: Hi. I have a back up copy of the image for RTO-1004/Win7. If you still need it, send me a PM. I won’t be able to deliver it (probably via some dropbox account) to you untill monday evening (EU time).Br, Jackob
Warranty period on test equipment - Page 1
Forum section: electronics / testgear

author: jpb
author_rank: Super Contributor
timestamp: January 26, 2019, 05:03:26 pm
content: I recently was looking at the GW Instek 9300B spectrum analyser as it was on a discount.I was a bit shocked though to find that GW Instek's warranty period is only 1 year. I thought almost everyone had a 3 year warranty now-a-days.A quick check via Farnell showed that Keysight, Rigol, Siglent, Rohde & Schwarz, AIM TTi and Tektronix all have a 3 year warranty.Signal hound is another exception with a 2 year warranty (according to their web site).I am a bit puzzled as to why GW Instek don't fall in line with the rest of the market. It certainly put me off buying as it seems to indicate a lack of faith in their own products, besides which given the expense of repairs on high tech equipment one year's cover seems very short.
Rigol DP832 Dial Sensitivity - Page 1
Forum section: electronics / testgear

author: eev_carl
author_rank: Regular Contributor
timestamp: January 26, 2019, 02:46:07 am
content: Hi,When I adjust the voltage with the dial on the DP832, it goes up by millivolts. Any way to make this go up and down by volts?Thanks,Carl

author: JDubU
author_rank: Frequent Contributor
timestamp: January 26, 2019, 04:18:53 am
content: Use the left and right arrow buttons (on each side of the dial) to select the digit that you want the dial to increment/decrement.

author: eev_carl
author_rank: Regular Contributor
timestamp: January 26, 2019, 04:21:58 am
content: Perfect! thanks
DE5000 LCR meter displaying uH instead of mH - Page 1
Forum section: electronics / testgear

author: adauphin
author_rank: Unknown
timestamp: January 25, 2019, 07:33:12 pm
content: Having just purchased a DE5000, I performed the CAL and when measuring a .875 mH inductor, the meter is displaying 885 uH. Granted it needs to be unwound slightly but curious if that is normal or a setting I can change.

author: HKJ
author_rank: Super Contributor
timestamp: January 25, 2019, 07:39:40 pm
content: What is the question 0.875mH is exactly the same as 875uH?I would say that 875uH is the preferred way to show the value.

author: adauphin
author_rank: Unknown
timestamp: January 25, 2019, 07:52:01 pm
content: Either way is fine, I wasn't aware that uF was the preferred way but was only curious if the meter has a mH display option if it should or should not be displaying it.

author: HKJ
author_rank: Super Contributor
timestamp: January 25, 2019, 08:21:20 pm
content: Anything between 1mH and 10m can either be displayed as 1000uH to 10000uH or as 1mH to 10mH, but above 10mH I would expect the meter to show mH.With the SI prefix* you do not really expect values below 1, they use the next lower prefix, between 1 and 10 it is more or less optional (Depending on who you ask) if you use the lower prefix or the current prefix, above 10 you always use the current prefix.*Why is it called prefix when it is after the number: It is because it is a addition to the unit, i.e. H has a prefix of m or u.
Silent Switcher based lab bench power supply designs/kits? - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: January 28, 2019, 03:57:06 pm
content: I studied thishttps://www.analog.com/en/technical-articles/high-performance-portable-dc-bench-power-supply.htmlwith great interest.Are there any kits/pcb:s/whatever for lab bench power supplies designed along those lines? Hopefully with dual tracking outputs.I tried looking, googling and such, to no avail.
What is the Jaycar QC-1932 25Mhz Oscilloscope? - Page 1
Forum section: electronics / testgear

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: January 25, 2019, 04:31:58 am
content: https://www.jaycar.com.au/25mhz-dual-trace-digital-storage-oscilloscope/p/QC1932Ignore the above listing completely, as that's no longer the version scope they're selling with that part number...I've just bought one today, and it is in fact a Siglent model, compared to the previous Atten. (same same, but different)I believe it to be an sds1022dl, but have had no luck identifying the scope via RS232, and the screen seems higher resolution than specified for this unit.I'm hoping to update the firmware, but I'm not sure if it'll take the Siglent stuff, or what will happen if I try the wrong firmware?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: January 25, 2019, 04:44:11 am
content: They are a rebranded Atten, made by Siglent.5 or 7" display ?Does it have a LAN port, if so it's the DL+ model and LAN and higher res display were the upgrades from DL models.Ch 2 trace color was also changed from blue to cyan.Be treble sure before you use any Siglent FW that the FW versions have similar #'s and format to what is displayed in the System page.

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: January 25, 2019, 04:48:00 am
content: 7 inch display, has ethernet.The DL+ thing explains the screen then
Cypress kit - Page 1
Forum section: electronics / testgear

author: Andbro
author_rank: Regular Contributor
timestamp: January 24, 2019, 10:38:15 pm
content: Hi,Can I use this module like logic Analyser with Pulseview?If yes, which is the good driver?Thanks

author: ebclr
author_rank: Super Contributor
timestamp: January 24, 2019, 11:03:05 pm
content: You can,https://majek.sh/en/logic-analyzer/
Safe use of oscope for measurements of PC-connected USB-powered microelectronics - Page 1
Forum section: electronics / testgear

author: luma
author_rank: Regular Contributor
timestamp: January 24, 2019, 02:18:12 pm
content: My scope (1054Z, waiting for MSO5074 to ship!) is almost 100% used to check signals and levels on microcontroller projects under development. In nearly all cases, the power and debug/communications data is provided by a single USB cable attached to my desktop PC which is earth grounded. There is a powered USB hub in the middle which is not grounded. The scope, hub, and PC are plugged into the same mains supply on the same circuit.My problem is that I'm occasionally having problems with the USB hub going offline during normal use (meaning, I didn't just plug something into something, connect probes to a new location, etc) and I need to power cycle the hub to get it working again. That was up until I just recently toasted one entire hub and several ports of another. I suspect I might be doing something stupid here.Most of my projects involve ESP8266/ESP32 and I typically have a UART included in the project for easy programming and simple printf debug over serial. The devices are all low power and fit within the 500ma afforded by USB.Reading some reviews of the USB hubs I have (had), I've found that other people have had them randomly quit working, so maybe my setup is OK and it's just a crappy hub doing what crappy hubs do.Is what I've outlined above safe? Is there a better approach I should be taking here?

author: Bassman59
author_rank: Super Contributor
timestamp: January 24, 2019, 04:37:47 pm
content: Quote from: luma on January 24, 2019, 02:18:12 pmCrappy hubs are common. Get another. I've never seen a USB hub with a grounded (three-prong) wall wart.QuoteI'm not sure what you mean by "safe," but my desk and bench are covered with cables and such. There's a USB hub from my PC on my bench which has various dongles attached. The scope, a lab power supply and other stuff all variously connected. A USB cable goes from the PC over a low wall to another set-up, and I'm pretty sure the stuff on that bench is powered by a different mains circuit. (The building mains AC here is solid.)Anyway, your problem is that either your hub is crappy (likely), the cable between the computer's host port and the hub is crappy, or there's a problem with the computer's port. Try another.
Agilent E3631A Missing Fuse/Voltage Selection Insert. - Page 1
Forum section: electronics / testgear

author: Airnautique
author_rank: Newbie
timestamp: January 24, 2019, 05:36:41 am
content: Hello all,New to the forum so feel free to be hard on me for making any mistakes.I recently got an agilent e3631a supply out of my works scrap bin. I'm hoping to fix it and use it on my own bench. However, it is missing the piece that holds the fuse in and selects the voltage. Before I go and solder in a fuse, I'm hoping someone could point me to a replacement part.Photos of the where the missing part goes.https://imgur.com/a/0fn2wt9Thanks for your time.
Looking for a good LCR meter under $300 - Page 1
Forum section: electronics / testgear

author: adauphin
author_rank: Unknown
timestamp: January 23, 2019, 11:59:40 am
content: Just curious if the DE-5000 is still a nice beginner LCR meter for the price. I would like to measure speaker inductor coils, resistors, etc and I'm after accuracy as I will need to wind down inductors.For the price the DE5000 seems to fit the bill, but not sure what's out there that's worth spending $$ on.Any input appreciated.

author: Calvin
author_rank: Regular Contributor
timestamp: January 23, 2019, 02:24:20 pm
content: Hi,You may have a look at ebay for XJW01 (2017 or better 2018 version).A very precise meter, easy to use and very good value for Your money.I´d suggest to buy the offers including the Kelvin Clips, Kelvin-Tweezer and foldable stand for ~80-90€.regardsCalvin

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 23, 2019, 06:34:37 pm
content: Quote from: adauphin on January 23, 2019, 11:59:40 amHaving owned the DE-5000 for several years now, it will easily handle what you mention and still is one of the value leaders. It has precise selectable frequencies for testing (100Hz, 120Hz, 1kHz, 10kHz, 100kHz) and has very good precision and accuracy. While not common, the 100kHz setting is really useful when diagnosing capacitors in a switching supply and reading low value inductors.Additionally, I like that the manual breaks down the exact accuracy and precision for all of the combinations of range, frequency, measurement type; unlike the no-name instruments. This is really useful for knowing your error bars on any measurement you make.The only other value leader are the $20 transistor component testers. They are accurate enough for most hobbyists, though you don't necessarily know HOW accurate. They are also cheap as dirt (most run well less than $20 now) and provide a number of extra functions.I actually have both and use each in specific situations.

author: adauphin
author_rank: Unknown
timestamp: January 23, 2019, 10:12:52 pm
content: Thank you for the replies.This is what I went with:DE-5000 Handheld LCR Meter with accessorieshttps://www.amazon.com/dp/B00S298KJO/ref=cm_sw_r_cp_apa_i_SyosCbDRVXEXCAny other options/accessories you feel I could use, please feel free to chime in.Thanks again.

author: bugi
author_rank: Regular Contributor
timestamp: January 24, 2019, 08:45:50 am
content: Depending on the level of interest, you could google for "DE-5000 kelvin clips" (or similar), quite a few hobby projects for making such with one of those accessory boxes, clips, BNC connectors (or without connectors).
Appropriate kelvin clip wiring for Genrad 1689M - Page 1
Forum section: electronics / testgear

author: ezalys
author_rank: Frequent Contributor
timestamp: January 23, 2019, 03:00:11 am
content: Hey all,I’m curious what the proper way to wire kelvin clips for my genrad 1689M, specifically I’d like to understand what to do with the outer conductor of the BNC connectors. Do I use coax and just leave the shielding disconnected? Do I short the shields inside the clip? Do I just use plain wire and connect to the center conductor itself at the bridge?

author: coromonadalix
author_rank: Super Contributor
timestamp: January 23, 2019, 11:24:02 pm
content: Check if the outer bnc plugs are grounded together, if so you use the inner bnc pins for the kelvin clips and the 4 wires shield is put together near the kelvin end clips, to provide the shielding.And if you equipment permit it, you null /zero out the value by shorting the kelvin clps together