hybridfree/eevblog-posts huggingface dataset:
Rigol DP832 startup problem - Page 1
Forum section: electronics / testgear

author: unimorpheus
author_rank: Regular Contributor
timestamp: January 14, 2016, 06:38:30 am
content: I just recently received (Jan. 2016) a Rigol DP832 Digital ver. 00.01.14.00.03, Analog ver. 03.02.04.03.02.04 and bootloader 01.09. I have noticed a strange readback problem on startup no load. I have searched the forum looking for a resolution and possible calibration fix but have not found anything specific to my problem. In short when I power the unit up and activate the channels I get:No load everything zeroed.CH1show 10mV, 0A, OWread 4.2mV, 2.25mACH2show 2mV, 1mA, 0Wread 4.7mV, 2.63mACH3show 2mV, 3mA, 0Wread 1.6mV, 0.85mAReading from a Fluke 87 (yeah, an original like new 87)These errors will carry forward as input values are adjusted. I understand (to some degree) the limits of the unit accuracy but it just bugs me that I cannot set to unit to read zero at startup. The 1 or 2 mV hear or there is no big deal but the 10mV on CH1 really bugs me. Any way to fix?

author: H.O
author_rank: Frequent Contributor
timestamp: January 14, 2016, 09:43:12 am
content: Hi,The specifications claims the set voltage accuracy is 0.05%+20mV so if have an offset between set voltage (0V in this case) and "actually" voltage on the output (4.2mV in this case) of 4.2mV you're still well within its specification. The readback is specified to 0.05%+10mV so the 5.8mV difference between what the DP832 shows (10mV) and what you "actually" have (4.2mV) is also well within spec. It looks perfectly fine to me.If you look at the first post in theDP832 Firmware Updates and Bug Listthread you'll find links to documents describing how to calibrate it if you really feel you want/need to do that.

author: unimorpheus
author_rank: Regular Contributor
timestamp: January 14, 2016, 07:07:46 pm
content: Yeah I figured it was within spec, I just think it is strange that Rigol would offer a precision update that reveals the unit's accuracy limitations. Starting up with a 10mV reading error does not inspire a great deal of confidence. I will look at the calibration information you mentioned. Thank you.
DMM like BM857S that also have inductance measurement? - Page 1
Forum section: electronics / testgear

author: MT
author_rank: Super Contributor
timestamp: January 13, 2016, 11:30:26 pm
content: Are there any DMM around with specs similar to BM857S that also have inductance measurement?Thanks!

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 13, 2016, 11:35:39 pm
content: Quote from: MT on January 13, 2016, 11:30:26 pmInductance is a VERY specialized measurement. Most meters that include it do it badly, giving values that are more or less only qualitative at beast, not quantitative. Only one set of meters that I know of does both DMM and proper LCR at the same time. That's the Der EE DE-5003/5004 family.

author: MT
author_rank: Super Contributor
timestamp: January 14, 2016, 12:03:29 am
content: I had hoped 15 years of DMM progress would have improved the situation!Did a search:https://www.eevblog.com/forum/testgear/new-der-ee-lcrdmm/http://www.diyaudio.com/forums/equipment-tools/259415-der-ee-de-5000-true-lcr-100khz.htmlAre the 5000 still going strong?Are the 5003/4 better or worse in any parameters?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 14, 2016, 02:40:17 am
content: Quote from: MT on January 14, 2016, 12:03:29 amThe DE-5000 is the better LCR but it lacks a DMM. It has higher accuracy and 100kHz freq measurements and honestly is a great value still. The 5003/4 are lower accuracy and max at 10kHz setting but they also have the built in DMM. If you HAVE to have only one unit, then get the 5004 (if you can find it), otherwise get two separate devices.

author: Lightages
author_rank: Unknown
timestamp: January 14, 2016, 05:12:44 am
content: The Amprobe 37XR-A has an inductance measurement capability, but I have no idea of the accuracy or utility. I cannot vouch for its quality neither although Dave has one and likes it somewhat from his reviews.IMHO, it is better to get a decent multimeter and get a real LCR meter if you want proper measurements. The DER EE DE5000 is hard to beat. Get that and a BM257S, BM829S, or something similar and eat you cake and have it too.

author: MT
author_rank: Super Contributor
timestamp: January 14, 2016, 06:36:12 pm
content: Most likely it will turn out like that, one Derr dee 5000 and one BM257s a nice combo!Thanks for the info PedroDaGr8 and Lightages!
Oscilloscope probes and brands - Page 1
Forum section: electronics / testgear

author: sentry7
author_rank: Regular Contributor
timestamp: January 13, 2016, 10:09:30 pm
content: Hey guys,I'm looking into getting a Kikusui 100MHz analog oscilloscope, but it doesn't come with any probes. As I'm shopping for probes on ebay, I see some that are listed for "Tektronix and HP". Are probes brand specific? The connectors appear to be the regular "twist on" BNC connectors.

author: MrSlack
author_rank: Frequent Contributor
timestamp: January 13, 2016, 10:25:47 pm
content: +1 for this. I pay about £12/$20 a probe. I have some nice Tek ones but there is very little difference at least up to ~80MHz, my top whack.

author: jh15
author_rank: Frequent Contributor
timestamp: January 13, 2016, 10:44:48 pm
content: Huge difference in voltage rating vs frequency though, compared to OEM. Looking at my 600 volt rated $15.00 probes, 600 volts to 40khz, 250khz 100 volts, 100 Mhz and above, 25 volts.However they are my goto probes for most work. I keep my good probes in reserve.

author: tautech
author_rank: Super Contributor
timestamp: January 14, 2016, 01:46:49 am
content: Look for P6100 probes, 10:1 and 1:1 switchable 100 MHz rated and if you look hard you can find them for $12/pair.

author: vk6zgo
author_rank: Super Contributor
timestamp: January 14, 2016, 03:18:49 am
content: Quote from: sentry7 on January 13, 2016, 10:09:30 pmNo,it is just an advertising ploy,so they will pop up if you enter the terms "HP" & "Tektronix" into the eBay search window.The cheap probes can be used on all sorts of Oscilloscopes,keeping in mind the limitations referred to by the other posters.
HP6626A overshoots upon OUTPUT ENABLE, looking for firmware update - Page 1
Forum section: electronics / testgear

author: Le_Bassiste
author_rank: Frequent Contributor
timestamp: January 15, 2016, 12:12:28 pm
content: When trying to use my HP6626A for high-power LED testing, i noticed a considerable overshoot in output voltage before the CC kicks in.the owners manual says that there are two commands that can help to mitigate this, namely DCPON 2 and DCPON 3.my unit accepts DCPON 0 and DCPON 1, but seems to not accept 2 & 3. hence, i'm suspecting that a firmware upgrade to A.00.04 or later is required.from the manual:"Starting with firmware revision A.00.04 and later, two additional commands let you set the output current to a slightlynegative value when the OUPUT OFF command is issued, causing the outputs to be in constant current mode whenprogrammed “OFF”. The benefit of being in constant current mode when the output is off is that if the load impedance andthe voltage and current settings are such that the unit is forced into constant current mode at turn on, then the currentfeedback loop will be active during the transition to OUTPUT ON, and there will be no output current overshoot due tomode crossover."when issuing a ROM? command, i'm getting "3833" as response, but i have no clue as to what that firmware revision actually is.can somebody tell me where i can get the A.00.04 firmware?thx!with the 6626A set to 5V and 10 mA, i get the following on the output with a 100 Ohms resistor connected and pressing [OUTPUT ON]. (divide scales by 10)
Best place to buy fuses for DMMS - Page 1
Forum section: electronics / testgear

author: adnewhouse
author_rank: Contributor
timestamp: July 15, 2013, 01:19:41 am
content: A couple weeks ago I accidentally burned the last 500ma replacement fuse that came with my BK Precision 2709b multimeter. According to the manual: "Replace F1 only with the original type 0.5A/500V, fast acting ceramic fuse, 6.35x32mm." Where is the best place to buy genuine replacement fuses for a decent price? Anybody have any ideas?

author: adnewhouse
author_rank: Contributor
timestamp: July 15, 2013, 01:25:57 am
content: Never mind. I found some!http://www.mouser.com/ProductDetail/BK-Precision/194-045-9-001/?qs=ltjQbLPpdWi2jEdCDGJXqA%3d%3d

author: Anectine
author_rank: Newbie
timestamp: January 13, 2016, 06:35:51 pm
content: 194-045-9-001 is the wrong fuse for the 2709b. 194-045-9-001 has a length of 25mm (too short).The correct fuse for the 2709b is BK Precision part number 194-106-9-001:Mouser Part #: 615-19410691Manufacturer Part #: 194-106-9-001Manufacturer: B&K PrecisionDescription: Fuse Kits & Assortments 500mA 6x32mm FUSE DMM 390A pack of 4Best Regards,John
Tektronix 11000 series plugins in 7000 series mainframes - Page 1
Forum section: electronics / testgear

author: chris_leyson
author_rank: Super Contributor
timestamp: January 10, 2016, 01:03:06 pm
content: Given that you can allegedly use some 7000 series vertical plugins in the 11301 and 11302 analog scopes,http://w140.com/tekwiki/wiki/11301, I would assume that the connector pinout is identical for 7000 and 11000 vertical plugins. Could I use, say, an 11A32 or 11A34 in a 7854 mainframe ? Has anyone tried 7000 series vertical plugins in the 11301/2, do they really work ?I would like to use later generation hardware simply because it's a lot more reliable than older generation 7000 stuff.

author: c4757p
author_rank: Super Contributor
timestamp: January 10, 2016, 02:03:21 pm
content: I highly doubt it. Consider that the 11K series plugins don't have all the controls on them, they expect to receive their scale factor settings and whatnot from the mainframe. How would the 7854 know how to send those?

author: chris_leyson
author_rank: Super Contributor
timestamp: January 10, 2016, 02:40:17 pm
content: Good comment, the 7854 isn't wired up to do that. Maybe they used the pins for the readout interface or IEEE488 as on the 7B90P and 7A16P ? The digital section in the 11k plugin is probably not too difficult to hack, it's old school slow 5V logic and front panel controls could be added on, there seems to plenty of room. A pinout for the 11k vertical amplifiers would be nice but probably unobtainium.Also, I just noticed that the 11A32 and 11A34 seem to built on a single PCB with the analog front and back ends connected via coax and the digital section stuck in the middle.

author: edavid
author_rank: Super Contributor
timestamp: January 10, 2016, 09:07:51 pm
content: Quote from: chris_leyson on January 10, 2016, 01:03:06 pmWow, that is not my experience at all. I have found my 11K plugins to be even flakier than 7K plugins. I especially enjoy the ones that fail self test in an 11300/11400 mainframe, but work OK in a DSA600.

author: chris_leyson
author_rank: Super Contributor
timestamp: January 13, 2016, 01:02:32 pm
content: Thanks edavid. I think I will stick with 7000 series plugs in that case, at least I can get service manuals and schematics.
GaGe CompuScope 2125 oscilloscope card for IBM PC AT - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: January 09, 2016, 11:21:54 pm
content: Anybody out here who ever had a device like this?http://www.artisantg.com/info/gage_compuscope2125_datasheet.pdfCan it still be used for today's MCU applications or is it really obsolete?

author: wblock
author_rank: Regular Contributor
timestamp: January 09, 2016, 11:59:13 pm
content: The first problem is going to be finding a modern computer with ISA slots.

author: pascal_sweden
author_rank: Super Contributor
timestamp: January 10, 2016, 11:27:29 am
content: Never say neverhttp://www.adek.com/ATX-motherboards.html

author: Mark_O
author_rank: Frequent Contributor
timestamp: January 12, 2016, 04:05:47 pm
content: Quote from: pascal_sweden on January 10, 2016, 11:27:29 amNo one did.Thanks for pointing out though that there still exist industrial mobo's that have modern processor support, along with legacy devices, such as ISA, and a *hitload of RS232 channels.OTOH, beyond the rather anemic specs of this board as a DSO (compared to current-gen technology), i.e. a max BW of 125 MHz, max sample-rate of 125 MSa/s with two chans (twice if interleaved to to 1 channel); perhaps the greatest impediment to usability may be their extensive Driver support... for DOS, Win3.1, and even Win95! Sure that's 2 decades old, but hey! There are definitely some industrial-type shops around, still running PCs that ancient. I haven't seen one in at least 10 years, and most here couldn't care less, but... they DO exist.Then combine that with the fact that the max transfer BW from the sample RAM on the board into the PC isa whopping 2 MB/secTOTAL, for all channels, across however many boards you have installed, and you'd be better off with an external USB2 box, shovelling your samples into the PC. And unless someone is giving these boards away, the cost is probably going to be rather difficult to justify.Bottom line is that unless you have some very specific (and somewhat peculiar) requirements, a board like this makes no sense at all in the 21st century. And if you found one in a dumpster, it's not worth the trouble to take it out.

author: pascal_sweden
author_rank: Super Contributor
timestamp: January 12, 2016, 04:13:42 pm
content: Yes, I was expecting the same.Was also surprised about the modern MOBOs with ISA support.No specific application needs for this at this point in time, but I keep in mind in case I need ISA support one day
Korad KA3005P Control How to? - Page 1
Forum section: electronics / testgear

author: Meng
author_rank: Newbie
timestamp: June 20, 2014, 03:17:29 pm
content: I try to Create VB to control Korad KA3005PBelow is CodeMSComm1.Output = "*IDN?"What is wrong? Can someone help Urgently.

author: linux-works
author_rank: Super Contributor
timestamp: January 11, 2016, 04:57:56 pm
content: old post, but replying in case it helps someone.likely, you are sending newlines or CR chars to the psu and it does NOT like that!it seems to execute on the last valid char in the command and does not wait for a linefeed or CR. similarly, it does not send those chars in the reply, it sends strings that may (not 100% sure) have a term zero byte, but for sure it has NO newline or CR on the reply. really stupid, but its typical of china software, sad to say.
Limit on total number of calibrations for HP power supplies, is there one? - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: January 11, 2016, 03:14:48 pm
content: Most power supplies (and other equipment) count the number of calibrations and I know they are stored in some sort of non-volatile memory (EEPROM?). I am wondering if there is a hard limit on the number of calibrations that can be performed and stored, due to some sort of endurance limit in the EEPROM.Here are the EEPROMs in my Agilent 6626A, for example:IC 1K-bit EEPROM 250ns CMOS 8- DIPIC 4K-bit EEPROM 3.5US CMOS 8- DIP

author: Jwalling
author_rank: Unknown
timestamp: January 11, 2016, 03:53:57 pm
content: Quote from: SharpEars on January 11, 2016, 03:14:48 pmIt varies. Would be helpful to post the part #s of the chips.Looking in the service manual for the 6626A, one of them is a 1kb National NMC9346N.This one is good for 40K erase/write cycles. Doubt you'd ever wear that out...Jay

author: SharpEars
author_rank: Unknown
timestamp: January 11, 2016, 04:23:46 pm
content: Quote from: Jwalling on January 11, 2016, 03:53:57 pmYeah, if it's 40k e/w cycles, I'll be fine. I like to calibrate it in stages, with as many as 2-3 calibration data writes per ouptut (times 4 outputs on the power supply). So, by the time all is said and done, that might be like 8, 12 or even 16 writes for the entire calibration procedure (voltage, current, over-voltage, etc...). But, if 40k is the typical value, I'll be good for a long time.

author: macboy
author_rank: Super Contributor
timestamp: January 11, 2016, 04:35:32 pm
content: Quote from: SharpEars on January 11, 2016, 04:23:46 pmConsider too that it is 40k writes per memorycell(in this case per 16-bit word), not perdevice. So each individual calibration constant should be able to be updated 40k times.edit: correct cell size

author: SharpEars
author_rank: Unknown
timestamp: January 11, 2016, 04:43:12 pm
content: Quote from: macboy on January 11, 2016, 04:35:32 pmI am pretty sure that the PS does a block write of an entire data page of calibration constants, rather than delta writes of only the items that changed.
Building a tracking generator - Page 1
Forum section: electronics / testgear

author: AlphZeta
author_rank: Regular Contributor
timestamp: January 18, 2016, 03:16:13 pm
content: I built a tracking generator for my HP 8566B spectrum analyzer last week (details can be found here:http://www.kerrywong.com/2016/01/10/building-a-tracking-generator/), thought I'd share with everyone here.While the performance of this simple approach might not be as good as dedicated ones, it is very usable and does its job reasonably well up to at least 4 GHz. As long as your spectrum analyzer has an local oscillator output, you can use the same method to build a tracking generator for yours if you can't afford a dedicated tracking generator.

author: Fraser
author_rank: Super Contributor
timestamp: January 18, 2016, 03:59:13 pm
content: Excellent project.I want to do similar with my Advantest R4131 SA'sFraser

author: BFX
author_rank: Frequent Contributor
timestamp: January 18, 2016, 10:20:40 pm
content: Very good idea, sometimes I checked your web but it's nice to see you here

author: alterbaron
author_rank: Contributor
timestamp: January 19, 2016, 04:55:43 pm
content: Well done!One thing I noticed, is that the VSWR of that mixer's IF port can be as high as 4. Mightn't that affect measurements with this setup due to mismatch? Could be a good idea to follow the IF port with a pad.I also have an HP8566B, and have been thinking about doing this for awhile.Having only a 1GHz synthesized signal source, I'd probably have to build a synthesizer for 3.6214GHz, which is a little beyond my comfort range ATM. I still have a few simpler projects to royally mess up before I get to that level.I like the look of your suggested frequency mixerSYM-63LH+, but unfortunately for the home experimenter, mini-circuits only sells them in quantities of 10 or more. Is there a good place to buy small quantities of mini-circuits stuff?

author: AlphZeta
author_rank: Regular Contributor
timestamp: January 19, 2016, 06:06:33 pm
content: Thanks!Quote from: alterbaron on January 19, 2016, 04:55:43 pmI saw this as well. I did try adding a 3 db pad (HP 08565-60090) and a 6 db pad while experimenting but didn't notice any difference. But I think inserting an isolator between the LO and the mixer should help.Quote from: alterbaron on January 19, 2016, 04:55:43 pmDarn! I didn't even notice that they are only sold by an increment of 10! Don't know if they have any authorized partner or not....
Replacing a power supply tubeaxial fan with a non-tubeaxial fan - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: January 11, 2016, 04:28:11 pm
content: The tubeaxial fan on one of my Agilent 6626A is quite worn and rattles a bit, as well as not pushing enough air. If I replace it (i.e., UTG Fan-Tubeaxial 115-VAC 80-CFM 119X119X38-mm Al/Plastic, Protected Supply) with a more conventional non-tubeaxial ball-bearing fan, would that be a problem?What does a tubeaxial fan do that a non-tubeaxial (i.e., regular axial) fan does not?
Is Leader LPS-151 a clone of HP 6236B? - Page 1
Forum section: electronics / testgear

author: samofab
author_rank: Regular Contributor
timestamp: September 27, 2015, 01:36:50 pm
content: The schematic sure look almost exactly the same. I'm just wondering whether it's a blatant rip-off or did they license the design or some third option.Does anybody understand the reasons for some of the design choices the original designers made? I'm especially interested as to the placement of regulating transistor on the lower rail.

author: EvanShultz
author_rank: Newbie
timestamp: January 11, 2016, 01:18:53 am
content: Hi samofab,You mean Q203 and Q302 (and Q401, the complement for the negative regulator)? These are like a pass transistor, which are turned on the amount required to meet the requested output voltage and load current. In essence, they're variable resistors.If you have a circuit simulation package, you can see their operation quite clearly. It's a relatively simple circuit to build and simulate.

author: tautech
author_rank: Super Contributor
timestamp: January 11, 2016, 02:34:13 am
content: Quote from: samofab on September 27, 2015, 01:36:50 pmLinks please.

author: samofab
author_rank: Regular Contributor
timestamp: January 11, 2016, 07:10:02 am
content: Sure:http://exodus.poly.edu/~kurt/manuals/manuals/Other/LEADER%20LPS%20151,%20152%20Instruction.pdfhttp://reza.net/files/hp-6236B.pdf

author: anotherlin
author_rank: Frequent Contributor
timestamp: January 11, 2016, 08:22:57 am
content: Quote from: samofab on September 27, 2015, 01:36:50 pmI've just taken a look at both schematics, indeed they are pretty much the same.I would rather think they've licensed the design from HP. Or that they were the sub-contractor making the HP6236 and they somehow find an arrangement with HP. I don't think they would print the full same schematics in a service/user manual, unless they have something of a legit agreement behind.The design is pretty much classic/standard linear regulator. You may take a look at let's say a current HP E3610, it's basically same design.Now for using a PNP instead of an NPN as pass transistor, this is common in low drop regulator IC. From what I've read, this allow you to use only one transistor (hence low drop), instead of a PNP driving the NPN pass one.As for the design at hand, 2 transistors are used so that's not the reason.May be, it was easier to get hand at PNP power transistors instead of NPN ones.

author: MrSlack
author_rank: Frequent Contributor
timestamp: January 11, 2016, 08:32:45 am
content: I can't get to the PDFs for some reason as I'm on my phone. I own an HP6236B. Nice supply. Afer a second one when one makes an appearance on eBay.These are pretty standard design linear supplies but they have dual tracking so that might explain the arrangement.
TDS784d - NI GBIP-USB-HS communication problems - Page 1
Forum section: electronics / testgear

author: max-bit
author_rank: Frequent Contributor
timestamp: January 08, 2016, 06:39:36 am
content: TDS784d - NI GBIP-USB-HSProblemMy interface GPIB-USB--HS do not see an My oscilloscope?The interface is operating other equipment are shown and oscilloscope shows the configuration of the BUS OFF ?I do not know what's the problem?Maybe ? Advanced Settings - Bus settings ?Paraller Bus Durration: 0; uSec ?Bus timing: 2; 500 nSec ?
Can I upgrade hacked DS1054z from 04.03.SP1 to 04.03.02.03? - Page 1
Forum section: electronics / testgear

author: RenHoek
author_rank: Newbie
timestamp: January 08, 2016, 02:12:46 am
content: Hi,I have recently purchased a DS1054z and hacked it to DS1104z. Its current firmware is 04.03.SP1. I'm assuming that lines up to the release note (http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-0657/1/-/-/-/-/DS1000Z%20Firmware%20Release%20Notes.pdf) update for 0.4.03.00.01 (date: 2015-05-05).It appears there is a new firmware update for the DS1000z series and having copied the DS1000ZUpdate.GEL file onto a USB and popping into the DSO it detects the upgrade and asks if I'd like to upgrade to 04.03.02.03 (it says Model: DS1000Z, Version: 00.04.03.02.03). The Rigol release notes show this update's date as 2015-10-20. (Downloaded fromhttp://beyondmeasure.rigoltech.com/acton/fs/blocks/showLandingPage/a/1579/p/p-0019/t/page/fm/0).Would greatly appreciate if anyone can let me know whether this will be OK to upgrade or whether it may brick my DSO? Would I need to roll-back to a pre-hack default before I do this?As I bought this in Australia is there an alternative firmware or will that be the same worldwide?Thanks

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: January 08, 2016, 02:22:37 am
content: Yes you can upgrade without uninstalling the hack. There is only 1 firmware worldwide.

author: RenHoek
author_rank: Newbie
timestamp: January 08, 2016, 02:49:28 am
content: That worked. It now reports the version on the scope as 04.03.SP2Thank you!

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: January 08, 2016, 04:23:31 am
content: Glad it worked for you, enjoy.
Teardown: Solartron LM1619 1970s Digital Volt Meter - Page 1
Forum section: electronics / testgear

author: timb
author_rank: Super Contributor
timestamp: January 10, 2016, 11:13:05 pm
content: Wow, those PCBs are works of art.You know what would be awesome? A coffee table book full of beautiful, glossy shots of the insides of old school test gear. You know, showing the wiring looms, rows of components, hand drawn PCB tracks, etc..I should do a Kickstarter for that. About 5 years ago someone did a similar book, only he shot old mainframes and super computers. It was very successful.

author: crispy_tofu
author_rank: Super Contributor
timestamp: January 10, 2016, 11:16:35 pm
content: Wow, very nice!

author: AF6LJ
author_rank: Unknown
timestamp: January 10, 2016, 11:28:39 pm
content: Nice tear-down, good stuff.Thanks.
LeCroy WaveSurfer 24MXs-B Thread - Page 1
Forum section: electronics / testgear

author: robert_
author_rank: Regular Contributor
timestamp: December 03, 2015, 09:55:36 pm
content: Update: Now Lecroy Support+Repair experience thread.Hi,just recieved said scope. Looks just like described, perfect new condition, with protective foil still on the screen.Now the reason this Thread is (yet) so short: Its already packed up again.Turned it on, boots up into Win7 normally, Scope App launches and... strange noise, Black screen, refuses to turn on ever since. Well Crap.Now calling the german LeCroy support tomorrow to arrange RMA and get it repaired.Dont know what the hell failed, and why. Shipping damage maybe, but packaging and scope have no visible damage at all. No plans to look inside, Unit was made in mid-2015 and should really be covered by warranty.I guess i should have videoed turning it on, so id at least have a FAIL video now.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 04, 2015, 06:22:48 am
content: That's unfortunate, but as these scopes have 3yrs warranty there shouldn't be any issue to get it fixed. I guess they will collect it and send it to its Switzerland (Geneva) support center for repair. The turnaround time for normal repairs is 10 working days max if I remember right.Please keep up posted how things progress, and once you have the scope back, how you're getting on with it.

author: dom0
author_rank: Super Contributor
timestamp: December 04, 2015, 04:25:54 pm
content: I guess you're thelucky one?

author: joeqsmith
author_rank: Super Contributor
timestamp: December 05, 2015, 05:32:10 am
content: If it's brand new and you bought it from a dealer, why wouldn't it be covered?Hope it works out for you.

author: robert_
author_rank: Regular Contributor
timestamp: December 08, 2015, 04:39:15 pm
content: So, i called them on Friday and got called back and sent the shipping label on monday.Scope was collected by DHL express today, so its on the way to switzerland now.I hope whatever is faúlty is covered by warranty.

author: robert_
author_rank: Regular Contributor
timestamp: January 07, 2016, 07:18:56 pm
content: So, Update:Scope sent in on Dec09, repair finished Dec 28, scope recieved Jan 04. Power supply replaced on warranty.Now it does boot and indeed works fine for the first hour, then i got a blue screen with some distorted remaints of the UI, which clears up when lightly bumping the case but will reappear soon.Great, now its got a contact problem somewhere on the display. Would be easy to fix but that would cost me my warranty, which is something i wont risk on this device...Scope sent back again today...

author: nctnico
author_rank: Super Contributor
timestamp: January 07, 2016, 07:28:25 pm
content: Quote from: dom0 on December 04, 2015, 04:25:54 pmHow lucky is that? Perhaps the scope has been send back numerous times without getting fixed properly? There is a reason when a new scope gets dumped on Ebay. If it develops problems after the second time it has been 'repaired' I'd aim for getting a replacement.
Brymen 525 - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: January 06, 2016, 11:15:08 pm
content: Anyone know anything about the 525? New model? Anything anyone likes better in a similarly or better priced Brymen model? Maybe the 867S?Brymen site has specs on a 525:http://www.brymen.com/product-html/cata520/Bm520L2.htmTME calls it a 525S:http://www.tme.eu/en/details/bm525/portable-digital-multimeters/brymen/bm525s/

author: Lightages
author_rank: Unknown
timestamp: January 07, 2016, 12:32:34 am
content: The BM525S (S means updated model to meet current IEC requirements for CAT ratings) is in the same range as the BM829S. The biggest difference is that the BM525S has internal recording of up to 87000 readings and up to 20 times per second. IMHO, I actually think that the BM525s would serve most people much better than the BM869S. To make full use of the recording capability you need to buy the PC USB cable.
Aoyue Int 768 - I smoked the built-in power supply - Page 1
Forum section: electronics / testgear

author: whotopia
author_rank: Contributor
timestamp: January 05, 2015, 08:51:40 pm
content: I inadvertently burned out the power supply portion of my Aoyue soldering/hot air station. It happened due to the leads shorting for a long period of time on my work bench, but I didn't notice. Ooops! Symptoms are now no output voltage. No matter where the POT is set Voltage reads 21.2V and Amps reads 0.04A.I guess I will crack the thing open and start debugging. I've been in there before, and it looks like pretty simple, single layer through-hole boards.I was wondering if anyone else here has done this before and has any pointers, or you know of any schematics or service manuals available.Thanks.

author: Aodhan145
author_rank: Frequent Contributor
timestamp: March 05, 2015, 06:56:14 pm
content: Hi, I did the exact same thing mines reads around 21V as well. I cracked it open and saw that R43 was burnt to a crisp, I contacted the manufacturer to confirm the specs of the resistor it was a 360 ohm 0.6W resistor. So I got one out then realized I don't have another soldering iron so after a while of searching i found a shitty unregulated iron. I soldered it back together and It didn't work its still broke. I recommend checking if yours is blown and replacing it. Hopefully you have more luck than me.

author: whotopia
author_rank: Contributor
timestamp: January 07, 2016, 06:30:30 pm
content: Hi Aodhan145I finally got around to opening up and attempting repair on my Aoyue Int768 unit power supply circuitry.When I opened the unit, indeed R43 was fried. Suspecting there was more broken, based on your post, I bought a few more parts from Digi-key and replaced the LM723CN, C9012 Transistor , and the 1000uF 25V. That seemed to do the trick. The unit is working fine again. I included annotated picture below.If anyone else has this problem, make sure to photograph all the connectors before disassembly!Cheers.

author: Aodhan145
author_rank: Frequent Contributor
timestamp: January 07, 2016, 08:24:06 pm
content: I was able to return mine and they replaced the board for free I never bothered to fix it myself. I have a real bench psu so it didnt matter that much anyway but I only use the ouput from the soldering station to power the fan I use to blow the soldering fumes away.
Instek ds-1072a-u vs Rigol 1054z - Page 1
Forum section: electronics / testgear

author: andybarrett1
author_rank: Regular Contributor
timestamp: January 03, 2016, 09:04:50 am
content: HI AllHave been working for a whilst with a DS-1072 Not Mine !I now have some funding and am about to invest in similar for myself.Just some pointers / Ideas / Reasons why the Rigol over the Instek…. Cause that is what you all will advise !!!!BRAndy

author: andybarrett1
author_rank: Regular Contributor
timestamp: January 05, 2016, 02:24:20 pm
content: Hi AllI can only assume my question was too easy to answerRigol it is then...... Just interested to see if anybody had any comparisons to shareBRAndy

author: wraper
author_rank: Unknown
timestamp: January 05, 2016, 02:30:38 pm
content: This instek is old model and will completely suck compared to the modern models. You should look at GDS-1000B series instead.http://www.gwinstek.com/en-US/products/Oscilloscopes/Digital_Storage_Oscilloscopes/GDS-1000B

author: alsetalokin4017
author_rank: Super Contributor
timestamp: January 05, 2016, 02:51:30 pm
content: The Instek GDS1104B looks very nice but seems to be almost twice as expensive as the Rigol DS1054z. The Instek does have separate vertical controls for each channel though, which is something that many people seem to find necessary. (Doesn't bother me though.)I wonder how loud its fan is....

author: wraper
author_rank: Unknown
timestamp: January 05, 2016, 03:30:53 pm
content: Quote from: alsetalokin4017 on January 05, 2016, 02:51:30 pmIf you compare apples vs apples - e.g. 50 MHz model vs 50 MHz model, instek is a bit cheaper than rigol.

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 05, 2016, 04:45:30 pm
content: Hi,This is the price of GDS 1054B.http://www.tequipment.net/Instek/GDS-1054B/Digital-Oscilloscopes/

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 05, 2016, 04:51:46 pm
content: Also,I making the chat here including both model.https://www.eevblog.com/forum/testgear/digital-oscilloscope-comparison-chart/

author: nctnico
author_rank: Super Contributor
timestamp: January 05, 2016, 06:14:38 pm
content: Quote from: alsetalokin4017 on January 05, 2016, 02:51:30 pmI'd try to figure out what kind of bugs the GDS1000B has compared to Rigol. There is a whole list regarding to the DS1000Z series and Rigol isn't too quick with fixing them.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: January 05, 2016, 07:07:12 pm
content: Quote from: wraper on January 05, 2016, 03:30:53 pmIs there anyone in the world who has not "unlocked" their Rigol 1054z to 100 MHz bw, advanced trigger suite, larger memory and record function?
Meratronik C553 Digital clock teardown - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: October 01, 2014, 11:57:17 am
content: The clock was designed in 1972 and manufactured mainly for laboratories as a precision digital clock.It uses 6 ZM566M nixie tubes.Before:

author: doktor pyta
author_rank: Frequent Contributor
timestamp: October 01, 2014, 11:58:16 am
content: Inside:

author: doktor pyta
author_rank: Frequent Contributor
timestamp: October 01, 2014, 11:59:55 am
content: After:

author: doktor pyta
author_rank: Frequent Contributor
timestamp: October 01, 2014, 12:01:23 pm
content: And the schematic diagram (TTL ICs only):

author: BillWojo
author_rank: Regular Contributor
timestamp: October 01, 2014, 12:24:34 pm
content: Thats so cool. I love the look of nikie tubes. Very nice restoration. So where can I get one?BillWojo

author: poorchava
author_rank: Super Contributor
timestamp: October 01, 2014, 12:39:00 pm
content: My best bet would be Polish auction site Allegro.pl, but I don't know if you're gonna find anyone who's gonna ship such stuff to US at any reasonable rate.

author: doktor pyta
author_rank: Frequent Contributor
timestamp: October 01, 2014, 12:46:43 pm
content: Hi,They are quite rare. You can find this on Internet auctions once per say 2 years. This one has a serial number 640. Where are the rest ?One is used in control room of a nuclear reactor in Swierk, Poland (built in the 70s).http://www.rynekinfrastruktury.pl/public/galleries/reaktor-maria-w-swierku--zdjecia-cz-iv/bc2e027eeaa043a534c7f750782017fe.jpg

author: Vgkid
author_rank: Super Contributor
timestamp: October 01, 2014, 04:17:33 pm
content: That is very cool, I wish it was easier to find stuff like this.

author: LeszekLeszek
author_rank: Newbie
timestamp: January 05, 2016, 12:44:38 am
content: I have one for sale:http://allegro.pl/zegar-lampowy-meratronik-c553-vintage-unikat-bcm-i5900389619.html1974, fully functional and in good condition

author: crispy_tofu
author_rank: Super Contributor
timestamp: January 05, 2016, 12:47:14 am
content: Very nice!

author: AF6LJ
author_rank: Unknown
timestamp: January 05, 2016, 12:49:26 am
content: Thanks for sharing that, cool clock.
Rohde Schwarz Signal Generator SMK - Page 1
Forum section: electronics / testgear

author: downwind27
author_rank: Newbie
timestamp: January 04, 2016, 12:23:56 pm
content: I have inherited one of these, does anyone have any service information? It powers up but shuts itself down after a second or two.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: January 05, 2016, 06:01:44 am
content: Not sure if there are any manuals out there but you could contact R&S Germany and ask if they can send you the service manual for that device. R&S seems to be generally friendly and helpful towards hobbyists who use old R&S kit.
New Metrix DOX2000 (& DOX3000) scopes by Chauvin Arnoux - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: August 04, 2014, 08:10:15 pm
content: Yes, they are made by Siglent.So Siglent scopes are now sold under many different brans: BK Precision, Atten, LeCroy(!!!), Metrix...http://www.chauvin-arnoux.fr/produit/Famille_detail.asp?idFam=2196&idPole=1http://www.chauvin-arnoux.fr/display.asp?13386

author: Hydrawerk
author_rank: Super Contributor
timestamp: August 04, 2014, 08:21:51 pm
content: Siglent scopes are sold under many brands. (The Atten has a little bit different front panel layout but is still very similar.)

author: tautech
author_rank: Super Contributor
timestamp: August 04, 2014, 09:38:44 pm
content: When I politely inquired for a Siglent rebrand list, I was told "Top Secret".There are several more I have since discovered, some only marketed in specific parts of the world.I saw one on EEVblog from Eastern Europe whose name escapes me.

author: Hydrawerk
author_rank: Super Contributor
timestamp: August 05, 2014, 12:07:11 pm
content: Quote from: tautech on August 04, 2014, 09:38:44 pmTop Secret? LOL. Those Siglent scopes are so easy to recognise.

author: nctnico
author_rank: Super Contributor
timestamp: August 05, 2014, 04:07:19 pm
content: It's not that I ever would buy a Metrix scope but the designs of their equipment have some funky touch to them. Pity that they went with the standard Siglent box for this scope.

author: Hydrawerk
author_rank: Super Contributor
timestamp: August 05, 2014, 10:39:53 pm
content: https://www.eevblog.com/forum/testgear/the-most-weird-and-funny-dso-metrix-mtx3000/

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 03, 2016, 07:31:50 pm
content: New scopes sold as Metrix DOX3000 series were released.They are apparently rebranded Siglent SDS2000 series.(!NotXseries!)http://www.chauvin-arnoux.com/en/produit/dox-3104.html?liste=/en/produits/34http://www.chauvin-arnoux.com/en/produit/dox-3304.htmlI wonder if they are still full of SW bugs.http://www.ittsb.eu/forum/index.php?topic=1122.0

author: tautech
author_rank: Super Contributor
timestamp: January 03, 2016, 08:33:21 pm
content: From the images it seems Metrix are still using the V1 FW and the specs on the page listed ^^^ confirm this. Siglent V2 FW offers a 1mV/div range now plus further performance improvements, more memory, faster waveform update rates...... and many bugs have been remedied but not all.https://www.eevblog.com/forum/testgear/siglent-sds2000-new-v2-firmware/

author: pascal_sweden
author_rank: Super Contributor
timestamp: January 04, 2016, 01:08:16 am
content: These scopes from Metrix are ugly IMHO.The original Siglent version looks much nicer.What's the point of Metrix? To make it look ugly?
HP6200B Power Supply 2.4v diode GD8-001 Replacement - Page 1
Forum section: electronics / testgear

author: VictoriaGuy
author_rank: Contributor
timestamp: March 15, 2015, 05:30:11 am
content: Working on my HP 6200B power supply, I've read the discussions here at eevblog.There was mention of the GD8-001 diodes (CR8,9,31,and possibly 35) which are listed as 2.4v Si diodes in the Parts List.Wiser folks will know what these are; I didn't. They are not zeners, but stabistors (3 diodes in a package). For a quick substitute the suggestion here at eev was to solder together 3 diodes, and that would work.There are a few different manuals online for the 6200B, and one of them lists the replacement for the GD8-001 as the 1N4830 Stabistor.http://www.digitroncorp.com/Documents/Datasheets/1N4156,-1N4157,-1N4453,-1N4829,-1N4830,-1N5179,-MP.aspx?ext=.pdfIt looks like the Microsemi MPD300 would also work as a replacement.Luckily, those stabistors are OK in my power supplies, so I don't have to track down a source.Hopefully this note may help the next person find info on the GD8-001 diodes for the HP6200B.

author: sequoia
author_rank: Unknown
timestamp: January 03, 2016, 09:10:01 pm
content: It would seem "stabistors" are all but extinct nowadays?What would be best replacement (modern component) for these? Is there "better" low voltage zener diodes nowdays or diodes that achieve similar stability as these stabistors used to provide?Reading old specs for 1N4157 (or MPD300), which seem very close equivalents to the "HP" GD8-001, it would seem these were touted to be better/superior (in dynamic impedance) to low voltage zeners and provide higher tolerances than individual diodes (back in the day)....

author: SeanB
author_rank: Super Contributor
timestamp: January 03, 2016, 09:23:10 pm
content: TLV431, as you can get it to any voltage from 1V24 to 6V easily. TL431 if you are happy with 2V495 as a voltage. Low dynamic resistance and a lot better than any low voltage zener for the price, except at 6V2 where you can get a decent zener with reasonable specs. Just be aware of the pinouts for the different packages.http://www.ti.com/lit/ds/symlink/tlv431.pdfhttp://www.ti.com/lit/an/slva445/slva445.pdf

author: robert_
author_rank: Regular Contributor
timestamp: January 05, 2016, 04:42:14 pm
content: Just be careful the 431 can oscillate depending on its operating point and load impedance...Also, some 431 variants (esp. lower current versions) cant read their datasheet and still oscillate when they shouldnt according to the graph.
Philips Philoscop 2023 Restoration  - Page 1
Forum section: electronics / testgear

author: Martin.M
author_rank: Frequent Contributor
timestamp: January 02, 2016, 07:20:01 pm
content: Manufacturing: PhilipsModel: 2023 A or Bage: only 70 years, no Problemrecapping, cleaning, montage of that Philoscopgive him power, it wakes up, a nice and healthy magical eye tubethe instrument works ! I have to add some little C to the swapped capacitors to make it exactly in range, there is no calibrating screw..the working Philoscop, it`s donehow a Philoscope works:This is a test bridge for R and C with magical eye tube indicator.1.) connect the R or C you want to test to the instrument2.) Select the range where you think it will be found3.) The magical eye is closed, now turn the large knob up to the point the eye will be "open", then read at the scaling from the knob the solution.greetingsMartin

author: radhaz
author_rank: Regular Contributor
timestamp: January 03, 2016, 04:09:36 am
content: Very nice old device.

author: crispy_tofu
author_rank: Super Contributor
timestamp: January 03, 2016, 10:21:03 am
content: Very cool, the magic eye is very funky!
Rigol 4000 - Probe connector information - Page 1
Forum section: electronics / testgear

author: Trev4G
author_rank: Newbie
timestamp: January 03, 2016, 01:20:42 pm
content: I have recently purchased a Pintek PA622 current probe for my MSO4014. It needs power the battery is a nuisance as is an external supply. However the active probe connections on the 4000 series look like an alternative source of power. It would also be nice to fully ID the probe to the DSO but that is probably pushing my luck. I can already set the attenuation factor on Pin4.Checking the connector there are 7 pins ( numbering left to right):1) +5V2)3)4) ID signal (connected to standard single pin probe pickup)5)6) 0V (earth)7) -5VLooking at the manuals on the RP7150 & the T2R1000 the +/- 5V should be able to deliver 150mA and there is also a +/- 15V @ 150 mA ( unless the T2R1000 generates this internally which seems unlikely).So how do you turn on the +/- 15V presumably the T2R1000 does it. Anyone know how?I really don't want to generate the +9V @ 80 mA the current probe takes from +/-5V. Possible but I risk introducing noise.I have already made a socket to pick up the signals fron the 4000.I have also mapped the ID pin probe types against resistance. I will provide further details on this if there is any interest.Any info on this interface?Trevor
How about Fluke 3000 FC? - Page 1
Forum section: electronics / testgear

author: lichao
author_rank: Newbie
timestamp: January 02, 2016, 01:45:49 am
content: Seeking for a new multimeter to replace my radioshack one... Initially, I was mainly investigating lower end ones like 117. Later, I found the new 3000 FC seemingly fancier. I cannot find this unit in the comparison post. By manually comparing spec, I feel it has a similar performance as that of 179 (09/-2 AC, 10uA, 100k hz, 100uV). Is my conclusion correct?
How many satellite's are needed for a GPSDO to work correctly  - Page 1
Forum section: electronics / testgear

author: davebb
author_rank: Frequent Contributor
timestamp: January 01, 2016, 01:59:19 pm
content: How many satellite's are needed for a GPSDO to work correctlyThanks Dave 2E0DMB

author: Ian.M
author_rank: Super Contributor
timestamp: January 01, 2016, 02:32:17 pm
content: 3 satellites are required for a 2D GPS fix (which assumes zero altitude with respect to the WGS84 geoid). 4 satellites are required for a 3D fix. Without a known position, the receiver cannot correct for the effects of Doppler shift (due to the satellites' 14,000 km/hour orbital velocity) so cannot establish an accurate local timebase. All receivers will have a valid reference clock output and/or 1pps output when they have established a 3D fix, but the status of those outputs with a lower grade fix, or even a manually entered position and altitude would be dependent on the receiver firmware.

author: dom0
author_rank: Super Contributor
timestamp: January 01, 2016, 02:35:47 pm
content: Yes, that's what the survey-in feature is for. The GPS receiver in survey mode tries to very accurately determine the antenna position over a few hours (at least) or days and then locks that position in.I think this kind of GPS receiver can maintain an accurate clock after the survey with just one satellite, but I'm not certain. On the other hand I also question whether this is important - if the GPS weather is so poor with the current antenna setup that you can't get enough sats for a reliable 3D fix then clearly another antenna setup is needed for reliable GPS operation.

author: davebb
author_rank: Frequent Contributor
timestamp: January 01, 2016, 02:40:53 pm
content: Hi thanks for the infoThanks Dave

author: jpb
author_rank: Super Contributor
timestamp: January 01, 2016, 08:33:20 pm
content: Ublox timing GPS modules have a single satellite mode so long as the survey-in has happened. In fact, I think this mode is more consistent at least whilst it can still see the same satellite.e.g. see the highlights page for the Lea6T:https://www.u-blox.com/en/product/neolea-6t