hybridfree/eevblog-posts huggingface dataset:
Keysight E4406A question - Page 1
Forum section: electronics / testgear

author: rhb
author_rank: Super Contributor
timestamp: December 17, 2017, 01:39:51 am
content: How suitable for use as a general purpose spectrum analyzer are these? They're quite cheap on eBay.They look as if they'd be very good for general RF work, but I'm nervous that there's a gotcha I don't know about.

author: chriswebb
author_rank: Unknown
timestamp: December 17, 2017, 02:33:38 am
content: Found some stuff on keysight's forums. Didn't do much reading, but may be helpful:https://community.keysight.com/thread/1777

author: KE5FX
author_rank: Super Contributor
timestamp: December 17, 2017, 04:46:23 am
content: There's a reason they're so cheap. There are alotof drawbacks to the E4406A when used as a general-purpose spectrum analyzer. Limited span width, no front-end RF filtering, lots of controls and features are disabled, and deliberately-crippled usability for the ones that are provided -- e.g., the knob tunes at the same rate regardless of span.But they're still very nice instruments. If your application involves characterizing a known signal source (as opposed to hunting spurious signals, doing EMC precompliance, or otherwise looking at sources with unknown characteristics), they're very capable. They're especially well-suited for use in automated test applications.

author: rhb
author_rank: Super Contributor
timestamp: December 17, 2017, 02:45:29 pm
content: Thanks. I felt sure there was a reason they were so cheap. It looks as it it would make a hell of an SDR with the I/Q output option. Rather larger than my SDRplay RSP2 though. I'll have to search around to see if they can be hacked into something more capable.
LCD Oscilloscope with Good Colour Screenshot Export Facility? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: December 16, 2017, 07:56:23 pm
content: Hi!Having seen many, many of the high-quality Colour Oscilloscope Screenshot Exports posted on here dealing with PSU and TE faults, etc., can anyone suggest an inexpensive model with colour screenshot export (available used or "parts/repair") I can look for please?I'm looking for something not more than 100MHz BW, 2 channels will be adequate, (I wouldn't say no to 4 if I can find one whose price isn't stratospheric!) - (I realise the chance of getting the proverbial "simple psu fault" one cheap is virtually nil as everyone wants such!!), can anyone give me ideas of brands, models and an approx. idea of the maximum I ought to pay for a faulty one?Use is for fault-finding low-frequency (< 100 MHz) basic Test Equipment, and basic digital circuits, no more than 15-20MHz clock.I have to admit the Tektronix TDS210 etc., I had to use in Unipart's fleapit put me off LCD oscilloscopes a bit and I've not kept up to date on 'em! Even my current employer only provides standard CRT-Based Hameg Analogue ones!Chris Williams

author: Fungus
author_rank: Super Contributor
timestamp: December 17, 2017, 09:18:18 am
content: Rigol DS1054Z.

author: nctnico
author_rank: Super Contributor
timestamp: December 17, 2017, 10:57:09 am
content: If you only need to look at wiggly lines then anything will do (even the scopes from Owon or Hantek). I'd buy a new one though because the older models from A-brands with a TFT screen tend to have disk-drives instead of USB and be more expensive. If you want to document behaviour of devices then it might be worth to look at MicSig TO1000 series. These can record a video from what is on screen. For some cases this can be way more self explaining than a series of static slides.
Hp8711b bootload and firmware need - Page 1
Forum section: electronics / testgear

author: ovenqin
author_rank: Contributor
timestamp: December 15, 2017, 01:53:45 pm
content: Hi all, Thanks all for help me in posthttps://www.eevblog.com/forum/testgear/hp8711/now I check CLIP for Hp8711a and Hp8711b. The different of two type of machine is SHARED DRAM size. Hp8711b's SHARED DRAM Extent to 1M*4(TC514400) instead of the chips(TC514256).I check my A2 unit and find TC514400 chips solder in PCB. So I think I have to refresh my 28F010 bootload and Firmware to HP8711b. now I program the 28F010 and firmware Sam and picburner gave me it still is HP8711a,the CRT screen display the SHARE DRAM Size is 1MB . But acutally the SHARED DRAM of my machine is 4MB.I find Mrf245 post of his HP8711Bhttps://www.eevblog.com/forum/repair/hp8711b-vna-power-up-failed/Maybe someone could upload the bootload for 28F010 and firmware of HP8711B to help my challenge work.Thank you for help.73! BD7TQ

author: ovenqin
author_rank: Contributor
timestamp: December 16, 2017, 06:45:10 am
content: Firmware 8711B, 8712B, 8713B, 8714B Network Analyzer Firmware Upgrade, B.03.54 (1.2 MB) ,I find in Keysight websit,Now someone could upload 8711B bootload for 28F010.
High-resolution 100MSa/sec DSO's (or digitizers) ? - Page 1
Forum section: electronics / testgear

author: precaud
author_rank: Frequent Contributor
timestamp: December 15, 2017, 03:32:30 pm
content: I have a Lecroy 9430 10-bit 100MSa/sec DSO that has been very useful in its frequency range, but I would like some more bit depth; 12- to 16-bits @ 100MSa/sec. Any ideas on what is (or has been) available ? I would prefer used gear, as this is not a config that gets used every day.

author: Pitrsek
author_rank: Regular Contributor
timestamp: December 15, 2017, 04:28:04 pm
content: Analog discovery 2 - 2x 1M?, ±25V, differential, 14-bit, 100MS/s, 30MHz+Red Pitaya - 2x 1M?, 125 Msps, 14 bits, 50MHzPicoscope 5000 - up-to 16bits. really nice, really pricey.Analog discovery is nice piece of kit, if you can live with the bandwidth. No personal experience with Red Pitaya. Friend of mine has an older version of 12bit Picoscope and loves it.

author: MrW0lf
author_rank: Frequent Contributor
timestamp: December 15, 2017, 07:56:28 pm
content: Depending on the task AD2 memory size might be a limitation eg it will start severely losing sampling rate at large timebases:https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manualQuote
Newbie question about DSO with LAN connection - Page 1
Forum section: electronics / testgear

author: Old Printer
author_rank: Frequent Contributor
timestamp: December 14, 2017, 05:14:29 am
content: Does the LAN connection on lower end DSOs provide a realtime view similar to a USB DSO? Or is it more of a slow screen capture, or not even that. I have an Analog Discovery 2 USB scope ect., and I quite like the large screen viewing. Could I get the display of say a 1054Z, which I think has LAN, on my computer display in realtime? Thanks.

author: Mr. Scram
author_rank: Super Contributor
timestamp: December 14, 2017, 03:10:55 pm
content: Quote from: Old Printer on December 14, 2017, 05:14:29 amIt depends on the DSO. Some are pretty good, others can be woefully slow.

author: JPortici
author_rank: Super Contributor
timestamp: December 14, 2017, 03:19:51 pm
content: realtime? hell no. expect anything between less than one to a few updates per second, depending on buffer size, timebase etc.
Thoughts on GW Instek GPD-3303S? - Page 1
Forum section: electronics / testgear

author: whyme?
author_rank: Newbie
timestamp: June 15, 2017, 10:38:50 pm
content: Hello,I'm in the process of building a small electronics lab and am shopping for a bench PSU. I've come across the GPD-3303S, a gentleman is selling it for $300 CAD (roughly $225 USD). Is the price reasonable ? It looks like a good bench psu and Instek makes solid products.What I will be using it for: mostly for educational purposes, basic circuit analysis, building rectifiers ccts, mosfet ccts analysis, Arduino stuff and may be some design projects in the future.I was checking out the popular but modest KORAD KA3005P as a potential buy but perhaps an used psu with more channels could end up being very useful. I can acquire the Korad for ~$250CAD.There's also the BK1671A-ND for around ~$225 USD but meh.What do you guys think ? I'm open to suggestions! Thank you kindly :]

author: BMCha
author_rank: Newbie
timestamp: June 15, 2017, 11:21:26 pm
content: I've recently been psu-shopping as well and that was one of the models I considered. Be aware that the newer 3303s units (if there's no gap between the binding posts for the 3 channels on the new ones) seem to have some overshoot problems and possibly poor transient handling on the 2.5/3.3/5v third channel.As far as I can tell the main 2 channels are fine though, and if you do get an older "gapped" version all 3 channels are good.

author: nctnico
author_rank: Super Contributor
timestamp: June 15, 2017, 11:43:02 pm
content: For that price I'd spend a little bit more and buy the newer GW Instek GPE-X323 brand new with warranty! At least this model has individual channel controls.

author: SkyMaster
author_rank: Frequent Contributor
timestamp: June 16, 2017, 02:43:47 am
content: The thread about the possible problem that BMCha is making reference to can be found here:https://www.eevblog.com/forum/testgear/instek-gpd-3303s-power-supply-overshoot-opinion-wanted/25/Also,http://canada.newark.com/sells the GPD-3303S for $700 (plus sale taxes)... so a nice used one at $300 is probably a good deal.

author: whyme?
author_rank: Newbie
timestamp: June 16, 2017, 04:26:52 pm
content: yay, got it for $270 :]I'll do some tests to see if it has this overshoot+transient issue

author: SkyMaster
author_rank: Frequent Contributor
timestamp: June 17, 2017, 03:55:50 am
content: Quote from: whyme? on June 16, 2017, 04:26:52 pmCongratulations

author: michaelf
author_rank: Newbie
timestamp: August 10, 2017, 03:16:44 am
content: Quote from: whyme? on June 16, 2017, 04:26:52 pmAny word on the overshoot? I'm looking at this power supply as well but leery about the overshoot.

author: Reymil
author_rank: Newbie
timestamp: December 15, 2017, 07:36:10 am
content: Hi, does anyone of you encounters a problem with GPD-3303S that is limited to 4.5DCV in both channel 1 & channel 2?
tl866 6.60 bug with ds1250 - Page 1
Forum section: electronics / testgear

author: fisafisa
author_rank: Regular Contributor
timestamp: December 13, 2017, 10:25:22 am
content: HiI was having trouble trying to program a ds1250y with the tl866.It seemed that the ram was only 125kB as the content replicated 4 times.Is it the chip or the device?So I put together a circuit with a raspberry pi to read/write the ds1250yNow I am convinced that the issue is with the tl866.Is there a way to report bugs?Anybody with version 6.13 at hand? That was the first version where they introduced the chip support.One hopes they would have tested it then and then later some bugs have been added.In any case my ds1250Y writer from rpi is much faster<1s to read vs 7s of the tl866I did not bother with 3.3 to 5V conversion, just some 680ohm resistors in between the D linesrpi2 has 26 usable gpio, non sufficient to drive A0-A18 0-D7 and WE OE, so I added a HC4040 to generate 12 bit of address by counting..mmap the GPIO registers in userland and some fun with code.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 14, 2017, 06:17:44 pm
content: v 6.13http://www.ej9.ru/data/minipro/minipro-v613-setup.rar
Hantek 6074BC - Page 1
Forum section: electronics / testgear

author: temeraire
author_rank: Newbie
timestamp: January 14, 2017, 06:03:43 pm
content: HI everyone,I need some help with this oscilloscope which seems to have corrupted eeprom attached to Cypress microcontroller. Is there anyone who has or could do memory dump of this eeprom(24LC64)?

author: newtom
author_rank: Newbie
timestamp: April 21, 2017, 10:33:41 pm
content: Hi,I've just ordered one 6074BC myself. If you tell me how to do the dump, I'd help.NewtoM

author: newtom
author_rank: Newbie
timestamp: May 02, 2017, 11:01:04 am
content: Hi again,the 6074BC is now here and with the RestoreIIC.exe tool I can connect to the Cypress chip. If you tell me how, I could get the memory dump.NewtoM

author: martinloren2
author_rank: Newbie
timestamp: December 14, 2017, 01:57:43 am
content: Newtom can you run the lsusb -v command and show the result once connected the scope to the PC, without having run the software?And another time after running the software?
R&S CRTU - Searching for info on Windows 2000 application development - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: February 05, 2017, 09:27:30 am
content: Hi,As I am getting familiar with the CRTU, I started wondering how you develop custom applications for the automated measurements on the Windows 2000 partition.I imagine that it works either with some R&S framework preinstalled on the Visual Studio that comes with the unit (did not test, yet) or one accesses the functionality using the NI software...Any help is much appreciated:- documentation- sample source code- existing applicationsThanks,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: December 13, 2017, 04:05:43 pm
content: *** UP ***Hi,I have a CRTU, but the Windows 2000 partition is basically empty. It has the NI tools, Visual Studio and I managed to install the R&S drivers.I have a folder with the TrayIcon.exe but it just times out.Otherwise, I have no Windows 2000 software at all for this device...Could anyone provide me with:- the applications that should be there- a complete backup of the HDD or at least the Windows 2000 partition- any information of these applicationsI know that the DOS mode is what people want to use this device with, for the spectrum analyzer and signal generator, but I would like to understand what kind of automated measurements this device was designed for.Thanks!Vitor
New firmware for Keysight 3446xA/34470A version 2.17 - Page 1
Forum section: electronics / testgear

author: TheSteve
author_rank: Unknown
timestamp: December 09, 2017, 03:50:08 am
content: Looks like Keysight recently released new firmware for the 34460A/34461A/34465A/34470A series of bench DMM's.Firmware here:https://www.keysight.com/main/software.jspx?ckey=2367633&lc&ccRelease notes here:https://www.keysight.com/upload/cmc_upload/All/Firmware_2_17_Release_Notes.pdf34460A/34461A/34465A/34470A Revision 2.17 Enhancements and Fixes1. Firmware modifications to support and recognize the new measurement board within the instrument.2. Resolved a defect that caused the DMM to down-range with a 1000V range specified in theCONFigure:VOLTage:AC command together with SENSe:VOLTage:AC:RANGe:AUTO ON, thus producingtwo readings.3. Resolved a defect where the DMM would incorrectly accept negative values forCALCulate:SCALe:DBM:REFerence.4. Resolved a defect where CONFigure:VOLTage:DC and CONFigure:VOLTage:DC:RATio would not set theimpedance (Input Z) to ‘Auto’.Doesn't seem like anything too major but it is interesting to read about a new measurement board - perhaps they have made a change with respect to the whole maximum voltage issue?

author: Faith
author_rank: Unknown
timestamp: December 09, 2017, 11:29:08 am
content: Quote from: TheSteve on December 09, 2017, 03:50:08 amFrom earlier this year:Quote from: Keysight Technologies Rep on April 01, 2017, 04:55:30 pmEmphasis mine. It's now December... so I guess that's related?

author: HighVoltage
author_rank: Super Contributor
timestamp: December 09, 2017, 11:54:22 am
content: Thanks for pointing the new FW out, I had not seen this.Also interesting for Keysight to point to the new hardware.Hmm, may be they made some changes after all.

author: AndyC_772
author_rank: Super Contributor
timestamp: December 09, 2017, 12:01:25 pm
content: Hard to see why new firmware would be needed just because of a voltage rating somewhere in the front-end. Usually a firmware update would imply some change that can't be backward compatible, ie. some new circuit that needs to be driven differently to an old one.

author: Dr. Frank
author_rank: Super Contributor
timestamp: December 20, 2017, 02:39:46 pm
content: I've updated my 34465A, and now a new licensing option shows up, when you press HELP => ABOUT.There's now: AVG - Enable AC average measurements.I can't find that license on the support site, nor any description, what's behind.Does anybody have a clue?Frank

author: HighVoltage
author_rank: Super Contributor
timestamp: December 20, 2017, 05:17:23 pm
content: I updated one of my 34465A and 34470A and both showed up with the new AVG option.Also, there is no info in the release notes.Hmm, may be time to send an email to Keysight.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 20, 2017, 07:35:00 pm
content: I just updated two of my 34461AThe installation went smooth and both show up with the new AVG option (Not installed)
Sick Agilent U1252B - Page 1
Forum section: electronics / testgear

author: wizard1
author_rank: Contributor
timestamp: December 12, 2017, 09:00:13 pm
content: Back in July I acquired a new old stock Agilent U1252B from Nmori87. Everything looked good with my limited initial testing, but I've since discovered that it shows incorrect values in the DC 50V range when used with a shunt type RF probe. Initially I thought it was the probe, but I have confirmed with 3 other meters (U1252A, Fluke 87 V, and cheap Radio Shack portable) that the probe is working correctly. I have various supplies around the homelab and everything I've thrown at the faulty U1252B does show the value I would expect (again confirmed with 3 other meters) so I believe it's more than just an adjustment to calibration constants.I've reached out to Keysight for help but of course the meter despite being new is out of warranty. I assume repair is going to be more than the meter is worth, are these repairable at home? I haven't yet been able to locate a schematic. Does anyone have experience with repairs on this meter?
[Tektronix TG2000] Looking for video patterns files - Page 1
Forum section: electronics / testgear

author: Flanbix
author_rank: Contributor
timestamp: December 07, 2017, 05:05:42 pm
content: Hi,A colleague of mine got a Tektronix TG2000 from eBay. Unfortunately the battery was dead and after replacement we realised that the video patterns were gone.We managed to get some of the PAL pattern from the Tektronix website but not the NTSC ones.We asked Tektronix but no luck so far.Maybe someone on the forum have some of these *.drl files on a floppy disk.I don't know if it is relevant but we use it in analog output (AVG1).

author: jblgf
author_rank: Newbie
timestamp: December 12, 2017, 08:36:45 pm
content: I'm looking for it too
Rigol Waveform Playbck "dim" - Page 1
Forum section: electronics / testgear

author: g0mgx
author_rank: Regular Contributor
timestamp: December 11, 2017, 09:28:43 am
content: Hi GuysI have a DS2102A 'scope and I am having issues with waveform recording and playback. When I playback a recorded waveform, I am finding the brightness of the playback waveform very dim indeed.I've created a (very poor) video to show the problem.https://youtu.be/dSMypOHJ4BMCan anyone help identify what I am doing wrong?If there are expert Rigol users here I'd also like to know if its possible to turn on persistence of the Math trace and also set the 'scope in DC mode but with a DC offset?ThanksMarkG0MGX

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: December 12, 2017, 02:23:26 am
content: I can duplicate the behavior you show in the video by turning on persistence before starting to record the waveforms. Considering what persistence is (making the waveform darker in spots it hits many times) and what playback mode is doing (showing a single waveform capture at a time), this seems to make sense. If I'm correct, try turning off persistence before you record the waveforms, and see if the behavior persists. When you think about it, persistence and playback don't really make sense together anyways.

author: g0mgx
author_rank: Regular Contributor
timestamp: December 12, 2017, 02:26:59 pm
content: Strangely, I can't reproduce this myself now. I **was** using the persistence function (and disappointed it didn't apply to the math trace) but it was certainly switched off when i was seeing the issue.I guess a found a combination of events that cause this behavior.MarkG0MGX
RESERVED (Germany - Berlin - Pick up) HP54503A 500MHz Sampling Oscilloscope. - Page 1
Forum section: electronics / testgear

author: KaZjjW
author_rank: Newbie
timestamp: December 11, 2017, 09:58:10 pm
content: Hi everyone !I'm moving soon and I have an oldHP 54503 A I would like to be "taken care of".The calibration fails on all channels due to bad contacts in the front end relays, but the range 5V-500mV seems to work OK. I bodged a new calibration RAM battery few months ago and the power supply was replaced by a PC power supply ten years ago or so..The scope comes with three HP 10430 A probes, with the original accessories. Also the Service/User/Programming manuals.I'm giving the WHOLE lot for free. Pick up in Berlin (Neukölln) ONLY before the 18th December. First come, first served.PM me for details and to arrange a pick up day and time.Cheers,Jean.
HP/Agilent 8644A/B difference - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: December 09, 2017, 05:32:39 pm
content: Hello. I'm a first timer here. So, HELLO!I went crazy on eBay and purchased 3 RF generators. Two HP8644A with Oven controlled Xtal oscillator and One Agilent 8644B with no options.Other than name plate and the fact B has low phase noise option (mode 3) standard, one is optioned to 2GHz and others just 1GHz, what are the differences? They look identical and seems to work identical to me. Also, where IS the NiCad batteries? From forum searches, there are Nicads somewhere and holds self-calibration data. I'm pretty sure they are dead by now, so I'd like to replace them. I opened the top side and looked around and I found none. I'm pretty sure bottom is just a backplane?Thank you very much.

author: OH7MHL
author_rank: Newbie
timestamp: December 09, 2017, 07:37:39 pm
content: Hi,Nice pile of generators, congrats!NiCad battery is located in DCU unit (slot A16).I replaced that with bigger NiMh type.In 8644b version there is a electrtonic attenuator (PIN-diodes) and A-version include traditional resistive attenuator network with relays.Here you can download all availabe 8644x documents:https://www.keysight.com/en/pd-1000002189%3Aepsg%3Apro-pn-8644B/high-performance-signal-generator-1-ghz-or-2-ghz?cc=FI&lc=fin&lsrch=true&searchT=8644BI have to say that 8644b is very good RF generator for my purposes.

author: tkamiya
author_rank: Super Contributor
timestamp: December 09, 2017, 10:29:44 pm
content: Thanks for that.A pile is right. Very heavy pile indeed.... I've located the battery. I, too, would like to use something other than Nicd but NiMH uses different charging scheme. Have you had any issues? Otherwise, there is plenty of space in that area, so I'll just use cordless phone batteries.

author: OH7MHL
author_rank: Newbie
timestamp: December 10, 2017, 10:18:40 am
content: Yes that charging cheme difference was one concerrn but so far I did not found any problem with that.

author: tkamiya
author_rank: Super Contributor
timestamp: December 11, 2017, 02:36:06 am
content: I've decided to go with NiMH. I got 3.6v 80mAH version. I'm thinking with such small amount of charging and draining, I shouldn't encounter issues. I'll do one at a time just to make sure.Thanks.

author: beanflying
author_rank: Super Contributor
timestamp: December 11, 2017, 03:02:56 am
content: Just watch out for the NiMh self discharge issues, I am dealing with a dead rom for someone currently after she didn't use her controller for a while. Nicads are better on that account and LiPo's better again.

author: OH7MHL
author_rank: Newbie
timestamp: December 11, 2017, 10:46:30 am
content: NiMh self discharge issues can be avoid by using Low Discharge Cells but I think that availability is zero in that size. But there is plenty of room for own build 3 x 1.2V NiMh LSD stack.I would not use LiPo in that device without proper charger.When I bought my 8644B that battery was totallly dead. Only drawback was long self calibration routine in every time when switched on.
HP Agilent 8562E signal identifier - Page 1
Forum section: electronics / testgear

author: jfphp
author_rank: Regular Contributor
timestamp: December 11, 2017, 01:11:01 pm
content: Hello,I would like to use an 11970W external mixer on my 8562E : impossible to find the signal identifier in the various menus. Looking at the user manual gave a funny answer : present if software revision <920528 or option 008. Absurd : present in the oldest software revisions or marketing idea (pay an extra option) ? If I fit this old revision (I have 97XXXX) I will probably lost the cal data and a new cal is impossible as the TAM is not compatible with 8562E, except installing another option !!!. An idea to solve a crazy problem ? Thank you

author: kirill_ka
author_rank: Frequent Contributor
timestamp: December 11, 2017, 04:00:26 pm
content: I think I've read that it's a hardware option.

author: kirill_ka
author_rank: Frequent Contributor
timestamp: December 11, 2017, 09:47:20 pm
content: Firmware update notehttp://file.yizimg.com/355402/2013040215054884.pdfstates that:"If the serial prefix is 3305A or below, answer 'Y' (yes) and enter Option 008; these analyzers have the signal identification feature as standard."
CIC Research High Voltage differential Probes - has anyone heard of them? - Page 1
Forum section: electronics / testgear

author: raviteza88
author_rank: Newbie
timestamp: December 10, 2017, 08:13:13 pm
content: Hi all,Has any one heard of this company called CIC Research which makes specialized high voltage differential probes (like upto 30kV)? I am intrigued by their high CMRR of -110 dB even at 10 MHz. And their probes seem to somehow have a specialized circuit which improves CMRR at high frequencies according their own product description.I would like to know if any one has any idea how their probes are designed or pictures of their probes (of course the internal circuitry)http://www.cic-research.com/http://www.cic-research.com/datasheets/DP04_Datasheet_06-B.pdfis one of their 8kV, 120 MHz probes.Thanksp.s: I am also closely following the other Lecroy HVFO probe thread too.
Precision Standards Corporation DC voltage calibrator - Page 1
Forum section: electronics / testgear

author: daniel62
author_rank: Newbie
timestamp: December 10, 2017, 03:31:31 pm
content: Hi everyone, I'm a hobbyist and I enjoy buying ebay test equipment. The last purchase is a DC voltage calibrator that unfortunately got damaged with several broken components inside due to the unfixed power transformer. The brand is Precision Standards Corporation and the model 430A, on the internet I could not find anything, is there any of you who kindly knows this brand and has the scheme to understand what components are missing and the value of those broken? Thanks.
Christmas multimeter stress tester - Page 1
Forum section: electronics / testgear

author: joeqsmith
author_rank: Super Contributor
timestamp: December 09, 2017, 02:24:09 am
content: This devices has been being advertised on the radio all this week. How long until someone hooks it to their meter and tries to measure the output voltage.https://lightkeeperpro.com/instructional-videos/https://www.google.com/patents/US6480001

author: xrunner
author_rank: Super Contributor
timestamp: December 09, 2017, 02:40:25 am
content: QuoteYea, normally it would be a good idea to know what you are doing, but not now.

author: SeanB
author_rank: Super Contributor
timestamp: December 09, 2017, 03:51:41 pm
content: I think you have some knowledge of what will happen on many meters Joe.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 10, 2017, 03:13:55 pm
content: Quote from: SeanB on December 09, 2017, 03:51:41 pmAt least several UNI-Ts anyway.
unresponsive GenRad digibridge troubleshooting - Page 1
Forum section: electronics / testgear

author: dave the sound guy
author_rank: Contributor
timestamp: September 07, 2016, 04:22:23 pm
content: Hello folks, yesterday I pulled a GenRad 1658 LCR digibridge from the dumpster at work and brought it home...not because I needed it as I already have an ESI LCR meter but the GenRad has quite a few more features and would be able to test at different frequencies which might be useful in certain scenarios. As I suspected, the unit did not work when I tested it at home. When powered on all of the keypad and display indicator LEDs light up and stay on and the numerical readout is blank/off. The controls are unresponsive except for an "Ext. Bias In" switch that turns an LED in the front display on or off, but a look at the schematics show the LED is in-circuit with the switch. I haven't opened it up to look for clues but there is a sticker next to the Ext Bias switch that points to it and says "Do not touch or death will occur." I'll need to find out what that switch is supposed to do...From these signs, is it likely that the PROM or microprocessor are damaged?

author: Vgkid
author_rank: Super Contributor
timestamp: September 07, 2016, 07:38:01 pm
content: http://bama.edebris.com/manuals/gr/1658/Here is the manual, in 4 parts. My 1658 works, but my 1689 is friedGood luck, check the power rails first.

author: cnqhdszq
author_rank: Regular Contributor
timestamp: December 10, 2017, 07:25:40 am
content: yesterday ,I bought a GenRad 1692 LCR fromwww.38hot.netforum .very cheap .of course bad ,it has the same apearance when I powered it up .first I checked the fixture with a oscilloscope but I cound see nothing on the screen. So I checked the CPU clock ,nothing found .so I check the 38.400MHz crystal oscillator (with metal covered, only 4 pin ) found it is bad ........maybe helpful for you .

author: 2N3055
author_rank: Super Contributor
timestamp: December 10, 2017, 11:32:05 am
content: Power buses (+5V digital, +5V anaalog, -8V analog). There is a clock generation circuit that generates several synchronous clocks for circuitry..Like cnqhdszq said, start from crystal (38.4 MHz) down the path, to microprocessor. Also there might be DS1230 battery backed RAM that might hold calibration constants for the device..If that is gone, who knows how would it behave.. Anyways, if you manage to revive it, and DS1230 is still alive, you might want to save it's content ASAP...Good luck!
Siglent Spectrum Analyzer SSA3021X tracking generator failure - Page 1
Forum section: electronics / testgear

author: Chipguy
author_rank: Unknown
timestamp: December 10, 2017, 12:48:11 pm
content: Hi !A friend of mine found a software bug on his Siglent SSA3012X spectrum analyzer.After certain user interactions like playing around with offset etc. the tracking generator kinda fails and almost switches off.Here is a video he took. It happens at 0:40. Unfortunately he doesn't like to talk on the video, he's shyhttps://youtu.be/v0Vdr9meg30Siglent already has acknowledged the failure and plans to fix it ASAP.Just wanted to share this one.
Tek TDS7404 triggering issue - Page 1
Forum section: electronics / testgear

author: geshka
author_rank: Regular Contributor
timestamp: December 09, 2017, 08:18:14 pm
content: Hello there.I've been offered TDS7404 for fair price with one issue that I am observing with this scope - triggering is funky. To be exact - I am able to synchronize with test signal only on "rant" mode. External signals are difficult to synchronize and sometimes impossible at all. Is there definitive test for synchronization/triggering ? Would it be hard to fix if problem exist? what scope with in that condition would be worth ?Thanks.

author: nctnico
author_rank: Super Contributor
timestamp: December 09, 2017, 08:49:04 pm
content: I'd apply a signal (from the probe calibrator output) set the scope back to default and use the auto setup. If that fails to get a stable trigger with a regular then it is safe to assume the oscilloscope has a serious problem. If you don't have a donor oscilloscope with a known good acquisition board I wouldn't spend a lot of money on it because an oscilloscope which can't trigger is basically worthless.

author: geshka
author_rank: Regular Contributor
timestamp: December 09, 2017, 09:28:32 pm
content: Thanks for quick response, Nctnico.This is exactly an issue... test signal (compensation meander in autoset) is jerky but not to the point when it is running away all the time - it is sometimes jumping left or right and it is surely not rock solid like on my old trusty analog scope. I am really confused and undecided. and is that repairable if this is a problem?

author: KE5FX
author_rank: Super Contributor
timestamp: December 10, 2017, 02:44:42 am
content: One tricky aspect of fast DSOs is that if the trigger circuit is running at full bandwidth, it may see ringing and ground bounce on a low-frequency square wave that the acquisition system is hiding from you at slow sweep speeds.I'm not familiar with the TDS7404, but see if there's a lowpass filter option for the trigger (may be called 'HF REJECT' or something similar.) In general, try switching to a much faster timebase than you would ordinarily use, and see if you see a lot of ringing/undershoot appear. If there's an envelope or peak-detect acquisition mode, this may also give you a clue as to what the trigger circuit is actually doing.
Rigol DL3021A - Page 1
Forum section: electronics / testgear

author: SteveRosenlund
author_rank: Regular Contributor
timestamp: December 07, 2017, 07:54:30 pm
content: Hey y’all I have a Rigol DL3021A. I know it has its issues. But it works for my needs. I’m kinda dumb when it comes to things like this but I was wondering something. Dave’s tear down of the DL3021 showed empty FET slots on the board that are most likely reserved for the 3031. Would there be any way to add those FETs in and expand the machine’s capabilities? Or would I also need new software that’ll allow the higher loads?Any way to upgrade this thing?

author: SteveRosenlund
author_rank: Regular Contributor
timestamp: December 09, 2017, 04:03:49 am
content: Buehler...Buehler...It seems like I’m way off my mark here.

author: bitseeker
author_rank: Super Contributor
timestamp: December 09, 2017, 05:20:39 am
content: It's conceivable that you might be able to upgrade it to have more capability. After studying the design and determining what hardware components are needed, you'd also have to have firmware that supports the additional hardware. Beware that there may be other hardware or data modifications (e.g., inside EEPROM) needed to change the identification of which model it is.I don't have one of these loads, so I don't know to what extent Rigol may have made it easy or difficult to upgrade the instrument yourself. But, hopefully this gives you some starting points for your exploration.

author: Pinkus
author_rank: Frequent Contributor
timestamp: December 09, 2017, 11:24:42 am
content: Given that (by today) it was not possible to upgrade a Rigol DP832 power supply to a DP832a (*), I assume that telling a DL3021a to become a DL3032a will be equally difficult, as this is not just activating software option.* Remark: while it is possible to activate misc. additional options such as enhanced resolution, changing the unit behaviour (UI / color display) from a DP832 > DP832a was never possible by anyone.

author: TurboTom
author_rank: Super Contributor
timestamp: December 09, 2017, 01:38:08 pm
content: I'll second that... And considering the overall performance of the load, I doubt it will find too many users who could possibly contribute to establish a hack. If Rigol revises the hardware to improve especially low-current performance, things may change of course.Or let me put it that way: The mediocre hardware is Rigol's hack protection of the DL3000 since they will sell so few that just noone will attempt a hack...But seriosly, the hardware can be easily upgraded to match the DL3031(A) by adding the six MOSFETS and a little "chickenfood". I doubt there's much more difference between the version except some switches in the firmware/configuration - figuring out these will be the hard job.Cheers,Tom

author: SteveRosenlund
author_rank: Regular Contributor
timestamp: December 09, 2017, 09:37:41 pm
content: Thanks for the responses. I think I’ll leave it be in hopes rigol improves it to where it’s more widely adopted and experimented with.
Hack Rigol 2000x - Page 1
Forum section: electronics / testgear

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: December 07, 2017, 02:05:19 pm
content: Hello guys, I was thinking to get a better scope than my 1054z, and I noticed that the 2072A doesn't cost that much.. but the bandwith of only 70Mhz isn't enough (Obv)So I read about the hack on the 2000x series, I know that already exist many many posts, but my english isn't that good and I haven't undestand if the hack on the 2072A is possible only via Keygen (as the 1054z) to upgrade it to 56M, Decoders, 300Mhz and the other things, or I have to make it via hardware or to modifing some code or other things that include some knowledges in programming(I am very sorry for this topic already open..)

author: Ghislain
author_rank: Regular Contributor
timestamp: December 07, 2017, 05:37:39 pm
content: This has been described in detail in this forum I believe however you can also take a look at the procedure described herehttps://hackaday.io/project/8115-rigol-ds2072a-upgrade-to-ds2302aThere is no need to change hardware, everything is done in software. It seems safe to perform since the software basically only extracts key data from the usb connected scope which is then used to generate serial keys to unlock the options.Mind you, the article is not recent so there is no guarantee this still works with the latest versions of the firmware.PS. I do not own a Rigol scope, proceed on your own risk

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: December 08, 2017, 08:45:37 pm
content: Thank you very much
Fluke Networks FI-7000 ST, SC, FC, LC, MPO Fiber Optic Tester any opinions? - Page 1
Forum section: electronics / testgear

author: GuidoGoHawks!
author_rank: Newbie
timestamp: December 12, 2017, 04:01:54 pm
content: Hello I'm new to the forum, and yes I tried searching for this topic from the menu bar, not the search bar on the right. My company is looking at buying one of these testers for about $3k. My question is simply, Is it a good tester? Is it a good price? How well does it function? Just looking for a basic review from someone who has used one. And whether or not they liked it or might have another suggestion. Thanks!!
HP 3478A owners UNITE: (Not exactly a storm, but the sky is pink) - Page 1
Forum section: electronics / testgear

author: Sailor
author_rank: Regular Contributor
timestamp: June 11, 2015, 01:14:31 am
content: A blatant plagiarism of Kjelt's title, and it worked for himIn the 3468A thread I relied to a question about the 3478, pointing out that the 8039 program ROM was available e.g. from k04bb, but that there was also a mask-programmed 8048 micro in there as well, and that I didn't think there was any way of reading that code.Well, I'm pleased to say that I WAS WRONGIt seems that the 8048 responds to the same sequence that is used during the verify phase of programming the 8748, so we can get the code. Then in the case of an 8048 failure, it could be replaced by an 8748 (if you can get one) or an 8039 (11MHz rated) with a piggy-backed EPROM.I don't have a HP3478A to read this code from, BUT SOMEONE SHOULD DO IT.Just saying....

author: MarkL
author_rank: Unknown
timestamp: June 11, 2015, 05:33:20 pm
content: I have a 3478A and a programmer that knows how to read a 8048/8748, but again it's a similar situation to the 3468A ROM in that it's soldered in and not socketed. And to make it more fun it's also a 40-pin DIP.I'll put it on my I'll-get-to-it list, unless anyone has an urgent need for it right now.Being a mask ROM, I would think it's a lot less susceptible to bit rot. Have there been any reports of this part (U462) going bad?Thanks for the heads up; I hadn't really noticed this other controller.

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: December 08, 2017, 05:13:23 am
content: MarkL, did you ever get around to read it and store it somewhere? I've had to replace one of those and need to program it, I'm getting ad link failure right now.

author: MarkL
author_rank: Unknown
timestamp: December 08, 2017, 04:15:22 pm
content: Quote from: Ordinaryman1971 on December 08, 2017, 05:13:23 amI'm sorry, but I did not get around to this yet.Unfortunately, I don't think I'm going to be able to do it in the foreseeable future. The processor might need to be removed from the circuit to read it, so it's potentially a bit of a project.
easyScopex and Siglent SDS 1202X-E - Page 1
Forum section: electronics / testgear

author: charliec
author_rank: Newbie
timestamp: December 07, 2017, 09:30:08 pm
content: Just got my 1202x couple days ago and having fun making friends with this little device. It came with a CD that contained easyStepx and thought I would check that out. installed the net framework and installed the program, set I/O to USBTMC, but in the software, it does not seem to see the scope. I am sure the cable is plugged into min Win 10 machine because the doorbell chimes when I turn the scope on. When I select Add Device, USBTMC, and refresh, nothing happens. Is there something else I need to do to recognize the scope in this software?I did a search before posting this question, but didn't see anything relevant to this issue.

author: tautech
author_rank: Super Contributor
timestamp: December 07, 2017, 11:38:07 pm
content: Welcome to the forum.You need also have NIVISA installed before connecting to the DSO.Mention of this is in the EasyScope install instructions.What you may have now is your OS has installed a generic USB driver so you need reassign to the one NIVISA provides.Attached is a (probably now out of date) guide but it should help to point you in the right direction.

author: charliec
author_rank: Newbie
timestamp: December 07, 2017, 11:51:12 pm
content: Thanks a lot. Up and running now!!Charlie
ICS Protection uninstall ?? - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: December 08, 2017, 09:16:11 pm
content: Just got a Lecroy scope (WaveSurfer MXs-B), and when plugging in a USB flash drive, I got a popup, saying the drive was 'rejected'...After having looked a bit, it appears it has a 'Norman Shark iCS' protection software (that company was later bought by Blue Coat and later thus Symantec...), which prevents using any USB drive that has not been scanned (and 'validated', putting some special file on it) by a central scanning server...That software is specifically designed for test equipment and industrial PCs.Now... where's the issue...I should just uninstall that stuff and go on, noWell, that's the where it starts to get complicated... there's no such software installed according to the system, and obviously no uninstaller...Googling a bit further confirms... : the software has been thought to be un-uninstallable...even by administrators...And from Symantec, I got the answer that the way the get the uninstaller software (because there's one...) is to buy a license of the product... they must be kidding !!!!!!!!I must be honest: they offered an alternative: format the drive and reinstall the OS !!!Having developed (Windows) drivers in another life, I don't believe it can't be uninstalled... but I don't have too much time to put into this... I guess they implemented a filter driver for the USB storage class, I'll try to verify that... If it goes further, it's a rootkit, not a security software !!!Anyway... if anyone has any experience and/or any usable information about how to get rid of this piece of shit (sorry, a software that can't be uninstalled without paying is a piece of shit !!), please share...
Infiniium 5.50.0027 installation package wanted - Page 1
Forum section: electronics / testgear

author: radarx
author_rank: Newbie
timestamp: December 07, 2017, 09:49:16 am
content: Hi,Im looking for an instalation package of Infiniium software ver 5.50.0027 for 9000 series scope, anyone can help ?Best,Radek
BM235 newest firmware revision? and can we buy pre-programmed MCUs as upgrade? - Page 1
Forum section: electronics / testgear

author: markb82
author_rank: Regular Contributor
timestamp: December 07, 2017, 01:41:49 am
content: Hi,I have one of the first batch of BM235 with a few bugs (rev C). I reworked R67 to improve the LCD contrast, but now I'd like to rework the MCU to one with the newest firmware loaded.Any chance Dave could provide these on the store?I'm also waiting on the 121GW (first batch woot!), so would be nice to combine shipping or maybe provided it as a little extra for people that have both meters and want to update the BM235.Thanks,Mark

author: EEVblog
author_rank: Unknown
timestamp: December 07, 2017, 02:13:49 am
content: Quote from: markb82 on December 07, 2017, 01:41:49 amGiven the number people who would want it, honestly I don't think it's worth the effort, even if they would sell them to me.
DS2072 event table "details" tab, how to open? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: December 08, 2017, 12:49:56 am
content: The tab in the screen shot, how do you open it?It doesn't seem to be mentioned in the user guide.Firmware is 00.03.05.SP3

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: December 08, 2017, 03:02:34 am
content: Pretty sure its only available when you are decoding specific busses. Can't remember for sure, but think it was only if decoding CAN. Try changing decode type to CAN, then open the event table, and press the View button to change to the Details tab.Edit: Actually, I know I've used it for I2C decoding before too. Checking the user guide also confirms its available for CAN (Fig. 8-14) & I2C (Fig. 8-7) decoding.
Problem with Uni-T UT501A - Page 1
Forum section: electronics / testgear

author: Oaklander
author_rank: Regular Contributor
timestamp: December 06, 2017, 12:24:36 pm
content: I have Uni-T UT501A insulation resistance meter. It has worked well until recently but not anymore.I tried measuring insulation resistance of an induction motor, but the meter does not generate test voltage. The test voltage reading stays zero and no sound can be heard. Normally a buzzing sound is heard when the measurement is ongoing.Has anyone encountered this problem? Is there anything I can do?

author: _Wim_
author_rank: Super Contributor
timestamp: December 06, 2017, 08:41:57 pm
content: I would say open it up and check if something is wrong. If your lucky the damage is clearly visible... If not, start checking all components.