hybridfree/eevblog-posts huggingface dataset:
HP34401 low input impedance and maximum voltage question - Page 1
Forum section: electronics / testgear

author: harrimansat
author_rank: Regular Contributor
timestamp: December 26, 2019, 08:03:33 pm
content: I´m fixing a HP34401, someone with the same multimeter can please check if impedance above 20 volts is 100k?Attached photo is voltage input at 10V scale 10 Mohms selected, connected at Tektronix 576 curve tracer.With more of 20V impedance is 100k?Manual says 1000v max voltage but nothing about impedance.ThanksRegards

author: Kleinstein
author_rank: Super Contributor
timestamp: December 26, 2019, 08:25:58 pm
content: The input specs are some 100 K beyond some +-17 V for the 0.1 to 10 V ranges. This also makes sense looking at the schematics.The opening in the center is likely due to the input capacitance.

author: rolkinas
author_rank: Contributor
timestamp: January 11, 2020, 12:14:31 am
content: on mine 34401A:1Vdc to 1000Vdc impedance stays 10 Mohm (input R selected to be 10 Mohm )1V - 0.1uA10V - 1 uA100V - 10uA1000V - 100uA(measured with Keithley 237)Switcing input R to 10 Gohmit stays high impedance 0-12Vdcabove 12Vdc input R switches to 10 Mohm

author: harrimansat
author_rank: Regular Contributor
timestamp: January 13, 2020, 04:45:57 pm
content: Quote from: rolkinas on January 11, 2020, 12:14:31 amThanks, but in 1V and 10V scale, with voltaje greater than 17V wich is the impedance?

author: rolkinas
author_rank: Contributor
timestamp: January 13, 2020, 05:20:46 pm
content: when 10M input impedance in meniu is set, actual impedance at 30Vdc through mV, 1V, 10V ranges appears to be 300kohm100V and 1000V are steady 10Mohm. Of course 34401A displays OV.LD in lover ranges with 30V on inputTransition from 10Mohm to 300k is at 20Vdc

author: harrimansat
author_rank: Regular Contributor
timestamp: January 17, 2020, 05:43:20 pm
content: Scale swtiching time and impedance at VDCHI
HP 1331A X-Y monitor - service manual? - Page 1
Forum section: electronics / testgear

author: qu1j0t3
author_rank: Regular Contributor
timestamp: July 19, 2018, 03:43:49 pm
content: Once again I have succumbed to the ebay siren and purchased this small storage X-Y.The service manuals appear to be hard to find, however - unlike all my Tek gear and other HP scopes, for which I've been able to find manuals.Has anyone ever seen this manual?Thanks in advance.

author: qu1j0t3
author_rank: Regular Contributor
timestamp: January 17, 2020, 04:29:13 am
content: It is available here:http://hparchive.com/Manuals/HP-1331A-Manual.pdfBut is very low resolution.

author: qu1j0t3
author_rank: Regular Contributor
timestamp: January 17, 2020, 04:41:08 am
content: It turns out the device is faulty. Note squealing from very near the capacitors and suspicious flash. CRT does light up but dot blooms completely, maybe high voltages (and low voltages) are out. Will replace caps.https://imgur.com/a/G2TnZep
How to measure DVB-T OFDM - Page 1
Forum section: electronics / testgear

author: jkprg
author_rank: Contributor
timestamp: January 16, 2020, 04:41:02 pm
content: Hi,I have a DVB-T modulator PCIe card and I'm feeding it with valid (most of the time) MPEG TS stream but TV can't decode the output. What equipment would you suggest for DVB-T modulator measurement to check if it's generating correct signal and if not how to find what's wrong with it? I'm not sure if I really need OFDM analysis instrument because those kind of tools (like FSQ or FSV etc.) are usually really expensive ($10+K). Is it the only way? Maybe PSK analysis across all subcarriers would be enough (although thousands of subcarriers will be certainly painful). Maybe USB some spectrum analyzer (or SDR) with software analysis will be enough but I haven't seen any so far.Thanks for any suggestion.Best RegardsJaroslav

author: RoGeorge
author_rank: Super Contributor
timestamp: January 16, 2020, 04:57:29 pm
content: I've seen open source projects of DVB-T modulators/demodulators built with nothing but an ADALM-PLUTO. It's an educational SDR from Analog Devices, open source, of about $100-$200 (IDK the current price) new.Search for "adalm pluto DVB-T".Since it's all open source, it can be made to measure whatever you need, in theory. Not sure if that will help or not, in practice.

author: tmbinc
author_rank: Frequent Contributor
timestamp: January 16, 2020, 05:37:03 pm
content: I'd first make sure that the problem is on the RF/Baseband side, not in the MPEG2 stream. For that I'd probably use a random Linux box with DVB (PC with USB dongle, Dreambox, whatever), and manually tune to the channel (via tzap -https://www.linuxtv.org/wiki/index.php/Zap). If that doesn't work, I'd use a random spectrum analyzer with sufficient sweep/FFT bandwidth to cover the channel bandwidth (i.e. slightly more than what an RTL-SDR can do, though you could sweep there as well) without fancy decoding, and just see if the rough spectrum shape looks like a DVB-T channel. If that's the case (and you still can't lock to it), I'd triple-check the modulation parameters. Only if that still doesn't yield anything I'd dive into the baseband domain. You can do this with gnuradio (https://github.com/gnuradio/gnuradio/tree/master/gr-dtvis a working DVB-T receiver that you could hack to give you the intermediate data to verify).If locking works, but the TV "doesn't show the channel", I'd use dvbsnoop (http://dvbsnoop.sourceforge.net/) to verify the PAT, PMT, SDT, and maybe record the PES-PIDs and check if it successfully plays back on a PC using VLC, maybe use a commercial MPEG2-TS checker (some of them are really good, and some have demo versions).

author: jkprg
author_rank: Contributor
timestamp: January 17, 2020, 11:09:53 am
content: Thank you very much. It seems SDR will be the way to go. I'll have a look at that direction.BTW does any of those (even expensive HW) OFDM analyzers check orthogonality of subcarriers? Does it make any sense to check the feature when OFDM modulators are digital?
Chauvin Arnoux – Trying to get a manual for a Metrix OX8627? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: January 16, 2020, 09:32:02 pm
content: Hi!I sold on eBay about 3 years ago a Metrix OX 8627 (analogue/digital CRT based) oscilloscope with a number of faults because Chauvin Arnoux (the lot that took over Metrix) refused to supply me with a service manual and quoted me over 400 € plus shipping costs (both ways!!!!) to send it somewhere in France to look at it!I found a post from somebody who claimed to have schematics for this on another forum but when I contacted him he just ignored me – I knew he must have got documents of some sort from somewhere as he quoted circuit reference nos. in his post, and those oscilloscopes are totally devoid of silkscreen on any of the PCBs anywhere!Have C.A. always had this policy of refusing technical help and support or was it a policy change of theirs fairly recently?(If I could have afforded this I'd have paid then kicked up a nasty stink with C.A. afterwards stating the repairs hadn't been done to my satisfaction and insisted on a refund or a copy of the S.M. – in short – paid under duress and then make their life a misery afterwards!)Chris WilliamsPS!I never got to hear anything back from the buyer, by the way, so I've no idea whether the faults on that oscilloscope got fixed or not!

author: shakalnokturn
author_rank: Super Contributor
timestamp: January 16, 2020, 10:26:59 pm
content: I know of someone on here who has successfully been in touch with C.A. in the past few years and obtained DMM schematics that he was kind enough to share here.I asked them for help once over, they redirected me tohttps://www.manumesure.com/for the technical aspects. I don't think I took it any further.To me C.A. are going down the drain, you even have to login to their website to download free software now, other T.E. manufacturers do that too, I can't see the point.When you do find schematics from the Metrix era never take them for granted, they aren't always that clear and I've spotted a couple of inconsistencies on the previously mentioned DMM schematics.For the OX 8627 if still of interest, it should have at least some PCB's in common with other models from the OX800 family if schematics for those are around the www.There are some schematics to be found here for a OX 8627 scope that apparently had PSU and CH1 problems:https://www.circuitsonline.net/forum/view/147711https://www.circuitsonline.net/forum/view/121153
New Siglent SDS2000XPlus launched - Page 1
Forum section: electronics / testgear

author: rf-loop
author_rank: Super Contributor
timestamp: January 16, 2020, 02:42:27 am
content: Siglent have launched 16.1.2020 new oscilloscope serie, SDS2000X Plus.Note, independent of its model name it not any kind of "face lift" model from old SDS2000X series. It is totally new generation. It stay just below SDS5000XOf course it have 10,1" capasitive touch screen supporting multi touch gestures and it support also keyboard and mouse and of course internal web server for control.Later bit more.....I will later edit this topic 1st msg

author: tautech
author_rank: Super Contributor
timestamp: January 16, 2020, 02:47:34 am
content: Yes, now official.Website links and pricing:https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/

author: rf-loop
author_rank: Super Contributor
timestamp: January 16, 2020, 02:52:29 am
content: Quote from: tautech on January 16, 2020, 02:47:34 amOfficial EU - NA public launch date is today 16.1. (AFAIK)Here in China it is launched time ago.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: January 16, 2020, 07:27:20 am
content: I was the 4th person to see the YouTube video, love the big display, looks decent.

author: rf-loop
author_rank: Super Contributor
timestamp: January 16, 2020, 09:06:35 am
content: Quote from: tautech on January 16, 2020, 02:47:34 amI have been extremely busy here in China so I just today and yesterday forget this older thread what you have made time ago. And I did not find it with my quick look around. So, is it perhaps better continue there?https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/

author: tautech
author_rank: Super Contributor
timestamp: January 16, 2020, 09:08:44 am
content: Quote from: rf-loop on January 16, 2020, 09:06:35 amShall we ask the moderators to merge threads ?

author: Martin72
author_rank: Super Contributor
timestamp: January 16, 2020, 09:48:40 pm
content: Or let them close it and post it again in the "older" thread ?

author: supperman
author_rank: Regular Contributor
timestamp: January 16, 2020, 10:02:18 pm
content: Ahhh... I don't know where to post.So who is going to research if the hardware is the same and 100Mhz = 500Mhz. That would be a Rigol killer... for sure..

author: tv84
author_rank: Super Contributor
timestamp: January 16, 2020, 10:20:18 pm
content: Quote from: supperman on January 16, 2020, 10:02:18 pmPost in the older.Supposedly the HW is the same for 100-350. 500 requires a special 350. Future will tell the rest.

author: rf-loop
author_rank: Super Contributor
timestamp: January 17, 2020, 07:43:10 am
content: Quote from: tautech on January 16, 2020, 09:08:44 amYes please if here is anything useful, otherway is: this thread can abandon and leave to sleep.Continue inhttps://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/.

author: tautech
author_rank: Super Contributor
timestamp: January 17, 2020, 07:52:12 am
content: Quote from: rf-loop on January 17, 2020, 07:43:10 amDone.....then we can have a tidy of unnecessary posts.
Leader LDM-170 Distortion Meter - Page 1
Forum section: electronics / testgear

author: Gonzini
author_rank: Contributor
timestamp: April 26, 2013, 11:07:52 pm
content: Hi guysPicked up an older Leader LDM-170 Distortion Meter that's basically working but looking for the schematics / service data. Only found the user manual on the web.Any chance someone might have anything on these units?Cheers

author: Steve71
author_rank: Newbie
timestamp: January 17, 2020, 03:11:32 am
content: I have all relevant service info including schematics if anyone needs them. Email me at stevethehifitech@gmail.com and I will send you a copy.
Sencore PA-81 manuals - Page 1
Forum section: electronics / testgear

author: Bargainhunter
author_rank: Regular Contributor
timestamp: August 22, 2017, 10:40:40 pm
content: Need manuals (owner & service) for Sencore PA-81.Thank you,Chuck

author: jh15
author_rank: Frequent Contributor
timestamp: August 28, 2017, 03:16:19 am
content: Someone here has them. I have only the owner's manual. Lost the service manual. Sure it is in a storage moving box.Be willing to pay to have high quality scan of the color pcb layouts and stuff.In meantime I am familiar with it, having bought it in 1990.Do you have the 5 kw load?

author: SES Audio
author_rank: Newbie
timestamp: January 12, 2020, 02:58:25 pm
content: Adding the schematics to this thread for future use if anyone needs them.

author: jh15
author_rank: Frequent Contributor
timestamp: January 17, 2020, 02:07:15 am
content: I always wanted to copy the custom proms (eproms?) to files or spare chips in case they fade or die.Are you familiar with a programmer and chip numbers for this unit? I have some programmers, etc, but was hoping you might have done that.Of all my audio related gear, this is something I want to keep. It came out after I built a rack doing the same stuff, but not digital. (1978).I got my idea from custom test gear built at Yamaha. I had attended a 3 day Yamaha factory service training course.The instructor said theirs was designed by an in-house tech.I switched to a PA-81 as soon as I saw it. (along with Sound Technology distortion analyzer and FM stereo generator).
IGBT Tester - Page 1
Forum section: electronics / testgear

author: marc.hickling
author_rank: Contributor
timestamp: January 16, 2020, 12:19:10 pm
content: Hi all, i'm looking to find a good IGBT tester that will test IGBTs (generally power modules from VFD Drives) that will do high current and high voltage testing. I need to ensure that the IGBTs I buy from china will work when in the drive under load... I know I can make a low current high voltage test and then do high current low voltage which would satisfy (to a point) but I wondered if there are any commercial units out there that anyone's used?any thoughts?

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: January 16, 2020, 12:23:04 pm
content: My best advice is not to buy semiconductors from China.Buy from reputable dealers and save the hassle of having to test each batch.I got some irfp240/9240's from China.First pcb lasted 10 minutes before they failed.So bought some from RS Components and they are still working months on.
Resetting Error Log on TDS620A Oscilloscope. - Page 1
Forum section: electronics / testgear

author: mwbarth36
author_rank: Regular Contributor
timestamp: January 14, 2020, 09:51:45 pm
content: Does anyone know how, or if, the Error Log can be reset after a repair has been made to the TDS620A? I have repaired an acquisition board and it now works fine, would like to get rid of the past Errors in the Log. Have the Service Manual, but that is no help!

author: Galen
author_rank: Regular Contributor
timestamp: January 16, 2020, 01:55:25 am
content: you can try, use GPIB to send command 'err clear'. It works on TDS C and D serials.

author: keystone
author_rank: Contributor
timestamp: January 16, 2020, 08:17:11 am
content: I just tried that on my 620A and it didn't work. I got a time out error.
Brüel & Kjaer Exciter Control 1047 teardown - Page 1
Forum section: electronics / testgear

author: WackyGerman
author_rank: Regular Contributor
timestamp: December 23, 2016, 09:31:17 am
content: Here are some teardown photos of my Exciter Control 1047 which I get from a good friend as a christmas gift

author: WackyGerman
author_rank: Regular Contributor
timestamp: December 23, 2016, 09:40:17 am
content: Unfortunately I don t have any documents for this unit . Sweeping works fine but there seem to be many other functions I don t know . Some parts are from 1974 , a nice vintage kit in a good optical condition

author: Vgkid
author_rank: Super Contributor
timestamp: December 23, 2016, 06:35:14 pm
content: What is it used for?

author: R005T3r
author_rank: Frequent Contributor
timestamp: December 23, 2016, 07:30:02 pm
content: Here is explained:https://en.wikipedia.org/wiki/Exciter_(effect)

author: slab
author_rank: Newbie
timestamp: January 19, 2020, 05:06:04 pm
content: I was wondering if you ever found a documentation for the Brüel & Kjaer - Type 1047.I have one myself and having issue understanding most of the functions.Till today I could only get the main Output to work (sinewave ok, freq ok, upper/lower limit ok).But not the Fixed Osc. or the Variable Osc. output. Nor the Input actually.
calibrate Metrix MX52  - Page 1
Forum section: electronics / testgear

author: TomPet54
author_rank: Newbie
timestamp: July 28, 2018, 12:42:30 pm
content: Hi,I'm a proud owner of a Metrix MX52 multimeter but when I checked it against a Agilent 6,5 digit meter the voltage range was slightly off.My questioon is: Does anybody know which potentiometer is used inside to correct the meter? I dare not touch anyone in fear of ruining it alltogether.Hoping for help,// TomPet54

author: coromonadalix
author_rank: Super Contributor
timestamp: July 28, 2018, 01:00:25 pm
content: Ask Chauvin Arnoux Aka Metrix they sent me calibration software in the past and where very helpful, sometimes the email end in their spam folder, took me a while to receive an answer.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 21, 2019, 12:28:20 am
content: Just stumbled across the topic looking for other things, so I am aware the answer may be a little late.MX 50,51,52 do not use software calibration.If ACV only is off, it's worth checking the electrolytics around the canned AD636 first, then you have trimpots for AC zero and AC gain.If everything is slightly off start with the Vref trimpot.If DCV only is off, I can't help you.For adjustment locations refer to attached photo... good luck.

author: TomPet54
author_rank: Newbie
timestamp: April 21, 2019, 12:36:55 am
content: Thank you for your help.

author: shakalnokturn
author_rank: Super Contributor
timestamp: January 15, 2020, 11:05:18 pm
content: I'm posting here because it seems to be the only topic specific to this model on the forum and I don't want to start a new topic for a seldom seen meter. It should also apply to the MX50 and MX51 models.I dug my MX52 from whatever was on top of it, pushed the power key to see it blink the display and not want to come back on. Battery measured 2.5V.Inserting a fresh 6LR61 brought it back instantly, then when I wanted to switch it back off it was stuck on, insisting a while it would turn off sometimes, sometimes came back on by itself.Current draws measure 1.2 to 4.5mA (The true RMS conversion is greedy!) when on, 9 to 11mA when off!I replaced both 1µF/35V tantalum drops (one on each PCB), power switching Transistor Q1 (BC857B marking "3F") on main PCB and capacitor discharge transistor Q13 (BC847B marking "1F") on display PCB under LCD. Both were in low melting temperature plastic packages.I'm not saying it's fixed, only time will tell for sure.Standby current draw is now down to the 10-20nA range.
Siglent SVA1032x, EasySpectrum and 2 Port Measurements - Page 1
Forum section: electronics / testgear

author: NY2KW
author_rank: Regular Contributor
timestamp: January 13, 2020, 05:36:56 pm
content: I am anticipating the arrival of my Siglent SVA1032X. Up to now I have been using a SDR-Kits VNWA and one nice touch in their VNA software is a provision for an external S-Parameter Test Set via serial output for external relay. The test set can be easily built using a high quality, high isolation transfer switch. With the test set, the VNWA software allows quick calibration in forward and reverse directions giving the quick functionality for a full 2 port graphic report. Any chance Siglent would be interested in doing something similar with a future upgrade of EasySpectrum?Jerry NY2KW

author: hendorog
author_rank: Super Contributor
timestamp: January 15, 2020, 09:45:43 pm
content: Quote from: NY2KW on January 13, 2020, 05:36:56 pmHi Jerry,No idea about the future plans. However one way of doing what you want - since you are already using a PC - is to write software to control the switch and grab the data from the SVA. Then do the calibration calculations on the data.Scikit-rf is a library with full 2 port calibration calcs already implemented, I don't think it would be too difficult to do. I'm not sure what effect the transfer switch would have on the accuracy either. Certainly it would be an interesting experiment.
Yes, it's easy to add an external battery at 2465B NVRAM - Page 1
Forum section: electronics / testgear

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 13, 2020, 10:49:35 am
content: Why add it? :Before this operation I couldn't read the NVRAM on my programer and after I could do it .. I was happy!1) I used this Dremel headBefore begin .. insert the NVRAM in a socket to protect his fragile pins !!2) I started in front of the first "A" of text "DALLAS" ... this is where is located the pin 7 of IC(Luckily the DS1218 is a old DIL8 case with his large pins which will makes research easier)3) Carefully I came down and widen the hole very near of case until i seen the copper appear(It's the good moment to measure the internal battery voltage between this copper and pin 14 of the NVRAM)Then i widened it enough to be able to solder a wireMaybe a piece of advice : do not widen it too much on the side of the "D" and "L" of dallas so as not to short-circuit, with the dremmel head, the pins 7 with 6 or 8 of DS1218 because I don't know if that could kill it? .. see inside picture below4) I cut the branches of my socket to be able to easily pass the wireThen I soldered two wires:- positive on pin 7 of DS1218- negative on pin 14 of NVRAMMy final solution :I decided to keep the original NVRAM equipped of an external batteryFor the battery I chose this one on Amazon

author: Zucca
author_rank: Unknown
timestamp: January 14, 2020, 09:40:40 pm
content: http://www.worldphaco.com/uploads/TEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf

author: KCT_99
author_rank: Regular Contributor
timestamp: January 15, 2020, 02:06:02 pm
content: Thanks for sharing.
Service Manual GOS-620 - Page 1
Forum section: electronics / testgear

author: Mick B
author_rank: Regular Contributor
timestamp: June 10, 2018, 05:30:49 pm
content: I'm Looking for a service manual for a Gw Instek GOS-620.I would like to calibrate this unit so it's a little more than a boat anchor.I have spent days looking at manual sites I have found schematics but no service manual. I really could use some help. Thanks in advanced, Mick

author: ktulu
author_rank: Regular Contributor
timestamp: June 17, 2018, 03:59:35 pm
content: Hi. Did you find a service manual for this scope, or a calibration procedure? Thanks.

author: Mick B
author_rank: Regular Contributor
timestamp: August 02, 2018, 03:17:13 am
content: No I'm sorry to report, I have not had any luck finding a service manual yet.Ktulu are you looking for one also, If so any luck?

author: jknightandkarr
author_rank: Contributor
timestamp: January 15, 2020, 07:21:51 am
content: I was searching for calibration manual when I found this post. I actually added a copy of your desired manual, I happen to have the same scope.
Aligent DSO3202A Self Calibration Problem - Page 1
Forum section: electronics / testgear

author: mwbarth36
author_rank: Regular Contributor
timestamp: January 13, 2020, 08:23:06 pm
content: I have a DSO3202A scope which has the following problem, it will not run the 'Self Calibration' sequence. Continues to display the message "Disconnect all Inputs", even when all inputs are disconnected. What's more, looking at the inputs there is no sign of abnormal voltage or resistance. I suspect the problem is with channel 1. That is where the Self Cal. program starts, and it never advances past trying to get channel 1 input to indicate that there is nothing connected. Also, both channels operate normally with signal, and are right on, spec. wise. The only thing I can find is that when Channel 1 is switched from the 100 mV/div position to the 50 mVdiv position the reference is no longer 0, but goes to a -150mV level, and stays at that level when switching lower to the 20 mV/div position. All other positions of the vertical settings are 'spot on', and the scope appears to operate normally, with AC gain accurate on both channels. Normally I would expect the Self Cal. to correct problem at the lower setting on Ch. 1.......except the Self Cal. will not start because the program 'thinks' there is something connected to one of the inputs, presumably Ch 1.Of course, it appears impossible to get a circuit diagram for this scope. If wrong please let me know. I would appreciate any help I can get in solving this problem, as the scope appears in good shape other than this problem. I have opened the scope and compared measurements of components in the channel 1 and channel 2 attenuators, and can find nothing different between the two. Cannot power up the scope in the disassembled state to check voltages.Any ideas greatly appreciated!

author: tautech
author_rank: Super Contributor
timestamp: January 13, 2020, 08:54:39 pm
content: Check for damage on ch1 in 50 ohm mode as it's often where mistakes are made and inputs get overloaded.

author: mwbarth36
author_rank: Regular Contributor
timestamp: January 14, 2020, 09:43:12 pm
content: There is no 'Mode' setting for the DSO3202A scope. It is fixed at 1 Meg. Have replaced many 50 Ohm R's in scopes with a 50 Ohm input setting.

author: tautech
author_rank: Super Contributor
timestamp: January 14, 2020, 09:49:42 pm
content: Quote from: mwbarth36 on January 14, 2020, 09:43:12 pmOk yes you are right.https://literature.cdn.keysight.com/litweb/pdf/5989-2235EN.pdf?id=638687Dunno what to suggest then.Aren't these made by Rigol ?Maybe hunting out info on the old DS1052 might find something.

author: mwbarth36
author_rank: Regular Contributor
timestamp: January 15, 2020, 02:56:06 am
content: I have heard the DSO3202A is a re-branded Rigol but can not confirm. Even if true, appears just as difficult to find circuit diagrams for the Rigol mode. If anyone has any information on the Regol scope I would try to check out how similar the two are.
Function Generator? - Page 1
Forum section: electronics / testgear

author: mc1822
author_rank: Contributor
timestamp: January 14, 2020, 09:32:11 pm
content: Can a function generator be used in place of an audio generator?

author: Yansi
author_rank: Super Contributor
timestamp: January 14, 2020, 09:39:45 pm
content: It depends on what you mean by "audio generator".Please be more specific.

author: RoGeorge
author_rank: Super Contributor
timestamp: January 14, 2020, 09:53:15 pm
content: Quote from: mc1822 on January 14, 2020, 09:32:11 pmYes.

author: AG6QR
author_rank: Frequent Contributor
timestamp: January 15, 2020, 12:11:45 am
content: There is some overlap between function generators, audio generators, RF generators, and waveform generators. That doesn't mean they're all interchangeable.What requirements for frequency range, waveform shape, stability, spectral purity, power output, impedance, etc. do you have?Audio generators tend to cover the audio spectrum with sine waves at least. Function generators usually cover audio and significantly higher, usually with at least sine, square, and triangle. The total harmonic distortion of an audio generator may be quite low, often lower than a typical function generator, but check the specs.

author: 0culus
author_rank: Super Contributor
timestamp: January 15, 2020, 12:44:05 am
content: Yes, indeed. I have used my HP 3325B for audio signals in the past. It makes very nice clean sine up to 20 MHz from the front panel. Very low THD, though a quality audio generator might be lower.
Omegon Digistar microscope? - Page 1
Forum section: electronics / testgear

author: bogdan2014
author_rank: Regular Contributor
timestamp: January 14, 2020, 06:16:06 am
content: In search of a digital microscope I came across this one:https://www.omegon.eu/digital-microscopes/omegon-digistar-microscope-1x-600x-lcd-4-3-r/p,62236The datasheet is dated 11.2019 so I guess it's a new product. I wasn't able to find anything about it on the internet, so I'm asking if there's anyone that purchased this or other scopes from this brand.Specs:Digital camera HD 3.6 MP CMOS; Display: 4.3” HD LCD monitor; Resolution: 1080 x 720 pixel VGA; Aluminium rack-and-pinion column, stepless movement; Work distance 15 mm – infinite; Magnification 1x - 600x; 8 Longlife LED, adjustable brightness; Li-ion battery installed, continuous operation of up to 6 hours; Automatic shutdown: Off, 1 and 3 min.; Automatic shutdown of the LCD monitor: Off, 1, 3 and 5 minutes; Charging time: approx. 4 hours; Support thanks to a 64 MB micro SD card (not included); Cyclic recording: Off, 3 minutes, 5 minutes, 10 minutes. As soon as the memory on the memory cardis full, the first video is deleted and the new video is saved automatically; Multilingual. The following languages can be selected: English, Spanish, Japanese, German, French,Korean, Thai, Russian, Portuguese, Italian, Turkish, Hebrew, Czech, Chinese Traditional and ChineseSimplified; Photo mode: 5M, 2M, 1,3M, VGA.

author: tv84
author_rank: Super Contributor
timestamp: January 14, 2020, 10:45:13 am
content: https://www.u-obd.com/product/digital-microscope-4-3-screen/15 x 20 x 15 cmThe screen seems oversized (in the pic) for a 4.3" or all else is very tiny...

author: Psi
author_rank: Super Contributor
timestamp: January 14, 2020, 10:49:54 am
content: $65 for G1200 on aliexpress.https://www.aliexpress.com/item/32846603691.htmlTheir G600plus looks the same as your Omegon Digistar one with different color buttons for $39.65So it's likely a rebranded product.
2465B - test O4 fail 01 ... what's? - Page 1
Forum section: electronics / testgear

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 12, 2020, 10:18:03 am
content: After unsoldered and install a external battery on my NVRAM, I have this error message "test 04 fail 01 BU<F77F>"All seem work normally but how to correct that?Where can I find the table of all errors messages?

author: BravoV
author_rank: Super Contributor
timestamp: January 12, 2020, 10:24:50 am
content: Its all there in the service manual.

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 13, 2020, 12:24:55 am
content: In the service manual I found this :What does that mean"parity error on read"?What is the action to resolve this problem ?

author: wraper
author_rank: Unknown
timestamp: January 13, 2020, 12:45:24 am
content: Most likely NVRAM battery died thus cal data was lost.

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 13, 2020, 01:21:05 am
content: Strange ..I installed an external battery and I can read his datas on my programmerIs there a clue in the data that makes it possible to be sure that the data are real 2465B data or parasitic data due to a defective NVRAM?

author: wraper
author_rank: Unknown
timestamp: January 13, 2020, 01:24:19 am
content: Quote from: Joseph Bozzer on January 13, 2020, 01:21:05 amDo you have backup? If yes, program it and see if it helps. Or program some other backup (after copying current NVRAM content), there are some posted on this forum.

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 13, 2020, 01:25:29 am
content: Is there a clue in the datas that makes it possible to be sure that the data are real 2465B datas or parasitic datas due to a defective NVRAM?

author: wraper
author_rank: Unknown
timestamp: January 13, 2020, 01:27:18 am
content: Quote from: Joseph Bozzer on January 13, 2020, 01:25:29 amProgram known working data and see what happens. If it works, then current data was corrupted.

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 13, 2020, 01:29:33 am
content: ah ok ... i've a .bin dowloaded on web ... I will try to install it on a new DS1225AB ... I will order it

author: LazyJack
author_rank: Frequent Contributor
timestamp: January 13, 2020, 09:24:30 pm
content: It's been said a couple of times. Unless you do a full calibration on the scope it will not work properly. There is no point in loading data from other scopes. Calibration data is unique to the individual instrument. It may make the error message go away, but it will not work properly.
Brymen 869s for €172 ($192) - Page 1
Forum section: electronics / testgear

author: Trader
author_rank: Frequent Contributor
timestamp: January 21, 2020, 05:38:38 am
content: Brymen 869s for €172 ($192) as far as I know is a good price:https://eleshop.eu/brymen-bm869s-multimeter.html(I don't know the store)

author: eurofox
author_rank: Unknown
timestamp: January 21, 2020, 10:22:16 am
content: It is a good and reliable shop, this price is without VAT (Tax in Europe)

author: Fungus
author_rank: Super Contributor
timestamp: January 21, 2020, 02:43:46 pm
content: That's the price without tax, so really it's slightly more expensive than the official store:https://brymen.eu/shop/bm869s/

author: J-R
author_rank: Super Contributor
timestamp: January 22, 2020, 01:49:10 am
content: Welectron is doing €9.99 shipping to the US (vs €80 for Eleshop) so I think they might be a better deal if that is where you're located.
R&S FSB monitor - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: January 13, 2020, 06:07:04 pm
content: My prior note I had mentioned I bought an R&S FSP, it wasn't, it is an FSB. I don't know why spell check keeps changing it to FSP.On the back of this beast are connections labeled red, green, blue and then h-sync/comp sync and v-sync as well as composite video. I don't think the RGBs are standard component video but connect to an old RGB monitor that were around in the '80s. I remember RGB monitors from my CAD days. Anyone have experience with these type of monitors, unless it is component, please reply here or send me a PM.thanks
Environmental Test Chambers - Advice - Page 1
Forum section: electronics / testgear

author: pmankow
author_rank: Newbie
timestamp: January 13, 2020, 09:02:09 pm
content: Hello,I am looking to purchase a new environmental test chamber that has the minimum specs:> -40 to +60 degC transition in min 60 minutes> 1.2 cuft interior volume> Viewing window> Ports for instrumentation and wiring insertion> Multi-step programming> (optional) humidity control> ~$12kI have a unit from Thermotron but it is very very old and is starting to fail. I haven't really seen any information or discussion about this type of equipment online so I am looking for model recommendations, brand quality or experience feedback, etc...These are expensive pieces of equipment but absolutely vital for many industries that develop products for harsh environments.Your feedback is appreciated. Related information is welcomed.

author: EE-digger
author_rank: Frequent Contributor
timestamp: January 15, 2020, 02:56:15 am
content: We have a number of Tenney Jr. chambers. One runs -45C to 140C cycles 24/7.They seem fairly dependable except for a thermal fuse that needed replacement in two of them.We have all solid doors but a Google image search shows a number of units with windows. There are benefits to not having the viewing port in terms of heat loss and condensation.I'm not familiar with a new price but I think a used one can be had for around half of your budget. Probably country dependent. I'm in US.

author: wn1fju
author_rank: Frequent Contributor
timestamp: January 15, 2020, 05:35:29 pm
content: TestEquity has a number of chambers. We bought a mid-range model years ago at my workplace and was generally happy with it.
R&S FSP Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: January 09, 2020, 10:05:46 pm
content: Given the last thing I need is another boat anchor, what do you guys think about the R&S FSB? I have an HP 8568B with the preselector/preamp x 2 plus an 8566B, a 3562a and an Advantest R3131a with tracking generator. I'm just wondering if I would ever use the FSB once I got done playing with it.Thanks (hard to turn down T&M equipment especially when it is under $500).Jerry

author: egonotto
author_rank: Super Contributor
timestamp: January 10, 2020, 05:17:13 am
content: Hello,if you have rum er room why not.You can the R&S FSP also use if you want train for a championship in weightlifter or strongmanBest regardsegonotto

author: 0culus
author_rank: Super Contributor
timestamp: January 10, 2020, 05:52:02 am
content: The old saw about needing an oscilloscope to repair an oscilloscope applies to spectrum analyzers too. I'd say go for it if you have room.

author: cncjerry
author_rank: Unknown
timestamp: January 12, 2020, 08:16:44 pm
content: I got it home yesterday, bad back and all. It made it to the staging area in the family room. Wife loves it there. I swear my Acura was nose-up all the way home. It has some interesting features but the butt-ugliest color schemes I've ever seen. Here it is displaying a modulated trace from my new BP 8904a. By the way, I love that little 8904 (not so little) for audio work.One thing I can't figure out on the FSB is the monitor connections on the back. It has Red, Green, Blue, Comp Video, H Sync Comp Sync, Vsync but I don't think the RGB signals are the standard component connections. I remember there being an 'RGB' monitor a while back around the time the FSB was made. Any idea? It has a lot of interface options the HP 8566b doesn't have and I finally got the trace out of it. You have to read the trace as binary using GPIB and turn off the EOL character. I've yet to hook a floppy drive to it as it looks like it has a standard floppy connector on the back. It says you can attach up to three drives.Anyway, setting aside the back problems, I sort of like the beast. I have a real problem though, space-wise as between this and the HP 3562a I bought last week, I think I am over my floor loading limit for 6" of concrete in the lab.One other thing about the FSB is that it is sort of quiet compared to my other analyzers.Jerry

author: egonotto
author_rank: Super Contributor
timestamp: January 12, 2020, 10:04:16 pm
content: Hello,have fun with your new housemateBest regardsegonotto
sencore sc61 bad focus - Page 1
Forum section: electronics / testgear

author: pete g
author_rank: Regular Contributor
timestamp: August 16, 2014, 01:36:43 pm
content: I own a sencore sc61 that is developing a focus problem. has anyone on the forum had this problem? if so, can you offer any suggestions on a solution? thanks.

author: SES Audio
author_rank: Newbie
timestamp: January 12, 2020, 03:01:20 pm
content: I know it's an old post......but here's the fix in case you still need it ! LOL---------------------------------------------------------------Text pasted from WinSTIPS 2.1http://www.ServiceSoftware.com---------------------------------------------------------------SENCORE SC61Cannot Focus Trace , Stays BlurryJeff Stielau : 10/24/99 : Shoreline ElectronicsEither R22,23 Or 24 On The High Voltage Power Supply Board Has Opened. These Are All 2.7 Meg 1/2 Watters.---------------------------------------------------------------
Using both channels on the Siglent SDG2042X - Page 1
Forum section: electronics / testgear

author: level6
author_rank: Regular Contributor
timestamp: January 11, 2020, 03:06:01 pm
content: I'm looking at possibly purchasing a Siglent SDG2042XI need to be able to produce a set of simultaneous pulse waves from its two channels that look like this. Would this be possible with this unit?

author: gby
author_rank: Frequent Contributor
timestamp: January 11, 2020, 04:00:57 pm
content: I would think it would be straightforward. Define arb waveform for each of the signals, set the SDG2042X to lock the phase of the two channels and it should just output what you show over and over again. I have not done pulse waveforms like you show but I have done two moified sine arb waveforms at the same time phase locked and it works great.If you want to just send one cycle out that would get trickier. Some people have complained they can't trigger both channels simultaneously. I have not tried to do two Ch one cycle triggered at once.

author: level6
author_rank: Regular Contributor
timestamp: January 11, 2020, 05:00:34 pm
content: JDubU - Great thanks for the confirmation! I suppose any other method for creating arbitrary wave forms will work? Waveform Builder looks nice but not an expense I can afford right now.

author: tautech
author_rank: Super Contributor
timestamp: January 11, 2020, 08:56:15 pm
content: @ level6Arb waveforms can be created in EasyWave that is available on the CD that comes with the unit or downloaded from Siglent websites.Quick video tutorial:https://siglentna.com/video/use-easywave-software-siglent-sdg-series-waveform-generators/

author: level6
author_rank: Regular Contributor
timestamp: January 11, 2020, 10:03:01 pm
content: Thanks everyone for your help and information! My SDG2042 is now ordered :-)
Question about the Rigol DG1022Z DC Offset - Page 1
Forum section: electronics / testgear

author: level6
author_rank: Regular Contributor
timestamp: January 11, 2020, 02:44:36 am
content: The DG1022Z specs say it can output 10v pp. Does that it mean it could output a 0 to 10v pulse, or would it be limited to 0 to 5? Reading the manual and other information about the function generator I see how the DC offset can be adjusted, but there are no examples of creating a wave that starts at 0v.

author: screwbreaker
author_rank: Regular Contributor
timestamp: January 11, 2020, 01:08:09 pm
content: Is 20Vpp max. But with a DC offset it go down up to 10Vpp at the maximum DC offset of 5V.Yes, you can output a 0 to 10V pulse.What do you mean with, start at 0? no DC offset, or the phase?

author: level6
author_rank: Regular Contributor
timestamp: January 11, 2020, 03:01:10 pm
content: Thanks for the reply. By 'Starts at 0' I meant a pulse that goes from 0 to 10v.

author: screwbreaker
author_rank: Regular Contributor
timestamp: January 11, 2020, 05:48:28 pm
content: Yes. You need to set an amplitude of 10Vpp and an offset of 5V
Best prices for Siglent SSA3021X-Plus in US? - Page 1
Forum section: electronics / testgear

author: DrJoe
author_rank: Contributor
timestamp: January 03, 2020, 04:08:03 am
content: I've decided to get the Siglent with all the great reviews here and hours of reading all the threads! I missed any Black Friday deals. As anyone found a source with discounted price in US? All I can find are list - perhaps Siglent does MAP?I usually buy from Tequipment but they don't carry Siglent.Thanks,DrJoe

author: tautech
author_rank: Super Contributor
timestamp: January 03, 2020, 04:16:20 am
content: Saelig, hunt out their EEVblog members discount thread and ask for the discount code there.This one:https://www.eevblog.com/forum/testgear/equipment-discounts-from-saelig/

author: NY2KW
author_rank: Regular Contributor
timestamp: January 11, 2020, 02:42:58 pm
content: I found that Circuit Specialists will offer near same discount and free shipping.
REPAIRED : 2465B - led "A SWP TRIG D" flashing after NVRAM unsoldering - Page 1
Forum section: electronics / testgear

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 11, 2020, 12:31:46 pm
content: MY PROBLEM :After unsoldered my NVRAM and installed a IC socket , the "A SWP TRIG D" led begin to flash and all stopAfter consulting the troubleshooting diagram and associated tables (thanks MED6753) I found that nothing was to retire of themFIXING :following the advice of ALFONS , I tested the socket, pin by pin by lightly scratching the tracks next to them, and BINGO I discovery a track break ... only one out of 28 .. the tracks are so thin and fragileAfter fixing, my 2465B is working again but I have error 04 fail 11Normal, I had lost my calibration datas yesterday during the NVRAM unsoldered operation ... I don't always know why?

author: med6753
author_rank: Super Contributor
timestamp: January 11, 2020, 12:49:51 pm
content: Page 6-13 of the 2465B Service Manual.

author: Alfons
author_rank: Regular Contributor
timestamp: January 11, 2020, 01:22:48 pm
content: This error message occurred to me after I unsoldered the NVRAM and damaged a trace. So this happens when the NVRAM provides corrupt data. After I fixed the error, everything worked.

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 11, 2020, 02:45:59 pm
content: I unsoldered it yesterday and lost my calibration dataTrack damaged around the NVRAM? .... yes it's possible because it was difficult to unsoldered ... I will try that .... thanks

author: Alfons
author_rank: Regular Contributor
timestamp: January 11, 2020, 02:57:56 pm
content: I discovered it after I checked everything with a magnifying glass and, of course, measured it.

author: Joseph Bozzer
author_rank: Contributor
timestamp: January 11, 2020, 03:19:42 pm
content: Alfons you are my saviorI tested pin by pin by lightly scratching the tracks right next to them and BINGO I had a very little break ... only one out of 28My 2465B is working again but I have error 04 fail 11 (no calibration data)As I already found on my programer yesterday , I lost the calibration dataWhat will pass if I use an another .BIN coming of a new 2465B out the factory?(I'm not use this scope in professional domain, just for hobby ... extremest precision is not necessary for me)
NewAE H-field probe design - Page 1
Forum section: electronics / testgear

author: ifrenide
author_rank: Regular Contributor
timestamp: January 04, 2020, 01:48:16 am
content: Hello, I want to know 2 things about the newAE H-field probe,1-why they use 4 layer PCB , while it is possible to make it with 2 layers .2- In layer 2 , is there any contact bitween the 1mm track " the end of the ring"and the copper area ?best regards.

author: ifrenide
author_rank: Regular Contributor
timestamp: January 04, 2020, 02:24:14 am
content: is there anybody to help me here?

author: DaJMasta
author_rank: Super Contributor
timestamp: January 04, 2020, 05:50:49 am
content: It's been half an hour, just waiting a bit will yield better results.It's a 4 layer PCB because if you made it with two layers the entire track before the loop would act as an antenna and otherwise mess with the response of the probe, even holding it would effect readings significantly. With four layers, the outer layers (you only really need 3, but 3 layer boards are uncommon) act as a shield, and when stitched together with vias, effectively create a coaxial cable within the board (the signal track is surrounded by grounds).The track on layer two is stitched to the connector center pin pad on the top layer with vias on the left of the image.

author: Bud
author_rank: Super Contributor
timestamp: January 04, 2020, 06:38:31 am
content: Such a flat fat probe would be awkward to use, wouldn't it be

author: ifrenide
author_rank: Regular Contributor
timestamp: January 04, 2020, 08:36:57 am
content: no problem at all when we use it, and we cab cover it to make it a litle bit proffessional

author: ifrenide
author_rank: Regular Contributor
timestamp: January 04, 2020, 08:49:19 am
content: why there is a connection between the track and copper area of layer 2 and other connection between this truck and the other layers using vias ?

author: LazyJack
author_rank: Frequent Contributor
timestamp: January 04, 2020, 10:43:55 am
content: How would the circuit be closed otherwise, if there were no connection with the ground there?

author: TurboTom
author_rank: Super Contributor
timestamp: January 04, 2020, 11:29:46 am
content: For better sensitivity and common-mode (E-field) insensitivity (especially for the very small H-Field probes), the "professional" ones use a symmetrical output of the pickup turn, often also a two-turn design with a mirror-shape turn on the second inner layer, and a tiny,SMD balunclose to the connector.

author: EE-digger
author_rank: Frequent Contributor
timestamp: January 10, 2020, 11:46:47 pm
content: It's nice to see an SMA on the real product. Other probes lean toward connectors which can rotate (like SMB), which is convenient, but not so nice if you're driving it from an RF power amplifier for immunity testing ... and the connector unplugs