hybridfree/eevblog-posts huggingface dataset:
VA meter in power-meter form factor. - Page 1
Forum section: electronics / testgear

author: paul8f
author_rank: Regular Contributor
timestamp: January 03, 2021, 10:09:50 am
content: Hi all,just wondering if anybody can recommend a cheap Volt-ampere meter (similar to the type of basic power-meter you simply plug into a wall socket outlet)?I have a UPS device that measures both real power and apparent power, but I need something small and portable that measures reactive loads. The power-meter I have only measures real power (see photo).Any brand-names or sources would be greatly appreciated!Thanks,Paul.

author: threephase
author_rank: Regular Contributor
timestamp: January 04, 2021, 04:28:16 pm
content: I have not seen an energy meter of the plugin style in your pictures that will read reactive power / power factor. To do that I would be looking at either building in a multifunction panel meter into a box with a a plug and socket arrangement, or I would be looking at a clamp meter with that functionality. Either way it will not be as cheap a solution as your existing meter.RS Pro do a multifunction meter, that could be used;https://uk.rs-online.com/web/p/energy-meters/1797578/PCE have a single phase clamp meter, that would also work;https://www.pce-instruments.com/english/measuring-instruments/test-meters/clamp-meter-pce-instruments-clamp-meter-pce-pcm-1-det_60684.htm?_list=kat&_listpos=14You could also take a look at the Uni-T UT231 as I believe the PCE meter is a clone of this.

author: coppice
author_rank: Super Contributor
timestamp: January 04, 2021, 04:48:13 pm
content: In many of bigclive's YouTube videos he uses a compact low cost meter, branded as Hopi, which measures a extensive range of parameters. I don't know if that product is still available. Do you specifically need a reactive power display, or would displaying power factor and leaving you to work out the reactive power be OK? There are a lot more devices which display power factor than display reactive power, for some strange reason.
KSGER Hot Air Rework Station - Change heaterfrom 220V to 110 or 120V - Page 1
Forum section: electronics / testgear

author: rodness
author_rank: Newbie
timestamp: January 03, 2021, 03:59:27 am
content: This is my debut here on the EEVBlog forum.Checking some images of the KSGER Air Hot Rework Station boards (see attached), I found that:- The power supply is switched (110 / 220Vac);- The blower fan power is 24Vdc;- The power of the heater element is connected directly to the input network, passing through the control circuit and electronic switching (perhaps a TRIAC, I think).By default, this equipment is sold configured to be used at 220V.Here in Brazil the most common voltage to be found in homes and commercial establishments is 127V (known abroad as 110 or 120V).If I change the standard resistance for one of the same power, but with a working voltage of 110 / 120V, will the station work without any problem?In that case, I would buy the parts separately, and the gun assembly I would buy with the heater element at 110 / 120V.Thanks to anyone who can answer my question.

author: bob91343
author_rank: Super Contributor
timestamp: January 03, 2021, 05:50:19 am
content: My guess is that you will be fine if you change the heater element. There is nothing else that must run on 220, apparently.

author: rodness
author_rank: Newbie
timestamp: January 03, 2021, 03:35:28 pm
content: Quote from: bob91343 on January 03, 2021, 05:50:19 amThanksbob91343for the feedback.I believe as well as you that there will be no problems.I need to be sure to be able to buy without a doubt.I have seen other equipment that uses the same system: switched source for the DC circuit and bivolt voltage for the AC load (in this case a heating element), in this case it is an express coffee maker.
Everything Test Webinar Series by Rohde & Schwarz - Page 1
Forum section: electronics / testgear

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: November 17, 2020, 06:30:40 pm
content: Hi Folks,We launched a new webinar series called "Everything Test" today.It includes five tracks that cover the following topics:RF and Digital FundamentalsTest Instrument Selection and OptimizationMeasurement TechniquesDesign Verification and EvaluationAll together there are over 30 webinars. All free. All on-demand.Hope you all find it useful.-Rich

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: December 16, 2020, 08:57:35 pm
content: Hi Folks - I got a question on whether this was still available. They most definitely are, so I thought I'd bump this back up in case you have some spare cycles and want to learn on different topics.-Rich

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: January 06, 2021, 04:07:49 pm
content: Hi Folks - we've added a new section on "Digital Test" to the free webinar series:Digital Test: High-Speed Digital Test FundamentalsIt covers basic high-speed measurements while focusing on both time and frequency domain test equipment including eye/jitter analysis, Time Domain Reflectometry (TDR), power rail and PDN analysis, and EMI diagnostic/troubleshooting.-Rich
Rigol  DS1104Z-P  Can it be hacked？ - Page 1
Forum section: electronics / testgear

author: gurong60
author_rank: Newbie
timestamp: January 03, 2021, 03:12:47 am
content: Hello everyone, Can Rigol Oscilloscope DS1104Z-P be hacked?I want to upgrade the option, but the price of the option is sky-high.I purchased it in June 2018.
Tektronix TDS3012 Math Function ? - Page 1
Forum section: electronics / testgear

author: wd5jfr
author_rank: Regular Contributor
timestamp: January 02, 2021, 10:38:37 pm
content: https://odysee.com/@EETechStuff:f/calculate-energy-i2t-on-an-oscillocope:aThe above video demos the Math Function on a Rigol 1054Z to calculate energy consumption spikes with minimal effort. I could use something like that from time to time but I don't have a digital scope with math functions and my question is: does the Tektronix TDS3012 have this capability?ThanksHank

author: MarkL
author_rank: Unknown
timestamp: January 02, 2021, 11:09:25 pm
content: Yes, the TDS3012 can do it but you need the optional Advanced Analysis Module (AAM). The AAM allows arbitrary waveform math, including the example in the video of Intg(Ch1 x Ch1).The AAM can be purchased from Tektronix. There are also various hacks on how to enable the AAM and other feature sets on the TDS3000 series if you search around.
TEK 7603 flaky RO  - Page 1
Forum section: electronics / testgear

author: jonpaul
author_rank: Super Contributor
timestamp: January 04, 2021, 11:38:26 am
content: Bonjour a tous, Voeux Nouvelle Année!The 7603 is used with 7L5 or 7L12 SA plugins.All OK except both SA have a flaky RO, with several areas showing scrambled alphanumerics.If I push on the FP of the SA, the RO is fine. I cleaned the edge connectors of both, and put contact cleaner in the 7603 backplane sockets, No effect.Has anyone else seen this symptom, perhaps on other 7000 MF?Mille Mercis,Jon

author: doktor pyta
author_rank: Frequent Contributor
timestamp: January 06, 2021, 12:44:25 pm
content: Bonjour Jonmaybe a photo could push this topic further.BR
EXTCH 380222 found after 16 years, tear apart - Page 1
Forum section: electronics / testgear

author: Seekonk
author_rank: Super Contributor
timestamp: December 22, 2015, 10:09:27 pm
content: I had to replace a pipe and snake a drain behind my furnace the other day. I found my EXTCH 380222 meter that was lost probably in 1999 when I replaced the furnace. From date code this was probably purchased in 1995. This was one of the first meters with a supercap, Philips 1F 5.5V, instead of a battery. I got tired of getting on site and having a dead battery. A couple of minutes of charge and it was good for 20 minutes. It will charge from up to 230VAC or 9-20V AC or DC. Inside there is a 230/9V blue transformer. Main chip is a Maxim MAX138CPL with HEF4070 and TLC27L2CP. It still has the display protective plastic. It took a while for the 1F capacitor to reform after all that time but it seems to work fine now. I always wondered what happened to it.

author: cdev
author_rank: Super Contributor
timestamp: January 02, 2021, 08:43:52 pm
content: Still, now, bet you are glad it had a super-cap and not alkaline batteries in it!If it had had alkalines and they had leaked it would be an ugly ugly mess in there.
Barfield TT-1000A Service manual and Calibration procedure needed. - Page 1
Forum section: electronics / testgear

author: Paceguy
author_rank: Regular Contributor
timestamp: January 02, 2021, 08:21:06 pm
content: I know that this may be a long shot, but would anyone here know where I can find a copy of the service manual and calibration procedure for a Barfield model TT-1000A interturbine temperature tester used in the aviation industry? I found the operators manual but that's about all.
HP 5316A/B python driver - Page 1
Forum section: electronics / testgear

author: justanothername
author_rank: Regular Contributor
timestamp: January 01, 2021, 10:22:34 pm
content: Here is a litte python driver for the HP5316A counter I wrote.I hope it works haven't tested througly yet.usage example:Code:from HP5316x import HP5316Xinstrument = HP5316X("GPIB1::20::INSTR")instrument.measmode = instrument.MeasModes.PERIOD_Ainstrument.gatemode = instrument.GateModes.LONG_FRONTinstrument.triggerlevelmode = instrument.TriggerLevelModes.SET_LEVELinstrument.timeout = 10instrument.triggerlevel_a = 0.01instrument.triggerslope_a = instrument.TriggerSlopes.POSITIVEmeas = instrument.get_measurement()if meas is not None:print("raw answer: " + meas.raw)print("value: " + str(meas.value))print("unit: " + meas.unit)print("overflow: " + str(meas.overflow))del instrument
IDACOM PT500 Protocol Tester - Page 1
Forum section: electronics / testgear

author: rcrook
author_rank: Contributor
timestamp: January 01, 2021, 06:29:46 am
content: Hi Guys,Just go this IDACOM PT500 unit as a bit of a restoration project. Got it on ebay for $90 as not working and have done 5 minute quick check up on it.The power supply has no 5V or 12V and its giving 50V on the 24V rail. Plus the power transistors can cook an egg. About to go back out and pull all the cards and recheck the power supply to see if one of the cards it shorting out the supply.Couple of things I am missing I hope you may help with. I have been unlucky at finding any schematics for it at all. I have a bunch of user manuals and programming references but no service manual or schematics. If someone can point me to where I can get them I would be very appreciative.Second is the System Floppy disks. I have no idea on the condition if the hard drive and I cant even tell what sort of hard drive it is. Got some interest non-standard looking connectors. Either way, I would be a appreciative of anyone who can point me to images of the floppy disks that go with the PT500.RegardsRandall Crook
HP8656A EPROM BIN info needed - Page 1
Forum section: electronics / testgear

author: Ramede
author_rank: Newbie
timestamp: January 01, 2021, 12:22:09 am
content: Hello, looking for bin files (U5 EPROM MBM27128) for HP8656A board A11 (08656-60127), any clue where to find? thanks
Opinione on Gould Advance os3300B oscilloscope?  - Page 1
Forum section: electronics / testgear

author: gabri.peic
author_rank: Regular Contributor
timestamp: January 01, 2021, 08:08:53 pm
content: Hi i am keeping an eye out for a oscilloscope deal...Now I found this "Gould Advance os3300B" but i can't find any information about it so I want to ask for opinions since I am a complete newbie with oscilloscopes and don't know anything about them yet..Anyway guy wants around 50$ for it and he says that maybe it needs some switch cleaning but it should work... So I want to know if I should try buying it (i still need to ask for shipping costs)Thanks in advance.

author: ataradov
author_rank: Super Contributor
timestamp: January 01, 2021, 09:23:18 pm
content: Old analog scopes are not worth it at any price. There will be a bunch of people that like "warm analog feel" but as far as actually being useful for the purpose, they all suck. Unless you want to look as sine waves and not much else.LOL. I looked at the specs, it has 1 MHz bandwidth. Really, $20 oscilloscope kit from ebay will have better performance that this thing. EDIT: It looks like the actual bandwidth is 20 MHz. Still not worth it.Don't bother. The dud should be paying you to haul his garbage.
Keysight DSOX6004A Firmware file - Page 1
Forum section: electronics / testgear

author: kangalooj
author_rank: Newbie
timestamp: December 02, 2020, 08:01:30 pm
content: Does anyone has any version older than 7.31.20 which is current version!?Keysight deleted all old versions from its website!

author: kangalooj
author_rank: Newbie
timestamp: December 02, 2020, 10:03:42 pm
content: Thats perfect and 7.30 would be more than perfect

author: Mark
author_rank: Frequent Contributor
timestamp: December 31, 2020, 05:23:34 pm
content: Would you mind re-uploading the file please?Thank you.

author: tv84
author_rank: Super Contributor
timestamp: December 31, 2020, 06:10:15 pm
content: Here.
Meter Shopping Madness - Page 1
Forum section: electronics / testgear

author: Curious1
author_rank: Newbie
timestamp: December 27, 2020, 07:26:42 pm
content: I have a 25 year old Fluke 87 along with a few other dated meters. Although the Fluke still works great, I feel it's time upgrade before the wheels fall off the old wagon. I bought a Reed R5005(CEM DT-9979) a couple of years ago. Not bad, but I want something a little more top tier. The best alternatives I've found are the Fluke 287/289. Are there other meters of similar quality and features of the Fluke 287/289? Seeing min/max/avg readings on the screen without pushing a button to toggle between is a big plus if possible. Have I already found the right meter with the Fluke 287/289 or are there alternatives of similar quality or should I stick with the Reed R5005? I'm not partial to a particular brand if the quality is good.

author: Krampmeier
author_rank: Regular Contributor
timestamp: January 04, 2021, 02:30:38 pm
content: You'll find a lot of info about the advantages and disadvantages of the Fluke 287 / 289 here in the forum. I use one at work as my daily driver, and I have to admit that the 189 I had before (and the 187 I have at home) are the better tools most of the time. Faster turn-on time, easier and faster activation of secondary functions (e.g. diode of continuity buzzer), larger digits, better battery life, smaller and lighter package, ...Of cause, the 289 gives you the feeling to have the best and most expensive handheld DMM there is, but does it really provide a benefit for you? I have used the logging / graphing just once in 5 or 6 years. Usually, I'd rather use a Keithley 6500 or a scope instead, which provide much more possibilities in that area. The activation of the secondary functions via the menu is annoys me very often, because diode tests and continuity checks are just so much more common. And the 289's low-ohm function does not make very much sense to me, as there are no Kelvin connections and the value settles very slowly on my meter.I'd buy a second hand 187 again any time.

author: Martin72
author_rank: Super Contributor
timestamp: January 04, 2021, 11:01:49 pm
content: QuoteWe got a 289 too and I hate this thing...Boot time on a handheld multimeter...wtf ?!Irritating menu-style...No, not my friend, although it got some benefits like capacitor measuring up to 40mF...But it is the only model in the fluke portfolio, which got trms up to 100khz afaik.100khz trms you can get also from brymen, several models offer this.Me, I got the 869s model and let it calibrate external - the protocol shows excellent results, so it musn´t have to hide from the fluke ones.

author: E-Design
author_rank: Regular Contributor
timestamp: January 05, 2021, 01:11:04 am
content: You cant go wrong with the 289.. its a nice meter. I've had one for a few years and no issues. Sure it has a bit of boot time... meh.

author: 2N3055
author_rank: Super Contributor
timestamp: January 05, 2021, 11:09:32 am
content: Quote from: Curious1 on December 27, 2020, 07:26:42 pmBudget ?Would you like/need graphics display ?Logging ?
Humming Noise Maynuo 9712 - Page 1
Forum section: electronics / testgear

author: gae_31
author_rank: Contributor
timestamp: December 31, 2020, 12:12:00 pm
content: Hi All,I just received the Maynuo 9712 load and after turning on, you immediately hear a humming noise.I find it hard to believe that this is to be considered normal.Did anyone experience the same?
I disrupted my DE-5000 - Page 1
Forum section: electronics / testgear

author: gege1244
author_rank: Newbie
timestamp: August 26, 2017, 07:12:18 pm
content: HelloI made a mistakeThe DE-5000 that I own measures too low the resistances of 10 ohmsI wanted to set VR2 which did not change anything, but when you change it, the value of the point TP1 changesI got 1,300 Volts by positioning VR2 as originally (more or less)Can give me the value you find on your devicesThank youA user who likes this product

author: chronos42
author_rank: Regular Contributor
timestamp: August 27, 2017, 07:04:31 am
content: Hi,I measure 1.30688V at my DE-5000 with a Brymen 869S.

author: gege1244
author_rank: Newbie
timestamp: August 27, 2017, 07:16:33 am
content: OKThank you for this information.If I could have another answer, that would be reassuring.If there is a French on the forum, I translated the whole manual into French.Thanks again

author: georges80
author_rank: Frequent Contributor
timestamp: August 27, 2017, 05:01:59 pm
content: 1.30945V measured from TP1 to Battery Ground (on PCB) with a Fluke 8845A. After a few minutes to ensure settling. PCB temperature approximately 27C (warmer morning) in case that affects anything...cheers,george.

author: gege1244
author_rank: Newbie
timestamp: August 27, 2017, 09:23:46 pm
content: OKThank you for all those informations.I will be able to set VR2 to this value.If one of you knows what it is, it would be good for everyone.For me, it's great, I think my DE-5000 will recover confidenceThanks again to everyone

author: tppc
author_rank: Regular Contributor
timestamp: December 29, 2020, 10:21:05 pm
content: Quote from: gege1244 on August 27, 2017, 07:16:33 amHi there,I just received my DE-5000 this morning.Gege1244, if you agree to share your work, please post your translated manual here, it might help me and other frenchies.Kind regards

author: BravoV
author_rank: Super Contributor
timestamp: December 30, 2020, 06:49:39 am
content: Check this out ->https://www.eevblog.com/forum/testgear/mastech-ms5308-lcr-meter-with-esr-measurement-on-discount-at-the-moment/msg1542980/#msg1542980

author: tppc
author_rank: Regular Contributor
timestamp: December 31, 2020, 03:10:23 am
content: Hi there,Thanks for the link.Actually, I was just looking for a french version of the DE-5000 manual.Regards.
Siglent SPD3303X-E Lockups - Page 1
Forum section: electronics / testgear

author: gussy
author_rank: Contributor
timestamp: December 30, 2020, 06:49:26 am
content: I couldn't find any recently threads on this power supply so here's a new thread.Recently, after about 4 days of being powered on, the front panel UI and display on my SPD3303X-E completely froze up. I took a video but there's not much to it, just me pushing every button on the front panel and nothing happening. The outputs were still on and working fine, at least my DUT didn't die. Obviously turning it off and on again fixed the issueDoes anyone know if this is a known issue, or something anyone has seen before? I'd consider sending the unit back to Siglent or at least shooting them an email, but I also just recently "upgraded" this power supply (yes I know, I very likely caused the lockup).

author: tautech
author_rank: Super Contributor
timestamp: December 30, 2020, 07:05:30 am
content: Can you be sure you didn't press the Lock feature ?

author: gussy
author_rank: Contributor
timestamp: December 30, 2020, 10:02:39 am
content: There's a lock feature?It's definitely possible, although the V/I readings weren't updating and they normally bounce around a lot with this DUT. I looked at the video I took again and there's no lock icon on screen.

author: Elasia
author_rank: Frequent Contributor
timestamp: December 30, 2020, 01:33:36 pm
content: I can confirm it does lockup every once and awhile and has to be rebooted... its.. an annoyance
SVA1032X Cal Kit  - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: December 26, 2020, 06:12:59 pm
content: What are the correct parameters for the User1 and User2 cal kit parameters?For example from VNA User1:Define OpenParameter 0 C0*1e-15FParameter 1 C1*1e-27F/HZParameter 2 C1*1e-36F/HZ^2Parameter 3 C1*1e-45F/HZ^3Parameter 4 DelayFrom type N Cal kit parameters:See image below.Parameter 0 C0 50Parameter 1C1 3013.39Parameter 2C2 12757.35Parameter 3 C3 -2819.75Parameter 4 Delay 74.0853Does the VNA expect that the entered value for Parameter 2 (C2) be 12757.35 or C2/C1 which is 1257.35/3013.39 or 4.2328? I could just do a cal with both values and see what makes sense but thought I would ask first??Thanks in advance for any enlightenment.Best & Happy Holidays,

author: hendorog
author_rank: Super Contributor
timestamp: December 26, 2020, 08:00:11 pm
content: The labels on the VNA are incorrect, the C1 should not have been repeated three times.I reported this a while ago, so it might have been missed.So I think your parameter numbers are correct. Enter the values directly.

author: mawyatt
author_rank: Super Contributor
timestamp: December 26, 2020, 08:17:54 pm
content: I tried using the ratioed numbers and couldn't get past the Open Cal, so suspected these were not the proper format. C0,1,2,3 from the kit went thru the calibration fine and are giving reasonable results.Thanks for the confirmation.Best & Happy Holidays,

author: Noy
author_rank: Frequent Contributor
timestamp: December 30, 2020, 12:08:58 am
content: Regarding putting in my calkit parameters i have also a question:Got my SDR Kits Rosenberger "Calkit" i know it's a generic one but original ones are to expensive for "Hobby use" :-(And i think they are decent enough for my useage (hopefully)..Now my problem is, how can i get the Calkit Parametes inside my SVA1032x? I saw user calkit buttons but the Parameters were unclear for me.Or should i telnet in and refine / manipulate one of the saved "original" Calkits with my parameters?Here are the calkit parameters:https://www.sdr-kits.net/documents/Rosenberger_Female_Cal_Standards_rev5.pdfCan somebody elp me to verify which parameter inside the pdf is the correct parameter for the SVA user calkit (C1,C2,C3...)?
Tek AM503B with old A6302 current probe - Page 1
Forum section: electronics / testgear

author: erichousetkc
author_rank: Newbie
timestamp: December 14, 2020, 10:49:11 am
content: Hi,I am considering to exchange my faulty AM503 to AM503B. When I check AM503B instruction manual, I noticed that for older A6302 probes (Mine has SN. B013004), the specs are not warranted.Do anyone has any experience with regards to this?The manual also states that this is due to a change in the input connector and can be updated, which obviously is no longer available. I want to know what is changed at the input connector and whether it can be implemented by myself.

author: MarkL
author_rank: Unknown
timestamp: December 14, 2020, 06:42:13 pm
content: I have two A6302 probes, one below B050000 and one above.The connectors are different. The older connector is marked Amphenol 165-9, and the newer one has no markings on it at all. The older one is made of anodized aluminum, according to the datasheet, and the newer one is a much heavier material, I'm going to guess chrome plated brass. (Why Tek chose such a chunky Mil-spec aircraft connector for a bench probe is beyond me.)I don't see any significant performance differences on a AM503 between the two. I would recommend you do the performance verification procedure to see if there's anything odd with your probe and AM503B combination.Maybe they moved away from that specific Amphenol connector and went with a different mating connector on the AM503B, possibly because of contact integrity issues or maybe it caused some issues. But that's only a guess. Wiggle the connector while doing your performance verification.

author: erichousetkc
author_rank: Newbie
timestamp: December 16, 2020, 03:34:45 pm
content: I will surely test that when I have it. Thanks for the input.

author: kbrill
author_rank: Contributor
timestamp: December 29, 2020, 09:36:42 pm
content: I have noted inconsistencies in operation of older serial # 6302 & 6303 probes most particularly when used / attempted to use with AM503A & AM503B . At least one probe which failed to work with 503A when retested with a much later production 503B worked just fine . Lower serial # probes in all but the example just given have been the common factor with problems .I have searched exhaustively for more information and none seems available from Tektronix . The excerpt from the Tektronix manual you posted is all I have managed to find .In almost all cases problematic probes type 6302 & 6303 have worked fine in the original non digital readout AM503 .I have 6 - 6302 & 5 - 6303 probes, 14 - 503 & 1 - 503b my experience tracks well with that of 2 surplus dealers I know both were unaware of the lower serial # issue .Does anyone have additional information or insights ?
Use generic USB logic analyzer with Siglent 1104X-E - Page 1
Forum section: electronics / testgear

author: puterboy
author_rank: Regular Contributor
timestamp: December 29, 2020, 08:52:44 pm
content: Is it possible to interface a (cheap) generic USB logic analyzer with the Siglent 1104X-E?The Siglent-branded SPL1016 seems way overpriced for just a dongle that samples 16 digital signals and outputs them to the scope -- especially when reasonably capable USB LA's can be bought on Aliexpress for <$100.Any thoughts?
TTI/Thurbly Thandar TSX3510 - Potentiometer Designations - Page 1
Forum section: electronics / testgear

author: TheBay
author_rank: Unknown
timestamp: October 18, 2020, 07:46:02 pm
content: I've had a 1990s Thurlby Thandar TSX3510 for quite a few years, I recently gave it a check over and replaced a couple of capacitors.I have the service manual for this that TTI sent me ages ago, but on my PCB revision there are no designations on the silk screen for the bank of potentiometers on the main board which is really odd. I think they might be printed under the pots and without removing them I have no way to see which is which.I have asked TTI for the information but they haven't replied (They are usually very helpful with their products) so I'm assuming its due to the current global situation.Does anyone have a diagram/document for the identification of these potentiometers? I've had a good look on Google for the TSX3510/1820 but nothing comes up and I cannot find any pictures of the main PCB.The control panel pots are labelled and I can adjust those accordingly but I need to adjust some on the main board.I know a few on here have the TSX3510, cheers.

author: Resonant
author_rank: Contributor
timestamp: December 29, 2020, 12:37:50 pm
content: I also needed to trace out the location of the Pots and this as far as I can work out.

author: TheBay
author_rank: Unknown
timestamp: December 29, 2020, 06:37:15 pm
content: Quote from: Resonant on December 29, 2020, 12:37:50 pmHope this helps...
Fluke 8920A 8921A TRMS parts?  - Page 1
Forum section: electronics / testgear

author: jonpaul
author_rank: Super Contributor
timestamp: December 29, 2020, 06:35:50 pm
content: Hello restoring Fluke 8920A TRMS meter, need the TRMS converter Fluke PN 489.377 and Q6 - Fluke PN 376475Anyone have a cross ref or the parts eg parts donor unit?Many thanks 'Jon
energy/power meter HT ENERGYTEST 2020 - Page 1
Forum section: electronics / testgear

author: fant
author_rank: Contributor
timestamp: December 29, 2020, 11:48:20 am
content: Good morning;I have this instrument ( a multifunction energy meter that analyze the mains for power, energy, power factor and harmonics ) that suddenly has begun to show on the ampere function a malfunction: during measurement of the current with the current clamps, the current indication begin to indicate the current from 5A and higher.At 4,9 A and lower the indication is always 0,0 A.Opened and following the current path, the signal (sinewave of the current value ) is existing with the correct amplitude, both above o below 5 A, up to the CPU analog input ( pin 95, named P10_0/AN0 of the RENESAS M30624FGFAP CPU; also the reference voltage of 4,485 V on pin 98 named VREF is correct ).Any idea or schematic ?Thank you in advance
Recommended DC Block? - Page 1
Forum section: electronics / testgear

author: IDEngineer
author_rank: Super Contributor
timestamp: December 27, 2020, 06:56:10 pm
content: I'm looking for a ready-made DC block to protect the input of my spectrum analyzer. The SA goes to 13GHz and I'd like to reach as low as possible, which may require more than one block. I'd like to go N male to N female.The Weinschel 7003 is pretty wide for the top end (9KHz-18GHz) but I'm having trouble finding where to purchase one. I presume there are other reputable units out there but searches aren't turning up a whole lot. The usual sources (TEquipment, Saelig) don't have much in terms of selection.I'm also wondering about options below 9KHz.Yes, I could build one, particularly for the lower frequencies, but for the high end I suspect dialing in the wide range impedance performance is more than just soldering a large value cap.Any recommendations appreciated. Thanks!

author: tggzzz
author_rank: Super Contributor
timestamp: December 27, 2020, 07:54:55 pm
content: Have a look at MiniCircuits blocks.Be aware that DC bloc!is won't completely protect the input. When you connect a DC voltage there will be the obvious RC exponential transient. The larger the capacitor, the bigger the transient, i.e. the lower the cutoff, the bigger the transient.It is good practice to measure a source before connecting it to an SA input.

author: IDEngineer
author_rank: Super Contributor
timestamp: December 27, 2020, 08:20:12 pm
content: Yep, that's my standard practice. I check signals on a scope before connecting them to an SA. But I've long thought it would be good insurance to ALSO have a DC block in the circuit. A slip of the finger on the touchscreen of the AWG while adjusting amplitude, for example, could instead tweak the offset and result in a DC bias. (Those touchscreen "buttons" are darned small.) SA's can be expensive to repair, preventing a single damage incident could more than pay for a DC block.I looked at MiniCircuits, but IIRC they only have one N connector option and it has a rather high bottom frequency.

author: tggzzz
author_rank: Super Contributor
timestamp: December 27, 2020, 09:01:55 pm
content: I'm a belt-and-braces guy tooI usually leave a sacrificial N-SMA converter on the SA, and attach an MiniCircuits 10MHz-18GHz SMA connector blocks to that. If I want below 10MHz, I can use other instruments.

author: rfclown
author_rank: Frequent Contributor
timestamp: December 28, 2020, 06:39:47 pm
content: I'm like tggzzz, I use SMA blocks. I know that's not what you asked for suggestions for, but they are way easier to come by. I don't have anything that wide range to suggest (so why am I posting?). My go-to are some MiniCircuits 100k-8G that I have: BLK-89-S+. Last N DC block I bought at work was MiniCircuits; seems like whenever I've looked, they've been the best bang for the buck. But that one was only needed for SATCOM. When I need to go higher I have an HP 11742A 45M-26.5G, but I don't often pull it out because it would be expensive to replace (I got it relatively cheap on eBay) so I'm overly careful with it.
Looking for schematic of Victor 88C multimeter - Page 1
Forum section: electronics / testgear

author: thanibee
author_rank: Newbie
timestamp: December 11, 2020, 05:40:15 am
content: There are two issues in my multimeter.1. My multimeter voltage reading are not accurate.2. In DC voltage range, without any voltage source connected, the reading keeps on increasing.Did open up the meter. There are too many pots that are soldered and two under the LCD. Need schematic to understand the same or anyone who have worked on these issues, kindly throw some insight.Any help appreciated.Thanks,Thanibee

author: scopeman
author_rank: Frequent Contributor
timestamp: December 27, 2020, 11:28:05 pm
content: See Attached. The Minipa 2082C is the same meter.SamScopemanW3OHM
tek PG506 calibrator generator voltage error - Page 1
Forum section: electronics / testgear

author: gifsim
author_rank: Newbie
timestamp: December 26, 2020, 10:26:51 pm
content: good morning to the whole groupI ask for help because I'm not understanding anything anymore ....I have a pg506a that makes a strange defectI turn on the pg506a and connect an oscilloscope (I have tried with various oscilloscopes) to the amplitude output in standard modethe output voltages are not correct (they are higher) in any position of the amplitude switchif I extract and rotate the pot variable out nothing changes and the display remains fixed on a valueif I connect a multimeter or a battery powered oscilloscope (ths730) to the amplitude output, everything works correctlythe voltages are correct and the pot variable out works as expectedIt seems to be a ground faultI connected the pg506a to the extender from the tm504 to measure the supply voltages and they are all correct (I followed the service manual)I hope I have explained myself as well as possibleask if anyone have any suggestions to be able to understand the problemthanksSimon
Siglent or Rigol - Page 1
Forum section: electronics / testgear

author: Lawsen
author_rank: Frequent Contributor
timestamp: December 26, 2020, 09:06:30 pm
content: Siglent or Rigol; which is a better brand in test and measurement gear? I have a Siglent oscilloscope in 2 channels at 200 MHz. I sacrificed the 2 extra channels for more bandwidth at 200 MHz. Rigol has a nice 4 channels, while at 50 MHz, only good for robot control builds.

author: Martin72
author_rank: Super Contributor
timestamp: December 26, 2020, 09:12:44 pm
content: Ah,this will be fun...

author: tautech
author_rank: Super Contributor
timestamp: December 26, 2020, 09:26:39 pm
content: Quote from: Lawsen on December 26, 2020, 09:06:30 pmSo exactly what capability do you need to fit your available budget ?Max budget ?BW ?More channels ?MSO ?Display size ?Touch and/or mouse control ?Web server ?Bode plot ?It's not hard to find DSO's that meet ones needs however when on a limited budget that's another matter.

author: Elasia
author_rank: Frequent Contributor
timestamp: December 27, 2020, 01:52:22 am
content: Quote from: Martin72 on December 26, 2020, 09:12:44 pmPass theReally though, Siglent, Rigol, GWI, and others make good kit in the same ballpark that in general will get the job done.. easiest method.. take your rarest requirement that is a must have and use it to eliminate everything elseLike in my case... CAN FD.. pretty much left just siglent at this price point.. most everything else is big bucks

author: 2N3055
author_rank: Super Contributor
timestamp: December 27, 2020, 10:47:57 am
content: Blombla or Bloblob

author: Fungus
author_rank: Super Contributor
timestamp: December 27, 2020, 03:55:50 pm
content: Quote from: Lawsen on December 26, 2020, 09:06:30 pmWell... Rigols are cheaper than Siglents so how to compare directly?What budget range are we talking about? What do you need it for?If you want the very "best" brand then: Neither.IOW... YMMV.PS: I just bought a $500-ish 'scope and it wasn't either of the above.
Tektronix 465 repair thread - horizontal flat line  - vertical output board? - Page 1
Forum section: electronics / testgear

author: seba78
author_rank: Newbie
timestamp: December 27, 2020, 03:23:06 pm
content: Hello,I'm trying back to life old Tektronix 465 scope.PSU: All rails in specProblem: horizontal flat line that cannot be moved up-down (only left right).Triggering: working, after applying calibration signal it grab trigger lamp.Time base working (on slow i can see trace sweeping)applying signal to A & B channel have no affect even, switching settings on A & B vertical have no affect on line (not even simplest smallest jump).I visually inspected Vertical Output Board (don't see anything obvious) .Actual problem looks like output of method described in general tektronix service manual (please take look at attachment)Could You give me any hint where to start in nailing it down?
How to Zero Ohm offset on BryMen BM257s - Page 1
Forum section: electronics / testgear

author: imk
author_rank: Regular Contributor
timestamp: December 26, 2020, 03:20:46 pm
content: Hello,So I have a nice little Brymen BM257s and pleased with it i am.Only problem is when i touch the test leads together it reads about 1.9 ohms.Hence measuring small resistors I am always having to subtract 1.9 ohm.I have looked and looked but can't find a way to zero out this offset.Have i missed something or is this a missing feature in the BM257sMany thanks imk

author: wraper
author_rank: Unknown
timestamp: December 26, 2020, 03:23:15 pm
content: And for what you have a REL button? How about reading the manual? 1.9 ohm sounds too large though.

author: imk
author_rank: Regular Contributor
timestamp: December 26, 2020, 04:00:18 pm
content: hello wraper,I must say i don't use this nice mm enough to get use to all the feature and now i am the wiser re the REL button.Problem it takes a few measurements to zero out the offset but after some practice i think i have it mastered.Measuring low ohms however is still very problematic, as when the offset is set at zero ohms across the leads.The next across leads measurement can often be as much as 0.5 ohms out again.Which i guess is pretty much standard when trying to measure such a low resistance with a mm like this.Many thanks imk

author: wraper
author_rank: Unknown
timestamp: December 26, 2020, 04:45:00 pm
content: Try cleaning probes and measurement points with alcohol. You might need to press probes quite hard to get stable contact resistance.

author: radiolistener
author_rank: Super Contributor
timestamp: December 26, 2020, 05:54:07 pm
content: my original Brymen BM867S golden probes has 0.8 - 1 Ohm.From my point of view this is too much, isn't it?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 26, 2020, 08:32:05 pm
content: uh ??my flukes 189, gossen etc ... have at least 0.1 to 0.33 ohms at maximumnever saw something higher than this ??
Looking for documentation for a Beckman 9012 Oscilloscope. - Page 1
Forum section: electronics / testgear

author: michalism
author_rank: Regular Contributor
timestamp: October 22, 2019, 09:44:53 am
content: Hello!I have bought an old Beckman Industrial 9012 scope from ebay. I should receive it today...really anxious about it!! This should be by first operational analog osciloscope!I tried to find the operation and/or service manuals for it, but I had no luck.Does anybody here has any idea where to look for?I've seen some threads that suggest that the Beckman is really a scope made by others (like Hung Chang), but I was not able to find a reference for the particular model I am interested in.Any suggestions?thank you very much in advance!!!Michalis

author: michalism
author_rank: Regular Contributor
timestamp: October 29, 2019, 11:28:59 am
content: Hi.it seems this scope is identical to wavetek 9012....any docs for that model?thanks

author: Old Printer
author_rank: Frequent Contributor
timestamp: October 29, 2019, 12:46:52 pm
content: First quick look didn't turn up anything, even BAMA is bare. When buying an old analog scope it is always good to check for availability of at least service manual before buying, unless it's free. A good reason to pay a bit more for a Tektronix, as many of the manuals are easily available. These 25 year old scopes are on the verge of needing work, if not already, and that can be very difficult without a decent service manual.

author: shakalnokturn
author_rank: Super Contributor
timestamp: October 29, 2019, 08:28:56 pm
content: Also look for similar Hung Chang, Protec, Votcraft models. Not always an easy task as there are usually many revisions using the same model number in each rebrand...Don't neglect the not specifically labelled "service" manuals if looking for schematic. I have a French copy (downloaded I believe) of the Beckman 9020 user manual that includes schematics.

author: michalism
author_rank: Regular Contributor
timestamp: November 04, 2019, 02:56:15 pm
content: thanks for the replies.I'll keep looking hoping to find some kind of reference....at this point the scope seems to work fine, and does not need any work. let's see...

author: Gae
author_rank: Contributor
timestamp: December 26, 2020, 09:31:01 am
content: Hi,after a year ...How does the scope works ?Did you get the manuals, schematics ?I can buy one for less than 100€, is it a good deal ?Thanks.
MCX inline cable attenuator - Page 1
Forum section: electronics / testgear

author: theoldwizard1
author_rank: Regular Contributor
timestamp: December 27, 2020, 12:48:32 am
content: I think I am on a unicorn hunt !The SainSmart pocket 'scopes (DSO211, DSO212, DSO213) aren't bad to automotive diagnostic. Various inductive device give some pretty serious back EMF which may not be clamped until a voltage higher than those little 'scopes can handle.Does any one make an inline MCX 10x attenuator ?Best would have a 6" pigtail with MCX male connector on one end and a 6" pigtail BNC male.

author: DaJMasta
author_rank: Super Contributor
timestamp: December 27, 2020, 04:43:11 am
content: I don't know of MCX versions, but SMA versions are fairly plentiful and BNC 10dB attenuators are fairly available too. I'd look for a combination of an MCX to SMA/BNC adapter and then one of the more standard attenuator formats.I do see one minicircuits MCX attenuator on ebay, only 4dB though, so they are probably available as custom order from them, but I imagine not cheaply.
How to make a signal generator output a given modulation like DMR - Page 1
Forum section: electronics / testgear

author: The_Spectrum.A_idiot
author_rank: Regular Contributor
timestamp: April 22, 2020, 01:29:32 pm
content: Dear All ,again a quite difficult question to answer as I presume ,So I have a DMR homemade repeater(MMDVM) and I would like to test the RX side of things of decoding signals properly.the most frequent solution is to key the repeater locally(almost line of sight and 30m away with a radio without antenna at low power ) and then ask a remote station to help you make the BER as close to zero as possible so that all stations at the far away coverage are able to be decoded successfully.But I would like to make it in a better way to ensure that even at the lowest radio sensitivity can go then I guess I would have the most optimal decoding posible.So my question is can an external signal generator with a modulation input of 600Ω can be used ,and if yes how could I extract this modulation for DMR successfully?also for more help the signal generator in question is a marconi instruments 2019Aand the repeater is an MMDVM homemade repeater that is being used to tune perfectly the RX side of things.Thank you in advanceThe_Spectrum.A_idiotp.s:Sorry in advance if I am in the wrong sup-part of the Forum ...

author: Simon
author_rank: Unknown
timestamp: April 22, 2020, 03:41:35 pm
content: I have deleted your other identical topic.

author: M0HZH
author_rank: Regular Contributor
timestamp: April 22, 2020, 04:02:43 pm
content: If I would want to test my MMDVM I'd chain up some attenuators between a DMR transmitter and the receiver. I have a 40dB high-power one and a programmable 128dB unit, radio outputs 30dBm on the lowest setting so technically -138dBm is possible. There will be leakage and you won't get much level accuracy, but it should be more than enough to tweak best reponse from a receiver.On the other hand, usually high BER rates are caused by the (cheap) MMDVM local oscillator being slightly off frequency, which results in offsets of center RX and TX frequencies. A frequency counter and a bit of math would probably would be more useful to minimise BER in my opinion. Pi-Star has settings for RX and TX offsets in the configuration menus.Keep in mind the receiver in the MMDVM units is mediocre and easily swamped by EMI or other strong perturbing signals. Mine can't get BER below 1% or so just because it sits next to the NAS / UPS.

author: Lord of nothing
author_rank: Super Contributor
timestamp: December 25, 2020, 05:14:22 pm
content: QuoteI have some question about that.Can you help me?
Memoscope EA-1024 - Page 1
Forum section: electronics / testgear

author: Vondrobac
author_rank: Newbie
timestamp: December 24, 2020, 10:33:38 pm
content: HelloI bought this unit even i dont know what is itdefinitely has to do something with oscilloscope? Cant find anything on internet, so any info is welcome.Regards

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: December 25, 2020, 01:24:42 am
content: Must be an early digital storage system. 1024 would correspond to either horizontal or vertical resolution. Perhaps similar to first Nicolet DSO, but without the scope, so it just has A/D and D/A.

author: bob91343
author_rank: Super Contributor
timestamp: December 25, 2020, 07:07:58 am
content: Many decades ago Hughes manufactured the Memoscope which was an analog oscilloscope with storage, something very rare back then, maybe around 1960.I never saw one so can't comment but it was a bit of a Tektronix clone in some respects.

author: mxhll
author_rank: Contributor
timestamp: December 25, 2020, 04:47:49 pm
content: This paper describes how it was used to record a single transient event and replay it at x100 time delation. (Page 9)https://inis.iaea.org/collection/NCLCollectionStore/_Public/16/064/16064399.pdfThey recorded the event with the Memoscope and fed it into KM64 storage oscilloscope for displaying or printed it with a XY plotter
HP 431C question - Page 1
Forum section: electronics / testgear

author: WB8PFZ
author_rank: Regular Contributor
timestamp: December 24, 2020, 07:54:22 pm
content: I just purchased a nice 431C power meter. It works and seems to be pretty accurate when driven by my HP generator. My question is why is the zero control and vernier so sensitive? Is this common or is something out of wack? Thanks Mike

author: 0culus
author_rank: Super Contributor
timestamp: December 24, 2020, 08:57:51 pm
content: These aren't terribly complex inside, (I have a 431B that is out of service because it will not work properly with the thermistor mount I have...said thermistor works fine with my 432), so go grab a scan of the manual and run through the adjustments. Make sure there isn't excessive ripple on the power supply.
ITECH IT8511A+ - problem with OCP and OPP modes - Page 1
Forum section: electronics / testgear

author: chuckrider
author_rank: Newbie
timestamp: February 01, 2020, 03:02:33 pm
content: HiRecently, I have DC load Itech IT8511A+. I have a problem with it - how to use OCP and OPP modes? The problem is that after configuring these functions andpressing the trigger, the device does not turn on the input. I see the message "RUN" on the display, after some time (probably due to the times in theconfiguration) it changes to "STOP", but the input is switched off all the time - the load is not active, also the "ON/OFF" button is not highlighted. In thismode the "ON/OFF" button cannot be activated manually. I tried a number of different configuration parameters, including those contained in the manual. Do Ihave to do anything extra here than written in the manual?All other modes work correctly, after configuring them and pressing the trigger they start working, the input is activated, the "ON/OFF" button highlights.The software version on my copy is 1.46.

author: Lena
author_rank: Newbie
timestamp: December 24, 2020, 09:03:20 am
content: Maybe it's a little late, but you can try emailing their tech support: fae@itech.sh