hybridfree/eevblog-posts huggingface dataset:
Will the Digitech QC-1929 (AKA Hantech 6022BE) work for my needs? - Page 1
Forum section: electronics / testgear

author: aberrant
author_rank: Newbie
timestamp: August 24, 2018, 05:48:01 am
content: I have a small pendulum driven DC generator project and I need to either record the output waveforms or log the raw data from the generator output (ideally both).The image below shows the kind of output I'm expecting based on the speed of the pendulum swing at steady state.Can this device measure both current and voltage simultaneously?Does it only display what's going on at a moment or can I read back previous measurements?I'm a new to using these kinds of instruments so please forgive my ignorance. I'm looking at this instrument specifically because it's not too expensive and available locally.ThanksEDIT: While the image only shows ~5seconds I would plan on logging the output over a period of 1 to 3 minutes during which time I expect there to be intermittent periods of zero output.Link to hardwarehttps://www.jaycar.com.au/20mhz-usb-oscilloscope/p/QC1929Link to manualhttps://www.jaycar.com.au/medias/sys_master/images/9126754844702/QC1929-manualMain.pdf
121GW included thermocouple maximum operating temperature? - Page 1
Forum section: electronics / testgear

author: rs20
author_rank: Super Contributor
timestamp: August 23, 2018, 01:23:13 am
content: I'm wondering what temperature I can safely operate the included thermocouple at? The 121GW manual states that it can measure up to 1350 degrees C, but I think that's talking about the range the multimeter is capable of understanding, not the temperature that the specific supplied thermocouple's insulating sleeve can withstand.Does anyone know what the model number and/or operating temperature range of the supplied thermocouple is?

author: Miti
author_rank: Super Contributor
timestamp: August 23, 2018, 01:48:09 am
content: Usually they are K type. Check for a K on the connector.Edit: Yes, K type, it says in the manual. And yes, K type can withstand 1350C.

author: DaJMasta
author_rank: Super Contributor
timestamp: August 23, 2018, 02:41:09 am
content: Maybe the thermocouple metal itself, but I doubt the insulator around it can stand up to that.

author: Seppy
author_rank: Unknown
timestamp: August 23, 2018, 04:30:20 am
content: Quote from: rs20 on August 23, 2018, 01:23:13 amI contacted Kane and they said it will measure up to 1350 degrees.

author: rs20
author_rank: Super Contributor
timestamp: August 23, 2018, 05:00:18 am
content: Wow, really? Are you sure they're not making the same mistake as Miti? What is the insulation made of, glass fibre?

author: radhaz
author_rank: Regular Contributor
timestamp: August 23, 2018, 05:28:06 am
content: https://en.wikipedia.org/wiki/Thermocouple#Table_of_insulation_materialsOrganic insulation won't even come close to surviving 1350 °C. Mineral Insulation.

author: rs20
author_rank: Super Contributor
timestamp: August 23, 2018, 07:51:35 am
content: Seppy, can you please go back to the manufacturer? I simply cannot believe the insulation on this thrown-in-the-box thermocouple has a higher thermal tolerance than even the most exotic materials listed here:https://en.wikipedia.org/wiki/Thermocouple#Table_of_insulation_materials

author: Seppy
author_rank: Unknown
timestamp: August 24, 2018, 12:31:24 am
content: Quote from: rs20 on August 23, 2018, 07:51:35 amDone, we will see... I agree, I don't know how that is a thing, I've asked what the insulation is.
Hameg Oscilloscope HM1004-3 Timebase problem - Page 1
Forum section: electronics / testgear

author: AwaisN
author_rank: Newbie
timestamp: August 23, 2018, 06:51:07 pm
content: Hi,I have Hameg Oscilloscope HM1004-3 which was working fine. Now it is giving timebase problem. Timebase horizontal line is not appearing in measurement mode but horizontal line is clearly visible in Component Tester mode. Few weeks back I opened and clean it, at that time timebase line was restored but now the fault appeared again. Information texts are ok on the screen.I need help to troubleshoot this fault and specific service manual of this model. I found service manual of HM1004 from the below link but PSU board is little bit different from the manual.https://www.scribd.com/document/381437371/Hameg-1004-1004-3-Oscilloscope-Calibration-Manual-Board-layoutThanks and regards,AwaisPS: The photo was taken before cleaning.
A6907 Tektronix  - Page 1
Forum section: electronics / testgear

author: rsalvo@comcast.net
author_rank: Newbie
timestamp: August 23, 2018, 12:14:39 pm
content: I have a Tektronix A6907I have 25 volts output on j1201 pin 1 and 2 from A30 power supply.Anyone know where a replacement A30 board would be found?Tektronix has none and not much info from the tech on this issue.Any help would be appreciated.

author: JS
author_rank: Frequent Contributor
timestamp: August 23, 2018, 05:13:18 pm
content: Let me google it for you...https://www.tek.com/a6907-manual/a6907-a6909-service-manualJS
tek 453 x or y issues? - Page 1
Forum section: electronics / testgear

author: m3vuv
author_rank: Super Contributor
timestamp: August 22, 2018, 09:31:40 pm
content: hi all,ive a tek 453,im trying to use an octopuss with it,when i first put it in xy mode it displays a dot as it should do,then shorting the octopuss probes together i get a verticle line as expected then after a second or 2 it reverts back to just a dot on the display,when i tap the scope i can get the trace back to normal for another couple of seconds,would the problem be with the x or y circuit?,it only plays up in xy mode and fine otherwise,i dare say its a socketed transistor dirty but not sure where to start looking,cheers m3vuv 73
UNI-T UT202 clamp meter not measuring correct AC voltages and current - Page 1
Forum section: electronics / testgear

author: AwaisN
author_rank: Newbie
timestamp: August 23, 2018, 06:10:24 pm
content: Hi,I have UNI-T UT202 AC clamp meter. Few days back when I tried to measure AC voltages and current, it gave wrong readings as compared to Fluke clamp meter. I need calibration procedure for this UT202 and will appreciate if get schematic also. Temperature readings also need to be calibrated. DC voltages and resistance measurements seems ok.Thanks and regards,Awais

author: HKJ
author_rank: Super Contributor
timestamp: August 23, 2018, 06:29:26 pm
content: Are you sure you are using the meter correctly?There are some issues with thermocouplers and multimeters:https://lygte-info.dk/info/DMMThermocouplers%20UK.htmlThe clamp do not measure true rms, could that be the problem?

author: AwaisN
author_rank: Newbie
timestamp: August 23, 2018, 06:57:45 pm
content: Yes. Before it was giving correct readings.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 23, 2018, 07:30:20 pm
content: How far off are the readings? Provide examples please.

author: AwaisN
author_rank: Newbie
timestamp: August 24, 2018, 07:36:55 am
content: Here are some measurement results for 50 Hz line voltages and AC Induction Motor Current.From Fluke 322 Clamp Meter: 226.7 Vac, 116.5 Vac and 3.25 AmperesFrom UNI-T UT202: Fluctuate b/w Overflow and random reading against 226.7 V from Fluke,106.7 Vac against 116.5 Vac from Fluke1.889 A against 3.25 A from Fluke
Low Z Mode power dissipation? - Page 1
Forum section: electronics / testgear

author: Phoenix6478
author_rank: Contributor
timestamp: August 21, 2018, 12:42:05 pm
content: HelloI have got a question regarding the low impedance mode on multimeters like the Fluke 289:The manual of the Fluke 289 states that it has an input impedance of 3kohm in the low z mode and it can go up to a 1000V. But if i measure for example 1000V, there will be a current flow of 333mA through the meter at 3k according to ohms law. But 0.333A at 1000V leads to a power dissipation of 333W. That is quite a lot of power to dissipate inside a multimeter.So how exactly does the multimeter handle the current flow? Is there a detection feature which switches to the usual 10Mohm impedance if the voltage does not drop down like in the case of ghost voltages?Greetings,Phoenix

author: exe
author_rank: Unknown
timestamp: August 21, 2018, 01:16:17 pm
content: I think they use PTC, 3kOhm only in cold state. At least 121GW works this way.

author: Phoenix6478
author_rank: Contributor
timestamp: August 21, 2018, 01:26:19 pm
content: Thank you for your replyUsing a PTC makes a lot of sense. As soon as the current starts to flow it starts to heat up and its resistance increses. The current gets limited by the rising resistance.

author: pigrew
author_rank: Frequent Contributor
timestamp: August 21, 2018, 01:37:53 pm
content: Joe Smith on YouTube just posteda video on the 189 which had a few minutes talking about the front-end of that meter. I assume the 289 had a similar setup.

author: David Hess
author_rank: Super Contributor
timestamp: August 21, 2018, 07:29:53 pm
content: It might also use a high voltage constant current shunt like a couple of depletion mode MOSFETs so the resistance increases proportionally to voltage.

author: mqsaharan
author_rank: Regular Contributor
timestamp: August 21, 2018, 08:54:23 pm
content: Hi Phoenix6478,Please take a look at HKJ's review athttp://lygte-info.dk/review/DMMFluke%20289%20UK.html. He has covered the answer to your question very nicely in the form of a graph. He is also a member here on EEVblog.Regards,Qasim.
Help with Fluke 289 Repair - Page 1
Forum section: electronics / testgear

author: ender4171
author_rank: Contributor
timestamp: July 27, 2018, 02:20:36 pm
content: Hey All,I have a Fluke 289 that has the detached IR diode issue. I am wondering if anyone here who has torn one down can tell me how to remove the LCD ribbon cable. The connector on the board is a white plastic piece with the ribbon going into it, but it does not appear to be a ZIF connector of any sort. At least there is no obvious tab to unlock. It looks like it MIGHT just press fit on (or the ribbon might just get pushed into it) but I am hesitant to pull on it with any force as I do not want to damage it if that is not the case.I can do the repair without removing the LCD, but it would be much easier to work on just the board itself.Any advice (particularly a video link to a 289 or similar teardown that shows this connector being removed) is much appreciated!

author: coromonadalix
author_rank: Super Contributor
timestamp: July 27, 2018, 08:33:03 pm
content: hum does this one need to be pushed down in direction of pcbi don't see the side of it in the teardown pictures ... it seems so has you gessed

author: Scottjd
author_rank: Frequent Contributor
timestamp: August 21, 2018, 02:58:24 am
content: I know the 289 has gone through a few hardware revisions. In this post I list a link to a public photobucket of mine. It has some good close teardown of the fluke 289.https://www.eevblog.com/forum/testgear/my-first-fluke-the-fluke-289-purchase-decision-and-tear-down-photos/msg757345/#msg757345Hope this helps,ScottQuote from: ender4171 on July 27, 2018, 02:20:36 pm
Rigol 1054Z with DHCP ? - Page 1
Forum section: electronics / testgear

author: JohnPi
author_rank: Regular Contributor
timestamp: August 19, 2018, 06:36:49 pm
content: My router assigns a DHCP address automatically. I can't get my 1054Z to take one when it boots -- it chooses a 169... one; each time I boot I have to do Utility..IO Setting..LAN Conf..Configure; choose DHCP and Apply.I can't seem to get the DCHP selection to 'stick' -- is there a trick to this ?Firmware = 00.04.04.SP3

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 19, 2018, 06:47:47 pm
content: Can't you just assign a fixed ip?

author: Ranayna
author_rank: Super Contributor
timestamp: August 19, 2018, 07:48:08 pm
content: A 169.254.x.x IP adress is chosen by a device that is configured to pull an adress from DHCP in the case that the DHCP server is not responding. It is used as a fallback, or for really simple networks when no DHCP server is available.Is there any kind of firewall in your network? Or maybe a MAC filter?Assuming you have standard home network, have you already tried connecting the scope directly to your router?In any case, in my opinion, if you will be using the scope regularly, you should assing a fixed IP. Nothing is more annoying to have to look up the new IP should the DHCP lease expire

author: JohnPi
author_rank: Regular Contributor
timestamp: August 19, 2018, 11:32:38 pm
content: My router assigns IPs to all other devices in my network without problems.The reason to not fix the IP (on the scope) is that if I take it to another location, then the fixed IP won't be appropriate. My router assigned IPs based of MAC address -- so it would get a pre-determined IP address at that site, but at another site, DHCP would work normally -- except I seem to have to do the configuration.Router = ASUS RT-AC68U, RMerlin firmware. No issues with any other gear

author: JS
author_rank: Frequent Contributor
timestamp: August 20, 2018, 05:00:33 am
content: I had the same problem with mine, but I use DHCP up to 192.168.0.100 on my networks, for the home PC 101, for the scope it was 102, my own PC 103. I don't see myself using the scope on a different network too often, but the config would work on my usual places as I use the same config, unless something else has 102 in which case I just need to tweak that last number. In many other networks will also work, as DHCP rarely hit 102 and 192.168.0.x/24 is the most usual network with the default gateway as 1.JS
Stickers on HP8568B and 8566B - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: August 18, 2018, 04:48:56 pm
content: I have both HP8568B and HP8566B. On both of respective DISPLAY section, at bottom side of CRT bezel, there is this sticker, "Downloadable Program (DLP) installed. To demo DLP, press blue SHIFT key and enter 10Hz".When followed, this does absolutely nothing other than displaying "Undef Key 10".I think this was done at factory, not by user, since the stickers are exactly at the same location in exactly the same manner.Does anyone know what this is about?

author: ps
author_rank: Regular Contributor
timestamp: August 19, 2018, 09:33:47 am
content: When the unit was shipped, there was some software code (DLP) preloaded into memory. Tolerance curves for CATV, test procedures for GSM, statistic/math functions, whatever. Now it seems to be gone. Someone erased the RAM to factory defaults, the NVRAM battery was empty, or something on the controller PCB has been repaired.
who know this USB meter on EEVblog video  - Page 1
Forum section: electronics / testgear

author: gourstath
author_rank: Newbie
timestamp: August 18, 2018, 07:56:51 am
content: in this videoI saw a USB meter , it was soulds great , who know this?

author: llkiwi2006
author_rank: Regular Contributor
timestamp: August 18, 2018, 07:59:57 am
content: Looks like this one from rd-tech:https://www.aliexpress.com/store/product/RD-UM25-UM25C-for-APP-USB-2-0-Type-C-LCD-Voltmeter-ammeter-voltage-current-meter/923042_32855845265.html

author: gourstath
author_rank: Newbie
timestamp: August 18, 2018, 08:09:51 am
content: thank you , I will check this

author: gourstath
author_rank: Newbie
timestamp: August 18, 2018, 08:12:10 am
content: yes, it is RD UM25 UM25C usb testit seems have many function ...why there is not any introduction on EEV blog video ...

author: Brumby
author_rank: Unknown
timestamp: August 19, 2018, 03:22:59 am
content: Quote from: gourstath on August 18, 2018, 08:12:10 amThere are a lot of electronics products and subjects that haven't had videos done on them here. This is just one of them.Will Dave do a video on what's available for this type of product? Who knows. Maybe if people send him different ones via mailbag, he might take it up. No guarantees, though.I do like the App and PC support

author: Mr. Scram
author_rank: Super Contributor
timestamp: August 19, 2018, 03:44:26 am
content: Sideloading an app that's downloaded from Mediafire and is made by an already sketchy looking supplier. What could possibly go wrong?

author: Muttley Snickers
author_rank: Unknown
timestamp: August 19, 2018, 04:04:06 am
content: Quote from: Brumby on August 19, 2018, 03:22:59 amThere was a member of the forum whom I believe was somehow involved with this and similar products but they were recently banned for basically spamming the forum with promotional material and possibly running a shill account or two as well.This was a bit silly and unnecessary on their part really as good products such as these need little if any promotion, I still don't understand why they would cut their own throat in this manner as they were an established member here, a forum search for RD Tech tells the story for those interested.

author: Terry01
author_rank: Frequent Contributor
timestamp: August 19, 2018, 04:04:37 am
content: I have this meter. It's a handy wee gadget. Like someone else posted though there are quite a few of them on the market now. This one doesn't have the iPhone App which I didn't know when I bought it, only android. I should have read the advert properly! It's handy for anyone who uses USB stuff. There are a few YouTube videos on this particular one that are worth a look before you buy one.
New BM235, Rigol DP712, Rigol DS1054Z, Agilent U1731B, Peak DCA55 - Page 1
Forum section: electronics / testgear

author: ExodusEffects
author_rank: Contributor
timestamp: August 18, 2018, 10:26:11 pm
content: https://www.dropbox.com/s/umaxjtpqa6gri75/Photo%202018-08-10%2C%202%2026%2016%20PM.jpg?dl=0

author: Terry01
author_rank: Frequent Contributor
timestamp: August 18, 2018, 10:40:56 pm
content: Nice lot my friend!

author: ExodusEffects
author_rank: Contributor
timestamp: August 18, 2018, 10:45:44 pm
content: Thank you very much. Can you tell what forum I did my research on

author: bitseeker
author_rank: Super Contributor
timestamp: August 19, 2018, 02:04:34 am
content: Nice bench!Note: Attaching the photo to your post will enable it to live as long as your post does, whereas linking to an external source increases the odds that it will disappear and leave your post orphaned of context.

author: xrunner
author_rank: Super Contributor
timestamp: August 19, 2018, 02:09:49 am
content: Suh-weet!
New BK Precision 3011B - Page 1
Forum section: electronics / testgear

author: ExodusEffects
author_rank: Contributor
timestamp: August 18, 2018, 10:28:30 pm
content: https://www.dropbox.com/s/rsburkl5cmuoy48/Photo%202018-08-18%2C%206%2001%2039%20PM.jpg?dl=0
Cheap "P6100" Teardown - Page 1
Forum section: electronics / testgear

author: Detzi
author_rank: Regular Contributor
timestamp: August 18, 2018, 10:01:34 am
content: Hi there,so it happened that i wanted to teardown one of these Cheap P6100 clones off eBay. They are actually very easy to disassemble, much easier than i thought.The two gray "rubber" things on the handpiece can be loosened by a bit of torsion, breaking the glue and then pulling them off. On the bigger one with the cutout for the switch and the strain relief, one sould loosen the strain relief first though, otherwise you will rip the coax off the pcb (as i did). The "PCB-Rod" is a slight press fit and can also be pulled out with some care not to deform the rod. The upper part is just plugged together, a slight bend on the rubber thing lets it snap out and the rest falls apart. Haven't found a teardown here so i thought i share it.

author: Hydron
author_rank: Super Contributor
timestamp: August 18, 2018, 05:42:48 pm
content: Thanks for the teardown - I'm unfortunately stuck with a couple of these steaming piles of garbage myself. Not even real resistive co-ax, so they ring really badly.I had bought them in the hope that they'd be useful throw-in-the-tool-bag probes that I wouldn't care about if they broke, but they're not even good enough for that. I may have a play turning one into a Z0-style probe with a 450R tip resistor and 50R termination, but it's probably a bit of a waste of time. I'll post here again if I have any luck.
Spectrum analyzer VBW filter question. (need to add filter to saved data) - Page 1
Forum section: electronics / testgear

author: DG41WV
author_rank: Regular Contributor
timestamp: August 18, 2018, 02:46:08 pm
content: Hi, I'm currently having a problem with finding the power of some frequencies that I captured through a spectrum analyzer (anritsu MS2036C). In the spectrum analyzer I have set the RBW to 300Hz and VBW to 1kHz. when I'm viewing the saved data through the analyzer the distance between 2 frequencies are 1kHz, but when I import the saved data to the PC the spacing is 300Hz. How do I convert it to 1kHz spacing? I don't know much about signal processing and any help would be appreciated.
FLUKE 185 manufacturing issue: broken case and glass - Page 1
Forum section: electronics / testgear

author: cluca1969
author_rank: Contributor
timestamp: July 26, 2018, 09:06:16 am
content: I have a Fluke 185 over 3 years and I'm very happy with this because is a good meter for my needs.I buy another Fluke 185 for a good friend and this have a major problem with his Fluke, after a period of about 3 years the casing and the protective glass have cracked. I find another Fluke 185 on a auction site with the same problems, the crack being in the same place. Photo 1 is my friend Fluke and Photo 2 is Fluke from auction site.The same friend has the same problem with another Fluke 83V, the crack is in another place, but it's the same with the casing and the cracked glass - Photo 3.If you have encountered such problems, please tell me your opinion because I think it is becoming a major problem for the FLUKE manufacturer.

author: cluca1969
author_rank: Contributor
timestamp: August 01, 2018, 09:04:36 pm
content: After a few days I met another surprise on Fluke 83 V, a new crack at the top of the screen.I see that this problem persists, and I talked to my friends who have been using the Fluke brand for many years and I drew a partial conclusion: it is possible perhaps the fault is also the age of the device and the precarious or premature aging of the plastic from which it is made, maybe also the contractions due to climate change, ie the transition from hot to cold can.And now what do you think?

author: Hydron
author_rank: Super Contributor
timestamp: August 01, 2018, 09:49:59 pm
content: Certainly not an issue with my (over 10 year old) 87V and it had a lot of abuse from the sparky who owned it before me, including a number of scratches in the screen. Maybe an issue with the raw material given it's on a few different models?

author: lowimpedance
author_rank: Super Contributor
timestamp: August 01, 2018, 11:26:05 pm
content: Is it possible to take the cover off to take internal photos of that area and post here ?, to see if there is some stress being applied to that area by the PCB or a screw mount etc.

author: cluca1969
author_rank: Contributor
timestamp: August 01, 2018, 11:36:20 pm
content: I will try to take some photos with the of internal casings, and I will posted here, but from my memories, I repair a Fluke 185 and I don't remember if I did not encounter problems with reassembling him.

author: cluca1969
author_rank: Contributor
timestamp: August 18, 2018, 12:08:42 pm
content: Another pictures from inside of Fluke 185. Very surprising how the crack started from the outside of the case, then continued to the left-hand corner, climbing up the screen protective plexiglass. What I noticed is that inside the housing there are no screws or clamps that could have created pressure that extends to the outside of the housing. I think this happening is very mysterious.
Interchangeability of Tektronix passive probe tips - Page 1
Forum section: electronics / testgear

author: RAndres
author_rank: Newbie
timestamp: August 17, 2018, 05:34:25 pm
content: I bought a few used P6106 probes without tips from eBay, and am trying to find out which tips work with them. I tried to search, but couldn't come up a good filter for this exact issue. There are part numbers for hook tips in the data sheet, and for other probes. I think the hook tips are fairly generic, but am not sure enough to buy some without knowing. Anybody know one to avoid, or ones that work? For that matter, can you recommend a place to get sets of adapters? I'm mostly going to need the hooks, minigrabbers, and whatever else is good for PCB work at low voltage.

author: vk6zgo
author_rank: Super Contributor
timestamp: August 20, 2018, 01:53:35 am
content: If they are the same ( small) general type, they all seem to fit.In fact, the "El Cheapo" ones will fit Tektronix & vice versa, although the "vice versa" is usually a more secure fit.

author: macboy
author_rank: Super Contributor
timestamp: August 20, 2018, 03:09:43 pm
content: Tek has three sizes of probes, with generally interchangeable accessories with others of the same size:https://sg.tek.com/accessories/more-accessoriesI've used the 5 mm hook clips on the 3.5 mm probes, but it might put extra strain on the tip.

author: RAndres
author_rank: Newbie
timestamp: August 21, 2018, 05:02:02 pm
content: Good info, thanks! The link is very helpful, it answered some other questions as well.
F87 error Fluke 87-v? - Page 1
Forum section: electronics / testgear

author: Elk-ECE56
author_rank: Contributor
timestamp: August 17, 2018, 09:01:48 pm
content: Hi there guys! Just made an account for this forum, been a lurker/watcher of the EEV blog. BUT I have a Fluke 87-V and I left it running while I was doing a min-max using that feature. I took it off the ranging feature and left it at my bench turns out it was on, but it turned off after 30 Minutes like it's supposed too. However now, every time I flip the dial on I see F87 and the high voltage warning on the side you usually get when measuring above 30V. Is this to change the battery? I've contacted fluke but I was hoping for some insight from you guys. Thank you!

author: retiredcaps
author_rank: Super Contributor
timestamp: August 17, 2018, 09:23:53 pm
content: Quote from: Elk-ECE56 on August 17, 2018, 09:01:48 pmThat is the easiest to try. Try a completely fresh 9V battery.I know the first generation Fluke 87 has problems booting if the 9V battery is weak.

author: Elk-ECE56
author_rank: Contributor
timestamp: August 17, 2018, 09:26:00 pm
content: I see thank you! Should I be worried warranty wise or do Fluke not care if you change it yourself?

author: retiredcaps
author_rank: Super Contributor
timestamp: August 17, 2018, 09:30:58 pm
content: Changing the battery will NOT void your warranty. Same goes for changing the fuses.

author: Elk-ECE56
author_rank: Contributor
timestamp: August 17, 2018, 09:36:16 pm
content: Found this:https://www.eevblog.com/forum/repair/fluke-87v-adversely-affected-by-cool-temperatures/Turns out, at least from what I've read the f87 is a normal startup message and my meter must have been in some mode OR I've been doing it all wrong haha.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 17, 2018, 09:53:37 pm
content: Wait a minute?I'm confused. Are you saying the 87V gets stuck at the F87 screen? Or are you asking if it shows the F87 during bootup as normal?I thought you were saying your 87V is stuck at the F87 during boot.

author: Specmaster
author_rank: Super Contributor
timestamp: August 17, 2018, 09:57:13 pm
content: Quote from: retiredcaps on August 17, 2018, 09:53:37 pmSurely the owners manual should mention this if its a standard message?

author: Elk-ECE56
author_rank: Contributor
timestamp: August 17, 2018, 09:58:33 pm
content: That was my thinking, I consulted the manual but it's not listed there so I did some more digging and someone on another forum said it could be an error for magnetic damage yet I haven't put my meter near any magnets except the magnet hang kit that came with it from fluke

author: Specmaster
author_rank: Super Contributor
timestamp: August 17, 2018, 10:11:40 pm
content: Quote from: Elk-ECE56 on August 17, 2018, 09:58:33 pmWell in that case you should try a brand new battery and see if it still happens.

author: Elk-ECE56
author_rank: Contributor
timestamp: August 17, 2018, 10:13:03 pm
content: Agreed, thanks for the insight! It all helps
Output cable for HP 653A - Page 1
Forum section: electronics / testgear

author: rodrigo.gesswein
author_rank: Newbie
timestamp: August 17, 2018, 08:03:47 pm
content: Hello,I got for free an Hp Test Oscillator Model 653A but need output cable, please can help me to find the right cable to buy ?ThanksRodrigo

author: tautech
author_rank: Super Contributor
timestamp: August 17, 2018, 09:33:43 pm
content: From this page:http://www.geocities.ws/mnowlen/descr.htmHas selectable 75 ohm unbalanced or 124 ohm balanced output using very cool Western Electric 358A and 408A output jacks.Never seen them before.
Recomend me a digital microscope with USB - Page 1
Forum section: electronics / testgear

author: lordvader88
author_rank: Frequent Contributor
timestamp: August 15, 2018, 10:30:08 pm
content: I don't want a super cheap or super expensive 1, maybe $200 ? I don't really know anything about them or whats needed for electronics. But I have some cash and I want 1.

author: DaJMasta
author_rank: Super Contributor
timestamp: August 15, 2018, 11:25:36 pm
content: It's on the lower side for a decent microscope (at least, that's above the cheapy ones), but if you don't want to go with the low tier, maybe the Aven Mightyscope 5M?There are some reasonable ones on the real cheap end, but you'll run into limitations with illumination/optics/software/etc. When I was looking around my budget was a bit more, but I ended up deciding I didn't want a USB scope, cause generally the framerate at good resolution is not all that high and not suitable for soldering under, though it works for inspection. If you consider used, there are some DinoLite scopes with VGA output in this ballpark, and that would be a notable improvement in optics, build quality, and framerate over most of the <$200 options, though the brand typically runs pricey for new scopes.

author: lordvader88
author_rank: Frequent Contributor
timestamp: August 16, 2018, 01:11:15 am
content: I should say I don't 1 with eyepieces for me to look throughI would like high enough resolution to examine/ clearly save and map out SMD PCBs, that will be the main use for nowAnd I should be-able to SMD solder under it, I'm not repairing motherboards yet but I don't want to buy 1 now and then need another 1 later.I'd say there's $20-50 scopes that would do fine for most stuff I'm doing now, and I won't be using it that often. But I can justify more money

author: billfernandez
author_rank: Regular Contributor
timestamp: August 16, 2018, 05:02:55 am
content: I have (and like) the Adonstar HDMI Microscope. It's in your price range. Here's a thread about it:https://www.eevblog.com/forum/manufacture/the-andonstar-hdmi-microscope-thread/

author: Candid
author_rank: Regular Contributor
timestamp: August 16, 2018, 06:32:55 am
content: The video from KainkaLabs may be helpful for you:https://youtu.be/6-erG5yUDmw

author: lordvader88
author_rank: Frequent Contributor
timestamp: August 17, 2018, 06:06:49 am
content: wow I just started the video and 1 of those head gear things would be nice

author: Candid
author_rank: Regular Contributor
timestamp: August 17, 2018, 08:28:25 am
content: For a USB microscope you may have a look on:https://www.eevblog.com/forum/manufacture/the-andonstar-hdmi-microscope-thread/
New Rigol power supply (DP711)  - Page 1
Forum section: electronics / testgear

author: MarkF
author_rank: Super Contributor
timestamp: November 12, 2016, 06:33:27 pm
content: I was wondering if anyone has the newDP711 Single Channel Power Supplyand what their thoughts are. Maybe Dave will do a teardown and review.

author: carlob
author_rank: Contributor
timestamp: November 15, 2016, 10:07:19 pm
content: I second that & bump post for you.I would also really like to see that review...Thanks Dave!

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: July 30, 2018, 03:43:02 am
content: it has rs232 wondering if possible to modify to obtain fine resolution & perhaps other locked features. I can use the fine resolution.

author: MarkF
author_rank: Super Contributor
timestamp: July 30, 2018, 04:35:34 am
content: Another supply that looks promising is theSiglent SPD1168Xwith USB and LAN capabilities.

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2018, 08:29:13 am
content: Quote from: MarkF on July 30, 2018, 04:35:34 amAnd remote Sense.There's a thread on them in the TE board.Keep an eye on Defpom's YT channel as he's got one of mine for a look at and maybe a teardown too.

author: threephase
author_rank: Regular Contributor
timestamp: July 30, 2018, 07:23:48 pm
content: I opted for the DP712 a while back. Can't really grumble at it, after all it is just a power supply.I only ever use it as standalone, have never used the software with it.Is there anything you want to know in particular?Kind regards

author: riccardo.pittini
author_rank: Regular Contributor
timestamp: July 31, 2018, 10:59:14 am
content: ...Serial port no ethernet.... WHY??Nowadays a ethernet controller has a cost of cents...

author: Wolfgang
author_rank: Super Contributor
timestamp: August 16, 2018, 03:58:39 pm
content: ... No USB is a bit silly nowadays. Who still uses RS232 ?
Leader LPS-152 square hole Grommet - Where to find? - Page 1
Forum section: electronics / testgear

author: zitt
author_rank: Regular Contributor
timestamp: August 16, 2018, 02:15:17 am
content: All,I have a Leader LPS-152 linear power supply that I successfully resurrected from someone else's repair job. Now that's completely repaired; I wanted to do the last bit of mechanical repair. Basically; the square hole grommet around the power button has cracked and failed... which leads to an unfinished look.I've recreated the grommet in 3D CAD and uploaded it to Shapeways for printing... but before I do; I wanted to find out if anyone knows of a source for the original grommet?https://www.shapeways.com/product/GY2FALG6K/leader-lps-152-hole-grommetI haven't seen these for quiet some time... but then again; I don't really know exactly what this finishing part is called so unsure what to search for on google.Any ideas?
Fluke 8020A LCD display (revisited) - Page 1
Forum section: electronics / testgear

author: GregDunn
author_rank: Frequent Contributor
timestamp: August 15, 2018, 04:00:23 pm
content: While cleaning up my bench I realized that I still had this DMM in its carrying case. I set it aside years ago because of the typical display failure mode where the whole thing goes dark and unreadable. Of course several enterprising people have found a way to substitute a new model LCD for the old Fluke part.Here's my question. The descriptions - including Modemhead's excellent blog - point to the LUMEX LCD-S3X1C50TR-A or -B. These seem to be out of stock in places like Digi-Key or Mouser (I haven't tried every possible supplier yet). However, the apparently compatible Varitronix VI-302 is readily found. A check of the pinouts and physical size indicates it should be a compatible device, except that the LUMEX says "3-5V" and the Varitronix "3V".Does anyone know of a current source for the LUMEX which is in stock? Or is the Varitronix actually voltage compatible with the existing Fluke display? Suggestions welcomed.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 15, 2018, 04:28:16 pm
content: Quote from: GregDunn on August 15, 2018, 04:00:23 pmI might be reading Mouser's site not correctly, but it shows 2250 in stock?https://www.mouser.com/Search/Refine.aspx?Keyword=LCD-S3X1C50TR-A

author: GregDunn
author_rank: Frequent Contributor
timestamp: August 15, 2018, 04:35:43 pm
content: OK, that's weird - I looked at that same entry last night and it showed none in stock. Maybe something cached in my browser. At any rate, crisis averted!

author: retiredcaps
author_rank: Super Contributor
timestamp: August 15, 2018, 05:10:54 pm
content: I see you bought 2? 2248 left in stock now.

author: GregDunn
author_rank: Frequent Contributor
timestamp: August 15, 2018, 05:48:25 pm
content: Yes - in case I stuff up the first one trying to install it.Also, it's hardly worth buying just one and paying the same or more just to have it shipped...
Lucent RFTG KS-24019 L104C connection with Lady Heather - Page 1
Forum section: electronics / testgear

author: aero_eng
author_rank: Newbie
timestamp: August 15, 2018, 05:23:27 pm
content: This is my fist post and I really hope that anyone can help me with the problem I encountered.When I completed my final aerospace engineering exams this summer I noticed that I would like to combine my newly gained degree with my previous profession as a watch and clock maker. So I purchased a Lucent RFTG that has the Rubidium (L102B) and Quartz (L104C) built in one frame. I was lucky enough to compare its performance with a bank of calibrated Caesium clocks and was baffled by its performance despite its age.I have built an Arduino driver for an analog clock and soon I will also incorporate a digital version driven of the rubidium standard using the PicDIV micro controller. I like to have my own atomic timeAnyhow, here are my questions:It has a 15Dsub connector for the RS422 data traffic. The manual talks about an adaptor that has a y-configuration 1x15D-sub to 2x 9D-sub. Has anyone have a wiring diagram for this connector adaptor? or is there another way to connect this with a computer?I have measured the output signals of the connector any i narrowed down the signals and the pins. however when I connect it up Lady Heather is only able to pick up the manufacturer of the GPS module which is Motorola. Does Lady Heather offer the option to connect up to this GPS module? I find it weird that it recognises the module manufacturer and yet is unable to receive any other data.Any help is very much appreciated.
PROTEK P3850 / HUNG CHANG 3850 user manual - Page 1
Forum section: electronics / testgear

author: faraday
author_rank: Regular Contributor
timestamp: August 21, 2014, 06:41:34 am
content: Hello, I'm new to this forum and I'm looking for user manual for PROTEK P3850 / HUNG CHANG 3850 portable oscilloscope and logic analyser.

author: eitau
author_rank: Newbie
timestamp: August 15, 2018, 02:27:41 pm
content: Hi. Do you need this user manual yet?
Siglent SPD3303X LCD Screen Query - Page 1
Forum section: electronics / testgear

author: BocaDev
author_rank: Contributor
timestamp: August 14, 2018, 12:30:35 pm
content: Hello,A few months ago I purchased the SPD3303X power supply for my workbench. I now need to perform some long-term PCB testing, keeping the supply on 24/7 for months.Should I have any concerns about keeping that big LCD on over the longevity testing? I don't see any way off turning off the LCD or dimming it. Would be nice to turn it off, pushing a button or something.Thank you...

author: tautech
author_rank: Super Contributor
timestamp: August 14, 2018, 07:57:13 pm
content: In early firmware versions Siglent had a screensaver feature and it was widely criticized as not being necessary for a TFT display so it was removed.There's mention of it in the SDP3303X thread if you want to hunt it out and read the reasoning why it's not deemed necessary for TFT displays.

author: DaJMasta
author_rank: Super Contributor
timestamp: August 14, 2018, 08:03:26 pm
content: Though tautech basically said it, the answer is no. Modern TFT LCDs don't suffer from the same kind of burn in that plasma screens or OLED screens, so the only issue with leaving it on long term is the normal concerns with powered up electronics (so very little) and then maybe backlight aging? If it's a CCFL maybe that's something, but if it's LED backlit, then you're going to be looking at electrolytic caps drying out as being probably more of a concern than anything screen related in terms of high-uptime longevity.

author: tautech
author_rank: Super Contributor
timestamp: August 15, 2018, 01:11:10 am
content: Quote from: BocaDev on August 14, 2018, 12:30:35 pmSome more info for you.The last FW version before the screensaver was dropped was Version P02.02R2 and available on the Shenzhen website:http://www.siglent.com/ENs/gjjrj-xq.aspx?id=1409&tid=15However earlier FW versions didn't have the same good GUI that we have today and some of the displayed values were missing. The screensaver was removed with this FW version:http://www.siglent.com/ENs/gjjrj-xq.aspx?id=1790&tid=15Note: to download FW from the Shenzhen site you must register while downloads can be anonymous from US and EU sites but not all old FW versions are available.
AM Modulator - Page 1
Forum section: electronics / testgear

author: Charlie86
author_rank: Regular Contributor
timestamp: August 14, 2018, 06:06:16 pm
content: Hi,I got this AM Modulator in dumpster dive. For what kind of use is this device? Can it be used for something in hobby electronic?https://ibb.co/mBn9wUhttps://ibb.co/bMC9wUhttps://ibb.co/i1yGbU
Fluke 97 schematic - Page 1
Forum section: electronics / testgear

author: DDunfield
author_rank: Regular Contributor
timestamp: July 05, 2018, 01:46:13 pm
content: Hi Guys,Picked up an old Fluke 97. Unfortunately seller "forgot" to mention that several keys are non-functional. Looks like the keypad membrane is defective.Downloaded the service manual online, but it looks to be the wrong one for this meter. My meter has a flexible membrane containing the keypad contacts, which connects via a ribbon cable which has 16 embedded wires. The manual I downloaded does not show this foil, and the schematic shows all 39 keys connected to ground on one side, and with individual connections into shift registers - this would require at least 40 connections (plus the power key). So it would seem the schematic does not reflect my meter.It seems Fluke/Philips changed the design at some point.Does anyone have, or can point me at the correct manual/schematic for this meter? I've searched online, but all I can find is the same manual which is for the later revision.Thanks,DavePS: Has anyone tried/used the board that replaces the membrane which is available from "ScopemeterRepair.com"? Looks like it would be a good (if expensive) solution, but I wonder how well it fits as it has to be larger than the original membrane which is very thin...?

author: joeqsmith
author_rank: Super Contributor
timestamp: July 05, 2018, 06:53:24 pm
content: Dave,There is a member here, Scott, who offered a much nicer manual to me. I did not take him up on the offer and am not sure which version it is. If you do a search on this site for Fluke 97, you should find the thread.

author: DDunfield
author_rank: Regular Contributor
timestamp: August 13, 2018, 10:45:37 am
content: Just a quick follow up:Still haven't located the proper schematic/manual, but I am happy to report that I received the replacement keypad board mentioned in my original post and it fits and works perfectly.Dave

author: chronos42
author_rank: Regular Contributor
timestamp: August 13, 2018, 11:47:56 am
content: Hi,you have a newer version of the PM97, the digital board is different compared to the older Philips design. Search for a Fluke 105 manual in the net, the schematics are compatible with your instrument, only the firmware and the flash roms are different.The flexible membrane is a weak point in this instrument, it is a common defekt that traces will crack. i have repaired these defects with conductive glue.
LCD Flicker during start up on the Rigol DP712 power supply  - Page 1
Forum section: electronics / testgear

author: ExodusEffects
author_rank: Contributor
timestamp: August 13, 2018, 05:31:54 pm
content: So I’ve recently purchased an “ open box “ DP712 from Reputable local dealer which has some screen flicker and white lines during start up. I’ve read about similiar issues on other rigol products and they ended up being fixed during firmware updates.As it’s an open box I only have a warranty from the original time of purchase which was in 2017 ( not me but the original owner who obviously returned it within the 30 day window I would assume ) as I have 30 days in total to bring it back to them myself . What would you guys recommend doing as they don’t have any other open box ones I can swap it for. I’m assuming it’ll be a refund situation
HP 8663A help and suggestions - Page 1
Forum section: electronics / testgear

author: rcowboy78
author_rank: Contributor
timestamp: August 12, 2018, 12:34:05 am
content: So I picked up an HP 8663A for dirt cheap, and it serves me right because it's a basket case.Short summary:Power supply was toast. I have rebuilt all 4 power supply boards, and have got the machine up and running. Everything is running great up to its output so far. Currently I am chasing the following problem, and am stuck on what to do.The output of jack J4 on board A4A3 is not correct. J4 should = 120 - 640 Mhz at 0dB. My output is all over the place from being right, to no output at all. It's intermittent.Here's my problem: I have pretty much determined that the output amp for this section is fine, because J2 and J3 outputs are just fine and there outputs go through U5. J4 is the only one that's not correct. I would like to probe TP9 and TP2 and see if I get the proper signals there. However, to really probe these correctly I need either 500 MHz probes or better, or I need to run some coax out of this module and terminate it with SMA's, which then can go to a scope. In order to do this, I would have to drill a couple of holes through the mounting plates on the outside to get the coax through. I do not have the riser kit for this instrument, and frankly I haven't tried to source one.I've attached an image of the schematic and picture of the board for your enjoyment.I though maybe someone could give me another suggestion on how I could probes these points without making a mess. The image is the best I could do with the small available size of pictures on the site.Thanks for your help,rcowboy

author: rcowboy78
author_rank: Contributor
timestamp: August 12, 2018, 04:30:23 am
content: Upon further inspection, I was able to detach the face plate to get the RG-174 through without drilling holes. Will see how it goes. Will make some SMA pigtails and probe that way.rcowboy

author: rcowboy78
author_rank: Contributor
timestamp: August 12, 2018, 07:30:44 pm
content: Test Point 2, beautiful.Test point 9,Now to find the problem. This could take a while.rcowboy

author: rcowboy78
author_rank: Contributor
timestamp: August 13, 2018, 04:14:14 pm
content: Okay, moved the pig tails to TP5 and TP8. Bad signal at TP5 and bad signal at TP8. Therefore the problem lies somewhere in the divide by 2 sections or CR1 pin diode.I bet it's U3 or U4, and after a quick search I'm turning up empty for the part. It's some sort of NOR gate job with a flip flop. Could be a Capacitor problem, but unlikely since most of them are ceramic.Anyways, will keep digging and see what I can do.rcowboy
Analogic 6100 Universal Waveform Analyzer - Anyone have an OP or Service Manual  - Page 1
Forum section: electronics / testgear

author: slbender
author_rank: Regular Contributor
timestamp: August 12, 2018, 02:39:05 am
content: Analogic by Data Precision in 1988 the model 6100 cost $7995. plus $6495. for the model 630 which is a 12 bit, 2 channel A/D input module. That's a lotta dough for something with so many buttons, not at all sure what it can do, or how to operate it. I actually had two of these model 6100's but had to downsize, so I tossed the nonworking 6100 back in 2012. I did keep the possibly functional input module, which I think was a 16 bit / 4 channel A/D unit the model 650, - which cost $12,800. way back when. I can't recall where these "half a ton" monsters came from or how I got them into my living room, but the books would be ever so much appreciated, paper or .PDF form.Steven

author: precaud
author_rank: Frequent Contributor
timestamp: August 12, 2018, 01:20:18 pm
content: I have the op/programming manuals, but no service manuals were ever released for the 6100's.

author: slbender
author_rank: Regular Contributor
timestamp: August 12, 2018, 06:00:38 pm
content: Quote from: precaud on August 12, 2018, 01:20:18 pmHey that sounds good, is it a big paper book or a file?How can I get it to copy?Thanks,Steven

author: precaud
author_rank: Frequent Contributor
timestamp: August 13, 2018, 01:48:44 am
content: Quote from: slbender on August 12, 2018, 06:00:38 pmIt (they) is (are) 2 or 3 large 3-ring binders.QuoteYou could buy them...