hybridfree/eevblog-posts huggingface dataset:
Valuable Multimeter Tips - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: June 19, 2019, 10:57:48 am
content: Great advice!

author: 2N3055
author_rank: Super Contributor
timestamp: June 19, 2019, 11:18:08 am
content: LOL!

author: WinnieThePooh
author_rank: Newbie
timestamp: June 19, 2019, 05:53:13 pm
content: Black magic of multimeters

author: Fungus
author_rank: Super Contributor
timestamp: June 19, 2019, 06:03:48 pm
content: What button do I have to hold at power-on to enable these features?

author: luma
author_rank: Regular Contributor
timestamp: June 19, 2019, 06:34:18 pm
content: Well that depends if you have a metric mulTIMeter or an imperial MULTImeter...

author: Gregg
author_rank: Super Contributor
timestamp: June 19, 2019, 07:39:05 pm
content: Everyone knows that to weld aluminium you’d use a mulTIMeter and to weld aluminum use a MULTImeter.I’m surprised Tony didn’t make that distinction.But --- what a great April Fool’s video!

author: rhodges
author_rank: Frequent Contributor
timestamp: June 19, 2019, 11:01:55 pm
content: I actually have (or had) the pocket meter! It's somewhere... I think my 123 block has oil on it. Will that affect the accuracy of my readings? I appreciate the welding advice, but it would be nice if he had compared the shielding gas options when welding with the probes. Maybe a tri-mix could have prevented the gouges on his probe?

author: xrunner
author_rank: Super Contributor
timestamp: June 19, 2019, 11:17:52 pm
content: Electronics fake news?

author: rsjsouza
author_rank: Super Contributor
timestamp: June 20, 2019, 02:28:34 am
content: Man, what an awesome selection of multimeters - I am pretty sure the resident machinist Robrenz knew about all this but did not share such valuable information...My dad had the Radioshack portable, but I had no idea it could do all this.

author: David Hess
author_rank: Super Contributor
timestamp: June 20, 2019, 04:16:53 am
content: Ah, good old Tony. All of the videos on his channel are worth watching.
HP3586A, B, C Selective Level Meters--Battery corrosion of A80 Power Supply PCB - Page 1
Forum section: electronics / testgear

author: N2IXK
author_rank: Frequent Contributor
timestamp: June 19, 2019, 03:49:27 pm
content: TL/DR: Just completed the prototyping and testing of a replacement power supply (A80) PCB for these instruments, and am making them available to the community. See my post in Buy/Sell/Wanted to purchase one.Got hold of an HP 3586B selective level meter (frequency selective voltmeter) for a really cheap price because it was written off as beyond economic repair due to extensive damage to the power supply card due to the NiCd RAM backup battery leaking electrolyte all over the power supply regulator PCB. the electrolyte also damaged the edge card connector on the motherboard, but fortunately caused no damage to the motherboard itself. Apparently, the unit had previously been powered up before the corrosion damage was found, resulting in damage to the pass transistor (Q3) and OVP zener (CR20) on the +5V supply rail, which are mounted on a separate heatsink assembly. Replacing these, along with a front panel power switch damaged by someone installing a much too long screw to secure a rackmount bracket, and I now have a nicely working unit that passes all self tests. The A80 board itself suffered extensive damage, with many traces completely destroyed and component leads dissolved by the potassium hydroxide electrolyte. A complete board replacement was the best solution in my case, but people have repaired these in cases with less extensive damage. If you get one of these instruments, CHECK THE A80 BOARD FOR BATTERY LEAKAGE BEFORE POWER ON, and save potential damage to other components.These are essentially highly sensitive LF/HF radio receivers with variable IF bandwidth and very finely calibrated signal strength meters. Originally intended for use in measuring multifrequency trunking systems for analog telco use, they are also handy instruments for general RF testing purposes.
Tips&Trick wanted - probing the PCB with several scope probes, techniques?[img] - Page 1
Forum section: electronics / testgear

author: Warhawk
author_rank: Frequent Contributor
timestamp: June 18, 2019, 07:25:25 pm
content: Hello everyone,I occasionally need to probe faster signals (e.g. square <1MHz) on the PCB with scope probes. What do you do when the best solution is simply soldering the probe to the PCB?Now, I am dealing with a sandwich-like PCB assembly without any chance to reach desired signals with the probe. For this reason I took a short piece of RG174 and createdan adapter for the standard 1:10 probe.However, I know just little about high-speed and RF stuff. Would anybody be able to give an educated guess how much I ruined the bandwidth of the probe?

author: tggzzz
author_rank: Super Contributor
timestamp: June 18, 2019, 07:35:30 pm
content: You would benefit from understanding high impedance Z0 resistive divider probes. FFI seehttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/But note that the frequency is determined by the risetime, not the period.

author: Warhawk
author_rank: Frequent Contributor
timestamp: June 18, 2019, 09:10:43 pm
content: fantastic reading, thank youI'll invest some time in this.
HY1802D power supply - Page 1
Forum section: electronics / testgear

author: bob91343
author_rank: Super Contributor
timestamp: June 17, 2019, 08:17:24 pm
content: Does anyone have a diagram/parts list for this unit? I recently acquired one and was able to repair it but I don't know about the next time.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 17, 2019, 08:59:53 pm
content: should be similar to this one :https://elektrotanya.com/mastech_hy-1803d_single-output-dc-power-supply_sch.pdf/download.html

author: bob91343
author_rank: Super Contributor
timestamp: June 17, 2019, 09:32:41 pm
content: Yes it's similar but that one is the 3A model, and no parts list.Thank you for the link; I will hang on to it in case I can't find the specific model.
Tektronix .1uF gizmo, what is it? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: June 17, 2019, 06:30:02 pm
content: https://www.ebay.com/itm/352694168109?.1uF something-or-other. Never seen one before.Only thing I can think of is a 5 way DC block, which would be kind of cool.

author: Yansi
author_rank: Super Contributor
timestamp: June 17, 2019, 06:45:59 pm
content: Have you tried measuring it?

author: Jwalling
author_rank: Unknown
timestamp: June 17, 2019, 06:58:51 pm
content: Quote from: Yansi on June 17, 2019, 06:45:59 pmIt's not mine. I just happened to see it on Ebay.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 17, 2019, 07:19:25 pm
content: Looking at the way it is built (overlapping lock washers, lock washer missing on the middle connector, connectors covering the part number) I think someone has been creative at home.

author: Jwalling
author_rank: Unknown
timestamp: June 17, 2019, 08:48:48 pm
content: Quote from: PA0PBZ on June 17, 2019, 07:19:25 pmGood points, especially about covering up the part number. Can't imagine that Tek would do that!

author: thm_w
author_rank: Super Contributor
timestamp: June 17, 2019, 08:51:26 pm
content: Quote from: PA0PBZ on June 17, 2019, 07:19:25 pmYeah they took atek BNC attenuator(or similar), drilled a bunch of holes to put SMA plugs and then capped off the BNC ports. Seems like a waste, should have just used an empty project box, but maybe they had a lot of these on hand.Whats actually inside it? Who knows, but probably just involves a bunch of 0.1uF caps.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 17, 2019, 08:54:25 pm
content: A 1 to 5 ouput rf splitter with 0.1 uf coupling
FY3200 USB isolation - Page 1
Forum section: electronics / testgear

author: ledtester
author_rank: Super Contributor
timestamp: June 17, 2019, 05:32:33 pm
content: I performed my linear PSU upgrade a while ago, but it always bothered me that the USB port wasn't isolated. Realizing that the serial baud rate is fixed at 9600 baud by the firmware I decided to try to use optocouplers between the CH304G chip and the main board.This page has some data and oscilloscope traces of how various optocouplers perform at different baud rates:https://github.com/pepaslabs/Electronics/wiki/Designing-a-TTL-Serial-Opto-isolatorSo it seems that 9600 baud is no problem for pretty much any opto. I went with some L187D chips I salvaged from the RS232 section of a UPS power supply. That board also had some NEC 2561s on it.I used "Circuit B" from the above page which inverts the signal with a PNP transistor before the optocoupler (attachment 1), and here is how it performs at 9600 baud (attachment 2). Blue trace is the input signal, yellow is the output of the optocoupler. The rise times are obviously not that great, but it works. Maybe I'll try again using 4N25's and see if I can get better rise times.I tried this approach because it was simple and I didn't have to order any parts. Hopefully I'm not overlooking some obvious isolation issues. And if I wanted to do this "for real" any suggestions on what parts to use? The ADuM1201 for instance seems to be a popular solution.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 17, 2019, 07:40:13 pm
content: Why invert the input, instead of hanging the LED from VCC? Or using the phototransistor in "emitter follower" direction. The isolator's isolated, innit?4N25 is a bit slow, but not a problem at 9600. It can be improved somewhat, by using a higher CTR_sat (smaller load resistor), adding a B-E resistor (typically ~100k, which also reduces the CTR a bit), or using more elaborate methods that are amusing but not very practical (e.g., the phototransistor can be used as part of a transimpedance amplifier). After that, 6N137 or SFH6345, or most of the logic-output types (e.g. 6N138), are preferred (good up to 1Mbps+).The amount of noise tolerated by the isolator is important, too. 6N137 is terrible, enough that I wouldn't recommend it even for simple galvanic isolation (which presumably only needs to handle a few volts worth of ambient RF noise). SFH6345 is excellent (good enough to use for isolated gate drivers!). 4N25 is slow enough that it isn't really susceptible to much, so is also quite fine here.Tim

author: coromonadalix
author_rank: Super Contributor
timestamp: June 17, 2019, 08:48:58 pm
content: You have usb isolators on ebay up to 1500voltshttps://www.ebay.com/itm/1500V-USB-to-USB-Isolator-Board-Protection-Isolation-ADUM4160-ADUM3160-Module/201771509748?https://www.ebay.com/itm/1500V-USB-to-USB-Isolator-Board-Protection-Isolation-ADUM4160-ADUM3160-Module/152382773951?
Tektronix DPO4104B-L , any user ? - Page 1
Forum section: electronics / testgear

author: thememo
author_rank: Newbie
timestamp: June 06, 2019, 09:23:45 am
content: I need higher BW oscilloscope recently, but you know most of devices price is very high even the "entry" level brand Siglent oscilloscopes. Siglent SDS5104X 4Ch 1GHz 5GSa/s Oscilloscope' price is about 6.5 K €. My budget is about 4 k $. So I decided to buy used one. I found used Tektronix DPO4104B-L (1 Ghz BW) in my own region, price is very good 3.5 K $, but i didn't find any detailed user review. When i search on the forum , most of the issue about repair. if anyone use this device, can tell your ideas,thoughts? Thanks.

author: Mr Nutts
author_rank: Regular Contributor
timestamp: June 06, 2019, 12:06:15 pm
content: I would not buy itWe had MSO4000 and DPO4000 scopes at my college, and like all Tek digital scopes they were slow and came with a horrible UIDecoding is slow as wellThe only people who liked them were our older profs who had their last contact with the industry in the late 70s when scopes were still analogWith a budget of $4k, you should easily find something better. For example, the Agilent/Keysight DSOX3104A can often be found in that price range and it’s a vastly better scope than the DPO

author: Someone
author_rank: Super Contributor
timestamp: June 07, 2019, 12:38:17 am
content: Quote from: thememo on June 06, 2019, 09:23:45 amIgnore the haters, the Tek 4000 series is a solid and reliable scope that works well. I've used them at many different companies and never had any problem getting the job done. For the time they were a stand out product that lead across many specifications for products in that range. If it does the the thingsyouneed it to do then its a great price.

author: dogbert
author_rank: Contributor
timestamp: June 17, 2019, 11:37:18 pm
content: Have you tried Agilent/Keysight oscilloscopes of equivalent specs? Tek is not much cheaper but the interface is slow and horrible. Tek gets the job done, but if they had put more thought into user-friendliness, and if they were as kind and helpful like Agilent/Keysight for discontinued products, I'd be all for it.I'm not opposed to Tek if they offer the specs to do a difficult measurement when Keysight/Agilent doesn't. But as a troubleshooting scope that you often have to change settings and measurements, Tek is frustrating to use. If Agilent/Keysight offers the same thing at the same price as Tek, I wouldn't consider Tek at all (unless they re-designed their user interface, make it more responsive, and fix up their horrible autoscale algorithm that gives a time/div that aliases).
Kenwood CS-5400 Analog Oscilloscope (can't find manual and schematic) - Page 1
Forum section: electronics / testgear

author: Kinkless Tetrode
author_rank: Regular Contributor
timestamp: June 16, 2019, 09:14:26 am
content: Recently, I snagged a Kenwood CS-5400 100Mhz 3-channel analog scope on eBay for cheap. I'm quite pleased with it, but I'm unable to find any manuals or schematic for the CS-5400 anywhere on the net. I am not even sure of the age of this model, I'm guessing the 1980s. Google returns no hits and the only references I can find are some short youtube clips, non-english, from owners using this model Japan and China. However, manuals for the other Kenwood scope models in this family are easily found.Any suggestions on where to find a manual and schematic for it? Attached is a photo.

author: radhaz
author_rank: Regular Contributor
timestamp: June 17, 2019, 01:13:33 am
content: Maybe close enough?https://elektrotanya.com/kenwood_cs-5405_cs-5475_cs-5455_oscilloscope.pdf/download.html

author: Kinkless Tetrode
author_rank: Regular Contributor
timestamp: June 17, 2019, 05:44:47 am
content: Thanks, radhaz! This might be enough for what I need if I need to troubleshoot the scope.From the diagram, the only real differences appear to be layout of the controls and the lever switches in the front panel. All else seems to be the same with the 5400 model. I'm willing to assume that the internals are identical between the models.Thanks again.
Siglent SDG2042X Rear connectors, bring forward? - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: June 16, 2019, 08:38:06 am
content: I've got this sdg2042x in a rather small shelf, and I'd like to avoid pulling the generator out as much as I can.Can I bring the rear counter, aux and clock connectors forward to a s upmall panel or box beside or on top of the generator, without having anything untoward happen?I'm thinking like 12 to 20 inches of 50 ohm coax with cable mounted bnc-s in the back and bulkhead bnc female connectors in the panel.

author: tautech
author_rank: Super Contributor
timestamp: June 16, 2019, 09:04:04 am
content: I see no reason why you couldn't do that, maybe even with right angle BNC's so to keep the unit as far back as possible.

author: Performa01
author_rank: Super Contributor
timestamp: June 16, 2019, 11:16:49 am
content: I agree with Tautech. There's absolutely no problem having a little external connector box to make the rear inputs/outputs easily accessible.

author: bicycleguy
author_rank: Frequent Contributor
timestamp: June 16, 2019, 10:32:36 pm
content: This was my solution. Not as nice, but at least I don't have to pull the whole instrument out, turn it around and put on close up glasses just to see which connector is which.
Siglent SDM3055 bench meter relay question - Page 1
Forum section: electronics / testgear

author: DanielSpokane
author_rank: Regular Contributor
timestamp: June 16, 2019, 06:57:27 am
content: Hello,I have a Siglent SDM3055. Overall I'm very impressed with the meter. However, for the first time I was playing with the dual display mode. The dual display seems to work fine, however when I run dual AC and DC readings I hear the meter relay "clicking" about every second or so. Is that normal?

author: tautech
author_rank: Super Contributor
timestamp: June 16, 2019, 07:10:46 am
content: Quote from: DanielSpokane on June 16, 2019, 06:57:27 amYep, quite normal.The relay switches the low level signals after the dividers/shunts etc so contact life isn’t an issue.
Easter Eggs on Keysight / Agilent DSO7000A / DSO6000A - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: June 15, 2019, 09:17:19 pm
content: Hello, i have anAgilent DSO7000Aseries scope at my work. Are there anyEaster eggs?Till now I discovered the jumping letters easter egg. Sorry, i am not allowed to use a video camera at my work. The jumping letters look the same at DSO6000A.I think the DSO6000 and DSO7000 have the same software.Are there some more easter eggs in these scopes??I think that there should be a hidden game like Asteroids or something. I tried the ROCK_ON password but it did not work on DSO7000.
HP 3585A spectrum analyzer Error Codes - Page 1
Forum section: electronics / testgear

author: katzohki
author_rank: Frequent Contributor
timestamp: September 22, 2014, 11:07:25 pm
content: For the life of me I can't find the Calibration Error codes in any of the manuals I have for it. It was working fine yesterday, but today on bootup I got Calibration Error 10 and then Calibration Error 17. 10 disappeared after a bit, but 17 persists. Can anyone help? Even if you can tell me which page to go to find the codes.Not panicking...

author: MarkPalmer
author_rank: Regular Contributor
timestamp: September 22, 2014, 11:58:07 pm
content: The calibration error codes are listed in service manual volume 3, page 11-15. They only direct you to service groups rather than localize a specific problem.-Mark-

author: katzohki
author_rank: Frequent Contributor
timestamp: September 23, 2014, 12:53:33 am
content: Thanks, that helped me find the correct section. And just like that, the errors have disappeared.

author: MarkPalmer
author_rank: Regular Contributor
timestamp: September 23, 2014, 11:07:42 am
content: Sometimes it helps to have the oven reference checked and/or calibrated on these because it's one that isn't under continuous power and requires a 20 minute warm-up at power on. Why HP did it that way on the 3585A I don't know, with most of their other equipment the oven remains under power on standby when shut down. If the oven is starting to get well out of tolerance, it can give a lot of calibration errors when cold at power on until it warms up and stabilizes closer to 10 MHz where the error messages will then clear.-Mark-

author: rajeshvs
author_rank: Newbie
timestamp: June 15, 2019, 04:10:37 am
content: just for records and to help someone else with the same issue - :I had the same issue - Calibration Error 17 - on my 3585A. It was showing up on power up and wont go away even after hours of warmup. Even though the unit works it keeps popping the cal error.I could get rid of the issue by re soldering A17-R105 POT, may be dry solder/broken solder joint around this.This is the IF input level adjustmentAs per manual Cal Error 17 is caused by troubles around A17/A18/A19. Described as IF Bandwidth Amplitude ErrorAlso do not keep any heavy - ideally any - instruments on top of this SA. The top cover can not take any load and will directly load the cards and connectors inside, creating potential for troubles.rajeshwww.lazyelectrons.com
(ask)need advice about LCR DE-5000 - Page 1
Forum section: electronics / testgear

author: e0ne199
author_rank: Regular Contributor
timestamp: June 16, 2019, 12:07:01 am
content: hello everyone,i just read some articles about LCR meters in EEVBlog and some other sites and i conclude that DE-5000 is one of recommended LCR meters to buy for the price...i am about to buy it but since i am working mostly on digital electronics, will DE-5000 be useful for me and to what degree can this LCR meter be used? for example, is it accurate enough for doing some research and development? i hope to myself that i still don't get any TEA syndromeany response is appreciated, thx

author: bugi
author_rank: Regular Contributor
timestamp: June 16, 2019, 08:51:22 am
content: If you do purely digital stuff, there is not much to measure that need _accurate_ info about R, L or C. E.g. supply caps might need to be checked, but a crude value from a DMM is enough for that. Very high speed digital might need some impedance checks, though, but the impedances are usually "by design" (PCB trace geometries), and whether such trace works properly or not can be seen with oscilloscope (which is in general more useful in digital stuff than LCR-meter).So far the nearest to digital measurement that I have done (and with DE-5000, too) was to measure a detached SMD cap part of the 5V standby supply circuit of a PC PSU. Just to see if it was still ok (within a range of values that made sense according to the datasheet). Accuracy was only semi-critical, but most DMMs don't do SMD caps conveniently, especially very low value ones. Also, a blown SMD resistor in the same PSU, which was of so low value that my DMM doesn't measure there (with sensible accuracy). To my surprise, that blown resistor was still ok, but I replaced it anyway.As soon as you start connecting to analog stuff, the DE-5000 might come handy. Say, controlling motors (fans, steppers, anything), speakers, current measurement (with sense resistor(s)), some power supply types, etc.Whether its accuracy is enough for "research and development" depends solely on what is needed in a particular task.

author: David Hess
author_rank: Super Contributor
timestamp: June 16, 2019, 07:19:53 pm
content: For digital logic work, I would consider an LCR meter to be of lesser importance. It might be used to evaluate parts in switching regulators but even there, it is of limited use except in special applications.
PSU Metronix 410-32 - Page 1
Forum section: electronics / testgear

author: Bear55
author_rank: Newbie
timestamp: June 14, 2019, 07:30:23 am
content: I ask for help!I'm repairing the old regulated DC power supply Metronix model 410-32 (0-32 v, 0-14 a).I'm looking for a service manual or an electrical circuit for this model or similar.I will be very grateful for the helpto me!

author: coromonadalix
author_rank: Super Contributor
timestamp: June 14, 2019, 10:09:47 am
content: Show us inside photos and the chips / ic markings, deduction can / could be made
R&S AFG vs. Tek Sony AWG2005 - Page 1
Forum section: electronics / testgear

author: TheresNoPlaceLikeOhm
author_rank: Newbie
timestamp: June 17, 2019, 09:46:46 am
content: I have the option to acquire either of these generators, but not both. They're both complete overkill for my needs, but I'm not about turn down the opportunity. My usage scenario is pretty limited - generating audio-frequency waveforms for analysis of circuits with a 'scope and helping me learn.Any advice as to which one I should go for?Thank you
Brymen BU-86X USB interface software - Page 1
Forum section: electronics / testgear

author: rookie
author_rank: Contributor
timestamp: June 13, 2019, 09:14:21 pm
content: I got my hands on the USB interface device BU86X from Brymen. The associated software came in a CD-ROM and I don't have a CD reader anymoreAny ideas on how to get the software? The product page doesn't seem to have any software download links:https://brymen.eu/shop/bu-86x-usb-kit-for-bm52x-bm82x-bm86x/

author: Specmaster
author_rank: Super Contributor
timestamp: June 13, 2019, 09:50:25 pm
content: Buy a CD reader, they are only a few $

author: Terry01
author_rank: Frequent Contributor
timestamp: June 13, 2019, 10:17:42 pm
content: That's what I had to do and they're only £30. Obviously you can get silly money ones if want but it's up to you. They just plug in by USB

author: IanB
author_rank: Super Contributor
timestamp: June 13, 2019, 10:29:52 pm
content: When I bought a BU-86X I'm pretty sure I downloaded the software from Brymen's web site. I always like to download software because the version on the CD might be old and the download version could be more up to date.

author: rookie
author_rank: Contributor
timestamp: June 13, 2019, 10:54:25 pm
content: @IanB - not sure if it is buried somewhere on their site, but I don't see it on the product link page@Specmaster - Buying a Cd reader would be a last resort situation.

author: IanB
author_rank: Super Contributor
timestamp: June 13, 2019, 11:05:51 pm
content: Quote from: rookie on June 13, 2019, 10:54:25 pmThen don't look on the product link pageI just checked, it was three mouse clicks:home page=> Downloads => Software => pick product...

author: rookie
author_rank: Contributor
timestamp: June 13, 2019, 11:22:35 pm
content: Damn there is a .com website too?! Thanks for pointing that out @IanB , got the software
DS1074Z plus unlocking problem - Page 1
Forum section: electronics / testgear

author: orthogonal
author_rank: Newbie
timestamp: June 13, 2019, 06:20:16 pm
content: I purchased a DS1074Z plus in 2017 and then decided to retire. As a consequence, the scope sat quietly in a box for the interim.Now after roaming about the country in my RV I have a desire to use this scope. So I first upgraded the firmware to...RIGOL TECHNOLOGIES,DS1074Z Plus,DS1ZD*********,00.04.04.SP4Then I tried riglol 1.03d both online and locally got the same key from each.After reading all the postings on this subject I tried the commands to uninstall and then install the features using DSER options.I tried the scpi commands using ultra sigma via USB and then via Ethernet and just telnet to port 5555.the :SYST:OPT:UNINST command does not remove the trial options which have now expired.All attempts to downgrade the firmware failed.Entry via the control panel also yields the same response "invalid license".So, Has the private key changed or what?Has anyone else had this experience lately?

author: Fungus
author_rank: Super Contributor
timestamp: June 13, 2019, 06:43:42 pm
content: Riglol doesn't work on the "Plus" versions.

author: sv1eia
author_rank: Contributor
timestamp: June 13, 2019, 07:22:41 pm
content: This is a 'MSO' type even it says DSO. It is upgradable to MSO so it has different hardware, it includes the LA part.Its a bit difficult though here is the procedure from youtube->https://www.youtube.com/results?search_query=rigol+unlock+mso(if you are lucky and there is a JTAG pinheader connector, in later models this connector is not in place and task is really dodgy)

author: tv84
author_rank: Super Contributor
timestamp: June 13, 2019, 08:40:54 pm
content: Quote from: orthogonal on June 13, 2019, 06:20:16 pmYou should use the procedure to license a MSO1000Z -> rigup. (not riglol)Must make a memdump since your scope has it's own private key. Explore Rigol's "sniffing I2C" thread to see the various methods to obtain that dump.

author: orthogonal
author_rank: Newbie
timestamp: June 13, 2019, 08:46:02 pm
content: OK, thanks I now have a new "Yellow Brick Road" to follow.

author: tv84
author_rank: Super Contributor
timestamp: June 13, 2019, 09:01:26 pm
content: Quote from: orthogonal on June 13, 2019, 08:46:02 pmOnce you have the dump, the rest is easy.
Is the Fluke 115 suppose to do that? or its a fault? - Page 1
Forum section: electronics / testgear

author: swapnil.veng
author_rank: Newbie
timestamp: June 13, 2019, 02:07:15 pm
content: Its about my Fluke 115 Multimeter. Its displaying the correct DC voltage when its set to mV AC, but when I set it to V AC, it displays 0000. Shouldn't it display 0000 when set to mV AC and when the signal is DC? Everything else works fine. Even an AC signal in mV works properly.I put photographs for reference.

author: Wytnucls
author_rank: Super Contributor
timestamp: June 13, 2019, 02:34:05 pm
content: All normal. AC mV position is DC coupled as shown by the symbol over the mV script.Read page 11 of the user manual.
GW GPQ-3030 - Page 1
Forum section: electronics / testgear

author: Wigo
author_rank: Contributor
timestamp: June 13, 2019, 01:20:10 pm
content: Hello,I recently acquired a GW GPQ-3030 but without a manual or other documentation. Does someone have a manual or other documents for this power supply? I tried to search on google but other than two ebay listings have found nothing.
Rigol ds1000z series with 60kfm - Page 1
Forum section: electronics / testgear

author: hussamaldean
author_rank: Unknown
timestamp: June 12, 2019, 05:28:41 am
content: Hi all,I just noticed that rigol 1000z comes with 60kfmwhat does this mean ?now they support 60k waveform update or what ?mine when I bought it was saying 30K ?is this upgradable visa software ot new hardware ?regards

author: thm_w
author_rank: Super Contributor
timestamp: June 12, 2019, 09:36:10 pm
content: Yes its part of the firmware update, seems like its from a while ago (2014?). The spec sheet still says 30kwfm, so they never bothered to update that.The latest FW should be00.04.04.03.05see below:https://www.eevblog.com/forum/testgear/hacked-ds1054z-and-firmware-updates/msg1819475/#msg1819475

author: MarkF
author_rank: Super Contributor
timestamp: June 12, 2019, 09:43:59 pm
content: The latest version of the firmware is 00.04.04.04.02You can get it here:https://www.rigol.com/Support/SoftDownload/3
LeCroy 9450 -- Heatsinks falling off fix? - Page 1
Forum section: electronics / testgear

author: 0culus
author_rank: Super Contributor
timestamp: June 11, 2019, 11:35:51 pm
content: So I acquired a used LeCroy 9450 from another department at work, just to be able to have a 'scope handy in my office rather than having to go to the lab. It seems to work ok, but one thing I had to do was open it up to fish out 3 heat sinks floating around inside, that have fallen off what appear to be custom hybrid ICs in the frontend. Is there a good thermal compound that can also be an adhesive to use to fix them, plus maybe pull the others off and fix them too? I'd hate to have them all die from heat death. I'm sure I could probably scrounge up funds to buy myself something newer, but can't argue with free if I can fix it.

author: DaJMasta
author_rank: Super Contributor
timestamp: June 11, 2019, 11:44:18 pm
content: Is there any chance their retention clips came off or otherwise broke? There are good thermal adhesives, but they will be permanent, and if you ever need to remove them they will be very difficult to get off without damage (though I've heard suggestions of some alternatives).I'd try to secure them mechanically if possible, but for permanent bonds I've had good luck with Arctic Silver Adhesive (a two part epoxy). For less strong bonds and less massive heatsinks, thin, double sided thermal tape can do a good job, and I've heard of people using normal thermal paste with just a dab of superglue on a couple of corners to hold it in place, but haven't tried the method myself.

author: 0culus
author_rank: Super Contributor
timestamp: June 12, 2019, 12:45:44 am
content: Quote from: DaJMasta on June 11, 2019, 11:44:18 pmMaybe. I'll have to pull the boards to get a better look.
Power supply clone Fear, Uncertainty, and Doubt - Page 1
Forum section: electronics / testgear

author: rea5245
author_rank: Frequent Contributor
timestamp: June 10, 2019, 09:34:17 pm
content: Hi,I'm in the market for a new benchtop power supply and I'm considering the Mastech HY3005D or GPC-3030D. These units seem to be cloned frequently - I've seen similar looking ones under the brand names Dr. Meter, Unisource, and several others. But they're apparently not all the same inside: some of them have gotten pretty seriously panned here and elsewhere for problems like overshoot and lousy construction.Mastech itself does not help matters: their web site sells some of their supplies under the Mastech brand, others under the Volteq brand, and they switch their numbering system from things like HY3010D to GPC-3030D even within the brand name. And there are reviewers who throw shade on Mastech too. All this makes me worry that there's no way to know whether I'm getting a well designed supply or piece of junk.Is it "safe" to buy any of these supplies? Or should I lay out another 2-3 hundred bucks to get a known, respected quantity like a Siglent or Rigol? My needs are simple; Siglent and Rigol are probably overkill for what I need. But I certainly don't want voltage overshoot to fry my projects.(I've considered used HPs and the like, but the ones in the $200 range lack a lot of modern features like digital displays, current control, and separate displays for each channel.)Any help is appreciated.Thanks,Bob

author: Performa01
author_rank: Super Contributor
timestamp: June 11, 2019, 11:22:55 am
content: My (limited) experience with Mastech wasn't that good. A triple power supply, that a colleague at work had purchased in a pinch, looked similar to (or even was) a GPC-3030D. It was really basic, looked cheap and did not survive very long on top of that, despite it's only ever been used with moderate loads.The triple supplies in my private lab are old and obsolete, yet useful, and then I have a bunch of single supplies, where I have mixed experiences with Manson – the cheap ones are usable but certainly not great, whereas the more expensive ones (like SSP-8160) are excellent.If I were to buy a new triple power supply today, I would consider the Siglent SPD3303C. Even though I have no user experience – only played with it a little at a fair – I am positive that it is a solid performer, it has all the features you’d normally expect (and need) and I really like the conservative design, especially the display:https://www.siglentamerica.com/power-supplies/spd3303c-series-programmable-dc-power-supply/Price wise it should not be that much more than the Mastech.

author: Grandchuck
author_rank: Super Contributor
timestamp: June 11, 2019, 12:55:26 pm
content: I have a Mastech HY3005F-3 and it works fine. I have not used it a lot, however, and have never checked it for overshoot or any issues of that nature.
Hameg HM604 Photographs - Page 1
Forum section: electronics / testgear

author: JuanGg
author_rank: Regular Contributor
timestamp: June 10, 2019, 10:12:43 am
content: Just bought a second-hand Hameg HM604. It just needed some calibration and fixing a broken rod coupler to get it up an running. Here are some photographs of the inside should anyone find them useful.There is a stain on the screen. It's not on the CRT, but on the protective plastic that goes on top. It's not moisture or anything, seems like a film that has peeled of, as touching the screen moves it around.The front panel seems a pain to get out, so I may leave it as is for now.Juan

author: D Straney
author_rank: Frequent Contributor
timestamp: June 10, 2019, 10:03:35 pm
content: That internal style is interesting to see: I've seen photos of old high-end Tektronix CRT scopes and newer lower-end digital scopes, but haven't seen an older lower-end analog scope before.The "West Germany" label on the silkscreen is a nice historical touch too.
Don't know how to pick up data from UNIT-T (UTD2052CL) - Page 1
Forum section: electronics / testgear

author: quinton226
author_rank: Newbie
timestamp: June 10, 2019, 09:03:02 am
content: Hello everyone,recently i have brought a oscilloscope for making a test for Solar Panel (anti-islanding test)mainly i want to know test if i turn off the main electrical supply, the inverter will turn off within 200ms.so i get the current in CH-1 and Voltage in Ch-2, and i use "Utility" button and record the waveform.sadly that i can just get the page with full of waveform and none of waveform but the instantaneous changes.how can i get the instantaneous changes, that i can know the invertor is turned off within 200msThanks all guys!!!!!
'The Spirit of Tek' great doco about Tektronix - Page 1
Forum section: electronics / testgear

author: snoopy
author_rank: Frequent Contributor
timestamp: June 10, 2019, 01:33:34 pm
content: This doco is a great watch for anyone interested in the history of a great US company.So many spin offs came from Tektronixhttps://www.pbs.org/video/oregon-experience-the-spirit-of-tek/
Scaling the screen of Keihtley 2450 - Page 1
Forum section: electronics / testgear

author: balage
author_rank: Regular Contributor
timestamp: May 22, 2019, 11:47:57 am
content: Hi There,I am using a Ketihely 2450 SMU currently for insulation resistance tests. It can measure up to 20 TOhms. So I would like to scale the screen to show resistances from 0 to 20 TOhms just like on the image attached.There are fixed values that can be selected in the 2450, but there is no option for 2 TOhms/DIV. There is 1 and then 10 TOhms/DIV. Can you please help me how can I set the display's scale similar to the image attached?I need to make screen captures with the same scale to make them easily compareable.Thanks,

author: Brad O
author_rank: Regular Contributor
timestamp: June 07, 2019, 06:30:53 pm
content: Hi balage,Currently, there's no way to precisely control the axis scaling like that. There's a firmware release for the 2461 coming in a couple months that will add remote commands to control the scaling precisely (also via on-box scripts) but unfortunately there not present in the currently available firmware.

author: balage
author_rank: Regular Contributor
timestamp: June 07, 2019, 08:56:49 pm
content: Hi Brad,Thanks for your reply!I see, okay. So it will not be available for the 2450.Cheers,

author: Electro Fan
author_rank: Super Contributor
timestamp: June 07, 2019, 10:27:03 pm
content: Quote from: Brad O on June 07, 2019, 06:30:53 pmHi Brad,Maybe once the scaling feature is released for the 2400 series it might become available for the DMM6500?

author: balage
author_rank: Regular Contributor
timestamp: June 08, 2019, 03:45:30 pm
content: Quote from: Electro Fan on June 07, 2019, 10:27:03 pmWait, does the 2461 firmware release mean the whole 2400 series will be updated?
Profile/Thor Labs LDC400 Manual, anyone? - Page 1
Forum section: electronics / testgear

author: nfmax
author_rank: Super Contributor
timestamp: June 24, 2018, 09:09:25 pm
content: I have acquired a Profile (Thor Labs) LDC400 GPIB-controlled laser diode driver, fitted with an LDC402 current driver and a TEC420 temperature controller. I can't find any information about it, although I think I might have found the correct DB-9 connector pinouts (based on cable specifications). Before I start reverse-engineering it, does anyone have a manual? Any of a user guide, programming guide, service manual, application note or even a brochure would all be welcome!

author: nfmax
author_rank: Super Contributor
timestamp: October 08, 2018, 09:56:08 am
content: Thanks to forum member Marc, I have been able to borrow & scan a copy of the original manual!

author: HAL9000
author_rank: Newbie
timestamp: May 31, 2019, 02:48:59 pm
content: I have exactly the same problem. Is the manual still available? Would be so much help, thanks!

author: HAL9000
author_rank: Newbie
timestamp: June 04, 2019, 09:03:49 am
content: Just an Update: nfmax sent me a copy of the original manual! I am now using the oldschool laser diode driver with no issues

author: kambgr
author_rank: Newbie
timestamp: June 07, 2019, 01:35:16 pm
content: Hi! I'm looking for the same documents.Could you please help me?

author: nfmax
author_rank: Super Contributor
timestamp: June 07, 2019, 01:39:46 pm
content: Quote from: kambgr on June 07, 2019, 01:35:16 pmTo anyone wanting a PDF of the manual: send me a PM with your email address & I will send a (temporary) link you can download from. It's about 30MB in size!
Test equipment using an IR IC for the keyboard - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: June 07, 2019, 01:35:32 am
content: I've seen certain pieces of test equipment with a keyboard which uses an infrared remote transmitter IC (or other serial transmitter) which has a single unidirectional data line to send a key code to the microcomputer section.Do you know of any other pieces of test equipment which has the above characteristics?Such examples of equipment I have seen are the Philips PM5193 function generator, Philips PM551x/PM541x TV pattern generators, and the Katherin MFK85 TV/radio signal meter (I've added IR remote functionality to my PM5193 and PM551x!)
Agilent 54845A Display Artifacts  - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: June 05, 2019, 12:33:52 am
content: Hello All:I found a very pretty reasonable price on a Agilent 54845A. While it passes all self test, I get the following when injecting a signal on any channel.Since I am seeing all the self test pass, was wondering if anyone could point me in the right direction. When I saw this fault before buying it, I assumed it was likely a DAC fault.Rich

author: Stray Electron
author_rank: Super Contributor
timestamp: June 05, 2019, 02:47:06 am
content: Can that scope also display FFTs? If so I'd see what that shows with the same input. If it's just a display artifact, then you should have a clean FFT without any harmonics.

author: AJ3G
author_rank: Regular Contributor
timestamp: June 06, 2019, 01:06:04 am
content: Hello:Yes it did have a clean FFT. I am beginning to think this may be a fault in the A6 board. Might be time to see if someone has a parts donor that I might be able to purchase the part from.Thanks,Rich

author: nctnico
author_rank: Super Contributor
timestamp: June 06, 2019, 09:36:59 pm
content: What happens if you disable the menus, cursors, measurements, etc? To me this looks like a stuck bit somewhere in a databus. I have a feeling this oscilloscope has two display modes: one high speed (with all measurements and menus disabled/hidden) which uses hardware accellerated trace drawing on a video overlay and one mode which uses the CPU to draw the traces with measurements and so on.I doubt this shows up in an FFT.

author: 2N3055
author_rank: Super Contributor
timestamp: June 06, 2019, 10:03:56 pm
content: Try it with triangle wave, it might be easier to depict pattern. It does look like a stuck/shorted bits on memory bus, or memory chip problem.. If it doesn't show in FFT than it is not acquisition memory but display mem.
New TEKTRONIX serie 3 and 4 @ the Dutch Belgian Sweedish agent's site - Page 1
Forum section: electronics / testgear

author: Figaro
author_rank: Newbie
timestamp: June 09, 2019, 07:31:50 am
content: https://www.cnrood.com/en/o/tektronix-new-products

author: tautech
author_rank: Super Contributor
timestamp: June 09, 2019, 07:34:29 am
content: https://www.eevblog.com/forum/testgear/tektronix-new-scope-june-4th!/
Agilent Logic Analyzer 90-pin probes - Page 1
Forum section: electronics / testgear

author: mevgheni
author_rank: Newbie
timestamp: June 05, 2019, 10:05:39 am
content: Just got an Agilent 16902a Logic Analyzer with 4x 16950a board (sadly only 4M option) for $400 on eBay. Feels like a good price to me, but thats not the point. It only came with the cables directly attached to the 16950a boards (as they are non-detachable, at least non-trivially-detachable, othervise im sure I wouldnt get them either). I do actually have an 16702b analyzer with flying leads probe adapter, so I was hoping to use those, but.. The old cables terminate into 40-pin plug, and the new ones terminate into a 90-pin plug instead. Needless to say, they dont fit...Now, finally to the point of this post, do any of you know where to get single ended (and also, differential, if possible) flying leads probing adapters for the 90-pin connector for non-exuberant prices? eBay wants an arm and a leg for them (double of what I paid for the entire system for a single adapter).Also, are there any hacks for this kind of LAs? Mine is running WinXP. Mostly interested in Protocol Recovery software license (or whatever it's called, the one that lets you decode standard low-speed serial protocols), as as of now, it can't even decode SPI... Card's memory is also apradable to 64M, but that seems to involve reflashing the board's fpga with a new bitstream (based on vague description of the upgrade procedure from Agilent docs).
DSLogic Plus and CAN decoding, hint - Page 1
Forum section: electronics / testgear

author: ColCon
author_rank: Contributor
timestamp: June 05, 2019, 11:23:12 pm
content: This helpful hint from the lads athttps://www.dreamsourcelab.com:For CAN bus signal, you need to connect signal channel of DSLogic to CAN_L and gnd to reference ground of CAN bus.The threshold for CAN_L should be set to 2.0vI have tried this and it works great.Cheers,Colin
OWON XDS3104E with VGA out does it help? - Page 1
Forum section: electronics / testgear

author: ColCon
author_rank: Contributor
timestamp: May 17, 2019, 12:46:36 am
content: Just wondering if anyone has used the VGA out option on the OWON XDS3104E oscilloscope?I have a new Siglent SDS1104X but I just can't read the fine print on the screen. I thought maybe a unit with an exteral monitor might help.Thanks for you thoughts.

author: tautech
author_rank: Super Contributor
timestamp: May 17, 2019, 01:02:43 am
content: Welcome to the forum.Do you have a PC close by to where you use your SDS1104X-E ?The webserver feature porting the display or full control onto a monitor might be useful for you.Watch this from ~50s in:https://youtu.be/Cxh_Liay09E

author: ColCon
author_rank: Contributor
timestamp: May 17, 2019, 03:02:19 am
content: Thank you so much. I read it could be controlled from a browser but I never followed up. This looks very nice. I'm going to give it a shot.As an aside, I ordered my SDS1104X-E May 2 from Amazon.ca for CDN$ 615.46.Today the price is CDN$ 737.88 + 35.39 shipping.

author: tautech
author_rank: Super Contributor
timestamp: May 17, 2019, 05:47:59 am
content: Happy to help.Ideally you'll want an extra LAN port for the X-E close to the PC and X-E so to retain your web connectivity for your PC and have your LAN DHCP available to assign a non-conflicting IP to the X-E, then just use that IP from the X-E in the browser window for instant connectivity.It's all pretty easy.Wow that's quite a price increase !For further tips on X-E usage and features see these pages:https://www.siglentamerica.com/videos/sds1000x-e-series/https://www.siglentamerica.com/operating-tips/sds1000x-e-series/https://www.siglentamerica.com/application-notes/sds1000x-e-series/

author: ColCon
author_rank: Contributor
timestamp: May 18, 2019, 02:57:37 pm
content: Hey thanks again. With only a moderate amt of cursing I managed to get the scope hardwired to the laptop while holding on to wifi connectivity. And the laptop wired to a 30 inch tv with hdmi. This is pretty slick; I guess I'll keep theSiglent. In spite of the squishy on top of mushy pastel buttons.

author: ColCon
author_rank: Contributor
timestamp: June 14, 2019, 07:53:51 pm
content: To answer my own question:The VGA out works but you probably won't need it. The regular display is huge enough that I can read all the numbers wihout going nose-to-glass, which is a good thing, what with it being a touch screen and all.