hybridfree/eevblog-posts huggingface dataset:
Should scope probes be wound up that tight? - Page 1
Forum section: electronics / testgear

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 12, 2021, 07:43:00 pm
content: https://www.ebay.ca/itm/333209432476?hash=item4d94d4719c:g:RDEAAOSwnvFcvzZbI want some more of these sweet HP sub-mini probes but I don't think a cable should be tied up tighter than shoelaces.What do you think? Won't it cause the thin inner conductor to move around in the dielectric?

author: jpanhalt
author_rank: Super Contributor
timestamp: September 12, 2021, 07:57:54 pm
content: That doesn't look like it is less than 5x the diameter:https://www.ia.omron.com/support/faq/answer/41/faq02669/index.html#:~:text=A%20minimum%20bending%20radius%20of,coaxial%20cables%20and%20shielded%20cables.Personally, I coil mine to about a 4" to 5" diameter and store individually in Ziploc bags (1 qt size) .

author: richmit
author_rank: Contributor
timestamp: September 12, 2021, 09:04:31 pm
content: It looks like the bend radius is OK for the cable diameter; however, most people coiling cables like this will do so in such a way as to twist the cables along the axis -- which tends to shorten the life of the cables. People who work with long cables, like stage hands, usually use a special coiling technique to minimize the twist in the cables.I store mine in zip-loc bags. I coil them pretty large and am careful not to twist them.

author: Fungus
author_rank: Super Contributor
timestamp: September 13, 2021, 12:10:10 am
content: Quote from: Alex Eisenhut on September 12, 2021, 07:43:00 pmI Wouldn't do it habitually but that looks like a one-off done by somebody who was dumping stuff and didn't care.For $25? I'd take a chance.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 13, 2021, 01:22:03 am
content: I'm on the fence, thanks all.

author: David Hess
author_rank: Super Contributor
timestamp: September 13, 2021, 04:17:19 am
content: Quote from: Alex Eisenhut on September 12, 2021, 07:43:00 pmIt can break the inner conductor but on oscilloscope probes, the very thin conductor is pleated to prevent this. If the conductor is going to be broken, then it tends to happen at either end where the strain is greatest.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 13, 2021, 12:12:10 pm
content: Quote from: David Hess on September 13, 2021, 04:17:19 amI noticed the pleating when I stripped some old cables open. I just think anyone that macramés their probes probably does other horrible things to them as well...I think I'll skip these, I'll wait for a complete kit with the fun DIP clips and accessories.
EXTECH 330 Multimeter loose positive input jack. - Page 1
Forum section: electronics / testgear

author: roymoran
author_rank: Contributor
timestamp: September 14, 2021, 08:49:32 pm
content: I've had this extech 330 for a little over a year. The other day I noticed my measurements weren't registering. It was easy to see that this was an issue with my input jack because I slid the lead in/out slowly until it worked. I had to do this all day to get proper readings. I opened it up and noticed that the contact between the pcb and positive input jack comes loose, zero contact between them. Has anyone faced this issue? How did you fix?Attached an image for clarity.Edit: I should say that I tried soldering the jack back onto the PCB, but I wasn't able to. The solder didn't make good contact with the pad for some reason even with a generous amount of flux paste.

author: Grandchuck
author_rank: Super Contributor
timestamp: September 14, 2021, 09:07:38 pm
content: Maybe you can scratch off the solder mask and then use a solid wire jumper between the PC trace and the metal of the jack?

author: LaurentR
author_rank: Frequent Contributor
timestamp: September 15, 2021, 12:51:52 am
content: What caught my eye is how close the terminal on the right is to that current shunt

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: September 15, 2021, 01:03:40 am
content: Not sure what type of iron you are using, but the metal tab will act as a huge heat sink to draw down on your tip temperature to the point the solder does not make a proper joint, especially if your iron is not powerful enough or not having good temperature control.I have a couple 320 for about 8 years now, both have awful build quality. I have not seen this problem, but I also rarely use those meters.

author: tautech
author_rank: Super Contributor
timestamp: September 15, 2021, 02:08:50 am
content: Yes well even looking at the build quality quickly it's very apparent the soldering job on the whole PCB is real muck !Most of the TH component solder pads haven't had the solder wick through the PCB to provide a strong and secure solder joint.Trash it or reflow the entire PCB after removing it from the case and attacking it with a decent iron and lead based solder instead of that PB free muck.
BM235 incorrect amp readings - Page 1
Forum section: electronics / testgear

author: bright_ideas
author_rank: Contributor
timestamp: September 12, 2021, 10:07:29 pm
content: My BM235 is currently reading very high amperages when measuring just a typical AAA battery. It reads over 4A. An 18650 Samsung 26F reads over 9A. What is wrong?! Help!

author: J-R
author_rank: Super Contributor
timestamp: September 12, 2021, 11:01:49 pm
content: Well, assuming you are shorting out the battery with the DMM, that is how much current it can generate given the low resistance of the test leads and the DMM. Don't do that. Place the device that normally would consume the battery in series with the DMM, then take the measurement.

author: james_s
author_rank: Super Contributor
timestamp: September 13, 2021, 03:41:07 am
content: What on earth would you expect to see if you try to measure amps across a battery? It's a good thing you didn't try to measure the amps out of a wall socket.
LCR substitution Box - Page 1
Forum section: electronics / testgear

author: Dave Turner
author_rank: Frequent Contributor
timestamp: September 11, 2021, 07:00:14 pm
content: In passing I recently came across a design for a LCR substitution box which could also be configured as various filters.As I recall it had 3 2 pole 24 way rotary switches for L, C & R, several toggle/slide switches and at least one multi turn pot.The board and components were also available as a kit from the designer in Europe, possibly Germany.I've lost the URL and haven't been able to rediscover it.Does this ring a bell with anyone?ciaoDave

author: HKJ
author_rank: Super Contributor
timestamp: September 11, 2021, 07:22:42 pm
content: Yeshttps://www.ak-modul-bus.de/stat/rlc_box_standard,pd730!0,,RLC-BOX1.htmlYoutube:https://www.youtube.com/channel/UCd8CdLp2bKP6Uv0jvdLdiRA

author: Dave Turner
author_rank: Frequent Contributor
timestamp: September 11, 2021, 07:45:17 pm
content: That's the one.Thank you.
Divide math function on Keysight Infiniium scopes - Page 1
Forum section: electronics / testgear

author: Omicron
author_rank: Regular Contributor
timestamp: September 04, 2021, 09:20:45 am
content: I'm trying to set up a math function to compute 1/channel1 on a Keysight S-series scope. I've selected the "divide" function and selected a constant of value 1 as source 1 and channel1 as source 2. But it seems that no matter what signal I apply, the resulting math trace is saturated at infinity for some reason. The input signal I'm using is between 2V and 0.5VAnyone an idea of what might be going on? Is this a bug in these scopes?

author: Omicron
author_rank: Regular Contributor
timestamp: September 10, 2021, 03:32:48 pm
content: Small update for anyone running into the same issue: it's been confirmed as a bug in the software by Keysight support.
Playing with short current pulses on multimeters - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: September 10, 2021, 05:58:55 am
content: NOTE: This is a release of an OLD VIDEO that was previously for Patrons and supporters only.I'm testing the true RMS pulse response of five different meters. Brymen BM235, BM786, BM869, Keysight U1272A, and the never released EEVblog 555 meter.

author: David Hess
author_rank: Super Contributor
timestamp: September 10, 2021, 07:25:00 pm
content: For logarithmic RMS computation, the bandwidth varies with signal level so at low levels the settling time can be quite long and settling to zero will be extended.

author: joeqsmith
author_rank: Super Contributor
timestamp: September 11, 2021, 12:48:49 am
content: If I run the same test, the 78605 doesn't appear quite as fast as what you show. 78908 is slower. 869-PA is by far the slowest.I have a couple of CEM meters that are the same model. They act totally different from one another. Closer inspection, they had used two different brands of the same RMS converter. I never took it any further to see if this was the root cause.
Practical uses/tricks/tips for DMM continuity adjustable Ohms threshold? - Page 1
Forum section: electronics / testgear

author: t1d
author_rank: Super Contributor
timestamp: September 06, 2021, 04:56:12 am
content: My Siglent has this feature and I am wondering about using it? Please and thank you.

author: bdunham7
author_rank: Super Contributor
timestamp: September 06, 2021, 05:01:39 am
content: What are the thresholds? I have a 10R resistor that I put across mine, then I select 1R as the threshold. This allows me to do a continuity check with only 10mV open circuit test voltage and the actual ohm readings are only slightly off below 1R.

author: tautech
author_rank: Super Contributor
timestamp: September 06, 2021, 05:45:01 am
content: Go/No Go measurements.

author: masterx81
author_rank: Frequent Contributor
timestamp: September 07, 2021, 08:24:53 am
content: Sometimes a defective component can fail not totally closed, sometimes let's say at 50ohm. If your meter has (for example) a fixed threshold at 30ohm, you have to watch eveery time the display of the meter while isolating sections of the circuit to find the defective component. I not have a meter with that feature, but i remember at least some cases where I would have liked to have it.

author: janiorib
author_rank: Newbie
timestamp: September 10, 2021, 02:05:46 am
content: Well, the UT181a has this functionality where you can set the minimum or maximum value for the alert
Siglent SVA1015X external trigger interface - Page 1
Forum section: electronics / testgear

author: schildch
author_rank: Newbie
timestamp: September 08, 2021, 12:25:22 pm
content: I got today a Siglent SVA1015 spectrum analyser / VNA. The main purpose for which this device was purchased was for RF pulse amplitude demodulation. The device needs to be triggered by an external source which also triggers other devices in the RF chain. The timescale that I am interested in is <1ms. Unfortunately, the external trigger has a delay of ~7ms and jitters by ~3ms, rendering this device unusable because all the action happens in the first millisecond. This leads me to suspect that they skipped a dedicated hardware trigger interface to the FPGA and are doing some kind of software triggering.Does anybody of you know if this behaviour is normal? In the documentation, there is no hint to such an inferior trigger interface.

author: t1d
author_rank: Super Contributor
timestamp: September 10, 2021, 01:42:57 am
content: Send a private message to "tautech." He is one of our Siglent guys,
Fluke 8025A bad resistance readings - Page 1
Forum section: electronics / testgear

author: stereo71
author_rank: Newbie
timestamp: September 21, 2021, 12:10:25 am
content: Recently got a Fluke 8025A, "not working" because it had a bad battery connector. Replaced the connector and it passes self-test. On voltage it will zero nicely. But on Ohms, it acts like it's shorted. On diode mode, it plays it's tone constantly and the meter counts up. Any suggestions what I should check internally? The fuses seem good, all three check for continuity. Looks to have very little wear, very clean. Would like to get it working for a friend to use.

author: rvalente
author_rank: Frequent Contributor
timestamp: September 21, 2021, 01:32:18 am
content: I always started cleaning the board, everything goes to a soapy water bath and everything is thoroughly scrubbed with an old tooth brush. Grease, cap juice and all kind of nest things maybe conductive.Do you have the service manual?https://elektrotanya.com/fluke_25_27_sm.pdf/download.html

author: stereo71
author_rank: Newbie
timestamp: September 21, 2021, 11:20:02 am
content: Yes, I have the 27 service manual (later edition) which looks very similar. My 8025A is Military version, made in the late 80s. There are no electrolytic caps in it; internally, it is very clean. No visually obvious damaged parts. Will read through the manual first before attempting to test anything.
siglent SDS1122e+ problem - Page 1
Forum section: electronics / testgear

author: jack-c
author_rank: Contributor
timestamp: September 09, 2021, 11:44:27 am
content: The boot stops and the boot screen is no longer saved. How can I restore it?

author: FlexibleMammoth
author_rank: Regular Contributor
timestamp: September 09, 2021, 12:42:13 pm
content: This scope has drip marks and dirt everywhere. There is a good chance your board is corroded and this needs professional repair...You can try to perform a hardware reset using these instructions:https://siglentna.com/operating-tip/oscilloscope-hardware-reset/In some extreme hardware errors, the oscilloscope may become unresponsive or “hang” during the boot sequence.If your oscilloscope is frozen, will not boot, or appears to be unresponsive, you can attempt a hardware reset by following these instructions:1. Disconnect all USB, LAN, and input cables. Leave the power cord connected.2. Power cycle the instrument by pressing the power button.3. Immediately begin pressing the MATH button repeatedly at a rate of 2 to 3 times a second while the instrument boots up.4. If the instrument does not boot up properly, retry steps 2 through 4.NOTE: If you continue to have problems, contact your nearest SIGLENT office for service.

author: jack-c
author_rank: Contributor
timestamp: September 09, 2021, 01:16:29 pm
content: I have tried pressing the math key but it didn’t work. I changed to a flash with a program but still the same failure.

author: tv84
author_rank: Super Contributor
timestamp: September 09, 2021, 02:08:49 pm
content: I would start by cleaning all that board mess.

author: jack-c
author_rank: Contributor
timestamp: September 09, 2021, 03:26:32 pm
content: Now I can't tell whether it is the ddr problem or the FPGA

author: tautech
author_rank: Super Contributor
timestamp: September 09, 2021, 05:40:37 pm
content: E+ is a China only range and somewhat of a hybrid between CNL+ and CML+.Just which recovery package would work on it IDK.
Rohde & Schwarz RTM1054 - Applications Bundles  - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: September 09, 2021, 02:42:57 pm
content: All:I recently acquired an R&S RTM1054. It appears as though the Applications Bundles for Serial Decode are no longer supported. I read a post from years ago that suggested someone was working on unlocking this, but the trail goes cold from there. Has anyone figured out a way to activate these yet? I would also be interested in upgrade hack's, if there are any.Thanks in advance!Rich
Agilent 34410A  display an MCU Error - Page 1
Forum section: electronics / testgear

author: Wade2019
author_rank: Contributor
timestamp: July 21, 2021, 03:42:29 pm
content: Hello everyoneI have a 34410A. Unfortunately, the display panel MCU NXP LXP932 faulty button is invalid. If anyone has the display firmware, I would like to share it. Thank you very much.

author: kevinwolfsky
author_rank: Newbie
timestamp: September 08, 2021, 03:06:39 am
content: I have same problem,any idea?
LCR-T4 12864 LCD - Page 1
Forum section: electronics / testgear

author: stani9898
author_rank: Newbie
timestamp: September 09, 2021, 11:08:15 am
content: Hi, i bought this cheap tester but unfortunally has arrived with a broken lcd . So i have think to utilize the tester by reading the values on a pc, for example with the serial monitor. I want know also if i can reprogram the tester in order to use an 16x2 lcd display (1602a). I don't know how to do that, so if you have any tips... Thank you very much

author: coromonadalix
author_rank: Super Contributor
timestamp: September 09, 2021, 02:18:03 pm
content: normally you have to get the code and add an serial print into it but it wont give any graphical device / image / pinout ...check the thread :https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/

author: madires
author_rank: Super Contributor
timestamp: September 09, 2021, 02:38:10 pm
content: T4 clones usually have an ST7565 display which is easy to obtain.

author: stani9898
author_rank: Newbie
timestamp: September 09, 2021, 03:09:10 pm
content: The price is still too high compaired with the LCR-t4, my goal is just to read the state of a capacitor, but i'm struggling because i don't how to customize an hex file to add the serial monitor.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 09, 2021, 07:00:28 pm
content: or adding a 4x20 characters lcd thru some bodge wirings ....

author: tanveerriaz
author_rank: Contributor
timestamp: September 10, 2021, 04:14:24 am
content: i get 4 LCR-t4 flea market. 2 with broken lcd . how add a i2c 1602 lcd ?

author: stani9898
author_rank: Newbie
timestamp: September 10, 2021, 07:13:53 am
content: The key is to customize the firmware i think. It is a pity to throw these testers away

author: indman
author_rank: Super Contributor
timestamp: September 10, 2021, 07:22:36 am
content: Quote from: tanveerriaz on September 10, 2021, 04:14:24 amGuys, above suggested a link to the main thread, where they discuss all Chinese clones and their problems. Why create unnecessary duplicate threads? Contact the main topic and you will get help.

author: stani9898
author_rank: Newbie
timestamp: September 10, 2021, 02:57:42 pm
content: Quote from: tanveerriaz on September 10, 2021, 04:14:24 amHere the solution, work for me.https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/7075/Reply #7079
Using Scope Probes on Multimeters - Page 1
Forum section: electronics / testgear

author: mendip_discovery
author_rank: Super Contributor
timestamp: September 06, 2021, 02:17:16 pm
content: I have several Clamp Meter type probes and a High Voltage probe for an Oscilloscope and wondered if there was a way to measure the output on a Digital Multi Meter such as an Agilent 34401A. Now I know this won't work right off the bat due to a mismatch in load from the Scope to DMM.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 06, 2021, 02:44:49 pm
content: The clamp type probe has a good change to work, maybe marginally of due to the different load resistor, but one may not notice the difference.The high voltage probel would likely need an extra 1 M (or 1.1 M if the meter has 10 M input impedance) in parallel to make it lokk more like the scope. AC would be limited (low frequency only) as the DMM usually has higher input capacitance than the scope. For the high voltage type, keep in mind that the DMM is usually not grounded like a scope. It may need an extra ground link.

author: bdunham7
author_rank: Super Contributor
timestamp: September 06, 2021, 02:54:39 pm
content: AC or DC? You would have to be very specific which probes you are using and how, but yes sometimes you can make that work. On occasion for DC I will use a 10X scope probe with a Hi-Z DMM to avoid any resistive or capacitive loading on the circuit. It takes a very, very long time to settle (minutes) due to the DMM input capacitance but it does work. Also DC capable clamp probes generally work fine with DMMs. AC circuits will be much trickier to get any sort of accurate result.

author: Kean
author_rank: Unknown
timestamp: September 06, 2021, 05:24:12 pm
content: You can maybe use Pintek PL-10/PL-10N to match impedance, and MT-246/MT-246N BNC to banana plug adapter.I've used this with my Pintek 15kV HV probe.http://www.pintek.com.tw/
Datron 1082 Firmware SN17496 - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: September 05, 2021, 12:56:59 am
content: Hi All,Here is the firmware for my Datron 1082, it may help someone one day.I included two versions of the firmware files, in both HEX and BIN formats, use as appropriate.File names, firmware versions, and EPROM types are below:Datron1082_M3 290121-21 04-04-87 TMS25L32JL-45.binDatron1082_M3 290121-21 04-04-87 TMS25L32JL-45.hexDatron1082_M18 290120-22-O 06-05-87 NMC27C32.binDatron1082_M18 290120-22-O 06-05-87 NMC27C32.hexDatron1082_M30 290119-22-O 06-05-87 NMC27C32.binDatron1082_M30 290119-22-O 06-05-87 NMC27C32.hexDatron1082_M35 290118-22-O 06-05-87 NMC27C32.binDatron1082_M35 290118-22-O 06-05-87 NMC27C32.hex
ATTEN ADS1102CML - Page 1
Forum section: electronics / testgear

author: jack-c
author_rank: Contributor
timestamp: September 05, 2021, 02:08:43 pm
content: Hello, I have this oscilloscope at the start interface. I removed the flash to read the content and it seems that the content is incomplete. Now I can’t confirm whether the firmware or other hardware is faulty, so please send me one Full firmware available thanks

author: kcbrown
author_rank: Frequent Contributor
timestamp: September 06, 2021, 03:02:29 am
content: From what I can tell, that's almost certainly the same as the Siglent SDS1102CML. Siglent no longer seems to host the firmware for that model.However, it's also (from everything I can find) the same as the LeCroy WaveAce 1012, and Lecroydoesstill host the firmware for that:https://teledynelecroy.com/support/softwaredownload/documents.aspx?sc=15You'll need to register an account with them in order to be able to perform the download (the above is the page that contains the download link).

author: jack-c
author_rank: Contributor
timestamp: September 06, 2021, 05:43:41 am
content: Thank you, I have been able to boot up by pressing the "math" key all the time and I have upgraded its firmware to sds1102cml,

author: tv84
author_rank: Super Contributor
timestamp: September 06, 2021, 11:59:37 am
content: Quote from: jack-c on September 06, 2021, 05:43:41 amSo, all good?

author: jack-c
author_rank: Contributor
timestamp: September 06, 2021, 02:59:58 pm
content: Yes, I brushed the firmware of siglent, and the boot shows that sds1102cml long storage also exists.
Strange pattern on R&S RTB2004 screen (powered off) - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 05, 2021, 07:36:06 am
content: Recently I started to see an unusual pattern on the screen of my RTB2004, also when turned off.Looks like hexagonal pads. I never glued anything to the screen, like a screen protector.Might want to check with R&S, but was wondering if others have had similar issues?

author: thinkfat
author_rank: Unknown
timestamp: September 05, 2021, 08:57:32 am
content: That will likely turn out to be a screen defect. It looks like the some part of the screen assembly is coming apart, maybe the digitizer is delaminating from the actual display.

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 05, 2021, 07:12:12 pm
content: Quote.Yes, that’s what came to my mind too. Like this scope, would not like to have to send it off for repairs, but I probably need to do that after all…
IVYTECH AC Power Source - Page 1
Forum section: electronics / testgear

author: Azure
author_rank: Contributor
timestamp: August 10, 2020, 01:46:09 am
content: Does anyone have any knowledge or experience with the IVYTECH APS4000 or APS5000 series AC Power Source units?Read several posts about some BK and Chroma units but they are out of my price range (and even at that price those models are still too low for my power needs).Need to be able to control AC voltage and current (isolated) ideally up to around 4KVA but budget wise more like 2KVA. Only need mains frequency (AU mains 240VAC 50Hz), higher frequency output not really needed.Use is for testing during repair work on high(ish) power lighting ballasts and would be used for other smaller SMPS repairs.Currently have a large Variac and separate Isolation transformer but it is a bit too bulky and inconvenient and lacks any form of current limiting.

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 04, 2021, 09:27:51 pm
content: Hi..I got a APS-4000B, had it for about one year now. Not used it so much, but it has been ok to the small jobs ive used it to, mainly amplifier for flywheel development and testing.It sells under diffrent names, no name, IVYTECH and Matrix.https://www.alibaba.com/product-detail/APS5000A-500VA-five-Digital-Programmable-AC_60789630229.html?spm=a2700.details.0.0.4fcf2456OXjP0BYou can get in touch with the company that make them (They claim so, but, but younever know..), Matrix via this website:http://www.szmatrix.com/productinfo/335675.htmlMATRIX TECHNOLOGY INCtel 0086-755-2836 427386-0755-28364276sales@szmatrix.comNo. 206, Building D, Huachuangda Culture and Technology Industrial Park, Haihui Road, 49th Area, Bao'an District, Shenzhen, Guangdong, Chinakind regardsErik
R&S NGL200 current-overshoot? - Page 1
Forum section: electronics / testgear

author: fishwhispers
author_rank: Contributor
timestamp: September 06, 2021, 05:06:53 pm
content: Hi, are there any R&S NGL200 series owners out there who are able to confirm whether their psu has the current overshoot problem that Dave found when reviewing the NGA100?(Around the 24 min mark)The specs on the NGL201 look pretty great on paper for what I'm looking for, but a loosey-goosey constant current mode would be a deal breaker for me.Thanks!

author: fishwhispers
author_rank: Contributor
timestamp: September 06, 2021, 08:19:03 pm
content: According to the firmware release notes for the NGA100, it looks like R&S did address the overshoot issue in firmware version 2.006. I'm not sure if it's safe to assume that the problem is fixed in all models though.

author: helgel
author_rank: Newbie
timestamp: September 07, 2021, 05:25:36 am
content: There is an extensive review of the NGM200 (I believe it's the big brother of NGL) here:https://goughlui.com/2019/08/20/launch-day-review-rohde-schwarz-ngm202-power-supply-overview/. With a full section on performance, including constant current overshoot:https://goughlui.com/2019/08/20/rs-ngm202-in-depth-ch5-instrument-performance-testing/. You might find some relevant info there.

author: fishwhispers
author_rank: Contributor
timestamp: September 07, 2021, 06:59:06 am
content: Oh perfect! Thanks for the link!Yeah it looks like the overshoot is still alive and well, at least when this review was posted. What a shame.
Affordable micro-grabbers - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: September 02, 2021, 03:20:16 pm
content: I'm sure the Pomona 72902 test kit is excellent but at £250 plus VAT it ought to be!!!Does anyone know of a source for similar micro grabbers at a less eye-watering price?The older Tek and HP ones are too large.ThanksDavid

author: Fungus
author_rank: Super Contributor
timestamp: September 02, 2021, 03:49:07 pm
content: $20 should get you a lifetime supply:https://www.aliexpress.com/wholesale?SearchText=micro+grabbers

author: bingo600
author_rank: Super Contributor
timestamp: September 02, 2021, 03:55:57 pm
content: Do NOT get thesehttps://www.aliexpress.com/item/32924136849.htmlThe metal clip part slips off the "subject leg"/Bingo

author: Markus2801A
author_rank: Regular Contributor
timestamp: September 02, 2021, 03:56:42 pm
content: I ordered "SDK08", arrived today :-)https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20210902075510&SearchText=SDK08

author: kripton2035
author_rank: Super Contributor
timestamp: September 02, 2021, 05:19:02 pm
content: the SDK08 are nice, and very small. may be too small for some DIP pins. ok for SO or even TSSOP.

author: JimKnopf
author_rank: Frequent Contributor
timestamp: September 02, 2021, 08:37:59 pm
content: I use EZ-HOOK XKM-S.

author: LaurentR
author_rank: Frequent Contributor
timestamp: September 03, 2021, 12:03:36 am
content: There are lots of NOS Tek grabbers on EBay like these ones:https://www.ebay.com/itm/234094788223I bought myself a bag and I am indeed set forever. You can find a better price than the link above with some patience (I have seen ~$20 a bag).

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: September 03, 2021, 09:33:47 am
content: You can find old MJ-033 clips on EBay. The hooks are strong and have smooth operation. Otherwise, Pomona or EZ Hook. Stay away from the cheap ones.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: September 03, 2021, 08:14:09 pm
content: I was impressed by the "SDK08" and ordered some too.

author: thm_w
author_rank: Super Contributor
timestamp: September 03, 2021, 09:41:30 pm
content: SDK08 are great if we are talking about SMD pin usage. I used them side by side on a TSSOP.Managed to destroy one, partially my own fault, pushed the back pin in too hard I think.If you are in canada the cost is a bit lower here:https://www.banggood.com/10Pcs-SDK08-Test-Clip-SMD-Grippers-Test-Clips-Ultra-Small-Clip-Foot-Clip-Micro-Chip-Online-Burning-Clip-p-1823454.html

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2021, 01:17:11 am
content: Quote from: LaurentR on September 03, 2021, 12:03:36 amYep them Tek ones are great but a little hard to find cheap or in small lots however not by having identifying attributes they need be connected to colored fly leads for channel ID.Otherwise these seem reasonable:https://www.ebay.com/itm/Goupchn-Mini-Grabber-SMD-IC-Test-Hook-Clip-Jumper-Probe-for-Logical-Analyzer/133521515268
[SOLVED] Brymen BM869s/BM789 mA range CREST problem - Page 1
Forum section: electronics / testgear

author: khr
author_rank: Newbie
timestamp: September 03, 2021, 10:32:25 am
content: Hi,I don't undestand the specs or something is terrible wrong. Can someone point me what i am doing wrong?I own 2x BM869s and BM789. All the have the same "problem".PROCEDURE:1. Switch to mA range and put some small current eg 1mA2. Meter will display the correct value.3. Press CREST button. Now the value in CREST jump to ~4mA.WTF?If i try measure 1mA on uA range and press CREST all is fine. Value is off just few %.Why there is so big offset for small currents on mA range (when using CREST function)?Both my 3 meters do the same. Just offset is different.eg. for 100uA in CREST it measure 3.7mA :/

author: HKJ
author_rank: Super Contributor
timestamp: September 03, 2021, 11:08:31 am
content: The CREST function uses a special circuit to measure fast pulses. This circuit has lower precision and much larger offset (+/- 100 count) than the standard measurement circuit.

author: khr
author_rank: Newbie
timestamp: September 03, 2021, 11:17:27 am
content: Hmm so on mA DC range CREST can be +/- 10mA off and stil all with spec?

author: Fungus
author_rank: Super Contributor
timestamp: September 03, 2021, 11:22:39 am
content: The spec says this:And it's not very different from the Fluke 87V:Bottom line: Don't use "crest" mode unless youreally arelooking for very short events.

author: HKJ
author_rank: Super Contributor
timestamp: September 03, 2021, 11:25:45 am
content: Quote from: khr on September 03, 2021, 11:17:27 amOn a range with 0.1mA resolution: yesAnd be careful to to confuse CREST (Peak) with min/max (REC on Brymen). The min/max function usually has about the standard precision and is more than 100 times slower than CREST.

author: khr
author_rank: Newbie
timestamp: September 03, 2021, 11:33:21 am
content: This change of resolution in CREST is pretty confusing. Fluke 87V also have +/- 100 counts in PEAK mode but at least don't change resolution.Thanks anyway.
How to Extract Data from the Binary File of Siglent Oscilloscope - Page 1
Forum section: electronics / testgear

author: tv84
author_rank: Super Contributor
timestamp: September 04, 2021, 07:56:37 am
content: How to Extract Data from the Binary File of Siglent OscilloscopeTaken recently from Siglent site.Just for reference because many guys here search for this type of info.

author: tautech
author_rank: Super Contributor
timestamp: September 04, 2021, 08:42:26 am
content: RTFM.

author: tv84
author_rank: Super Contributor
timestamp: September 04, 2021, 09:44:01 am
content: Quote from: tautech on September 04, 2021, 08:42:26 am

author: 2N3055
author_rank: Super Contributor
timestamp: September 04, 2021, 11:22:59 am
content: Quote from: tautech on September 04, 2021, 08:42:26 amUser manual for scopes only mentions BIN2CSV utility and mechanics of BIN files on scope.This document details BIN file format for people that would want to parse it directly. It is a separate document.To be honest, it was added to documentation list on the web sites for every scope only recently... It existed before but placed so obviously. If you searched for it, it was there.Speaking of, I like new website format better (all documents relevant to my scope together). They are improving by the day.. Nice.I think it is nice from tv84 to make it more accessible and public. I also agree with him that many people here asked that same question..In a way, tv84s post is also "sort of RTFM" but also giving the document in question to go with that statement. My reaction: thanks buddy, very nice of you...Even if I didn't need that information and/or already knew it, it doesn't detract from his gesture being nice.So, again, thanks amigo, and don't worry, Rob is just being grumpy...He's a nice guy really, despite being a bit "direct" at times.Best to bothofya..
Wavetek 2001 Sweep Generator for Return Loss Testing - Page 1
Forum section: electronics / testgear

author: spongella
author_rank: Contributor
timestamp: September 03, 2021, 11:22:58 am
content: Wonder if anyone has/had a Wavetek 2001 sweep generator? I recently purchased one to use along with a HP8591 spectrum analyzer for checking return loss on some of my antennas and filters I've contemplated buying a new spectrum analyzer with a built-in tracking generator but am holding off as I like the older equipment. I am very pleased with the Wavetek, it covers a wide frequency range and has an excellent manual. Thanks for reading.
DAQ tool - where to buy - Page 1
Forum section: electronics / testgear

author: hcglitte
author_rank: Regular Contributor
timestamp: September 02, 2021, 11:52:15 am
content: Hi,I am looking for a "simple" DAQ tool which can accept a 16 bit digital parallell input (data) and with a CLK input which captures data on clock edge.The DAQ should also have a counter which increments for each sample point.The DAQ tool should have a USB port and PC software which logs the data in a simple text file with "counter value, data value".The DAQ should handle a sample rate of about 1 Mega samples per second.Is there any such tools available?Perhaps FTDI has some plug and play chips for this type of requirement?Or perhaps normal logic analyzers can be set up to handle this.HC

author: voltsandjolts
author_rank: Unknown
timestamp: September 02, 2021, 12:21:48 pm
content: Sounds like you are looking for a logic analyser with state analysis (external clock) capability.But maybe a standard logic analyser would suffice.Cheapest option is to use sigrok PulseView and the little cypress usb chips.You can write your own decoder in Python if you wish.https://learn.sparkfun.com/tutorials/using-the-usb-logic-analyzer-with-sigrok-pulseviewhttps://www.sigrok.org/wiki/Supported_hardware#Logic_analyzershttps://www.ebay.co.uk/itm/363453946784
Cheap USB current/voltage monitor (UM24c) issues.  Does not retain data - Page 1
Forum section: electronics / testgear

author: TT_Vert
author_rank: Regular Contributor
timestamp: September 01, 2021, 10:34:50 pm
content: I searched and even tried to send the dev a PM (He cannot receive them) so I figured i'd post here.I've run into an issue that may have been there since day 1 but i am unsure. When i have it in data slot 1-8 9 times out of ten it will not retain the data upon power cycle. And when it does (rarely) it only retains the Capacity and not Energy data. I have tried to see if there was a way to make it fail or work consistently and I've had no luck. I try to stop the recording before disconnecting, I've tried to unplug the load before powering off, etc. I also notice that many times even the data slot 0 won't retain the data upon reboot. I do know it overwrites the second recording is started but it rarely even saves that.Any input?ThanksDave
Aneng takes the smartphone analogy too far? (ANENG 620A) - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: February 27, 2021, 05:15:10 am
content: Even the on/off switch is like a phone's on/off switch and the function select buttons are where a smartphone volume buttons would be:https://www.aliexpress.com/item/1005002124657734.html

author: james_s
author_rank: Super Contributor
timestamp: February 27, 2021, 05:19:01 am
content: Well I wouldn't want one, but I guess the market will decide.

author: GrayCat
author_rank: Contributor
timestamp: March 13, 2021, 03:08:29 pm
content: So, it' the " ANENG 620A " model. Just to make this topic searchableThe main question is: does it have therealmode switching? Their previous model 619A has an awful "Smart" mode, auto-switching between Volts, Ohms and continuity -- so you can NOT measure small voltages, neither small resistances. I expect Aneng to return to the manual mode switching.

author: Fungus
author_rank: Super Contributor
timestamp: March 13, 2021, 03:22:37 pm
content: Quote from: GrayCat on March 13, 2021, 03:08:29 pmI changed the title.Quote from: GrayCat on March 13, 2021, 03:08:29 pmIn the video you see both "Auto" mode and fixed modes (eg. when testing the LEDs).The ranges are shown on the Aliexpress page:I think this meter is for casual users. If you're really interested in fine measurements there are much better ones (eg. Aneng 870).

author: TimFox
author_rank: Super Contributor
timestamp: March 13, 2021, 04:54:16 pm
content: In the still image shown above, two normal test probes are connected to a capacitor, but the readout is temperature in Celsius.

author: wraper
author_rank: Unknown
timestamp: March 13, 2021, 04:56:40 pm
content: Quote from: TimFox on March 13, 2021, 04:54:16 pmSo what? Measurement is displayed on top. Due to large capacitance, measurement was displayed after a few seconds.

author: Fungus
author_rank: Super Contributor
timestamp: March 13, 2021, 05:23:11 pm
content: Quote from: TimFox on March 13, 2021, 04:54:16 pmThe bottom half of the screen always shows temperature (the room temperature).The capacitance result will appear in the top half of the screen when it's finished reading.

author: TimFox
author_rank: Super Contributor
timestamp: March 13, 2021, 05:25:25 pm
content: That dispels my mistake: I never view these videos.

author: GrayCat
author_rank: Contributor
timestamp: September 01, 2021, 02:03:09 pm
content: So, according to some YouTubes, this meter only has the "Smart" mode for V/R/continuity. You can not measure voltages below 0.5V, and resistances below ~~30 Ohm with it.==> Trash Can.The next my favourite will be the "Habotest HT116" == "GVDA GD128" multimeter. It has a slightly smaller (3.5 inch) but "Semi-Colour"VAdisplay. And YES, it can be switched tomanualV/R/Cont. modes, along with Auto/Manual ranges!
Analog multimeter calibration / schematic (Dick Smith Q-1136)  - Page 1
Forum section: electronics / testgear

author: de_light
author_rank: Regular Contributor
timestamp: September 01, 2021, 10:55:23 am
content: Picked up a Dick Smith Q-1136 analog meter at a boot sale. Calibration on the voltmeter isn't accurate. Previous owner has also soldered in a 18650 as a battery replacement.Does anyone have a schematic for this device or know of a calibration procedure for it?

author: tszaboo
author_rank: Super Contributor
timestamp: September 01, 2021, 12:05:31 pm
content: Just turn the knob below the screen until 0 is 0?

author: Circlotron
author_rank: Super Contributor
timestamp: September 01, 2021, 12:12:30 pm
content: Post a pic of the insides. Likely it's been sold under a number of brand names and someone might recognise it.
E4411B vs 8591C - Page 1
Forum section: electronics / testgear

author: veedub565
author_rank: Frequent Contributor
timestamp: September 02, 2021, 07:33:12 pm
content: I currently have both of these spectrum analysersAgilent E4411B ESA-L, 50ohm, 9khz - 1.5GHz, no optionsHP 8591C, 75ohm, 1MHz - 1.8GHz, Tracking generator, and narrow bandwidth option.I'm thinking of letting one go and keeping other, but which one to keep ?I'm leaning towards keeping the 8591C, yes it is old, has BNC's rather than N-Types, and 75ohm (although 50ohm can be selected in the menu). On the upside it does have a tracking generator and narrow bandwidth option.The ESA is newer, but it is pretty basic, and I'm not sure it's built as well as the older HP analyser.Of course I could get rid of both and buy something else with the proceeds ?

author: rvalente
author_rank: Frequent Contributor
timestamp: September 02, 2021, 08:30:31 pm
content: First thing people will ask you here:What are your needs?What do you do with them?The 8591C being 75ohms and not 50 is not a problem for you? The impedance matcher does not bother you?

author: veedub565
author_rank: Frequent Contributor
timestamp: September 03, 2021, 06:33:36 am
content: They are just used for general purpose at the moment, and maybe some HF/VHF HAM radio work.50ohm can be selected in the menu, I don't think this changes the physical termination. Rather it calculates the correct reading for 50ohm.I was just curious to see what people thought of these two analysers and which was a better one to keep.
KP184 time current curves (melting fuse time curves)    - Page 1
Forum section: electronics / testgear

author: Sharp
author_rank: Contributor
timestamp: August 15, 2021, 07:16:25 pm
content: Hi GuysI have a KP184 and need to verify the current accuracy for some PCB fuses.I have only used the KP184 a couple of times, and only used the load testing, using the constant current function.I need to do a couple of “time current curves” (melting fuse time curves) with constant current load over time.Any suggest to how I approach this task ?

author: Kean
author_rank: Unknown
timestamp: August 16, 2021, 06:04:59 pm
content: Take a look at TestController which supports the KP184https://lygte-info.dk/project/TestControllerIntro%20UK.htmlDiscussion thread herehttps://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

author: Sharp
author_rank: Contributor
timestamp: August 31, 2021, 02:47:34 pm
content: Thank you Kean
Brüel & Kjaer scale wanted - SA 0259 - anyone? - Page 1
Forum section: electronics / testgear

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: August 29, 2021, 08:46:10 pm
content: Good day my fellow test equipment aficionados,I am looking for a scan of a scale for a measurement amplifier from Brüel & Kjaer.The scale is a linear scale, type "SA 0259".This is for a type 2636 measurement amplifier made by Brüel & Kjaer.I am happy to pay a reasonable price for a good quality scan of the scale, so I can finish my adjustment after a successful repair. Please send me a PM.Thanks in anticipation!Cheers,THDplusN_bad

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 30, 2021, 07:48:46 am
content: Ok ... let's see what I can find

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: August 30, 2021, 09:34:27 am
content: Thank you very much, Henrik. I have sent you a PM.Cheers,THDplusN_bad

author: Inside21
author_rank: Contributor
timestamp: August 30, 2021, 06:58:36 pm
content: have:SA0038SA0039SA0052SA0053SA0055SA0056SA0057SA0058SA0059SA0086SA0087 (Linear 0-100)SA0156SA0157SA0175SA0176+ Empty scalefor quick work i may scan this scales at resolution 600 dpi, 24 bit colourand if you print scale on paper - it`s be nice view

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: August 31, 2021, 10:36:33 am
content: Thanks for your kind offer, inside21 - see my PM for details.Another EE has kindly helped me with the SA0259 scale,so this is no longer an active request.Kind regards,THDplusN_bad
GW Instek GPD-3303S Fan replacement  - Page 1
Forum section: electronics / testgear

author: sequoia
author_rank: Unknown
timestamp: February 01, 2017, 08:34:10 am
content: Scored one of these from eBay (apparently liquidated stock from ITT Tech). PSU seems to work fine and calibration seemed to be spot on (have to still verify if the CH3 has that overshoot when turning output on...)Only problem is than fan bearing is going out and it's making annoying noise.Quick look inside and fan seems standard 80mm x 80mm x 25mm computer fan (as it has 4 leads), but schematics imply that two pins are for power and the other two control speed as there appears to be two 20K thermistors in parellel connected across the other two pins. So not "standard" PWM fan used on PCs (?)Service manual lists fan as:* FAN MGA8024MR-025, DL24V, 80*80*25, MS, P, CESo it not 12V fan (and not PWM), so simply replacing fan with inexpensive (and quiet) PC fan doesn't seem to be an option...Is this type fan standard (where fan speed appears to be proportional to resistance over the two control pins/leads)?Does anyone have ideas where to get suitable replacement fan?

author: nctnico
author_rank: Super Contributor
timestamp: February 01, 2017, 11:14:09 am
content: Did you try to put the number on the fan (not the one in the service manual) into Google? That usually leads to shops where they sell it.

author: sequoia
author_rank: Unknown
timestamp: February 05, 2017, 09:04:18 am
content: Actual fan in my unit was made by Younglin Tech. Model DFB802512H. (DC12V 2.0W)This fan contains circuitry to control RPMs based on thermistor connected across two control leads. PSU has two 20k thermistors (one under each heat sink) in parellel configuration, and fan seems to expect 10k thermistor across the control leads.I got an idea to build small adapter that plugs into the fan connector on the main PCB and and has connector for standard (PC) 12V PWM fan.I had Adafruit Trinket (5V) laying around and it has just enough I/O pins to handle this.I used pin 0 (digital input) to read the pulses coming from PWM fan speed (tachometer) pin, and pin 2 (analog input) to read the thermistor.For output I used pin 3 (digital output) as serial (TTL) output to be able to monitor fan speed/temperature for debugging purposes and pin 4 (digital output) to generate 25kHz PWM signal to control the fan speed.I put in nice (quiet) 80mm PC CPU fan (Noctua NF-A8) and cant believe how quiet this thing is nowI'm running fan at about 600rpm when heatsinks are in room temperature and then linearly adjust fan speed to maximum when heatsink temperature rises....

author: Kalcifer
author_rank: Regular Contributor
timestamp: August 31, 2021, 10:36:33 pm
content: Strangely enough, I just connected a noctua fan directly to the header and it works. Although it probably is not following any fan curve, just full speed.