hybridfree/eevblog-posts huggingface dataset:
Test/review of DMM/Clamp UNI-T UT210E - Page 1
Forum section: electronics / testgear

author: HKJ
author_rank: Super Contributor
timestamp: September 09, 2017, 04:06:07 pm
content: For the full review see:http://lygte-info.dk/review/DMMUNI-TUT210E%20UK.htmlVolt and frequencyAC volt can measure up to about 2kHz (RMS will not work at the frequency).AC volt with VFC reduces bandwidth to 400Hz and limits range to 200.0V & 600VAll ranges starts on ACInput impedance is 10Mohm to 11Mohm on AC and DCBuzzer sounds on over voltage (600V)CurrentBuzzer sounds on over current (100A).All ranges starts on ACAs usual clamp meters are not very precise and at 0.5A and 5A it was about 2% out.Ohm, Continuity, diode and capacityOhm is 1V open and 0.33mA shortedContinuity is fast (Below 4ms).Continuity beeps when resistance is below 50ohm.Continuity is 1V open and 0.33mA shortedDiode range uses 3.3V, max. display is 2.2V at 0.5mA, max. current is 1.4mA shorted11000uF takes about 9 seconds to measure.MiscellaneousCurrent consumption of meter is 7.2mA (13.2mA with backlight) in current modeCurrent consumption of meter is about 1.7mA (7.7mA with backlight) in other modes.Meter works down to 2.2V where it turns off, battery symbol show at 2.5V.Backlight only works down to about 2.6V where it is fairly dim.Both current and voltage readings are stable with changing battery voltage.The meter usual need a couple of display update to reach the final value.Viewing angle is good.Display updates around 3 times/secBacklight will automatic turn off in about 15 seconds.Will automatic turn power off in about 15 minutes.Weight is 174g without accessories, but with batteries.Size is 174 x 62 x 32mmProbes & clampProbe resistance 37mOhm for one.Probe wire is 90cm long.Clamp can handle up to ø17mmConclusionThis meter is nice for measuring 100's of mA or more without any voltage drop, using it for lower DC currents requires careful use of the zero button.It has basic DMM functions, but it missing frequency and low currents.It looks like it has real input protection and the CAT rating may be correct.

author: don.r
author_rank: Frequent Contributor
timestamp: September 09, 2017, 04:35:33 pm
content: Very nice for a sub $20 clamp meter. UNI-T is definitely improving some of their low-end products nicely.

author: H.O
author_rank: Frequent Contributor
timestamp: September 09, 2017, 04:44:17 pm
content: For more interesting reading about this meter see this17 pages long thread.
Temperature advice and a new hot air station - Page 1
Forum section: electronics / testgear

author: robgerr
author_rank: Contributor
timestamp: September 03, 2017, 02:04:50 pm
content: Hi to all friends of the forum. I would like some advice on purchasing a new hot air welding station. I currently have an atten 8586, I found it discreetly well but would like some opinion about the temperatures for soldering QFN. Currently dissolve at 420 ° c and balance at 390 ° c (bath pads with leades lead)Do you think it's a temperature or a risk? I would use the same temperature to replace ic from iphone.Do you have any advice on some hakko hot air pattern? I see louis rossman using a fr-801 where it does not know that temperature sets it so it is an analogue device.Thank you

author: robgerr
author_rank: Contributor
timestamp: September 04, 2017, 12:24:55 pm
content: up

author: Magnum
author_rank: Regular Contributor
timestamp: September 04, 2017, 12:57:54 pm
content: If you are looking for a good station, take the Ersa i-con Vario 2 or Vario 4. The handpiece is really small and the temperature spot on. The airflow can be regulated at the handpiece.http://www.kurtzersa.com/electronics-production-equipment/soldering-tools-accessories/soldering-desoldering-stations/produkt-details/i-con-vario-2-1.html

author: nctnico
author_rank: Super Contributor
timestamp: September 05, 2017, 08:07:51 am
content: 420 deg C sounds way too high. I have my Atten 858D+ set at 330 deg C for soldering work. What works well for me is keeping a distance of 2 to 3 cm from the components otherwise the airflow gets blocked too much and the component won't get hot.

author: 2N3055
author_rank: Super Contributor
timestamp: September 05, 2017, 09:00:42 am
content: If you need such a high temp, you probably need to use preheater... In which case you Atten might prove adequate...Also maybe your Atten might show temp wrong, you should measure output temp with separate thermometer...

author: nctnico
author_rank: Super Contributor
timestamp: September 05, 2017, 09:33:18 am
content: Accurate temperature from a hot air station is very subjective because as soon as the air leaves the nozzle it will mix with the surrounding air.

author: DTJ
author_rank: Super Contributor
timestamp: September 05, 2017, 10:59:11 am
content: Get the atten 858 and buy an cheap hot plate as a preheated.put a slab of aluminium plate on the hot plate to distribute the temp evenly.https://www.google.com.au/search?safe=off&client=tablet-android-lenovo&biw=1280&bih=800&tbm=isch&sa=1&ei=9IKuWZ7AA6LT0gKC2bCADg&q=+single+hotplate&oq=+single+hotplate&gs_l=mobile-gws-img.3..0i13k1l2j0i13i5i30k1j0i8i13i30k1.20791.20985.0.22073.5.2.0.0.0.0.449.814.3
Change scantime PowervsTime CMU200 - Page 1
Forum section: electronics / testgear

author: MaartenH
author_rank: Newbie
timestamp: September 04, 2017, 05:24:34 pm
content: I need to do some transmitter On/Off switching experiments with my CMU200. In the Power vs Time mode the scantime is fixed to 100uS. I need more something like 50mS, how can I change this ?
8753E with APC-7 test port parts missing - where to get them? - Page 1
Forum section: electronics / testgear

author: sk2x
author_rank: Newbie
timestamp: September 04, 2017, 09:36:00 pm
content: Greetings VNA fans. Here is mystery...I acquired this very clean 8753E option 6 with test port outer APC-7 shell and other connector parts missing. The couplers seem fine.Otherwise the analyzer appears to be in good shape. I can manually connect a wire to the center pins and get reasonable responses on the display. I have no idea why someone would remove these parts, unless they had been damaged or perhaps were cannibalized to fix another unit.Anyone out there have a suggestion on what to do? It's a nice analyzer but not to useful without test ports!Thank you!FYI, I also posted this question over on the Keysight VNA forum:https://community.keysight.com/thread/26470

author: sk2x
author_rank: Newbie
timestamp: September 05, 2017, 12:19:56 am
content: Update:I could not resist further disassembly and inspection. I found that the input coupler has threads that accepts a 3.5 mm/SMA female, but the center conductor is considerably smaller than normal SMA.My dream would be a connector that mates to the input coupler and gives me a 6 GHz-capable type N (and goodbye APC-7)!Anyone know the correct connector type that mates directly with the 8753 input coupler?Thanks!
IFR 1200S Attenuator Repair / Replacement - Page 1
Forum section: electronics / testgear

author: lacommtech
author_rank: Newbie
timestamp: September 04, 2017, 02:49:09 pm
content: I've searched here and elsewhere and read a number of very fine postings about IFR service monitors, but none seem to deal with this specific issue. I apologize in advance if I overlooked something.My IFR 1200S has developed a problem with the attenuator. I suspect that it needs cleaning or replacement as it is intermittent and only impacts the lower range. Unfortunately, I won't have the chance to pull the cover off until next weekend so I don't know whether it has the JFW or Telonic Berkeley attenuator, although the serial number is above 8500 if that means anything.I do have the service manual and from the exploded parts view of the front panel, videos of other repairs, etc., it doesn't look too hard to pull the attenuator. However, I have heard that there can be problems getting the gearing right upon reassembly. I have read passing comments about how some people have made some type of a jig or device to deal with this, but no specifics.My questions:1. Can anyone who has removed and replaced the attenuator advise how they dealt with the gear issue?2. Has anyone cleaned the attenuator and what is the process?I know that replacement attenuators are available fromhttp://www.kgelectronics.com/and that they even have an exchange program for the JFW type. Since I'm in the US, I might send the 1200S to them and have a calibration done at the same time. However, given the turn-around and shipping time, that would probably take 4-6 weeks, so if I can swap out the attenuator -- or even clean it -- that would be preferable.Thanks in advance for any comments / suggestions.
Amtrue ZTP1203B - Page 1
Forum section: electronics / testgear

author: kcs
author_rank: Regular Contributor
timestamp: September 02, 2017, 09:12:39 pm
content: I have recently picked up aPolar SMPSU, but was not too happy about it. This time I have boughtZTP1203B. I have made a few closeup photos and I have scanned its user guide.

author: kcs
author_rank: Regular Contributor
timestamp: September 02, 2017, 09:13:47 pm
content: More photos and the user guide.
Is it worth saving? - Page 1
Forum section: electronics / testgear

author: CatalinaWOW
author_rank: Super Contributor
timestamp: September 03, 2017, 06:06:26 pm
content: I acquired a bunch of oscilloscopes a while ago, some of which were totally unrepairable. One was a Tektronix 455 which was missing several boards, several knobs and was literally a bucket of parts. So now I got around to piecing it out, saving the things that might be useful to someone to repair their gem. I come to the high voltage module. A quick web search shows a lot of interest in the module, with little or no supply, so I desolder it. Not a lot of information on the part itself, but between the schematics for the scope and the connections on the board you can figure it pretty well out. A layout for the module along with the internals copied from the schematic are attached. A small contribution to the body of knowledge.Checks indicate that the diode connected to pin 5 is likely blown open. The question is: Is it worth digging into the potting on the module to try to repair this. Would anyone want this after such a repair? Or does anyone else want to give this a go?As an aside, anyone interested in other parts out of the 455 can PM me. I am sure we can arrange something.

author: tautech
author_rank: Super Contributor
timestamp: September 03, 2017, 08:55:28 pm
content: Quote from: CatalinaWOW on September 03, 2017, 06:06:26 pmIt could be worth trying as the diode apparently connects between pins 5 and 6 near the 5 o'clock position in your image. It's quite likely there's little else there to be in the way.But only those with access to X-ray imagery might be keen to give it a try.
on board power supply issue of LeCroy SDA 6020 scope - Page 1
Forum section: electronics / testgear

author: xbaby
author_rank: Contributor
timestamp: August 15, 2017, 10:38:26 am
content: hi, forum.As described in another thread, this scope has big hardware issue. I have fully removed the motherboard from the scope to further check it and try to repair ...there are four 48v input DC-DC converters on board, which provide voltages to ADC modules. These power supply bricks look like standard 1/4 brick, with size of 57mm * 38mm, but there are no model marking on them.The DC-DC #2 has abnormal output voltage, only 0.3 to 0.4v, which should be -3.3v as compared with another working WP 7300A scope. DC-DC #4 was dissoldered before by unknown guys, it's the status when I purchased this scope. I believe the normal output voltage of DCDC4 should be +3.3v.

author: xbaby
author_rank: Contributor
timestamp: August 15, 2017, 12:35:18 pm
content: My current plan is to firstly replace the DCDC4. I have already found some DC-DC modules with compatible mechanical dimensions and pinmap. There are two types, one is 3.3v 20A, another is 3.3v 40A. My estimation is the 40A model was more suitable. I'd like to ask your suggestions about which to choose, 20A or 40A? Is there anything others I need to be careful? Thanks.

author: xbaby
author_rank: Contributor
timestamp: September 02, 2017, 04:06:30 pm
content: this scope was fully restored after I replaced the DCDC2 (with a 20A model) and DCDC4 (with a 40A model). right now it is working, no other issues found yet,

author: nctnico
author_rank: Super Contributor
timestamp: September 02, 2017, 04:22:12 pm
content: That is good news. I always find it interesting to finish repairs which in the end didn't take going much further to get something fixed.

author: xbaby
author_rank: Contributor
timestamp: September 02, 2017, 04:45:34 pm
content: just a quick test find a minor problem of front-end module of Channel #2, as shown in the picture, the CH2 front-end module appearance is different with other channels, looks like a newer revision.the problem is the zero input noise is higher than other channels. it's about 600uv rms at full 6GHz bandwidth (measured at 2mv/div, 50nv/div), compared with about 450uv on all other channels.I guess this scope had Ch2 front-end module and also the acquisition motherboard replaced before, so the serial number read by xstream is different with the sticker on the back-panel.

author: xbaby
author_rank: Contributor
timestamp: September 02, 2017, 05:02:36 pm
content: this picture shows the comparison of CH2 noise with CH4, at same condition.
countefeit multimeters! - Page 1
Forum section: electronics / testgear

author: TheNewLab
author_rank: Frequent Contributor
timestamp: September 02, 2017, 02:16:18 am
content: Hey, here's some photos of a Uni-T (china only) that has silkscreened the Brymen and EEVBlog label.Note the generic test probes and a fake fluke style K type probe.I added the DIY Meter hanger out a piece of leather plus a key ring

author: TheNewLab
author_rank: Frequent Contributor
timestamp: September 02, 2017, 02:19:09 am
content: just go towww.123labels.com, or is itwww.abclabels.comthey also silkscreen. have to contact and ask for quote
How update the ESR-T4 - Page 1
Forum section: electronics / testgear

author: Andbro
author_rank: Regular Contributor
timestamp: September 01, 2017, 08:04:06 pm
content: Hello,I have bought a Chinese ESR-T4 and I want to update the firmware to 1.12K.Do you can explain how to update? I don't know which software choice and what must I do with eep and hexadecimal files. I have an usbasp...Thanks
Small budget current probe - Page 1
Forum section: electronics / testgear

author: anishkgt
author_rank: Frequent Contributor
timestamp: August 31, 2017, 11:41:38 am
content: So after a while working with mini projects I am bringing to get the feeling that I should have a current probe.I found this in eBayhttps://www.ebay.com/itm/172452659846How good are these at 62$ ?Www.Georgehobby.wordpress.comEquipments: DSO104z, Hakko FX888D

author: tautech
author_rank: Super Contributor
timestamp: August 31, 2017, 11:49:27 am
content: 20 KHz BW is very limiting, you should look for something with at least 100 KHz.Pintek PA-622 or 655 would be better BW choice.

author: OldDogSleeping
author_rank: Contributor
timestamp: September 01, 2017, 02:33:01 pm
content: I have one, and it works fine for my needs.I use it when setting up stepper motor drivers. The limited BW and tendency to drift are not really a problem for me.

author: Fungus
author_rank: Super Contributor
timestamp: September 01, 2017, 03:41:17 pm
content: A simple shunt resistor might do the job, too.

author: joeqsmith
author_rank: Super Contributor
timestamp: September 01, 2017, 03:49:55 pm
content: I have never used the one you link to but would say like any equipment, depends what you need. For me, there is no one simple probe solution.For DC to 100MHz in the 1mA to 1A range, I have a very old Tektronix P6042 that I modified. Below 1MHz, these probes can handle 20Ap-p.If you are just a hobbyist, I see no reason you could not roll your own. It sounds like you may not even have a need for one yet and are just interested in playing with one. Maybe just wait a while. This video shows where I followed an article about using a split-core to make one. There is a link to the article in the description.I like the UNI-T UT210E as a general purpose clamp. The fact it can resolve down to 1mA makes it a no brainer for hunting automotive electrical problems. It can also measure up to 100A. I added an analog output to one just using a small buffer amp.The bandwidth on these is only a few KHz. But because they are so cheap, there was no reason not to take a crack at modifying one to up the response. This may be the highest BW UT210E on the planet. It took a fair amount of effort to come up with a workable design. For me anyway, designing and constructing things is what I enjoy doing with electronics.

author: Vtile
author_rank: Super Contributor
timestamp: September 01, 2017, 04:00:41 pm
content: I got one directly from Chine with wery low price. It definedly can not compete with Hameg equivalents I used in the past.I always worry it will just crumble in my hands, but considering how cheap it were <30€ I can not complain. It works in a way that it pass through a signal, but that it is all that can be said. Protection level (CAT or equivalent rating) can be considered near zero.
UT181A - Inquire Recording and time duration - how work ? - Page 1
Forum section: electronics / testgear

author: pavia.luigi
author_rank: Newbie
timestamp: August 29, 2017, 10:27:28 am
content: Good Morning guys.Someone can please try to explain how work the specific datalogger function named as "Inquire Recording"available inside the Uni-T UT181A multimeter ? Inside the user manual is not clear specified.I will try to understand if this function is comparable as the "EventRecord"of a HiEnd datalogger Fluke multimeters.and Also, during the video reviews available on youtube, regarding the datalog function at specific interval,i see that with a sample interval set with value of one second, the last indicator "Sample Duration" seems do not change,and the value indicated exceed the 9 days...How can be possible? the instrument have only 20000 sample possible.Please answer my question because we would buy one of this.Thanks a Lot.Luigi

author: ufi
author_rank: Newbie
timestamp: August 31, 2017, 03:14:13 pm
content: No long time to check, but I think:20000 - records for manual saved values10000 - records in continous mode with >800000 samples shared for all records.Best regards
Fluke 117 temperature - Page 1
Forum section: electronics / testgear

author: alentje
author_rank: Contributor
timestamp: January 20, 2014, 09:54:33 am
content: I don't want to buy a new multimeter but i need to measure temperature with it. I have a brand new Fluke 117. What temperature probe do i need? I saw these cheap k-type ones but these won't fit in my Common and positive port.. Is there any adapter for it? How is it called? And when i connect the k-type temp. probe, how do i read the temperature, is 10mV 10 degrees celcius? And does the probe need any power?Thanks,- alentje

author: Wytnucls
author_rank: Super Contributor
timestamp: January 20, 2014, 10:05:42 am
content: You need a meter with a dedicated temperature measurement function. The Fluke 117 won't do. The Fluke 116 has the feature you're looking for.http://en-us.fluke.com/products/digital-multimeters/fluke-116-digital-multimeter.html#fbid=jBPFDxM1Pen?techspecsTemperature²(Type-K thermocouple) Range/Resolution -40 °C to 400 °C / 0.1 °CAccuracy 1% + 10²Range/Resolution -40 °F to 752 °F / 0.2 °F

author: alentje
author_rank: Contributor
timestamp: January 20, 2014, 10:29:56 am
content: I heard any dmm would read temperature via the mV range

author: Wytnucls
author_rank: Super Contributor
timestamp: January 20, 2014, 10:35:16 am
content: It is possible, but then you have to purchase an adapter for your temperature probe, like this Extech gizmo:http://www.extech.com/instruments/resources/manuals/381277_um.pdf

author: han
author_rank: Frequent Contributor
timestamp: January 20, 2014, 11:55:21 am
content: any multimeter can read thermocouplebut the K type thermocuple coefficient about 41 µV/°Chttp://en.wikipedia.org/wiki/thermocoupleso the resolution is roughly 24 C/mV ..so if the minimum resolution is 1mV then you get the resolution about 24 C...if you budget tight you can make your own thermocouple tranducer, i make it with AD620 + DC-DC converter with +/- 15V out .so you can get 1 C/mV and put "C" sticker in the Voltmeter .i offset the cold junction by using LM35 (and 1 to 10 divider) to the reference pin , so the output will be absolute not relative..

author: Electro Detective
author_rank: Super Contributor
timestamp: August 31, 2017, 09:53:03 am
content: Buy a second meter that has temperature and supplies a K type probeIt does not have to be a Fluke or expensive, just a decent meter with that function and a good temp specTwo meters are better then one, always!If temperature measurement is your thing, consider a cheap IR lazer ray gun type thermometer tooThat's the way I roll, all bases covered
UNI-T UT-139C mA current measurement dead?! - Page 1
Forum section: electronics / testgear

author: info
author_rank: Contributor
timestamp: September 01, 2017, 06:06:30 pm
content: Hello there. I was testing the current capabilities of a "cheachimo" (cheap chinese module, a friend coined that one), I heard a "pop" from the multimeter when the device let out magic smoke and puked a boiled IC! It was one of those lm2577 lm2596 that are supposed to step up or down voltages. Now I opened it up and found a surface mount diode that was cracked. I have none at hand so I replaced it with a through-hole soldered onto the pads. It wasn't a schottky so I dumped a UF4007 there, closed it up again but no current measurement on the mA scale was possible. I checked the fuse, even bridged the fuse terminals temporarily with a piece of wire but still, no measurement possible. All other functions work, so I'm guessing the problem could be the ADC responsible for that current range or the shunt? I'm not sure where to start troubleshooting this one so if anyone has an idea I will appreciate it very much. I will update the post with photos/scans when I can asap.Thanks in advance

author: stj
author_rank: Super Contributor
timestamp: September 02, 2017, 08:19:31 pm
content: check the tracks, check the low-ohms pass resistor, check the rotary switch pads/contacts.next-time you test something that can pull a few A, use the 10A range!
New Rigol 4GHz Phoenix Scope at Electronex 2017 - Page 1
Forum section: electronics / testgear

author: snoopy
author_rank: Frequent Contributor
timestamp: August 26, 2017, 08:44:41 am
content: Just saw a brief write up in September edition of Silicon Chip magazine about the forth coming Rigol Phoenix Scope which will be on demo at Melbourne's Electronex electronics exhibition 6-7 September Melb Park Function Center. Not doubt the other scope players will have their flagship models there to compare it with. Should be quite interesting this yearcheers

author: EEVblog
author_rank: Unknown
timestamp: August 26, 2017, 10:36:51 am
content: Still deciding if I'll go this year... very busy at the moment.

author: snoopy
author_rank: Frequent Contributor
timestamp: August 26, 2017, 12:29:02 pm
content: Quote from: EEVblog on August 26, 2017, 10:36:51 amSend the young fellow over

author: pascal_sweden
author_rank: Super Contributor
timestamp: August 26, 2017, 06:23:42 pm
content: For those things, you just have to make time IMO.Every time I go to a fair, I discover something new or meet some interesting company.

author: John South
author_rank: Contributor
timestamp: August 29, 2017, 02:51:11 am
content: Hi All - First my apologies on the publishing of this info in Silicon Chip. We were trying to get a new scope in for the show but launch has been pushed back. Magazine deadlines being what they are we had to submit a press release some time ago prior to finding out we wouldn't have a sample of the new units for Electronex.I'd love to have one there but it is not to be. Again apologies on this.

author: snoopy
author_rank: Frequent Contributor
timestamp: August 29, 2017, 08:31:00 am
content: Quote from: John South on August 29, 2017, 02:51:11 amBummerAny ideas of the price of this thing ? Will this be the flagship range ?cheers
Test leads for mcb terminals - Page 1
Forum section: electronics / testgear

author: Starry
author_rank: Newbie
timestamp: August 21, 2017, 06:22:30 pm
content: Hey folks, does anybody know where i can purchase the pogo type test leads featured in this video at 0:48https://youtu.be/tG6gurqB93Qi have sent a message to ht, the publisher but received no awnser as yet. I like them because they seem to be able to grip the terminal hole while keeping contact with the screw.

author: JFJ
author_rank: Regular Contributor
timestamp: August 21, 2017, 08:42:13 pm
content: Quote from: Starry on August 21, 2017, 06:22:30 pmIt's possible that such leads do not exist - they may just be a bit of artistic license by the video maker. The leads appear to be simply dangling from the MCB screw holes, and were not inserted with any positive force.An illustration in one of the HT Instruments catalogues, shows the analyzer being used with more conventional test leads:

author: tooki
author_rank: Super Contributor
timestamp: August 22, 2017, 10:20:49 am
content: Indeed they are not connected with positive force (nor are they spring-loaded, which is what pogo means). But they're real, and they're magnetic. Here are Fluke's, for example:http://www.fluke.com/fluke/uken/accessories/test-leads-probes-and-clips/fluke-mp1-magnet-probe-1.htm?PID=80112

author: tooki
author_rank: Super Contributor
timestamp: August 22, 2017, 10:26:25 am
content: Chauvin Arnoux also seems to make some:https://youtu.be/lUYycSnrwDo

author: tooki
author_rank: Super Contributor
timestamp: August 22, 2017, 10:35:52 am
content: HT lists them as part 606-IECN (black only, it seems) on page 205 of their catalog:https://www.ht-instruments.com/en/catalogues/ht-instruments-general-catalogue/That said, I'm going to guess that the Fluke ones are gonna be the easiest to get.

author: Starry
author_rank: Newbie
timestamp: August 23, 2017, 01:18:50 am
content: Thanks everyone for the great information. Once have tried them ill be sure to report back on how well they work.Kind Regards.

author: tooki
author_rank: Super Contributor
timestamp: August 29, 2017, 08:57:03 am
content: Hey look what I just stumbled upon:https://www.reichelt.com/ch/en/Special-Accessories/2/index.html?ACTION=2&LA=3&GROUP=D1DA&GROUPID=7231&START=0&OFFSET=100&SHOW=1Filter by "magnetic adapter"
A DMM upto 20$ with PC connection for logging? - Page 1
Forum section: electronics / testgear

author: TomerP
author_rank: Newbie
timestamp: August 19, 2017, 04:33:03 pm
content: Hi, is there a DMM with a PC connection for logging (either USB/COM) that also costs less than 20$?

author: jpb
author_rank: Super Contributor
timestamp: August 19, 2017, 05:06:01 pm
content: It would probably need to be second hand if there was one.If accuracy is not that important then alternatives such as the analogue inputs on a rasberry pi might be an option.

author: Lightages
author_rank: Unknown
timestamp: August 19, 2017, 06:35:51 pm
content: The least expensive data logging meter that I know of is the Digitek DT-4000ZC, also known as TekPower TP4000ZC. They sell for around $40.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 19, 2017, 11:16:39 pm
content: Quote from: Lightages on August 19, 2017, 06:35:51 pmIt first sold for around $29 USD when I brought it to Martin's attention 5+ years ago. Then it got popular and sellers raised prices.http://www.mjlorton.com/forum/index.php?topic=81.0

author: Fungus
author_rank: Super Contributor
timestamp: August 21, 2017, 12:22:56 am
content: Quote from: TomerP on August 19, 2017, 04:33:03 pmWhat do you need to measure? How accurate?

author: TomerP
author_rank: Newbie
timestamp: August 28, 2017, 06:36:54 pm
content: Vdc and Current, as accurate as 1% I guess.

author: Fungus
author_rank: Super Contributor
timestamp: August 28, 2017, 06:49:34 pm
content: Quote from: TomerP on August 28, 2017, 06:36:54 pmHow many volts? How many amps? Will you need to switch voltage ranges or is it fixed?

author: TomerP
author_rank: Newbie
timestamp: August 28, 2017, 07:00:16 pm
content: 220v ac, much less dc, up to 30 amper (I don't know if its a reasonable requirement for that price range)

author: Fungus
author_rank: Super Contributor
timestamp: August 28, 2017, 07:45:46 pm
content: Quote from: TomerP on August 28, 2017, 07:00:16 pma) You don't really need to measure 220V AC, it hardly ever gives a wrong value (not unless you're using a generator or something).b) Look into current clamps for Arduino.https://encrypted.google.com/search?q=arduino+current+clamp

author: TomerP
author_rank: Newbie
timestamp: August 28, 2017, 08:45:15 pm
content: true, but measuring dc voltage of up to lets say 50v is something I'd like to be able to do with it

author: Fungus
author_rank: Super Contributor
timestamp: August 28, 2017, 08:53:19 pm
content: Quote from: TomerP on August 28, 2017, 08:45:15 pmMake a 10:1 resistor divider, connect it to the Arduino.
Hantek 5062 Bug Triggering falling edge ? - Page 1
Forum section: electronics / testgear

author: infosquadsn
author_rank: Newbie
timestamp: August 28, 2017, 05:35:16 pm
content: I am trying to trigger a Reset active low pulse from a functional Intel based mainboard with my Hantek DSO5062BMV. I set my scope to take a single sequence with falling edge trigger and sometimes i can get the 4ms (aprox) pulse but in most of my attemps my scope just cant see the falling edge.Sometimes i can get the pulse few times in a row, and sometimes i try 10 or 20 times and nothing happen.I tried with many ammounts of memory depth, with persistence and nothing works.Am i doing something wrong or it could be some bug with my scope ?I will attach a screenshoot from the mentioned pulse. Thanks in advance.
Need help on Oscilloscope Chart - Page 1
Forum section: electronics / testgear

author: fanOfeeDIY
author_rank: Unknown
timestamp: August 20, 2017, 04:19:11 pm
content: Hi,I need help on the Oscilloscope Chart which I started the thread athttps://www.eevblog.com/forum/testgear/digital-oscilloscope-comparison-chart/The last update was on April and it is getting outdated.I was revising this weekend, but can not finishing it, especially the column of the function gen.The link to the original google drive is here.https://docs.google.com/spreadsheets/d/1rtPqMAkNw2bSkqocuc7zcYkl57fsdPVlxzyqcJmbKIc/edit?usp=sharingI really really appreciate any help on the empty column of the function gen who has the model or fan of the brand.Adding the comments on the google drive or writing in this thread are perfectly fine. I will incorporate it the chart.Also any mistakes are greatly appreciated.I am Japanese and there is no culture of loosing my face so pointing me the mistake is good thing for me.Otherwise the word of "Kaizen" would not invented in Japan because "Kaizen" only starts and functions only if somebody speak out the problem.And I also not checking the Tektronix models recently.

author: tautech
author_rank: Super Contributor
timestamp: August 22, 2017, 10:19:30 pm
content: BUMP.fanOfeeDIYneeds impartial help to keep his sticky up to date.Anybody ?

author: fanOfeeDIY
author_rank: Unknown
timestamp: August 26, 2017, 12:39:32 pm
content: Hi,Thank you all for the valuable comments on the googledrive from Siglant, PicoScope, Lance Brieden, Hreggviður, Zafrullah and etc.I incorporated most of the comments to the chart.https://docs.google.com/spreadsheets/d/1rtPqMAkNw2bSkqocuc7zcYkl57fsdPVlxzyqcJmbKIc/edit?usp=sharingI will probably update the jpg files tomorrow afternoon in Japan time on the thread bellow.https://www.eevblog.com/forum/testgear/digital-oscilloscope-comparison-chart/And thank you for your support tautechThanks,

author: fanOfeeDIY
author_rank: Unknown
timestamp: August 27, 2017, 10:08:24 pm
content: The chart is updated after nearly 5 month.Happy to have many PicoScope in the charthttps://www.eevblog.com/forum/testgear/digital-oscilloscope-comparison-chart/Sent from my iPad using Tapatalk

author: Eric_S
author_rank: Regular Contributor
timestamp: August 28, 2017, 05:13:11 am
content: Hats off.You are really providing a great service to the community!

author: fanOfeeDIY
author_rank: Unknown
timestamp: August 28, 2017, 12:26:25 pm
content: Quote from: Eric_S on August 28, 2017, 05:13:11 amThank you!I spent reasonable time on this last week.
Troubleshooting my beautiful "new" tektronix type 422 oscilloscope - Page 1
Forum section: electronics / testgear

author: The Guy
author_rank: Regular Contributor
timestamp: August 26, 2017, 04:25:40 pm
content: Hello everyone!I just scored two awesome scopes, a tek type 547 AND a cute little type 422. Since I am quite a noob I started restoring the 422, I finished the cleaning process yesterday (looks tight!) but it developed a problem, the channel 2 is now sensitive to vibrations... i mean, if channel 2 is displaying a wave and I lightly tap with a nail anywhere on the scope's metal cover the wave distorts and deflects either up or down. I can make the wave go back to it's place by tapping the scope also.I'm thinking it's something loose inside or maybe dirty?I checked out visually the input amplifier from channel 2 and everything looks right. Can you point me a little what to look for? maybe do some chopsticking somewhere while the scope is running and displaying some waves?Thanks.Guy

author: xwarp
author_rank: Frequent Contributor
timestamp: August 26, 2017, 05:59:26 pm
content: You might want to clean the vertical gain pots. Those can get dirty. I have one of those with both the battery pack and the A/C supply.

author: The Guy
author_rank: Regular Contributor
timestamp: August 26, 2017, 06:11:25 pm
content: Quote from: xwarp on August 26, 2017, 05:59:26 pmIf those are the pots that go to the control knob those are already cleaned, but will look at it again.How do you like your 422? They're lovely

author: xwarp
author_rank: Frequent Contributor
timestamp: August 26, 2017, 06:17:36 pm
content: Apologies, I meant the step attenuation pots and gain pots.I don't use mine much.

author: The Guy
author_rank: Regular Contributor
timestamp: August 26, 2017, 09:46:13 pm
content: So, i corrected the problem.... pushed down to their sockets all the transistors and those little black capped brown thingies that look similar to the transistors, fired the scoop up and voilá...The problem now is that the voltages are high in the power supply test points except for the +12dc and -12vdc. I'm not sure how to correct those values.
HP 8935 Time Base Will Not Adjust - Page 1
Forum section: electronics / testgear

author: kiheiman
author_rank: Contributor
timestamp: August 26, 2017, 08:11:06 pm
content: I have just purchased a HP 8935 service monitor. Everything seems to check out good except the 10 MHz time base is 170 hz low. The DAC course voltage is at minimum value (0 volts), so I cannot adjust the frequency closer to 10 Mhz.There is no manual frequency adjustment on the CTS Knight 10 MHz module. The frequency is also not correct when I attach my 10 MHz GPSDO to the external clock port. I would have thought that the box would be right on frequency with the external clock, regardless of the status of the internal clock.Does anyone have any ideas on what is causing the problem. A quick replacement of the Reference Module might fix the problem, but the seller wants me to ship the entire box back to them.RegardsClint
Does this use a battery? - Page 1
Forum section: electronics / testgear

author: billbyrd1945
author_rank: Regular Contributor
timestamp: August 25, 2017, 01:19:15 am
content: This is my first post and I'm trying to include a pic. Hope it works. I bought this clamp on meter at an estate sale. The voltage reads out but the current doesn't. I opened it up and didn't see any where for a battery. I can't find any answers any where about whether it needs one. Can you help. Thanks.https://www.dropbox.com/home?preview=clampon.jpg

author: Andy Watson
author_rank: Super Contributor
timestamp: August 25, 2017, 01:26:23 am
content: No battery required. How did you test the amps range?Note it will only respond to A.C. amps.

author: Joel_l
author_rank: Frequent Contributor
timestamp: August 25, 2017, 01:27:30 am
content: What were you trying to measure current on? Also, is that a multiplier knob on the end? Was set to something sane for what you were trying to measure?

author: Titan 4380
author_rank: Contributor
timestamp: August 25, 2017, 02:31:31 am
content: Clamp a single wire (active or neutral) only or else you won't see any results on the DMM.

author: billbyrd1945
author_rank: Regular Contributor
timestamp: August 25, 2017, 03:12:10 am
content: I'll try again to make sure I had it on the right setting. I meant to have it on the 0 to 30 amps setting and clamped over the wire of a running box fan.

author: billbyrd1945
author_rank: Regular Contributor
timestamp: August 25, 2017, 05:03:22 pm
content: Learning is often embarrassing because everyone gets to see how little you know.A little Youtubery reminded me that current going in both directions will display a zero value in the clamp. I split the wires and measured that way and even did multiple wraps for more precision. It occurred to me that every learner should do this as an exercise in learning what's going on.

author: Joel_l
author_rank: Frequent Contributor
timestamp: August 25, 2017, 10:59:04 pm
content: Glad you got it sorted out, nice to have something that does not need batteries.

author: innkeeper
author_rank: Unknown
timestamp: August 25, 2017, 11:36:49 pm
content: i can see were amprobe got there design queues form

author: billbyrd1945
author_rank: Regular Contributor
timestamp: August 26, 2017, 02:38:37 am
content: I should mention that Titan4830 posted what to do before I went to YouTube. I just didn't know what he was talking about at the time. Thanks Titan!
FW3200S Host PC Computer Communications - Page 1
Forum section: electronics / testgear

author: Ronkpa
author_rank: Newbie
timestamp: August 25, 2017, 01:41:28 pm
content: I am running the FY3224S Arbitrary Function Generator. Works good from the front panel and with the supplied control software via USB comm port. However I can't get it to work with Putty or a C# program using any of the commands (such as "a") as listed in the Communication Protocol Specification Rev 1.2 2015-9-11. Can anyone help me get started? Thanks.

author: Ronkpa
author_rank: Newbie
timestamp: August 25, 2017, 02:45:41 pm
content: The linefeed must immediately follow the command without any gap in time.
Lecroy firmware suffix ?  - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: August 24, 2017, 11:59:39 am
content: I've now seen several times XStream scopes (WM8K, WP7K, WR6K) with a firmware revision ending with a 'd' suffix...Anyone knows what this is about... a debug version ??

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 25, 2017, 08:42:49 am
content: Production X-Stream software version numbers are numerical only.X-Stream packages with a non-numerical versions are usually internal development/testing releases.Unless there's a specific reason to use it I'd upgrade to the last production version for your scope.
HP 54622A Scope & HP Basic help - Error 157 - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: August 24, 2017, 06:07:02 pm
content: Hi All,I posted this on the Yahoo HP group but I thought I'd try here as well - I'm hoping that there might be some HP Basic experts on the forum that can help with this issue.I'm trying to run the 54622A Example Program and I'm running into an error with how the example gets data from the scope. The example program code is:Code:2460 !**********************************************************************2470 ! IMAGE_TRANSFER2480 ! In this example we will query for the image data with :PRINT?,2490 ! read the data into the string Print_info$, and then save the2500 ! data to the file "image.dat: which you can then send to a printer.2510 !**********************************************************************2520 DIM Print_info$ ! allocate memory for low res printer data2530 OUTPUT @Scope;":PRINT?" ! Query for print data2540 PRINT "Reading printer data..."2550 ENTER @Scope USING "-K";Print_info$ ! Read in print data2560 ON ERROR GOTO 25802570 PURGE "image.dat" ! try and delete old file2580 OFF ERROR ! turn off error condition2590 CREATE "image.dat",1 ! create new file2600 ASSIGN @Image TO "image.dat" ! open file2610 OUTPUT @Image USING "#,K";Print_info$ ! write data to file2620 ASSIGN @Image TO * ! close filewhen I run this I get the following error:ERROR 157 IN 2550 No ENTER terminator foundThe "-K" value in the ENTER command is supposed to setup a freefield entry per the help file:QuoteClearly I have some terminator problem going on but I can't find what it is or where to address it.Any ideas?The environment is Win 7, using Keysight Connection Expert 2017 version 18.0.21916.2 talking to a E5810A GPIB to LAN interface as a remote GPIB Interface. The HP Basic for Windows version is "HP Basic for Windows E2060C Release 7.1".Thanks in advance,TonyG
ZeroPlus Logic Analysers - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: August 23, 2017, 01:00:12 am
content: Got a bunch of stuff from ZeroPlus.Interesting use of USB 3 for the cables and heatshrunk probe heads.

author: Dan Moos
author_rank: Frequent Contributor
timestamp: August 23, 2017, 01:11:49 am
content: Quote from: EEVblog on August 23, 2017, 01:00:12 am
iphone Headphone Output Level - Page 1
Forum section: electronics / testgear

author: joshund
author_rank: Newbie
timestamp: August 23, 2017, 07:51:13 pm
content: Does anyone know what the approximate peak to peak voltage should be when you measure the output of a digital full scale sin wave (say 1kHz) from the headphone output of an iphone (4s or newer) into a large load (1Mohm or more)? Does the signal have a DC bias or is it centered about 0V? I would measure it on my iphone but I do not currently have an oscilloscope and haven't been able to find any information about the output levels online.

author: bjcuizon
author_rank: Frequent Contributor
timestamp: August 23, 2017, 10:07:01 pm
content: Why do you need to measure its output?Anyhow, my dad has the 4s and he's not here now so I'll try to measure it later and give you the figures once he arrives.(Unless somebody in here has another one to test on of course)

author: shteii01
author_rank: Frequent Contributor
timestamp: August 23, 2017, 11:15:13 pm
content: The output is not digital, it is analog.On iPhone SE (iPhone 6 derivative), at maximum volume the output is 0.48 V peak @ 1 kHz. I used Tone Gen app. So figure it is 1 volt peak to peak. The signal is centered on 0 V, no DC bias.

author: ruairi
author_rank: Frequent Contributor
timestamp: August 24, 2017, 02:37:03 am
content: May the power of Google be with you….http://www.kenrockwell.com/apple/iphone-6s-plus-audio-quality.htmAnd detailed measurements of several previous models here -http://www.kenrockwell.com/apple/index.htmSend Ken a donation if you find these measurements useful, link at the bottom of the review. (I just did).

author: IanB
author_rank: Super Contributor
timestamp: August 24, 2017, 02:45:15 am
content: Quote from: joshund on August 23, 2017, 07:51:13 pmYou can measure it with a multimeter on AC volts (or AC millivolts) if you have one.
Present generation USB Oscilloscope Hantek-6254BC 4CH250MHz 1GHZ is it good deal - Page 1
Forum section: electronics / testgear

author: suryaputhra
author_rank: Regular Contributor
timestamp: August 22, 2017, 05:21:29 pm
content: I am looking for oscilloscope for my hobby and home lab, considered below USB scopes they are cheaper than bench scopes below are the linkshttps://www.aliexpress.com/item/PC-USB-Oscilloscope-Hantek-6254BC-4-CH-250MHz-1GSa-s-waveform-record-and-replay-function/32792816017.html?spm=a2g0s.8937460.0.0.ImASwVhttps://www.aliexpress.com/item/Hantek-6254BD-Osciloscopio-PC-Based-Handheld-Oscilloscope-Digital-4Channels-250MHz-USB-Oscillograph-with-25MHz-Signal-Generator/32801048374.html?spm=a2g0s.8937460.0.0.vfrXJBhttp://www.hantek.com/en/ProductDetail_2_10164.htmlhttp://www.hantek.com/en/ProductDetail_2_9163.htmlYour expert advises please, thanks in advance.

author: egonotto
author_rank: Super Contributor
timestamp: August 22, 2017, 06:24:47 pm
content: Hello,it has only 64kBLook at my experience with another Hantek USB-oscilloscope DSO3064A"https://www.eevblog.com/forum/testgear/experience-with-dso-2074g/msg1194745/#msg1194745"Best regardsegonotto

author: suryaputhra
author_rank: Regular Contributor
timestamp: August 22, 2017, 07:01:46 pm
content: @egonotto, So what is your final opinion on my selection

author: suryaputhra
author_rank: Regular Contributor
timestamp: August 22, 2017, 07:53:15 pm
content: Is it possible to test 96V DC SMPS power bank chargers with these usb scopes, if I use 10x probe I am pumping in just 9.6V at scope input am I right?, is it possible test such voltages with this scope, thanks in advance.

author: suryaputhra
author_rank: Regular Contributor
timestamp: August 23, 2017, 04:57:43 am
content: Can some one put light on above scopes.

author: egonotto
author_rank: Super Contributor
timestamp: August 24, 2017, 12:51:47 am
content: Hello,it has only 64kBIf this is enough for you?They have only 1GS/s for 4 channel with 250 MHz. Far too lowBut they a cheap.The software of my scope is not very stable. It crash often.But I don't know if this is the case with the scopes you want.You must decide yourself.************ W A R N I N G **************************************************You ask:"Is it possible to test 96V DC SMPS power bank chargers with these usb scopes, if I use 10x probe I am pumping in just 9.6V at scope input am I right?, is it possible test such voltages with this scope, thanks in advance."This is very dangerous!There can be very high voltagesAnd the USB-scope has USB-ground.So you need differential probes.!!!!!!Don't do measure on those dangerous equipment before you acquire the required knowledge!!!!!************************************************************************Best regardsegonotto
Advantest R3172 tracking generator 16MHz offset frequency - Page 1
Forum section: electronics / testgear

author: Samogon
author_rank: Frequent Contributor
timestamp: August 24, 2017, 04:42:36 am
content: Hi,When i try to use TG on the unit it is sweeping +16MHz of center frequency set.I found it when tried to setup some test. And found that it will not track at all.I connected oscilloscope and see that it outputs proper amplitude signal but 16MHz about setting.Also connected counter and it shows same shift i guess it is exact 16MHz measured with zero span set.This SA had dead battery so i have setup new and calibrated, unit passed self calibration no problem.Can someone give advise where to start please?Thank you.
Test/review of DMM Aneng AN8008 - Page 1
Forum section: electronics / testgear

author: HKJ
author_rank: Super Contributor
timestamp: August 22, 2017, 03:05:08 pm
content: For the full review seehttp://lygte-info.dk/review/DMMAnengAN8008%20UK.htmlThis is a cheap DMM with all common function.Frequency output at highest frequency, it is a +/- 1.6V signal.ConclusionThe meter is easily within the specified tolerances (Except 10A) and it has lot of functions and ranges, but the CAT rating is fake.This is a small DMM in size, but has most of the expected functions in a universal DMM. It has a hole in the current range, it can measure currents in that range, but with fairly low precision, instead it has very low burden voltage in the mA range and low precision at high current.I do not like the small fuse size, they cannot break high voltage or high current and they can be hard to source locally (They can be found on Ebay). The current range on the voltage input is also a bad idea.The 9999 count secures the best possible resolution for 4 digits.I will call it good DMM for hobby use, but keep it away from anything with mains voltage and lots of amps.