hybridfree/eevblog-posts huggingface dataset:
Chinese 10f20 15volt multimeter batteries? - Page 1
Forum section: electronics / testgear

author: rt
author_rank: Regular Contributor
timestamp: July 14, 2015, 11:24:03 am
content: Hi all,Are these 15v 10f20 "multimeter" batteries unique to Chinese brands or are there any western name brands that make them?http://www.ebay.com/itm/2-10F20-15V-Carbon-Zinc-Battery-220A-B154-DH554-GP220-for-Voltage-meter-/320696870212?pt=LH_DefaultDomain_0&hash=item4aab05e544Thanks,rt

author: tautech
author_rank: Super Contributor
timestamp: July 14, 2015, 11:31:21 am
content: They've used similar square ones in AVO meters and others over the years, still available at horrible prices, so when i need something similar I just make a stack on button cells and shrink sleeve them into a pack, maybe with some copper tubing on the ends to meet the same dimensions.

author: Fraser
author_rank: Super Contributor
timestamp: July 14, 2015, 11:49:58 am
content: Duracell and Ever Ready (Energizer) made them for AVO meters but there is less demand for such these days. The battery is a BLR121 (B121). The early AVO batteries were Zinc Carbon but the Duracell and Ever Ready types were IIRC Alkaline and lasted a very long time. They were expensive though.http://www.petervis.com/electronics%20guides/Avo%208/B121%20Battery.htmlThe BLR121 is also to be found in some photographic equipment so there remains a need for these to be made. For how long though ? The AVO is still a NATO supported instrument so a NATO numbered 15V battery remains a requirement for NATO. NSN 6135-99-791-1875http://www.nsn-now.com/Indexing/ViewDetail.aspx?QString=6135997911875I attach the MOD spec sheet for the battery.Rapid still sell an Alkaline version at around £6 and it has the NSN on it so looks to be from a NATO parts supplierhttp://www.rapidonline.com/Electrical-Power/BLR121-15V-Multimeter-Battery-18-0265I attach the Rapid Data sheet as well.Just do a search on BLR121 and ensure you buy an Alkaline for long life and low leakage risk.http://cellpacksolutions.co.uk/online-shop/cell-pack-solutions-avo-8-blr121-multimeter-battery/http://www.smallbattery.company.org.uk/sbc_a411.htmhttp://www.maplin.co.uk/p/keyfob-battery-15v-blr121-1-pack-fm07hhttp://www.thexmod.com/item_detail.asp?id=12666http://www.espspecialbatteries.co.uk/battery/ESP-8-79-815Ahttp://www.ebay.co.uk/itm/BLR121-BATTERY-FOR-AVO-8-METERS-15V-/260635338455Alternative that uses batteries available cheaply from the Pound Shop (IIRC £1 for 8 cells) :http://martin-jones.com/2013/07/31/avometer-8-blr121-15v-battery-replacement/

author: rt
author_rank: Regular Contributor
timestamp: July 14, 2015, 04:59:42 pm
content: Thanks for the detailed repliesA stack of coin cells it is so.rt
Fluke 101 Chinese Characters, Translation please - Page 1
Forum section: electronics / testgear

author: saturation
author_rank: Super Contributor
timestamp: July 13, 2015, 08:46:56 pm
content: This is on the rear of the meter, image taken from a tabao seller.Can anyone translate all the Chinese characters written on it? Thank you.

author: RobertHolcombe
author_rank: Frequent Contributor
timestamp: July 13, 2015, 11:56:02 pm
content: For reference the 107 has the same markings plus additional information/warnings about the current range, fuse and min interrupt rating

author: Wytnucls
author_rank: Super Contributor
timestamp: July 14, 2015, 04:40:52 am
content: My 101, bought in Malaysia, doesn't mention the country of manufacture:

author: saturation
author_rank: Super Contributor
timestamp: July 14, 2015, 12:01:04 pm
content: Thank you all.Yes, plus its marked CSA and KCC. I noticed this in a review from a member from India but other owners with Chinese characters version have no 3rd party safety testing mark, just the "CE" mark.Also the Fluke version of the 101 datasheet for Malaysia or India make no mention of CSA or KCC safety certification.http://www.fluke.com/fluke/myen/digital-multimeters/compact-multimeters/fluke-101-digital-multimeter.htm?PID=77003I also cannot locate its CSA documents through CSA, so I presume it was withdrawn:http://www.csagroup.org/Correction. The 101 and several other Chinese made not sold in US DMMs such as 15b, 17b etc., have CSA listings.http://www.csagroup.org/global/en/services/testing-and-certification/certified-product-listing/certficate/044340_C_000%257C3631-86Quote from: Wytnucls on July 14, 2015, 04:40:52 am
Analogue  discovery  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: July 13, 2015, 07:18:27 pm
content: I have a Analogue discovery. This is the second one I have received. After the first failed with the USB connection becoming dislodged. I have been extremely careful with this one. I used it a long while back and then put it away for sometime. It was working the last time it had been used.Strangely it no longer works computer don't even search for driver and there are no sign of physical damage. So I don't know why it has failed.Are there problems with the Analogue discovery design as I am not sure why its broken It was working the last time and I just put it away.R_G_B

author: mtdoc
author_rank: Super Contributor
timestamp: July 13, 2015, 07:33:27 pm
content: I use mine all the time and have no problems. Does your computer recognize it as being connected under the device manager? Does the led light up when connected? Have you tried reinstalling the software?

author: Howardlong
author_rank: Super Contributor
timestamp: July 13, 2015, 08:15:58 pm
content: No problems with mine either, touch wood, and I mostly use it out on the road (or on rails or in the air) so it sees its fair share of abuse when travelling.

author: miguelvp
author_rank: Super Contributor
timestamp: July 14, 2015, 12:28:37 am
content: Or malfunctioning USB on the PC.Knock on wood it hasn't happened to me yet, but just probing with a scope with the voltage potential between the scope ground and the DUT, specially if you use different USB development boards could have damaged the PC USB Bridge. Did you try to see if the port is functional?As for the Discovery, mine was fine last time I used it (last week)

author: R_G_B_
author_rank: Frequent Contributor
timestamp: July 14, 2015, 06:01:51 am
content: I Plugged it into a different computer and it worked. quickly went back to EEVBLOGTo delete this post. And found nobody had posted. So deleted post. Woke up this morning to see the post is still live and people have posted. Never mind.I should have checked with another computer before posting my apologies.Thanks for you all for your inputR_G_B
Keysight DSO/MSO 3000 Series: Neg. DC offset on Probe Compensation terminal ... - Page 1
Forum section: electronics / testgear

author: _Harry_
author_rank: Contributor
timestamp: July 13, 2015, 08:18:10 pm
content: Hi!That's my first digital scope: A MSOX3024T + brand new.Sure - my finding is not a big deal - just kinda blemish ... but perhaps one experienced user knows a way to correct that ... (maybe using remote programming or somewhat)Even when the scope runs on operating temp, that 2.5V / 1KHz square test signal on Probe Comp terminal has a negative DC offset of 100mV ... 120mV (verified using a second scope). Seems there is no menu option for correction.Little down side: The scope provides training signals, coming out on the same terminal (and on a 2nd one) and all of them have that negativ offset too ...Btw:I'm wondering, that these generation of scopes has no option for "zeroing" any input offset drifting caused by operating/environment temp fluctuations (good old analog scopes are equipped with a pot for DC "Balancing", and some of you may remind yourself on Tek probes, having a GND-Ref push button to check that from time to time).Anyway ... at most sensitive setting = 1mV/div and warm scope (>30 min) the 4 traces just off by <+/-100uV/CH (still on factory cal); guess, that's ok.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 13, 2015, 08:40:09 pm
content: Set your acquisition mode to "Average" and see what value are you getting then.On my MSO-X2024A series I am getting -10mV offset and on my DSO-X3034A I am getting -5mV offsetAre you sure your offset is set to 0.00 V in the Wave Gen setting?

author: _Harry_
author_rank: Contributor
timestamp: July 13, 2015, 09:36:04 pm
content: Yepp, no offset is set for the BNC Gen Out, but settings for the "BNC" do not take any effect to the separate Probe Comp "lug".Ok, using Averaging (# = 8 ), the Pobe Comp terminal Offset is only -70 ... -80mV. Maybe still a bit much?On the BNC Gen Out it looks good. I've set the Generator signal equal to 1KHz with H-Lev. = 2.500V, L-Lev = 0.0V, High-Z -> these are the measurement results of the low signal onAquire = Normal / high-Z out: -50 ... -70mV (that's caused by the probe; w/o the probe connectet the trace on screen is -5mV)Aquire = Averaging (# = 8 ) / high-Z out: -26 ... -28mV (dto. -> -2,4mV)

author: HighVoltage
author_rank: Super Contributor
timestamp: July 13, 2015, 09:46:55 pm
content: Set the output impedance of the signal generator to 50 Ohm and do the same for input impedance of the channel that you do the probing with and connect both with a 50 Ohm BNC to BNC cable. What is the offset then?

author: _Harry_
author_rank: Contributor
timestamp: July 13, 2015, 10:02:55 pm
content: If 50 Ohm is set on BNC GEN out and CH1 / using RG-58 coax:-21 ... -23mV (-11 ... -13mV on open input CH1, so cable removed)Unfortunately the Probe Comp terminal / Training signals on that can't be set at 50 Ohm ...The generator signals on BNC Gen output look ok to me.Just signals on Probe Comp terminal are not perfect (still -70mV ... -80mV on Averaging mode); maybe that offset can be corrected by SW ...
Agilent 6643A vs Rigol DP832 - Page 1
Forum section: electronics / testgear

author: Http 418
author_rank: Newbie
timestamp: July 13, 2015, 08:52:52 am
content: What to go after for the less the PRO home hobbyist ?To me spec wise they look allmost identically?Regards

author: Macbeth
author_rank: Super Contributor
timestamp: July 13, 2015, 10:52:25 am
content: Identical? haha. The 6643A is a system PSU - ancient, huge, designed to go in a rack, outputs at the back, single channel 35V / 6A, programmable by GPIB (expensive interface card needed)The Rigol is a bench PSU, new, compact, sits on the bench, outputs at the front, three channel 30V / 3A x 2 and 5V / 3A, programmable by USB / RS232 (interface is free)Those old HP/Agilent boat anchors can be a bit of a bargain when they go for the $100 range. But I would have a DP832 over it any day even for the extra few hundred dollars.(Source: I have both a DP832 and a HP 6632B - a similar boat anchor of a PSU)ETA: Links to some great Dave vids for both supplies
DG1022 firmware update, has anyone got it? - Page 1
Forum section: electronics / testgear

author: jeremy
author_rank: Super Contributor
timestamp: July 13, 2015, 05:39:12 am
content: Hi all,I'm trying to track down a firmware update for my DG1022 function generator. It reports itself as:RIGOL TECHNOLOGIES,DG1022 ,DG1DXXXXXXXXX,,00.02.00.06.00.02.07According to the Rigol website, this is not the latest version, but I have tried requesting the firmware update to no avail.Can anyone help me out?

author: flolic
author_rank: Frequent Contributor
timestamp: July 13, 2015, 06:13:53 am
content: Unfortunately, firmware on your unit can not be updated to a newer version than already installed.Dear Mr. xxxx,I have double checked please see attached table.The bold lines mean: no update with would "cross" the line is possible.(Embedded image moved to file: pic30100.gif)Best regardsThomas RottachApplication EngineerRigol Technologies EU GmbHLindberghstraße 482178 PuchheimThis table and reply I received from tech support. I have unit with the same firmware version as yours.

author: jeremy
author_rank: Super Contributor
timestamp: July 13, 2015, 06:15:54 am
content: dang, I guess I'm fighting these USB remote control bugs on my own. Thanks for your help.
UNI-T UT70D - How to extend the backlight time? - Page 1
Forum section: electronics / testgear

author: kamil004
author_rank: Newbie
timestamp: July 13, 2015, 05:04:16 am
content: Hi everyoneI have this multimeter and backlight time is pitiful, in real ~30sec (in user guide ~60sec)Is there any chance to extend the backlight time?
Why is the Fluke 80i-110s so expensive??? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: July 12, 2015, 07:56:02 pm
content: Hi Everyone,I've wondered this for a long time. Why is the Fluke 80i-110s so expensive???Thanks,Alan

author: HighVoltage
author_rank: Super Contributor
timestamp: July 12, 2015, 08:23:14 pm
content: It is re-branded by Fluke and they can ask a high price, I guess.The original manufacturer is AEMC and you get them for much lower cost, especially if you have some time and wait a little on ebay auctions. The AEMS Model number isSL261http://www.amazon.com/AEMC-SL261-Connection-10A-100mV-100A-10mV/dp/B008S07W6Y

author: fivefish
author_rank: Frequent Contributor
timestamp: July 12, 2015, 09:52:28 pm
content: Like medical grade outlets, a big electrical manufacturer rep told me it's so they can build a "war chest" fund in case someone dies from using their equipment.My guess is it's a similar thing for these high voltage probes... in case of equipment fault and someone dies, they'll have the "war chest" for settlement or litigation.
Hakko FX 888D unboxing + basic tests - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: July 11, 2015, 03:15:43 pm
content: Just got my new soldering iron...Two thumbs up!

author: Fungus
author_rank: Super Contributor
timestamp: July 12, 2015, 01:07:49 pm
content: I've just been using it in anger, and, wow... I've been missing out!It's sooo much easier/faster to solder things that absorb even amodestamount of heat.
Interchangeablity of HP Logic Analyzer cables and Flying Leads? - Page 1
Forum section: electronics / testgear

author: Stray Electron
author_rank: Super Contributor
timestamp: July 11, 2015, 04:46:27 pm
content: Does anyone have list of what Logic Analyzer cables will work on other models of HP Logic Analyzers?Some of the the flying leads that came with My HP 1670D are still in their original sealed package and the PN on them shows that they were designed for the HP 1650. I also compared them to the flying leads from my HP 16500A and they're almost identical. The only difference is that the labels on the 1670 leads are in color and the labels on the 16500 leads are black on grey. The pinouts are the same and they're physically the same except that the ground lead (pin 2) on the 1670 leads is black and is shorter than the other leads. On the 16500 that lead is grey and the same length as the others.The cables on the 1670D and the 16500Alookdifferent, the 16500 cables look like cloth and the 1670 cables have a smooth plastic finish. But the connectors on both ends appears to be the same so I think they are interchangeable.The 16500s, the 1650s, the 1660 and the 1670 share a lot of common items and Isuspectthat the leads and cables are interchangeable in all of them.Does anyone have any further knowledge about the subject?

author: NickAmes
author_rank: Contributor
timestamp: July 12, 2015, 02:56:28 am
content: In my (admittedly limited) experience, the cables/clips for all HP logic analyzers using the large 40 pin connector are the same.
Agilent DSO6014A is the fixed 1meg input impedance a concern? - Page 1
Forum section: electronics / testgear

author: Chris Wilson
author_rank: Super Contributor
timestamp: July 11, 2015, 12:43:01 pm
content: I am looking at a used Agilent DSO6014A 100 MHz scope, and I note the 100 MHz bandwidth models only have input ports with 1 meg ohm input impedance. I am mainly into amateur radio and also attempt repairs on 1980's test gear. Will the fixed 1 meg input impedance be a PITA, or can I use 50 ohm feed through resistors when required? I currently use old school analogue scopes. Any other comments on these scopes welcome. I am in the UK, thanks.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 11, 2015, 01:22:41 pm
content: The DSO6000 series is internally the same as the DSO7000 series scopes.I used an older 100 MHZ 7000 series scope in the past and just used a 50 ohm feed through resistors, when needed. No problem at all.You can find them on ebay with reasonable prices.My Agilent MSO7104B luckily can switch between 1M ohm and 50 Ohm.

author: tggzzz
author_rank: Super Contributor
timestamp: July 11, 2015, 01:35:47 pm
content: Of course itisn't1Mohm input impedance. It is 1Mohm//11pF, and it is worth working out the frequency at which the capactive impedance starts to dominate the resistance.If you are using bog-standard *10 "high impedance" probes, make sure they can be compensated with a 11pF scope.Apart from that, you can always use a 50ohm feedthrough terminator if you are looking at RF signals, or with a "low"-impedance *10 Z0 probe (N.B. the quotes - Z0 probes are actually higher impedance than so-called high-impedance probes!)At 100MHz you could also use a 50ohm terminator on a BNC T-piece.
Broken Rigol DS 1052 E - No respond to any signal - Page 1
Forum section: electronics / testgear

author: kill_gil
author_rank: Newbie
timestamp: July 10, 2015, 08:50:36 am
content: Hi everyone!I'm a happy owner of a rigol 1052e(until yesterday). Its hardly used in a perfect condition (only 80 times started).Yesterday after first use in two months something went wrong with the screen backlight. Normally after pushing the on/off button the screen was in 2-4sec alive. This time it took about 20 seconds but it seemed to be all right. It wasn't.The oscilloscope does not respond to any signal given to the channel one or two. I've tried several probes. It shows only noise on the screen like the probes wouldn't be connected.I sorted out the power supply and the backlight is now OK but i can't find the cause of not showing any signal. Besides that all the functions semms to be all right.I hope somebody can help me

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2015, 09:40:23 am
content: Have you studied this:http://www.public.asu.edu/~kyle135/Supplementary/LA/RIGOL_DS1000D/Service%20Guide%20DS1000D.pdfOr this:http://rigol.codenaschen.de/index.php/Schematics

author: kill_gil
author_rank: Newbie
timestamp: July 10, 2015, 04:04:47 pm
content: Thanks a lot for the quick reply. The documents were very helpfulI think the problem is related to the "LCD backlight enable" pinout.Can anyone tell me what controls the pinout of the "LCD backlight enable"?I've searched with my multimeter but I couldnt find on the circuit board where the pin goes.
GPIB commands for calibration info? - Page 1
Forum section: electronics / testgear

author: farsi
author_rank: Regular Contributor
timestamp: July 09, 2015, 09:26:43 am
content: Hi,a number of instruments store calibration information internally.Now, I saw this GPIB "hidden commands" for an Agilent 8960:http://geoisfun.com/Agilent_8960/PL13_GPIB.html- apparently with a command "PL13"What about reading calibration information from other instruments? Any ideas how/what is possible?Thanks!

author: Stray Electron
author_rank: Super Contributor
timestamp: July 09, 2015, 09:45:30 am
content: You can dump the operating system ROM and then use something like Edlin or List.com or even WordStar in a non-document mode to look for text strings. Then send the text strings over HP-IB and see what they do or what the error message is. You also send them and also send random parameters such as 13 with them and again, see how the equipment responds. Actually with any computer with a HP-IB interface you canautomatethe entire process including logging the results (if it returns anything via HP-IB).I did this once using an HP-85 to sequentially step though all possible codes in order figure out what codes generated what words and/or sounds on a HP-IB to speech convertor that I had no data for. I had to listen to the audio output and if it said something, I hit a key to pause the process and to have it display the just sent code. I then wrote the code down along with the sound or word that it made and then pressed the Continue key to tell it to continue. It took about a half day to write the program and then run it and find all of the codes and generated words/sounds.

author: z01z
author_rank: Regular Contributor
timestamp: July 10, 2015, 12:03:28 pm
content: For Keithleys there is a GPIB command :CAL:PROT:DATA? that returns calibration constants.For2001and2002TiN did some reverse engineering.It also works for 2000.

author: farsi
author_rank: Regular Contributor
timestamp: July 10, 2015, 01:41:03 pm
content: Thanks for the feedback.Ok - accessing the ROM would probably be a bad idea, since I am not the owner of the instruments, and the owner won't like that.I tried the GPIB command but somehow I get "unterminated header". Anyway, this was just to get some new ideas, and I might get some old device on Ebay to explore that path a bit further.
Anyone used python with Maynuo eload? - Page 1
Forum section: electronics / testgear

author: Harvs
author_rank: Super Contributor
timestamp: April 15, 2014, 06:58:43 am
content: There's a library on the BK precision website for use with their 8500 eLoads. I'm wondering if anyone has got it working with the Maynuo M97xx e-loads, since they're essentially the same I believe.I've just tried with a M9710, but it hangs waiting for a response (yes the serial works fine with the Maynuo software, which looks the same as the BK precision software I've seen.)When I have time I could reverse engineer it since the protocol is documented in the manual, I'm just wondering if anyone has already done this and got it working?

author: Harvs
author_rank: Super Contributor
timestamp: April 16, 2014, 09:06:51 am
content: So I looked into it, and the packet format for the BK Precision 8500 in the downloadable python script is quite wrong for the Maynuo. Go figure...Anyway, I've been writing my own and put it on git.https://github.com/harvie256/MaynuoPyTwo test scripts are included for the library at the moment. I've only started doing the most basic commands, because at this point that's pretty much all I need, but I would be trivial to add whatever you need from the user guide. I'll continue to add them over time as needed.The two test scripts on there are a Constant Power battery discharge logger (as far as I can work out, the standard software doesn't do this,) and a IV plotter (which again seems ridiculously painful to do with the standard software.)

author: Harvs
author_rank: Super Contributor
timestamp: April 16, 2014, 09:51:30 am
content: And a quick example after finessing in excel.

author: petesoper
author_rank: Newbie
timestamp: July 10, 2015, 10:28:50 pm
content: I just got an M9711 and your code will be a great help. Thanks!
DS2000 options bundle at TEquipment... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: July 10, 2015, 12:57:14 am
content: Got an email about it - all 4 options at one price:http://www.tequipment.net/Rigol/BND-MSO/DS2000A/Options/
OWON AG1012F or ATTEN ATF20B or Hantek HDG2022B - Page 1
Forum section: electronics / testgear

author: manuelgonzagaiii
author_rank: Newbie
timestamp: July 07, 2015, 03:55:16 pm
content: Hi,I'm quite new to electronics and I'm planning to buy my first Function Generator. They are on the same price range in ebay.I've done a search on Owon AG1012F, Atten ATF20B and Hantek HDG2022B but unfortunately there are only few discussion on the products and model. So I'm still quite confused on what to buy.As a beginner, I would like to know what is better to buy that have the best quality and functions that suits for me. I'm currently doing some microcontroller projects.Also, kindly give the Pros and Cons of each production and model.Thanks in advance!Maning

author: Muxr
author_rank: Super Contributor
timestamp: July 07, 2015, 04:00:48 pm
content: You will also find Rigol DG1022 and Siglent sdg1000 and sdg800 series Signal generators in the same price range, which seem to be the popular choices on the forums. I think that ATTEN is based on the Siglent's design (I think Owon might be as well), kind of funny though that front USB port is fake on the Atten. There is nothing connected to it.Not really familiar with these models, but the Hantek has a 16 bit DAC, which is interesting.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: July 07, 2015, 04:25:37 pm
content: Quote from: manuelgonzagaiii on July 07, 2015, 03:55:16 pmWasn't that the one where the USB port is just for show as it isn't connected to anything?

author: Muxr
author_rank: Super Contributor
timestamp: July 07, 2015, 04:59:19 pm
content: Yeah I am pretty sure that's the one

author: manuelgonzagaiii
author_rank: Newbie
timestamp: July 08, 2015, 06:28:19 am
content: Thanks a lot! I will research on the forum regarding Siglent and Rigol Function generators.
Metex MS-9170 & 9140 Counter/Func Gen/PSU/DMM Combo - Page 1
Forum section: electronics / testgear

author: dexters_lab
author_rank: Unknown
timestamp: July 09, 2015, 01:51:11 pm
content: are these things any good? - i could do with a basic counter & function gen but they do look at bit cheapo taiwanese/prc crap... this seller has 15 of them in various states (mostly of disrepair!)http://www.ebay.co.uk/sch/m.html?_odkw=&_ssn=computerdisposalsltd&_armrs=1&_osacat=0&_from=R40&_trksid=p2046732.m570.l1313.TR11.TRC1.A0.H0.Xmetex.TRS0&_nkw=metex&_sacat=0

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 10, 2015, 08:34:38 pm
content: This is like pre-2000 design.
eBay frequency counter shows second harmonic while DS1054Z shows actual frequency - Page 1
Forum section: electronics / testgear

author: netdudeuk
author_rank: Frequent Contributor
timestamp: July 09, 2015, 06:48:12 am
content: I've built one of the cheap 10MHz sources (although mine starts at 5MHz). My Rigol shows the correct frequency as does the eBay frequency counter module for the first few frequencies from 5MHz down but at 625KHz, while the scope is correct, the frequency counter shows the second harmonic. This carries on all the way down after that.Any idea why that should be and how I can make the frequency counter display the actual frequency and not the harmonic ?
Siglent SDS2000 Oscilloscope Promotion Extension - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: February 26, 2015, 02:48:58 pm
content: Greetings!Because of the popularity of Siglent's recent SDS2000 oscilloscope promotion, which was scheduled to end February 28, we have extended this promotion until April 30. This promotion offers free upgrades to a higher frequency version and free option combinations on new orders.For details please see this link. The link has the old promotion end-date so that should now be changed to April 30.http://www.siglentamerica.com/pdxx.aspx?id=25&T=2&tid=1-Or-http://www.siglent.com/ENs/pdxx.aspx?id=25&T=2&tid=1Thank you.Steve

author: rf-loop
author_rank: Super Contributor
timestamp: February 26, 2015, 03:05:39 pm
content: One note:Siglent (Hdqrs) told to me that new offer period start from 1.March and new offer period include only 4 channel models. 2 channel models are dropped out from this offer.Edit: I get new information today: New offer period continue with old rulesuntil further notice.

author: Unknown
author_rank: Unknown
timestamp: February 27, 2015, 02:22:17 pm
content: Hello.The factory tells me that they had considered making the promotion extension available only for the 4-channel versions so that appears to be where the information came from. But I have now been informed that the 60 day extension on the promotion will cover all models (2 and 4-channel models), as before.We will update our websites to show this.Thanks.Steve

author: tautech
author_rank: Super Contributor
timestamp: July 08, 2015, 04:05:40 am
content: Just a heads up for those considering purchasing a new DSO.The SDS2000 series promotion returns exactly as before for a limited duration with BW upgrades and free options if you purchase MSO .Terms & conditions:US market:http://www.siglentamerica.com/qyxwxx.aspx?id=1341&sid=216NOTE: USA for July only.The rest of us:http://www.siglent.com/ENs/qyxwxx.aspx?id=1115&sid=205Untill 30 September 2015
Fluke 8810A - meter not rezeroing after making a reading - Page 1
Forum section: electronics / testgear

author: RedShoeRider
author_rank: Contributor
timestamp: July 08, 2015, 02:34:15 am
content: Good Day, All:This is a new one to me....I have a Fluke 8810A; have had it for a few years now, and despite its age, it serves me well. It has both the RMS AC and Ohms options. This evening, however, it started doing something entirely odd.I was adjusting a 12V supply rail in a power supply, and true to form, it was tracking right along. However, when I disconnected the leads.......it was still reading 12.xxx volts! I thought I was seeing things, so I disconnected the leads from the jacks, and it was still reading 12.xxx volts. Ok, so I reconnected the leads and shorted them together. That zeroed it out, but as soon as I unshorted the leads, it started reading 0.xxx volts, and slowly increasing. This happens with AC reading as well.My initial thought is a failing electrolytic cap right after the input, but before I really dig into it, has anyone seen this before and can point me in the right direction to start with?Thanks!-Red

author: deadlylover
author_rank: Frequent Contributor
timestamp: July 08, 2015, 03:59:36 am
content: Hi mate, I'm not familiar with that meter but my first guess would just be the extremely high input impedance on the 10V range (>1G Ohm). Try switching to a higher range and it should settle down much quicker (usually has a 'normal' ~10M Ohm impedance.This is normal behaviour on most bench meters, it is to reduce circuit loading on the 10V and below ranges.
CEM DT-9987 datasheet  - Page 1
Forum section: electronics / testgear

author: jancelot
author_rank: Regular Contributor
timestamp: July 06, 2015, 02:19:53 pm
content: Hi, anybody knows where I can get the technical specifications datasheet? It's missing on the official website.http://www.cem-instruments.com/en/pro/pro-825.html

author: Stray Electron
author_rank: Super Contributor
timestamp: July 06, 2015, 03:32:10 pm
content: I've never heard of CEM so I took a look at their website. In the top RH corner there are links to Sales, Service, Complaints and Management. I would contact one or more of them.

author: jancelot
author_rank: Regular Contributor
timestamp: July 09, 2015, 07:36:02 pm
content: Ok found it. Here's attached the Datasheet for the CEM DT-9987.

author: Lightages
author_rank: Unknown
timestamp: July 09, 2015, 08:32:25 pm
content: Quote from: Stray Electron on July 06, 2015, 03:32:10 pmThey are the OEM for many other brands, actually rebrands mostly.The Extech EX series seem to be all maybe by CEM for example.
Scope with automatic voltage / level   not the time base - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: July 07, 2015, 03:23:22 am
content: hello does some one know such a scope with this function, where i work i need to constantly adjust the voltage level ... not the auto setup function and on some tested HP models they are slow as hell, since they try to sync everything before displaying the wave form.Since i want to buy a new scope i am searching a minimum of 100mhz bandwith old or new hp/agilent, Uni-T, Rigol etc...If you have suggestions thks

author: miguelvp
author_rank: Super Contributor
timestamp: July 07, 2015, 03:33:18 am
content: I guess you could write a program that would adjust the scope for you using the SCPI commands.Not a terribly hard task but not really easy if you don't know where to start.Just for reference here is the programming guide for the Rigol DS2000 serieshttp://www.tequipment.net/assets/1/26/Documents/Rigol/DS2072/ds2072_doc_5.pdfEdit: I think there are a couple of new commands added on later updates, but just to get the gist of what you can read/set remotely.

author: kwass
author_rank: Frequent Contributor
timestamp: July 07, 2015, 06:22:17 am
content: Quote from: coromonadalix on July 07, 2015, 03:23:22 amThe Tek TDS1000 and TDS2000 series scopes have signal auto-ranging which is exactly what you're looking for (I think). The TDS2000 is still being sold and you can find the TDS1000 scopes too new on ebay. They don't state how fast the auto ranging function is, perhaps someone here has used one and can comment on it. They're all very limited in memory depth and are missing a lot of modern features. The high end 1000 and the 2000 series are 100MHz or greater.Here's more of a description:http://www.tek.com/manual-topic/autorange-0Brand new on ebay for $800:http://www.ebay.com/itm/TEKTRONIX-TDS1012C-EDU-100MHZ-2-CH-1-GS-s-DIGITAL-STORAGE-OSCILLOSCOPE-BRAND-NEW-/321205069705?pt=LH_DefaultDomain_0&hash=item4ac9506789

author: coromonadalix
author_rank: Super Contributor
timestamp: July 07, 2015, 09:30:56 pm
content: Ok thks the tds 1002B seem's to have it, there's an auto range button near the top right of the screen with a dial .... i'll check if a similar model in the 100mhz range exist ...
Agilent N9320B spectrum analyzer soft keys replacements - Page 1
Forum section: electronics / testgear

author: shutterbug70
author_rank: Newbie
timestamp: July 15, 2015, 11:35:34 am
content: I bought a N9320B from the auction site. Came with two soft keys missing. Agilent sells the entire key panel as a replacement but I'd like to know if I can find single suitable replacements. Attached photo.thanks!

author: ivan747
author_rank: Super Contributor
timestamp: July 15, 2015, 01:40:12 pm
content: Are these keys soft? Or are they hard plastic? You could 3D print some replacements if you want.

author: Muxr
author_rank: Super Contributor
timestamp: July 15, 2015, 02:40:30 pm
content: Yup I'd 3d print replacements, you can find flexible filament or just use PLA if you don't care about matching tactile response.

author: free_electron
author_rank: Super Contributor
timestamp: July 15, 2015, 03:20:02 pm
content: for 11 dollar for the whole panel ...you can;t complain about that.

author: ivan747
author_rank: Super Contributor
timestamp: July 15, 2015, 04:07:34 pm
content: Quote from: free_electron on July 15, 2015, 03:20:02 pmWell, at that price, yes, just replace the panel.
CEM DT-9987 vs Extech GX900 - Page 1
Forum section: electronics / testgear

author: jancelot
author_rank: Regular Contributor
timestamp: July 03, 2015, 08:02:45 am
content: Those two multimeters appear to be the same internally, however there's a big gap in price. Is the CEM a chinese copy or are you confident to buy it and expect the same precision and reliability?

author: retiredcaps
author_rank: Super Contributor
timestamp: July 03, 2015, 03:03:17 pm
content: CEM Instruments is the OEM for many manufacturers including Extech. So the Extech is likely the copy here.PS. Martin Lorton has the GX900, but has done no review or teardown on it yet.

author: NoItAint
author_rank: Contributor
timestamp: July 03, 2015, 04:44:59 pm
content: I happened to check availability in the USACEM DT-9987 is not available here. And they have no plans to do so.Extech looks to be the only option here and it might be due to an OEM deal CEM and Extech have.

author: jancelot
author_rank: Regular Contributor
timestamp: July 04, 2015, 07:06:21 am
content: It's curious that the android app for the Extech has higher score on google play than the most CEM apps, some even have 1 star.GX900 ExView for AndroidCEM SoftwareI've tried several languages for GX900 ExView and Meterbox iMM and can't see which country the comments come from. Weird that CEM gets such low ratings for its software, must have lot of issues.
Rigol DM3058 no LAN Ethernet - Page 1
Forum section: electronics / testgear

author: cubitus
author_rank: Regular Contributor
timestamp: July 03, 2015, 05:35:38 pm
content: Hello,I have a problem with the device RIGOL DM3058 (Rigol Technologies, DM3058, DM3L162450050,01.01.00.02.01.00)The entire device seems to work fine except the Ethernet connection.I tried with 3 different network cables, the connection is not established.The LEDs do not light on the plug.Will there a trick to fix this?Is a failure?Thank you

author: DD4DA
author_rank: Contributor
timestamp: July 05, 2015, 07:04:47 pm
content: Open a ticket to Rigol at the local representive - they are fast and helfull.

author: cubitus
author_rank: Regular Contributor
timestamp: July 06, 2015, 10:49:39 am
content: I sent the device warranty.
Rigol Ultra Sigma software with DS1054Z - Page 1
Forum section: electronics / testgear

author: Ecklar
author_rank: Regular Contributor
timestamp: July 05, 2015, 09:28:44 pm
content: Has anyone here actually used Rigol Ulta Sigma software to reset or reload upgrades to their DS1054Z? Did it work?

author: alsetalokin4017
author_rank: Super Contributor
timestamp: July 05, 2015, 10:28:24 pm
content: Yes, I have done so, and it did work, using Windows 7 computer.But since I usually use a Linux computer for my daily work, I find it easier to use telnet over the LAN connection to communicate SCPI commands with the scope.

author: JohnPen
author_rank: Regular Contributor
timestamp: July 06, 2015, 07:48:17 am
content: I tried to delete all the Trial options using Ultra Sigma (Windows 7) which returned a 'timed out' response but action completed. The Trial options however remained in place. However on sending an Install all options DSER this cleared the original Trial options and installed all the upgrades satisfactorily. I believe there is a mention of this in the main DS1054Z posts some time ago and that once you remove the Trial options you cannot restore them. Of course that doesn't matter as the DSER code has brought all the options back.John
Leader 1060 manual - Page 1
Forum section: electronics / testgear

author: rve
author_rank: Newbie
timestamp: December 07, 2014, 03:17:26 pm
content: Hi,I am looking for the user manual for a Leader 1060 oscilloscope.I contacted Leader but they only have the service manual. Does anyone have (a PDF of) the user manual?Thanks.Ralph.

author: Vorlon
author_rank: Newbie
timestamp: July 04, 2015, 12:50:36 am
content: Hi Rve,Did you get the 1060 Service Manual?May I have a copy?Thanks.
Video PXI Chassis Upgrade & Various Module Examination - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: June 28, 2015, 07:29:02 am
content: A quick video of moving to a new PXI chassis and a close look at all of my PXI modules:Watch the video here: [17 Minutes]https://youtu.be/b9y45cevjW8More videos at The Signal Path:http://www.TheSignalPath.com

author: Hugoneus
author_rank: Frequent Contributor
timestamp: June 28, 2015, 09:09:07 pm
content: If anyone happens to have the software for the PXI-4472 let me know! O0

author: miguelvp
author_rank: Super Contributor
timestamp: June 28, 2015, 09:22:28 pm
content: You mean the drivers?http://sine.ni.com/psp/app/doc/p/id/psp-529/lang/enOr the NI Sound and Vibration Measurement Suite?If you click under resources on the product view:http://sine.ni.com/nips/cds/view/p/lang/en/nid/5031#productlistingthere are links to get the software for just $4Khttp://sine.ni.com/nips/cds/view/p/lang/en/nid/203624Or you can get the Sound and Vibration Toolkit for just $2Khttp://sine.ni.com/nips/cds/view/p/lang/en/nid/12152There is an evaluation but not sure if that will actually talk to the hardware or is just a demo.But if you already have LabView do you still need the stand alone software?

author: Hugoneus
author_rank: Frequent Contributor
timestamp: June 28, 2015, 09:31:51 pm
content: Quote from: miguelvp on June 28, 2015, 09:22:28 pmThanks, I know about the NI software and the cost is insane. I thought perhaps there is third party software so I would not have to write my own.I am not a huge fan of LabView, but I should be able to developed something in Matlab for capturing and analyzing data.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 03, 2015, 08:55:03 pm
content: You can take a look at DASYLAB, the little brother of LabView.It works with all NI drivers and is much easier to use.The software was developed in Germany, then sold to NI but then re-acquired by the developer in Germany.I just used it for a project and it worked pretty well.
HP 856XE Center Frequency Drift - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: July 03, 2015, 02:10:50 am
content: Anyone have an idea about what might cause a HP SA center frequency to drift downward about 10MHz in a couple minutes after being set to a center frequency around 2.5Ghz? (After the first couple minutes the rate of drift slows but continues downward.) And how to fix it? Thanks

author: Electro Fan
author_rank: Super Contributor
timestamp: July 03, 2015, 02:48:42 am
content: Update: the center frequency drifts when the SA's input is an antenna designed for Wifi frequencies; when the input is a cable to a signal generator the center frequency remains precisely stable at the set center frequency.

author: Electro Fan
author_rank: Super Contributor
timestamp: July 03, 2015, 04:05:19 am
content: Further Update: after some dial twiddling the whole thing seems to have settled down and no drift occurs with the antenna on the input. Not sure what happened but it's good now....
HP 16702A line voltage - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: July 02, 2015, 02:38:04 pm
content: Does the HP 16702A come with an autosensing power supply to switch between 115 and 230V AC?In the installation guide I only see this remark:Code:HP 16702A: ~Line 115/230 volts ± 20%, 48-66 Hz, 610 Watts max.Not that I blow up when I just unpacked it (o;

author: MadTux
author_rank: Frequent Contributor
timestamp: July 02, 2015, 02:47:21 pm
content: There's no 230/115V switch, since it's a switching PSU that auto-detects the line voltage. Probably a relay inside that switches the SMPS DC input rectifier from full wave (115V) to half wave (220V) bridge

author: davorin
author_rank: Unknown
timestamp: July 02, 2015, 02:50:01 pm
content: Okay..thanks for the quick clarification :-)I thought so...but didn't find a clear description of that in the instruction guide....Wow that bastard boots endlessly ;-)
Plus/minus sign on clamp meter jaw - Page 1
Forum section: electronics / testgear

author: bitwelder
author_rank: Super Contributor
timestamp: July 01, 2015, 05:30:06 pm
content: The other day I received my latest equipment purchase, a mini-clamp meter UT210E, which has been described on this thread:https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg560006/#msg560006On the left clamp 'jaw' there is a plus sign on the top side, and a minus sign on the bottom side. See e.g.What's its purpose?

author: dom0
author_rank: Super Contributor
timestamp: July 01, 2015, 06:25:59 pm
content: Nominal direction of current.

author: belasajgo
author_rank: Contributor
timestamp: July 01, 2015, 06:29:12 pm
content: It has to do with DC current measurement and the direction of the flow of current in the wire (polarity of the magnetic field). If the flow of current is in the other direction, you will get a negative value.

author: Fungus
author_rank: Super Contributor
timestamp: July 01, 2015, 06:34:01 pm
content: Quote from: bitwelder on July 01, 2015, 05:30:06 pmSo you can tell which way the electrons are flowing.(If the meter shows a negative number then they're going the opposite way to the markings on the clamp)

author: bitwelder
author_rank: Super Contributor
timestamp: July 01, 2015, 10:22:48 pm
content: Thanks!

author: jeroen79
author_rank: Frequent Contributor
timestamp: July 01, 2015, 10:41:43 pm
content: And the + means current coming out of the clamp?(and electrons going in)

author: bitwelder
author_rank: Super Contributor
timestamp: July 02, 2015, 06:01:11 am
content: Simple test: test lead going from the + terminal on the bench PSU into the clamp from the top (+) side, to a small load and return to the - terminal on the PSU => meter measures positive currentInsert + wire from the bottom of the clamp => meter measures negative current

author: Fungus
author_rank: Super Contributor
timestamp: July 02, 2015, 07:54:40 am
content: Quote from: jeroen79 on July 01, 2015, 10:41:43 pmGood question! And an amazing opportunity to do an experiment!! I wouldn't let this one escape if I were you...https://xkcd.com/567/
Uni-T UTD2202CE Compensation issue - Page 1
Forum section: electronics / testgear

author: Illukas
author_rank: Newbie
timestamp: July 01, 2015, 02:51:31 pm
content: Hi everybody!Am having a bit of trouble getting the compensation right on the 10x probe. After initially running self calibration and looking at the built-in square wave generator, everything looks good at 1V/div. Looking at the same waveform at 20mV/div, there seems to be quite a lot of over-compensation. After I've fiddled with the capacitor a little bit and everything looks good at 20mV/div and then looking at 1V/div, there's some under-compensation happening.You can fiddle the capacitor to your heart's content, there doesn't seem to be a setting that works both at 1V and 20mV/div. Now I do hear a relay clicking inside the scope when switching up to 1V/div, so that must mean there's a separate vertical deflection circuit for higher voltages, right? Since the under-compensation can only be seen when going up higher from 1V/div, that must mean the seperate circuit is at fault, rather then the input or probe? (I tried 3 probes on both channels, issue is consistent.)I also took some snapshots of the problem, these can be found on imgur here:http://imgur.com/a/lO3edThe scope itself is brand spanking new. Hasn't been dropped or mishandled as far as I can tell. No other obvious signs of malfunction either.Can you give me any advice what else to try? Or should I just send it back as faulty? Or am I just showing my stupid here?

author: electr_peter
author_rank: Unknown
timestamp: July 01, 2015, 10:19:12 pm
content: I think you are trying too hard. You should calibrate scope at 0.5V/div or 1V/div (so that all signal fits on the screen in vertical direction) and it will be compensated properly.When you set scope to 20mV/div, signal overloads input circuitry and weird effects happen (and signal you see on the screen is essentially invalid and wrong, so any compensation to this signal is invalid as well). Other scopes also do this with overloaded input.This is not the right way to do compensation - if you want to check 20mV/div level, provide good quality square wave at ~50mV Vpp (use attenuators).
deleted - Page 1
Forum section: electronics / testgear

author: PeDre
author_rank: Contributor
timestamp: June 29, 2015, 09:47:32 pm
content: .

author: tomas123
author_rank: Frequent Contributor
timestamp: June 30, 2015, 10:28:32 pm
content: Which software do you use for the thermal images?

author: marshallh
author_rank: Unknown
timestamp: July 01, 2015, 12:08:30 am
content: Pretty neat panorama. Looks like the adc gets the hottest.

author: Muxr
author_rank: Super Contributor
timestamp: July 01, 2015, 03:22:35 am
content: Quote from: marshallh on July 01, 2015, 12:08:30 amRigol overclocked it too I believe?