hybridfree/eevblog-posts huggingface dataset:
Keysight U1177A Bluetooth adapter. - Page 1
Forum section: electronics / testgear

author: shteii01
author_rank: Frequent Contributor
timestamp: July 09, 2017, 11:28:22 pm
content: This is for Win/Androide.Is 34 USD + 10 USD shipping a good price?

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: July 10, 2017, 11:53:36 am
content: Be careful! The U1177A works with Windows and Android vs the U1117A which is for iOS as well. The U1177A is therefore much cheaper. Corrected what works with what.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: July 10, 2017, 12:35:26 pm
content: The only reason you need the 1117 is for iOS. The 1177 works with Windows.

author: BravoV
author_rank: Super Contributor
timestamp: July 10, 2017, 12:58:10 pm
content: Also the bluetooth range, by design the U1117A range is 100 meters, while U1177A is 10 meters.

author: shteii01
author_rank: Frequent Contributor
timestamp: July 10, 2017, 03:59:01 pm
content: Thank you all for looking out for me. I am well aware of OS and distance features. Like someone pointed out in Ebay U1252B thread, I can make a wireless kit by getting this cheaper bluetooth unit and pairing it with cheap android tablet, and the total will still be less then more expansive iOS unit.So. U1177A. The Keysight has them for 51 USD. Amazon have them for 46 USD. I found a place where I can get them for 34 USD, but with shipping it will be almost same as Amazon, however, that is per one unit. I have two multimeters, so I will be buying two which will negate shipping cost so I am looking at price that, in the end, will be below Amazon. The question is. Should I go for it or is there something better out there? Black Friday deal? Christmas special? I can wait, there is no hurry.

author: LaurentR
author_rank: Frequent Contributor
timestamp: July 10, 2017, 05:16:13 pm
content: If you live in San Jose, CA, you can get the last one on sale from Fry's at $29:http://frys.com/search?search_type=regular&sqxts=1&cat=&query_string=u1177a&nearbyStoreName=falseNo shipping

author: shteii01
author_rank: Frequent Contributor
timestamp: July 10, 2017, 05:45:52 pm
content: This is not going to work since I am in the middle of corn fields in Indiana.Quote from: LaurentR on July 10, 2017, 05:16:13 pm

author: colorado.rob
author_rank: Frequent Contributor
timestamp: July 10, 2017, 05:53:31 pm
content: Folks in San Jose can be making some money on the o'l Indiana cornfield arbitrage.

author: LaurentR
author_rank: Frequent Contributor
timestamp: July 14, 2017, 05:01:13 am
content: Quote from: colorado.rob on July 10, 2017, 05:53:31 pmThey have 2 of them in San Jose. I am a rich man.
TTi TF930 Freq. Counter - calibration details ? - Page 1
Forum section: electronics / testgear

author: thomas007
author_rank: Newbie
timestamp: July 12, 2017, 06:28:39 pm
content: Hello,can some please tell me the details of calibration ? Manual says it's easy but not how exactly to do it. It should be explained in servic manual but I could so far not find a download source.Thanks,Thomas

author: 2N3055
author_rank: Super Contributor
timestamp: July 12, 2017, 06:38:14 pm
content: Thomasdoes this help?Regards,Sinisa

author: thomas007
author_rank: Newbie
timestamp: July 12, 2017, 06:41:56 pm
content: Yes thanks alot

author: Gertjan
author_rank: Frequent Contributor
timestamp: July 12, 2017, 06:56:43 pm
content: Hi Thomas,In my experience TTi are nice people.Just mail them, and ask them.....regards, Gertjan
Analog multimeters and zeroing out - Page 1
Forum section: electronics / testgear

author: kalel
author_rank: Frequent Contributor
timestamp: July 12, 2017, 06:31:27 am
content: The zeroing out for reading resistance is said to be because of the battery voltage changing (I've read this in a few places already).If this really is the primary cause, well, what if we used a circuit that stabilizes the input voltage? Are there other factors except the voltage that would still require re-calibration?If it would be difficult to stabilize the battery voltage for some reason, for this question I guess we could imagine it was hooked up to a stable power supply instead of a battery (although then there might be issues for certain usage cases with the PSU being grounded, but let's just say there's a stable input voltage, whatever the method might be).Perhaps this would better fall into the beginner section, but it is test equipment related - so I wasn't sure. In any case, I'm sure there are people here who understand analog meters thoroughly and would know if such a thing would reduce the need for re-calibration (or is it alignment?).

author: Unknown
author_rank: Unknown
timestamp: July 12, 2017, 08:30:06 am
content: Different ranges sometimes use different voltages (e.g. 1.5V for low ohm ranges, 9V for higher ohm ranges), so it still needs some measure of re-zeroing when switching ranges. Other than that, I find my good analog meters to have a pretty stable zero with fresh batteries.There would likely be small variations with temperature just given the way most of them are constructed but I have no idea if it would be perceptible.

author: alm
author_rank: Super Contributor
timestamp: July 12, 2017, 09:03:16 am
content: My experience with analog meters is limited to some low-end panel meters, but is the zero setting on an analog meter not a mechanical correction that sets the spring tension? I seem to recall the zero setting changing slightly if the orientation of the meter is changed. I also imagine it changing with temperature. If that is true, then there is more to worry about than just the stability of the voltages. Even with its inputs shorted you could see some variation in zero setting.

author: Unknown
author_rank: Unknown
timestamp: July 12, 2017, 05:34:50 pm
content: Quote from: alm on July 12, 2017, 09:03:16 amOh, for analog ohmmeters, there are essentially two zeroes:There is the mechanical zero you mention which adjusts the zero of the physical movement when no current is flowing through it.There is also an electrical zero (potentiometer) which you generally check when starting a resistance measurement. You start by selecting the range of ohms you want to measure, short out the leads, and adjust the meter to zero. Every time you switch to a new ohms range it is a good idea to re-check / re-set the electrical zero.See the "zero ohms" knob on theSimpson 260below:
Adaptive Power Systems mystery meat - Page 1
Forum section: electronics / testgear

author: fcb
author_rank: Super Contributor
timestamp: July 11, 2017, 07:36:41 pm
content: I just acquired (in a job lot) a rather hefty looking Adaptive Power Systems 375VDC 13A variable PSU. I've googled the "TSDiii375-13" written on a rear label.However not able to find any info on this? Any ideas?

author: Fsck
author_rank: Super Contributor
timestamp: July 11, 2017, 08:21:27 pm
content: have you tried contacting the manufacturer? they still seem to be up and about.

author: casinada
author_rank: Frequent Contributor
timestamp: July 11, 2017, 09:23:37 pm
content: Is that on top of a Fluke 5100 ?

author: fcb
author_rank: Super Contributor
timestamp: July 11, 2017, 10:22:52 pm
content: @Fsck - yes, no reply yet.@casinada - yup 2x5100A and a 5215A

author: fcb
author_rank: Super Contributor
timestamp: July 12, 2017, 04:39:28 pm
content: Spoke with Caltest/Adaptive in the UK. They identified the unit as an Adaptive badged TS series 5KW unit from Magna.http://www.magna-power.com/products/programmable-dc-power-supplies/ts-seriesApparently worked perfectly when it left them - I took the lid off to see if it was simple to configure it as single phase, but my brain started hurting - so I took a couple of pix and screwed the lid down. I will put it on a three phase supply later this week and test it into some dummy loads we use for discharging a submarine battery. If anyone needs a 5KW beast (must have three-phase!) for PSU development, servo drives, electroplating, etc... I'm open to offers!
Data Precision 3600 DMM - Page 1
Forum section: electronics / testgear

author: halexa
author_rank: Regular Contributor
timestamp: March 31, 2016, 06:20:25 pm
content: Hi,Does anyone have the specifications or the manual for Data Precision 3600 DMM?

author: switcher
author_rank: Regular Contributor
timestamp: July 10, 2017, 06:29:12 pm
content: Very good meters, I used to have one. I may have some info, I'll have a look.Bear in mind, that ACV and Ohms were options; the 'basic' meter was DCV only. The options fitted will be ticked-off on the back. If you meter displays -ERR- in either ACV or Ohms; that option is not fitted.

author: orin
author_rank: Frequent Contributor
timestamp: July 12, 2017, 03:44:49 am
content: I have one of these. Don't know why. I struck out on finding the Instruction Manual online, but...Tucker had the Instruction Manual, so I put in an offer on their last copy and it's on its way to me.Once it gets here, I'll see about making a scan available.
metex ms-9170 - Page 1
Forum section: electronics / testgear

author: michael ludicke
author_rank: Newbie
timestamp: July 12, 2017, 06:22:52 pm
content: hi alli am new here so not sure if anyone can help? i have a Metex ms-9170, the one with the led DMM. When i have it in resistence auto range mode and try to do a continuity test the unit locks up and i have to powercycle it to work normally again, it does not seem to happen when in manual range mode as long as i dont use the lowest setting, the readings do seem to be acurate enough but it also seems to have problems with voltages in autorange mode and mesuring very low voltages, could this be an issue with the MAX134 chip or the NEC D78F0058GC cpu?i would be happy to replace the whole DMM if i could get one but there is no mention of any available in europe with only whole units on Ebay for a whole lot of cash. the part number on the main DMM board is metex 040731.h ms 9170 dmm ver.2any help will be kindly accepted

author: coromonadalix
author_rank: Super Contributor
timestamp: July 13, 2017, 02:08:44 am
content: Check this thread and try to contact Fraser ...https://www.eevblog.com/forum/reviews/metex-universal-combined-test-instrument-systemsstations-a-look-inside/

author: alm
author_rank: Super Contributor
timestamp: July 13, 2017, 03:31:48 am
content: That thread is mostly about the MS9150/60. The main difference between the 9160 and 9170 is the DMM, so that may not be that helpful. Of course it would not hurt to check the MS9160 schematic from that thread, but it would not surprise me if the DMMs of the 9160 and 9170 have little in common.I am not aware of any schematics for the MS9170, but that does not mean they do not exist. It may be that it closely follows an application schematic that may be shown in the MAX134 datasheet. Otherwise you will have to troubleshoot it without schematics. Start with the obvious stuff like dodgy connections and unstable / wrong power rails.
Voltage drop - Page 1
Forum section: electronics / testgear

author: netdudeuk
author_rank: Frequent Contributor
timestamp: July 11, 2017, 09:12:27 pm
content: HiI bought a UT139C and I've been very pleased with it so far.I did notice though that it shows about 4mV less that what I program into my Rigol DP832 PSU.It is pretty much the same if I set the PSU to 15mV or 555mv.We also bought another UT139C and that shows the same readings.Is it the leads causing the voltage drop ?Or maybe the DP832 is slightly out ?Thanks

author: Rbastler
author_rank: Frequent Contributor
timestamp: July 11, 2017, 09:34:16 pm
content: The UT139C is less accurate, than the DP832. +-0.5% on DC Volts on the UT139C, compared to +-0.05% on the DP832. So the "faulth" is with the UT139C.With only the DMM as a load, there won't be any significant voltage drop across the leads.

author: alm
author_rank: Super Contributor
timestamp: July 11, 2017, 09:49:00 pm
content: DP-832 programming accuracy is 0.05% + 20 mV, so if you set it to 555 mV, the true value should be between 535 mV and 575 mV. If you consider the readback accuracy (i.e. the actual value as opposed to the set value), the true value should be between 545 mV and 565 mV. The UT-139C in its 600 mV range has a rated accuracy of 0.5 % + 0.2 mV, so if it displays a value of 551 mV, the true value would be between 548 mV and 554 mV.So for a true value between 548 mV and 554 mV, both the DP-832 and he UT-139C would be in specifications if they display a value of 555 mV (for the DP-832) and 551 mV (for the UT-139C). So I see no reason to doubt the accuracy of either instrument based on the data you provided.

author: The Soulman
author_rank: Super Contributor
timestamp: July 11, 2017, 09:54:13 pm
content: Yes, however with two multi meters showing the same behavior, a offset of 4 mV, its most likely the rigol.

author: alm
author_rank: Super Contributor
timestamp: July 11, 2017, 10:13:55 pm
content: Assuming the error of the UT-139C is completely random, then sure. However, if they came from the same factory (likely), possibly even from the same batch, you might expect the errors to be highly related. The only way to be sure is to compare with a more accurate instrument, ideally with traceable calibration before and after the measurement.
Test/review of Zhurui Power Recorder PR10 - Page 1
Forum section: electronics / testgear

author: HKJ
author_rank: Super Contributor
timestamp: May 14, 2017, 10:03:31 am
content: Full review is here:http://lygte-info.dk/review/Power%20Zhurui%20Power%20Recorder%20PR10%20UK.htmlI decided (was asked by a reader) to take a closer look at this power monitor.It is measuring power and can calculate cost.It stores daily energy consumption and can show them as a chart or a list.Precision is good also at low power levels.A look insideConclusionIt is an impressive little meter.It can be discussed if it have to many functions, but the user interface makes it fairly easy to get around in all the settings and functions. Some settings requires a bit of work to adjust, but it is acceptable.

author: BravoV
author_rank: Super Contributor
timestamp: May 14, 2017, 11:13:56 am
content: As usual, thanks HKJ.Interesting piece of gadget, price wise is also not that bad. Now its in my wish list, its your fault.

author: Scutarius
author_rank: Regular Contributor
timestamp: July 11, 2017, 05:11:16 pm
content: Thank you, I was looking for an inside view, it seems pretty good.I am going to modify the case for wall mount for my water pump consumption monitoring
Tenma 72-10510 problem - Page 1
Forum section: electronics / testgear

author: THORs_Hand
author_rank: Contributor
timestamp: July 10, 2017, 06:50:50 pm
content: Hello everyone, i just got today a Tenma 72-10510 25MHz 250MS/s oscilloscope, it was brand new, in sealed box, no signs of physical damageI turned it on for the 1st time and the front panel wasn't working, i did some chat with a friend of mine and got to the point where i pressed and held F5 at startup before the pwr button and worked for some time, i rebooted a couple times, and worked without pressing the F5 key, how i tured it off for ~5m and doesn't work again, the F5 trick doesn't workOpened it up and it was completly clean inside, no dust or something like that, all the cables were properly plugged inAny advice on what could i do?I suspect some software issue in wich it doesn't load the front panel drivers(It always works via USB control, it came with a software CD but to have a PC just to control the scope, it's too hard, it has tons of lag btwn the click and the processed command)
Using a HP6633A/6634A power supply as an electronic load? - Page 1
Forum section: electronics / testgear

author: carl_lab
author_rank: Frequent Contributor
timestamp: July 10, 2017, 11:40:43 pm
content: I found info here:http://www.rainer-foertig.de/td/HP663xA.pdfQuoteDoes that mean if I set/program it for example to 50V/1A the power supply provides 50V/1A AND sinking current up to (-)1A if I externally force the output voltage higher than 50V?My idea is using the HP6633A/6634A for charging lithium batteries by CV/CC characteristics (nominal 50.4V/1A) and then test the batteries by discharging them CC down to (lower) discharge end voltage (36V), while measuring time to calculate battery capacitance.What do you think, is that a good or bad idea?Any measures required to protect the PS?

author: alm
author_rank: Super Contributor
timestamp: July 10, 2017, 11:59:08 pm
content: Yes, the HP/Agilent/Keysight 663x series can sink current like an electronic load. I would add a fuse between power supply and batteries, and would not exceed the maximum output voltage of the power supply (so for the 50.4 V load I would use a 6634). I also seem to recall that you have to disable the overvoltage crowbar circuit by cutting an internal jumper. This overvoltage crowbar may protect the load of the output transistor in the power supply short, but may also short a battery if the voltage gets too high.Also in the case of the 663xA, the sink current is 0.25 greater than the set current, so in your example it might sink up to 1.25 A.Some previous discussions of this topic:https://www.eevblog.com/forum/testgear/hp-6632a-negative-constant-current/https://www.eevblog.com/forum/testgear/current-sinking-in-hp-6632a/
DSO 5072P input stage problem - Page 1
Forum section: electronics / testgear

author: YannickF
author_rank: Newbie
timestamp: July 08, 2017, 09:19:46 am
content: HelloI think I burnt the input stage on my oscilloscope this morning.I was looking for the pulse output (in order to build a tachometer) on a motorcycle alternator, and maybe too high voltage was applied.Actually, both CH1 and CH2 are OK (tested with 5V 1Khz output) but they don't work at all if I choose 5V/div sensitivity. (Signal stay on 0V)Which component(s) may have been killed ?Regards

author: homeboy
author_rank: Newbie
timestamp: July 09, 2017, 09:39:24 pm
content: Directly go to this website: "www.eediscuss.com" to bring up your question. May be technical support can give you a hint.
clamp meter with option to measure current via test leads? - Page 1
Forum section: electronics / testgear

author: koniu
author_rank: Newbie
timestamp: July 10, 2017, 12:00:56 am
content: Hi meterheads, a leisure/houseboat electrician, a long term peruser and first time poster here.On a crazy quest to carry as few tools as possible I'm looking for an affordable test tool that would allow easy measuring of current with a clamp but also more precise current tests with probes.The basic features required are:- DC current clamp up to 400A minimum- DC current test leads up to 10A minimum- continuity buzzer- standard DMM features (AC/DC voltage, resistance, etc)- not mad expensiveNice to haves:- Hz- automotive functions- backlight- RMS- NCV- torchesBasically I would like something like Uni-T UT216C (or D) but with an option to measure current via probes. As an alternative, could a reliable DMM with a probe attachment be an option?Thanks for any pointers or recommendations!

author: BravoV
author_rank: Super Contributor
timestamp: July 10, 2017, 12:21:07 am
content: Why you need to make 2nd identical thread ?https://www.eevblog.com/forum/testgear/clamp-meter-with-option-to-measure-current-via-test-leads/

author: Simon
author_rank: Unknown
timestamp: July 10, 2017, 05:55:19 am
content: Topic locked, please respond to the one linked by Bravo, please do not double post, it irritates people and causes confusion.
Datron 4808 damaged front panel and missing button - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: July 09, 2017, 03:59:12 pm
content: I recently acquired a fully loaded 4808 which I got onto the bench today (with some assistance).As you can see the front panel is rather bashed up:any advice on how best this can be repaired will be most welcome.It's also missing the calibration key and the cap for the Current switch (with legend "I").Can anyone help with either of these?Thanks, Dave

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: July 09, 2017, 05:29:12 pm
content: Dave,Mine also came in damaged, but not to that extent. I lost all the buttons off of the front but they were easily reinistalled. There are two that were already missing. I have cracks at the corners of the front cover. I have considered a good plastic epoxy like JB Weld plastic bonder. It may not work well in the cracks but I have used it to repair a broken knob. I built up the area around the cracks and a small amount of superglue to hold the broken pieces together. My concern with the front cover was that the superglue could form a haze over the bezel so some painters tape probably would need to be added.There isn't a lot of room in the corners due to the way it fits over the top/bottom covers.I have a key for mine. It isn't original but a mistake that didn't fit my 4700. It turns just fine in the 4808 so no money was lost. If you need a key made, let me know. It is different than the one used in my 1281.
HP 4815A Vector Impedance Meter - Page 1
Forum section: electronics / testgear

author: johnny_canuck
author_rank: Contributor
timestamp: July 15, 2017, 01:38:41 am
content: This device performs well except for an intermittent SEARCHING light coming on.I've fed in an external oscillator signal, but get the same result. The PLL circuitry is the problem.I've reseated cards and reheated solder joints without success. Anyone had any experience with these oldies? Thanks.Ken
clamp meter with option to measure current via test leads? - Page 1
Forum section: electronics / testgear

author: koniu
author_rank: Newbie
timestamp: July 09, 2017, 05:02:14 pm
content: Hi meterheads, a leisure/houseboat electrician, a long term peruser and first time poster here.On a crazy quest to carry as few tools as possible I'm looking for an affordable test tool that would allow easy measuring of current with a clamp but also more precise current tests with probes.The basic features required are:- DC current clamp up to 400A minimum- DC current test leads up to 10A minimum- continuity buzzer- standard DMM features (AC/DC voltage, resistance, etc)- not mad expensiveNice to haves:- Hz- automotive functions- backlight- RMS- NCV- torchesBasically I would like something like Uni-T UT216C (or D) but with an option to measure current via probes. As an alternative, could a reliable DMM with a probe attachment be an option?Thanks for any pointers or recommendations!

author: Fungus
author_rank: Super Contributor
timestamp: July 09, 2017, 05:20:26 pm
content: Quote from: koniu on July 09, 2017, 05:02:14 pmFor small currents, just make a double-ended multimeter probe lead and pass it through the clamp.For large currents, well ... use a clamp. There's a good reason why must multimeters stop at 10A (and even then it's only for a very limited time, eg. 10s)https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg1252354/#msg1252354Quote from: koniu on July 09, 2017, 05:02:14 pmThere are multimeters with clamp option, yes.
rigup error with MSO1104Z-PLUS - Page 1
Forum section: electronics / testgear

author: gmebey
author_rank: Newbie
timestamp: June 29, 2017, 02:28:10 am
content: I finally had some time to take a shot at unlocking my MSO1104Z-PLUS scope.The memory dump went well, thanks for all the post out there about using the JTAG port to dump the memory.However when I when to use rigup to view the commands I ran into an issue, and got the following error:gerald@gerald-Vostro-200:~/rigup-0.4.1$ ./riguprigup: src/encode.c:20: EncodeSignature: Assertion `sig <= 0x0fffffffffffffff' failed.Aborted (core dumped)gerald@gerald-Vostro-200:~/rigup-0.4.1$My scope info:1) The header was NOT loaded, and I had to add it.Model: MSO1104Z-SS/N: DS1ZD1819xxxxxFirmware: 00.04.03.SP2Hardware: 6.1.4A couple questions:1) Where can I get a complete install for rigup, I'm running Ubuntu 14.04.2) An easier option is if someone would crack the Memory Dump file for me.Thanks,Gerald

author: gmebey
author_rank: Newbie
timestamp: July 09, 2017, 08:55:44 am
content: Update:After some research I found out that the error was related to an issue with the MakeFile.Error in MakeFile on line 8Original is "LDFLAGS := -O2 -Wl,-dead_strip"Change to "LDFLAGS := -O2"serendipity make a comment in a post about a bad configuration in the MakeFile.See Post
UNI-T UT139C - all genuine ? (and mV accuracy) - Page 1
Forum section: electronics / testgear

author: netdudeuk
author_rank: Frequent Contributor
timestamp: July 05, 2017, 07:50:03 am
content: HiHas anyone heard of fakes ? Or are some sellers just offering them ten percent cheaper than everyone else to get the sales ?Thanks

author: myf
author_rank: Regular Contributor
timestamp: July 05, 2017, 10:23:42 am
content: Hello,Last month I bought a uni-t ut-61e multimeter for its usb/rs232 link and its 20,000 counts on ebay (after the all over the world choice).I bought it to "aonehere1997" seller for 41.99eur in France and I get it without any problem 20 days later.Perhaps, It's not the lowest price but one of the lower and it's all right."aonehere1997"http://stores.ebay.fr/zibootool/sells a lot of uni-t multimeters.Have a nice day and a good choice !F. from France.

author: nanofrog
author_rank: Super Contributor
timestamp: July 05, 2017, 11:14:31 am
content: Quote from: netdudeuk on July 05, 2017, 07:50:03 amIn terms of fakes, there aren't any that I'm aware of.FWIW, I paid slightly under $36 shipped for mine.

author: netdudeuk
author_rank: Frequent Contributor
timestamp: July 08, 2017, 02:57:50 am
content: I bought one and I'm very pleased with it so far.I did note though that I'm always about four mV down on the mV range when connected to my Rigol DP832.That's regardless of how many mV I select. It could be ten or it could be 125. The same or so drop.What's likely to be causing this ?Thanks

author: Nusa
author_rank: Super Contributor
timestamp: July 08, 2017, 05:35:52 am
content: UNI-T is a Chinese company. I wouldnt expect Chinese cloners to find them a good target, either from the money (lower profit margins than other brands) or higher risk (legal system used by insiders) points of view.
Rigol DS1054Z Enhancements - Page 1
Forum section: electronics / testgear

author: danadak
author_rank: Super Contributor
timestamp: July 07, 2017, 12:48:26 pm
content: Not sure if someone has already covered this but I would likeadded into firmware -1) Start by allowing user in very large font to put at least onemeasurement on the screen, filling the screen, or 1/2 screen,so can be read across the room. Seems like all the singlemeasurements could be done this way with a simple routine.Font size controlled by user, routine handles display andcentering. Screen is large enough even 2 measurements thisway quite useful.Part of this would be an auto scaling function to keep themeasurement in range while working across the room. Thiswould be applied if measurement overlayed on top of normalscope trace screen. So trace vertical sensitivity always keepingtrace size visible.2) Chart recorder function coupled with PC API. There are timesI need to look at very slow rate events, circuits, that want stripchart like functionality.Regards, Dana.

author: sokoloff
author_rank: Super Contributor
timestamp: July 07, 2017, 01:59:53 pm
content: #2 is probably do-able today. There is an ethernet port and you can ssh (or maybe it was telnet) into the scope.https://www.rigolna.com/products/digital-oscilloscopes/1000z/has a downloads section for drivers and software to allow you to control the scope from your PC. (I've only done the connection for the purpose of installing upgrades and taking a screenshot, but I'm >99% sure you can get measurement data out of it as well.)

author: sokoloff
author_rank: Super Contributor
timestamp: July 07, 2017, 02:01:50 pm
content: Sorry. Make that 100%.Here's the programming guide:http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-0386/1/-/-/-/-/DS1000Z_Programming%20Guide_EN.pdf

author: ebastler
author_rank: Super Contributor
timestamp: July 07, 2017, 02:07:51 pm
content: I'd recommend using the "official" bug/wishlist thread for this type of suggestion:https://www.eevblog.com/forum/testgear/rigol-ds1000z-series-buglist-continued-(from-fw-00-04-04-03-02)/
Rigol DS1000D/E/U firmware update - Page 1
Forum section: electronics / testgear

author: borjam
author_rank: Unknown
timestamp: July 07, 2017, 10:03:37 am
content: I've developed the habit of checking Rigol's website for updates periodically (I own a DS1074Z) and I've noticed what seems to be a firmware update for the DS1000D/E/U.It says Firmware_00.04.02.01.00, dated 2017-07-17(obviously a typo, someoned typed "1" instead of "0").http://int.rigol.com/Support/SoftDownload/3
Agilent 66311D and the Agilent AN 1427 application note - Page 1
Forum section: electronics / testgear

author: bushjavier
author_rank: Newbie
timestamp: July 06, 2017, 10:23:56 pm
content: Can i use the 66311D as a zero ohm shunt resistor as described in the Evaluating Battery Run-down Performance application note? i will read the current using SCPI commands. I will build the protection circuit as described in the application note.I ask this question because the application note do not mention the 66311D anywhere.Link of the application note:http://literature.cdn.keysight.com/litweb/pdf/5988-8157EN.pdf?id=131697Thanks!Javier

author: alm
author_rank: Super Contributor
timestamp: July 06, 2017, 11:45:26 pm
content: Programmable output resistance is not available on the 66309/66311 series as far as I know (unless it is a hidden feature). So you would not be able to compensate for wiring resistance like with the 66319/21. I do not know if the impedance would still be lower than the traditional shunt. If you want a zero Ohm shunt, than a feedback ammeter might be an alternative solution (they will not compensate wiring resistance). Most of them are made for lower currents than the 66311 can handle, however.

author: pigrew
author_rank: Frequent Contributor
timestamp: July 07, 2017, 02:41:04 am
content: The 66309/66311 cannot stream data back to the computer. I believe that the later models added streaming capability, so the record could be continuous. Also, the 66309D does instantaneous sampling (instead of integrating the current over a long period). The sampling period can be set as low as 15us with 4096 samples in a row (about 63ms total). Then, you can acquire the mean if those samples without downloading each sample. The sample rate can be nearly continuously varied. You would lose any current consumption data between acquisitions, but unless there are out-of-family pulses happening I those times, it'd be ok (just assume the current remained constant during the missing periods).You probably could add a capacitor (check documentation for stability concerns first) to smooth out the pulses to make them low enough frequency to sample.I started to write some control software for the power supply (Microsoft Windows based), but it's pretty buggy and doesn't have the features you need, but could potentially be helpful for you.
Looking for Keithley CS-846 connector - Page 1
Forum section: electronics / testgear

author: Magnum
author_rank: Regular Contributor
timestamp: May 17, 2015, 02:35:49 pm
content: Hello,I just bought a Keithley 2304A but unfortunately it comes without the connector for the test leads. Keithley part No is CS-846, but I assume that it is a "standard" part. Does someone know where to get one (besides Keithley)?Here is a picture of it, it has 8 positions with screw terminal.Thanks.

author: radioFlash
author_rank: Regular Contributor
timestamp: May 17, 2015, 02:55:20 pm
content: It looks like something from Phoenix Contact, maybe something like this part number 1795611?https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetail:pid=1795611&library=usen&pdfmode=direct&pdflanguage=enYou can try searching Mouser:http://www.mouser.com/Phoenix-Contact/Connectors/Terminal-Blocks/Pluggable-Terminal-Blocks/COMBICON-Control/COMBICON-Control/_/N-7rqe3?P=1z0zljmZ1yxwyidZ1z0x3za

author: Magnum
author_rank: Regular Contributor
timestamp: May 17, 2015, 05:53:40 pm
content: Thank you very much, it seems that this one will fit.

author: kandrey89
author_rank: Contributor
timestamp: July 06, 2017, 05:01:28 pm
content: Can you confirm if that part is an exact match or did you end up buying something else?

author: merox
author_rank: Regular Contributor
timestamp: July 06, 2017, 06:17:13 pm
content: The one linked above seems to fit, but it's a more expensive EX-rated version for use in HazLoc. I would doubt that Keithley went for that one.It's more likely to be a standard MSTB 2,5/ 8-STF-5,08:https://www.phoenixcontact.com/online/portal/us/pxc/?uri=pxc-oc-itemdetail:pid=1778043&library=usen&pcck=P-11-02-11&tab=1Unfortunately you can't compare the pictures directly, it seems like Keithley got the picture directly from an old Phoenix Contact catalog (the pictures in there looked liked that in the late 90ies / early 2000s). The current catalogue pictures are a bit different.

author: kandrey89
author_rank: Contributor
timestamp: July 06, 2017, 09:30:49 pm
content: I guess 1757077 will work just the same, it doesn't have the screws but that's OK.https://www.digikey.com/product-detail/en/phoenix-contact/1757077/277-1017-ND/260385
Advantest R4131 Help please  - Page 1
Forum section: electronics / testgear

author: Deltatango
author_rank: Newbie
timestamp: July 06, 2017, 12:29:07 am
content: I have an old Advantest R4131 which is being tidied up, replacement of tarnished sockets and now I have resolved that switches issue (bit of a labour of love) it has, with things are going well but, yes but, one problem remains on the board behind that switch panel are two bussed networked resistors (R2 + R3) these have been fitted by six individual resistors of 20% @ 100K and do not fit in with the rest of it!Could a person tell me please what their listed value is meant to be, I have downloaded a Operating/Service manual which has some information that shows a typical switch/diode layout which is the actual switch panel but not this one which has 14 logic IC's fitted and lives just behind.Did write a nice email to Advantest but no joy in fact it gave me the feeling of writing an apology letter to my family a bit of hair and...................!Also if anyone can point me to any other circuit extracts that would be great like its monitor section.Thank you for any help from David
VC830 Diode Dropout Voltage - is my unit faulty or is this a general issue? - Page 1
Forum section: electronics / testgear

author: tzok
author_rank: Regular Contributor
timestamp: October 02, 2016, 10:14:29 am
content: I've found a bug in the diode test of my Voltcraft (Conrad) VC830. Diode voltage dropout is measured accurately up to about 2.3V, but above that readout starts to raise rapidly, and on 2.5V it reaches 6V and display says OL. I wonder if only my unit is faulty os is it a general issue of this meter?These videos illustrates the issue:Voltage dropout measurement of red and then blue LED in turns - first on UT139C, then on VC830:UT139C measures voltage across test leads of VC830, which is set to diode test, and again red and blue LEDs are measured:Setup like above, but instead of LEDs a 47k potentiometer is connected:When I think about it I came to idea that there must be some kind of comparator circuit, which switches the input of voltmeter (which on diode tester is on 6V range) to Vcc, in order to display OL when leads are in open circuit. This should happen near the test voltage (which is supposed to be 3.7V, while in fact it is about 3,3V - this can be observed in the second video, when nothing is connected to the test leads of VC830), but for some reason takes place nearly 1V below it (2.3V instead of 3.3V).I've also checked two other DMs:UT139C (6000 count) - diode test voltage = 3.2V, OL @ 3.000V+1LSDUT33A (4000 count) - diode test voltage = 1,4V, OL @ 0.999V+1LSDBoth measure accurately up to OL threshold and switch to OL on change by 1 least significant digit.P.S.This 6000 count multimeter actually can display a readout like 6.015V, and not only on diode test.

author: cjs
author_rank: Contributor
timestamp: July 05, 2017, 07:11:18 pm
content: For what it's worth, I just discovered today myself that the diode test setting is not just an "it's there or it's not" feature on multimeters. (Yes, clearly I'm a newb.)I recently picked up a Peak Meter 8233B (around $10 from China) and got pretty concerned when, though it would light up even blue and white LEDs, it wouldn't read the forward voltage of a red LED. (Later testing showed that two 1N4001 diodes in series is it's limit.) I have a $20 and a $25 meter as well, and both did fine with all LEDs.Now that I've read your post and confirmed that my $3 DT-830B (you know, that generic thing) has the same problem, this is pretty clearly not a defect in my particular meter, and is really a design thing. And my curiosity is tweaked because the cheap meters do light the LEDs, and measure 3.0 V across the open leads in diode test mode (as opposed to about 3.25 V for my better meters). So what's going on here?I guess my basic questions are: 1. How do meters test diodes, and 2. When is not being able to test diodes with forward voltage more than 1.5 V or whatever a problem?
Hp E5810A communication - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: July 05, 2017, 10:11:19 am
content: HelloHas someone seen how to communicate with a HP E5810A and which official software support the E5810A?Basic idea is to extend the linux-gpib functionality to be used as a LAN to GPIB gateway like the E5810A (o;

author: plesa
author_rank: Frequent Contributor
timestamp: July 05, 2017, 10:34:54 am
content: Check this threadhttps://www.eevblog.com/forum/metrology/raspberry-pi23-logging-platform-for-voltnuts/new/?topicseen#newIn Windows it is also easy and you needs manually configure IP address of E5810A.

author: alm
author_rank: Super Contributor
timestamp: July 05, 2017, 12:09:22 pm
content: As stated in the linked thread it uses the VXI-11 protocol, like some other GPIB-ethernet gateways like the older HP E2050a. Should be supported by thepython-vxi11andPyVISA-pypython modules. That should give you some pointers on the protocol if you want to re-implement the functionality in C (libgpib).About official software, I imagine the Agilent IO suite (maybe not the current version?) supports it.

author: Tony_G
author_rank: Super Contributor
timestamp: July 05, 2017, 06:57:08 pm
content: The current versions of the Keysight IO Suite do support this - I use one in my home lab and it works fine.If you want to start from scratch, the specs are herehttp://www.vxi.org/specifications.htmlTonyG
NLX motherboards on eBay (for Tek scopes) - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: July 05, 2017, 12:26:01 am
content: Take a look at the BIOS chip on the board on the left. WTF?http://www.ebay.com/itm/Intel-E139761-REV-A02-Socket-PGA370-370-ATX-Motherboard-Agilent-HP-/122582272555?hash=item1c8a790a2b:g:9hYAAOSw0j9ZXCt9Tested and working!(Not to mention that it's used in the Tek TDS6K, 7K, and 8K scopes, not Agilent, AFAIK.)
Agilent U1732C - ESR accuracy - Page 1
Forum section: electronics / testgear

author: zaoka
author_rank: Frequent Contributor
timestamp: July 09, 2017, 04:45:44 am
content: Can somebody explain ESR accuracy of this meter and why after performing Open/Short calibration meter still shows 0.036 with leads shorted? (its new meter)I am trying to test tantalum polymer capacitor that has 70mOhm ESRTHis is from the manual:"Equivalence Series Resistance (ESR) measurement is determined by impedance measurement and range. The maximumdisplay is up to 199.99 k? and the accuracy is (AZ + Offset) x ?1 + Q2"http://literature.cdn.keysight.com/litweb/pdf/5990-7778EN.pdf
Anyone have background information on a HP435B-H04? - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: July 05, 2017, 07:10:24 pm
content: Hi All,I picked up a bunch of instruments in an auction score recently and one of them I can't find anything on.It is a variant of the HP 435B Power Meter and is marked 435B-H04 on the front panel. In addition it has a custom "Special Dial" option C06 on it.While I'm familiar with the 435B (and other 43X series meters), I've never seen anything about this one and I'm trying to find out the history/reason for it (I suspect that it was designed/released for standards labs or pure metrology work as the cal factor dial is way more granular than usual on the 435B).Here are a couple of photos:Anyone know/seen of this designation before?Thanks,TonyG

author: alm
author_rank: Super Contributor
timestamp: July 05, 2017, 08:42:07 pm
content: Would the standards labs not have used a thermistor-based power meter like the HP 432 + 478 because of their ability to be calibrated at DC?I am not that familiar with the H prefix for options. Did it not refer to options that could only be obtained by directly ordering from the factory? In that case it could be some large customer that integrated them into a system.

author: Tony_G
author_rank: Super Contributor
timestamp: July 05, 2017, 09:07:27 pm
content: Thanks ALM - Appreciate the response.Quote from: alm on July 05, 2017, 08:42:07 pmDepending on the signal level I believe - The 478 & 8478 are limited to -20/-30 dBm - In any event cal labs certainly would have used these along with the 432s (standards bodies/national labs probably but I really don't know and I'm happy to be corrected).I don't know if the H series of options are factory customizations for large companies - I'm hoping that someone might have used these things in anger so I can get the background story on why it was built and who used it.TonyG

author: alm
author_rank: Super Contributor
timestamp: July 05, 2017, 09:26:14 pm
content: I checked some HP catalogs between 1981 and 1997 and the 435B manual, as I imagine you did (but it never hurts to describe it, so other people do not have to do the same), and found no reference to any H options for the 435 either. That to me supports the theory that the H04 option was not offered to the public, but only to specific customer(s). Similar to what Tektronix called 'modifications'. There might be a special datasheet / manual for that option, but good luck finding it.
I can not see the images in the topic. - Page 1
Forum section: electronics / testgear

author: Pippo
author_rank: Newbie
timestamp: July 02, 2017, 03:48:08 pm
content: Good morning, why can not I see the photos of this topic?When I was not registered in the forum I could see them.https://www.eevblog.com/forum/reviews/hewlett-packard-1980b-oscilloscope-teardown/

author: xrunner
author_rank: Super Contributor
timestamp: July 02, 2017, 03:56:58 pm
content: Quote from: Pippo on July 02, 2017, 03:48:08 pmBecause Photobucket changed their policies recently and no longer allows 3rd party hosted images unless you pay their ransom fee. It's caused massive problems for forums with photobucket images.

author: Pippo
author_rank: Newbie
timestamp: July 03, 2017, 03:10:38 pm
content: Thanks so much.
Reasonable memory size for an Arbitrary Waveform Generator? - Page 1
Forum section: electronics / testgear

author: egonotto
author_rank: Super Contributor
timestamp: June 09, 2017, 05:08:49 pm
content: Hello,How much memory is reasonable for an Arbitrary Waveform Generator?Is it useful to have memory in MB range or are some kB in most cases enough?Best regardsegonotto

author: egonotto
author_rank: Super Contributor
timestamp: July 03, 2017, 04:50:55 am
content: push

author: Berni
author_rank: Super Contributor
timestamp: July 03, 2017, 05:26:57 am
content: Depends completely on what you want to do. Since the waveform tends to be looped around on every cycle you don't need a lot of points to get a good looking waveform.Just reproducing something like a rectified 50Hz AC waveform is KB of memory. Playing back a complex modulated Q I data stream might need many MB
Keysight DSOX1102G Wavegen, training signals and .arb files? - Page 1
Forum section: electronics / testgear

author: dentaku
author_rank: Frequent Contributor
timestamp: July 03, 2017, 01:59:10 am
content: I see that I have an empty arb folder in my DSOX1102G scope's internal memory. There's no way of saving, recalling or creating custom .arb files with this scope and I can see why they would rather have you buy a more expensive scope to use this feature but it STILL would be nice if there was a way of using custom .arb files with an X1000 scope.The hardware is obviously capable of it because the test signals can do all kinds of fancy stuff but unfortunately you can't access those files to see what format they're in or where they're stored .I'd love to have the wavegen output stepped files such as 0V for 500ms, 83.3mv for the next 500ms, 166.6mv for the next segment, etc.BenchVue doesn't allow me to automate any of the features of the Wavegen either but if it did I could create a sequence of DC voltages which would do the same thing.I know it's asking for a lot from an entry level scope but I wondered if anyone else whished there was more control over the Wavegen in their DSOX1102G and if anyone was trying to look deeper into the files stored on this scope?
Fluke 8840a - AC voltage reading low - Page 1
Forum section: electronics / testgear

author: StlHifi
author_rank: Newbie
timestamp: July 01, 2017, 05:53:47 am
content: Got this meter off eBay with the cal button's sticker torn off.I plugged the probes into the 122 VAC wall, verified by my HP 3468b that is within spec. The Fluke read 133 mV! I tried calibrating ohms and DC volts, that worked well. I get "error 41" when I try to calibrate VAC using the HP as reference. I can calibrate the ohms and VDC just fine, after erasing the calibration. AC voltage remains elusive.What might be wrong, and what should I do? The self test is fine on the Fluke!

author: xwarp
author_rank: Frequent Contributor
timestamp: July 02, 2017, 03:04:23 pm
content: Pull the unit out if it's cabinet and make sure that you see a single wire, (I think it's a red wire), going from the AC board to the main board. If that is not connected, you won't get a reading. If it is connected, then you might have problems with the AC board.I think I have a spare board somewhere around that we might could work something out on.