hybridfree/eevblog-posts huggingface dataset:
Keysight U3401A &  Measuring Resistance of Inductive Part - Page 1
Forum section: electronics / testgear

author: dexters_lab
author_rank: Unknown
timestamp: May 06, 2015, 07:45:53 am
content: I saw something strange happen the other day, i was measuring he resistance of some of the windings on a transformer and it makes my Keysight U3401A DMM go all wonky after the measurement.I made a short video of it here;I would welcome any comments about it, is this something than can be expected to happen or does it indicate some poor design or a fault with my DMM?I have contacted Keysight, who have not responded yet.

author: Vgkid
author_rank: Super Contributor
timestamp: May 06, 2015, 08:00:26 am
content: I would second your thoughts on the inductive voltage spike. Though i would have figured that some relays would latch/ unlatch for the diode measurement. Then again it still sends a constant current through the diode and measures the voltage, most likely a few mA. Though for the voltage meaeurement probably starts at the high end and drops down in scale.

author: AndyC_772
author_rank: Super Contributor
timestamp: May 06, 2015, 08:25:14 am
content: Just tried a quick test using my Fluke 89-IV and Keysight 34465A to measure the resistance of a toroidal mains transformer's windings. The transformer is a Noratel TA050/12, which has 2x 115V primaries and 2x 12V secondaries.Across one primary, the Fluke reads 24.41 Ohms, which seems entirely reasonable to me. It reads the same in auto-ranging mode as in manual (500R range).If I set the Fluke to the 500k range, it reads -0.05k.On the 5M range, it reads -0.0009M, and on the higher ranges it reads zero as expected.The Keysight doesn't fare quite so well on auto-range. I get a reading that's not stable, but hovers around -0.0014M.In manual ranging modes, it works fine, and I read 24.4643 Ohms or thereabouts. I've no doubt the reading would be stable if I bothered to make a good, clean connection rather than just holding the probes against the transformer leads.Seems that auto-ranging might be confused by inductance?

author: dexters_lab
author_rank: Unknown
timestamp: May 06, 2015, 08:31:52 am
content: Quote from: AndyC_772 on May 06, 2015, 08:25:14 ami didn't show in the video as i wanted to keep it short but i get the same effect in manual ranging too, where after measuring i get a permanent offset until i change to volts and then back again

author: dexters_lab
author_rank: Unknown
timestamp: May 06, 2015, 11:13:02 am
content: just had a call from Keysight:basically, it's a known problem with this particular modelthey did suggest i upgrade to a better model, lol... well i guess they would!
Meegopad T01 Smallest Windows Pc Teardown - Page 1
Forum section: electronics / testgear

author: Kedar264
author_rank: Regular Contributor
timestamp: May 05, 2015, 01:26:18 pm
content: Intel are starting to make waves in the tablet space, with x86 processors appearing more frequently. Now, it’s starting to move into mini PCs. The combination of cheaper Intel chipsets and Windows licences has bred devices like the MeegoPad T01. The MeegoPad T01 is a Intel Bay Trail-powered Atom PC with the familiar “Android Stick” form factor. Armed with a quadcore 1.33 GHz processor, this tiny stick is capable of running both Android 4.4 and Windows 8 in a dual OS configurationThis is a very exciting product as it combines cheap hardware and the allows you to run Windows which eliminates many of the limitations with Android-based devices such as getting the right drivers for peripherals. Additionally, getting Netflix and other streaming apps working should be much easier, as often embedded platforms don’t always support the required DRM. It’s also capable of loading Android 4.4.2.Whilst the Atom Z3735F isn’t necessarily the fastest chip around, it should be ideal for handling XBMC/Kodi, media playback, web browsing and even some light gaming. You can see CPUBoss’ benchmarks here.The inclusion of a power button is a small thing but something that I find very exciting as I don’t always like having my media players running all the time so this addition is incredibly welcome and strangely rare in the Mini PC world.I personally want to get my hands on a MeegoPad T01 as I love the idea of having a tiny Windows media center that I can take around with me.MeegoPad T01 SpecificationsChipset: Intel Atom Z3735F “Bay Trail” quad core processor @ 1.33 GHz (Bust freq: 1.83 GHz) with Intel HD graphics Gen 7 (2W TDP)RAM: 2 GB DDR3L-1333 (64-bit up to 10.6 GB/s)Storage: 16 or 32 GB eMMC + micro SD slot up to 64GBVideo & Audio Output: HDMI 1.4Connectivity: 802.11 b/g/n Wi-Fi and Bluetooth 4.0 (Realtek RTL8723BS)USB: 2x micro USB ports, 1x USB 2.0 portOther Features: Power buttonOS: Windows 8/Android 4.4 (Dual Boot)#Instructibales (High Resolution Photos)http://www.instructables.com/id/Meegopad-T01-Smallest-Windows-Pc-Teardown/# See Teardown Herehttps://youtu.be/Aus1qk793so

author: dadler
author_rank: Unknown
timestamp: May 05, 2015, 05:23:20 pm
content: Nothing personal-but this isn't test equipment.Shouldn't this go in a different section?
Rigol DS2072A long memory samples download to PC - Page 1
Forum section: electronics / testgear

author: TizMor
author_rank: Newbie
timestamp: June 13, 2014, 04:34:03 am
content: Hi gents,before buying this Rigol, I was looking for the way to save to a PC file an acquisition made of the full 14M samples. Probably who owns it knows it!Which is the right software?Which is the file format? (I assume wfm... am I right?)How long it will take using USB and LAN?How long it will take by using Ni-Visa APIs?As reference, my current Owon SDS7102:- uses its crap remote control software- transfers 10M x 2 samples in ~3s by USB (excellent!)- freezes by using LAN, and it takes ~10s to transfer 1M x 2- USB drivers not tested but they are documented and they should work... at least their software made them work great- SCPI seems not to be implemented, at least it doesn't reply to any command except the SCPI enableThanks for any feedback!T

author: damago1
author_rank: Newbie
timestamp: May 05, 2015, 11:40:13 am
content: Hi,You can try this:http://ogrodowa.gosiewski.pl/publish/OscilloscopeCompanion/It was designed for work with DS1000z scopes but should theoretically work with with DS2072 too. If not - notify the author.The program is able to download* visible part (usually 1000+points) (normal)* all live downloadable data (Maximum)* in STOP mode it can download full memory dump (RAW)and there is automation built into this programm, it can automatically create CSV file upon every waveform fetch and it can automatically copy this file to clipboard or save to disk in different variants.Current limmitation is that this program saves data in 0..255 values as from the scope DAC without converting them to real voltage but this should come added in nearest versions.
help with old vtvm connector and old test equipment connections - Page 1
Forum section: electronics / testgear

author: Napalm2002
author_rank: Regular Contributor
timestamp: May 05, 2015, 01:46:36 am
content: Hello everyoneI have got a few pieces of old eico test equipment and they all have what looks to be some type of antenna connector or coax connector. I need to make some probes and such and I don't know what the designat ion is.

author: Napalm2002
author_rank: Regular Contributor
timestamp: May 05, 2015, 02:50:52 am
content: Yes great thank you

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 05, 2015, 03:06:27 am
content: Wow, those connectors are terrible. I would replace the connector on the meter with a BNC immediately. Don't even bother with those awful things.
HP8922 NOT POWER UP, SMELLS LIKE A BURNED TANTALIUM CAPACITOR :) - Page 1
Forum section: electronics / testgear

author: SeanB
author_rank: Super Contributor
timestamp: April 25, 2015, 11:28:11 am
content: Nice to see them using a DB9 as both a power connector and a board location guide. Only 2 failed capacitors and it works again.

author: cncjerry
author_rank: Unknown
timestamp: May 04, 2015, 09:22:53 pm
content: I see these units often and wonder what people use them for? they have a ton of features though somewhat limited within each module.
Shorting Rigol DP832 outputs - Page 1
Forum section: electronics / testgear

author: danny_isr
author_rank: Regular Contributor
timestamp: May 05, 2015, 08:39:37 pm
content: Yesterday I chained all my outputs, wasn't aware that port 2 and 3 share the same ground.(Was powering one of those cheap DDS Function Generator from Ebay +12 -12 and 5v)Bottom line, I shorted port 2 to ground. it was connected like that for few seconds.I did not have the programmable OC and OV on.Nothing really happen, I saw the display of port 2 all goes to zero.I disconnected that, everything seems to work like before.My question is, is it possible I damaged anything ? or did it go to "protection mode" ? how can you tell ?thanks

author: dadler
author_rank: Unknown
timestamp: May 05, 2015, 09:45:08 pm
content: You are fine.

author: danny_isr
author_rank: Regular Contributor
timestamp: May 05, 2015, 10:08:08 pm
content: that's what I wanted to hearthanks

author: c4757p
author_rank: Super Contributor
timestamp: May 05, 2015, 10:20:49 pm
content: Any lab power supply that isn't shite can be shorted continuously.

author: electr_peter
author_rank: Unknown
timestamp: May 05, 2015, 10:27:47 pm
content: Just shorting outputs is fine. Do not apply reverse voltage or high voltage to inputs though - such experiment can require a significant repair. Seehttps://www.eevblog.com/forum/testgear/rigol-dp832-smoked-channel-1/

author: c4757p
author_rank: Super Contributor
timestamp: May 05, 2015, 10:31:33 pm
content: Yeah, good to keep in mind. I stand by my declaration that it's a faulty, cheapass design though - a fuse and a crowbar cost almost nothing compared to all that metal in there.
Has Rigol came up with updated version of DP832 since I can't find the old one? - Page 1
Forum section: electronics / testgear

author: bubba198
author_rank: Contributor
timestamp: May 02, 2015, 04:54:56 pm
content: Hi everyone,Has Rigol came up with updated version of DP832 since I can't find the old one anymore which was around $400; single color LCD and the channels were lined up in 3 rows rather than the current center star 1/3 of a pie kind of arrangement?Dave had a video about the DP832 discussing the screen channel arrangement so I am sure those exist but even rigol.com no longer sells them at the price point mentioned on the video. The current star arrangement goes for around $450?Thanks

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 02, 2015, 05:10:03 pm
content: http://www.rigol.com/prodserv/DP832/

author: bubba198
author_rank: Contributor
timestamp: May 02, 2015, 10:16:13 pm
content: @PA0PBZhttp://www.rigolna.com/products/dc-power-supplies/dp800/dp832/doesn't explain what happened to the $400 one?

author: dadler
author_rank: Unknown
timestamp: May 02, 2015, 10:53:10 pm
content: I think you are getting the DP832 and DP832A confused.The DP832 has always been ~$450 and is single-color (although you can set the theme to yellow and get a two-tone yellow/orange display).The DP832A is much more expensive and has the "full-color display" with 3-piece "pie" layout. The hardware is essentially identical, both actually have full color displays.

author: bubba198
author_rank: Contributor
timestamp: May 03, 2015, 06:15:52 pm
content: I agree that it is confusing since Dave did say those go for $409 US Dollars on his review:And he specifically said NOT to be confused with 832A which is a higher model. So which is it: $409 as Dave said or $450 as the real world appears to indicate?

author: ThomasDK
author_rank: Regular Contributor
timestamp: May 03, 2015, 06:23:55 pm
content: Quote from: bubba198 on May 03, 2015, 06:15:52 pmThat was almost a year ago, the price must have changed since then

author: dadler
author_rank: Unknown
timestamp: May 03, 2015, 11:33:42 pm
content: I think Dave was converting Australian dollars to USD and vise-versa, the exchange rate fluctuates.Also, with the EEVBlog discount at tequipment, the price is not far from $409.
WaveTek 2002A Parts Needed - Page 1
Forum section: electronics / testgear

author: George_Race
author_rank: Regular Contributor
timestamp: May 02, 2015, 08:50:50 pm
content: Does anyone know of a source for parts for the WaveTek 2002A Sweep Generator.I need replacement Drive Pinion, Idler, and Tape Drive Socket Gears for both the Center Frequency and Sweep Width controls.If anyone has a junk one with good gears that would great to get for repair parts.Picture of broken gear train assembly attached.Thanks,George

author: radhaz
author_rank: Regular Contributor
timestamp: May 02, 2015, 09:07:53 pm
content: You might find suitable gears here:http://www.sdp-si.com/eStore/CoverPg/Gears.htmThe tape drive looks like a candidate for 3D printing.

author: George_Race
author_rank: Regular Contributor
timestamp: May 03, 2015, 12:39:47 am
content: You are right, would be really neat to have a 3D printer and be able to replace the three gears!Tried the web page link, it will not come up, says it cannot be found.Please check and see if there is a mistake in what you sent.Thanks,George
DS1054Z show only difference trace? - Page 1
Forum section: electronics / testgear

author: cjk2
author_rank: Contributor
timestamp: December 30, 2014, 03:08:08 pm
content: I finally got my DS1054Z yesterday and started using it a bit last night.For those that also have one, is it possible to display only the math trace on the screen and remove the two traces that are being subtracted in my case to generate it?In general it seems to me that digital scopes have poor performance when it comes to doing difference measurements. I noticed this on both my old DS1052 and now on the DS1054. These scopes lack an analog adder so they must first digitize the signals then subtract them. My old TAS475 for example can easily do a difference measurement and show only that trace. Perhaps analog adders are just a thing of the past...

author: kwass
author_rank: Frequent Contributor
timestamp: December 30, 2014, 03:25:23 pm
content: Quote from: cjk2 on December 30, 2014, 03:08:08 pmI don't think so, this has been bothering me too. Rigol should add that option as well as an option to not show the underlying signals in X-Y mode.

author: danadak
author_rank: Super Contributor
timestamp: May 02, 2015, 07:41:48 pm
content: I had that problem with FFT, wanted to suppress time domain screen. So Iset it such that ground for TD screen was bottom graticule line, then pushinvert on vertical setup, and TD screen disappears except for the groundline. You could always use offset to remove that line as well.Regards, Dana.

author: kwass
author_rank: Frequent Contributor
timestamp: May 02, 2015, 11:30:11 pm
content: Quote from: cjk2 on December 30, 2014, 03:08:08 pmNo. It's on the wish list in this thread:https://www.eevblog.com/forum/testgear/rigol-ds1000z-series-%28ds1054z-ds1074z-ds1104z-and-s-models%29-bugswish-list/msg584436/#msg584436
how to save Hantek 6022BE scope data to .WAV - Page 1
Forum section: electronics / testgear

author: 6022owner
author_rank: Newbie
timestamp: April 29, 2015, 06:06:19 pm
content: I read most of the:https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/and I downloaded the open6022BE software. But a scope is very much like a microphone and for my purposes a simple recording to a .wav file would be perfect, albeit with a sample frequency of say 10Ms.With a .WAV I can use Audacity as the interface, allowing me slice and dice, and to apply filters and other transforms to get at the data I want. I find it to be a very useful and liberating interface.So maybe someone could give me pointers as to how to do this. It would be great if the open6022BE author would respond

author: rpcope1
author_rank: Contributor
timestamp: May 02, 2015, 09:47:43 pm
content: Open6022BE was done by RichardK, but I've got my own repo to do that, and if you look athttps://github.com/rpcope1/Hantek6022API/blob/master/examples/example_trezor.pyorhttps://github.com/rpcope1/Hantek6022API/blob/master/examples/example_linux_trezor.py(depending on if you're on Windows or Linux), that might help you get where you want to go, if you feel comfortable with Python.Most of my work will be primarily Linux focused for the time being, but if you have the stock drivers, you should be able to utilize the Windows examples from when I first wrote the repo.
Rigol DS1054Z - Page 1
Forum section: electronics / testgear

author: danadak
author_rank: Super Contributor
timestamp: May 01, 2015, 08:53:47 pm
content: Just purchased, upgraded to DS1104.Questions -1) When looking at FFT how do you switch off source channel display ? Just push it off screen with offset ?2) When acquire is set with averaging, does not affect FFT. So noise floor bouncing around on display. Any thougjhts ?3) Cant seem to get Ultrascope running on USB. Saw thread with different drivers, tried them all. RunningLabview Visa runtime 14.0. When I click on run in Ultrascope program just closes.Regards, Dana.

author: dadler
author_rank: Unknown
timestamp: May 01, 2015, 09:14:58 pm
content: You have to start all of the Rigol apps from UltraSigma, after you have found and selected the device via USB/LAN/etc.You cannot start them directly.

author: LaurentR
author_rank: Frequent Contributor
timestamp: May 01, 2015, 09:34:45 pm
content: Quote from: danadak on May 01, 2015, 08:53:47 pmFor 1), there is no known way to remove the signal from the screen and zoom the FFT to full screen.For 3) as mentioned by dadler, you need UltraSigma. The best is to remove anything you have and install:* NI Visa, latest version (14.x). This includes the USB drivers. Do not install the old Rigol drivers, they are deprecated.* UltraSigma* UltraScopeThen:* Open NI MAX and check that you see your scope. If it's on Ethernet, you'll need to add it manually. If it's on USB, it should be all good.* Open UltraSigma and see if your scope is there. If it's in NI MAX, it should be in UltraSigma.* Right click on the scope in UltraSigma and pick UltraScope.

author: danadak
author_rank: Super Contributor
timestamp: May 01, 2015, 10:23:13 pm
content: Thanks all, I had no clue one had to fire up sigma to getto Ultrascope.Regards, Dana.

author: nrxnrx
author_rank: Unknown
timestamp: May 02, 2015, 09:36:33 am
content: Quote from: LaurentR on May 01, 2015, 09:34:45 pmCan't remove the time domain trace, but you can switch "View" from "window" to "full" in the math menu.

author: danadak
author_rank: Super Contributor
timestamp: May 02, 2015, 07:21:38 pm
content: I get rid of time domain waveform by using bottom grid line as ground, and hitting theinvert button, then trace disappears except for its ground line across bottom.Regards, Dana.
Anritsu wiltron  560-7n50 - Page 1
Forum section: electronics / testgear

author: geggi1
author_rank: Frequent Contributor
timestamp: May 03, 2015, 01:37:30 pm
content: I just got my hands on a anritsu S-310A.The Sitemaster have a powerhead input but no powerhead.I was thinking that it might be possible to make a powerdetector with some AD8307 or AD8313
Rigol   MSO1000Z_DS1000Z_UserGuide.pdf        I2C decoder - Page 1
Forum section: electronics / testgear

author: ez24
author_rank: Super Contributor
timestamp: May 04, 2015, 06:54:09 am
content: I was looking at this[url=http://www.tequipment.net/Rigol/DS1054Z/Digital-Oscilloscopes/]http://www.tequipment.net/Rigol/DS1054Z/Digital-Oscilloscopes/and downloaded the manual (or one of them) at:[url=http://www.tequipment.net/assets/1/26/MSO1000Z_DS1000Z_UserGuide.pdf]http://www.tequipment.net/assets/1/26/MSO1000Z_DS1000Z_UserGuide.pdfon page 8-15 I found a screen shot that I am interested in regarding Protocol Decodingthe screen shows an I2C signal with ASCII characters (from the signal) : R I GAlso the manual says "option". Since this manual is for several models my question is:what is the cheapest model (under MSO1000z or DS1000Z series) that I can get with that can use the I2C decoder? And how much does this option cost?thanks

author: JBaughb
author_rank: Regular Contributor
timestamp: May 04, 2015, 07:30:10 am
content: If you browse the manufactures website on any of their scopes there is a section labeled "Accessories" which lists all available options. All their scopes in that series can be upgraded to decide i2c. Its $174 and it includes other serial decodes and triggers. Its all in that section if you want more info.

author: ebastler
author_rank: Super Contributor
timestamp: May 04, 2015, 07:42:21 am
content: Be aware that there are some limitations to the I2C decoding: Contrary to what the early version of the manual says, decoding will only be applied to the segment of your signal trace that is currently visible on the screen. And the sampling on the screen must be dense enough to allow decoding. Hence, only a few bytes of decoded data will be visible at any time.Others have commented that a small USB logic analyzer may be the better choice if you are interested in digital signals only, and need extended recording and decoding of serial buses. Nevertheless, applied together with the dedicated trigger options for the serial protocols, I find the DS1000Z serial decoders quite useful .Since the Z series scopes come with all options activated for a 36h trial period, you can test-drive the serial decoding before deciding whether you want to purchase this option. By the way, people have also used a key generator available on the net to permanently activate the option for free.

author: pickle9000
author_rank: Super Contributor
timestamp: May 04, 2015, 07:48:33 am
content: Funny video on what you will probably end up with.
DDS Noise - Page 1
Forum section: electronics / testgear

author: PsychoMaster
author_rank: Regular Contributor
timestamp: May 02, 2015, 09:46:59 am
content: HII just got my first scope and need a function generator so not having much dough left I'm looking at a Amega DDS kit but as I look into the design it looks awful simple in respect of being noisey as I don't see any filtering.The output comes straight from the chip and into a lm358 op amp.What would filter this without adding distortion?Would using a dedicated chip like a xr2206 or 8038 make a easy build and be a better result.

author: dom0
author_rank: Super Contributor
timestamp: May 02, 2015, 11:20:20 am
content: Please link the schematic, can't say much without it.THD-wise a DDS can and will get quickly (with DAC resolution) better than sine shaper based generators (i.e. XR2206 or equivalent generators based on triangle waves).Noise is almost meaningless without giving a bandwidth. Generally speaking a DDS without a proper reconstruction filter will always have lots of HF content, while this is not an issue with said filter, if dimensioned correctly. At low signal levels digital feed through can become an issue, but I don't think that's important for a basic function generator. It makes more sense to use an analog attenuator anyway to get to low signal levels.A DDS based on a discrete R2R ladder DAC won't be exactly high-fidelity anyways, but should be quite usable for lower frequencies. There are complete integrated DDS ICs available that do much better in many ways.

author: dom0
author_rank: Super Contributor
timestamp: May 02, 2015, 11:24:17 am
content: The hard part of a full-fledged, flexible generator is, at least at low frequencies, not so much the generator part, but rather all the other stuff. You usually want adjustable amplitudes over some large range (say, a few mV to 10s of Volts peak-peak), maybe an additional attenuator, adjustable DC offset and so on. To do that you'll spend some time calculating all the component values and designing it, switches etc. also cost some money. A vintage generator from the 70s or 80s can often be had for less than you'd have to pay for a decent case and some switches alone.
What is this Flukenstein Test Equipment - Page 1
Forum section: electronics / testgear

author: eas
author_rank: Frequent Contributor
timestamp: May 01, 2015, 09:26:27 pm
content: An ebay seller has two of these contraptions for sale, and they keep getting relisted. Each time, they pop up, I wonder, "what is that thing?"It's listed as aFluke 8800A DMM Digital Multimeter Meter w/FTS-2 Field Test Set. There are more photos in the listing.With Google, I've only been able to turn up people scraping the same listing off of ebay. The photos don't show obvious identifying marks, though the markings on some of the controls would probably mean something to people with more than my meager knowledge of electronics and test equipment. I am able to make out a few of the stickers in the photos. One says "Measurement Engineering Section" and gives a phone number that is seems squarely in San Francisco proper. There also appears to be a logo on the sticker, a black circle with a decaying signal trace across it.Whatever it is, I'm guessing it dates from the mid-70s, given their choice of multimeter to incorporate.

author: OV1A
author_rank: Newbie
timestamp: May 01, 2015, 09:57:51 pm
content: A strain gauge calibration bridge.

author: Electro Fan
author_rank: Super Contributor
timestamp: May 01, 2015, 10:31:00 pm
content: Here is a manual that might be from 1974-1975:http://bama.edebris.com/download/fluke/8800a/Fluke8800A%20Instruction%20Manual.pdf

author: dom0
author_rank: Super Contributor
timestamp: May 01, 2015, 10:38:57 pm
content: Well the assembly is obviously not made by Fluke (most obvious: it's an HP System 2 case).I'd concur with OV1A and say it's some sort of calibrator for some sort of resistive four wire sensor application.

author: OV1A
author_rank: Newbie
timestamp: May 01, 2015, 11:21:47 pm
content: At work we use one like this:
Agilent/Keysight scope bandwith specifications - Page 1
Forum section: electronics / testgear

author: Keylectric
author_rank: Contributor
timestamp: April 29, 2015, 09:40:45 pm
content: Hi!If memory serves me, in a PDF article Agisight mentioned this about gaussian vs maximally flat (or something like that) frequency response characteristics for digital scopes. Less than 1GHz bandwith often being gaussian with -3dB at typical specified bandwith. I also think I read about the use of DSP to straighten out the response that is displayed in some products (could have been some other brand though).I have a DSOX3032 wich is supposed to have 350MHz bandwith but when looking in the calibration certificate document from the factory, that spec says -0.27dB and -0.32dB for channel 1 and 2 down at 350MHz (200mV/div). The document mentioned -3dB as lower limit for that particular test.I also looked at Daves video where he plays with the Jim Williams pulse generator, indicating that his 500MHz Agisight scope has a -3dB bandwith of 600-700MHz or so.So, is this the norm or just random "overspecification"?Maybe I actually have a 500MHz scope according to the usual way of specify?Or did they forget to lock my scope to 350MHz.. the scope can be software upgraded to 500MHz (license key).Happy measuring!

author: Keylectric
author_rank: Contributor
timestamp: May 01, 2015, 07:59:28 am
content: Maybe I picked the wrong name for the thread.. feel free to talk about specifications in general and how real spec relates to advertised.

author: nctnico
author_rank: Super Contributor
timestamp: May 01, 2015, 12:36:15 pm
content: The actual bandwidth on an oscilloscope is usually better than specified. On my 200MHz Siglent SDS2000 the actual bandwidth exceeds 300MHz on every channel.

author: Neganur
author_rank: Unknown
timestamp: May 01, 2015, 02:25:31 pm
content: IRRC the 350 MHz and 500 MHz 3000X scope have the same hardware so for me it boils down to that I have no idea how the software/option band limitation works.Also, I don't know how strict you can be about the "3 dB" bandwidth nowadays. I imagine most modern scopes will have a similar response to what you see on your scope. And should you enter the 500 MHz option, the corresponding specs measured at 500 MHz will probably still be below 1 dB. So I would say that the manufacturer just built a good front end for the bandwidth he was targeting at. I wouldn't call it "overspecification" though, just better than spec.

author: MarkL
author_rank: Unknown
timestamp: May 01, 2015, 03:32:28 pm
content: The Agilent/Keysight app note being referenced is probably this one:http://literature.cdn.keysight.com/litweb/pdf/5988-8008EN.pdfAnd from the 3000X user manual (under "Oscilloscope Bandwidth and Sample Rate"):Quote

author: HighVoltage
author_rank: Super Contributor
timestamp: May 01, 2015, 05:09:21 pm
content: All my Agilent / Keysight scopes are exceeding their bandwidth, even the 1 GHz versions.So, I think it is very "normal" that you see this on your scope.
Attention Sencore Lc102 owners..I have a voltage output issue when set above 50v - Page 1
Forum section: electronics / testgear

author: michaelsamra
author_rank: Newbie
timestamp: May 01, 2015, 09:20:53 am
content: I have an Lc102 and every function seems to work on it..It accurately measures capacitance,ESR,Inductance,I can zero it,and when I measure up to 24vdc,I am fine and I can measure 24dc coming out of the leads with my dVM...The light does blink after I put it on 25vdc and above however,I can't get over 50vdc no matter where I set the voltage..What gives?Mike

author: Seekonk
author_rank: Super Contributor
timestamp: May 01, 2015, 11:33:24 am
content: I have a LC101 sitting on top my Keithley 192 and the last voltage it reads correctly is 10V. It does go up to about 300 on the 1KV range. I assume this has to do with extensive current limiting of the boost voltage and it calculates an estimate of the leakage at full voltage. Almost any loading will likely drag this voltage down. I have always considered Sencore hokie stuff but I have come to like this meter for the voltage breakdown test. They have an adaptor that tests SCR etc that connects to this. I don't have this but have used the meter in a similar way to test solid state devices. What troubles me is with the meter reading lower voltage, the leakage remains at zero often when switched to large electrolytics. Thanks for ruining my day. Another test I can't trust.

author: commongrounder
author_rank: Frequent Contributor
timestamp: May 01, 2015, 01:44:41 pm
content: I own an LC102 and it delivers the full voltage entered on the meter for leakage. BUT - You must have a capacitor attached to the leads when you measure the voltage. The current limited voltage source is not very well filtered, and can take a few moments to charge up to the full potential. There may very well be something amiss with your unit, but try putting a cap with a suitable voltage rating on the leads in parallel with your volt meter and see if it measures closer. At least on the LC102, the caps are tested at the real applied voltage, not estimated. I use it for certain kinds of HiPot testing with decent results.

author: Seekonk
author_rank: Super Contributor
timestamp: May 01, 2015, 08:05:42 pm
content: Nice tip, you get a STAR. With a small cap on the 400V range the voltage reading goes from 140V to 321. Close enough with a load. Leakage current went fro 14uA to 32uA. A capacitor will now be used when testing any semiconductor. THANKS!
Rigol 832 - 5 volt regulator options - Page 1
Forum section: electronics / testgear

author: 45Overload
author_rank: Contributor
timestamp: April 30, 2015, 04:47:35 pm
content: What about that LM317 running at 100 degrees C? Is the answer a bigger heatsink? Or, wow, a cool copper heatsink? Or maybe run some wires out the back and move it there? What about this for a solution?power.murata.com/data/power/mpm_78sr-2a_a00.pdfNo board changes necessary.45Overload
Heathkit IG-18 Audio Generator - Page 1
Forum section: electronics / testgear

author: dom0
author_rank: Super Contributor
timestamp: April 30, 2015, 03:02:43 pm
content: Bought this for the approximate price of a decent metal case and some switches. Surprisingly still worked, seems to be mid-late-60s or something like that.It's not exactly a low distortion generator by todays standards (about -65 dB THD), but back in the day it was probably pretty good for a DIY kit. It provides sine and square waves in the range from few Hz (with terrible distortion, since it's lamp-stabilized) up to about 110 kHz.The square wave output performs very well with a rise time of c. 25 ns (~15 MHz), for most things this is already "too well". At this speed an additional switch to limit the rise time to a more sane value like, say, .5 µs would make sense for audio testing.All the square wave measurements were made with a x10 probe directly at the terminals.Bonus image: botched mains input (Heathkit IG-18 0004.jpg)(IG-18 100x100 2Vrms.png: 30 Hz RBW)

author: Vgkid
author_rank: Super Contributor
timestamp: April 30, 2015, 04:01:25 pm
content: If I remember correctly that is a model in which people modify to get really low distortion.yephttp://www.moorepage.net/IG-18-1.html

author: ciccio
author_rank: Frequent Contributor
timestamp: April 30, 2015, 08:01:02 pm
content: I've used one of them, at school.... 1967-1968....The kit was assembled by the students of the previous year.My bench had also an all-tube 5 MHz Tektronix scope, with a spool of silver solder wire inside for repairs, and a soldering iron with home made power control: there were two ac sockets, one at 220V: full power, the other with rectified half-wave mains (about 110V) : low power, to give a longer life to the pure copper bit, with no plating of any kind.
Atten Instruments ATZ3710a  aka Array 3710A   DC Load problems - Page 1
Forum section: electronics / testgear

author: frogblender
author_rank: Regular Contributor
timestamp: April 30, 2015, 08:16:09 pm
content: I have an Atten Instruments ATX3710a DC load. It looks like a rebadged Array 3710a.It has a problem: sometimes the firmware gives itself a giant wedgie, and the load current suddenly increases by 10x, while the screen still displays the 1x current.... and you are left wondering why your UUT has suddenly started drooping/overheating/smoking.The problem seems to occur when the load has to switch measurement ranges... iirc, it has a 3,000 count voltmeter - so when you go from 2.999 to 3.00 volts, a relay inside clicks.... and sometimes the current goes 10x.The fix is randomly either a quick powercycle, or a 1-hour poweroff cycle.This smells of a firmware bug.Does anyone know of a fix?Has anyone flashed the firmware in these?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: April 30, 2015, 08:47:33 pm
content: Try contacting Array. They have been very helpful with me in the past.
Used test equipment sources in UK (surge generator) - Page 1
Forum section: electronics / testgear

author: Mark
author_rank: Frequent Contributor
timestamp: April 30, 2015, 02:48:36 pm
content: Hello all,I am looking to purchase a used surge generator with the following specs. Can anyone suggest a source for this in the UK?1.2/50us open circuit voltage, 8/20us short circuit current.Adjustable from a few hundred volts to 6KV peak.Output Z <= 12 ohm (2 ohm Z would be nice).Output polarity settable to + or -.Manual control is fine. No need for programmability or remote control.Only single output is needed. No need for Mains coupling.No need to be certified for any particular industry or government Standard.Thank you!

author: JackP
author_rank: Regular Contributor
timestamp: April 30, 2015, 03:05:13 pm
content: There are various surplus stores around the UK, where you might find it. Google "surplus electronics test equipment UK" or something to that effect (I found at least five major ones).
A new Antenna VNA from China KC901S - Page 1
Forum section: electronics / testgear

author: dthung
author_rank: Newbie
timestamp: April 30, 2015, 02:17:16 am
content: What is you guys opinion on this product? It looks quite promising and the current price is USD $1299 (including shipping I believe). I have a HP 8753C on my bench but a single port (S11 S21) antenna VNA is very useful for field works.You can check out more info about this product using this link:http://www.deepace.net/kc901s-rf-multimeter/

author: cncjerry
author_rank: Unknown
timestamp: April 30, 2015, 04:01:36 am
content: I took a quick look, there are less expensive alternatives. The question is what does it use for a detector? ADC resolution? How about the master oscillator phase noise? The dynamic range isn't all that great at 100db but would be about 20db over the $350-$600 range which come in at 80db. Depends on your needs I guess. These things are coming down in price but many use AD phase detectors and log amps that have limited dynamic range, cheap oscillators, 16bit ADC, etc. a good, low phase nois, low jitter, master oscillator could cost you $120 by itself, for instance. See if you can find the schematic.

author: KJDS
author_rank: Super Contributor
timestamp: April 30, 2015, 07:01:14 am
content: So much talk about resolution and nothing about accuracy.

author: Bud
author_rank: Super Contributor
timestamp: April 30, 2015, 01:57:43 pm
content: Never seen a analyzer with one vector and the other scalar channelNo Return Loss figures given for the ports, no information on sweep speed and detector bandwidth.
Tektronix 2465 MOD SG - Page 1
Forum section: electronics / testgear

author: mskobier
author_rank: Regular Contributor
timestamp: April 29, 2015, 04:33:11 pm
content: All,One of the parts scopes I will be working on in the near future is a 2465. On the back panel in one of the little oval slots, there is an insert that says MOD SG. From what little I have been able to find on the net, the scope has a factory modification. This mod is identified as MOD SG. What exactly is this mod? I did find a user manual for the 2445/2465 with MOD SG, and I have ordered it. What I do not know is, what exactly does this mod do? I can wait for the manual and that should explain everything, but I am impatient and figured I would ask the group if anyone knew what this mod was. I know the lower left front panel under the screen is different with the Intensity, Beam Find and Focus labels moved from above the control knobs/button to below the control knobs/button, and replaced with the words "Property of IBM". I do think that there is more to this mod than just moving/adding some words around on the panel. If anyone has any information on this mod, it would be greatly appreciated.ThanksMitch

author: mskobier
author_rank: Regular Contributor
timestamp: April 30, 2015, 03:38:21 am
content: I received the answer to my question in regards to what the MOD SG entails. A poster over on the Tek Scope Yahoo forum replied with specific information. Here is what he had to say.In the micro fiche collection used at Tek most instruments had a section called "Custom Mod Prod"where the mods were described. In your case 2465 mod SG says:This manual insert describes MOD SG as it applies to the TEKTRONIX 2445 and 2465 Oscilloscope.Having "property of" and the IBM Logotype added to the front panel marking, and having acustomer-supplied label applied to the rear cover.PARTS LIST ELECTRICAL Change:333-2877-02 1 PANEL, FRONT (CRT)Add:013-0202-00 4 ADAPTER, PROBE TIP195-1870-01 4 LEAD, ELEC. W/6-32 THD, ADAPTER206-0137-01 4 ADAPTER, 6-32 To 0.025 SQ. PIN(Many Thanks Hakan)Mitch
DDS Signal Generator - Page 1
Forum section: electronics / testgear

author: Mad Mart
author_rank: Contributor
timestamp: December 22, 2014, 04:00:27 pm
content: I recently bought one of these from Ebay...DDS Signal GeneratorI haven't tested the outputs on it yet (I won't have a scope for a few days) but, apart from taking 20-30 seconds to boot up, it takes about 7-8 seconds to fully display the next menu item. Is there a way I can speed it up?

author: firepower
author_rank: Regular Contributor
timestamp: April 29, 2015, 01:01:43 pm
content: Seems to be similar to this designhttp://electronics-lab.com/projects/test/013/index.htmlMore newer ones use on boards voltage multiplier circuit.http://www.ebay.com/itm/New-DDS-Signal-Function-Generator-Module-Sine-Square-Sawtooth-Triangle-Wave/221488195152?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D29007%26meid%3D32cb46b3564f4d1dbd1e4a3852fe93a9%26pid%3D100005%26rk%3D4%26rkt%3D6%26mehot%3Dag%26sd%3D251768575779&rt=ncRegarding speed up make sure its using 8Mhz xtal external oscillator, as seen in above pic of PCB, sometime then only use slower internal oscillator.
Datron 1061:What is S77 option? - Page 1
Forum section: electronics / testgear

author: soldersplash
author_rank: Newbie
timestamp: May 04, 2015, 08:39:42 pm
content: Hello all,Does anyone know what the S77 option was on Datron 1061's?I've seen in the manuals I can find options, 10, 12, 20 etc.... basically 2 digit numerical labels for options but nowhere can I find Sxx option information.Kind regards,Daniel.
GE Polyphase wattmeter teardown pictures - Page 1
Forum section: electronics / testgear

author: Nevereven
author_rank: Contributor
timestamp: April 29, 2015, 02:14:07 am
content: I've had this for several decades as a bookend. Thought I'd open it up to see what's inside. No idea about the year of manufacture, but I suspect it been a long time since wood was used in rotary switches. These were made 100 years ago until perhaps the 40's. I don't have the current transformers to go with it.FYI, 1 hectowatt = 100 watts
Micro amp meter - Page 1
Forum section: electronics / testgear

author: j.a.mcguire
author_rank: Contributor
timestamp: April 28, 2015, 07:04:19 am
content: I'm looking for something to measure a gas boiler's flame sense electrode which operates between 2 -> 4 uA @ (i think) 250V Any super cheap recommendations?The voltage surprises me because the electrode has a high-tension lead, so I'm wondering if the voltage could be higher but because we're only dealing with micro-Amps the meters can handle it? Is that possible? I could be wrong and it could actually simply operate on 250V.As a side note, I'm new to the world of scopes and just bought my first, if I want to measure a high voltage signal but don't want to risk blowing the scope by sinking a load of current into it, do I just need to hook up a 250V 1MOhm resistor to the earth lead on the scope for protection? I guess this will only affect signal amplitude? Will Kirchoff's Law allow me to calculate the true amplitude?

author: dadler
author_rank: Unknown
timestamp: April 28, 2015, 07:50:43 am
content: Hmm, I think the Brymen BM27 is intended for measuring flame sensor current:http://www.brymen.com.tw/product-html/cata20/BM20_Catalog.pdfI have one of these meters but I have never used the current function (I don't have any flame sensors).

author: mzzj
author_rank: Super Contributor
timestamp: April 28, 2015, 10:31:46 am
content: Want super cheap?Your cheapest multimeter in a voltage range.Cheapest of cheapos usually have 1Mohm input impedance so it should give you 1 volt per 1 uA.If your meter has 10Mohm input impedance probably you better use 10k to 1.11meg resistor in parallei with your meter input.

author: Fungus
author_rank: Super Contributor
timestamp: April 28, 2015, 11:49:33 am
content: Quote from: j.a.mcguire on April 28, 2015, 07:04:19 amLots of cheap multimeters can measure microamps accurately.Quote from: j.a.mcguire on April 28, 2015, 07:04:19 amNo. Scope probesaren'tdifferential (unless it actually says so on them).The "ground" connector of your probe is usually connected directly to mains ground through the 'scope (measure it with a continuity tester and see!)You can easily destroy stuff by connecting the probe's ground clip to the wrong places (you're shorting the device to mains ground whenever you attach the clip!)You can also blow your scope even if you don't connect the ground clip to anything at all. Whatever you touch with the probe is referenced to mains ground.See video:
Fluke "Best In Test" Free Gift Score(s)/Gift Receipt Status - Page 1
Forum section: electronics / testgear

author: kjdotts
author_rank: Contributor
timestamp: April 28, 2015, 02:31:57 am
content: I scored two free gifts (see below) withFluke's "Best In Test" Promotionwhen I purchased my Fluke 87V and Fluke 117 from TEquipment.NET. The promotion ends in a few days but you have 30-days to register for your free gift(s).Level 2: Spend $450-$1449.99 Get...Fluke 2AC VoltAlertFluke C550 Tool BagI registered for my free gifts and was approved on Thursday, Feb 27, 2015. I have already received two "shipment delayed" emails spaced one month apart.What did you score with this promotion and have you received your free gift(s) yet?-KrisTerms and Conditions: Gift with purchase is available for all purchases of a "Qualifying Fluke Purchase" made from an authorized Fluke distributor in the United States or Canada between January 1, 2015 and April 30, 2015 (complete terms and conditions).
REK RK 8511 and RK 8512 Manual - Page 1
Forum section: electronics / testgear

author: gfiber
author_rank: Contributor
timestamp: March 23, 2015, 03:18:48 pm
content: http://www.rigoloszilloskop.de/info/rk8511-new-53.htmlThe link should allow you to download an English Manual for the REK RK 8511 & 8512 DC loadsThe PDF was apparently to large to attach, 2,271 KB, as it failed when I tried it.Gary K8IZ

author: fremen67
author_rank: Frequent Contributor
timestamp: April 28, 2015, 12:43:26 am
content: Thank you for the link. I received mine last week with a chinese documentationThe software that was on the DVD (v1.14) is in fact the Maynuo one, which is now in v1.20. You can find it on theMaynuo site. It works very well.The RK8511 documentation is almost exactly the one from Maynuo for their m9711,here
Anybody using UT-61E under Linux with USB-serial ?  - Page 1
Forum section: electronics / testgear

author: cdev
author_rank: Super Contributor
timestamp: April 27, 2015, 07:12:13 pm
content: I'm wondering if its possible to use the UT-61E under Linux, ideally using USB, in any way.

author: MatthewEveritt
author_rank: Unknown
timestamp: April 27, 2015, 07:19:28 pm
content: It is possible using sigrok, but I've never found a nice gui for it.

author: cdev
author_rank: Super Contributor
timestamp: April 27, 2015, 09:55:16 pm
content: But you did, using a USB/serial converter?

author: MatthewEveritt
author_rank: Unknown
timestamp: April 27, 2015, 10:24:47 pm
content: I have the non-usb version, but the usb adapter is supposedly supported out the box.http://sigrok.org/wiki/UNI-T_UT61E] http://sigrok.org/wiki/UNI-T_UT61ELooks like there have been a few issues with usb (with fixes)Does it show up under lsusb?
TG6000 Tracking Generator - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: April 27, 2015, 04:39:22 am
content: Anyone ever use one of these or know how it might compare to a HP 85640A Tracking Generator in terms of actual performance?https://www.dsinstruments.com/store/products/tg6000/http://www.dsinstruments.com/wp-content/uploads/2013/10/TG6000_Data_Sht_rev1-02.pdfhttps://www.dsinstruments.com/support/tracking-generator-faq/- last question in FAQ is interesting re: the other thread on clocks (GPSDO vs Rubidium reference)http://www.ebay.com/itm/Tracking-Generator-with-Internal-Signal-Generator-Replace-HP-85640A-/281603788756?pt=LH_DefaultDomain_0&hash=item4190e4cfd4&nma=true&si=lnZcAxuqrHrSW1C%252F5viCKobYT84%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

author: Hugoneus
author_rank: Frequent Contributor
timestamp: April 27, 2015, 04:56:06 am
content: Interesting. I would like to see phase noise plots.Although the answers to the last FAQ is correct, the language is sometimes a little unprofessional.The output power is 0dBm, which is not a lot.

author: cyr
author_rank: Frequent Contributor
timestamp: April 27, 2015, 06:20:30 am
content: This device seems quite similar to what I made, a 10MHz reference feeds a PLL synthesizer chip to generate the signal at IF of the analyzer, which is then mixed up or down with the LO signal from the SA to produce the output. To switch bands you have to switch the RF and IF ports on the mixer, which is why they have an external jumper connection on the front panel.It will probably have a lot of spurious outputs, not very flat, and not very good SWR. I'm sure it works, not sure it's worth 700$