hybridfree/eevblog-posts huggingface dataset:
Fluke 189 frequency off? - Page 1
Forum section: electronics / testgear

author: int2str
author_rank: Regular Contributor
timestamp: February 23, 2015, 12:10:42 am
content: I'm generating a simple 1KHz square wave with an Atmega328p (16Mhz crystal).I've measured the output with the following equipment at my disposal:- Saleae Logic digital- Frequency 1kHz- Duty cycle 50%- Pulse duration 0.499958ms- Extech EX330- Frequency 999.7Hz- Duty cycle 50%- Fluke 189- Frequency 1.0000 kHz- Duty cycle51.14%- Pulse duration 0.51msThe Fluke is probably at least 10 years old, but I did not expect it to be that far off.Would this be expected? Can't interpret the datasheet well enough to see if it is within spec.If it's not within spec, do Fluke calibrate old meters?Thanks!

author: Wytnucls
author_rank: Super Contributor
timestamp: February 23, 2015, 12:44:19 am
content: Try DC mode for square waves with manual voltage range selection. Also try triggering on downslope. Use Min Max average for duty cycle.Accuracy may depend on signal peak voltage.

author: int2str
author_rank: Regular Contributor
timestamp: February 23, 2015, 12:56:07 am
content: Yes, DC mode with manual voltage is selected.I'll try the min/max/avg.Peak voltage is 4.7V

author: int2str
author_rank: Regular Contributor
timestamp: March 02, 2015, 05:54:33 am
content: Ok, I think I've found a "Trap for young players" as Dave would likely say...Received a DS3231 RTC today and hooked up the Fluke 189 to the square wave and 32.769kHz outputs of the module.As it seems,to read a frequency correctly, the multimeter must be set to AC V/mV.When set to AC mV and switching to Hz, the meter reads exactly 32.769 kHz on the 32kHz pin of the chip and exactly 8.192kHz on the square wave pin.When the meter is set to DC V/mV, the Hz reading is all over the place (around 8.22x kHz for the square wave).Now having a total of 3 multimeters in the house + 1 logic analyzer, I can say that the Fluke 189 seems to read the frequency with the most accuracy and it looks like nothing is wrong with it!Hope my mistake will help someone else...
Configuring/Reading Siglent SDG10xx Signal Generator via PC - Page 1
Forum section: electronics / testgear

author: asilva10
author_rank: Contributor
timestamp: February 28, 2015, 07:57:23 pm
content: I would like to get any simple example of configuring SDG1010 (or similar) model via PC.I do not want to use LabView. Ideally, I would like to use Visual Basic for simplicity, but any language is fine, once it becomes clear how the communication with the device occurs.Usually, I have all my instruments with a serial interface and I do not have to care about software details, just read the syntax at the manual and it is done after a couple of hours. Unfortunately, this is the only equipment with non-serial (NI-VISA compatible?) interface.My goal is to programmatically setup the frequency/amplitude of a sinusoidal wave at CH1 and CH2 and read what I configured to make sure that the device was properly configured (imho, this is a good practice regarding remote controlling instruments).Accepting suggestions!! Thank you!!
Philips PM3295, broken driver for Y-deflection of CRT - Page 1
Forum section: electronics / testgear

author: Staffan321
author_rank: Regular Contributor
timestamp: February 27, 2015, 04:01:15 pm
content: Hello,I have a broken Philips PM3320 oscilloscope where the fault is a module (N4004) for driving the Y deflection of the CRT. Anyone having experience with repairing Philips scopes or can suggest where I should look? I have gone through regular trouble shooting and I'm certain it is this mini-module (thick film board?) that indeed is broken. Is it possible to get replacement hardware anywhere?Any suggestions would be very valuable!Many thanks in advance!Regards,Staffan

author: Fungus
author_rank: Super Contributor
timestamp: February 27, 2015, 04:47:09 pm
content: http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Philips/pm3320.pdf

author: Staffan321
author_rank: Regular Contributor
timestamp: February 27, 2015, 07:53:02 pm
content: Hello,Sorry for the typo, I have the 3295, not the 3320. It is the N4004 that is broken though...Regards,Staffan
OWON SDS7102 calibration problem - Page 1
Forum section: electronics / testgear

author: losmichal
author_rank: Newbie
timestamp: March 01, 2015, 05:39:38 pm
content: hii have problem with OWON SDS7102 it's show 50v when i connect 5vi have try self calibration but it's not change anythingi was going to make manual calibration but when connecting to PC i get message USB device not recognized i got win7 64bit

author: radhaz
author_rank: Regular Contributor
timestamp: March 01, 2015, 07:30:22 pm
content: Did you install the Owon drivers?

author: losmichal
author_rank: Newbie
timestamp: March 01, 2015, 07:50:30 pm
content: i have try on older PC with win XP and it's work but i still dont know have to do manual calibrationcan you help me with downloading tx.txt file ??

author: Mark
author_rank: Frequent Contributor
timestamp: March 01, 2015, 08:23:18 pm
content: It sounds like you are using a 1x probe with a a 10x setting...

author: losmichal
author_rank: Newbie
timestamp: March 03, 2015, 08:44:59 am
content: thank you it's was probe problem, i get new on and it's OK
Ebay 34401A  - Page 1
Forum section: electronics / testgear

author: Bryan
author_rank: Frequent Contributor
timestamp: February 27, 2015, 06:38:38 am
content: Wow a very rare 34401a, disguised as a 3478a. And at a fantastic pricehttp://www.ebay.com/itm/HP-Agilent-Keysight-34401A-Digital-Multimeter-NICE-6-1-2-Digit-/191522006537?pt=LH_DefaultDomain_0&hash=item2c9799e609

author: babysitter
author_rank: Frequent Contributor
timestamp: February 27, 2015, 07:08:29 am
content: Just use SYST:LANG SCPI to turn it back, its on compatibility mode! I did that several times last month!

author: Paul Moir
author_rank: Frequent Contributor
timestamp: February 27, 2015, 07:11:23 am
content: I wonder where the other digit went?

author: JohnnyBerg
author_rank: Frequent Contributor
timestamp: February 27, 2015, 10:15:17 am
content: And only $120 shipping! A real bargain for over $1000
Oldie HP 3325A or Hantek HDG2002B function generator? - Page 1
Forum section: electronics / testgear

author: slow_rider
author_rank: Regular Contributor
timestamp: February 26, 2015, 11:45:10 am
content: I need a new function generator... I am looking at an HP 3325A for a while now, it fits by budget and it is sold with guarantee that everything is working. I assume it is not calibrated per spec. but most changes I can live with that. On the other hand there is the Hantek HDG2002B which costs a bit more and is brand new and although it only reaches 5MHz I think I can live with that.I mostly do stuff in the audio range but good sweeping functions are important for me as well as an instrument I can count upon. I do want some over 1MHz capabilities so that I can trust what happens to circuits when clock signal is applied.Your thoughts on this?

author: wn1fju
author_rank: Frequent Contributor
timestamp: February 26, 2015, 01:21:59 pm
content: I have an HP 3325A and it is very nice. Built with usual 1980's HP quality, it should last forever. The only potential "faults" are the attenuator relays which can easily be cleaned. However, look at the specs carefully. Although sine waves go to 21 MHz, square waves only go to 11 MHz and triangle and ramps only go to 11 kHz!!!
:: finally ... BM857S on TME - Page 1
Forum section: electronics / testgear

author: 3roomlab
author_rank: Frequent Contributor
timestamp: February 19, 2015, 07:07:19 am
content: as aboveBM857S is now listedhttp://www.tme.eu/en/details/bm857s/portable-digital-multimeters/brymen/#yay ! the poor mans "high" resolution DMM (other than UNI-T61E)(the 869 are also now listed as 869S, not A)

author: JohnnyBerg
author_rank: Frequent Contributor
timestamp: February 19, 2015, 09:08:37 am
content: Quote from: 3roomlab on February 19, 2015, 07:07:19 amLooks like a very nice multimeter, high count and accurate,QuoteComparison with the UT61E is not realy fair, as the Brymen is 4 times the price of a 61E.And there are poor and very poor man ..

author: Yago
author_rank: Frequent Contributor
timestamp: February 19, 2015, 12:02:25 pm
content: Did you get one 3Room?Don't forget a pair of the Brymen crock clips, they are great quality.

author: necessaryevil
author_rank: Regular Contributor
timestamp: February 26, 2015, 11:24:47 am
content: Little bit offtopic since it does not apply to VFD's: most true rms multimeters seem not to be able to measure AC signals with DC offset. If you want to have a Fluke which can do this you have to go for the 287/289.
Rigol DP832 Voltage and Current Accuracy Question. - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: February 25, 2015, 03:18:50 am
content: Hello,I am looking at the Rigol DP832 specifications to try to figure out what the voltage and current accuracy of the unit are and it seems pretty straight forward, but just to verify, could anyone tell me if my calculations below are correct or not? I have attached the DP832 specification manual in case it helps.Basically, according to me:1) If the output voltagespecifiedby me is 0 volts, then the unit could potentiallyoutputany voltage value between -0.020V and +0.020V (can the min value actually be negative?).2) If the output voltagespecifiedby me is 1 volt, then the unit could potentiallyoutputany voltage value between 0.9795V and 1.0205V.3) If the output voltagecoming outof the unit is exactly 0 volts, then the unitreadbackcould potentially be any voltage value between -0.010V and +0.010V (can the min value actually be negative?).4) If the output voltagecoming outof the unit is exactly 1 volt, then the unitreadbackcould potentially be any voltage value between 0.9895V and 1.0105V.I feel I am doing something wrong because with the high-resolution option installed (to go down to milli-volts / milli-amps) it seems to me like the +/- actual vs display is huge.Thanks.

author: LaurentR
author_rank: Frequent Contributor
timestamp: February 25, 2015, 05:34:34 am
content: That's pretty much correct. There is also the other stuff (regulation rate and noise), but it's small. If you want to see in practice what the accuracy looks like, seethis thead.The 1mV option gives you greater resolution but definitely not better accuracy. Even in practice, this accuracy is quite a bit worse than 1mV. I found (see the thread above) that a freshly-calibrated DP832 gets you about +/-10mV across the range with peaks and valleys along the way. There is a significant temperature drift in the multiple mV across the specced range (25 +/- 5C).The ADC is pretty good though, within a couple of mV across the range.Note that it is not uncommon at all for the discrepancy between resolution and accuracy to be large. For instance, the highly regarded 6 1/2-digit 34401A DMM gives you a best-case 1yr reading accuracy of 40ppm, which is 40 counts on its display.So the DP832 spec is not bad. Just be aware that the high-resolution option gives you resolution that is substantially smaller than the accuracy.
Weird resistance readings - Page 1
Forum section: electronics / testgear

author: netdudeuk
author_rank: Frequent Contributor
timestamp: February 22, 2015, 11:16:33 pm
content: Anyone know why I can apparently measure low resistances ok but when I try to measure those at several hundred K and above, the reading continuously fluctuates ? I've changed the battery and that made no difference.Thanks

author: Andy Watson
author_rank: Super Contributor
timestamp: February 22, 2015, 11:25:18 pm
content: Details ?What meter, what resistances?Have you got your fingers on the probes?

author: macboy
author_rank: Super Contributor
timestamp: February 23, 2015, 02:18:31 pm
content: Quote from: Andy Watson on February 22, 2015, 11:25:18 pm+1It happens to everyone.

author: netdudeuk
author_rank: Frequent Contributor
timestamp: February 23, 2015, 05:04:26 pm
content: It didThanks for the advice.

author: theatrus
author_rank: Frequent Contributor
timestamp: February 23, 2015, 05:49:39 pm
content: Meddling fingers!Also useful to "temporarily tune" circuits by just touching everything

author: netdudeuk
author_rank: Frequent Contributor
timestamp: February 23, 2015, 09:12:33 pm
content: Yeah, but at least I fell on my sword for the good of the next people to do it

author: electr_peter
author_rank: Unknown
timestamp: February 23, 2015, 09:36:24 pm
content: Recently I measured big alligator clip leads for resistance (should be infinite or very high). I got close to zero Ohms because metal clip surfaces were shorting (I was holding both clips in my palm)Who knew that metal is a conductor?

author: atferrari
author_rank: Frequent Contributor
timestamp: February 23, 2015, 10:50:59 pm
content: Quote from: electr_peter on February 23, 2015, 09:36:24 pmOh no!! Is it, really?

author: cncjerry
author_rank: Unknown
timestamp: February 24, 2015, 03:50:39 pm
content: I recently did the finger thing with one of my HP 3457s. I swear I can feel the juice. It has sort of that RF feeling you get when touching a transmitter.
Rigol MSO2202A Possible Bug - Page 1
Forum section: electronics / testgear

author: PeterHouse
author_rank: Contributor
timestamp: February 25, 2015, 03:52:43 am
content: Enclosed are a few screenshots showing timing alignment issues between the LA and Analog Channels after an initial capture.The trigger is set to LA Channel D3 set to a user level of 2.5vdc. The D3 and CH 1 are probing the same signal on the system under test.Screen shots showing Error:DS2_Quickprint2.pngshows the capture of a microcontroller startup sequence captured at 1s per division.DS2_Quickprint3.pngshows the same captured waveform zoomed in to 2.000ms per division. The D3 – CS signal and the OUT0 or Ch 1 signal are the same signal but the CH 1 is shown delayed by 10 divisions or 20ms.Screen Shots Showing Correct Signal Alignment:DS2_Quickprint4.pngshows the capture of a microcontroller startup sequence captured at 100.0ms per division.DS2_QuickPrint5.pngshows the same captured waveforms zoomed in to 500.0us per division with correct time alignment.Capturing this waveform at any time base over 100.0ms per division causes the Analog channel to have a delay and NOT be in alignment with the Digital channel when zoomed in. For instance, at 200ms per division initial capture the CH 1 signal shows as 4ms delayed, and at 500.0ms per division initial capture the CH 1 signal shows as 10ms delayed when zoomed in to 500.0us per division. The problem gets worse as the captured time per division gets longer. Any capture time base 100.0ms or less shows correctly when zoomed in.These continued issues are making it very difficult for me to trust in any critical measures made with this equipment.Please let me know if you can duplicate this issue.PS: Software Version 00.03.03.SP1 dated December 15, 2014.
OLd Style Surplus Dealers in Miami/Fort Lauderdale area? - Page 1
Forum section: electronics / testgear

author: JoeD
author_rank: Contributor
timestamp: February 23, 2015, 12:16:44 pm
content: Are there any old style surplus equipment dealers in the Miami/Fort Lauderdale area? I've tried Google and come up with various IT recyclers but nothing that said electronic test gear? Any local recommendations?

author: GreyWoolfe
author_rank: Unknown
timestamp: February 23, 2015, 01:37:17 pm
content: I don't know of any down there. If you ever get froggy and decide to take a road trip, come to Orlando and visit Skycraft. They do have a small selection of old test gear and lots of other neat goodies to look at. Check them out online. It's basically a surplus store so you can see something different every time you go.

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 23, 2015, 02:00:28 pm
content: It's not Miami, but Skycraft has been in Orlando for an eternity. I remember buying surplus NASA junk from them back in the 70s. Might be worth a call to see if they have anything interesting.

author: rdl
author_rank: Super Contributor
timestamp: February 23, 2015, 03:03:35 pm
content: I don't know if they'd be considered "old style surplus", but Marlin P. Jones & Associates has a store in West Palm Beach. I've never been there, but I've ordered stuff from them online several times.www.mpja.com

author: nanofrog
author_rank: Super Contributor
timestamp: February 23, 2015, 10:46:59 pm
content: Quote from: GreyWoolfe on February 23, 2015, 01:37:17 pmAnother vote for this place if you're willing to make the trip.If not, you can at least get an idea of the place via the link above (and order some stuff if you wish).Quote from: rdl on February 23, 2015, 03:03:35 pmI'd forgotten about this place.Thanks for the reminder (& link).

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: February 24, 2015, 12:17:56 am
content: Me too on Skycraft. I like to pick up wire from them. You can buy teflon insulated wire by the foot. I haven't found anyone else out there with the selection size and you don't have to buy it by the spool.

author: JoeD
author_rank: Contributor
timestamp: February 24, 2015, 02:01:55 pm
content: Unfortunately this trip is Miami and surrounding area but I will take note of the Orlando location for my next trip there. Shame about Miami....

author: nanofrog
author_rank: Super Contributor
timestamp: February 24, 2015, 02:13:01 pm
content: Quote from: JoeD on February 24, 2015, 02:01:55 pmFWIW, West Palm Beach is ~70mi/1 hr. north of Miami on highway I-95. Depending on the particulars of your trip, that might be doable (MPJA store mentioned byrdl).
RF Explorer Signal Generator Firmware v1.12 Beta 13 - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: February 25, 2015, 07:20:31 pm
content: Just an FYI. The latest firmware upgrade just posted yesterday finally adds support for frequency sweep!A few other enhancements, battery level and bug fixes.http://micro.arocholl.com/index.php?option=com_content&view=article&id=52&Itemid=70
Fluke 185/183 - Page 1
Forum section: electronics / testgear

author: Wytnucls
author_rank: Super Contributor
timestamp: September 03, 2014, 07:29:16 am
content: I've just discovered the discontinued Fluke 185/183. There seem to be very few around these days. When they do come up on eBay, they sell for a pittance. If anybody has one of them, some comments from an owner's perspective would be interesting. On paper at least, it has some decent features and should command a higher price on the second-hand market.

author: retiredcaps
author_rank: Super Contributor
timestamp: September 03, 2014, 07:41:04 am
content: Quote from: Wytnucls on September 03, 2014, 07:29:16 amShhhhhh. Readers pay no attention to the above!QuoteMark Z, a member here, did a video review.

author: Wytnucls
author_rank: Super Contributor
timestamp: September 03, 2014, 08:34:25 am
content: Thanks, good review.Here is the thread about the TX3:https://www.eevblog.com/forum/reviews/tektronix-tx3-multimeter-review/

author: Wytnucls
author_rank: Super Contributor
timestamp: September 03, 2014, 01:28:33 pm
content: Well, what do you know? I bought one!

author: retiredcaps
author_rank: Super Contributor
timestamp: September 03, 2014, 04:31:20 pm
content: Quote from: Wytnucls on September 03, 2014, 01:28:33 pmI'm jealous!

author: Wytnucls
author_rank: Super Contributor
timestamp: February 23, 2015, 11:35:58 pm
content: Here is a TX3 for sale. I think the price is a bit steep, but they are as rare as hen's teeth:http://www.ebay.com/itm/Tektronix-TX3-DMM-True-RMS-Multimeter/191513544267?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D28797%26meid%3D924ae8773f6d4daca5be5de1ad96a5c0%26pid%3D100033%26rk%3D4%26rkt%3D4%26sd%3D181674269674
Philips/Fluke color scheme timeline - Page 1
Forum section: electronics / testgear

author: dom0
author_rank: Super Contributor
timestamp: February 23, 2015, 08:14:54 pm
content: I've seen so far at least three "color schemes" on Philips/Fluke stuff:1. Brownish base color, type label on the front panel white text on black background with a red line on top. Knobs brownish. All LEDs red.2. Brown-greyish base color, type label with white text on blue background, no line. Knobs dark. All LEDs red.3. Grey with a blue square near PHILIPS. Knobs grey or white. LED displays green, LED indicators yellowI know that 3) is the latest one before everything was rebranded with Fluke (color scheme stayed the same, I assume it was introduced after Fluke bought Philips T&M but before laying down the brand name). Does someone know which one of 1) and 2) is newer?I'dguess1) is the older one, but that's really just a guess with nothing to back it up.
HP 16702A software - Page 1
Forum section: electronics / testgear

author: MarkoAnte
author_rank: Regular Contributor
timestamp: February 16, 2015, 09:44:46 am
content: Hi,I bought an old HP 16702A some time ago and its served me great with my parallel buses and debugging. (I work with FPGA chips). But now I have to trouble shoot a UART bus between 2 uP. I would like to see my UART bus in a humane format and I need the HP B4601B Serial Analysis Tool Set upgrade but it is no longer available at H?p? amm A?g?i?l?e?n?t? emm Keysight.Does anybody have any idea how to get it? Can somebody send me the licence key?

author: fmav
author_rank: Newbie
timestamp: February 18, 2015, 05:44:45 pm
content: You can use the password "demo" to enable the toolset for two weeks. There is a way to trick the system: you turn the system clock many years forward (lets say to 2030) and then use the password "demo". After that you can return to 2015 and you will have many days left for using the toolset. Caution: If you have already used the password, you have to reignite the instrument software.

author: MarkoAnte
author_rank: Regular Contributor
timestamp: February 23, 2015, 12:04:49 pm
content: @ fmavIt worked !! Ty very much. Now I have 5k days to finish my debugging, hope I will get it done till then
HP E3634A power supply with dim display - Page 1
Forum section: electronics / testgear

author: drakke
author_rank: Regular Contributor
timestamp: February 23, 2015, 01:31:04 am
content: Is it possible to locate a replacement VFD (vacuum fluorescent display) for the HP E3634A power supply?Where would one look for it?Thanks.

author: MarkL
author_rank: Unknown
timestamp: February 23, 2015, 01:50:58 am
content: Here's a success story on VFD rejuvenation:https://www.eevblog.com/forum/chat/vacuum-fluorescent-display-rejuvenation/
HP 34970A, errors 740, 741, 747, 748 - Page 1
Forum section: electronics / testgear

author: Honza
author_rank: Newbie
timestamp: February 19, 2015, 07:55:15 pm
content: Could someone help me identify faults at HP 34970A unit which I bought via online auction.First I thought that all errors are caused by leaking battery but the new battery didn’t help.The unit shows errors 740, 741, 747, 748 after a self-test run.Another detected faults:- after switching on (push the on/off button only, the unit is plugged all the time)the unit can‘t remember a communication HPIB or RS232 setting, it’s back in default/factory setting; once I set up again communication RS232 is working (tested), I’m not able to checkHPIB status.- UTILITY setup:- the unit remembers the time and date settings- CAL SECURED changes to UNSECURED after switching off- PWR ON RESET changes to LAST after a few time switching off- I get error 741 by change DMM ENABLED – DISABLEIt looks like when I adjust the equipment it’s working fine until the switching off. As per my understanding (and tips on web) the 740 serie errors are mostly caused by a defective FRAM (U450, U201). Or might be there an another problem? Many thanks !

author: free_electron
author_rank: Super Contributor
timestamp: February 19, 2015, 08:05:27 pm
content: jep. your FRAM is corrupted.open the machine, unplug the connector going from the DVM module to the mainboard and power up.if all goes well you have no errors.if you have errors most likely one or more traces underneath the leaky battery have been eaten away. and or the fram that sits right next to the battery has its pins eaten ... i've seen that at least twice .if you have no errors then the fram on the dvm module is hosed. you need a new fram with data in it. that will power up the machine and then you can calibrate it.

author: Honza
author_rank: Newbie
timestamp: February 20, 2015, 07:26:00 pm
content: Thanks for your answer. I checked it, there are still errors but it doesn't look lik the battery has eaten pins or traces, see the picture.Do you have any other idea? Thank you.

author: free_electron
author_rank: Super Contributor
timestamp: February 20, 2015, 08:04:54 pm
content: see that little 8 pin devices labeled 24c02 ? that is your problem.it has losts its data and is wonky.that chip needs replacing and programming with the config.

author: Honza
author_rank: Newbie
timestamp: February 22, 2015, 10:56:44 pm
content: Quote from: free_electron on February 20, 2015, 08:04:54 pmI saw in discussion that some time ago you offered this device, is it still available? Or the image file at least? Thanks.
Hacking DS2000A series scope with firmware 00.03 - Page 1
Forum section: electronics / testgear

author: bigone5500
author_rank: Contributor
timestamp: February 13, 2015, 06:44:19 pm
content: Can someone please help me with this? I have done all I can that I can comprehend and have had no luck. I have all the programs that are mentioned in most of the posts. I can connect to my scope through the LAN and also find it through USB. However, I can not get the modified firmware to load due to the newer one on my scope. I have firmware 00.03.00 SP1 and Hardware version 2.0Is there anyone who knows how this can be accomplished?Thank you in advance!!!

author: bigone5500
author_rank: Contributor
timestamp: February 13, 2015, 11:07:27 pm
content: I have been trying to figure out this scpi thing and have successfully sent and read the data through the interface. I cannot for the life of me figure out how to get this data to a .bin file. I have tried to export history data to a csv file and that is a failure as no keys exist in the file.I am biting at the bit to get this to work.

author: chrismarworth
author_rank: Newbie
timestamp: February 22, 2015, 07:32:34 pm
content: I have updated my DS2072A and the only output file I could obtain had a .scpi attribute. However rigup obtained keys from this and I updated my scope and had all the installed updates.
Picoscope on Linux - a note F.Y.I. - Page 1
Forum section: electronics / testgear

author: StarFishPrime
author_rank: Contributor
timestamp: February 21, 2015, 11:12:36 am
content: HiJust if anyone is interested. I have a Picoscope USB (mdl 2003) running happliy on Linux, specifically Ubuntu 14.10. Picoscope provide a Linux version of their Picoscope software which runs natively on Linux and seems fine to me.However their logging software - PicoLog is Windows only. I have it running successfully before me on an Ubuntu system within an XP virtual machine using VirtualBox under Ubuntu. The only problem was that, under Linux I had to make sure that I added the current user to the vboxusers group.Ian

author: dadler
author_rank: Unknown
timestamp: February 21, 2015, 09:01:29 pm
content: Do you find the Linux software fully featured?Their primary windows PicoScope software (at least for the lower models) is C# based, so their recent Mac port is based on C#/Mono. I was saddened to see that the Mac version is missing tons of functionality. Many of the menus and functions are simply not there. The software is also choppy under Mono.I have a PicoScope 2204A (lowest possible model) as a portable scope for automotive use--and was hoping to use it on my MacBook Air under OSX when I heard of the Mac port. I guess I will continue using the windows version.

author: dom0
author_rank: Super Contributor
timestamp: February 21, 2015, 09:40:27 pm
content: Mono is primarily developed for Linux as far as I know.

author: dadler
author_rank: Unknown
timestamp: February 22, 2015, 07:32:19 pm
content: Mono works great under Darwin/OSX. I develop against it at work daily (we also run Mono on Android and iOS). It's 'intended' to be cross-platform in the same way Java intends to be and I've encountered no performance problems with it on any of the UNIX platforms.That said, PicoScope on Windows was certainly developed as a C#/.NET app using the MS Libraries. Mono is not at parity, library-wise, with .NET. I suspect that this precluded easy porting to UNIX and they had to do a hack job and ifdef out some of the features. Hence my ask If the Linux version is stripped down.
Xtralien SMU - Page 1
Forum section: electronics / testgear

author: rf-design
author_rank: Regular Contributor
timestamp: February 25, 2015, 10:53:24 am
content: I did request more info about the analog but get no answer. The blog entry is little old.http://www.xtralien.com/blogIs the project still alive? Anybody got more info about the analog? Vaporware?
DS1054z flash drive size/file system type  - Page 1
Forum section: electronics / testgear

author: targit
author_rank: Regular Contributor
timestamp: February 22, 2015, 03:11:15 am
content: Hi, I just got myself a nice new 1054z and want to use a USB flash drive with it , but none of the ones I have are recognised by the scope. I cant find a specification for the type of drive I should be using in the documentation. Could someone please recommend a drive they have that is recognised, and what size and file system they are using.Thanks.

author: LightlyDoped
author_rank: Contributor
timestamp: February 22, 2015, 04:11:04 am
content: I think it shouldn't be larger than 8 GB and should be formatted FAT 32 or FAT 16.

author: targit
author_rank: Regular Contributor
timestamp: February 22, 2015, 04:34:48 am
content: Hi, thanks for that, I just found another old Toshiba drive which is now working after a reformat. -FAT32 8GB.Cheers.

author: robrenz
author_rank: Super Contributor
timestamp: February 22, 2015, 04:53:20 am
content: I have found that quick format does not work and also after a full format it took several tries before the scope recognized the stick. It was definitely squirrely at first, but once it finally recognized the stick it was consistently recognized from then on.

author: dadler
author_rank: Unknown
timestamp: February 22, 2015, 07:22:53 pm
content: I was able to use a brand new 64GB PNY USB 3.0 flash drive, preformatted FAT32, without issue. Upgraded the firmware on my DS1054Z, DG1032Z, and DP832.http://www.amazon.com/gp/product/B00FDUHDAC/ref=od_aui_detailpages00?ie=UTF8&psc=1
What is a Magnetic Flow Calibrator? - Page 1
Forum section: electronics / testgear

author: Cigarsnob
author_rank: Regular Contributor
timestamp: February 19, 2015, 09:46:23 pm
content: Hi Everyone,I just acquired an old piece of equipment from a co-worker as we are packing up to move to another facility. I have no idea what it is, but the label says: Magnetic Flow Calibrator. Model: 896CAL. Manufacturer: FoxboroA quick google search didn't show much except for one ebay listing over in Europe and some other links that didn't seem all that helpful. I did find the link below though and from there it states that magnetic flowmeters can be used for slurries among other purposes. Okay.http://iom.invensys.com/EN/pdfLibrary/Brochure_Foxboro_Municipal%20MagMeter_05-06.pdfAny info on this would be great. Thanks for the help.

author: radhaz
author_rank: Regular Contributor
timestamp: February 20, 2015, 12:36:10 am
content: It's for calibrating magmeters.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 20, 2015, 12:56:23 am
content: Looks like it measures flow rate of a conductive liquid by passing through a magnetic field, presumably measuring the electromagnetically generated voltage

author: Cigarsnob
author_rank: Regular Contributor
timestamp: February 20, 2015, 06:38:15 pm
content: Interesting! Thank you both for your guys' feedback.

author: SeanB
author_rank: Super Contributor
timestamp: February 20, 2015, 07:00:57 pm
content: Basically it is a generator, the exact opposite of a MHD pump. A flow of conductive liquid through a magnetic field generates a voltage detected by 2 electrodes inserted into the insulated pipe walls. Probably the only flow measuring system that can deal with pebbles in the flow without having a too large error or breaking. Do not use with ferrous slurries unless it has an AC excitation coil that is periodically switched off so it self cleans. If it uses a permanent magnet you will have to clean tramp iron from it at intervals or live with slightly reduced accuracy as the level builds up and clears with flow.
Help with custom probes and impedance stuff? - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 24, 2015, 07:42:33 pm
content: OK so ive seen some videos from dave and mikes electric channels about probing hi speed signals. Im a little confused about something, Are scopes like Rigol, Atten, Hantek, 50 ohm impedance? If so can you just use a piece of RG58 with a bnc connector to probe? Do you still need a 50 ohm terminator or resistor? I also have a PC baased function gen with BNC out on it would RG58 be the best thing to use as a cable for it? It did not come with one.Lastly if I have RG59 bnc connectors and compress them to rg58 will that work or are rg59 connectors set up to be 75ohm?

author: SArepairman
author_rank: Frequent Contributor
timestamp: February 24, 2015, 08:51:27 pm
content: An ohm mis match on low power levels will often not yield significant error.Familiarize yourself with this training film to understand oscilloscope probes better:As for your question, I get a perfect square wave out of my function generator at higher frequencies only when I connect the scope with internal 50 ohm termination to the function generator which has 50 ohm internal termination using a BNC to BNC cable.However, 50 ohm termination is usually just an optional mode on some scopes, they are mostly 1MOhm input resistance, and you will require special probes that have distributed resistance etc. Using a regular BNC cable is not acceptable in this situation in most cases.

author: N8AUM
author_rank: Regular Contributor
timestamp: February 24, 2015, 08:53:58 pm
content: Quote from: rwgast_lowlevellogicdesin on February 24, 2015, 07:42:33 pmMost probes, at least the good ones are "X10" and have an impedance of 10 Megs. Reason for that is that you DO NOT want the probe to have any effect on the circuit that your measuring, not to load it down. Lots of things go into play with probes one of which is its capacitance which can can give you incorrect measurements on high speed signals.Basically, you get what you pay for !As far as using using a 75 ohm BNC with 50 ohm coax, it will work ok at low frequencies.Good luck !

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 24, 2015, 09:08:10 pm
content: Well really I just want low impeadence to measure fast square waves, and to build the same kind of differential probe dave did in his power supply noise video, where he used both scope channels and then used the subtract function to figure out the ripple and noise. I also have a maxim chip that can generate 100mhz plus square waves, id like to use to test some things, including scopes. So what kind of cable should I be buying. or making? Do I need 50 0hm terminators?

author: tggzzz
author_rank: Super Contributor
timestamp: February 24, 2015, 09:59:08 pm
content: You might find some of the references on this pagehttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/helpful.
Logging output from Keithley 2000 DMM - Page 1
Forum section: electronics / testgear

author: AndyC_772
author_rank: Super Contributor
timestamp: February 18, 2015, 12:45:52 pm
content: Hi all,I have a project which requires accurate measurement and logging of a voltage over a period of time.I have a Keithley 2000 DMM, which has a serial port on the back. I feel there ought to be some data logging software out there which can periodically query the DMM reading, store it and plot a chart, but I can't find anything.This must be a common requirement, so apologies if I'm missing something obvious.Could someone please point me to the logging software that everyone uses?

author: 6thimage
author_rank: Regular Contributor
timestamp: February 20, 2015, 01:10:47 am
content: I am not aware of any available program which will do this without some setting up. I think most people would use labview, but that would involve adding and connecting all the different parts (I don't use labview).For any logging that I end up doing, I tend to write a simple script in python that dumps the data to disk and then use gnuplot to create a graph. It's not as nice as a simple, single GUI, but it does allow it to be quite configurable.On a side note, I have never got my Keithley 2000 to work properly over the serial interface - I have never had much need to log from it as I have a 34461A, with its nice USB interface. But the last time I looked at it, it looked like it was producing +/- 10V serial, which was throwing my USB serial converter off. So it might be worth checking if your serial converter (I'm guessing you're probably not using a computer with a real serial port) works at these voltages.

author: skennedy
author_rank: Contributor
timestamp: February 20, 2015, 03:52:29 am
content: I've used a Keithley 2000 with GPIB or RS232 using MATLAB a bit recently. You will need to check that the settings on the instrument match the config on the PC, parity, stop bits etc. The programming manual is a bit confusing but all you need to do is send commands using query() and fprint() functions. It shouldn't be too much work to get the script to output a csv with timestamps and readings.The free option would be to use one of the python frameworks to help you write some simple code to output the data. But I haven't done this yet.

author: Smith
author_rank: Frequent Contributor
timestamp: February 20, 2015, 06:55:32 am
content: I used the RS232 port under LabView to log some measurements at work. As I remembee to a maximum of 17 readings/sec

author: mikron
author_rank: Contributor
timestamp: February 20, 2015, 08:04:38 am
content: You can read data from your Keithley directly into Excel using Agilent VISA and a few lines of VBA code. I have done this with my Keithley 2015 and a USB-GPIB converter, but RS232 should also work.

author: TiN
author_rank: Super Contributor
timestamp: February 20, 2015, 05:46:04 pm
content: Keithley have software tool for 2000 as well here :ExceLINX-3A Software Version C02 (for Model 2000) (Windows 7, Vista, XP Compatible).Did not try it myself tho, as my only 2000 is broken and not repaired yet. For 2001's,2002,2400,2510 I am using LabView VIs.
Turn your BeagleBoneBlack into a 14-CHANNEL, 100MSPS LOGIC ANALYZER - Page 1
Forum section: electronics / testgear

author: nixfu
author_rank: Unknown
timestamp: February 20, 2015, 04:26:19 am
content: This might be an alternative for the hobbist to a dedicated USB Logic Analyzer.The analyzer can sample signals from 10Hz upto 100MHz, in 8 or 16 bits and up to a maximum of 14 channels. Sample depth depends on free RAM, and upto 320MB can be reserved for BeagleLogic. There’s also a web interface.When used in conjunction with the sigrok library, BeagleLogic supports software triggers and decoding over 30 different digital protocols.Core Specifications:Sample Rate: 10 Hz to 100 MHz [(100/N) MHz; integer N]Sample Size: 8-bit or 16-bit [a maximum of 14 inputs: P8_39 to P8_46, P8_27 to P8_30, P8_20 and P8_21 (after disabling the eMMC)]Sample Depth: Depends on the free RAM in the system. Starting from a minimum of 8 MB upto 320 MB of the system RAM can be reserved for BeagleLogic operation.Sampling Mode: One-Shot or Continuous Sampling, software-triggeredWebsite:https://github.com/abhishek-kakkar/BeagleLogic/wikiIntroduction Video:http://youtu.be/CDbEAq33vdA
Help with NJE Model 10-8 Power Supply - Page 1
Forum section: electronics / testgear

author: xum
author_rank: Newbie
timestamp: February 19, 2015, 11:25:20 pm
content: I just bought a 10 volt 8 amp power supply with no manual.I don't expect anyone here to have a manual, but I thought maybe I could get some terminals on the back of the unit explained to me. The unit powers on with a mighty twang and hum of the transformer energizing, but I can't get voltage out of the leads.Any information would be helpful and I thank you for it.

author: xum
author_rank: Newbie
timestamp: February 20, 2015, 12:19:48 am
content: I notice written on the backside near some of the terminals there are "J"'s with lines drawn to terminals. I'm going to jumper those terminals and power it on, ... see what happens.

author: rdl
author_rank: Super Contributor
timestamp: February 20, 2015, 12:24:03 am
content: Yeah, that's what the label is telling you to do. As a matter of fact, it says to not turn it on unless the sense is connected to something IN GREAT BIG LETTERS, so I hope you haven't already blown it up.

author: xum
author_rank: Newbie
timestamp: February 20, 2015, 12:37:17 am
content: Well, upon closer inspection, there are actually jumpers already in place. To save the trouble of everyone I'll detail the jumper placement. Color coded for your convenience.The left terminal block or TB21) DUALLING2) DUALLING3) PROG4) PROG5) PROG6) MODEThe right terminal block or TB11) Sens Pos2) Out Pos (sticker applied reads 3 3 3 3)3) Cap Pos4) GND5) Cap Neg6) Out Neg (sticker applied reads 1 1 1 1)7) Sens Neg (sticker applied reads 2 2 2 2)Eight) Remote Volt Prog9) Remote Volt Prog10) Remote Volt Prog
Case for a Hameg 8122 - Page 1
Forum section: electronics / testgear

author: ehsmeng
author_rank: Contributor
timestamp: February 19, 2015, 09:51:43 pm
content: I got a reasonably priced hameg 8122 from ebay, but it showed up as on the pictures - naked in a rack mount.Is there any chance in finding a case (the steel sock of default Hameg size from that era) for the 8122 anywhere you think? Will any case do?
Sefram 7341 Multimeter, anybody? - Page 1
Forum section: electronics / testgear

author: Obin
author_rank: Contributor
timestamp: February 16, 2015, 10:05:22 am
content: Saw this one appear on a second-hand website for 150 euro. But Google isn't able to tell me a lot about the unit.I have the (french) manual:http://www.sefram.com/www/Manual_FR/7345.pdfEnglish starts at page 15 of the pdfAnybody have any experience with the brand or know of any possible rebrand scenario for this one?(I know this isn't the 7341, but it looks the same except for the temperature function)cheers

author: Ebivetar
author_rank: Contributor
timestamp: February 16, 2015, 10:19:27 am
content: This is APPA. Check this linkhttp://www.appatech.com/upload/product/techdata11349844589881.pdf

author: Obin
author_rank: Contributor
timestamp: February 16, 2015, 10:25:01 am
content: Aha! Thanks a lot

author: retiredcaps
author_rank: Super Contributor
timestamp: February 16, 2015, 11:59:05 pm
content: Yes, Appa tech is the original manufacturer. Some information.http://mjlorton.com/forum/index.php?topic=97.0https://www.eevblog.com/forum/testgear/which-acdc-(both-together)-dmm-choice-to-buy/edit: and thishttps://www.eevblog.com/forum/reviews/iso-tech-305-dmm-(under-the-hood)/

author: WackyGerman
author_rank: Regular Contributor
timestamp: February 19, 2015, 11:38:26 am
content: RS components also sold these multimeters under their own iso tech brand
Algient MSOX3054A Probes - Page 1
Forum section: electronics / testgear

author: SoR
author_rank: Newbie
timestamp: February 19, 2015, 08:14:58 am
content: Hi guys,Does Algient MSOX3054A works with any current prob and diff prob or only with the Algient one?Thanks in advance

author: AndyC_772
author_rank: Super Contributor
timestamp: February 19, 2015, 08:39:37 am
content: Automatic probe detection will only work with compatible Agilent probes, but the scope has a standard 1M Ohm input and you can set the probe type manually. I use mine with a differential probe made by Pico, and all I have to do to get it to display in the correct units is manually set the attenuation factor.
E-Load instability with low input power - Page 1
Forum section: electronics / testgear

author: jpetras
author_rank: Newbie
timestamp: February 18, 2015, 05:59:34 pm
content: Hi All, can I get your $0.02?I have run into a problem with my use of a BK 8500 E-Load: At low input powers, the load is unable to stabilize.The experiment works like this: attach power supply to e-load and set to 3V w/10mA limit. Set the e-load to 100 ohms.Of course, this circuit should require 30mA. When given more than 30mA, the BK is just fine. But, when given less than the right ohms-law amount, the load gets pretty wild.We also have a Chroma load and it does a good job with this... however, it is considerably more $$$. I was hoping for something a bit smaller (and with USB/RS232/GPIB/etc interface)My questions are:1. General thoughts?2. Although I believe I have ruled this out, is there a supply to load interaction at play here? I am using a Rigol DP832A for the supply.c. Does anyone have a load that can pass the above test? ... or can recommend a load that can?4. Anyone have a BK 8600 who wouldn't mind trying this out?

author: Christopher
author_rank: Frequent Contributor
timestamp: February 18, 2015, 06:02:36 pm
content: Can you try a cap (1uf ceramic // 10/47uf electrolytic) directly across the input sockets on the load ? This has cured instabilities for me in the past before.

author: jpetras
author_rank: Newbie
timestamp: February 18, 2015, 06:54:52 pm
content: Quote from: Christopher on February 18, 2015, 06:02:36 pmThanks Chris. I will give it a shot and let you know

author: Christopher
author_rank: Frequent Contributor
timestamp: February 18, 2015, 08:19:13 pm
content: I've found some loads can be problematic in constant resistance modes. Constant current is the more stable in some cases.I doubt it's the power supply not liking a low current. To try this you could connect a high value resistor to the power supply and measure the output voltage.

author: jpetras
author_rank: Newbie
timestamp: February 18, 2015, 10:11:10 pm
content: Quote from: Christopher on February 18, 2015, 08:19:13 pmThis is part of what I did to prove to myself that its not the supply... unfortunately, I am stuck with CR... although I am tinkering with Constant PowerThanks again