hybridfree/eevblog-posts huggingface dataset:
Symmetric Power Supply with HP 6632B - Page 1
Forum section: electronics / testgear

author: balu
author_rank: Regular Contributor
timestamp: July 03, 2014, 10:22:02 am
content: Sometimes I need a symmetric power supply for test and development. I used two 6632B (System DC Power Supply) in series to get a symmetric power supply. Today you can buy units as a bench power supply for less money (e.g. in Germany for less than 300 Euro). I think to use two 6632B is a better than buying a real symmetric or dual power supply. Because they are expensive or will not deliver the voltage and current with the precision like the 6632B.Advantage:High precision power supplyVoltage range up to +/-20VCurrent range up to 5A per railFull protection for over current or over voltage (remote shut down via external link)Programmable and control via RS-232 or GPIBInexpensively and availableDisadvantageTwo devicesNo synchronized voltage or current setupNo Front-panel Binding Posts (optional)Need many connections to DUT (V+, V-, GND, Sense V+, Sense V-, Sense GND1, Sense GND2)I have built a terminal HUB to reduce the number of connections between the power supply and the DUT.

author: Neganur
author_rank: Unknown
timestamp: July 03, 2014, 10:51:41 pm
content: Haha, zwei Dumme, ein Gedanke. (great minds think alike/ two fools, one thought)guess I'm being a cheap arse though with my plastic box and I also have to place the jumper manually. The sense wires are connected to the binding posts internally.
Global Specialties RC-10 Resistance/Capacitance Decade Box - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: July 03, 2014, 11:22:10 am
content: Having already owned 2 decades boxed, 1 capacitance and 1 resistance I found this helpful device. It's a passive Resistance, Capacitance or RC Series or Parallel decade box with a decent selection of resistors and capacitors with much higher power ratings than my other boxes. All the resistors have a max rating of up to 1W and all capacitors are rated up 600V. The unit allows for just R or C plus switchable RC configurations in series or parallel. The 10% tolerance is a bit higher than I would like but not too bad, it does the job. The metal enclosure is solid and about as wide as a standard piece of bench equipment and about 4-5 inches deep. The test leads it comes with are just too short for my needs so I just use a longer pair I already have. The rotary switch feels tight and of a decent quality. The tolerances all seemed to be well within their specified range with many being spot on. This will be a very helpful additional to my testing and development kit, for a 160 US dollars it has good flexibility for a passive device. They also include a full schematic which is a nice touch. Very helpful.http://www.amazon.com/gp/product/B005T8CVCI/ref=oh_details_o02_s01_i02?ie=UTF8&psc=1

author: Lightages
author_rank: Unknown
timestamp: July 03, 2014, 08:16:45 pm
content: Now that is a cool device.I would get one right now if I didn't have so many things lined up to get done.
Leader 8100 scope?   Are they a descent unit?  Although Ancient. - Page 1
Forum section: electronics / testgear

author: samsmock
author_rank: Newbie
timestamp: June 26, 2014, 06:53:28 pm
content: There is an upcoming sale from a local college aircraft school. They've got some really great stuff, helicopter fuselages, turbines and other fun stuff that I don't dare buy.But they have a lot of several Leader 8100 scopes. I've never dealt with any of their equipment.I'm mostly thinking of bidding and maybe using one occasionally for hobbyist use, and see about selling the others. I really don't need a handful of the things.Are they worth it if I can get them for a song? Is there any value to them to possibly sell off the ones I don't use and recoup a few bucks?Thanks for any info!

author: Vgkid
author_rank: Super Contributor
timestamp: June 26, 2014, 07:37:18 pm
content: 2ch and 100 Mhz, not a bad beginners scope. I cant find a manual online, but i hear Leader is helpfull in that regard.

author: saturation
author_rank: Super Contributor
timestamp: July 03, 2014, 01:47:09 pm
content: Leader is a good brand of the past, along with Trio and Kenwood. Today I think they sell Rigol gear instead of make their own.
UNI-T UT71C high battery current auto shutdown mode - Page 1
Forum section: electronics / testgear

author: mij59
author_rank: Frequent Contributor
timestamp: July 01, 2014, 07:56:58 am
content: Two weeks ago i replaced the battery in my UT71C.Yesterday i wanted use it and again the battery was flat.I left the multimeter in the dc volt setting, and auto shutdown is on.Turns out that the battery current in shutdown mode is about 1 mA !Wondering if there is something wrong with the multimeter.

author: Wytnucls
author_rank: Super Contributor
timestamp: July 01, 2014, 11:03:33 am
content: I had a check on my 71B: After auto power off: 47uADepending on selection, normal current flow varies between 2.7mA and 8.2mA. It goes up to 20mA with full backlight on.So, there is something wrong with your meter.

author: mij59
author_rank: Frequent Contributor
timestamp: July 01, 2014, 11:14:38 am
content: Quote from: Wytnucls on July 01, 2014, 11:03:33 amThank you,https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gifI also checked my Fluke 87V, battery current is 50 uA in power down mode.

author: mij59
author_rank: Frequent Contributor
timestamp: July 02, 2014, 04:08:24 am
content: Quote from: Wytnucls on July 01, 2014, 11:03:33 amSeems like the uc is not in sleep mode.

author: Wytnucls
author_rank: Super Contributor
timestamp: July 02, 2014, 09:24:25 am
content: Try different timings for the APO setting if you haven't done that yet.If you have the equipment, you can check that the 'sleep' bit goes high when the uC commands APO.If the signal is correct and the meter enters APO, but the quiescent current is too high, the Cyrustek iC may be faulty.If everything else if fine, live with the fault, otherwise Cyrustek could send you a new ES51966, if you ask nicely.

author: mij59
author_rank: Frequent Contributor
timestamp: July 02, 2014, 12:56:36 pm
content: Quote from: Wytnucls on July 02, 2014, 09:24:25 amChecked, sleep bit is set just before the meter enters power down mode.I will leave the meter as it is.Thank for the support.

author: Wytnucls
author_rank: Super Contributor
timestamp: July 02, 2014, 05:07:58 pm
content: Might be worth checking the 3.7mA on Vdc during normal operation. If it is reading more than that by a wide margin, there might be leakage somewhere else.

author: mij59
author_rank: Frequent Contributor
timestamp: July 02, 2014, 05:34:20 pm
content: Quote from: Wytnucls on July 02, 2014, 05:07:58 pmBattery current varies a bit, average is about 4,5 mA, seems ok.
Bricked Owon SDS7201 - Page 1
Forum section: electronics / testgear

author: radhaz
author_rank: Regular Contributor
timestamp: June 08, 2014, 01:09:16 am
content: Hello.I managed to brick my scope when the firmware update appeared to hang. I waited quite a while (30 minutes) before cycling power to the scope. Now, on power on the splash screen comes on and a relay clicks and then it reboots. The firmware updater doesn't communicate with the scope, and I hear the usb mount/dismount beeps from my pc.I bought the scope from ebay in late 2011, so it is out of warranty.Is there any service center in the US? Or, even better, does anyone know how to recover the firmware?Thanks in advance.

author: tony3d
author_rank: Frequent Contributor
timestamp: June 08, 2014, 01:28:53 pm
content: Saelig is a distributor for Owen. They have a great service department. I'm sure they can fix it.

author: radhaz
author_rank: Regular Contributor
timestamp: July 02, 2014, 01:32:39 am
content: Got my serial number specific file from Al at Saelig. Ran the updater and my scope is back in business.I bought the scope off of ebay, and they still supported me. Very good customer service.
tektronix tds754A FAN - Page 1
Forum section: electronics / testgear

author: romantao
author_rank: Contributor
timestamp: June 30, 2014, 10:48:32 pm
content: Hi!I recently got hold of a tektronix tds754A on ebay for a very nice price with SPC failure which i quickly repaired by changing the attenuator hybrid relays.I noticed however that the fan is quite noisy and so i wonder if is there any fan replacement "recomended" with similar airflow rates but quieter operation noise. Found recomendations for lecroy in this forum but nothing regarding the tek 5/6/7xx.regards

author: nctnico
author_rank: Super Contributor
timestamp: June 30, 2014, 10:53:20 pm
content: These scopes are quite noisy. If your scope has a big fan then your already have an ultra low noise version you can't even buy. But maybe somebody changed the fan. Which brand/part number is mounted in your scope?

author: romantao
author_rank: Contributor
timestamp: July 01, 2014, 08:57:20 am
content: mine has a comair rotron JQ24F4V 24V 0.25A. Yes its huge!

author: nctnico
author_rank: Super Contributor
timestamp: July 01, 2014, 01:02:56 pm
content: That is the original. Unfortunately fans in that size don't come quieter. I once tried replacing such a fan with a similar sized fan from PAPST (with lots of resistors in series to reduce the speed) but that did not result in any improvement for the amount of noise.

author: leppie
author_rank: Frequent Contributor
timestamp: July 01, 2014, 02:21:48 pm
content: Ouch, that is huge fan... in an odd packageWonder why the scope needs 235CFM+ airflow...

author: dxl
author_rank: Regular Contributor
timestamp: July 01, 2014, 06:13:43 pm
content: Hmm, maybe add a fan speed regulation based on temperature? I own a TDS784D, and the temperature critical things are Acquisition (The DEMUX chips get really hot) and probably the Power supply.If you ever want to hear real noisy fans, power up a HP70000 Spectrum Analyzer.

author: AndyC_772
author_rank: Super Contributor
timestamp: July 01, 2014, 06:54:03 pm
content: Quote from: leppie on July 01, 2014, 02:21:48 pmBecause it dissipates about 400W, that's why. My TDS754D did a great job of keeping the lab warm in winter.Not so much fun on a warm summer day, though.
4 wire/Kelvin test lead wire  - Page 1
Forum section: electronics / testgear

author: croyleje
author_rank: Regular Contributor
timestamp: July 03, 2014, 05:22:15 am
content: Hello everyone hoping someone here can help me out. I am making a new test stand for my LCR meter and trying to locate a source of test lead wire that is shielded and has two conductors so I can take advantage of the wire test mode. I found thishttp://www.newark.com/belden/8451-010100/cable-shld-multipr-1pr-22awg-100ft/dp/02F4053?MER=PPSO_N_P_EverywhereElse_Nonebut would prefer something intended for testing purposes plus its only available in 100' rolls. Any help would be great or any suggestions. Do you think something like the link would be ok.Thank you,Jason

author: ivaylo
author_rank: Frequent Contributor
timestamp: July 03, 2014, 07:55:47 am
content: QuoteSearch ebay for twinax cable. Or send me a PM with address and how much you need, I have some of thesehttp://www.ebay.com/itm/9-Trompeter-PCB0W10PCB-72-PL75-TWC-124-1A-PL75MC-6-Twinax-Triax-Patch-Cable-/301231729791which I've been buying for the connectors and don't need the wire. What is the max frequency of your LCR meter?
Fluke 87-V vs Fluke 87 and alike - Page 1
Forum section: electronics / testgear

author: jancelot
author_rank: Regular Contributor
timestamp: July 01, 2014, 02:30:15 pm
content: Tried to find out what's the difference between Fluke 87 and the others like 87-II, 87-III and 87-IV up to V. I guess there are "major" revisions of the same exact version, but no idea exactly what are the differences and such. Can somebody point me out?

author: dfmischler
author_rank: Frequent Contributor
timestamp: July 01, 2014, 03:03:50 pm
content: The earliest 87 has no IEC category rating. Otherwise, I think it is identical to the next version, which has a 1000V IEC Category III rating. This is a 4000 count True-RMS meter with basic DC accuracy of around .1% + 1 count (.2%+2 counts for mA). Maximum capacitance measurement is 5uF. Frequency measurement to 200 kHz. Green backlight.The 87III is 1000V IEC Category III, 4000 counts. Basic DC accuracy is .05%+1 count (.1%+1 on mV, .2%+4 on mA). Has a 20,000 count hi-resolution mode for some functions. Otherwise very similar to the original 87.The 87IV is a completely different meter. More like the 187 than the 87 or 87V.The 87V is IEC Category III 1000V, and is (mostly) a 6000 count meter with basic DC accuracy of around .05% + 1 count (.1%+1 for mV and .2%+4 for mA, 1%+2 for uA). Maximum capacitance measurement is 9999uF. Frequency to 200 kHz. This meter also has a temperature measurement range, a low pass filter, smoothing feature, hi-resolution mode (20,000 counts in many modes), etc. White backlight.The detailed specifications are all in the manuals which can be found online.

author: dfmischler
author_rank: Frequent Contributor
timestamp: July 01, 2014, 03:29:37 pm
content: I guess I should have just pointed you atthis earlier thread.

author: jancelot
author_rank: Regular Contributor
timestamp: July 01, 2014, 04:03:10 pm
content: Quote from: dfmischler on July 01, 2014, 03:29:37 pmThank you so much!

author: unicornio
author_rank: Contributor
timestamp: July 01, 2014, 04:25:38 pm
content: both, fluke 87III and 87V are very similar in accuracy and in performance, although the 87V is more advanced and has some potential that the 87III has not. meanwhile, there are more failures in 87V series production, that in the 87III series, possibly because 87V sold much more, although there are doubts whether it was manufactured outside the U.S....I have one of each, and the two work very similar, but I really like of the fluke 87III is that it can be calibrated manually, while the fluke 87V have to take it to calibrate to a site that having the so not-cheap fluke 'machine' that automatically calibrates it ...hope this help

author: retiredcaps
author_rank: Super Contributor
timestamp: July 01, 2014, 10:25:41 pm
content: Quote from: unicornio on July 01, 2014, 04:25:38 pmOther than the GSM problem, what concrete problems are you seeing to say there are more failures with the 87V?All Fluke 80 series are made in the USA.
Service manual for HP/Agilent 6634A with schematics - Page 1
Forum section: electronics / testgear

author: bernroth
author_rank: Regular Contributor
timestamp: June 30, 2014, 08:55:15 pm
content: Hello!I have been searching the service manual for the HP/Agilent 6634A system power supply in order to do a proper calibration of a used unit.Anyone has already found the service manual?Best regards,Bernhard

author: AndyC_772
author_rank: Super Contributor
timestamp: June 30, 2014, 09:00:45 pm
content: http://cp.literature.agilent.com/litweb/pdf/5957-6365.pdf

author: bernroth
author_rank: Regular Contributor
timestamp: June 30, 2014, 09:02:36 pm
content: Shame on me...Thank you for the link
old HP logic analyzer or modern USB logic analyzer? - Page 1
Forum section: electronics / testgear

author: ice595
author_rank: Regular Contributor
timestamp: June 30, 2014, 03:38:33 pm
content: Both the old HP logic analyzer and modern USB logic analyzers cost around $150-200 USD, what are the main differences besides protocol support and bandwidth?Im currently using my dual channel DSO as a crude logic analyzer right now but I need more channels.Should I buy the USB logic analyzers for their protocol support or the bench top HP logic analyzer which looks coolerI probably won't get the old HP logic analyzers that use an internal hard drive as it might die very soon.

author: TiN
author_rank: Super Contributor
timestamp: June 30, 2014, 03:50:10 pm
content: Dunno about HP, but Tek's TLA have multiple channels with plenty of memories.But new USB Saleae Pro are really nice;Benefit of USB LA is that they are small and easy to use, which covers 99% of needs of usual real-life applications.

author: zapta
author_rank: Super Contributor
timestamp: June 30, 2014, 06:01:45 pm
content: The 'real' logic analyzers will give you richer triggering. I am happy with the Saleae 8 channel.

author: nctnico
author_rank: Super Contributor
timestamp: June 30, 2014, 06:36:52 pm
content: How about a mixed signal oscilloscope?

author: calin
author_rank: Regular Contributor
timestamp: June 30, 2014, 06:50:31 pm
content: I have an old HP beast and an "el cheapo" china Saleae clone somone gave it to me as a sample of "china made crap". Beleive it or not I find my self using the clone more than the old HP beast. True the HP has more triggering options, more speed etc but like someone said above me .. the USB one is enough for 99% of the work if you work with protocols like SPI, I2C , etc which are not that high speed that crappy toy will do.

author: PaulAm
author_rank: Frequent Contributor
timestamp: June 30, 2014, 07:27:09 pm
content: If you don't need 192 channels and very complex triggering, you can probably live with the USB. If it's fast enough for what you're doing, it will cover almost all of your requirements.You can also find things like the HP 54620a I just picked up for $50. 16 channels and 500 MHz acquisition. No serial protocols, of course, and not expandable, but it covers a lot of smaller projects. I actually bought it to get the cable for my 54645d MSO.I have a 16500b mainframe loaded out, but I don't bother hauling it out if I can make do with 8 or 16 channels. They are fun toys to play with and with their programmatic ability, there's not much of a limit to what you can do with them.
What do you think about the Tektronix PSU PWS2185? - Page 1
Forum section: electronics / testgear

author: mcinque
author_rank: Unknown
timestamp: March 10, 2014, 08:35:18 pm
content: http://www.tek.com/pws2000-dc-power-supplyI've searched for any review and/or teardown about this PSU but I found nothing.Besides, I can't understand if it's a Keithley rebranded Tektronix or the opposite.Anyone of you owns this model?

author: Bored@Work
author_rank: Super Contributor
timestamp: March 10, 2014, 10:33:04 pm
content: Quote from: mcinque on March 10, 2014, 08:35:18 pmIn this particular case it shouldn't matter much. Keithley and Tek are both owned by the evil Danaher Corporation. And Danaher dictated that Keithley should be added to Tek.

author: w2aew
author_rank: Super Contributor
timestamp: March 11, 2014, 03:45:06 am
content: Quote from: Bored@Work on March 10, 2014, 10:33:04 pmTek came out with this power supply before Tek's Keithley acquisition. Now that Keithley is a Tektronix company, I suspect that future power supply products will be Keithley products, since they are the "DC" equipment brand.

author: mcinque
author_rank: Unknown
timestamp: March 11, 2014, 12:17:31 pm
content: But what about its reliability and internal engineering?

author: Drirr
author_rank: Regular Contributor
timestamp: June 29, 2014, 04:44:32 pm
content: @mcinquehttps://picasaweb.google.com/104378593109746079667/PWS2326?authuser=0&feat=directlink

author: mcinque
author_rank: Unknown
timestamp: June 29, 2014, 07:13:29 pm
content: Thank you!!EDIT: what a terrible work with that chip erasing... except that, seems well built! I've never heard the brand of the main caps, I wonder if they are more on Rubicon quality or Capxcon

author: Vgkid
author_rank: Super Contributor
timestamp: June 29, 2014, 10:02:51 pm
content: They are lelon lsg 105C 2k hours, the only reliability info is a badcaps post from 2010. So who knows.
new TI9x thermal cameras from Fluke - Page 1
Forum section: electronics / testgear

author: ixfd64
author_rank: Frequent Contributor
timestamp: June 30, 2014, 12:10:18 am
content: Fluke just released a new 80 x 60 thermal camera for $1,499.95 and a 80 x 80 one for $1,999.95:http://source.theengineer.co.uk/measurement-quality-control-and-test/vision-sound-and-vibration-testing/thermal-imaging/fluke-ti90-and-ti95-thermal-cameras-provide-accurate-inspections-from-safer-distances/2018679.articleI wonder if they're hackable?

author: echen1024
author_rank: Super Contributor
timestamp: June 30, 2014, 01:54:54 am
content: I wish that they would put a better camera sensor in these devices. That is one of my chief issues with the E4. 5 and 8, and even 13 MP sensors are getting so cheap nowadays.
Agilent MSO7000B Series  - USB Printer suggestion please  - Page 1
Forum section: electronics / testgear

author: HighVoltage
author_rank: Super Contributor
timestamp: June 27, 2014, 09:17:21 am
content: I just got my MSO7000B Series Oscilloscope and although it is an amazing machine, it can not print to my LAN printers.The user guide suggest an USB printerSo, my question is, if anyone has a good experience with a good USB printer to be used on this scope?Please give some suggestions of printers that work good.May be also, if you have any bad experience with printers on the MSO7000B as well.Thanks for any suggestions and help.

author: Neganur
author_rank: Unknown
timestamp: June 27, 2014, 01:27:02 pm
content: not sure if this helps you, but I just connect the scope to the intranet and configure it to print to a network printer (enter the IP of the printer).Only trouble I've encountered is that the scope seems to default to the paper size 'letter' and I have to manually acknowledge on the printer that it prints with A4 instead. (I use an HP4100n laser and it displays an error indicating that a wrong paper format was requested)EDIT: since you said that your scope cannot print to LAN (I assume the devices are both set to belong to the same subnet etc.) did you run into a similar problem of wrong paper size or does the scope not acknowledge finding the printer on the set IP?

author: HighVoltage
author_rank: Super Contributor
timestamp: June 27, 2014, 09:51:17 pm
content: Hello Neganur and thanks for the feedback.Did you really get the Agilent MSO7000B series connected to the Network Printer?On my MSO7054B it will only connect to an USB printerMy Agilent 2000 X Series scope had no problems, connecting to the LAN but it seems the 7000B Series can not do it.
Unknown Tek 491 connector? (With teardown) - Page 1
Forum section: electronics / testgear

author: QuantumPhys
author_rank: Contributor
timestamp: June 10, 2014, 01:36:45 am
content: Hi,I just got a Tek 491 10MHz-40GHz spectrum analyzer (40GHz with external mixer) for USD110 on EBay. It was claimed to be working, but Band B (275MHz-2GHz) has a missing part, which is most probably a N to ? connector converter. However, due to my lack of experience in RF, I have no idea what the connector is called, so can anyone please enlighten me on what the connector is, and even better, tell me how to get a N to ? adaptor? Thanks! (bonus teardown attached).Best regards,QuantumPhys

author: QuantumPhys
author_rank: Contributor
timestamp: June 10, 2014, 01:45:12 am
content: Bottom of the analyzer.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: June 10, 2014, 02:09:22 am
content: Hi,The connector is an SMB connector.Regards,Jay_Diddy_B

author: frenky
author_rank: Unknown
timestamp: June 10, 2014, 08:04:07 pm
content: Here is the manual:http://bama.edebris.com/download/tek/491/491-spectrum-analyzer.pdf

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: June 10, 2014, 09:03:02 pm
content: The missing parts is item 46 on the front panel assembly. It is described as:-46 103-0057-00 ADAPTER, connectorSo it may just be an adapter from N to SMB.The spectrum analyzer may work on band A without the adapter. The adapter looks like it is part of the band B input section.Jay_Diddy_B

author: QuantumPhys
author_rank: Contributor
timestamp: June 28, 2014, 11:32:18 am
content: Thanks! Got band A working, and I have ordered the converter on EBay. Hope that the performance will not be affected too much!
Anyone have calibration procedure for UEI DM397 ? Or ANY UEI DMM ? - Page 1
Forum section: electronics / testgear

author: Lefuneste
author_rank: Contributor
timestamp: June 26, 2014, 09:19:33 pm
content: Hi guys. In my quest for accurate measurement, I would like to find out if I could find somewhere the calibration procedure for the UEI DM397 DMM. This DMM is not perfect as most of you know, but out of the box it has nice specifications. I scored one brand new one a year and half ago for a ridiculous price, and I am quite pleased with it, apart from few ergonomic glitches. Now I've tried to measure a reference voltage source that I got, and against other DMM I own. It appears to be slightly out of specs at least on DC voltages. As this DMM has a good resolution, and supposedly an excellent precision of 0.05% on most DC ranges, I was wondering if someone knew the procedure to calibrate it. As it is stated to have a "closed case" calibration (lol), it must be some sort of tweaks at start up, pressing and holding some buttons. Most recent UEI DMM probably share the same procedure, so if someone knows how to enter the calibration mode on one other model, let me know. From what I've read on this forum, UEI does not provide this type of documentation. I have asked BK Precision the same procedure a few weeks ago, and they sent it to me without any problem... "Some brands are bigger than others" as the Moz would say...Thanks for you help !!

author: Lightages
author_rank: Unknown
timestamp: June 27, 2014, 12:15:07 am
content: The UEi DM39X meters use a specific piece of software from UEi to do the calibrations. There are no special button presses. Sorry I cannot share the software with you as I obtained it under agreement of non-disclosure with UEi.

author: Lefuneste
author_rank: Contributor
timestamp: June 27, 2014, 12:40:05 am
content: Thanks for the information ! It's still quite useful to know this anyway... Then I am screwed... I'll sell it and get a Brymen instead...
Hioki DT4252 - Page 1
Forum section: electronics / testgear

author: levent
author_rank: Newbie
timestamp: July 06, 2014, 01:33:51 pm
content: Hello, I am new in this forum (sorry for my English), but I have been watching David's reviews for a long time.I am an electronic technician who works for a big brand for central repair technical service and interesting DMM's which from Japan, Hioki brand. It looks solid and stable, I have used Fluke 177, 179, 279. Especially 279 seems to me slow response time, slow booting time etc. (at least for me) so I was searching for a DMM that is good, solid and has fast response time then I have found out Hioki 4000 series; DT4252 and I have been using it a couple of days it's really solid and fast enough (but just for me)Anyway, actually what I want to say is; could I ask for a review about Hioki DT4252 and DT4282 DMMs from Dave Jones, I'll be so pleasedif he could.Thanks

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 06, 2014, 01:37:10 pm
content: Have you seen this?https://www.eevblog.com/forum/testgear/hioki-dt4252-teardown/

author: radhaz
author_rank: Regular Contributor
timestamp: July 07, 2014, 06:24:04 am
content: That's an interesting line of meters. Looks to be high quality construction and good features. Does anyone have the higher end of the 4200 series, or even the earlier high end series?
Elgar SW5550A CSV File Help - Page 1
Forum section: electronics / testgear

author: ICGEngineerTech
author_rank: Newbie
timestamp: June 26, 2014, 07:28:34 pm
content: Hello,I have an old Elgar SW5550A (P/N SW5550A-1-3-2) and I have been programming my own waveforms. I have been using Excel and exporting to a .CSV (comma separated value).The Elgar requires 4,096 data points (cells). The range of each data point represent the value of the waveform you're making. The values of 1 to 2048 represent the negative part of the waveform and the values 2049 to 4096 representing the positive part of the waveform.My question is: Does anyone know of a source to find nice waveforms that are already created in this fashion? Also: Can anyone tell me a good spline curve maker that can export the data to a CSV file? I thought of using PhotoShop or Gimp and making a canvas of 4096 x 4096 pixels and then drawing my waveform. I just don't know if it is possible to export drawn waveform to a file format such as CSV or something that will give me access to the actual numerical value of each point on my drawn waveform.Can anyone help out with a source of waveforms for the SW5550A or a way to draw my waveforms and spit out the numerical value?Thanks so much.
HP 3326A value untested - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: June 26, 2014, 08:39:49 pm
content: I've on Ebay a HP 3362 2 channel synthesizer with no guarantee that it is working...Im not sure if I should go for it or not or if this item might be easy to repair...Do you think around US$ 300 is too much for this item?

author: wn1fju
author_rank: Frequent Contributor
timestamp: June 26, 2014, 11:28:00 pm
content: First of all, I assume you meant to say HP 3326A, not 3362A. What is easy to repair for one person might be hard for another. However, let me warn you that there about 30 little boards in the thing, each enclosed in their own metal compartment. So you might need a good set of extender boards. The service manual is a work of art and the unit has an elaborate set of self-tests and diagnostics. However, unless it is a power supply problem, which should be fairly straightforward to repair, you could be entering the world of ECL chips and proprietary HP ICs. With a lot of duplication between the two channels, at least board swapping can tell you a lot. The one I have was an easy fix - channel A was working, but channel B was not. Took off the case, reattached the dangling coax cable, and presto! But I think that's the exception, not the rule. $300 is OK, but not great, for a working unit. A buddy of mine bought one on eBay a couple of months ago for less than $100 in "condition unknown," and he got lucky - it worked fine. I didn't spend more than $100 for mine either a few years ago. I wouldn't take a chance for $300, but that's simply my threshold of pain. You probably can do better if you keep an eye out on eBay for a while. Having said all of this, the 3326A is a great piece (for moderate frequencies) and does a lot of cool stuff well.
HP 5335A A13 Line Module change - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: June 26, 2014, 01:25:01 pm
content: HelloI just received my HP5335A form the US yesterday and want to like to change it from 115V AC to 230V AC...According to the service manual the A13 line module contains the line filter as well as a printed circuit board to do the switching between 115/230V AC.Looking at the line module I don't see any printer circuit board nor how I can remove it without probably dismount almost anything at the back (o;

author: Dr. Frank
author_rank: Super Contributor
timestamp: June 26, 2014, 02:00:40 pm
content: Don't know, which (old) version you have.In the manual it's described on p 2-1, that line voltage is to be selected on the rear, accessible from outside the case. You do not even have to disassemble the caseThe card sits under a window underneath the line jack, and can be pulled out, then turned in the right direction.Need a copy of the drawing?Frank

author: davorin
author_rank: Unknown
timestamp: June 26, 2014, 02:26:03 pm
content: My eye sight is really poor....now saw the small pcb just below the fuse holder...Eh voilà...got a working 5335A now :-)Now if just the Chinese would ship my GPS module faster ;-)Just wondering though if either the 5335A's reference isn't stable or my 8904A doesn't output a stable frequency...

author: Dr. Frank
author_rank: Super Contributor
timestamp: June 26, 2014, 02:44:06 pm
content: Which options does the Instrument have?OCXO? Or the ordinary XTAL oscillator?PS: You are also well over 45 ?Whenever I need to access the back side of my 5335A , I need eye glasses..Frank

author: davorin
author_rank: Unknown
timestamp: June 26, 2014, 02:51:12 pm
content: No it's just the regular XTAL version....have a few OCXO here..but the GPS 10kHz module didn't arrive yet....Hmm....is there any service manual of the option 010 available?Would maybe make sense to incorporate the 10MHz OCXO and feed it at the back with the GPS 10kHz signal...

author: Dr. Frank
author_rank: Super Contributor
timestamp: June 26, 2014, 03:49:13 pm
content: Yes, for the 10811 family, a complete manual incl. schematics is online, hp, or in the usual place...http://www.ko4bb.com/manuals/index.php?dir=HP_Agilent/HP_10811_Crystal_Oven_Oscillatorexternal ocxo makes sense also, although a fitting 10811 is more convenient.And which GPSDO so you get? May hang in the customs...

author: davorin
author_rank: Unknown
timestamp: June 26, 2014, 03:53:59 pm
content: Shouldn't be a problem with electronics from China as I live in Switzerland...Most shipments are tax free now since last year...just takes 3 to 4 weeks until it arrives here...

author: davorin
author_rank: Unknown
timestamp: June 26, 2014, 04:09:45 pm
content: Thought I shoot a picture of the line mode PCB it was talked about...The fuse has to be removed with the plastic lever before the PCB can be pulled out.It shows how the PCB needs to be inserted for 230V AC operation.
Rigol DSA-1030atg ref osc tweak? - Page 1
Forum section: electronics / testgear

author: Andy2
author_rank: Contributor
timestamp: June 26, 2014, 03:32:00 pm
content: I see there is a tweak facility for the ref osc in the DSA-815, but as the key labels are different on the 1030 this won't work. There must be a similar thing for the 1030, but I can't find out. Many thanks.
Fluke 189 Auto Power Off - Page 1
Forum section: electronics / testgear

author: jmoreland79
author_rank: Regular Contributor
timestamp: June 24, 2014, 02:32:35 pm
content: I have probably three times in the last six months killed the batteries in my 189 because I forgot to turn it off (careless, I know). I've heard that the Auto Power Off isn't complete with the 189, so perhaps this is normal if it's left "on" say, over a weekend.However, I've found it on several occasions where it's set to power off after fifteen minutes, but I've gone back to it two or three hours later and it is fully on. But it's sitting on a bench with other equipment and I'm primarily dealing with AC, so it's possible it's inducing enough voltage to where it thinks it's still being actively used.Bottom line is I should be turning it off, but just sometimes I get pulled away for what I think will be five minutes and it ends up being a couple hours. If this behavior is normal, so be it, it's just been bugging me.

author: xwarp
author_rank: Frequent Contributor
timestamp: June 24, 2014, 02:57:00 pm
content: I have a 189, but have not used it enough to notice that issue.Will check mine and see what happens.

author: sunnyhighway
author_rank: Frequent Contributor
timestamp: June 24, 2014, 03:05:25 pm
content: According to the manual:Quote

author: jmoreland79
author_rank: Regular Contributor
timestamp: June 24, 2014, 03:49:50 pm
content: Quote from: sunnyhighway on June 24, 2014, 03:05:25 pmYeah, in those modes it makes sense, but out of those I only use the Logging mode occasionally. Hmm...

author: Gallymimus
author_rank: Regular Contributor
timestamp: June 26, 2014, 05:10:07 am
content: Never had a problem like this with ours (we have 2)
U1272A Smooth mode - How do the settings work? - Page 1
Forum section: electronics / testgear

author: mjkuwp
author_rank: Unknown
timestamp: June 25, 2014, 02:37:20 pm
content: hi all,Before I spend hours reverse-engineering this... I wonder if anyone has figured out how the parameter "SMootH" in the menu works. I found information in a couple of different forums but I think the firmware and user manual have changed since then. The old references refer to low/med/high but this does not exist anymore.Generally the mode is disabled or enabled. disabled has a range from 0001 to 9999, likewise enabled has a range from 0001.E to 9999.E. "E" standing for enabled. I understand how to enable and disable and change the setting but I don't know how to choose a value.Perhaps these are linear ranges of filtering but I would love to have an idea of the filter type and time constants. Also...why is there a range for disabled. I would think disabled would just be 'yes' or 'no'.thanks in advance!PS link below - not sure if this will work for everyoneuser manual - smooth mode is on page 128 as printed or the 148th page of the pdfhttp://cp.literature.agilent.com/litweb/pdf/U1271-90010.pdf
Instek DSO Erratic Horizontal Encoder - Page 1
Forum section: electronics / testgear

author: AcHmed99
author_rank: Contributor
timestamp: June 24, 2014, 10:09:10 pm
content: I’ve been having some issues with the Horizontal (time base) on my Instek GDS2102. When I turn the encoder it jumps erratically, sometimes increasing when I’m turning for decreasing and skips steps. For example I’ll be at say 5uS/div I turn the dial one indent and it jumps to 5mS/div or something. Sometimes it won't even register a turn.I’m sure I’ve seen this somewhere on the forum and usually cleaning the encoder works. What’s a good product to use to do that, or any other suggestions on a cause and a fix?

author: echen1024
author_rank: Super Contributor
timestamp: June 24, 2014, 10:57:07 pm
content: Techspray? Or use a bit of Methanol?
Turn off auto power off on UT139C? - Page 1
Forum section: electronics / testgear

author: lpc32
author_rank: Frequent Contributor
timestamp: June 24, 2014, 03:09:05 pm
content: Any idea how you can turn off the auto power off on a UniT UT139C? What's the method on their other models?

author: sunnyhighway
author_rank: Frequent Contributor
timestamp: June 24, 2014, 05:39:43 pm
content: ?According to the manual it should be possibleQuoteAlso:Quote

author: lpc32
author_rank: Frequent Contributor
timestamp: June 24, 2014, 06:34:04 pm
content: Thanks. Even after your quote it took me a while to find out where it is in the manual.
Datentechnik MS2-TD serial data generator teardown - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: June 23, 2014, 06:02:37 pm
content: I bought an old piece of com test tech for 2 EUR, just for the box and parts, thought I'd do a little teardown:http://www.daqq.eu/?p=972Nothing particularly interesting in there.Enjoy,David

author: radhaz
author_rank: Regular Contributor
timestamp: June 23, 2014, 11:41:03 pm
content: Very nice tear down.

author: Vgkid
author_rank: Super Contributor
timestamp: June 24, 2014, 01:45:39 am
content: Thanks for the teardown, it is easily worth what you paid for it in 4000 series logic alone.
Last question about DER DE-5000: Any USA import fees? - Page 1
Forum section: electronics / testgear

author: Steve Zarg
author_rank: Contributor
timestamp: June 23, 2014, 08:56:36 pm
content: I want to order one of the DER DE-5000 kits from a ebay vendor in Japan. I live in U.S.A.I'm wondering; Are there any surprise import fee charges when the package arrives?Thank You.

author: georges80
author_rank: Frequent Contributor
timestamp: June 23, 2014, 09:22:38 pm
content: None for me - you should be fine. It's only a $120 or so device...I guess you haven't ordered much from asia eh?cheers,george.

author: theatrus
author_rank: Frequent Contributor
timestamp: June 23, 2014, 09:45:01 pm
content: I've never been hit with import fees from any Asian countries.The EU on the other hand... Its a weird world.

author: Steve Zarg
author_rank: Contributor
timestamp: June 23, 2014, 11:31:39 pm
content: Thank You.

author: mzzj
author_rank: Super Contributor
timestamp: June 24, 2014, 08:54:35 am
content: Quote from: theatrus on June 23, 2014, 09:45:01 pmSame here, Chinese orders usually get past customs but shipments from usa are always stuck at customs even if the value would be below the limits.Probably at least 2 reasons:1. people order huge quantities of cheap chinese crap and customs are overloaded with it2. shipments from US are more valuable and more often above the 20eur "taxfree limit"

author: jpb
author_rank: Super Contributor
timestamp: June 24, 2014, 12:07:45 pm
content: In the UK I had to pay import duty when importing my DER DE-5000 from Japan, it was not much (£12 I think) but the slightly annoying thing was having to pay it on the total cost including the postage.Still, nothing like as annoying as paying VAT on fuel where the government charges us tax (VAT) on the tax (fuel duty) that they have already charged us!

author: GreyWoolfe
author_rank: Unknown
timestamp: June 24, 2014, 02:07:44 pm
content: I also purchased a Der De-5000 and there was no import fee. I believe the price was $120 USD with the adapters and shipping added on to that.
ds2072a vs ds2072a-s - Page 1
Forum section: electronics / testgear

author: mgj3030
author_rank: Newbie
timestamp: June 17, 2014, 10:51:45 pm
content: Is the waveform generator worth the extra money.?

author: true
author_rank: Frequent Contributor
timestamp: June 18, 2014, 02:49:08 am
content: Can you use it? Is the extra price justified?As for my opinion, no. Maybe in the DS1000 price bracket and below, just barely, but if you're willing to spend >$1000 on a scope and function gen, you're probably better off getting discrete units.

author: AintBigAintClever
author_rank: Regular Contributor
timestamp: June 18, 2014, 11:35:20 am
content: I bought the DS2072A-S because I thought it would be a useful feature to have, and for me it IS a useful feature. However, if you're in the market for a new 'scope the question to ask right now isn't "DS2072A or DS2072A-S", it's "DS2072A, DS2072A-S, MSO2072A or MSO2072A-S" because the mixed signal oscilloscope versions have been added to the range. Had I known, I'd probably have waited for the MSO (then been annoyed by the inevitable launch of a 4-channel MSO2074A-S).Here's the link to Rigol's new datasheet covering all four models in the 2000 range:http://int.rigol.com/download/Oversea/DS/Datasheet/MSO_DS2000A_DataSheet_EN.pdf

author: Dave Turner
author_rank: Frequent Contributor
timestamp: June 18, 2014, 07:47:22 pm
content: For me it was the choice between the DS1074z and the DS1074z-s.I chose the z-s as I am extremely limited for space which was the right choice at the time and I'm not disappointed with my purchase.

author: Fagear
author_rank: Regular Contributor
timestamp: June 18, 2014, 10:48:05 pm
content: I've shot the review about "-S" AWG, it seems like this generator in DS1000Z and DS2000A is the same.One note: voiceover is in Russian.????? ? DS1000Z/DS2000A

author: Doug_T
author_rank: Contributor
timestamp: June 23, 2014, 05:57:56 pm
content: Does the 2072a-s signal generator make use of the navigation knob in setting the frequency?Also, the 1000z-s user manual has a section on its signal generator but I haven't yet found a pdf mentioning operation of the 2000-s signal generator. (Just another newbie doing the proverbial 1074Z-s vs 2072a-s gnashing of teeth.)
NI VirtualBench - Page 1
Forum section: electronics / testgear

author: frenky
author_rank: Unknown
timestamp: June 23, 2014, 01:06:51 pm
content: National instruments has released new kind of "All-in-One Instrument".http://www.ni.com/virtualbench/Priced €1690 this is surely not targeted at hobbiest? You could easily buy separate instruments for lower price.And why no android support? I guess all NI executives have ipads but that is not the reason to ditch the android support.

author: echen1024
author_rank: Super Contributor
timestamp: June 23, 2014, 03:57:42 pm
content: It's targeted at the educational sector where iPads have the foothold. If Google gets more serious about Android in the school, then they will surely add android support.

author: Bored@Work
author_rank: Super Contributor
timestamp: June 23, 2014, 05:32:04 pm
content: https://www.eevblog.com/forum/testgear/ni-virtualbench/
Hantek HDG2022B  Signal Gen,  yes or no - Page 1
Forum section: electronics / testgear

author: Dutchman
author_rank: Newbie
timestamp: June 23, 2014, 03:58:31 pm
content: I'm on the fence for one of these. Seems you can only get this via ebay (Chinese seller) for about $400.00There is a thread here already on how to hack the 5Mhz function, but not to much on the likes or dislikes.I like that it has a large screen, and it seems to have quite some capability..For those that have one, can you give me some feedback / likes / dislikes.Or are there better alternatives out there (in that price range).Thanks in advance..Bart
Rigol DS2000 input offset question - Page 1
Forum section: electronics / testgear

author: jlmoon
author_rank: Unknown
timestamp: June 23, 2014, 03:51:15 pm
content: Hello,Has anyone noticed any vertical amplifier offset (no signal applied with 50 ohm termination on input AC or DC coupling) in the range of 100 - 200 uV when in the 500uV / div range. I also noticed that channel 1 has a bit more than channel 2. My particular model is a DS2202, are we splitting hairs with a Chinese scope playing in the grass?
... - Page 1
Forum section: electronics / testgear

author: cleaningOut
author_rank: Contributor
timestamp: June 24, 2014, 02:17:26 am
content: ...

author: ozwolf
author_rank: Regular Contributor
timestamp: June 24, 2014, 03:03:44 am
content: Really, you expect much of a reply in 32 minutes? Most people are still at work, and won't read this forum until tonight (Australia time).Where are you located? If you're near Brisbane, I'd be interested.

author: VK5RC
author_rank: Unknown
timestamp: June 24, 2014, 04:07:08 am
content: I know that many are interested in older electronic equipment especially Heathkit through the ARRL, the amateur radio organisation in the USA. There are several historical radio /electronic groups who could help if if you want to do it yourself or if you want to 'pass it on' may be able to offer a small reimbursement. I passed on some old transceivers 3BZ to the Australian equivalent as I didn't have the time (and valves and then young people don't mix) I was sent a great photo of the restoration one guy did, it looked brand new. :-)

author: xquercus
author_rank: Contributor
timestamp: June 24, 2014, 05:06:20 am
content: As others have suggested Heathkit gear can be quite collectible. They may not necessarily have a great deal of monetary value but there is a dedicated community of heathkit restoration aficionados. I've had a few friends along the way that have re-purchased every piece of heathkit gear they had as part of their novice station as a teenager -- all beautifully restored and dripping with interesting stories. And then they move on to re-purchase each peice of gear they got when they upgraded their licence. It's really very interesting. With that said, I wouldn't suggest you spend more than a few dollars to pick these up if they aren't free. If you do pick them up, however, once you find the right person you'll get to hear some very interesting stories about how he or she had that exact piece of gear back in 1970 and have been meaning to pick up another one to restore. Some people collect HP test gear or Tek scope -- others collect Heatkit gear. The Heathkit crowd really is a fun bunch.

author: commongrounder
author_rank: Frequent Contributor
timestamp: June 24, 2014, 10:35:53 pm
content: The cases on some of them separate around the front panel edge. The case sides and back are spot welded together.

author: xquercus
author_rank: Contributor
timestamp: June 25, 2014, 04:49:21 am
content: Aw, that's too bad. You probably found the manual but just in case:http://old-timers.tuars.com/qm-1/qm-1.htmhttp://old-timers.tuars.com/qm-1/qm-1man.pdf
Are the new Rigol MSO 2000A series a good buy? - Page 1
Forum section: electronics / testgear

author: wlanfox
author_rank: Newbie
timestamp: June 22, 2014, 07:59:48 pm
content: Hello,Looking into buying a nice hobby oscilloscope looking at Rigol MSO2000A series, but since is very new as of 6/22/2014. looking for any reviews or first hand on impressions, if anyone in the forum has had a change to play with it I will appreciate your input. Specially whit the logic analyzer portion.Thanks,

author: josem
author_rank: Regular Contributor
timestamp: June 22, 2014, 11:08:28 pm
content: I've got the MSO2072A on pre-order and delivery expected 2nd wk of July.The vendor called me saying he would have one MSO2102A (100Mhz) for delivery later this week if I wanted that one instead.Not sure what to do, it's almost £200 more for "just" the 30Mhz extra bandwidth upgrade to 100Mhz so I'll probably wait.I wish it came with protocol decode out of the box... or at least that software option didn't cost the same as a whole Saleae.