hybridfree/eevblog-posts huggingface dataset:
Rigol DS 1054Z unlock  - Page 1
Forum section: electronics / testgear

author: mikeydread
author_rank: Newbie
timestamp: April 22, 2017, 08:52:27 pm
content: I am having a hard time unlocking my Rigol DS 1054Z my unit is new, it's only a few days old. every time i put i the key code its and tap the apply button it's telling me to wait 12 hours.bMy board is version 1.4, also i update to the latest os before i tried to unlock it. Any help will be thankful. Thanks in advance for any help.

author: ebclr
author_rank: Super Contributor
timestamp: April 22, 2017, 09:35:23 pm
content: " i update to the latest os before i tried to unlock"Big mistakeUpdate is easier whit knowed firmware versions.Maybe you come to the party after everybody is drunk, and the party is over, I would suggest to look for ways to rollback firmware, do the trick and then update.\\I did this on mine and is working on the 00.04.04

author: mikeydread
author_rank: Newbie
timestamp: April 23, 2017, 02:05:50 am
content: I also did the firmware upgrade first before i tried to unlock

author: ebclr
author_rank: Super Contributor
timestamp: April 23, 2017, 02:27:16 am
content: What procedure did you use ?

author: Hydron
author_rank: Super Contributor
timestamp: April 23, 2017, 01:22:20 pm
content: I have not seen any reports about unlock being firmware dependantI suggest double checking the serial number etc is correct and re-generating the code (use DSER, not DSFR)Enter it via SCPI command over telnet (easier than using the fiddly knob, and can copy/paste), should be instructions on the forum somewhere on how to do it.Hope you enjoy using the new toy, and if you feel like voiding the warranty even more, then there are instructions on the forums about replacing the intensity/selection knob encoder with a detented encoder, and also a lot of people have swapped the fan for something quieter (I swapped the stock Sunon fan with a lower noise Sunon in mine).

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: April 23, 2017, 07:29:08 pm
content: Quote from: Hydron on April 23, 2017, 01:22:20 pmAgree completely. There have not been any reports of the unlock not working on the newer versions of the firmware. Don't bother wasting your time on trying to downgrade. Go back and carefully re-read the unlock instructions and try again.

author: ebastler
author_rank: Super Contributor
timestamp: April 23, 2017, 08:39:10 pm
content: Quote from: ebclr on April 22, 2017, 09:35:23 pmThis is a red herring. What are you talking about?!I am not aware of any reports of unlocking issues after a firmware upgrade (to whatever version). In contrast, there is plenty of evidence in the forum that firmwaredowngradesare not supported in the DS1000Z series. So you manage to give two pieces of bad advice in one post here...
looking for LeCroy LW420A Arbitrary Waveform Generator firmware - Page 1
Forum section: electronics / testgear

author: highroller
author_rank: Contributor
timestamp: April 19, 2017, 02:36:51 am
content: Hi,I'm looking for the firmware install disk or floppy disk image to boot a LeCroy LW420A Arbitrary Waveform Generator which I bought used without the diskThanksDom

author: abraxa
author_rank: Frequent Contributor
timestamp: April 19, 2017, 06:13:02 pm
content: Since this is an older model, I suggest you try the LeCroy yahoo group athttps://beta.groups.yahoo.com/neo/groups/LeCroy_Owners_Group/infoas well.
Portable Spectrum Analyzer Question - Page 1
Forum section: electronics / testgear

author: tecman
author_rank: Frequent Contributor
timestamp: April 19, 2017, 04:59:06 pm
content: Can anyone comment on high end portable spectrum analyzers (like the R&S line), what is used for the LO for the mixers. Traditionally a YIG oscillator is used, but these portable units seem too small and not power hungry enough to use a YIG.So what is the trick for a tunable, stable oscillator that is used in these devices ?Are they as accurate and stable as traditional "luggable" units ?Paul

author: SaabFAN
author_rank: Frequent Contributor
timestamp: April 19, 2017, 06:11:44 pm
content: Most likely they use one of the PLL-ICs from Analog Devices or other manufacturers.Those chips employ one or several VCOs with divider-circuits at the output and are locked to the main oscillator.One example would be the ADF4351, which can go from 35 MHz to 4.4 GHz. Well inside the LO-Requirements for a 1.5 GHz Spectrum Analyzer.Other ICs go as high as 6 or even 10 GHz and also start in the MHz-Range.
Farnell SA model 352C. Info req'd - Page 1
Forum section: electronics / testgear

author: sidspop
author_rank: Contributor
timestamp: April 18, 2017, 08:29:40 pm
content: Hi, just picked one of these up at a rally.Has anybody got any information, instruction manuals or suchlike> It all appears to be working, but it would be nice to know what I am doing with it.
Hameg HM8042 Curve Tracer connector type? - Page 1
Forum section: electronics / testgear

author: exor
author_rank: Regular Contributor
timestamp: April 13, 2017, 04:32:45 pm
content: Hi!I bought this second hand curve tracer some time ago but the special cable from unit X and Y outputs (number 3 in picture) to scope didn’t follow.I would like to test it and make the cable and wonder if anyone knows what is type of the connector or have the cable and are able to take a picture of the connectors? I already asked Hameg if they still have those cables and if not, what is connector type but they just answered that cable is not available anymore.Any additional info of the unit is also appreciated!

author: JoeO
author_rank: Frequent Contributor
timestamp: April 13, 2017, 06:55:22 pm
content: Multi Language Manual Here:http://www.sm5cbw.se/hameg/hm80/hm8042.htm

author: exor
author_rank: Regular Contributor
timestamp: April 13, 2017, 07:26:03 pm
content: Thanks! I forget to mention that I have that manual. Circuit diagram and pcb layouts are included but nothing about connector type.According the manual x/y outputs are available also from rear of the mainframe HM8001-2 with option HO801 (four BNC-connectors) but it is an option I don’t have. Maybe I should modify the mainframe.

author: exor
author_rank: Regular Contributor
timestamp: April 18, 2017, 09:16:10 am
content: One HM8042 popped up in eBay (http://www.ebay.de/itm/HAMEG-Modulsystem-Einschub-HM8042-/122451365175?hash=item1c82ab8d37:g:UqgAAOSwuspY9SyN) and now I have a picture of the connector.Even it doesn’t have to be 90 degree I think there is no commercial replacement available?

author: Marcus_S
author_rank: Contributor
timestamp: April 18, 2017, 06:49:07 pm
content: Is ist possible that this connector fits to something like an oscilloscope probe? Hameg used such connectors in older oscilloscopes as the output of the calibration generator.If - then an old probe or a piece of 5 mm tube (outer contact) and a 0,82 mm wire and some teflon or hotmelt or something like that for in between could do the job.Best regardsMarcus

author: exor
author_rank: Regular Contributor
timestamp: April 18, 2017, 07:22:05 pm
content: Good catch, now when you said it connector looks just like a probe without the hook piece!I will check and test within couple of days if some of my probes will do the trick. Thanks!Best regards,Jouni
HP 3312A - PWM? - Page 1
Forum section: electronics / testgear

author: perkabrod
author_rank: Contributor
timestamp: April 18, 2017, 10:16:12 am
content: Can the HP 3312A do PWM?I was thinking, in square wave mode, would the symmetry dial "work horizontally", adjusting duty cycle?And to get 0-5V I could do a little DC offset and change amplitude?Not sure if that's how it works though, looking to get one.

author: Aodhan145
author_rank: Frequent Contributor
timestamp: April 18, 2017, 11:12:22 am
content: Looks like you can check section 1-12, it mentions symmetry of wave form and a front panel control to change it.http://literature.cdn.keysight.com/litweb/pdf/03312-90004.pdf?id=734381

author: perkabrod
author_rank: Contributor
timestamp: April 18, 2017, 11:59:08 am
content: Thanks for the link to the manual!At page 16 and 18 in pdf file it mentions pulse/burst. Seems like it is possible.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: April 18, 2017, 08:52:12 pm
content: Yes, just checked it out on mine. 0-5v from about 15% (maybe 13%) to about 85% with the symmetry control.
Why would a working DMM read non-zero with no input connection? - Page 1
Forum section: electronics / testgear

author: chrisalbertson
author_rank: Newbie
timestamp: April 17, 2017, 06:55:00 pm
content: I am looking to buy a used DMM on eBay. Why do I see so many DMMS showing random volts on their displays with no leads plugging in. I'd expect a near zero volt reading. I think a DM has a 10M resister connecting the input to ground so it really should nearly zero.Are every one of these broken? Or is there some good reason for the non-zero display that I'm missing.I can understand if the unit were showing some micro-volts, that would be a cal or zero setting adjustment but I see some showing half a volt or more.

author: james_s
author_rank: Super Contributor
timestamp: April 17, 2017, 07:08:46 pm
content: DMMs have very high input impedance and with nothing connected they will pick up noise right out of the air, this is normal and expected behavior. If you install a shorting bar in the input jacks it should read 0.00 in most cases.

author: Jon.C
author_rank: Unknown
timestamp: April 17, 2017, 07:24:30 pm
content: In some models is crazy

author: Richard Crowley
author_rank: Super Contributor
timestamp: April 17, 2017, 07:40:53 pm
content: Quite to the contrary. If a DMM was reading exactly 0.00 volts on a low VOLTAGE range, I would suspect that it is broken. With the input "open-circuit" it should be expected to pick up nearby ambient electrical "noise". Of course, in a CURRENT range, or a high voltage range, we would expect essentially a zero reading.

author: serggio
author_rank: Regular Contributor
timestamp: April 17, 2017, 08:06:09 pm
content: DMMs do not use Ground, Volt measurement always differential measurement. You can consider it as referenced to "Ground" in DC mode.In lowest diapasons in are highly sensitive DMMs you will always see noises with open leads, even if reading stabilized after some time, and you'll move your hand close to leads terminals.That is Ok.If you have DDMs with lowest reading on display 0,00V - this DMMs should never be sensitive to environment noises, but if you have DMMs with lowest reading 0,0000 V and more or 0,000 mV, - it's ok if you able to see noise with open leads. Short-circuit your lead connected to DMM terminals and let you DMM stabilized at lowest reading, then use relative mode for measurement.
New firmware Keysight InfiniiVision 2000A&3000A - Page 1
Forum section: electronics / testgear

author: LA7SJA
author_rank: Regular Contributor
timestamp: April 16, 2017, 10:51:47 am
content: The new firmware is from 2017-03-29 and is version 2.42.http://www.keysight.com/main/software.jspx?ckey=2014479&lc=eng&cc=US&nid=-11143.0.00&id=2014479QuoteRelease Notes:http://www.keysight.com/upload/cmc_upload/All/Keysight_2000A_3000A_X_Series_Oscilloscope_Release_Notes_02_42.pdfJohan-Fredrik

author: gslick
author_rank: Frequent Contributor
timestamp: April 16, 2017, 02:17:33 pm
content: See also this thread from April 06, 2017:Free DVM & Training Signals for Keysight 2000X and 3000A oscilloscopeshttps://www.eevblog.com/forum/testgear/free-dvm-training-signals-for-keysight-2000x-and-3000a-oscilloscopes/
Tektronix's CRO's at Wyong Amateur Radio Field day - Page 1
Forum section: electronics / testgear

author: Harb
author_rank: Regular Contributor
timestamp: April 16, 2017, 08:22:43 am
content: Does anyone have any contact details for the bloke selling all the Tektronix Cro's in the traders area at the Wyong Amateur Radio Field day ?cheers
Breadboard with BNC connectors - Page 1
Forum section: electronics / testgear

author: Gripnook
author_rank: Contributor
timestamp: April 14, 2017, 08:05:33 pm
content: I'm looking to acquire a breadboard which has integrated Banana plugs and BNC connector female connectors to simplify my wiring. However, I couldn't find any relevant products when searching Mouser or Digikey. The only alternatives I've found are expensive trainer boards which also have power, signal generators and other peripherals built in. I'm looking for something simple with just some additional connectors that are already wired into the breadboard.Does anyone where I can find and purchase such a breadboard?

author: JXL
author_rank: Regular Contributor
timestamp: April 14, 2017, 08:37:46 pm
content: Add banana jacks and use BNC/banana adapter:

author: MikeLogix
author_rank: Contributor
timestamp: April 15, 2017, 02:22:48 am
content: You could just build BNC to BB adapters. See attached images. In one instance, I just soldered some stiff 22 AWG wire to a BNC, in the other case I cut a pre-made BB jumper wire with the Male pins and soldered to a BNC.

author: MikeLogix
author_rank: Contributor
timestamp: April 15, 2017, 02:26:40 am
content: One other way is to make your own trainer style BB. I made this one about twenty years ago. You could build something similar, best part is you can add the bells and whistles that you want.

author: Dubbie
author_rank: Unknown
timestamp: April 15, 2017, 06:30:22 am
content: I just use SMA through hole connectors. They fit into a 3x3 area on the breadboard with no modification and provide a nice close connection which reduces interference.

author: Gripnook
author_rank: Contributor
timestamp: April 15, 2017, 03:54:05 pm
content: Quote from: Dubbie on April 15, 2017, 06:30:22 amSeems like the best option assuming no commercial solutions are available.Something like this then?

author: Dubbie
author_rank: Unknown
timestamp: April 15, 2017, 06:19:05 pm
content: Well that is BNC. Not sure about the pin spacing on those. SMA is perfect 0.1". Then you can just use an SMA > BNC cable. But yes, that's the general idea.

author: kripton2035
author_rank: Super Contributor
timestamp: April 15, 2017, 06:44:43 pm
content: or make a small breadboard adapter for your BNC like this:available here :http://www.ebay.com/itm/BNC-female-breakout-board-PCB-pH-ORP-EC-chemistry-module-circuit-/152489535014?hash=item238115a626:g:-iAAAOSw5cNYiZ94
Iso-Tech IPS 2303DD Power Supply no output on master - Page 1
Forum section: electronics / testgear

author: dicky96
author_rank: Regular Contributor
timestamp: April 14, 2017, 04:56:58 pm
content: Hi GuysI have a Fault on my ISO-TECH IPS 2303DDThere is no output on the Master, the Slave works OK. When I vary the voltage on the Slave I can hear the relays clicking, but on the Master I don't. The V and A meters on the Master read 0.00I had a quick look, there are no fuses blown that I can see.It was working fine until I shorted the Master and set a current in CC mode to drive something (I think it was a laser diode) at low current, and the Volt/Amp readings went to zero and have never worked since.Does anyone have any schematics for this model? It is Dual output 30V 3A plus 5V 3AThanksRich

author: dicky96
author_rank: Regular Contributor
timestamp: April 15, 2017, 04:09:49 pm
content: This is now working again - there were two 20mm fuses on the bottom front edge of the main PCB which I could not see until I removed the pcb..... and they had blown.On the pcb they are marked T 0 .3A which I assume is 300mA. Actually they had been replaced before at some time (I got this second hand) with 400mA fuses. They were the 20mm type with a stiff wire soldered to both end caps and then direct to the pcb. Having tried to solder wires to a 315mA fuse (the nearest type I had) only to find one of the end caps come loose and the fuse go o/c due to heat from the iron, I decided to fit a couple of pcb mounting 20mm fuse holders instead. At least it will make the fuses easier to change in future should one go againRich
Old printers for test equipment - Page 1
Forum section: electronics / testgear

author: joeqsmith
author_rank: Super Contributor
timestamp: April 14, 2017, 06:45:21 pm
content: Most of my old test equipment can print to the old Epson LQ, MX dot or some support the HPLJ. I bought an Epson laser jet that emulated the HPLJ just for this reason and it has worked great. Before this I had a very early HP jet sort of but had to change the head out every few years. The Epson must be 20 years old now and failed to power up last week. Tore it down today and had two caps that had failed. Changed them out, checked the other caps, gave it a good cleaning and back in business. (added a picture of one of the caps)I'm curious now what people are using with their old test equipment? I had looked a while back and most of the printers would not run stand alone and the Centronics ports were not common..

author: james_s
author_rank: Super Contributor
timestamp: April 14, 2017, 07:00:54 pm
content: My scope and logic analyzer both support a printer, I've never tried connecting one directly though. I just capture the hardcopies to a floppy disk and transfer them to my PC, I can print from there if I want.

author: eugenenine
author_rank: Frequent Contributor
timestamp: April 14, 2017, 07:13:13 pm
content: Use screen or cutecom to capture the 'print' then HP2xx converts ithttps://www.gnu.org/software/hp2xx/
GAOTek Announces Ultra Portable and Versatile Digital Oscilloscope - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: April 14, 2017, 12:36:35 pm
content: http://www.prweb.com/releases/2017/04/prweb14207659.htm

author: Daruosha
author_rank: Regular Contributor
timestamp: April 14, 2017, 01:17:59 pm
content: Looks like a toy rather than a proper handheld tool. I wonder how much crap it's going to be, just by looking at the design of the layout and the screen type and information displayed on it.It's surly a joke. Isn't it?

author: nctnico
author_rank: Super Contributor
timestamp: April 14, 2017, 01:27:51 pm
content: Let's not kill new design ideas off the bat! The French company Metrix came up with this a long time ago:The GAOtek 'scope' seems to be more like a DMM with logging capabilities than a real oscilloscope though.

author: Fungus
author_rank: Super Contributor
timestamp: April 14, 2017, 02:42:15 pm
content: Total lack of tech specs?

author: kripton2035
author_rank: Super Contributor
timestamp: April 14, 2017, 02:48:23 pm
content: Technical SpecificationsDisplay 320 ´ 240 LCD Display area 3.07x 2.28 in(78 mm x 58mm)Backlight White or yellow Input impedance DMM 10M??Battery Built-in1600mAh Ni-Hi battery Auto power-off No action within 10minsLow Battery indicator Charging time More than 8hoursWorking time Approx. 6 hours Memory DMM 400groups data and DSO 40 waveform recordWork condition 0~+104 F(0°C~+40°C);<75%RH Storage condition 14~ 140 F(-10°C ~ +60°C); <90%RHDimension 7.87x 5.31x 2.047 in(200mm ´ 135 mm ´52mm) weight Approx 2.204 lbs(1000g) (Net weight)Operate height 0~ 6561.68 foot(0~2000m) Adaptor power 110V~250V?12V/1A, protection- switch powerAnalog bandwidth DC ~ 50MHz, probe: X10; DC~6MHz, probe X1 (3db bandwidth?sine wave response)Max sampling rate 200Msps Vertical resolution 8 bitsChannel 1 couple DC/ACInput impedance 1M?//20pF Div vertical ±4 div horizontal 10 divVertical sensitivity range 20mV/div ~ 50V/div 1-2-5 exchanging step Time base 10ns/div ~ 1s/div 1-2.5-5 switchVertical amplitude accuracy ±(5%+ 0.1div) Time base accuracy ±(0.01% + 0.1div)Auto-Zero calibrating Yes Measuring mode Normal, Video, SingleTrigger level ± 3.8 div (every step interval 0.04div) Single slop of selection Rising edge/ Falling edgeTrigger condition ± 3.8div (every step interval 0.04div) Auto setting Auto setting time base and amplitudeCursor measuring dV, dt, Auto measuring Vp-p, +Vp,-Vp,f,,TAuto measuring accuracy ±(5%+ 0.1div) Waveform (sinx)/x

author: Fungus
author_rank: Super Contributor
timestamp: April 14, 2017, 02:53:44 pm
content: I guess it all depends on price. There's already cheapo handheld stuff out there though, eg. DSO quad.

author: pascal_sweden
author_rank: Super Contributor
timestamp: April 14, 2017, 03:51:45 pm
content: POJ - Piece of Junk
http://www.phatflags.com/?page_id=natures-viagra&category=pills - Page 1
Forum section: electronics / testgear

author: RonaldHog
author_rank: Newbie
timestamp: April 14, 2017, 12:43:59 pm
content: http://www.phatflags.com/?page_id=prednisone-60-mg-daily&category=where

author: videobruce
author_rank: Frequent Contributor
timestamp: April 14, 2017, 01:54:08 pm
content: Spam!!!
Global Oscilloscope Market 2017-2021 – New Study Released - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: April 14, 2017, 11:27:18 am
content: TechNavio’s analysts forecast the global oscilloscope market to grow at a CAGR of 5.67% during the period 2017-2021.More details about the Market Report from TechNavio can be found here:http://www.fastmr.com/prod/1272531_global_oscilloscope_2017_2021.aspxOrbis Research has a similar Market Report that includes more vendors:http://www.orbisresearch.com/reports/index/2017-2022-global-top-countries-oscilloscope-market-reportAnd here is another report from QY Research Group:http://www.qyresearchgroup.com/market-analysis/global-oscilloscope-market-2017-industry-trends-sales-supply.htmlI have requested a sample chapter from these reports, and will post it when I receive it.Insights from these Market Reports could result in a nice YouTube video!
Fluke 123 Scopemeter Power Connector Type? - Page 1
Forum section: electronics / testgear

author: MatteoX
author_rank: Regular Contributor
timestamp: April 12, 2017, 11:49:01 pm
content: I just got a very good deal on a Fluke 123 Scopemeter. I charged the NiCd batteries on an external power supply and everything seems to be working.It does not have power supply. Does anyone knows what type of connector is used for the power supply? Or if someone could measure the lenght and diameter of the metal barrel. I believe, the diameter is about 5mm (5.4mm) but I don't know the length, the hole on the meter looks quite deep. (total depth about 22mm, inner barrel depth about 10, so I guess the barel lenght should be >= 10mm if the plastic part can pass through the outer hole).On the power supply data sheet the connector is specified as DIN45323, 5mm OD.On more question, the original power supply is for 15V. Would it be possible to use 12V supply? I have plenty of those.The battery is almost dead, so I will replace it with NiMh (or maybe later with Li Ion as was described in a recent thread).

author: BFX
author_rank: Frequent Contributor
timestamp: April 13, 2017, 01:05:03 pm
content: Hi,connector isA: outer metal diameter 5mm , length 5.5mminner hole diameter 2mmB: plastic after metal part is diameter 6.3mm , length 6.3mmC: next plastic part is diameter 8.4 , length 10mm15V/300mA!!! plus is on outer contact

author: MatteoX
author_rank: Regular Contributor
timestamp: April 13, 2017, 03:25:21 pm
content: Thanks BFX for the dimensions and photographs. Now I know what I have to look for.Do you have idea if the meter would work with 12V power supply?

author: noidea
author_rank: Unknown
timestamp: April 13, 2017, 04:19:59 pm
content: See this thread. it may helphttps://www.eevblog.com/forum/repair/fluke-scopemeter-12v-auxiliar-power-input/

author: carl_lab
author_rank: Frequent Contributor
timestamp: April 13, 2017, 06:18:09 pm
content: Be aware that you need protection class 2 (double insulated) power supply if you want to use the scopemeter for mains voltage measurements!https://en.wikipedia.org/wiki/Appliance_classes#Class_II

author: iainwhite
author_rank: Unknown
timestamp: April 13, 2017, 06:32:54 pm
content: Service Manual is here >http://assets.fluke.com/manuals/123_124_smeng0000.pdfCheck out Page 2-10 :

author: MatteoX
author_rank: Regular Contributor
timestamp: April 13, 2017, 07:58:08 pm
content: Quote from: carl_lab on April 13, 2017, 06:18:09 pmYes I am aware that I need class 2 power supply. Thanks for posting this, because someone less experienced might miss that.I will be using the charger just for charging and occasional low-voltage work. For any "serious" voltage I prefer to work on battery if possible (depending on the battery charge).

author: MatteoX
author_rank: Regular Contributor
timestamp: April 13, 2017, 08:02:20 pm
content: Quote from: iainwhite on April 13, 2017, 06:32:54 pmThanks, I have downloaded the manual but I missed that page. I checked the schematics to see power supply circuit.
Wavetek 395 resistor - Page 1
Forum section: electronics / testgear

author: Monolith
author_rank: Contributor
timestamp: April 11, 2017, 01:19:32 pm
content: I recently purchased a faulty Wavetek 395 Arb generator and found some time to investigate the fault. Device is responding well on front panel for all settings, but the output is heavily distorted. After removing the cover it is perfectly explainable why: Resistor R163 has been heavily toasted. Looks like the previous owner used this generator for inrush current measurements...Can somebody identify this resistor R163? It's located near the output (see pic). Thanks in advance for this!Kerry D. Wong made already a very nice review of this device last year:http://www.kerrywong.com/2016/06/26/wavetek-395-arbitrary-waveform-generator-teardown/Unfortunately this resistor is not identifiable too in his pictures..regardsMono

author: Monolith
author_rank: Contributor
timestamp: April 11, 2017, 01:31:07 pm
content: for comparison: output section of Kerry D. Wong's device:

author: cvanc
author_rank: Frequent Contributor
timestamp: April 11, 2017, 06:08:57 pm
content: Don't know the box but wanted to point out R161 & R162 both look like they took some stress too... good luck with your fix.

author: casinada
author_rank: Frequent Contributor
timestamp: April 12, 2017, 02:01:50 am
content: Just pulled mine out of the closetMeasurements didn't make much sense. Probably some components are affecting them.R160 = 83.5 ohm (can't read the marking)R159 = 83.5 ohm (301R) is 301 ohmsR163 = 83.5 ohm (150R) is 150 ohmsR161 = R162 = 75 ohmsFrom your picture it looks like R160 = 301 ohmsThey are all 0.1% resistorshttp://www.vishay.com/docs/31027/cmfmil.pdfThey are Dale (now Vishay) Mil Spec resistors RN typeI hope this helps.TTI wave generators look like the Waveteks. I think at one point they purchased them. FLuke has also some Wavetek looking function generators.

author: Monolith
author_rank: Contributor
timestamp: April 13, 2017, 07:31:24 am
content: @casinada: That's great! Thanks for looking! I did a temporary replacement with a 1% 150 Ohm resistor but still get the distorted waveform. I get an voltage offset and on sine wave mode i get only the upper half of the sine. So there is a good chance, that an active component is faulty too. Probing around i found many spots, where a correct waveform is present, so there is hope ...
HP/Agilent/Keysight 3631A Power Supply Mains Connection - Page 1
Forum section: electronics / testgear

author: SparkFly
author_rank: Regular Contributor
timestamp: April 12, 2017, 10:26:21 pm
content: Dear All,I've had to take apart a 3631a supply, and foolishly my teardown pictures aren't clear enough for me to be 100% sure as to which jumpers the mains input wires go. I've consulted the manual, and looked online at others pictures, but they're just as cryptic. Would anyone be able to tell me whether the mains connections (ie the blue and brown from the mains direct) goes to J12 (with the back of the supply facing you, the left jumper) or J13 (the right). The other pair of blue/brown will go into the other jumper.Many thanks for any help you can give.SF
HP8720C Network Analyser Option 010,001 installation procedure? - Page 1
Forum section: electronics / testgear

author: sanwal209
author_rank: Regular Contributor
timestamp: April 12, 2017, 09:06:22 am
content: Hi,I have bought HP8720C and i have keyword for option 001, 010. Installation of these software is just a software procedure and i am not able to find one for this particular machine not even in service manual. There are procedures for HP8720ES but not for HP8720C. Please help me out in this matter.Thanks
SIGLENT EasyWave - Waveform Parameters are Reseting - Page 1
Forum section: electronics / testgear

author: Duyunu
author_rank: Newbie
timestamp: April 14, 2017, 05:53:33 pm
content: Hello, I have setup Siglent EasyWave without an issue after installing the required software located in the help file. Does anyone have any idea why when creating a waveform with the standard waveform editor, the following occurs:Offset goes back to 0PWidth goes back to 50%I have been using Offsets and PWidths less than 50%, but it always resets. Screenshot of what I am trying to do is below.Thank you,Matthew

author: tautech
author_rank: Super Contributor
timestamp: April 14, 2017, 07:59:47 pm
content: Welcome to the forum.Can I ask which instrument you're using, has it the latest FW installed and which version Easywave ?On the shipped CD some of the programs may have been updated for better functionality so you'd be best to check you have latest versions:http://siglentamerica.com/gjjrj.aspx?id=14&page=1

author: Duyunu
author_rank: Newbie
timestamp: April 15, 2017, 01:25:49 am
content: Sure you can, and thank you for asking:SDG8101.08.01.12R2SDG800 V100R008B01D01P12R2.ADSEasyWave 1.1.1.34I have no trouble loading the waveforms to the SDG810, My concern that is that EasyWave reverts the values back to defaults when I edit them. I don't know who to communicate this to.Thank you, Matthew

author: tautech
author_rank: Super Contributor
timestamp: April 15, 2017, 04:16:32 am
content: Quote from: Duyunu on April 15, 2017, 01:25:49 amHere's fine.Reported to engineers to follow up on.Siglent have this thread too for bringing stuff to their attention:https://www.eevblog.com/forum/testgear/siglent-technical-support-join-in-eevblog/And you can contact US Siglent here:https://www.eevblog.com/forum/testgear/new-siglent-support-email-address/

author: Duyunu
author_rank: Newbie
timestamp: April 15, 2017, 04:05:42 pm
content: Thank you, I'll keep an eye out for an update while reporting the bug.
CAT-III rated insulated scope probes and Fluke bananas - Page 1
Forum section: electronics / testgear

author: bitbanger
author_rank: Regular Contributor
timestamp: April 11, 2017, 03:55:05 am
content: Hi folks -I finally bit the bullet and upgraded my aging Fluke 92 Scopemeter to a new (to me) '125. I need a rugged scope for diagnosing three phase VFDs, rotary encoders, bus links, etc.Anyway the 125 was the best I could afford, and it's perfect for my needs, but it uses these goofy Fluke shielded banana connections. I have a set of the STL120 insulated leads, good for 600V CAT-3 but they're 1:1 and limited to 12MHz. Fluke sells a nice set, VPS41 (that require the use of a banana to bnc adaptor) but about $150 a pop. They are part of the retail package but weren't included in mine. Wondering if anyone out there in the industrial realm has seen any alternatives? 50+MHz CAT-III+ 600V? By looks alone it appears they may be rebranded Pomonas? Anyway I've paid more for probes and certainly wouldn't sacrifice safety/quality for price, but thought I would ask while the wallet cools off a bit.Second thing - anyone have any thoughts on where to source free-hanging/inline connectors to mate to the Flukes shielded bananas? I'd like to make a few test adaptors/breakout cables and it would be nice to be able to connect directly (without dealing with the BNC adaptors).Cheers,Jamie

author: noidea
author_rank: Unknown
timestamp: April 11, 2017, 05:10:00 am
content: I don't know who OEM's the STL120 leads/ probes but the VPS41's look very similar to the VPS210 10:1 probes I have on a have a Fluke 196C.The OEM for those is actually Multi Contact / Staubli they are the Isoprobe IV series.HTH

author: bitbanger
author_rank: Regular Contributor
timestamp: April 12, 2017, 12:54:15 am
content: Very helpful, thanks - another eBay keyword to keep an eye on!

author: noidea
author_rank: Unknown
timestamp: April 12, 2017, 04:42:08 am
content: I'm nots sure where you are located but in Australia even at RS components the Multi Contact ones are less than half the price of the Fluke branded ones and tend to have more accessories with them.
Revisiting the Keithley 7510 - Page 1
Forum section: electronics / testgear

author: bson
author_rank: Unknown
timestamp: April 12, 2017, 02:01:34 am
content: I'm in the market for another DMM (jeez), and given Keysight never responded to my inquiry about the MEM upgrade for the 34465A (I eventually gave up and just bought the digitizer and memory options since I needed them at the time) - and now with service centers which apparently think recommending against the use of their own products is a viable solution, I'm looking at the Keithley 7510. I was going to order the 34470A with both options, but looking at the price it's only about $800 less than the Keithley (both as quoted), and the Keithley on paper is a significantly more capable instrument. More memory, faster acquisition, better stability, lower noise floor, and a bunch of useful measurement tools. (The 2450 SMU also looks very interesting, especially the ability to measure I-V response or act as a precision current sink.) But specs is one thing, actual use another and the 7510 has been plagued with tons of firmware problems. Is this all water under the bridge at this point? The 34465A, if anything, is a rock solid performer. (Apart from ACAL having messed up my ACV calibration.) How is the 7510 in use? Aye or naye on buying one?
Agilent 3632a PS problem - UREG at certain voltages and current - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: April 12, 2017, 12:53:07 am
content: Hello,I do not have a electronic load. What I do have is an instrument that runs on 11-16 volts and draws ~2 amps. When I use my Agilent 3632a above 14 volt in the 15 volt range, it de-regulates. It is okay if I go to 16 volts or above. I changed both pass FETs and the rectifier bridge. On the big main cap in the 15 volt range there is only 14.4volts so I can see why it deregulates around 14.2 volts.12 volts AC feeds the bridge so shouldn't 20volts come out (12 *1.4 = 20)? When it switches to the 30 volt range the SCRs in the transformer circuit turn on and the cap voltage goes to about 42 volts. The power supply regulated fine on the 30v range as far as I can tell. The problem is on the 15v/7amp range.There are two primary SCR circuits. One driven by "range" and the other by "tab". "Tab" seem to trigger at same time as the high range.I'm scratching my head over this one. It should be simple. Can anyone tell me what cap voltage they have when on the 15volt range? When should the "Tab" controlled SCRs come on?I'm tempted to jumper the "tab" controlled SCR circuit so it's on all the time.Maybe a true calibration could fix this but I don't have an electronic load. I would like one but I don't expect to be working on many power supplies.Thanks kindly,Dave
Soltek 8K43 Oscillograph Manual - Page 1
Forum section: electronics / testgear

author: CatalinaWOW
author_rank: Super Contributor
timestamp: April 11, 2017, 04:54:35 pm
content: I bought a Soltek 8K43 Oscillograph in a lot of surplus electronics. I know that oscillographs are slightly more outdated than dinosaurs, but they played a big role in my early career and wouldn't mind having this one functioning. This one must have been one of the last of the breed since it is microprocessor controlled and has dot matrix annotations on the output. The user interface is obscure, but I have figured out some of the simple stuff like setting the clock/calendar, setting chart speed and loading paper, but have been stumped beyond that, continually getting error messages in the display.Does anyone have a user manual for this or other similar Soltek product that might get me over the hump?If not, it is not a total loss. This makes the largest, heaviest, coolest looking digital clock on the planet.
Has anyone got one of these? - Page 1
Forum section: electronics / testgear

author: SNGLinks
author_rank: Regular Contributor
timestamp: April 11, 2017, 09:12:14 am
content: http://www.banggood.com/MR9270S-4-20mA-Signal-Generator-Calibration-Current-Voltage-PT100-Thermocouple-Pressure-Transmitter-p-1103449.html?utmid=1589

author: filssavi
author_rank: Frequent Contributor
timestamp: April 11, 2017, 09:20:04 am
content: nope but FWIW either banggod has started serving suspicious swf files or there is something phishy going on with the link

author: SNGLinks
author_rank: Regular Contributor
timestamp: April 11, 2017, 10:13:57 am
content: A better link?http://www.ebay.com/itm/MR9270S-4-20mA-HART-signal-generator-calibration-Current-voltage-thermocouple-/142221509246

author: anman
author_rank: Contributor
timestamp: April 11, 2017, 10:58:23 am
content: I am very satisfied with the operation of this device (MR9270C). Boughthere

author: SNGLinks
author_rank: Regular Contributor
timestamp: April 11, 2017, 11:15:17 am
content: Quote from: anman on April 11, 2017, 10:58:23 amThanks!
Mastech MS8260E Digital Multimeter for measuring the inductance of DC Motor - Page 1
Forum section: electronics / testgear

author: fishandchips
author_rank: Regular Contributor
timestamp: April 10, 2017, 12:48:24 pm
content: Hello, on Amazon, some reviews of LCR meters mentioned that the readings are wrong. How about this meter? Is it sufficiently good to be used to measure the inductance of a 12V DC motor?

author: dcbrown73
author_rank: Regular Contributor
timestamp: April 10, 2017, 06:23:05 pm
content: I just ordered one of these off wish.com for $27. Much cheaper than Amazon or other locations I've found by at least around $5.I figured at $27 (+$10 shipping), it was worth the risk of it being a POS. I couldn't find any bad reviews of it and a few decent ones.

author: fishandchips
author_rank: Regular Contributor
timestamp: April 11, 2017, 02:07:33 am
content: When will you receive it? Please let us know how good or bad it is. Meanwhile, any other recommended multimeter to measure the inductance of DC motor?
IFR COM-120B NVRAM backup - Page 1
Forum section: electronics / testgear

author: razvanm
author_rank: Contributor
timestamp: April 02, 2017, 06:37:55 pm
content: Hi guys,I own an IFR COM-120B service monitor and from what I've heard, it has the DS1286 NVRAM chip with internal battery which will go out and you lose your options. Haven't turned on mine since 2014 when it was working fine but I plan on using it in a few weeks. My questions are :1. Does any of you know if (and how) can the contents of the DS1286 be backed up if there is still enough battery voltage left on the battery?2. If wiring an external lithium battery to pins 21/25 will maintain the data even if the internal battery goes out?Thank you.Razvan

author: KA3YAN
author_rank: Contributor
timestamp: April 10, 2017, 07:48:27 pm
content: There's a really good post over on the Batwing Labs forum:http://batboard.batlabs.com/viewtopic.php?f=42&t=111370andhttp://batboard.batlabs.com/viewtopic.php?f=42&t=80947They are moderated by an Aeroflex engineer.

author: TheSteve
author_rank: Unknown
timestamp: April 10, 2017, 08:13:16 pm
content: for batlabs.com
Trace average calc on SA or FFT - Page 1
Forum section: electronics / testgear

author: electr_peter
author_rank: Unknown
timestamp: April 08, 2017, 08:22:42 pm
content: Some DSOs have a function for trace averaging which is implemented as arithmetic average of several acquisitions. Spectrum power display on SA or FFT also can be displaced as an average of several acquisitions. As spectrum is mostly displayed in dBm units (logarithm of power), "trace average" can mean arithmetic value of dBm units or arithmetic average of actual power. The latter is the case in my understanding. However, manuals mention "trace display average", which is not 100% clear.How is "trace averaging" implemented on SA or FFT? Is it arithmetic average of dBm units or arithmetic average of actual power?For example, say one trace on SA is at -10 dBm, other is at -50 dBm level. Then arithmetic average of two traces is -30dBm while actual power average is -13 dBm.Code:display average = { -10dBm + -50dBm } / 2 = -30dBmpower average = 10 * log10[ { 10^(-10 dBm/10) + 10^(-50 dBm/10) } / 2] ~ -13dBm

author: nctnico
author_rank: Super Contributor
timestamp: April 08, 2017, 08:40:20 pm
content: In my Advantest R3477 I can select between power average (RMS), video average and voltage averag.

author: Bud
author_rank: Super Contributor
timestamp: April 08, 2017, 08:47:33 pm
content: To me trace average implies whatever trace you have on the display gets averaged. Not the data the trace was derived from.

author: electr_peter
author_rank: Unknown
timestamp: April 09, 2017, 07:38:02 pm
content: Thanks for the input.From responses it seems that the terms "trace average" or "average" with respect to spectrum measurements can have several definitions (mostly meaning real power average of some sort) in SAs or DSOs. Manual of specific instrumentation should be consulted carefully if in doubt.

author: w2aew
author_rank: Super Contributor
timestamp: April 10, 2017, 01:19:35 pm
content: Note that averaging the log power values is mathematically incorrect, but is included in most spectrum analyzers for historical purposes (it was there on older analyzers, and a lot of specifications for component and system testing were written around using this).

author: bson
author_rank: Unknown
timestamp: April 10, 2017, 06:41:13 pm
content: Trace averaging is nice to reduce visible noise and get a better defined trace while eyeballing. But obviously, linear voltage averaging is more useful for measurement of e.g. a peak value even if displayed in log.
TAS series Oscilloscopes by Tektronix - Page 1
Forum section: electronics / testgear

author: buck converter
author_rank: Regular Contributor
timestamp: April 04, 2017, 01:14:00 am
content: What do people have against the TAS series scopes? I nabbed one for 80 bucks shipped in the US, fully working with probes and power cord,2ch 60 MHz. It is my first scope. It may have menus, but don't all modern scopes?eBay auction: #http://www.ebay.com/itm/122326623500?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITNo storage, but it does have the auto-set button that works well.Why were these scopes frowned on?In 2017 are they a better choice for beginners?

author: edavid
author_rank: Super Contributor
timestamp: April 04, 2017, 02:57:46 am
content: That link should behttp://www.ebay.com/itm/122326623500Anyway, I think it's mostly the UI that people hate, but did the schematics ever turn up?

author: scopeman
author_rank: Frequent Contributor
timestamp: April 10, 2017, 01:37:36 am
content: Hi Buck Converter,These are fully analog scopes and none of the ones in the line had storage of any kind.I have a TAS485. 200MHz IIRC. The nice thing about these scopes is the 4 channel models have full range vertical attenuators on all channels, which the 24XX series did not. However the performance of the 24XX series in terms of display quality and other performance factors are better. They were touted as low cost scopes at the time. I am sure that the TAS series will serve you well as it is still better than any new analog scopes that are on the market today.Here is what I can find on this series:http://w140.com/tekwiki/wiki/TAS465One of the manuals has schematics. I would imagine that all of the models in this series are similar.Another manual link:http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%20TAS%20475,%20485%20Instruction.pdfSam

author: ebclr
author_rank: Super Contributor
timestamp: April 10, 2017, 02:37:38 am
content: You can use this device to be tested using the TAS series oscilscoperhttp://www.ebay.com/itm/RARE-VINTAGE-NIFTY-NIRONA-GERMAN-TOY-WIND-UP-PHONOGRAPH-GRAMOPHONE-RECORD-PLAYER-/182524106417?hash=item2a7f48d6b1:g:ocIAAOSwuxFY3GNV

author: David Hess
author_rank: Super Contributor
timestamp: April 10, 2017, 03:23:01 am
content: My only real complaint about the TAS series of oscilloscopes is their lack of complete documentation.

author: james_s
author_rank: Super Contributor
timestamp: April 10, 2017, 05:13:24 am
content: I don't think they're very well known, they don't seem to be common. Analog scopes in general are not in vogue, they're becoming more of a niche item all the time. Even the CRT based DSOs are pretty cheap these days, I've bought several TDS 300 and 400 series scopes, most with minor issues, one ended up working perfectly, it was just dirty, anyway I think only one of them cost me over $100. People pay a lot more for stuff like the TDS220 which is less capable, the only advantage it has is smaller physical size.
Keithley 2015THD - 10G Ohms Input Resistance - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: April 08, 2017, 07:53:22 pm
content: Hi All,Is there a trick to getting this set other than selecting the 10V or less ranges? I'm trying to track down a problem with a 3403C on its DC 10mV range.The circuit tracks into a voltage divider that should halve the value (it's basically two ~9.5M ohm resistors) - I was checking the resistors and confirming voltages by unsoldering the divider and tracking the 10mV DC through.With my DM3058 set to 10G input resistance, I see exactly what I expect, 10mV through the circuit to the unsoldered end of the ~9.5M resistor.Setting the 2015THD to 100mV range should make the input resistance greater than 10G and yet when I get to the end of the resistor I'm actually seeing ~2.4mV (which actually implies my input resistance is somewhere in the range of 25M ohms).Have I missed another option on the meter somewhere that can switch the input resistance?Thanks,TonyG

author: z01z
author_rank: Regular Contributor
timestamp: April 10, 2017, 09:14:13 am
content: AFAIK there's no trick, it's automatic.Your meter might have excessive bias current. It was discussed in several topics how it can be measured and fixed (likehereandhere, for example).

author: TiN
author_rank: Super Contributor
timestamp: April 10, 2017, 10:35:02 am
content: There is no trick or switching impedance function on Keithley's (2000,2015,2001/2002, likely 2010 too). It should be 10+G on 0.1-1-10V ranges, unless meter is faulty. Make sure autoranging is disabled.

author: Tony_G
author_rank: Super Contributor
timestamp: April 10, 2017, 05:39:24 pm
content: Thanks z01z & TiN.I'll take a look at the bias current and see if that was the issue (I did have the meter manual set to the range).TonyG
mV DC on Fluke 101? - Page 1
Forum section: electronics / testgear

author: dimkasta
author_rank: Regular Contributor
timestamp: April 07, 2017, 12:40:23 am
content: Does anyone know of a way to hack or mod the small fluke to give mV on DC?

author: joeqsmith
author_rank: Super Contributor
timestamp: April 07, 2017, 02:11:50 am
content: There is no need to hack or modify it. Just make a programmable amplifier that you can use between the meter and what ever you are trying to measure. The 101 is one of the most robust meters I have ran. No sense in taking away the one thing is has going for it.

author: dimkasta
author_rank: Regular Contributor
timestamp: April 07, 2017, 07:32:13 am
content: ThanksI have other dmms I can use for that. I was just wondering if there is something like the trick on 12e to get freq and duty cycle.Sent from my HUAWEI NXT-L29 using Tapatalk

author: saturation
author_rank: Super Contributor
timestamp: April 09, 2017, 08:40:17 pm
content: I use the 101 a lot. It reads to 5mVdc to its spec accurately without mods, that is 0.005Vdc on the lowest scale. Below that is undefined.