hybridfree/eevblog-posts huggingface dataset:
Agilent/Keysight DSO/MSO 3XXX VGA/Lan cards - Page 1
Forum section: electronics / testgear

author: Kintekobo
author_rank: Regular Contributor
timestamp: August 19, 2015, 07:38:22 pm
content: I seem to remember seeing a post that suggested that someone here was selling these VGA/LAN cards. Not sure if they were 'home-brew' or surplus stock or some such. If so are they still on sale and if so what is the price?

author: Mark
author_rank: Frequent Contributor
timestamp: August 19, 2015, 08:10:25 pm
content: I am posting here to also register my interest.
72-8355 TENMA Power Supply Noise - Page 1
Forum section: electronics / testgear

author: LIGHTSSOUT
author_rank: Newbie
timestamp: August 14, 2015, 07:51:39 am
content: HiCan anyone give me advise on Power supply noise.I brought TENMA 72-8355 and when I probe my circuit board with an analogue discovery on the output of a MOSFET I have noise on the PWM signal.See attached picture.The noise also goes away when connected to my PC's USBFirst time using an Oscilloscope so please be niceThanks in advance for any help

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 14, 2015, 08:01:32 am
content: Is the power supply not working as it should? "noise" on switching signals or PWMs are rarely a problem. And why are you probing a MOSFET?

author: LIGHTSSOUT
author_rank: Newbie
timestamp: August 14, 2015, 08:13:55 am
content: Quote from: TheAmmoniacal on August 14, 2015, 08:01:32 amJust learning, the Mosfet is needed in the circuit as the Micro I am using can not source enough current to light a multiplexed LED display.I am using a PSOC4 BLE from cypress on there development kit.All other parts are OK and are Square

author: LIGHTSSOUT
author_rank: Newbie
timestamp: August 20, 2015, 09:50:30 am
content: Just an update.Found out that the Pins are/have to be left floating on the multiplexed display.So nothing was wrong.
General DMM550 for 50 USD at Home Depot today - Page 1
Forum section: electronics / testgear

author: GeekPriest
author_rank: Contributor
timestamp: August 19, 2015, 02:02:19 pm
content: Well, I'm greatly tempted by this $50 (USD) General DMM550 (link below) today. The question is whether it's a typical cheap junk meter that Dave ridicules or something more in line with its $75 list price?Link:http://www.homedepot.com/p/General-Tools-Rugged-True-RMS-CAT-III-1000-Volt-Multimeter-with-NCV-Detector-and-K-Thermocouple-Probe-DMM550/205748236Any idea who makes this one? I found a manual for its sibling DMM570, but it doesn't include information on changing the fuses. Thus, there's no way to assess that aspect of it.From the page:18 functions, 48 rangesMeasures AC/DC-Voltage, AC/DC current, resistance, capacitance, frequency and duty cycleAlso measures temperature from -58° to 1112°F using “K” type thermocouple probeChecks continuity and diode integrityTrue RMS measurementsDesigned to meet CAT III 1000-Volt, CAT IV 600-Volt safety standardAuto or manual ranging110VAC non-contact voltage (NCV) detectorAC voltage measurement range/accuracy: 0 to 1000V/±1.5% (typical)DC voltage measurement range/accuracy: 0 to 1000V/±0.5% (typical)AC/DC current measurement range/accuracy: 0 to 10A/±1.5% (typical)Resistance measurement range/accuracy: 0 to 40M?/±0.8% (typical)Frequency measurement range/accuracy: 10Hz to 40 MHz/±1.5% of readingCapacitance measurement range/accuracy: 0 to 40mF/±3% of reading (typical)Temperature measurement range/accuracy: 32° to 1832°F/±1% of readingBacklit 3-1/2 digit (4,000 count) dual readout LCD with 40-segment analog bar graphHold, max, min, reel (zero) display optionsIncludes cloth pouch with belt loop, double-insulated test leads with screw-on alligator clips, “K” type thermocouple probe and plug adaptor, 3-year limited warranty, user’s manual

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: August 19, 2015, 03:06:22 pm
content: In style and layout it looks like a Mastech MS8251C. I haven't compared the specs though.

author: Melt-O-Tronic
author_rank: Frequent Contributor
timestamp: August 19, 2015, 03:15:20 pm
content: My gut reaction is that it's ordinary Harbor Freight grade Chinese junk. I only say that because everything I've ever seen branded "General" from Home Depot fits that description.

author: GeekPriest
author_rank: Contributor
timestamp: August 19, 2015, 03:18:59 pm
content: Yep. Definitely the Mastech (Sinometer) MS8251C.JUNK.

author: Muttley Snickers
author_rank: Unknown
timestamp: August 19, 2015, 03:28:43 pm
content: Mastech MS8251B...(Lo-z)90 day return policy from your link, I would grab one to fill in a rainy day.....TEquipment has them for around $55 USD so they cant be all that bad surely,

author: commie
author_rank: Frequent Contributor
timestamp: August 19, 2015, 04:04:01 pm
content: A pile of stinking crap, anything below 6000 count and 'no name brand' forget it

author: GeekPriest
author_rank: Contributor
timestamp: August 19, 2015, 04:10:39 pm
content: Fifty bucks is fifty bucks. Why spend it on a meter that's available for thirty-five (as a Mastech)? But then, why buy a Mastech?
BK Precision 1500 100 MHZ Oscilloscope - Page 1
Forum section: electronics / testgear

author: xeonon
author_rank: Contributor
timestamp: August 17, 2015, 08:27:57 pm
content: Hey guys, long time lurker of the forums, and watcher of Dave lol. So I've got a nice looking BK Oscilloscope from Ebay on the way, and as you do, I was looking for the manual online. No such luck. In fact I can't even find anything about the 1500. Anyone have any tips for finding a service manual for the old analog scopes? I know the scope is going to need a calibration, but without the the manual, I'm just going to be randomly turning pots, and that never ends well.

author: DC912
author_rank: Contributor
timestamp: August 18, 2015, 05:16:42 am
content: bkmanuals.com has an instruction manual and a parts list/schematic listed for sale.http://www.bkmanuals.com/1401-1500.htmI've never bought from the site, but might be worth emailing to ask if there are sevice instructions in either. Dave

author: tautech
author_rank: Super Contributor
timestamp: August 18, 2015, 05:53:11 am
content: Quote from: DC912 on August 18, 2015, 05:16:42 amI think that link is for the purchase of hard copy manuals.Try this one:http://www.bkprecision.com/support/request.html

author: xeonon
author_rank: Contributor
timestamp: August 18, 2015, 06:44:02 pm
content: Quote from: tautech on August 18, 2015, 05:53:11 amThanks!They were able to send me the calibration materials, which is honestly all I need at the moment. I may grab the printed manual from bkmanuals.com Seems like the BK scopes are harder to get the manuals etc. for. Hitachi ones are all over the internet.

author: tautech
author_rank: Super Contributor
timestamp: August 18, 2015, 07:37:55 pm
content: Quote from: xeonon on August 18, 2015, 06:44:02 pmIn pdf or paper?If BK will send Owners/Users and Service, get them all. It adds value to your CRO in the long term if you have all the manuals.

author: xeonon
author_rank: Contributor
timestamp: August 18, 2015, 08:37:44 pm
content: PDF. Just the calibration section as that was all I could get. They directed me to bkmanuals.com for the manual etc. Quick response from them too. At least considering I sent the e-mail about 4am and got a reply by 12.
Keysight U1733C LCR Meter And more! 10% savings on Newegg - Page 1
Forum section: electronics / testgear

author: jpenn
author_rank: Contributor
timestamp: August 18, 2015, 05:48:19 pm
content: Just a heads up to anyone in the USA who might be interested. I went looking for a good price on a Keysight U1733C LCR meter and I came across a promo from Newegg. The meter is sold by a company named Zoro and along with free shipping, if you put in the promo codeZOROSALEyou will get a $42.95 discount off of the order. Ended up costing me 386.54 complete. Promo ends Aug. 22.I double checked and found that anything sold by Zoro on the Newegg site is free shipping and 10% off listed price with the ZOROSALE promo code till Aug. 22.John P.
Simpson 77-380 Wavemeter - Page 1
Forum section: electronics / testgear

author: Bud
author_rank: Super Contributor
timestamp: August 22, 2015, 02:33:21 am
content: I am guilty I forgot about this jewel I bought about 10 years ago at a hamfest. Time to show it to the world.Solid metal cast case, reasonably heavy, the dial feels tight and nice, no wiggle or backslash, beautiful piece of engineering. Not your Dad's meter, your Dad Dad's meter!

author: Bud
author_rank: Super Contributor
timestamp: August 22, 2015, 02:37:52 am
content: This is amazing that being designed for Ham radio, the meter was actually calibrated - note the calibration coil cards.See what the slogan says below Simson's logo in the last attached picture? I am going to validate that claim

author: Bud
author_rank: Super Contributor
timestamp: August 22, 2015, 02:42:06 am
content: Reserved for User Manual pictures.EDIT: PDF download link:Simpson77.pdf
PSU current calibration: DMM DCI vs current shunt? - Page 1
Forum section: electronics / testgear

author: bson
author_rank: Unknown
timestamp: August 16, 2015, 10:28:17 pm
content: I'm looking at the calibration instructions for a DC power supply (HP/Agilent 66312A). The manual instructs the use of a 0.1ohm 15A low-TCR current shunt and measuring it with a DVM for its high-range current calibration measurement. Now, the supply can only output5A2A (Imax), so I'm thinking I should be able to measure this with a modern DMM in DCI mode on the 10A input, perhaps with a 0.1R 2-5W resistor in series. With a quality low or compensated TCR, miniaturized current shunt built into any modern bench DMM, is there any reason to still use the external shunt and not just make DCI measurements with a ballpark comparable load? Isn't it enough to just add one inline? Apart from I don't have a 15A shunt, and a quick check of a 0.1R 5W 1% Dale resistor I have on hand yielded atrociously poor TCR...

author: deadlylover
author_rank: Frequent Contributor
timestamp: August 17, 2015, 02:44:11 am
content: The 66312A is a 0.05% class instrument, and just as a rule of thumb you need something 4 times or preferably 10 times more accurate for calibration.The accuracies of current ranges for bench meters are actually quite poor compared to their voltage or resistance ranges, and 2A is pretty high current for a bench meter.For example (1 year specs), the popular 34401A's 3A range performs at 0.14%, and the brand new 34470A is worse at 0.22%. The $4000 Keithley 7510's 3A range is specced to 0.044%...impressive but still nowhere near the performance required to calibrate the 66312A.Quality shunts are the way to go for accurate high current measurements.

author: Vgkid
author_rank: Super Contributor
timestamp: August 17, 2015, 04:36:26 am
content: If you power supply had less current, it would be better to actually measure the (shunt)resistor and calculate the current flowing through that.Since using the 34401A as an example as its low ohms range is much more accurate than its current specs for a year. What I did was use my 3456A in 4 wire offset Ohms mode to take an bunch of readings and average out the resultant value. That was constant to 4 decimal places with the 5th changing. This was all in the same temp span. Them used that value and the rel(cancel out the init thermal emf's) mode to calculate the resultant current using the voltage on the shunt.

author: bson
author_rank: Unknown
timestamp: August 17, 2015, 05:09:16 am
content: I watched the resistance climb about 1.2% over 10 degrees C, so that's on the order of 0.12% or 1200ppm/C...I suppose I could measure R at various temps and fit that to a curve R(T). Then when I make the voltage measurement also measure the temp... hmm. R increases with T so it should eventually converge on a temperature for a given voltage, so I'd need to just wait for the temp to stabilize and use it and the voltage to determine the current.Or I could just put the ammeter in series.
What shall I call it?  Voltage & Current Multiplexer? - Page 1
Forum section: electronics / testgear

author: wagon
author_rank: Frequent Contributor
timestamp: August 15, 2015, 12:50:46 pm
content: Hello!I'm building a box that consists of 7 4pole relays and a bucket load of terminals that has 6 inputs (and outputs) but also has a voltmeter and ammeter outputs. It's for a ' Rapid Chloride Permeability Test' machine. The machine is PC controlled, but the operator doesn't always trust the readings he's getting, so he need to 'manually' check the voltage and current on a pair of multimeters.So, if you select channel 1, the current output goes through the ammeter and the voltage on the cell is read on the voltmeter.Or channel 2, etc. When a channel is being directed through the external meters it goes straight in, then straight out.Would I call this box I'm building a multiplexer?

author: TheElectricChicken
author_rank: Frequent Contributor
timestamp: August 15, 2015, 02:18:22 pm
content: I'm thinking it's still just a meter, or power meter to be specific.

author: Richard Crowley
author_rank: Super Contributor
timestamp: August 15, 2015, 02:30:48 pm
content: Well, National Instruments just calls it a "switch". They come in many form-factors.http://sine.ni.com/np/app/main/p/bot/no/ap/mi/lang/en/pg/1/sn/n25:device,n21:12,n17:mi/

author: TiN
author_rank: Super Contributor
timestamp: August 15, 2015, 03:02:48 pm
content: Switch or mux array. There are many versions available from T&M vendors, such as cheapKeithley 7001with cards, and sometimes there are mux/switch cards as options for some bench DMMs as well. Many various flavors of these things exist, for low-currents, high-currents, high-voltages, thermocouples, RF, etc...

author: wagon
author_rank: Frequent Contributor
timestamp: August 15, 2015, 03:52:15 pm
content: So, '6 port voltmeter / ammeter switch' sounds fair?

author: Richard Crowley
author_rank: Super Contributor
timestamp: August 15, 2015, 04:22:16 pm
content: Quote from: wagon on August 15, 2015, 03:52:15 pmDepends on what you are going for here. Why is the name of the thing so important?

author: wagon
author_rank: Frequent Contributor
timestamp: August 16, 2015, 12:09:27 am
content: Quote from: Richard Crowley on August 15, 2015, 04:22:16 pmIt's not really, but I need to call it something.

author: VintageNut
author_rank: Frequent Contributor
timestamp: August 16, 2015, 01:33:47 am
content: In general, a multiplexer or MUX for short, has multiple outputs and one input. The outputs are usually scanned one at a time.A matrix has multiple inputs and multiple outputs set up as rows and columns. Any row can connect to any column.

author: wagon
author_rank: Frequent Contributor
timestamp: August 16, 2015, 11:37:49 am
content: Thank you for all of your thoughtful replies. I went with '6 channel voltmeter/ammeter switch'.
Help to identify 10V reference chip in AOIP MN5121 DMM (1983 vintage) - Page 1
Forum section: electronics / testgear

author: sorenkir
author_rank: Regular Contributor
timestamp: August 16, 2015, 02:46:11 pm
content: Hi,I could not find any data about the MP5532, 10V reference of this DMM, see attached picture.According to the schematic, pinout is :2 - +15V power supply4 - GND5 - TRIM6 - +10V outputThanks,Michel.

author: papou_79
author_rank: Newbie
timestamp: August 16, 2015, 03:54:25 pm
content: Hi sorenkir,Manufacturer of MP5532 was ( in 1983) MICRO POWER SYSTEMS INC.You can find the schematic of AOIP MN5121 to this URL:http://www.radiomuseum.org/r/aoip_multipreci_mn_5121.htmlRegards.papou_79

author: sorenkir
author_rank: Regular Contributor
timestamp: August 19, 2015, 09:52:15 am
content: Merci papou_79 !Never heard of this chip maker before. Seems to have disappeared.Did not find any info or datasheet about MP5532Michel.
Trend plot Fluke  123/124/125 scopemeter - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: August 14, 2015, 12:54:55 pm
content: I have been trying to do a trend plot of fuel pressure vs (400Hz PWM duty cycle) of a inlet metering valve using the fluke 125 scope-meter.I discovered the fluke trend plot does not respond to waveforms with frequencies as low or lower than 400Hz.Is this a firmware bug?Please see the link below to see what I am trying to achieve:http://www.tiepie-automotive.com/en/Measurement_examples/CombinationMeasurements/Fuel_Pressure_Sensor_And_Metering_Valvehttps://www.picoauto.com/library/training/utilising-maths-channels-to-view-an-inlet-metering-valve-imv-duty-cycleThanks R_G_B

author: synapsis
author_rank: Regular Contributor
timestamp: August 14, 2015, 02:27:41 pm
content: I just tested my 125 (software V03.04) and it will plot a trend down to about 22hz without issues.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: August 14, 2015, 11:59:21 pm
content: thanks synapsis I have managed to figure it out. You can get it to work below 25Hz ...first you have to set and match the time base settings in scope mode first before it will trend plot. If the time base is too short. Then when you select trend plot nothing will happen.Not sure if this a firmware bug?It seems odd that you should have to set the correct time base in scope before trend plot will start to plot.R_G_B
HP 5328A sick, wong frequency out after warm up - Page 1
Forum section: electronics / testgear

author: lincoln
author_rank: Regular Contributor
timestamp: August 14, 2015, 07:46:45 pm
content: Hello,Well, I pick up a 5328A universal counter as a "second banana", My main counter is often busy with longer term measurements.After fixing the power switch It seed to work well, until it gets warm. I am using an external 10 MHz reference. As the time base. I am measuring frequency (10 MHz +- 100 ppb) in to channel A with 1Hz resolution (1 second gate time) the readings good from a cold start but after 10 ~20 minuets they start to bounce around +4 ~ + 55Khz. When this is happening, I change function to "check" display reads 10 MHz bang on. Also set the input module to check and reads 100MHz (option 40 installed) bang on.I have also run the "marker output" to a o-scope and the threshold for the counter is set well. (giving a nice 50ish% square wave out. ) Reading the marker out to a second counter also read the correct frequency. (both counters are using the same external timebase)Tonight i will have a change to go through the service manuals, But I though I would float it by the group to see if anyone had a suggestion.Link

author: Towger
author_rank: Super Contributor
timestamp: August 14, 2015, 09:11:06 pm
content: Can of freezer spray and a hot air gun.
Help Needed to Archive TE Manuals - Page 1
Forum section: electronics / testgear

author: jcreedon
author_rank: Newbie
timestamp: August 16, 2015, 01:39:23 am
content: I'm posting this here to get it a little more visibility. A lot of us here have been the beneficiaries of scanned manuals, and Jason Scott, who is an avid digital archivist has stumbled upon a collection of 25 thousand manuals that are about to be disposed of. He is in need of hands to help him sort through duplicates, pack, and move these manuals to storage while he figures out digitizing them. This is all happening near Baltimore, MD, so if any readers here are near enough to help on Monday, it would be much appreciated.Details on hisblog(viahackaday).Photos

author: tautech
author_rank: Super Contributor
timestamp: August 16, 2015, 01:46:00 am
content: Let's link these 2 threads together:https://www.eevblog.com/forum/chat/rescue-mission-25-000-manuals-baltimore/

author: jcreedon
author_rank: Newbie
timestamp: August 16, 2015, 02:01:47 am
content: Quote from: tautech on August 16, 2015, 01:46:00 amWow, didn't see that. Sorry.

author: tautech
author_rank: Super Contributor
timestamp: August 16, 2015, 02:05:22 am
content: Quote from: jcreedon on August 16, 2015, 02:01:47 amDon't you be sorry, I am because I'm too far away to be of any help.
Grundig TG5 - Page 1
Forum section: electronics / testgear

author: Nisei
author_rank: Regular Contributor
timestamp: August 17, 2015, 01:32:44 am
content: I came acrossthis thingon a flea market yesterday and bought it because I love Nixie tubes.It was only 12.50 and I figured that even the tubes alone would be worth the price.I plugged it in when I got home and it seems to work but I have no idea what these things are used for.Is this still of any use nowadays or is it vintage technology?Found a manualhere.

author: xrunner
author_rank: Super Contributor
timestamp: August 17, 2015, 01:37:49 am
content: Quote from: Nisei on August 17, 2015, 01:32:44 amWOW! That's cool. To answer your question - sure - if it works it's both vintage and useful. But I think it's very, very cool.

author: Nisei
author_rank: Regular Contributor
timestamp: August 17, 2015, 08:55:46 am
content: Thanks for responding.So what exactly are these used for? I can see a use for measuring frequency but in what situations do you need it to generate a certain frequency?

author: Miles Teg
author_rank: Regular Contributor
timestamp: August 17, 2015, 09:12:52 am
content: Seems like a simple low frequency generator.This is maybe the most used device on electornic bench after Power supply, multimeter and before oscilloscope.Use really often to check how your circuit behave depending of level or frequency of input.Use it a lot for audio before getting a dedicated audio analyzer commanded by PC.
HP / Agilent 6645A Power supply question - Page 1
Forum section: electronics / testgear

author: bills
author_rank: Frequent Contributor
timestamp: August 14, 2015, 03:54:49 am
content: I have a chance to buy one for under $100.00 us. but its broken.it passes it's self test and the voltage control works.The shaft for the current control is broken, The control is a hp/optical encoder pn#0960-0912, can these be found?Is it worth taking a chance on buying this?I watched the video that dave made on the 6641 (667) and I am wondering if this model can be modified.any opinions?thank in advancebill

author: picburner
author_rank: Frequent Contributor
timestamp: August 14, 2015, 06:16:23 am
content: You can easily find the encoder, for example here:http://www.ebay.com/itm/Agilent-HP-0960-0912-RPG-Rotary-Encoder-/300815927900?hash=item460a06ca5c

author: bills
author_rank: Frequent Contributor
timestamp: August 14, 2015, 06:22:57 am
content: Yes I can replace that. I think I will buy it.thanksbill

author: Jwalling
author_rank: Unknown
timestamp: August 14, 2015, 12:30:52 pm
content: Quote from: picburner on August 14, 2015, 06:16:23 amBe careful. Older HP units will NOT work with that encoder! The one in that Ebay link is for newer 65XX 66XX power supplies. I don't know when the change-over was made.Jay

author: picburner
author_rank: Frequent Contributor
timestamp: August 14, 2015, 07:26:17 pm
content: Jay, you are definitely right.For a 6645A series 3539A-00561 the right encoder is p/n 0960-0822 that should be Avago HRPG-AS32#59C.My research was based only on the incorrect p/n 0960-0912.

author: rx8pilot
author_rank: Super Contributor
timestamp: August 14, 2015, 08:31:54 pm
content: I love these supplies, hope you can get it. Surely the encoder repair will not be too difficult.

author: bills
author_rank: Frequent Contributor
timestamp: August 14, 2015, 08:34:54 pm
content: No I missed it, logged in 2 min late. It went for $99.99

author: Jwalling
author_rank: Unknown
timestamp: August 15, 2015, 10:41:05 am
content: Quote from: picburner on August 14, 2015, 07:26:17 pmYup. Those are hard to find as well. Keysight hasn't had any stock for years, and they were always breaking off!Jay
BK Precision 9801 - AC Power Source - Page 1
Forum section: electronics / testgear

author: mercoz
author_rank: Newbie
timestamp: May 06, 2015, 09:23:59 pm
content: I was just looking around, and I saw that BK Precision has a new AC Power Source, the 9801. I was thinking of getting one. Do you know of any other AC power sources that are compact like that? Most of the other ones I found are wide rack mount type, and I like the compact benchtop form factor.

author: Bob S
author_rank: Contributor
timestamp: August 14, 2015, 01:18:41 am
content: Did you pick this unit up and if so your thoughts?
Explain it to me like I'm 12: Differences between turbine and diaphragm hot air - Page 1
Forum section: electronics / testgear

author: JGAN
author_rank: Contributor
timestamp: August 12, 2015, 04:24:00 am
content: I'm having a lot of trouble understanding the differences between a turbine and diaphragm hot air station. I know that there is something in pressure differences between the two, and a turbine can put out a higher cfm than a diaphragm hot air station, but I don't know how the two correlate with each other.Basically, how do these two systems work? What are the pros and cons of each? Why would I even need such a high cfm from a turbine station?

author: RobertHolcombe
author_rank: Frequent Contributor
timestamp: August 12, 2015, 04:44:35 am
content: https://www.eevblog.com/forum/testgear/hot-air-pump-diaphragm-vs-squirrel-fan/

author: JGAN
author_rank: Contributor
timestamp: August 12, 2015, 04:47:20 am
content: Yes I have read that many times now. Not very helpful, it seems to contradict itself and doesn't do a good job of explaining what the differences are between the two.

author: pickle9000
author_rank: Super Contributor
timestamp: August 12, 2015, 05:28:31 am
content: Are you interested in function or what are the downsides of each?From a functional standpoint (I have both) I find my diaphragm type is more delicately adjustable (airflow) at the low end. That can be useful in tight areas. Having said that it's easy enough to protect components with tape (like masking or foil).A good statement would be that both work well, diaphragm is noisier and slightly more controllable on the low end, but has a large air line attached so harder to manipulate. I don't tend to favor one more than the the other I just grab the closest one and get at it.

author: JGAN
author_rank: Contributor
timestamp: August 13, 2015, 05:26:25 pm
content: I'm really just looking to see which setup will fit what I do best. Anything, good or bad, helps a lot.
new oscilloscope probes - Page 1
Forum section: electronics / testgear

author: edmundopt
author_rank: Regular Contributor
timestamp: August 13, 2015, 01:26:04 pm
content: helloI am searching for at least 150mhz probes, and after some search, I found two that I can get very easly(mouser/digikey):The TPI P200B (200Mhz 10:1)http://www.digikey.pt/product-detail/en/P200B/290-1002-ND/268014The Pomona 6069A (250Mhz 10:1)http://www.digikey.pt/product-detail/en/6069A/501-1011-ND/603321The Pomona 5806A (20/200Mhz 1:1 10:1)http://www.digikey.pt/product-detail/en/5806A/501-1008-ND/603318The TPI looks really cheap, considering that its 40€ instead of the 81.36 for the pomona, the question is, does anyone knows this probe ?, is is any good ?Another questions is, switchable probes are not really my favorit, but because its from pomona I might consider them , anyone with these ?

author: nctnico
author_rank: Super Contributor
timestamp: August 13, 2015, 01:51:46 pm
content: I don't like the Pomonas. The probe is way too thick so it will be difficult to use.Did you look at Testec? I would get switchable probes though. If you want to measure a low level signal it is handy to switch them to 1:1 instead of 1:10.

author: edmundopt
author_rank: Regular Contributor
timestamp: August 13, 2015, 03:02:58 pm
content: I went to look for it, and I foundhttp://www.testec.de/tastkoepfe_mf_250mhz0.0.html?&L=1the product would be the TT-MF 312 probes (1:1 1:10 250Mhz)they also look large, do you use this ? what is the durability on the 1:1 1:10 switch ? does it feel like a secure switching position ?

author: nctnico
author_rank: Super Contributor
timestamp: August 13, 2015, 03:24:51 pm
content: I have a bunch of Testec TT-LF 312 1:1/1:10 switchable 150MHz probes and they are not as thick as they look on the picture. The metal end is slightly less than 5mm. These can be bought as single pieces (with a lot of accessories) or economy packs with 2 probes and just a spring-hook, earth wire and probe adjust tool.

author: georges80
author_rank: Frequent Contributor
timestamp: August 13, 2015, 04:25:06 pm
content: If available to you in your country, the Probe Master scope probes are quite good, nice and slim and come with a variety of probe adapters for various probing challenges.i.e.http://www.probemaster.com/index.php?cPath=1cheers,george.

author: joeqsmith
author_rank: Super Contributor
timestamp: August 13, 2015, 05:01:50 pm
content: I bought some very low cost ($9 US) Hantek PP150 10X probes that were offered as 100MHz. These were VERY well made and the actual BW was much much higher. These came two in a bag. I suspect if you buy them now, they may still have the same performance as the ones I tested.This is the link to my review on them if interested.
Searching for Service Manual for Philips PM 2422_A_ DMM - Page 1
Forum section: electronics / testgear

author: reinhardz
author_rank: Contributor
timestamp: August 09, 2015, 09:45:28 pm
content: Hi,In December 2013 someone here searched for this manual; another member of this forum posted a link to it. Unfortunately, this link doesn't work any more.The manual provided by Elektrotanya is, again unfortunately, not complete: parts of the schematic are missing. So I now ask by myself for help finding this manual.Many thanks in advance, best regardsreinhardz

author: tautech
author_rank: Super Contributor
timestamp: August 10, 2015, 08:52:52 am
content: Have you tried all the links in the thread in the Repair board?https://www.eevblog.com/forum/repair/

author: reinhardz
author_rank: Contributor
timestamp: August 10, 2015, 11:36:55 am
content: Quote from: tautech on August 10, 2015, 08:52:52 amA forum-search for "PM 2422A" wasn't successful as well as intensively reading the great teardown of that DMM by schwarz-brot.But maybe I can't see the forest for the trees...Best regardsreinhardz

author: tautech
author_rank: Super Contributor
timestamp: August 10, 2015, 07:38:32 pm
content: A google search found this:http://www.apite.com/apitewww/modelo.php?modelosin=PM2422A&marca=260

author: reinhardz
author_rank: Contributor
timestamp: August 12, 2015, 06:26:14 pm
content: Quote from: tautech on August 10, 2015, 07:38:32 pmHallo tautech,thank you very much for the link. I clicked on the link and was delighted:http://www.bilder-hochladen.net/files/big/12b4-h1-47ec.jpgSo, I clicked on "Download":http://www.bilder-hochladen.net/files/big/12b4-gy-d69f.jpgOops, no file. Okay, they want my e-mail address. That's an acceptable price for the manual. I filled in my e-mail address, my name, and company name. Then I clicked on "Send":http://www.bilder-hochladen.net/files/big/12b4-h2-d8aa.jpgOops again :-(! What about free download? One has even to pay and register? Next click:http://www.bilder-hochladen.net/files/big/12b4-h0-c079.jpgAdmitted, 3 US$ is not that much for the manual. But I am angry about the dubious business practices. That is why I refrain to acquire the manual of this source.Is there really no alternative?Best regardsreinhardz
TEquipment.Net EEVBlog Code - Page 1
Forum section: electronics / testgear

author: Attorney
author_rank: Regular Contributor
timestamp: August 09, 2015, 07:57:26 pm
content: Just tried using the EEVBlog code for a purchase and "no-go." Assuming the promotion code is still running, can someone please PM me the latest code? Thanks.-Paul

author: dadler
author_rank: Unknown
timestamp: August 09, 2015, 08:22:26 pm
content: Just tried it, code has not changed.With MSO1104Z in my cart:Discount:($59.82)

author: Attorney
author_rank: Regular Contributor
timestamp: August 09, 2015, 08:30:11 pm
content: Thanks for confirmation that the promo is still running but my prior code (ending in 6) is not working. So, I still need a PM with the code.Thanks. Paul

author: dadler
author_rank: Unknown
timestamp: August 09, 2015, 08:39:07 pm
content: PM sent.

author: Attorney
author_rank: Regular Contributor
timestamp: August 09, 2015, 09:06:56 pm
content: It turns out the code IS the same. Only, I copied and pasted from another post. When manually typing it in, all worked well. Sorry for the trouble. Thanks, dadler.-Paul

author: verbatone
author_rank: Contributor
timestamp: August 11, 2015, 07:12:04 pm
content: Could someone be kind enough to send me the code as well? Thanks!

author: Fat
author_rank: Regular Contributor
timestamp: August 12, 2015, 12:31:46 am
content: Just an FYI for everyone, if you catch them during regular business hours and go to chat mode with one of the reps they will let you know the code and how to apply it.Fat.
Function generators  - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 11, 2015, 06:54:06 pm
content: I am in the market for a new function generator, I have neroided narrowed to the fallowing three Rigol DG1022U, Siglent 1025 or HP 33120A used. What would be the pros and cons to each generator.ThanksAztlan

author: dadler
author_rank: Unknown
timestamp: August 11, 2015, 06:57:31 pm
content: Out of those 3, I would go with the Siglent.Better specs, color screen. The Rigol is Ok, the HP is ancient and has low specs.

author: LaurentR
author_rank: Frequent Contributor
timestamp: August 11, 2015, 09:00:51 pm
content: The DG1022U is fine for what it does and could fit the bill fine.However, it's definitely not one of these "incredible values" Rigol has like the DS1054Z (or the DP832). It's more of an ok, somewhat old design that delivers the goods, but not in any particularly remarkable way.Laurent

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 11, 2015, 09:11:37 pm
content: Quote from: LaurentR on August 11, 2015, 09:00:51 pmWhat would you recommend for under 400 USA dallors

author: commie
author_rank: Frequent Contributor
timestamp: August 11, 2015, 09:39:46 pm
content: Quote from: Aztlanpz on August 11, 2015, 09:11:37 pmSave some more $$$ and widen your choice.

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 11, 2015, 09:59:00 pm
content: What's a target budget to work to and what are good models?

author: dadler
author_rank: Unknown
timestamp: August 11, 2015, 10:46:44 pm
content: I think the Siglent you suggested is good for the money.

author: LaurentR
author_rank: Frequent Contributor
timestamp: August 11, 2015, 11:34:44 pm
content: One upside of the Rigol is that it's been around for long enough that you can occasionally find good used ones on EBay for a fair price.I just sold my DG1022 (not U) for $270.
14 x 1Ghz Channels for your scope ;) - Page 1
Forum section: electronics / testgear

author: TSL
author_rank: Regular Contributor
timestamp: August 09, 2015, 06:47:38 am
content: Browsing eBay I found this gem...http://www.ebay.com/itm/Agilent-HP-54300A-PROBE-MULTIPLEXER-/281766672036?Pity there's no shipping to Oz, I'd be tempted to buy it just to play withregardsTim

author: kripton2035
author_rank: Super Contributor
timestamp: August 09, 2015, 07:40:05 am
content: ask the seller : he seems ok to send with fedex or usps, so may be to any countrybut the shipping charges may be higher than the instrument itself... this thing seems quite heavy ?

author: electr_peter
author_rank: Unknown
timestamp: August 09, 2015, 08:14:27 am
content: This instrument is even better than 14 x 1 GHz - it has 16 channels in fact.

author: dom0
author_rank: Super Contributor
timestamp: August 09, 2015, 08:57:11 am
content: I wonder if they actually managed to fill the full-width system 2 case, or if it's half-empty...

author: pascal_sweden
author_rank: Super Contributor
timestamp: August 11, 2015, 09:02:24 pm
content: It's like a jukebox for oscilloscopesNo need to manually turn the LP, no need to manually change the BNC cable

author: nctnico
author_rank: Super Contributor
timestamp: August 11, 2015, 09:17:15 pm
content: Be geeky and turn this into a source selector for your audio/video gear

author: free_electron
author_rank: Super Contributor
timestamp: August 11, 2015, 09:27:31 pm
content: Quote from: nctnico on August 11, 2015, 09:17:15 pmbut only use oxygen free copper, cryogenically treated with counterclockwise atoms ... ( or use coathangers, they have been proven to sound superior to anything else out there )
HP 8481D power sensor - questions/repair - Page 1
Forum section: electronics / testgear

author: kuba
author_rank: Newbie
timestamp: August 14, 2015, 12:03:03 pm
content: Hello,Recently I bought a 8481D power sensor for parts. I have received it today and carried out some tests - it simply does not measure the power so I downloaded the service manual and checked if the diode module is OK - to my surprise the electronics are all in good shape and working!Finally I have dismantled the connector and it turned out that there is a contact element missing. In the service manual it is named "bellows" - it connects the diode assy pcb with the golden pin B in the connector.Does anyone have a damaged 8481D sesnor for sale or wants to sell only the bulkhead assembly ? Any pictures of the "bellows" element - I don't even know how it looks
Test clips for 0.8mm pitch TQFP - Page 1
Forum section: electronics / testgear

author: wreeve
author_rank: Unknown
timestamp: August 11, 2015, 11:02:52 am
content: I’ve got the Agilent 0.65mm and 0.5mm wedge clips which work perfectly on their respective pitches. Anything above 0.8mm is also fine as the standard clips fit! I am having difficulty finding a clip on 0.8mm pitch solution. I've got a 44pin PIC to debug!Can anyone recommend some fine pitch clips or even a TQFP clip on break out solution?
LeCroy WaveSurfer 3000 Promo - Page 1
Forum section: electronics / testgear

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 10, 2015, 06:08:27 pm
content: Seems Keysight isn't the only one giving out free options:http://teledynelecroy.com/europe/promotions/promotions.aspxUntil Sept 30th all WaveSurfer 3000 scopes come with all the options enabled, including the Arbitrary Waveform Generator.

author: nctnico
author_rank: Super Contributor
timestamp: August 10, 2015, 06:52:32 pm
content: This would be interesting if they also pitched in the MSO option.

author: NoItAint
author_rank: Contributor
timestamp: August 11, 2015, 05:33:24 am
content: Interesting but couldn't find the same promotion on the US site?

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 11, 2015, 05:37:55 am
content: Quote from: nctnico on August 10, 2015, 06:52:32 pmMSO would be nice. But on the other side, even Keysight's promo doesn't include the MSO option for the DSOX3kT.Quote from: NoItAint on August 11, 2015, 05:33:24 amI think it's EU only, but I'm sure if you ask LeCroy USA I'm sure they'd match that (they often included all options for free when asked even before this promo).
Polrad / Rohde & Schwarz SMS - Page 1
Forum section: electronics / testgear

author: Stonewerk
author_rank: Contributor
timestamp: August 11, 2015, 12:53:32 am
content: Does anyone here have a Polarad SMS or R&S SMS RF Signal Generator (notthe SMS 2)?If so, have you used the IEEE/GPIB interface on the instrument for control?
HP/Agilent 6641A PS Vout terminal loose - is this by design? - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: August 10, 2015, 06:49:23 pm
content: Just got a used HP/Agilent 6641A power supply and the three screw output terminal on the back seems to be very loose (to forward/backward pressure). It's as if it is only attached by the three pins that connect the three output terminals to the main board without any kind of support brackets on the sides or back. It's either that or someone pulled hard enough on the +/-/Gnd output terminals to damage the support brackets.For anyone with this supply or others in the 664xA series, just how loose should the three screw Vout strip (V+,V-,Gnd) be? Does it normally have some sort of supporting mechanism or bracket other than the three prongs that connect it to the main board?I can easily bend it forward and back and have to be very careful when tightening/loosening the screws on the terminal.
Owon SDS8202 firmware upgrade - Page 1
Forum section: electronics / testgear

author: Simon
author_rank: Unknown
timestamp: June 14, 2015, 12:21:25 pm
content: Is it possible to update the firmware of the owon SDS8202 and hopefully add the menu item for the VGA output ? The VGA pcb footprint is there so if i put one in and could enable it in firmware voila

author: crispus
author_rank: Regular Contributor
timestamp: August 10, 2015, 12:48:20 pm
content: I was able to update my OWON using this pagehttp://www.owon.com.hk/service_s.asp?SortID_1=3I have already the VGA/LAN option so I can't say how you can enable it.
Hantek DSO5102P : firmware update ??? - Page 1
Forum section: electronics / testgear

author: mushroom
author_rank: Regular Contributor
timestamp: April 26, 2015, 01:35:44 am
content: Despite Dave's video, I recently got a Hantek DSO5102P. I first did a system backup, and then used it a few weeks.My DSO fw is 3.40.0(140925.0), hw version : 1000xffff8108 ; I think that "140925" means 2014-09-25Today, I decided to update the firmware.I searched for files and found two versions :Hantek Onedrive : 3.40.0(140208.0)Hantek website : 3.40.0(140806.0)Firmware updates are not up to date ! Why the hell do they release obsolete firmwares ?To see how fw updates work, I had a try with 3.40.0(140806.0) fw (older)... It seems to work (displays version correctly), but shows an error screen at power on. 3 options : F1-reboot, F2-recover system, and F3-update the recover partition.F1-reboot : reboots without any error message, and seems to work ; but the error reappears when cycling power.F2-recover system : replaced the "update" (older 3.40.0(140806.0) ) with the original one (most recent 3.40.0(140925.0), installed when I received the DSO ), and problem was fixed.I did'nt try F3-update the recover partition.Did Hantek release a true fw update ? What fw versions do you have with your DSO5000P ?

author: edmundopt
author_rank: Regular Contributor
timestamp: August 09, 2015, 09:26:28 pm
content: hi, can you send me that firmware , upload it to zippyshare or somethingmyne is runing an older version, and I can't find your version to download.
TRIO Test & Measurement is Moving - Page 1
Forum section: electronics / testgear

author: TrioTest
author_rank: Contributor
timestamp: August 10, 2015, 04:55:57 am
content: TRIO Test and Measurementis moving offices in Sydney. Now we are located in Castle Hill but we need to be closer to Dave so we are moving to the same suburb as Dave, Baulkham Hills. In fact we are moving to the same business park!!Our move is scheduled for 3rd week in September and we are starting a stock clear-out of items in the Castle Hill store. We'd rather ship it to customers than move it.As an example, the WENS 540 is now $545 AUD +gst if you are in Australia. In USD it's about $395 USD at an FX of AUD/USD= 0.725 This is actually lower cost than it seems to be on Alibaba.https://www.eevblog.com/forum/testgear/wens-540-handheld-10mhz-oscilloscope-and-debug-meter/That's a good price we believe. We have only 7 of them at this price. It's here for on line shoppers. Visitors to our Sydney store are also welcome.http://www.triotest.com.au/shop/handheld/3125-wens-540-10mhz-automotive-oscilloscope-and-debug-meter.htmlIf you are outside Australia or NZ we can supply but email us onsales@triotest.com.auto inquire if we ship to your location.Some of the clearance items are here:http://www.triotest.com.au/shop/303-clearance-itemsex-demo is here:http://www.triotest.com.au/shop/371-bargains-ex-demoThere'll be more stock added over the next few weeks. If you see anything else on our website you can always ask if it is in Sydney and even though it might not be listed as a clearance item, if it's in Sydney, we'll work-out a deal for you. If you register on our website for the news letter we'll be sending out a list in a week or so from today.Register here:https://www.triotest.com.au/shop/authentication?back=my-accountContact us on 1300 853 407 or sales@triotest.com.auCheers!
DS100z CSV - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: August 10, 2015, 02:26:13 am
content: For the life of me I can not fined the program that will allow me save a wave to a CSV file with more then 1200 points from my Rigol DS1054Z.ThanksAztlan
Tek PS2520 aka GW Instek PPT3615 schematics? - Page 1
Forum section: electronics / testgear

author: siggi
author_rank: Regular Contributor
timestamp: June 25, 2015, 02:52:48 pm
content: Hey y'all,the other day a broken Tek PS2520 follwed me home from eBay. It's now busy blowing fuses on what appears to be the 5V supply to the front panel.I'm not having any luck finding a service manual, though it looks like perhaps this supply is OEM by GWInstek. The PPT3615 looks identical in specs and appearance at first glance.I still find no SM for it, save perhaps for this <http://www.ebay.com/itm/281710841827>.Does anyone here have a copy to share, or pointers to where I might find this. I tried emailing GW Instek, but so far no reply.Thanks,Siggi

author: siggi
author_rank: Regular Contributor
timestamp: June 27, 2015, 07:50:22 pm
content: Anyone, anyone, Bueller?Sent from my iPad using Tapatalk

author: siggi
author_rank: Regular Contributor
timestamp: August 09, 2015, 05:10:52 pm
content: I'm just about done with this guy - I just need to sort a current/voltage readback problem on one of the channels.It's a pretty old-fashioned design (still found no schematic). Each channel has an ingoing pair of clock/data lines with two strobes. This feeds to two sets of shift registers one of which is 16 bits, the other is 8, that can be individually strobed to latch the incoming data.The back channel is a single bit that's multiplexed 8 ways.There's a single multiplexed DAC on each channel. It feeds out to at least 3 sample and holds, one each for OVP, voltage and current setting. Additionally it has to feed to comparators for current/voltage readback, though I haven't traced that circuitry.The tally so far is:- A 74LS244 on the digital shorted the 5V rail.- This took out the fuse and the diode bridge for same.- A CD4093 shorted from 5V to one input on one of the channels.- Some opto couplers were tired and no longer met the required current transfer ratio to make logic tresholds on the far side, so changed them all.- All three AD7541As were gonsky.After all of this, I'm now getting outputs on all three channels, and the dang thing seems to be in spec for accuracy on current limit and voltage on all channels.Incidentally I found this video, where there's a DAC that failed in a similar mode as two did in mine. It appears the AD7541A can fail by shorting the switch FETs gate to source, which causes the current from the inputs to get shunted straight to the output.My unit is pretty clean, no sign of mechanical damage or trauma of any kind. It seems strange to me that I have various failures across 4 galvanically isolated domains.I'm wondering what sort of situation or event would cause that?
HP 3435A - No display - Page 1
Forum section: electronics / testgear

author: mbear2k
author_rank: Regular Contributor
timestamp: August 07, 2015, 02:42:04 pm
content: Hello all - I picked up a very clean HP 3435A multimeter for the cost of a cup of coffee (Starbucks). This does not have the battery option, and fundamental power checks are okay - but there is no display. No function LED's or display of any kind.What I've checked:+7v and -7v supply lines okay - have not checked ripple or current draw yet-2v okayVS to U11, U12, U13 okayRibbon cable to display card tested okayBefore I go much further, has anyone had a issue similar and are there common causes?Thanks,Mark

author: mbear2k
author_rank: Regular Contributor
timestamp: August 07, 2015, 07:05:22 pm
content: I've found that my -2v was not okay. I've traced it to U13 loading down this bus. Anyone have a 'control chip' 1820-1742 lying about in their junk drawer?