hybridfree/eevblog-posts huggingface dataset:
What EICO capacitor tester really test? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: October 08, 2019, 10:35:57 am
content: HiI google for manual and it says what this tester is simple bridgehttps://www.radiomuseum.org/dsp_multipage_pdf.cfm?pdf=eico_950.pdfWhy it is "tester"?Any advantages vs modern multimeters? (1990-200 I mean)

author: jsantoro
author_rank: Regular Contributor
timestamp: October 08, 2019, 01:30:43 pm
content: It can test leakage at operating voltages, up to 400v. It's especially useful for tube gear.

author: Seekonk
author_rank: Super Contributor
timestamp: October 08, 2019, 08:06:00 pm
content: I used to sell rebuild kits for these and the Heathkit C3. Could never figure out why people held onto these. The mod replaced the rectifier with solid state leaving a tube socket to install a simple triode amplifier. A gain of three helped these out a lot. Any more made them hard to read. I used to keep one around just for the high voltage leakage test. Now I have a Sencore for the high voltage test. Not a great cap meter, but love the high voltage leakage test for caps and semiconductors.

author: bob91343
author_rank: Super Contributor
timestamp: October 08, 2019, 08:42:24 pm
content: And I use the GR 1644 for leakage, the GR 1658 for LCR.The EICO sits in the closet. Maybe I'll take it to the next swap meet.

author: 001
author_rank: Super Contributor
timestamp: October 09, 2019, 08:05:30 pm
content: Do You use it as leackage tester only? Is it better test than megger?

author: bob91343
author_rank: Super Contributor
timestamp: October 14, 2019, 09:16:52 pm
content: The leakage test is primarily for electrolytic capacitors, which often get leaky with age.The capacitance measurement isn't very accurate but will find open capacitors (rare!) and allow one to identify those without markings. The resistance scales are nearly useless. The comparison function on the EICO and others is also not too useful due to insufficient resolution, although that depends on the application.Cheap service type instruments are not generally good for much. But their price indicates that. Once you use first rate gear you won't want to turn back. Having said that, there are places where they can serve useful functions but I believe it's out of proportion considering the extra fuss and bench space required.
UEI AC30 clamp - Page 1
Forum section: electronics / testgear

author: drumbum
author_rank: Contributor
timestamp: October 09, 2019, 04:17:47 pm
content: Hello gentlemen,Has anyone had experience with the UEI ac30 clamp adapter? I believe the item is discontinued.Considering a purchase.Any input appreciated.

author: drumbum
author_rank: Contributor
timestamp: October 10, 2019, 07:41:44 pm
content: bump for visi

author: drumbum
author_rank: Contributor
timestamp: October 10, 2019, 08:22:31 pm
content: Dangit! CA-30
HP 53310a UCIC chip bad - Page 1
Forum section: electronics / testgear

author: Hgspine
author_rank: Contributor
timestamp: October 13, 2019, 11:46:10 pm
content: Hi there,My HP 53310a MDA is not working and the tech has found a bad UCIC chip on the A1 board.Has anyone here ever run into this same problem and found a solution?Thank you.

author: TurboTom
author_rank: Super Contributor
timestamp: October 14, 2019, 01:14:32 am
content: Ouch, that's bad news. The UCIC is the TDC (time-digital-converter), the chip where all the magic happens... Apparently it's been made by or specifically for HP, their part number is 1SL5-0125. There's probably little chance sourcing one of these NOS. I'ld rather watch out for a cheap 53310A, maybe a parts / defective unit. I have never heard of one of these chips failing but this doesn't mean much. Are you sure it's the UCIC and has your technichan the experience to track the fault down to this semiconductor? Please don't get me wrong, I'm not questioning your tech's skills but the 53310A is a mighty complex machine, and even with the CLIP (component level information package) available, the operating principles, especially around the UCIC, stay pretty much in the dark. There doesn't seem to be a datasheet or any in-depth description of this semiconductor available. At least I wasn't able to find one.What's the actual problem, does the MDA report some errors or is it simply "dead"?

author: Kosmic
author_rank: Super Contributor
timestamp: October 14, 2019, 01:23:30 am
content: Biggest problem on the 53310a (and some scope from the same era) is the power supply. If you never recapped the power supply and your device was just not starting anymore or shutting down by itself it's probably the power supply.

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: October 14, 2019, 01:34:12 am
content: One of mine 53310a always had one self-test fail, for UCIC Programmable Logic Array, but it doesn't seem to affect the operation of the device in any obvious way.

author: Hgspine
author_rank: Contributor
timestamp: October 14, 2019, 01:37:37 am
content: He tested the power supply and all good. He built an extension cable for the power supply to be able to work on it with the power supply away from the unit.

author: Hgspine
author_rank: Contributor
timestamp: October 14, 2019, 01:48:26 am
content: It fails tests for RAM, GAIN, Interpolators and UCIC.

author: TurboTom
author_rank: Super Contributor
timestamp: October 14, 2019, 10:21:24 am
content: This multitude of errors doesn't appear indicative to me for a genuine UCIC failure. All the affected modules are somehow related to the buffered data bus (BDBUS). So I would first take a closer look at the bus drivers / buffers on the A3 CPU board (U70 and U71) and check the signal appearance on all the buffered data lines for plausibility. If a signal appears wonky, track it down to the source.The cause could also be an address decoder but I'ld expect not that many errors if one goes bad...Would it be possible to get access to a second MDA so you could swap boards to localize the problem?
TTi Thurlby Thandar QL355T out of spec - Page 1
Forum section: electronics / testgear

author: Rainer Dynszis
author_rank: Newbie
timestamp: October 10, 2019, 07:19:35 pm
content: So I saw a new TTi QL355T offered for less than half the list price, and could not resist.Turns out the instrument is out of spec, i.e. its voltage deviates more than the specified 0.03% + 5 mV at higher voltages (where the summand becomes smaller in proportion). Its feet had been attached wrongly, and the front plate is askew.I have returned it for a refund. I'm not sure whether this is typical for TTi's QC?Thanks for any opinions.
Oscilloscope temperature sensor or transducer - Page 1
Forum section: electronics / testgear

author: SG-1
author_rank: Regular Contributor
timestamp: October 10, 2019, 03:16:38 am
content: I am in need of a temperature sensor or transducer for an oscilloscope.Currently running an experiment with a 15A circuit breaker in an elevated ambient temperature. Seeing how an elevated ambient temperature effects the trip curve,I can measure & record the current over a 12 hour period (fluke 189), but cannot record a correlated temperature reading.My two channel scope (fluke 196C) seem to be part of the solution, but having trouble finding a temperature probe for the second channel.The temperature extremes range from 20 to 75 degrees C.Would like to find a plug & play solution.

author: KaneTW
author_rank: Frequent Contributor
timestamp: October 10, 2019, 05:50:57 am
content: I would just record it separately with some data logger and correlate when processing the data.

author: 2N3055
author_rank: Super Contributor
timestamp: October 10, 2019, 08:18:28 am
content: You need one of those temp sensor signal conditioning modules that take temp sensor as input ( TC, RTD or thermistor) and outputs 10V output.Or like KaneTW said, simply log it separately and correlate data. It doesn't have to be synchronised to microsecond.
Tube voltmeter vs typical multimeter - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: October 08, 2019, 10:26:23 am
content: HiIs tube voltmeter has any benefits vs typical modern multimeter? (I mean DMM produced 1990-2000)

author: TimFox
author_rank: Super Contributor
timestamp: October 08, 2019, 01:16:11 pm
content: The main advantage of a VTVM over a modern DMM is the 1 megohm resistor in the probe. This isolates the reactance of the probe cable or wires from the point being measured. This is important for higher impedance nodes that may have AC voltage on them, such as an un-bypassed cathode in a tube amplifier. The reactance of the probe cable can affect the high-frequency performance: in worst case, that could cause oscillation and shift the DC voltage greatly. This is not important when looking at a point with only DC, such as the power rails.I have never seen such a probe resistor on a digital device, but one can be improvised easily (this will change the voltage calibration, but the math is easy).

author: Ringmodulator
author_rank: Regular Contributor
timestamp: October 08, 2019, 02:12:13 pm
content: Hi,my opinion:There are some instances, like alignment of an HF transceiver, where an analogue instrument is preferable.Jumping numbers on a DMM can be quite anoying.The other question then would be VTVM (Vacuum Tbe Volt Meter) vs. conventional analogue multimeter.The VTVMs were popular because of their high input impedance in relation to the earlier generation passive multimeters with lower input impedance.Masuring in high impedance circuits with a low impedance meter gives you misleading readings and present a burden to the DUT.Analogue multimeters with an active high impedance input made the passive ones obsolete.In this respect, they are as usable as the VTVMs.VTVMs are rumoured to be more robust, but I think that this is questionable.RegardsChris

author: vk6zgo
author_rank: Super Contributor
timestamp: October 08, 2019, 02:42:06 pm
content: Such things as the HP 410C use an RF probe for the ac range.Although I say "RF" probe, its frequency range reaches from 20Hz to 700Mhz.http://www.hparchive.com/Manuals/HP-410C-Manual-sn-311-328-339-433-532-550-807.pdfIn contrast, a typical DMM's ac response falls off after a few 10s of kHz.There is a workaround, however, as you can make an RF probe to use with your DMM.These have been described many times on the Internet.

author: TimFox
author_rank: Super Contributor
timestamp: October 08, 2019, 08:56:53 pm
content: The 410 series has a special RF/AC probe with a high frequency diode for AC voltage measurements, and a DC voltage probe with a 10 megohm resistor (110 megohm total resistance) for DC measurements.
rigol dp832 acceptable precision - Page 1
Forum section: electronics / testgear

author: Redeeman
author_rank: Contributor
timestamp: October 07, 2019, 06:33:33 pm
content: Hello.Bought a DP832, and straight out the box, it read 0.01v on channel 1, 0.06v on channel 2, 0.00v on channel 3.I thought this 0.06v atleast on channel 2 was a bit high off. I suspect even off spec, but certainly if one were to buy the high accuracy option. I tried riglol'ing to unlock high accuracy, but i couldnt get it to work, so I just went straight to the hack to "convert" it to a DP832A. Worked great, easily.now it says 0.005v on channel 1, 0.016v on channel 2, and 0.000v on channel 3.thats a bit strange, the rounding has then been quite off on channel 2?this offset seems to follow in the readout no matter where in the 0-32v range I set.What are your thoughts on this?

author: Grandchuck
author_rank: Super Contributor
timestamp: October 07, 2019, 06:59:28 pm
content: Mine (DP832 ... unhacked) gives:On channel 1, -4 mVOn channel 2, 0.5 mVOn channel 3, 0.1 mV

author: maginnovision
author_rank: Super Contributor
timestamp: October 07, 2019, 07:56:48 pm
content: Just calibrate it then and call it a day.Quote from: Grandchuck on October 07, 2019, 06:59:28 pmHow is your unhacked unit giving you microvolts for readback?

author: Grandchuck
author_rank: Super Contributor
timestamp: October 07, 2019, 07:58:45 pm
content: The reported readings were produced using a separate DMM.
Just got a Tektronix THS730a, looking for a p5102 alt, also battery door problem - Page 1
Forum section: electronics / testgear

author: scottie4442
author_rank: Unknown
timestamp: October 07, 2019, 06:17:30 pm
content: I just got a tektronix ths730a, works fine and it came with (2) p6117 probes. I looked on fleabay for 1 or 2 p5102 probes, I like to work with vacuum tube amps from time to time, and they want upwards of $300 for those things, without all the accessories such as ground clip, etc. Was wondering if there are are any decent alternatives for $200 to $250, I have a couple of stereo tube amps that use 480 to 500 vdc internally.Also another issue I am having is getting the battery door open, I am afraid to use pliers and breaking the door. Any suggestions.Thanks
Firmware Update for Hantek DSO5202B w/ old HW revision 10070x - Page 1
Forum section: electronics / testgear

author: Slash200
author_rank: Newbie
timestamp: October 07, 2019, 05:23:29 pm
content: Hello,I need a firmware Update for a Voltcraft DSO-3062C with HANTEK DSO5202B 2.06.3(130425.0) Firmware. The Hardware Version is 10070X555583e9The Updates on the download-portal aren't working because of the new encryption key that the newer Hardware Versions are using if I understand this right?The Hantek-Support isn't responding to my request for a Update for my HW and SW Version and the download in older threads here in this forum are expired.Can anyone please provide a downloadlink for me?One more question. When I have a firmware installed, that supports the new encryption key, am I able to install the firmwares from the hantek download portal?best regards
Beckman 3020 resistance readings off - Page 1
Forum section: electronics / testgear

author: TimeBandit
author_rank: Regular Contributor
timestamp: October 06, 2019, 09:43:16 pm
content: I have a Beckman 3020 DMM that's reading about 1 ohm high. I've tested different probes, cleaned the jacks with Deoxit, checked the precision resistors inside (they're within spec), and next plan to carry out the calibration procedure (feed 190mV DC and adjust the rheostat to match while set to the 200mV range). What else am I not thinking of?

author: retiredcaps
author_rank: Super Contributor
timestamp: October 07, 2019, 01:10:08 am
content: When you short your probes together, what do you get?1 ohm high when measuring what? 1 ohm high when measuring a 10 ohm resistor? 1 ohm high when measuring a 100 ohm resistor?

author: TimeBandit
author_rank: Regular Contributor
timestamp: October 07, 2019, 11:42:15 am
content: It's behaving now, though I'm not sure why. I did notice that the negative battery wire had a bad solder connection to the double-sided board.
Keysight N2140A probe maximum voltage - Page 1
Forum section: electronics / testgear

author: leftek
author_rank: Regular Contributor
timestamp: October 07, 2019, 08:06:14 am
content: Hello, the standard probes N2140A for Keysight oscilloscope DSOX1102A give maximum voltage 300Vpeak.That's mean that i can't measure 330Vdc? (230Vac with full bridge and filter)Here is the link.https://www.keysight.com/en/pd-2758605-pn-N2140A/passive-probe-101-200-mhz-2-pack?cc=GR&lc=eng

author: alm
author_rank: Super Contributor
timestamp: October 07, 2019, 12:05:48 pm
content: It's rated for 300 Vrms CAT II in 10:1 mode. So 330 Vdc is indeed exceeding the maximum limit. Try a 100:1 probe if you need to measure higher voltages. Since you are likely talking about something directly connected to mains, you should probably consider a high-voltage differential probe for this measurement, since you don't want to clip your ground lead to either phase or null of your mains supply.There are alternative solutions, like using two 100:1 probes, or connecting the device under test to an isolation transformer.

author: leftek
author_rank: Regular Contributor
timestamp: October 08, 2019, 05:29:54 am
content: It's normal to buy oscilloscope Keysight and you need to buy separate probes for rectified voltage of 230Vac (320-330Vdc)?This is not HIGH VOLTAGE. All of the rest manufactures have maximum voltage 400V.

author: JFJ
author_rank: Regular Contributor
timestamp: October 08, 2019, 03:33:58 pm
content: Quote from: leftek on October 08, 2019, 05:29:54 amFor a pure sine wave input, your probe's 300 VRMSrating would be equivalent to a peak rating of 424 V (VP= VRMSx √2). Be aware that the maximum AC voltage rating of a passive probe is frequency dependent (it decreases as the input frequency increases). For example, this is the voltage derating curve for a LeCroy PP008 10:1 passive probe:and this is its input impedance vs frequency:

author: leftek
author_rank: Regular Contributor
timestamp: October 08, 2019, 03:56:41 pm
content: Thank you for your information. I had confused, but now it's clear.
TDS 210 burnt resistor value  - Page 1
Forum section: electronics / testgear

author: kosomsk
author_rank: Regular Contributor
timestamp: October 06, 2019, 06:59:29 am
content: Hi all! I have a broken Tektronix TDS 210I need high resolution photo of mainbord or R136 valueR136 resistor near J302 (LCD connector on MB)Who can help ?)

author: Simon
author_rank: Unknown
timestamp: October 06, 2019, 10:49:39 am
content: Please do not double post.
Thoughts on the Beha Amprobe Telaris Proinstall 100 - Page 1
Forum section: electronics / testgear

author: ckambiselis
author_rank: Regular Contributor
timestamp: October 05, 2019, 02:12:22 pm
content: Hi,Looking for opinions from users of the Beha-Amprobe Telaris Proinstall 100 or 200, has it been reliable, any issues, if you have used the Fluke one, how does it compare. I have used the Fluke 1663 and was wondering how the Proinstall compares to it before buying one.ThanksOscar
Agilent 54831 upgrades - Page 1
Forum section: electronics / testgear

author: Mrt12
author_rank: Regular Contributor
timestamp: March 04, 2017, 11:00:05 am
content: Hi,a few weeks ago I had some trouble with my 54831B DSO. I searched this forum for repair tips, and I was successful, my scope works! But while reading on the forum, I saw that some members upgraded their scopes. For instance, it is possible to increase the bandwidth by removing a single 1k resistor, which I did and my scope now thinks it is a 54832 ;-)Thats nice, but I would also like to upgrade the memory. When I had my scope open for repair, I saw that the fill 128M memory is installed on the acquisition board, but in the scope software, I can see only 2M, I think this is because the remaining memory is an option. In some other threads I read that some forum members were able to upgrade the options, but unfortunately, this seems to work only with the Windows XP scopes. My device is equipped with Windows 98. Should I upgrade to XP, and is that possible? I have the VP22 mainboard inside.a) is it possible to upgrade to XP, and does it make sense;b) is it possible to use the full 128M memory with the Windows 98?In this thread ->https://www.eevblog.com/forum/testgear/agilent-54831d-modernising/msg1065659/#msg1065659there is a patch for the agscope.exe, but my scope has no agscope.exe because it is the older Win98 version, which only has an Ag5483x.exe. How could I upgrade my machine? :-)

author: tonykara
author_rank: Contributor
timestamp: October 06, 2019, 10:11:34 pm
content: Did you ever make any progress with this?
Chroma 66202 Power Meter calibration catch 22 - Page 1
Forum section: electronics / testgear

author: Electrole
author_rank: Contributor
timestamp: October 06, 2019, 10:22:07 am
content: I have a Chroma 66202 Digital Power Meter that provided measurement results a bit too off. Consequently, I decided to calibrate it. There's a description in the manual, so what could go wrong? As it turned out, everything with the calibration of the Chroma 66202 can go spectacularly wrong! The issue is that if an error during the calibration happens, like a voltage is not present when it is supposed to be present, which actually happended in my case, the 66202 apparently saves a way off calibration factor. Then, when attempting to carry out a measurement or a calibration again, the 66202 deems the signal faulty, as the erronous calibration factor is used, and following this, the 66202 will not correct the calibration factor. Indeed a catch 22 of calibration designed into the 66202. My 66202 is now rendered utterly useless.There does not seem to be any command to reset the calibration constant, nor any power-on hardware feature that could put the 66202 into a well-known state. Contacting Chroma had the expected result: Zero support. I then had the idea that I could perhaps analyze the bit code of an EEPROM and identify the calibration constants, and change them as needed. Another solution could be to get a fresh bit file and update the contents of the EEPROM in question.Does anyone of you have any experience with this issue with the Chroma 66202Suggestions are appreciated...Best regards
Logic analyzer harness for Keysight MSOX 2000 series - Page 1
Forum section: electronics / testgear

author: swineone
author_rank: Contributor
timestamp: October 05, 2019, 01:05:21 pm
content: Hi,With the help from the kind members of the forum, I was able to hack my DSOX2004A to include the logic analyzer option (MSOX upgrade).Now I'm looking to buy or make the logic analyzer harness to use this feature.Can anyone recommend a ready-made harness to buy from AliExpress or Ebay? Unfortunately the stock Keysight part is out of my price range.I'll mostly use it to debug low-frequency (< 1 MHz) I2C or SPI signals, so I don't think high-quality woven cables are necessary.Thanks
DC current resolution of Fluke 87-V - Page 1
Forum section: electronics / testgear

author: balage
author_rank: Regular Contributor
timestamp: October 04, 2019, 01:05:26 pm
content: Hi,I have searched for the specs of Fluke's 87V DMM. Actually I have found two types: 87-5 and 87-V. Don't know what is the difference between them:https://hu.farnell.com/fluke/fluke-87-v-e2k-eur/digital-multimeter-true-rms-10a/dp/2889341?st=fluke%2087https://hu.farnell.com/fluke/fluke-87-5-e2k-eur/electrician-kit-fluke-87v-e2/dp/1895811?st=fluke%2087But the confusing thing is not that, but that in one datasheet it has a 0,01uA resolution and in the other it has 0,1uA. For example fluke.com says 0,01uA down at specs tab:https://www.fluke-direct.com/product/fluke-87-5-industrial-multimeterI have one that is around 4-5 years old, but it has definitely 0,1uA resolution.Is it possible that there are different revisions of them?

author: LazyJack
author_rank: Frequent Contributor
timestamp: October 04, 2019, 02:12:35 pm
content: You have to turn on hi-res mode for 0.01uA resolution. Press the light button for 2 seconds on the fluke 87V (same as -5) to turn it on and off.On the older (non -V) 87s, hi-res mode is a turn on option, press the light button while turning on and it will give you the extended resolution (and will be quite slow).I just verified it that it will give you 0.01uA resolution on both the newer and the older Fluke 87s.

author: mr.fabe
author_rank: Regular Contributor
timestamp: October 05, 2019, 12:20:32 am
content: The Fluke 87V and 87-5 are the same exact meters. V is Five in roman numerals. Take a look the pictures of the 87-5 unit. You will see 87V.

author: balage
author_rank: Regular Contributor
timestamp: October 06, 2019, 10:16:24 am
content: Thank you for your answers guys!I should have read the manual.
Agilent 1732C strange on Mohms - Page 1
Forum section: electronics / testgear

author: Andrejka
author_rank: Contributor
timestamp: October 04, 2019, 06:08:48 pm
content: Hello,Question for someone who owns Agilent U1700 series LCR meter.This is is fault or normal behavior, when nothing is connected meter still shows in R mode around 100 megaohms resistance.ThanksAndrej

author: mr.fabe
author_rank: Regular Contributor
timestamp: October 04, 2019, 08:10:56 pm
content: I tried replicating your settings on a Keysight U1733C and this is what I get...

author: Per Hansson
author_rank: Unknown
timestamp: October 04, 2019, 09:14:00 pm
content: On my U1733C if I have the crocodile clips connected like you it hunts between KΩ and MΩBut if I remove the leads it shows 0.LOr if I connect the SMD tweezers it also shows 0.LI assume the reading is from capacitive coupling to the unshielded cables?

author: Andrejka
author_rank: Contributor
timestamp: October 05, 2019, 06:19:33 am
content: I have 10Mohm 0,1% precision resistor, while on Fluke is stable 10,00 reading, on Agilent is 9,21 and very slowly increasing. Resistor was inserted directly to meter's socket. When nothing connected - reading's floating between 180 - 199 Mohm.Something is damaged?Thanks

author: Per Hansson
author_rank: Unknown
timestamp: October 05, 2019, 06:45:33 am
content: Yes that is not good, maybe something is damaged or it could be as simple as PCB contamination.I.e. cleaning the PCB might fix it if it looks dirty of flux or anything foreign that has went inside...

author: rodpp
author_rank: Frequent Contributor
timestamp: October 05, 2019, 11:45:56 am
content: In my U1733C it is erratic, sometimes it displays OL, sometimes floating around 5M.There is a frequency correlation, if it is set to 100Hz or 120Hz it always display OL. If set to 1KHz or 10KHz, it displays some Mohms. And the readings on the 10KHz are lower than on the 1KHz.At 100KHz there is no Mohm measurements.
FeelElec FY6800 output voltage too high - Page 1
Forum section: electronics / testgear

author: hb2003
author_rank: Newbie
timestamp: October 05, 2019, 10:14:53 am
content: Hi,purchased a FY6800 from Amazon and have a problem with the output voltage. The default amplitude gives me a 50Vpp signal instead of a 5Vpp on my oscilloscope without load and at 50 ohm still 25Vpp. The firmware is V1.7.1. I've already exchanged the device, but it's behaving the same way.With amplitude at max of 20V the output is over 200Vpp without load.Any ideas, someone?

author: JackJones
author_rank: Regular Contributor
timestamp: October 05, 2019, 10:21:30 am
content: I bet you have your probe set up as 1x and the oscilloscope is expecting it to be 10x. That is why everything is showing at 10x the voltage it really is.

author: hb2003
author_rank: Newbie
timestamp: October 05, 2019, 10:37:46 am
content: You are right. Silly me.
Talk about bad customer service from Rigol USA  - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: October 05, 2019, 03:14:54 am
content: I purchase a Rigol MSO5000 on September 25 2019 from Tequipment and Rigol will not give me the free upgrades.AztlanRIGOL Support <license_activation@rigoltech.com>5:40 PM (2 hours ago)to meThank you for sharing your contact information with us regarding our current promotions for your recent RIGOL purchase.Unfortunately, our system indicates that your instrument was purchased outside of the promotion window and is not eligible to receive the free upgrade. If you believe this is an error, please feel free to contact us directly at 877-4-RIGOL-1 or info@rigol.com to discuss it. Our office hours are M-F, 7am-5pm PST.Sincerely, RIGOL USARIGOL Technologies8140 SW Nimbus Ave.Beaverton, OR 97008877-4-RIGOL-1www.rigolna.com

author: DaJMasta
author_rank: Super Contributor
timestamp: October 05, 2019, 04:07:29 am
content: Isn't this something to take up with Tequipment? If not then, maybe the other Rigol email or phone numberhttp://beyondmeasure.rigoltech.com/acton/form/1579/0065:/0/index.htm?sid=TV2:Kt5oPeWlY(if that link even works)?I don't see any listing of when the promotional dates actually are, so we can't say for sure what should have been applicable on the given information, but was your unit a new one or an open box/refurb which was likely bought earlier and would not have been eligible?

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: October 05, 2019, 04:14:05 am
content: That is too bad given you only missed the window by less than a week, if I were you, I would return it, get a refund, and rebuy if you still want a Rigol after your recent experience. Let them deal with the loss associated with the return open box. Or buy a different brand if you don’t like how you are treated.They have a 30 day return policy, it is dumb to deny upgrade to buyers who purchased the scope less than 30 days before the return period. The are asking for a warehouse full of open box returns. Anyone who has worked in retail strategy or operation could teach them a lesson in the consumer market in how to deal with these situations.If I were Rigol, I would give these features away for free for all current owners if they buy the logic probe as an upgrade. So their strongest supporters - those of us who were willing to buy the scope early when it was buggy, would feel like there’s a way to be included in the promo. It will help them to drive goodwill in the community and retain customer loyalty.
Power supply field messing with CRT oscilloscope? - Page 1
Forum section: electronics / testgear

author: Jon86
author_rank: Frequent Contributor
timestamp: October 04, 2019, 08:00:54 pm
content: I bought a Tenma dual supply from one of the kind folks on this forum, and to save space on my desk I put the power supply on top of my CRT (but digital storage) oscilloscope.Turning it on I noticed the display jump and rotate towards the upper right, as the supply made a kind of metallic 'pop' noise when I turned it on.Doing it again seemed to move the display back closer to the center, and again further still, but it still sits kind of wonky.I've moved the power supply away, at least 20cm or so, and no longer in the same orientation, but the problem still persists. Not every time I turn it on, but I can see the display jump on occasion.Clearly it must be the H-field from the supply transformer but I never really gave it a thought, since I didn't expect test gear to have that much of a problem sitting near other test gear (magnetic shielding etc where necessary). But now, I'm starting to worry about damaging my poor 9400A from doing this too often.Is there something strange going on here? Or has this pitfall of CRTs just escaped me all this time?Also, is there any easy way to degauss this thing? What kind of field strength would be required?

author: AVGresponding
author_rank: Super Contributor
timestamp: October 04, 2019, 08:17:50 pm
content: CRT/CRO displays are quite sensitive to electromagnetic fields.If you lived near a radar station for example (ie on an Air Force base) back when TVs were all CRT, you'd become quite familiar with this effect, even at a range of several hundred metres, making it hard to keep track of snooker programsThe effect can be permanent if it's strong enough and long enough in durationIt's not limited to the display either, I've discovered I have to reorganise my TE setup as my desktop pc is interfering with the triggering on my scope (old school Tek CRO DSO)

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: October 05, 2019, 04:54:47 am
content: Most TVs has degaussing coil run from a PTC resistor on power up. We used to re-orientate TV screens N/S, E/W and re-do this power on degaussing as this took out earth field line effects.CRT scopes use electrostatic deflection ang have shields to protect from fields. Maybe the shield is missing or magnetised??? Try a degaussing coil wand. keep the PSU away from the scope.
YIHUA1503D how current limiter work? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: October 03, 2019, 01:41:15 pm
content: Hi!It is analog power unitDo You have any ideas how "current conversion" toggle work? Schematics, etc?

author: graybeard
author_rank: Frequent Contributor
timestamp: October 03, 2019, 03:47:02 pm
content: My guess is they are switching in different series sense resisters for the different ranges with the 300mA resistor being ten times the value of the 3A sense resistor.
Datron  470X and 106X plasma displays - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: October 02, 2019, 08:45:38 pm
content: They are still available by special order, don't know if there is a minimum quantity.Mouser PN:78-PD009D06401G02CUST PN:MFR PN: PD009D06401G02Plasma DisplayVishay Plasma DisplaysRoHS: Non-Compliant/Contains PbECCN: EAR99Factory Special Order

author: coromonadalix
author_rank: Super Contributor
timestamp: October 02, 2019, 10:23:12 pm
content: 101 -103 weeks of lead time

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: October 03, 2019, 08:42:29 pm
content: And no stated min. quantity either....
China DC/DC modules with indicators (Need help) - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: October 03, 2019, 01:09:20 pm
content: HiI mean what some similar treads must issued here. But I can`t find oneI`m looking for infoWhat type is good and what is bad?

author: ledtester
author_rank: Super Contributor
timestamp: October 03, 2019, 01:34:26 pm
content: Do you have an ebay/amazon/aliexpress link for the first one?The second one is made by Ruideng, has been around for a while, has numerous reviews and generally meets its specifications. You can view their full product line here:https://rdtech.aliexpress.com/store/923042QuoteAre you looking for reviews?

author: 001
author_rank: Super Contributor
timestamp: October 03, 2019, 01:43:15 pm
content: Quote from: ledtester on October 03, 2019, 01:34:26 pmThanx a lot! I can`t find right name to google it

author: ebclr
author_rank: Super Contributor
timestamp: October 03, 2019, 06:59:45 pm
content: 1st one a cheap trash2nd one Works well, not perfect but acceptable
Rigol electronic load working principle - Page 1
Forum section: electronics / testgear

author: Roeland
author_rank: Newbie
timestamp: October 03, 2019, 11:36:30 am
content: I am working with a Rigol DL3021A DC electronic load and to explain some of the measurements result I want to know whats the working principle of the load.is there a physique resister or is there a sort of switch to regulate the output load?can some help me with this?

author: ledtester
author_rank: Super Contributor
timestamp: October 03, 2019, 01:18:45 pm
content: There is usually a bank of MOSFET transistors which are used to control the current drawn by the load.Here Dave does a teardown of the Rigol load (started at 7:28):https://youtu.be/Tk_3rYKWIIg?t=7m28sThe MOSFETs are the transistors attached to the big heatsink.In this video Dave explains how an op-amp controlled constant-current load works:https://youtu.be/8xX2SVcItOA?t=2m15s

author: MarkF
author_rank: Super Contributor
timestamp: October 03, 2019, 05:45:09 pm
content: Here is the circuit for a HP-6060 Electronic Load. (I would expect the Rigol to be similar.)https://www.eevblog.com/forum/projects/my-first-power-supply-182985/?action=dlattach;attach=846488;image
LCD x-digit display insulation to user - Page 1
Forum section: electronics / testgear

author: trobbins
author_rank: Frequent Contributor
timestamp: October 05, 2019, 02:59:51 am
content: Some x-digit LCD display meters are finding their way in to metering applications where the LCD meter is sitting at some hazardous voltage with respect to the user.I'm guessing all commercial handheld meters that use LCD displays would be using a supplementary insulation cover film of at least 0.4mm thickness, and with bonding around the display edges so that creepage/clearance is not a concern. That supplementary insulation is probably a requirement for any CAT rating, even CAT I, and of course there are a myriad of test instrument related standards where that issue is likely defined within.So my query relates to DIY use of such LCD displays/meters, and probably 'semi-commercial' or international commercial products that don't align themselves with specific test instrument standards, but are being used in applications that are essentially energy limited, secondary-side (ie. not mains side connection), but are galvanically connected to circuitry at above typical defined extra low voltage levels that have been used in various standards (like 42V, 50V, 60V, 120V, 150V). I'm not referring to applications where the display is powered from a circuit near earth potential and probing a high voltage level, but rather where the measuring circuit/display is connecting to an equipment node that has a hazardous voltage with respect to earth.It seems that the inherent glass cover of an LCD display is quite thin (eg. possibly below 0.4mm), but as long as it is not cracked, and there are no creepage/clearance concerns around its user accessible perimeter, then it provides a basic insulation function.The query is should a supplementary insulation layer be added for any application where connection is above some defined low voltage level, and how does that relate to typically relevant standards for test/measurement equipment.One application of interest is with valve/tube amplifier test gear, where DIY'ers are floating measurement devices up to 'output stage' anode voltage levels which can idle at a few hundred voltage DC (up to about 500-600V typically), but can also swing during operation to voltages well in excess of 1kV.
Agilent / Keysight Logic Analyzer BIOS update CD 16900-14122 .ISO image? - Page 1
Forum section: electronics / testgear

author: gslick
author_rank: Frequent Contributor
timestamp: October 17, 2017, 10:30:20 pm
content: Anyone happen to have a copy of the Agilent Logic Analyzer BIOS update CD, part number 16900-14122, or an .ISO image of it available?This looks like one of the files that is sometimes available for short periods of time on the Keysight FTP site before it disappears again and then you need to find the right person to ask nicely to make it available again there.http://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=1693762How can I update the BIOS on my Keysight Logic Analyzer?The BIOS for all 1680, 16800, and 16900-series logic analyzers can be updated via a single BIOS update CD.As of May 1, 2009, the latest BIOS update CD is part number 16900-14122. This BIOS CD serves all Agilent 1680, 16800, and 16900 series logic analyzers. The .iso image of this CD is available for download atftp://ftp.keysight.com/cos/outbound/BIOS/

author: gslick
author_rank: Frequent Contributor
timestamp: October 19, 2017, 10:33:01 pm
content: The BIOS update .ISO image file 16900-14122.iso is currently available here as of 10/19/17. If anyone else wants this then grab a copy now before it disappears again in a week from now.ftp://ftp.keysight.com/cos/outbound/16xxx%20recovery%20images/16900-14122/

author: texaspyro
author_rank: Super Contributor
timestamp: October 20, 2017, 06:04:24 am
content: Upload it to ko4bb.com for the benefit of future generations...

author: Sparky
author_rank: Frequent Contributor
timestamp: October 03, 2019, 06:31:56 am
content: Quote from: gslick on October 19, 2017, 10:33:01 pmHello gslick! As you guessed the BIOS file cannot be accessed via the keysight FTP anymore. Can you upload it somewhere please?Thank you!
Rohde & Schwarz SME03 Service Manual  - Page 1
Forum section: electronics / testgear

author: AG6AV
author_rank: Contributor
timestamp: June 03, 2015, 01:24:37 am
content: I would appreciate anyone giving me advise on how to obtain a service manual for a Rohde & Schwarz SME03.I have a Rohde & Schwarz SME03. It is a RF signal generator which covers 5Kc to 3Gigc. However, the screen went dark as if the contrast control is malfunctioning. I want to repair the unit, but I am having difficulty obtaining a service manual. I have a copy of the operating manual, but it doesn't have one PCB schematic, or theory of operation in it. I contacted Kimberly.Scott@rsa.rohde-schwarz.com in customer service. Kimberly stated that they don't have a service manual. I don't have confidence in Kimberly's response.Thanks,Nathan Haltman

author: tautech
author_rank: Super Contributor
timestamp: June 03, 2015, 03:00:25 am
content: Welcome to the forum.Thread might have been better placed in the Repair board, plenty of links to manuals there.This might be of assistance:http://www.manualsdir.com/manuals/319547/atec-rohde-schwarz-sme-series.html

author: AG6AV
author_rank: Contributor
timestamp: June 03, 2015, 11:52:15 pm
content: Thanks for the tip on the "repair" section of the forum. I looks at the URL, but I only saw a two page discription of the SME03.

author: tautech
author_rank: Super Contributor
timestamp: June 04, 2015, 01:48:30 am
content: Have you tried the R&S Yahoo group?https://groups.yahoo.com/neo/groups/Rohde_Schwarz/info

author: tautech
author_rank: Super Contributor
timestamp: June 04, 2015, 02:04:17 am
content: Have a good look at KO4BB's Manuals Repository, they have a good amout of R&S manuals.Note the SMT manual with SME in brackets MIGHT be the one you are looking for.http://www.ko4bb.com/manuals/index.php?dir=Rohde_Schwarz

author: AG6AV
author_rank: Contributor
timestamp: June 05, 2015, 05:11:01 am
content: I think you got it. I am not sure what the difference is between the SME and the SMT, but they seem to be vary similar.

author: COSMOS2K
author_rank: Contributor
timestamp: October 02, 2019, 09:39:02 pm
content: Quote from: AG6AV on June 03, 2015, 01:24:37 amHello:From R&S you will not get a valid answer, their policies require that if you want something you have to pay yes or yes.It is a pity that a brand like this is still immersed in strange policies that affect the poor users of R&S devices.Regards.
Mystery Scope  Hitachi V-352F - Page 1
Forum section: electronics / testgear

author: Cadmandu
author_rank: Newbie
timestamp: October 02, 2019, 07:07:10 pm
content: Hi allI bought the above scope and I can't find the operator or owners manual anywhere.I did find the service manual that is titled v202F / v352f.I can't find one for sale or reproduced. If I found a v202f would that work?Thanks
Griffin Novascope - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: October 06, 2019, 11:15:48 pm
content: Well had a very productive and economical dayA friend needed a van to move some furniture so put the fuel in and we set off. Knowing where we were going from the previous day I managed to locate a free (faulty) amp and a free cab {after re-soldering one wire the amp now works and the cab worked anyway).... So winner there but whilst looking I noticed a device called a Novascope..... I mentioned it and my friend got it me for taking her, which was nice, so effectively three freebies in a day.Anyway here it is......It's called a Novascope. I've not taken it apart yet but it's a slow oscilloscope using 4mm banana inputs with inputs for AC and DC coupling. I connected it to a speaker 'I had on the bench and it appears to work nicely at audio frequencies.Has anyone seen one before, it was advertised at £10 and apparently he had four (I got the last).I have a decent scope but picked this up out of interest more than anything else.I found a thread which I think is talking about the same scope and it includes a schematic but no image. Looking at the schematic it ticks all the boxes so is likely the correct one.

author: xrunner
author_rank: Super Contributor
timestamp: October 07, 2019, 12:21:42 am
content: Interesting. So are the graticules calibrated in volts or mV or what - simple enough to find out I suppose. It looks like it's just maybe for looking to see if an audio signal is "there' without too much regard for what it's frequency or amplitude is? Basic signal tracing?
KL283 Electronic Load - Page 1
Forum section: electronics / testgear

author: piguy101
author_rank: Regular Contributor
timestamp: June 28, 2018, 01:42:53 am
content: Does anyone have any experience with the KL283 load? It is a two-channel load 80 V, 15 A each, which apparently can be paralleled for 30 A. I am having trouble finding any reviews or the operating manual online to get more information.Here's an example of an Ebay listing I see:https://www.ebay.com/itm/110V-Dual-Channel-DC-Electronic-Load-Adjustable-LED-Lighting-CC-CV-KL283-PRO/183294024227?hash=item2aad2cda23:g:8fQAAOSwqYBbM4RW

author: larsdenmark
author_rank: Regular Contributor
timestamp: June 28, 2018, 06:53:02 am
content: There are a few reviews available on Amazon. Some of them appear to be genuine. There is even a few pictures of the inside of the unit:https://www.amazon.com/T-king-KL283-Channel-Adjustable-Electronic/product-reviews/B015HM17MUThe manual is reported as "not having a single word of English in it".

author: BillB
author_rank: Unknown
timestamp: June 28, 2018, 12:18:57 pm
content: I almost pulled the trigger on one of those, but in the end decided to opt for something programmable. However, in my research of reviews and whatnot, they seemed to be OK for the money. I never could find a manual. While sold under several different names, KUNKIN KL283 seems to be the most common.

author: piguy101
author_rank: Regular Contributor
timestamp: July 01, 2018, 04:49:12 pm
content: Thanks for the info and link. I am temped by the load because it appears to be cheaper than products with similar specifications. Programmable capabilities might be nice though. Hmm

author: Gregg
author_rank: Super Contributor
timestamp: July 01, 2018, 06:52:01 pm
content: I purchased a Kunkin KL283 a little over a year ago and it performs as expected. It has a true isolation transformer for the mains power and they even fused and switched the line side of the 120V input; unlike many Chinese products. The metering is close to my Fluke 189. I think it is a good hobbyist product for the price; maybe not suitable for true precision work. Both control boards appear to be identical.

author: Synthtech
author_rank: Regular Contributor
timestamp: September 21, 2018, 09:46:28 am
content: Can you use these loads to simultaneously test a plus/minus dual rail supply with a common ground, such as a +\- 15V power supply for an op-amp circuit? From looking at the specs on the eBay sellers pages it says that you can parallel the channels in CC mode and use the channels in series in CV mode so I am guessing that you could not test a dual rail +/- supply at a constant current....

author: queennikki1972
author_rank: Regular Contributor
timestamp: October 03, 2019, 05:40:54 pm
content: I ordered this unit today..
What is FLUKE MD88? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: October 01, 2019, 09:26:06 am
content: What is FLUKE MD88?What "Matco Tools" mean?

author: Ysjoelfir
author_rank: Frequent Contributor
timestamp: October 01, 2019, 10:00:53 am
content: Quote from: 001 on October 01, 2019, 09:26:06 amA Multimeter.Quote from: 001 on October 01, 2019, 09:26:06 amAn american franchise selling tools for automobility and other industries.

author: Electro Detective
author_rank: Super Contributor
timestamp: October 01, 2019, 10:05:54 am
content: It looks like the Fluke 78 or 88 Automotive Meter =

author: 001
author_rank: Super Contributor
timestamp: October 01, 2019, 11:32:51 am
content: Quote from: Electro Detective on October 01, 2019, 10:05:54 amIs it good or bad? Is it ok for $50 used?

author: retiredcaps
author_rank: Super Contributor
timestamp: October 02, 2019, 04:53:19 am
content: It's a Fluke 88 auto meter.Seehttp://mrmodemhead.com/blog/fluke-8x-faded-lcd/I would be all over it for $50.

author: Fungus
author_rank: Super Contributor
timestamp: October 02, 2019, 05:57:02 am
content: Quote from: 001 on October 01, 2019, 11:32:51 amWhy don't you go the the Fluke web site and look?