hybridfree/eevblog-posts huggingface dataset:
Siglent SPD3303X-E Output current not zero when current limit is zero - Page 1
Forum section: electronics / testgear

author: EEmuse
author_rank: Newbie
timestamp: December 11, 2018, 01:51:45 am
content: Just got a Siglent SPD3303X-E power supply. With the current limit set to 0.00A, CH1 is in CV mode and outputs voltages up to its max rating of 32V. It seems that it outputs up to 1.5mA before going into CC mode (I calculated this value using Ohm's law: I applied a known voltage across a resistor of a known value and calculated the current). Note that CH2 behaves as I would expect: it goes into CC mode when the current limit is set to 0.00A and the output voltage stays zero. Is this acceptable?

author: tautech
author_rank: Super Contributor
timestamp: December 11, 2018, 02:00:49 am
content: Welcome to the forum.Do consider the datasheet spec of 10 mV/mA resolution and the Program Accuracy spec.http://www.siglentamerica.com/wp-content/uploads/dlm_uploads/2017/10/SPD3303X_DataSheet_DS0503X-E01A.pdfCan I suggest you try the same check from within the EasyPower external software interface where 1 mA/mV adjustments are possible for X-E and X models.

author: EEmuse
author_rank: Newbie
timestamp: December 11, 2018, 06:00:33 am
content: Quote from: tautech on December 11, 2018, 02:00:49 amThank you for your reply. I tried setting the current limit to 0.000A in EasyPower, but CH1 still behaves as previously reported. Any other suggestions?

author: DaJMasta
author_rank: Super Contributor
timestamp: December 11, 2018, 06:33:54 am
content: Rather than try to calculate it, get a multimeter on the mA range on the front and see how it behaves. My SPD3303X-E (software upgraded to SPD3303X) when set to 32V and 0mA or 1mA has somewhat differing behaviors, usually charging the output gradually, but it seems there's some offset in the reading between two channels - in 1mA output mode, my channel one puts about just under 400uA, whereas channel 2 puts about 1.5mA or so when shorted. Because of the fairly week current from channel one, this causes the output to charge to a point and then partially discharge, whereas channel two charges all the way to the set 32V. Both of these measurements are within the noise floor of the instrument, and both are substantially less when set to 0mA - virtually nothing (actually reads negative) on channel one and about 430uA on channel 2.If you can measure the behavior of the outputs as leaking that much, there is probably something wrong, but it's also probably within specification - these supplies are not designed to output tiny currents. If you need a tiny amount of current supplied to your device, I suggest using a load resistor on the output terminals to keep the current output to 10mA or more as a baseline, and of course you want to be measuring those tiny currents with a meter outside of the indicator on the front panel of the power supply, the readout is not specified to read down to those tiny output levels accurately.
TV160 LVDS-VGA tester for TV main boards - hackability? - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: November 15, 2018, 01:00:38 am
content: This unit is used for testing TV main boards with an LVDS interface for the LCD, and it has a VGA output which is fixed at 1024x768 60 Hz - when I first connected it, the image was noisy and wavy, but when I properly grounded the LVDS shield, the problem was fixed; pressing the red button selects the data format (most likely for bit depth).There are two scalers programmed in the FPGA; one for the built-in LCD screen and one for the VGA output.The digital ICs are:Xilinx XC6SLX16FTG256 (FPGA - has DeviceDNA but does not offer AES encryption for the configuration - only the largest devices in the Spartan-6 family offer this encryption which can optionally be used)Winbond 25Q32 (SPI flash for FPGA configuration - also stores configuration changed by the red button)Samsung K4B1G1646G-BCK0 (64M x 16 x 8 bank DDR3-1600 SDRAM)GM7123C (330 MHz 10-bit VGA DAC - equivalent to ADV7123)043056B0-40 V3 (480x272 24-bit parallel RGB LCD)Additionally, there are three voltage level translators (two differential pairs each) for the LVDS input and the master oscillator is 27 MHz.A JTAG header (JF1) is also present.I am looking for someone capable of reprogramming the FPGA so that the VGA output is not scaled down (e.g. a 1920x1080 60 Hz output on VGA with a 1920x1080 60 Hz LVDS input) - reduced or low LCD blanking overheads should also be converted to standard blanking overheads e.g. a 1920x1080 LCD controller with a 138.5 MHz pixel clock and reduced blanking overhead input should be converted to a 148.5 MHz pixel clock with normal blanking overhead for the VGA output; so therefore, known LCD panel resolutions should be programmed with parameters for blanking overhead conversions.

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: December 11, 2018, 01:21:27 am
content: Attached is technical information and modifications; the panel LVDS interface is limited to around 600 MHz per lane, and I cannot find any functionality on unmounted switch S1.And from what I see, the LVDS clock can be up to 160 MHz and the pixel input can be either single or dual pixel, depending on the LVDS transmitter and (often panel manufacturer specific) panel receiver IC.For each pixel input (with separate clocks), 6 bit RGB uses three pairs, 8 bit RGB uses four pairs, 10 bit RGB uses five pairs (and although I have seen provision on an IC in an LG 50PG60UD, 12 bit RGB most likely uses six pairs which would not function correctly with this tester).
Fluke 79 Series III Knob Btoke - Need Service Manual To Get 6 Digit P/N - Page 1
Forum section: electronics / testgear

author: radiotek
author_rank: Contributor
timestamp: December 10, 2018, 04:02:40 pm
content: Fluke 79 Series III Knob Btoke - Need Fluke 79 Series III Service Manual to get the 6 digit P/N so I can order a new knob.Please contact me if you have the Fluke 79 III service manual.Appreciate any help.Frank

author: retiredcaps
author_rank: Super Contributor
timestamp: December 10, 2018, 08:13:23 pm
content: The Fluke 77 III service manual has the same casing and exterior build as the 79 III.The knob switch is MP11. Fluke part number is 648706.http://oldradio.tesla.hu/rajzok/muszerek/fluke77multimeter.pdfTo remove knob, seehttp://mrmodemhead.com/blog/how-to-remove-the-knob-on-a-fluke-170-series-dmm/

author: radiotek
author_rank: Contributor
timestamp: December 10, 2018, 11:06:44 pm
content: retiredcaps,You made my day !Thank you so very much !Frank

author: retiredcaps
author_rank: Super Contributor
timestamp: December 11, 2018, 04:01:01 am
content: No problem. I have a 77 III with the same split knob.

author: radiotek
author_rank: Contributor
timestamp: December 11, 2018, 04:46:00 am
content: Happy Holidays to you !
FY6600 or  FY6800 - Page 1
Forum section: electronics / testgear

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: December 10, 2018, 11:38:27 pm
content: what differences there are, between the faytech 6600 and the 6800, it is worth the 6800. it is for occasional use in the electronic hobby.no more than u $ s 100, until there my budget, to be companion of mo Rigo ds1054z.
8566B band two tracking generator  - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: December 09, 2018, 09:41:21 pm
content: I picked up this beautiful HP 8350 sweep generator with an 83525A plug-in for $150 as mentioned in the "score" thread. The 83525a plug-in is a combo of an 83522a (.01 to 2.4Ghz) and the 83540a (2.0 to 8.4Ghz) . I am posting the block diagram. A couple of people have made tracking generators for the low band of 0 to 2.5Ghz using the 83522a. This worked out because the IF output of the 8566b worked by replacing the YIG tuned oscillator and then a second oscillator was mixed a little differently and produced the needed TG signal.I don't need the low band as I have an 8568B with TG as well as my Advantest r3131a with one as well. What I would like to do is somehow use the 2.0 - 8.0Ghz side of the plug-in to cover the 8566b 2nd band from 2.0 to 5.8Ghz. I can't remember the 8566 IF for that band but I think it is in the 321Mhz range.Anyway, is this possible? Otherwise I can just use the sweep with the SA in max hold mode.ThanksJerry

author: rastro
author_rank: Frequent Contributor
timestamp: December 10, 2018, 12:24:37 am
content: Some possible resources:http://www.kerrywong.com/2016/01/10/building-a-tracking-generator/https://www.eevblog.com/forum/testgear/diy-tg-for-hp8568b/

author: cncjerry
author_rank: Unknown
timestamp: December 10, 2018, 02:38:27 am
content: Rastro, thanks, but yep, been thru all those.The problem with Kerry's version is the dynamic range. Curiousmarc's version is built on John's version using a different plug-in. That's what I mentioned above with regards to the low band 0-2.5Ghz. I can do that but doesn't buy me anything because I have the original TG for my 8568B which covers that range.Jerry

author: KE5FX
author_rank: Super Contributor
timestamp: December 10, 2018, 10:48:58 pm
content: Quote from: cncjerry on December 09, 2018, 09:41:21 pmBasically the info athttp://www.ke5fx.com/tg8566.htmlandhttp://www.ke5fx.com/tr503.htmlwill apply equally to the higher bands, once you've made allowance for the different conversion scheme. In the case of the higher bands on the 8566, the IF is 321.4 MHz.Unfortunately, because the IF is so low, the only way you can get rid of the unwanted sideband is to either use a tracking filter or a separate YTO in an offset synthesizer scheme. That's why the 85645A was so pricy (see the block diagram on page 177 ofhttps://nscainc.com/wp-content/uploads/pdf/A_85644A.pdf). Since there's already a YTF in the 8566B, it would be reasonable in most cases to just mix the LO1 output with 321.4 MHz and let the analyzer itself reject the upper mixing product.As with the lower-band TG, isolation is of paramount importance to avoid baseline lift. Also, if dynamic range is important, you will want to be able to tune the 321.4 MHz offset source at least a few kHz to either side to accommodate variations in the actual IF center frequency at the narrow resolution BW settings.
Tektronix TDS784D Input Channel 4 Failure - Page 1
Forum section: electronics / testgear

author: charlyd
author_rank: Frequent Contributor
timestamp: November 07, 2017, 11:06:47 pm
content: Hello I got a TDS784D with input failures on all inputs with a trigger constants error on channel 4.i didn t get any triggered signal in the beginning so i took out the ACQ board to get to the Attentuators.From what i saw i had 3x H2462J and 1x H2462H the last one was installed on CH 2.i ordered some sets relays to refurbish all my attentuators. and ordered a H2462J version because i want 4 of the same Hybrid plates in the scope.Replaced the relays and putted back in all the hybrids the New J version didn t arrive yet so i refurbished all 4 hybrids which came out ( 3xJ +1xH) and putted them back in scope to see what happened.the respons was much better:Ch 1 -> looks OK at first site!Ch 2 -> looks OK at first site!Ch 3 -> looks OK at first site!?!Ch 4 -> just a blue line nothing happens. ( with H2462H which should be downwards compatible from what i found on the web)When the New J version arrived and placed inside, i quickly found out the relays also had to be replaced. those relays were clicked randomly on the just arrived J version. So i ordered an extra 4 relays which will arrive in a few days after i tested with all refurbished J versions later i will give an update here....Any suggestion yet why channel 4 is giving NO response?know issue for anybody who had this problem ?

author: DC1MC
author_rank: Super Contributor
timestamp: December 10, 2018, 06:48:29 pm
content: Hi, do you happen to have the H2462H available anymore ?Cheers,DC1MC
Opinions of HP/Harrison 6201A power supply? - Page 1
Forum section: electronics / testgear

author: JonHendry
author_rank: Contributor
timestamp: December 12, 2018, 12:02:06 am
content: Just picked one up on eBay for $25 + shipping.https://www.ebay.com/itm/HP-HARRISON-LABORATORIES-MODEL-6201A-DC-POWER-SUPPLY-0-20VDC-0-1-5A/2527801502110-20VDC, 0-1.5AArrived in pretty good shape apart from the decades of gunge inside it. Some of the screws holding on front and end panels don't seem to have much grip on anything.Powered up okay, except the voltage adjust knob is a bit crusty and when starting to turn the knob from a starting point at maximum CCW, the voltage shot up to maximum when it should have still been in the sub-1V range, then it dropped back down. When I get a chance I'll try to clean the knobs.Note this isn't the6102A.
Anybody deals with GW INSTEK GPD series power supply? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: July 11, 2018, 05:04:08 pm
content: Anybody deals with GW INSTEK GPD-3303S power supply?http://www.gwinstek.com/en-global/products/DC_Power_Supply/Programmable_Multiple_Channel_DC_Power_Supplies/GPD-Series

author: jsi
author_rank: Regular Contributor
timestamp: July 11, 2018, 05:47:17 pm
content: Here's a youtube review:https://youtu.be/cX016-10mWs

author: Rolo
author_rank: Regular Contributor
timestamp: July 11, 2018, 05:50:45 pm
content: I Have a GPD-4303S, the four channel version. It's a nice unit, four channels on a relative small footprint. There were some issues in early models having overshoot in channel 3 and/or 4, can't remember exactly but that info is on this forum.I did measurements on my unit and did not see any overshoot, all channels spot on. So could be I have a later revision.Also it has one "output on" button for all channels, so all go on at the same time.If you want to know more details, please ask.https://www.eevblog.com/forum/testgear/instek-gpd-3303s-power-supply-overshoot-opinion-wanted/

author: innkeeper
author_rank: Unknown
timestamp: July 11, 2018, 05:59:46 pm
content: i love the GPD-3303S supply!!!pretty much flawless, and bulletproof. I've used and abused it a lot. and.. never seen any issues like described above, no overshoot etc.has fine and corse digital voltage and current adjustments. basically does it all, even has a usb interface and compatible with labview.. things i'll never use..i picked one up when the ITT school supplies were being blown out on EBAY for 100 bucks.SADLY, no such great deals today, but still they can be had off eBay for around 200 bucks.considering they retail for 500 bucks, that's not a bad deal. i'm keeping an eye out for a great deal to nab a second one

author: uoemx
author_rank: Contributor
timestamp: December 10, 2018, 06:01:26 am
content: Sorry everyone, my english too bad. My Power Supply not turn up voltage larger 4.5 voltage when i turn knob up, while current is nomally. What have to i do?
Keysight - U1282A - How to reduce the VSense sensitivity? - Page 1
Forum section: electronics / testgear

author: Barny
author_rank: Frequent Contributor
timestamp: December 07, 2018, 11:06:05 am
content: HelloYesterday I had to drill a hole in the wall in potential line of the power line.So I thought of the VSense function of my Keysight - U1282A to check if there are wires hidden in the wall where I want to drill.But the V-Sense function is that sensible that its beeping when I move the meter near the wall.And I think its not that likely that the complete wall consists of conducting material (the wall is a dry brick wall)Even in low sensity VSense mode the DMM is freaking out when I move it near to the wall or a wooden door.If I move the DMM fast through the air, my U1282A is starting to beep too.Is there the possibility to reduce the sensivity of VSense to an useable range?I couldn't find more detils in the manual except high / low sensitivity mode.And I couldn't make out much difference between these two modes.Or is VSense only a gimmick which is designed for 110V-US Systems and isn't useable in areas with 230V / 240V AC and W-Lan networks?

author: tsman
author_rank: Frequent Contributor
timestamp: December 08, 2018, 02:53:36 am
content: It is just the high/low sensitivity you found on the Range button.

author: Barny
author_rank: Frequent Contributor
timestamp: December 10, 2018, 11:21:02 am
content: That's sad to read.I hoped there is something like a hidden menu setting or a possibility to change the sensitivity over the IR - data port.Thanks for helping.

author: Synthtech
author_rank: Regular Contributor
timestamp: December 10, 2018, 11:26:47 am
content: I found the same thing with mine. Far too sensitive on either setting to be of much practical use.
Acceptable power supply power-on overshoot - Page 1
Forum section: electronics / testgear

author: KD0RC
author_rank: Regular Contributor
timestamp: December 09, 2018, 06:31:08 am
content: I just bought a cheap lab power supply (Korad KA3005P). It works as advertised so far, but in looking at the output on an oscilloscope, I have about 100mV of overshoot when I enable the output. The voltage rises very smoothly (looks like a capacitor charging curve), but continues past the set voltage by 100mV or so, then looks like a damped sin wave that goes a few cycles until it settles on the desired voltage. The first half cycle of the overshoot lasts somewhere around 5ms. I get this whether I have a load or not. It happens at any voltage, is not influenced by OCP or OVP settings, and is not influenced by the current set point.Is 100 mV a reasonable amount or is this supply defective? If I set my scope to 5V/Div, the curve looks perfect (like in Dave's re-review of the unit). Once I get to 100mV/Div, the ringing overshoot is very obvious. I am just trying to gauge whether this is more or less normal for this particular supply.Thanks,Len

author: tautech
author_rank: Super Contributor
timestamp: December 09, 2018, 06:47:42 am
content: Ideally you want zero overshoot and many PSU's can achieve that however in practice a project will have additional bulk capacitors that while charging can help reduce overshoot. If you look at datasheets for IC's and max Vcc we'd not normally run supply voltages too close to max so to have some leeway to accommodate variations in power ON behavior.Check it with a few different loads for piece of mind.If you like the PSU and there's no other unexpected behaviors, live with it.Datasheets and a scope are your friends.

author: Whales
author_rank: Super Contributor
timestamp: December 09, 2018, 09:37:11 am
content: Depends on what you are trying to power. 100mV out of 5V is often nothing, 100mV out of 1.2V could mean the world. Different chips have different voltage and noise tolerances (the freq of the overshoot damping/oscills can also be important. Slow often is better).I've seen PSUs with much worse overshoot, to the point you disconnect them during poweron to avoid cooking your chips.

author: nctnico
author_rank: Super Contributor
timestamp: December 09, 2018, 09:58:45 am
content: Adding an extra capacitor of 100uf or so will probably dampen the overshoot. What is more important are overshoots when powering on and off. If the PSU doesn't have a real power switch, then plugging in the mains counts as power-on.
Keysight DSOX2014A not setting one of the defaults - Page 1
Forum section: electronics / testgear

author: bicycleguy
author_rank: Frequent Contributor
timestamp: December 09, 2018, 10:53:51 pm
content: For some reason lately, pressing the 'Default Setup' button sets the Horz to 100ns/div instead of 100us/div. This is not usually helpful.I think this is a new development. All the rest of the defaults seems to reset as expected. Anyone know if there is a file I can change that might fix it. I have the Lan card. Did the options hack ~year ago and thought about cluttering that thread but I think this is a new behavior.Wondered if anyone else sees this.edited: changed title
implementing relay for current protection in multimeter  - Page 1
Forum section: electronics / testgear

author: hussamaldean
author_rank: Unknown
timestamp: December 09, 2018, 02:00:17 pm
content: Hi all,I got this crazy idea while I was in the shower (the best place to think though) is that why not using relay for input protection in the current range of the multimeter which will not be active unless the current range is selected and the probe in the right place!!I think this idea will increase the safety level of the current range or just crazy idea I have like other ideas which leads always to a catastropheregardslooking forward to ur answers

author: 001
author_rank: Super Contributor
timestamp: December 09, 2018, 03:47:22 pm
content: relays are too slowsome analog meters has two diodes across shunt to protect meterdiodes actually limits voltage drop below 0.6V

author: Jeroen3
author_rank: Super Contributor
timestamp: December 09, 2018, 03:57:09 pm
content: Your typical Fluke 87V would need a 1000V relay, capable of 10 Amps, and breaking capacity for CAT IV, with a consistent contact resistance.Those are very specific. Economically not very feasible.Instead, just use the operator as relay, wiring it correctly. Or use the simple technology from Gossen Metrawatt, only exposing the terminals for the configuration the meter is currently in.

author: HKJ
author_rank: Super Contributor
timestamp: December 09, 2018, 05:45:43 pm
content: What about current consumption?The Siglent bench multimeter do this, it will automatic change to higher range when a current range is overloaded, also if manual range is selected. I doubt it works if you are in AC current and apply DC current or vice versa.

author: tautech
author_rank: Super Contributor
timestamp: December 09, 2018, 06:44:45 pm
content: Quote from: HKJ on December 09, 2018, 05:45:43 pmIt's only switching the measurement pick-off point from the shunts for different range resolution.
Looking for a cheap handheld two channel signal generator - Page 1
Forum section: electronics / testgear

author: Magnum
author_rank: Regular Contributor
timestamp: December 08, 2018, 02:58:17 pm
content: Hello,I am looking for a handheld sine wave signal generator with two channels. Frequency up to 100kHz, amplitude up to 20V, accuracy 0.1%.On ebay I found this one:https://www.ebay.com/itm/JDS2062A-Handheld-30MHz-2-Ch-Digital-Signal-Generator-Frequency-Meter-S4R2-SPS/264072167443?hash=item3d7bed8013:m:mX4GDDtJy3SGnrlW3X8wVUQ:rk:1:pf:0It does everything I need and the price is right. Does someone have one of them or can recommend something else?Thanks.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 08, 2018, 05:24:43 pm
content: oh nice, never saw theses.

author: ciccio
author_rank: Frequent Contributor
timestamp: December 08, 2018, 06:09:48 pm
content: Interesting. I see that maximum output level value is not specified. Are you sure it is 20V?Best regards

author: ledtester
author_rank: Super Contributor
timestamp: December 08, 2018, 07:08:01 pm
content: In the specs listed at the bottom of the ebay listing:Code:Specifications:Model: JDS2062A...Output Signal Amplitude Range: ≤5MHz (2mV - 20V),≥5MHz≤10MHz (2mV - 10V), ≥10MHz≤30MHz (2mV - 5V)...

author: danco
author_rank: Newbie
timestamp: December 08, 2018, 08:15:06 pm
content: How about Feeltech 6600/6800? It's bench top version, but small enough to be taken away. No battery opperation for that maner though.Sent from my MI 5s Plus using Tapatalk

author: Magnum
author_rank: Regular Contributor
timestamp: December 09, 2018, 01:21:12 pm
content: The Feeltech looks interesting, but I need battery operation. I think I'll order a JDS2062A from China and see what I get.
Low Cost eBay Tracking Generator? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: December 09, 2018, 05:01:23 am
content: Anyone have any experience or thoughts on one of these? Thxhttps://www.ebay.com/itm/HP8590A-HP8591-HP8565A-HP8568A-HP8569B-Spectrum-Analyzer-Track-Source-Generator/253690266561?hash=item3b111e43c1:g:ooUAAOSw2Ehanrqs:rk:191:pf:0
Which differential probe? - Page 1
Forum section: electronics / testgear

author: Housedad
author_rank: Frequent Contributor
timestamp: December 07, 2018, 07:18:26 pm
content: I have been looking at getting the MSIG DP10013 (130/1300v) differential probe and want to make darn sure that it is sufficient for my needs, so I am asking about it here. Cost is a issue right now, and what I do is all Hobby level, so $150 or so is the max limit.The highest voltages that I expect to ever see would be on Tube radio sets like a AA5 or AA6, or the output of a VFD drive (240V 3ph).Do you think the DP10013 is sufficient for this or should I get a DP20003 (560/5600V) unit later for those uses? Anything else I will be doing is mostly lower voltage and power.I guess I should throw in that I may work on the occasional solid state (70's-80's) stereos.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: December 07, 2018, 09:02:05 pm
content: Unless you have a specific need, I would go with the DP10013: don't forget you're going to be loosing out on the bottom end with a 200x rather than 50x probe. That is to say a 0.1V signal becomes a 2mV. How well does your oscilloscope do down there?EDIT: Off by an order of magnitude...

author: boB
author_rank: Frequent Contributor
timestamp: December 07, 2018, 09:22:04 pm
content: The lowest price I find for the Micsig probes are $142 plus shipping of course.Works well. I HAVE had two of them give me an output offset that I can't fix. Have been talking with the seller about that.Hopefully we can get that taken care of but good probes in general especially for the price.

author: Housedad
author_rank: Frequent Contributor
timestamp: December 08, 2018, 04:09:45 am
content: Thanks for the input. I dropped the hint (text) to my wife for Xmas for the DP10013. She's been looking for something to give me. We'll see if this suits her fancy for a present.
Which scope probes? - Page 1
Forum section: electronics / testgear

author: TimeBandit
author_rank: Regular Contributor
timestamp: December 08, 2018, 03:44:28 pm
content: I have a Tektronix 2336 (100 MHz) that I currently use with a set of Hantek 200MHz probes. I'm happy with the Hantek's, but I can pick up a set of Tektronix P6105's for very cheap. Any reason to bother with the Tek's?

author: nctnico
author_rank: Super Contributor
timestamp: December 08, 2018, 07:20:10 pm
content: Quote from: TimeBandit on December 08, 2018, 03:44:28 pmIf those probes are used then don't bother. Used probes are like used underwear. You don't know what happened to them...

author: markce
author_rank: Regular Contributor
timestamp: December 08, 2018, 10:44:04 pm
content: P6105 probes have a coding pin for the 10x attenuation. Digital readout of the 2236 makes use of this to scale the readout. So yes, unless you disabled the coding on the 2236, they are a nice upgrade.

author: TimeBandit
author_rank: Regular Contributor
timestamp: December 09, 2018, 10:58:36 pm
content: I have the 2336 (not the 2236), and I don't believe it had the coding capability.

author: markce
author_rank: Regular Contributor
timestamp: December 09, 2018, 11:42:38 pm
content: Must have misread the scope type no. Tek 2336 doesn't have a buildin dvm, so no coding pin contact.
A look inside an Iwatsu SS-8740 (LeCroy LA314) 400MHz Analog 'scope - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: December 06, 2018, 03:32:22 pm
content: I just got a new to me Iwatsu SS-7840 (aka LeCroy LA314) from an auction here in UK. It seems a nicely put together 'scope designed to compete with the Tektronix 2456B.As they say don't turn it on, take it apart!Power supply, HV, Horizontal and Z-AxisDetail of conformal coated sub-board in PSUVertical board plus detail of CRT termination - can anyone give me any idea what the wire stub on one side of the termination is for - my guess is that it has something to do with the bandwidth variant that goes to 470MHz?CPU board (lower left) and main board with delay line (lower right)I was amazed to find that the CR2354 backup battery soldered to the CPU board in 1997 still has a good charge on it!Now if only I can find an IE-1066 Adjustment Jig (calibration fixture) to go with it!Dave

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 06, 2018, 04:28:07 pm
content: Neat! So Japanese... Thanks for sharing.Did you get that blue CRT filter off in the end?

author: BravoV
author_rank: Super Contributor
timestamp: December 06, 2018, 05:03:58 pm
content: Really nice Dave, what a score !Thanks for sharing the teardown photos, loved how you picked few detail close up spots.Quote from: perdrix on December 06, 2018, 03:32:22 pmHonestly, even though I own a Tek 2465B, this SS-7840 is one of my dream scope too, I guess I'm too greedy.

author: nctnico
author_rank: Super Contributor
timestamp: December 06, 2018, 05:48:55 pm
content: I used to own one of these. Very nice analog scopes but I wish it had a full set of attenuators on all channels.

author: guido
author_rank: Regular Contributor
timestamp: December 06, 2018, 06:44:37 pm
content: I have a 7810. The manual contains the schematic for the IE 1066 (electrotanya has the manual). It is just some logic, opamps and a very early audio DAC with parallel inputs, a PCM55.You can also use a PCM54, which is what i didWorks great, apart from the buzzer. Never got round to figure out what is wrong there

author: dzseki
author_rank: Frequent Contributor
timestamp: December 06, 2018, 10:44:18 pm
content: Very nice! The V amplifier looks rather effortless for 400MHz performance, at least compared to my HP 1720A's.The brochure I saw mentioned 470MHz only in certain V/div setting for the SS-8740H, for the rest "only" 440MHz, so it might be more like an input related thing, or cherry picking some key components.

author: perdrix
author_rank: Frequent Contributor
timestamp: December 07, 2018, 06:06:34 am
content: Hi GuidoI'm assuming that you built that yourself? If so do you have any spare boards? Or would you share the Gerber files?ThanksDavid

author: guido
author_rank: Regular Contributor
timestamp: December 07, 2018, 09:43:12 am
content: Hi,Yes. No. Yes. Contact me offline
HP-8591E video issue - Page 1
Forum section: electronics / testgear

author: lu8egb
author_rank: Newbie
timestamp: December 06, 2018, 08:06:51 pm
content: Hi everybody,I wanted to ask about the HP-8591E analyzer to the HP experts.Someone offered me this analyzer -mint condition indeed- that apparently has a video problem (I think).I have had the opportunity to see the rig only a few minutes. I´ll try to describe the issue.The equipment turn-on ok and accepts all the parameters of amplitude, span or frequency that are entered. However, at 3 or 4 seconds after switching on, the entire grassline "goes up" and it endeed compressed as a single line you can see at the top of the display, so that it is not possible to run any diagnostic routine.After that, I was reading the service guide at assembly level repair to arrive at an indicative conclusion. There is some examples of common troubleshooting video problems, but not this case. I can see the video is processed at A16 module.Any guideline or comments will be appreciated.Thanks for watching.
Tektronix 2465A - Page 1
Forum section: electronics / testgear

author: stfjohn
author_rank: Regular Contributor
timestamp: December 06, 2018, 04:54:58 pm
content: Hi everyone. My Tek 2465A suddenly showed the following problem: at power up the message "TEST 04 fail 13 <017F> appears. I tried to replace the microprocessor, the ROM and also the RAM (also the battery), but nothing changes. By moving pin 501 to "CAL", and trying to calibrate the device, the procedure does not work: simply the device checks the various tests, reconfirming the FAIL to test No. 04! Can anyone help me please? Thanks.
White ring arond the outside of the red + jack on the 87v... Anyone know why? - Page 1
Forum section: electronics / testgear

author: Terry01
author_rank: Frequent Contributor
timestamp: December 05, 2018, 10:58:23 am
content: I just bought a new 87v and have noticed it has a white ring around the outside of the red + jack. Does anyone know why this is? I have never seen this before.

author: JackJones
author_rank: Regular Contributor
timestamp: December 05, 2018, 11:27:54 am
content: I've noticed it too in pictures. I just thought it's cosmetic.Unless it glows in the dark for nigh time probing.

author: Terry01
author_rank: Frequent Contributor
timestamp: December 05, 2018, 11:55:30 am
content: Quote from: JackJones on December 05, 2018, 11:27:54 amNice idea there buddy but no it's night time glowing.I think bd139 may be correct and it's some way to identify the marketing or of where it was made or something like that. I'm sure someone here will know and i'll find out soon enough.Thanks for the idea all the same.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 05, 2018, 12:31:25 pm
content: Quote from: Terry01 on December 05, 2018, 10:58:23 amI suspect this is because of the color of plastic that was used.There have been a couple of threads about it. Try using "Fluke 87V color grey" and such in the advanced search. Here is one hit:https://www.eevblog.com/forum/testgear/fluke-87v-(2017)-lacking-quality-control/100/

author: Terry01
author_rank: Frequent Contributor
timestamp: December 05, 2018, 01:15:59 pm
content: So I have this puppy cracked all the way open. Is there anywhere on it that will let me know if it's USA made or Chinese put together?

author: Fungus
author_rank: Super Contributor
timestamp: December 05, 2018, 02:15:50 pm
content: Quote from: Terry01 on December 05, 2018, 01:15:59 pmIt usually has that info on the sticker on the box.

author: Terry01
author_rank: Frequent Contributor
timestamp: December 05, 2018, 04:59:35 pm
content: Quote from: Fungus on December 05, 2018, 02:15:50 pmWell spotted!! LOL

author: Shock
author_rank: Super Contributor
timestamp: December 06, 2018, 04:06:54 pm
content: Quote from: Terry01 on December 05, 2018, 01:15:59 pmMany USA made Fluke models will have it printed on the rear plastics.
Hameg HM 203-5 manual in English anyone ? - Page 1
Forum section: electronics / testgear

author: elettroluis
author_rank: Contributor
timestamp: December 06, 2018, 01:44:34 pm
content: Hi, I have an Hameg HM 203-5.I have downloaded the manual in German, which I don't speak, and for this reason I would like an English copy.I have found online the English manual in PDF for the 203-4 and 203-6, but only the German one for the 203-5.I know the manual exists in English because I saw a physical copy for sale on Ebay, but the manual + shipping is going to cost me 20 euro or half the price I paid for the whole scope, I find it a little extreme.So, I thought maybe someone here may help.I don't "need" it, the scope is easy to use and the other two versions I found online are close enough, but I would like it anyway.Thanks.
EEVblog 10% discount for Members for Rohde and Schwarz  - Page 1
Forum section: electronics / testgear

author: tequipment
author_rank: Regular Contributor
timestamp: December 04, 2018, 08:48:54 pm
content: I wanted to let everyone know we now have a 10% off code for eevblog members on all Rohde and Schwarz equipment. Please PM us for the code.Best Regards,Evan CirelliVice President and Co-FounderTEquipment.NETInterWorld Highway, LLC

author: TheDeuceII
author_rank: Newbie
timestamp: December 07, 2018, 02:01:34 am
content: Quote from: tequipment on December 04, 2018, 08:48:54 pmJust a heads up: I received a marketing email from TEquipment.NET this morningcontainingthe discount code. After seeing the post, I wasn't sure if it was intentional or not. Figured I'd bring it to your attention if, by chance, it's the latter.-Deuce

author: maginnovision
author_rank: Super Contributor
timestamp: December 07, 2018, 02:33:14 am
content: I suspect interest here wasn't as strong as anticipated. I personally plan on picking up an hmc8012 about 20 minutes after my kids open their christmas presents.
AC Isolation Monitor - Page 1
Forum section: electronics / testgear

author: dtryon
author_rank: Newbie
timestamp: December 04, 2018, 12:56:19 pm
content: Hey Folks,I have tried to look but I can't find anything like I'm looking for. What I need is a circuit or kit or PC board design that will monitor AC line isolation. I need this to operate on a continuous basis. I want to monitor test equipment and or equipment under test so it remains isolated while being worked on. I would think someone has already designed something to do this function. I don't want to reinvent the wheel, lol.Can anyone help me with this problem?Thanks,Dennis

author: helius
author_rank: Super Contributor
timestamp: December 04, 2018, 01:16:35 pm
content: An isolation test is "just" a resistance reading. Unfortunately, to test the resistance between two circuits requires a galvanic connection between them, which itself is not isolated. I don't think the monitoring device you envision is physically possible.

author: 001
author_rank: Super Contributor
timestamp: December 04, 2018, 10:18:17 pm
content: Quote from: dtryon on December 04, 2018, 12:56:19 pmSupply Current = Load Current+ Leakage Current (if isolation is bad)So Your bicycle is common leakage relay

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: December 05, 2018, 12:44:31 am
content: Look here:https://www.bender.de/en/know-how/technology/it-system/insulation-monitoringBender is the most original name for those, as they have pioneered this technology. They are represented directly or indirectly quite everywhere.But other major electrical brands have their own versions. If the form factor (35mm rail and screw terminals mostly as usual in industrial applications) doesn't fit you, get the circuit boards out and modify them.That is of course easier with the older models, the UI of which consisted of some LEDs, Pushbuttons/Switches and potentiometers/trimmers. Set the trimmers, replace annunciators and inceptors by optocouplers or whatever, and you can integrate the functionality discreetly into something.

author: David Hess
author_rank: Super Contributor
timestamp: December 05, 2018, 01:41:18 pm
content: Check out how theTektronix A6901 Ground Isolation Monitorworked.
PC software for Agilent/Keysight PXT E6621A - Page 1
Forum section: electronics / testgear

author: andre_p
author_rank: Newbie
timestamp: December 03, 2018, 09:27:45 pm
content: Hey,I am looking for PC software for the above-mentioned device, an Agilent/Keysight PXT E6621A. Unfortunately, the device is discontinued and Keysight support is unable/unwilling to issue a license for the software. Specifically, I am looking into the PC message logging software as well as into the VNA (89600B VSA Software) and LTE conformance testing software (option N6072A and others). Any pointer would be highly appreciated.CheersAndre

author: tmbinc
author_rank: Frequent Contributor
timestamp: December 03, 2018, 11:32:44 pm
content: I only have the standard software for the device (Version 6.5.1.3?), and you probably have seen FixE6621A.zip. I also don't have the PC message logging software, and at some point I started to reverse-engineer the UDP protocol but didn't get very far. It seems there's extensive parsing involved to get this into the Wireshark format that's for example used on the E7515A.Support for the E6621A was dropped in a certain 89600B version unfortunately.And of course it required to run this "translator app" which I also never had.Sorry - can't really help you, but I'd be very curious if you can find anything.

author: andre_p
author_rank: Newbie
timestamp: December 04, 2018, 03:58:48 pm
content: Yeah, I also have Version 6.5.1.3 installed on the device. I didn't know about the FixE6621A.zip but looks like it's only needed if its in an unusable. Mine is working fine so far. Yeah, having the UXM logging working, i.e. the WIreshark disector would be good but I don't think its straightforward. The disector is open-source though. But I'd prefer to just use the test equipment and develop the device under test instead of developing the tester first. We keep looking then I suppose ..
"Almost" vintage gear - Introduction to the Sinadder 3 - Page 1
Forum section: electronics / testgear

author: w2aew
author_rank: Super Contributor
timestamp: December 03, 2018, 02:55:04 am
content: My latest video introduces the venerable Sinadder 3 - a very useful bit of service test gear aimed towards receiver alignment tasks. In addition to being an audio AC voltmeter, it can also directly measure SINAD (signal to noise and distortion) - which is a very common measurement related to FM receiver alignment and sensitivity characterization.

author: graybeard
author_rank: Frequent Contributor
timestamp: December 03, 2018, 10:39:58 pm
content: Thank you for another excellent video. Your explanation is simple, clear, and concise. Your demonstration is also simple and to the point.I think you produce the best electronics videos on the web. I discovered you after I designed a on-chip diode storage time test cell for GaAs PINs and I was looking for some supporting links to include in a presentation. I then came across your discrete diode storage time video and have guided many of my colleagues to it.My favorites of your videos are 274, 275, 141, 195, 88, 122, 111, 118, & 276I'm jealous of the nice TEK gear you get to play with at home, but that is probably a perk of your job. I have a 7904, some 500 series meters and signal generators, and a 575 curve tracer.Keep up the excellent work. I truly appreciate your videos.

author: w2aew
author_rank: Super Contributor
timestamp: December 04, 2018, 01:08:23 am
content: Quote from: graybeard on December 03, 2018, 10:39:58 pmThanks for your kind words - I'm happy to know that you enjoy my videos. Yes, being a Tek FAE has its perks - but most of the equipment you see in my basement lab is my own equipment. Be sure to let me know if there's a topic you'd like to see in a future video.You probably already know that I do maintain an index of all of my videos, which can be found here:https://www.qsl.net/w2aew/youtube/W2AEW_video_index.pdfIt's arranged numerically as well as by topic.Alan

author: cdev
author_rank: Super Contributor
timestamp: December 04, 2018, 02:13:18 am
content: Alan,I very much enjoy your videos.Do you know where I can get theservicemanual for the not-so-common Tek 2211?I have one and I am hoping to be able to keep it going for another couple of years because its just a very nice scope that I still have not outgrown.Thank you for all the insights you have shared!

author: w2aew
author_rank: Super Contributor
timestamp: December 04, 2018, 02:33:44 am
content: Quote from: cdev on December 04, 2018, 02:13:18 amI don’t know that I’ve ever seen that service manual on any of the free repositories. There is a scanned copy available from ArtekMedia that is offered on eBay.

author: 0culus
author_rank: Super Contributor
timestamp: December 04, 2018, 06:07:42 am
content: Wow, that's a neat little instrument. Big fan of your channel! Your early videos about the ins and outs of analog Tek scopes really helped me learn a lot about my 2465B!
What is the best tube tester (not curve tracer)? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: November 30, 2018, 10:37:14 am
content: What is the best tube tester (not curve tracer)?YeaI mean oldschool box full of tube panels and big analog meter in the center

author: rf-loop
author_rank: Super Contributor
timestamp: November 30, 2018, 12:29:42 pm
content: One very good is AVO VCM163.What is absolutely best - who knows.How to define and tell what is best in general. My opinion is that it is impossible. Which is perhaps best for some purpose for some user, that is another matter. What is best car, what is best bicycle, what is best oscilloscope, what best spectrum analyzer and so on, what is best banana... no one know.Tens of years ago my son ask lot of this kind of questions.

author: Chris56000
author_rank: Frequent Contributor
timestamp: December 03, 2018, 09:25:05 pm
content: Hi!The AVO VCM163 Valve Characteristic Meter, to give it it's official name, was the "Rolls Royce" of valve testers/evaluators, but it suffers from many problems with the large numbers of multi–contact rotary switches, and it's meter movement is horrendously scarce and difficult to obtain!The UK's Vintage Radio Discussion and Restoration Forum deals at length with this instrument and has manuals, but personally I would make a new Valve Tester right from the ground up, and to this end I whole–heartedly recommend you consider building the talented late Mike Rowe's "Sussex" V.T. design – all parts are readily available, and you can get a specially made mains transformer to order – the UK Forum has all the details!I am about to embark on building a "Sussex" Valve Tester for myself!Chris WilliamsThe UK Vintage Radio Forum has a full Construction & Operation Manual for the Sussex V.T., I'd download a copy and have a perusal through it first!The stratospheric prices now being asked for Avo, Mullard and Taylor Valve testers has completely put me off attempting to buy and restore one – they're well into four figures now!!

author: graybeard
author_rank: Frequent Contributor
timestamp: December 03, 2018, 10:20:10 pm
content: Any of the old Military ones are great. I have a TV-3C/U, the TV-10 is the latest one. The tube test setting are compatible.
Owon PDS 6062T scope that acts in peculiar way. - Page 1
Forum section: electronics / testgear

author: Peter_A
author_rank: Newbie
timestamp: December 02, 2018, 08:13:27 pm
content: I recently got an Owon PDS 6062T scope of eBay for 150€. I bought it as a defective unit, didn't really know what was wrong with it, but on the pictures it looked fine. It came with the original box and still had the wrap protecting the screen on, but sure enough it was defective. The problem with it is, that you cannot adjust its vertical position, it's stuck at a certain level and that level changes when you change the vertical scale (volts per division). As can be seen in the following videos (excuse me for fumbling around, I’m not used to this scope).https://streamable.com/0ennghttps://streamable.com/xhl73Interestingly though, the problem goes away in single shot capture mode:https://streamable.com/5389cHas anybody encountered anything similar before? I haven't got the faintest idea what could be causing it to act this way.Otherwise the thing isn't built all that well, the screen is kind of dim, and the user interface as well as some design cues are ripped off from the Tektronix scopes, but it would make a nice, cheap and simple carry around scope, since it can operate of a battery.A teardown will ofcourse follow if anybody wishes to see it.

author: Performa01
author_rank: Super Contributor
timestamp: December 02, 2018, 10:16:20 pm
content: Single Shot = Stop mode --> positioning the trace in Stop mode is just a graphical task within the screen buffer, hence software only.Normal Trigger = Run Mode --> now the position control has to add a real DC offset voltage to the input signal, this is very different.So it looks like there's a Problem with the internal position offset voltage generation/application. Could be the offset DAC or one of the OpAmps - there could be one for the DC input path and another one as a DAC output buffer. Of course also any other associated components/connections.

author: Hydrawerk
author_rank: Super Contributor
timestamp: December 02, 2018, 10:24:58 pm
content: This scope is really basic.