hybridfree/eevblog-posts huggingface dataset:
Re: ANENG 8008 mod for faster more accurate readings. - Page 1
Forum section: electronics / testgear

author: wilfred
author_rank: Super Contributor
timestamp: June 05, 2019, 05:47:56 am
content: #ANENGMODI found this blog post whilst searching for failed backlights on this meter. It tackles noise spikes on the supply with more and better (lower ESR) capacitor.https://www.jackenhack.com/aneng-an8008-modify-for-better-accuracy-faster-readings/Has anyone here tried it or got some thoughts about how effective it might be?Known backlight issues would help too.

author: floobydust
author_rank: Super Contributor
timestamp: June 05, 2019, 06:09:31 am
content: I figured out the AN8008 cap mod inJuly 2017,so a few people later posted it in their blogs.Adding 3VDC rail ceramic capacitors is a huge improvement in settling time and stability for readings.Without them, the noisy 3V rail causes the averaging algorithm to take longer or simply never settle down so the last digit is always moving around.I've had no hassles with the LED backlight.

author: wilfred
author_rank: Super Contributor
timestamp: June 05, 2019, 06:26:55 am
content: Sorry @Floobydust I did do a search for prior threads but obviously I missed your post. The title wasn't any indication of modding the thing.Here's another link to it for future seekers.https://www.eevblog.com/forum/testgear/an8008-us-$19-10000count-1uv-0-01ua-0-01ohm-resolution-meter/msg1261300/#msg1261300Thanks.#ANENGMOD
E36200 Series 200W/400W DC Power Supplies (E36231A, E36232A, E36233A, E36234A) - Page 1
Forum section: electronics / testgear

author: JxR
author_rank: Unknown
timestamp: June 04, 2019, 06:18:06 pm
content: E36231A 200W Single Output Autoranging Power Supply: 30V, 20A US$ 1,590E36232A 200W Single Output Autoranging Power Supply: 60V, 10A US$ 1,590E36233A 400W Dual Output Autoranging Power Supply: 2x 30V, 20A US$ 2,765E36234A 400W Dual Output Autoranging Power Supply: 2x 60V, 10A US$ 2,765These supplies come in the same form factor as the lower powered E36300 series. They also appear to be nearly identical in operation.E36200 Series Product PageE36200 Series Programmable DC Power Supplies Data Sheethttps://literature.cdn.keysight.com/litweb/pdf/5992-3747EN.pdfE36200 Series Programmable DC Power Supplies Product Fact Sheethttps://literature.cdn.keysight.com/litweb/pdf/5992-3773EN.pdfE36200 Series Programmable DC Power Supplies User Guidehttps://literature.cdn.keysight.com/litweb/pdf/E36200-90001.pdfWhile these are now officially shown on Keysight's website,they still do not appear to be available yet.TestEquity and Jenson show stock on a couple I checked, so looks like you can buy one now for all your 10V@40A needs....I also contacted Keysight to get clarification on the new unit's standby power, as well as ask them if there are any transients on the outputs when connected to mains.They provided a fairly detailed response that I will share:From Keysight:@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@As for the new E36200A series, the power consumption info is below.Standby Mode:200W models - 9 - 10W400W models - 13-15WPower on Mode:200W models - 20W300W models - 30WAlso the power on spike/transient only happened on E36300A series which have been fixed in all the latest production unit.The E36200 does NOT have this issue.@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Tektronix new 3 series and 4 series MDO - Page 1
Forum section: electronics / testgear

author: udhay_cit
author_rank: Contributor
timestamp: June 04, 2019, 05:44:36 am
content: Surprise... Tektronix launches two new series oscilloscopes.https://www.tek.com/innovative-scopesDatasheethttps://www.tek.com/datasheet/3-series-mdohttps://www.tek.com/datasheet/4-series-mso

author: djnz
author_rank: Regular Contributor
timestamp: June 04, 2019, 06:44:33 am
content: https://www.eevblog.com/forum/testgear/new-tektronix-3-series-mdo/https://www.eevblog.com/forum/testgear/tektronix-new-scope-june-4th!/
DMM Tektronix DM5010 - Page 1
Forum section: electronics / testgear

author: frantisek
author_rank: Regular Contributor
timestamp: May 31, 2019, 06:51:35 pm
content: Greetings. Does anyone have experience repairing DMM Tektronix DM5010? I have an error 311 ... Thank you!

author: anotherlin
author_rank: Frequent Contributor
timestamp: May 31, 2019, 11:10:33 pm
content: Quote from: frantisek on May 31, 2019, 06:51:35 pmTryhttp://w140.com/tekwiki/wiki/DM5010The user manual should have a description of the error code with full schematic.I had one with a leaking battery, just changed it and it works. But it requires calibration (data lost with battery).Manual states that error 311 is converter time-out.However, maybe you should check the voltage of the battery anyway.It may be because the calibration data is bad that you have the converter timing out.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 01, 2019, 07:44:40 am
content: The ADC seems to be a special chip. So if there is really something wrong in the ADC chances are not that good. I somewhat doubt that bad cal data would cause this error. It is more like a wrong input signal (too large, e.g. due to bad amplifier/switch) or a missing reference or similar. Just a bad contact / seating problem in a socket is another candidate.The manual includes schematics and descriptions. The good old times when there was a theory of operation section.

author: frantisek
author_rank: Regular Contributor
timestamp: June 01, 2019, 04:39:19 pm
content: Of course, the batteries are replaced. The instrument can be switched to calibration mode, CAL appears on the display, but 311 again flashes when attempting to enter a value.

author: anotherlin
author_rank: Frequent Contributor
timestamp: June 02, 2019, 09:24:07 am
content: Quote from: frantisek on June 01, 2019, 04:39:19 pmOuch, then it won't be an easy fix.The suspect would indeed be the integrating ADC.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 02, 2019, 11:13:53 am
content: The unit uses quite a large number of opto-couplers. Early opto's had a tendency to fail with to low CTR. So there are few more points to check before giving up.
Unisource DM-1150B Multimeter 0 info Online? - Page 1
Forum section: electronics / testgear

author: Amsoily
author_rank: Newbie
timestamp: June 05, 2019, 09:18:38 am
content: Summary,HP / Agilent 34401A and/or Fluke 87v. For my purposes, owning both is the best option (Continuity)Thank you for providing a forum to gather information and take notes.Speacial thanks to: vcsiii50Just tell me what you think ofhttps://www.tequipment.net/unisource/multimeters/Vici and other Chinese model changing many names on same device. $84 to $145 USD depending on model at one peice.Rest are notes and comments.From what I can see, if you can get old meters in good shape with AC and GPIB options then pretty cool. Other than that, best thing to do is save for a bit longer and get a Rigol DM3058E vs agilent 34401a***Hello,Trying to decide between a Fluke 8840a with AC option, Fluke 8842a and Instek GDM-8251A .Then I came across Unisource DM-1150B.The first three have plenty of information and reviews, the Unisource has 0 info in forums and online but did find one reveiw on a Unisource dm-1140b on Amazon.The 1140b looks to just have manual range.Anyhow, I can choose one bench multimeter, it will be my only one and it will be my only one for a very long time.Thank you,Any and all advice is highly appreciated.VC8145 looks the builders. Unisource is Vici renamed or other way around.Well, do I go for old Fluke or the most expensive one on this page:https://www.tequipment.net/unisource/multimeters/?**Well just read no continuity on the Flukes.Not looking for lab test. Looking for service tech bench.**Agilent branded 34401APicotest M3510A**keithley 2110
How to protect input of a cheap logic analyzer? - Page 1
Forum section: electronics / testgear

author: Chriss
author_rank: Frequent Contributor
timestamp: June 01, 2019, 04:23:51 pm
content: Hi!I got a cheap logic analyzer from ebay.https://www.ebay.com/itm/USB-Logic-Analyzer-Device-Set-Compatible-to-Saleae-24MHz-8CH-for-ARM-FPGA-M100-/132431128540?txnId=1575823275003When I opened it I saw there is no prptection of the inputs.I'm interested to mod my device with some simple protection. Let's say I connect a source of 12-15v and I wish to monitor some sources where are some solenoids connected.I'm thinking to put some resistor in serial of the input let's say around 10k and maybe a esd protective diode...Can somebody share some ide or maybe a circuit diagram?Thank you.Sent from my SM-J500F using Tapatalk

author: ebclr
author_rank: Super Contributor
timestamp: June 01, 2019, 04:35:32 pm
content: Optocoupler is your solution

author: schmitt trigger
author_rank: Super Contributor
timestamp: June 01, 2019, 04:41:12 pm
content: Have you considered TVS arrays like this one?https://www.mouser.com/datasheet/2/54/CDNBS16-T03_T36C-69148.pdf

author: Chriss
author_rank: Frequent Contributor
timestamp: June 01, 2019, 04:41:47 pm
content: Thanks for the reply.Can you prefer winch optocoupler to use pls.?Sent from my SM-J500F using Tapatalk

author: Gyro
author_rank: Super Contributor
timestamp: June 01, 2019, 04:44:39 pm
content: Quote from: ebclr on June 01, 2019, 04:35:32 pmNot if you want 8 channels at 24MHz (at least without costing a lot more than the LA).

author: Chriss
author_rank: Frequent Contributor
timestamp: June 01, 2019, 04:58:31 pm
content: Hmmm this tvs array is very i teresting.My mayor goal is to investigate L/H signal on car fuel injectors.Would this tvs arrays be a good protection for this purpose?Maybe also to monitor and record the signal on the primary low voltag side of the ignition coil etc.?Sent from my SM-J500F using Tapatalk
MSO-X-2012A - Page 1
Forum section: electronics / testgear

author: Thedon
author_rank: Contributor
timestamp: June 01, 2019, 05:12:30 am
content: Does anybody know if it is possible to install the frequency response analyser (Bode plot) on a MSO-2012A currently doing it the hard way saving wave forms as .CSV files then importing them into Matlab? I purchased mine back in 2012, I have noticed that Keysight is offering 1000X series with this option does it require a firmware upgrade? Does Bench Vue have this capability which I'm reluctant to install as I did install it back in 2013 but it turned out to be bloatware and caused numerous issues with the computer. Or is it not possible as it requires a hardware upgrade? Thanks in advance.

author: Someone
author_rank: Super Contributor
timestamp: June 01, 2019, 07:38:50 am
content: Grab a raspberry pi and do it for cheaper:https://www.eevblog.com/forum/testgear/faster-fra-from-scope-by-external-control-over-visa/
L&N 9828 DC null detector - Page 1
Forum section: electronics / testgear

author: maginnovision
author_rank: Super Contributor
timestamp: May 31, 2019, 10:24:49 pm
content: I'll update with pictures later butI bought one of these and it appears to work but I can't quite get it to zero on the 2.5uV range. Has anybody seen one of these, or a service manual?In these pictures you can see pretty much all there is. The large metal box near it is the external case, and there is also a top part for the shielded compartments. The entire compartmentalized area is completely isolated from the case. The case is grounded and the isolated bit is connected to guard. While replacing the old non-shielded cable with a new shielded PTFE cable I knocked ALL of the insulators from under the guarded compartment. Had to take most of the thing apart to get those back in and all of it together so it's still pretty dirty since I ran out of time for tonight.

author: maginnovision
author_rank: Super Contributor
timestamp: June 01, 2019, 05:23:38 am
content: Some more pictures. Inside the large metal box in the first picture is just a couple of transformers with some capacitors across them.

author: maginnovision
author_rank: Super Contributor
timestamp: June 01, 2019, 05:24:12 am
content: Last ones

author: Vgkid
author_rank: Super Contributor
timestamp: June 01, 2019, 03:17:57 pm
content: Interesting, looks like a stripped down version of my 4271.

author: maginnovision
author_rank: Super Contributor
timestamp: June 01, 2019, 06:24:58 pm
content: They're definitely similar. After replacing the stock input cable and reassembling the thing it seems a bit better. If I pick the cable up off of the unit the needle does go to zero on 2.5uV range. If I let the cable swing so does the needle. This is all open circuit though. No guard, no ground and no input voltage.At this point I've finished making the cable and hooking it up. For operation... You select the range you want and you can slowly turn the middle knob to CAL, once it's there the full scale is the range selected. Until it's at CAL the range is amplified to some degree, with no marking I'm not sure but it seems drastic. I still don't know what the Zero knob or the open circuit pot do. On my unit they have zero effect regardless of any knob settings, or if the cable is connected to anything, shorted, whatever. So it does seem to have some issue(s) still.EDIT 8/28/2020: I'm hoping this doesn't necro the thread but I did find that the only issue was a dead battery. I'm not sure what the original battery chemistry or type was but I replaced it with a simple AA battery. It allows zero'ing to be done and it seems very stable over time. Not temperature though. I'm going to replace the alkaline with a lithium AA battery and retest. Also compared to a Keithley 155 they drift the same amount but opposite directions when shorted(Keithley goes - and L&N goes +)
Difference between channels in vertical measurement MSO5074 - Page 1
Forum section: electronics / testgear

author: Magnum
author_rank: Regular Contributor
timestamp: May 31, 2019, 08:36:09 pm
content: Hi,received a MSO5074 today. A stupid question: Feeding a 4Vpp Square Wave to all channels (one after the other), the DVM reads between 2.00 and 2.04 V RMS. Also visible on the waves. I know that DSOs are not very accurate in vertical measurements, but I did not expect differences between the channels. Is that normal or a calibration problem? I have firmware 00.01.04.04 which seems to have problems with autocal.

author: Magnum
author_rank: Regular Contributor
timestamp: May 31, 2019, 08:43:18 pm
content: Just found out it seems to be normal. When resizing the wave form a bit (with fine controls) it goes up and down on all channels about 0.03V. But still within the stated 3% accuracy.

author: thm_w
author_rank: Super Contributor
timestamp: May 31, 2019, 11:21:48 pm
content: Yeah thats fine as you said.4Vpp would likely imply a 1V/div setting on the vertical scale or more (8*1V visible on the screen, 10V total). 3% of 10V is 300mV.You can try running calibration if you like, see if it makes any difference.
Mestek DM90, 6000 Count TRMS, uA Range, NCV, VFC - Page 1
Forum section: electronics / testgear

author: sleemanj
author_rank: Super Contributor
timestamp: May 31, 2019, 07:21:50 am
content: Another cheap (sub $20) Chinese meter arrived in the post today.Mestek DM90, lSNAKOL SY76 looks like another branding, maybe more.Positive: cheap ($15-20 Aliexpress) 6000 count hand-sized meter. Sturdy construction. 3xAAA cell. Has a 600uA range (and 60mV range). Ceramic fuses (5x20mm - 250v). NCV, led torch light (flashlight), and "V.F.C" mode (AIUI adds a low-pass filter to the AC voltage mode for measuring variable frequency drive voltages?). Flashlight has a dedicated button, seaprate to the backlight (many meters share the function which is annoying). Marked as 600v Cat II which I rate as a positive because at least they are not being blatantly outlandish.Negative: flashlight not very bright. The rubber boot has cut outs around a "grip" moulding in the plastic case, that's just silly it means the plastic seam of the case is exposed. Does not have temperature mode. Manual indicates fuses are 700v, they are not, and no marking on case to indicate 250v on current ranges either. Dial markings are maybe a little on the small side. Fair amount of chinglish in manual. And the big one... the banana sockets are a fraction too small for some plugs!Seriously, the banana sockets are like 0.2 maybe 0.3mm too small (diameter) to comfortably fit my preferred banana plugs, which fit in every single other meter I have, they will go in partly, but it's waaay too tight. The probes fit in fine, as do cheap "leaf spring" type banana plugs, but the good high current ones, nope. I've never encountered a banana socket they don't fit in until now. Some other multimeter probes also have trouble seating in there all the way.Even before I plugged in a, err, plug, I looked at the sockets and something just looked "small" about them, which caused me to grab a banana plug to try.So in short, good set of features, great price, well constructed, let down at least for me mainly by fractionally too-small sockets.High current banana, about as far as I can force it in (and I do meanforce), normal "leaf spring" type bananas are okYou can see it just doesn't go all the way in, the socket is too tightRubber boot has these cutouts where the plastic case has a moulded "grip" section.Otherwise it's a tidy meter assembly, not bad, just those damn sockets a real shame!The high current banana on the left, and the leaf-spring style on the right...
Manual for a Harrison 6201a - Page 1
Forum section: electronics / testgear

author: Eth7an
author_rank: Contributor
timestamp: May 30, 2019, 03:25:03 pm
content: Does anybody have a manual for this power supply? I found one or two on ebay, but I don't have 20 bucks to see it

author: graybeard
author_rank: Frequent Contributor
timestamp: May 31, 2019, 01:06:21 am
content: The6201B version manual is here. It is probably close enough. HP bought Harrison and that became their power supply division. HP grew into new test equipment lines by buying smaller companies.

author: piyaphngcram
author_rank: Newbie
timestamp: May 31, 2019, 04:38:39 am
content: It's the information I'm looking for as well.
EEV Blog Brymen 235 multimeter issues - Page 1
Forum section: electronics / testgear

author: willocks1718
author_rank: Newbie
timestamp: May 31, 2019, 12:37:14 am
content: I have a lightly used EEV Blog Brymen 235 multimeter that I bought from here 2-3 years back...most likely 4-5 years because I'm horrible with dates haha. Anyway I was trying to do some electrical work the other day and noticed I could not get the meter to measure voltage to check if an outlet was de-energized. I could get it to measure the frequency and know it was powered down that way but I can't measure AC or DC voltages. It seems to still measure continuity as I can touch the probes together can it will beep. Any idea what I can check and possibly fix myself? I believe the fuses are still good and don't think they are the issue.Thanks!

author: bob91343
author_rank: Super Contributor
timestamp: May 31, 2019, 12:49:08 am
content: That doesn't look like an easy fix. I suspect some problem deep within the innards, like a bad processor or solder joint.
Joystik Drive VSI schematic - Page 1
Forum section: electronics / testgear

author: carioquenho
author_rank: Newbie
timestamp: June 07, 2019, 06:56:20 pm
content: Please, I have a motorized chair control model PG VSI 4 buttons to repair. It is necessary to individualize the burned components. I show images of the components burned on the PCB. An electronic scheme or detailed picture of the PCB would be very useful. Thanks in advance.
121GW Micro Amps auto range ESP32 DeepSleep - Page 1
Forum section: electronics / testgear

author: the-wal
author_rank: Newbie
timestamp: May 31, 2019, 12:22:29 am
content: Hi Team and thank you in advance for any advise and help.I currently have Dave's uCurrent gold and a Current Ranger to measure the current usage on my ESP32 projects.The reason I got the Current ranger with the uCurrent the ESP32 keeps resetting when it comes up out of deep sleep.I want to get the 121GW so I can run the measuring over a long time and log via bluetooth, can anyone tell me if I will have the same problem with the 121GW as I do with the uCurrent.Sorry if I didn't explain the issue correctly.CheersTony.

author: EEVblog
author_rank: Unknown
timestamp: May 31, 2019, 12:31:28 am
content: The 121GW, like all multimeters, has fixed shunt resistors that don't change with autoranging. This is why meters have range µA, mA and A switch positions and physical jacks you have to change.So no, it and other meters are not like the current ranger that electronically switches shunt resistors.
AGILENT equipment chassis growing metallic whiskers ! - Page 1
Forum section: electronics / testgear

author: lowimpedance
author_rank: Super Contributor
timestamp: May 31, 2019, 04:06:28 am
content: So I went to use my work 33521b function gen. annnd ....... nothing completely dead. Okay open it up to look for the mains fuse and test the PS but also found a little surprise,(which may have been involved with the failure), silently growing over the last 6 years. see the pictures below.It appears to be zinc plating on the internal chassis and is covered almost completely with very very fine metallic whiskers just waiting to be dislodged and cause shorts on the PCB's.This unit has lived all of its time after delivery in an air/humidity controlled environment. If you have any Agilent gear from around 2010-3 vintage I would recommend having a look inside for these 'growths'as you may be in for a rude surprise one day if you think it wont happen in your gear.I have tried hard to get the best photo's I could with gear I had to hand , and those still do not convey the full extent that is visible to the eye at the right angle.The hair like structures you see in the photos are up to 6mm long.And no its not dust, most definitely metallic.

author: graybeard
author_rank: Frequent Contributor
timestamp: May 31, 2019, 10:11:30 am
content: That is interesting. I know about tin whiskers, which is why lead free solder is not used in high reliability applications, and one of the many reasonslead free solder sucks. But I had not heard about zinc whiskers. They are apparently a big issue in older equipment.Here is aninteresting NASA presentation on zinc whiskers.NASA has web site about other than tin whiskers. In my work I have recently encountered gold whiskers.

author: Berni
author_rank: Super Contributor
timestamp: May 31, 2019, 10:27:51 am
content: Ouch that not nice.I heard of cases where there had this happen to the metal ventilation ducts going to a server room. They only found out once the servers in there started mysteriously giving up the ghost one after the other.

author: voltsandjolts
author_rank: Unknown
timestamp: May 31, 2019, 11:40:20 am
content: Seems like lots of lab gear these days has zinc plate rather than pure corrosion resistant metals.Time bomb
ITECH IT-M3100 Series Ultra-compact PSUs - Page 1
Forum section: electronics / testgear

author: maukka
author_rank: Unknown
timestamp: May 30, 2019, 08:49:46 am
content: Noticed this on the ITECH Youtube channel. Cute as a button, but no tech specs on their site yet.Quote

author: thm_w
author_rank: Super Contributor
timestamp: May 30, 2019, 10:23:43 pm
content: Spec is here:http://www.jicheng.net.cn/products/html/itech_it-m3100.html400-850W, 20V to 600V.But its a huge rack mount supply, its not small like they are indicating in the youtube video..

author: nctnico
author_rank: Super Contributor
timestamp: May 30, 2019, 10:45:03 pm
content: These are not huge rack mount supplies. It seems to me half width 1U units. I doubt these will be quiet though.

author: thm_w
author_rank: Super Contributor
timestamp: May 31, 2019, 12:17:35 am
content: Quote from: nctnico on May 30, 2019, 10:45:03 pmHuge compared to a regular bench supply. I don't think too many people here care about the size of their rack supplies (a normal rack is what 25 or 42U?).The youtube video is it sitting in someones hand.

author: nctnico
author_rank: Super Contributor
timestamp: May 31, 2019, 12:25:01 am
content: Quote from: thm_w on May 31, 2019, 12:17:35 amNot at all. A regular bench power supply is about half the width of a 1U device. This is often done so two fit next to eachother in a rack. If the depth is reasonable these could be very useful on the bench as well because the height is less than 5cm. A regular bench power supply is about 12cm to 15cm in height so you can have 3 or 4 power supplies with lots of power in the same space. Two of these Itech units could replace two full width 3U HP 6012A power supplies (which for some reason don't want to get off my bench) by a solution which only needs 1/6th of the volume.
BK Precision 8602 Battery test mode - Page 1
Forum section: electronics / testgear

author: gasmeter
author_rank: Contributor
timestamp: May 29, 2019, 08:42:52 am
content: Hi all I wonder if anyone can help.I set up an over night battery capacity test using the built in function.I set the limit params , although why time has to be set seems silly to me .I got in this morning and it had completed and was happily showing my timeout period and the capacity I told it to stop at.So I looked at it and asked soooo.... Why are you telling me the information I entered ?I know it can't have hit the capacity and timeout at the same time (pretty sure it didn't get anywhere near the lower voltage) .So how do you tell when you come back in the next day which parameter caused the test to end ?, given that its displaying both the timeout period I entered and the capacity stop value.The manual doesn't help at all !Peter

author: gasmeter
author_rank: Contributor
timestamp: May 30, 2019, 04:35:11 pm
content: It worked second time around.
Ut210e max/min mod - Page 1
Forum section: electronics / testgear

author: OmarElmasry
author_rank: Newbie
timestamp: May 30, 2019, 07:29:16 am
content: Hello nerdsI'm wondering if there is any way I can modify my Uni-t ut210e to have max/min function as other multimeters.I read on the forum that the chip does actually support the feature but I'm not sure how to enable it.Anyone had any luck with that?
Looking for datasheet or specs for Power Designs C.V.T.-1 current transformer - Page 1
Forum section: electronics / testgear

author: JohnG
author_rank: Frequent Contributor
timestamp: May 30, 2019, 07:59:02 pm
content: I have a couple Power Designs C.V.T.-1 current transformers. The design is very similar to Pearson CTs, and they are labeled 5000A max at 0.1 V/A. I am looking for information on the frequency response, droop, etc. of these CTs, and any help would be appreciated.Cheers,John

author: Hydron
author_rank: Super Contributor
timestamp: May 30, 2019, 09:35:56 pm
content: As a first pass I'd just lash something up on the bench and test them. If you have a scope with a FRA (bode-plot) function then this is easy, but still doable with a standalone sig-gen. Passing the sig-gen output through the CT then into a 50R termination on the scope gives a nice 50V/A reference channel to trigger on/compare to and allow for averaging to be used on the lower amplitude 0.1V/A trace.For a 0.1V/A model I'd expect a few 10s of MHz upper 3dB point (if they are indeed similar to a Pearson), and shouldn't be too hard to get some sensible results. Will get harder to test well with a higher 3dB point unit mind.Phase response towards the upper 3dB point (and to a lesser extent, frequency) will be affected by how centred the conductor is in the CT, but at least you'd get a ballpark figure, and you can always try and put the conductor to one side to get a worst-case.Droop etc will be a bit harder, but Pearson has a suggested test circuit in their app notes:https://www.pearsonelectronics.com/support/application-notes/testing-procedure

author: JohnG
author_rank: Frequent Contributor
timestamp: May 31, 2019, 03:09:25 pm
content: Thanks, I appreciate the response. I do know how to measure it, but I just like to have manufacturer's documentation when possible.Cheers,John
In the market for a new multimeter - Page 1
Forum section: electronics / testgear

author: TestTester2020
author_rank: Newbie
timestamp: April 18, 2019, 09:34:16 pm
content: Hi Guys, As the subject says, I'm looking for a new graphical multimeter. I have my eye on this one >https://www.aaatesters.com/Fluke_867B_Multimeter_Model_867B_Fluke_867B.html, but have read that there may be better options especially regarding battery life.Any thoughts or guidance is appreciated!

author: bob91343
author_rank: Super Contributor
timestamp: April 18, 2019, 10:48:00 pm
content: Well for a thousand bucks I would do a lot of looking around. I don't think I spent that much on my entire lab of test gear, including generators and counters and voltmeters and 'scopes. Further, having so many functions wrapped up in one unit means (to me) high risk of it screwing up beyond economical repair.I do like the Fluke 87 but have never owned one.I know I am not addressing your query so forgive me for this kind of answer.

author: Old Printer
author_rank: Frequent Contributor
timestamp: April 19, 2019, 02:14:27 am
content: deleted comment

author: Magnum
author_rank: Regular Contributor
timestamp: April 19, 2019, 02:22:18 am
content: Check a Metrix MTX 3293.Unfortunately their Website is down at the moment. But a very good Meter.

author: luma
author_rank: Regular Contributor
timestamp: April 19, 2019, 02:34:23 am
content: When you say “new” are we talking “new to you” or “new out of the box”? The 867B is an old and discontinued meter. Maybe the 289 might suit you?

author: Simon
author_rank: Unknown
timestamp: May 29, 2019, 06:26:54 am
content: He's a now banned spammer!
AWG differential voltages, sinking current? - Page 1
Forum section: electronics / testgear

author: HendriXML
author_rank: Super Contributor
timestamp: May 29, 2019, 10:32:16 am
content: I tried to use the 2 channels of a SDG1032X, in combined mode to do a offset, just to keep the output of the first in the high resolution range of a MM. however it seems that the combining is not done on the analog side.https://www.siglentamerica.com/operating-tip/generating-complex-waveforms-using-siglents-combine-function-x-series-dual-channel-generators/However like using a poor mans differential probe, the AWG has also a differential between the 2 non-ground BNC connections. Using this differential, one channel will be sourcing, one will be sinking current. The question is, are they designed to also sink current?I already have a work around thought out, like if the sinking channel, sources a 50 ohm resistor, that resistor can do the “sinking”, that will work fine with small currents.But I’m still curious whether technically such a work around is needed. (In general, not only in the case of the small burden of the MM)Looking at method 1 of the link one would say is is possible. It’s like having a HiZ load, and have the outputs divide the voltage between them sinking and sourcing maximal. So I think no resistor is needed

author: David Hess
author_rank: Super Contributor
timestamp: May 29, 2019, 09:37:35 pm
content: Each channel can sink current just fine but just because you use them as a differential output does not mean they are floating relative to ground.

author: HendriXML
author_rank: Super Contributor
timestamp: May 29, 2019, 10:25:10 pm
content: Quote from: David Hess on May 29, 2019, 09:37:35 pmIt’s only to create a (calibration) mapping with a (ungrounded) MM.https://www.eevblog.com/forum/testgear/using-a-awg-and-a-scope-do-a-low-voltage-level-characterization-of-a-1n4005/msg2444139/#msg2444139I understand that doing measurements with a scope or a circuit that is grounded this won’t work.But it’s good to know, that no resistor is required.
Display waveform 1Khz use HY3131 and STM - Page 1
Forum section: electronics / testgear

author: hongthiet1994
author_rank: Contributor
timestamp: May 28, 2019, 03:30:19 am
content: I had DMM 121GW.I have ideal display signal waveform on smartphone.(< 1Khz)i don't know ADC speed HY3131 is enough to read waveform?Any other suggestions for me?Thank you so much

author: JonathanLee
author_rank: Newbie
timestamp: May 29, 2019, 01:43:20 pm
content: High Speed ADC x 2 / Max 76.8kHz samplehttps://www.hycontek.com/wp-content/uploads/DS-HY3131_TC.pdf
Power Off Siglent SDS1204X-E - Page 1
Forum section: electronics / testgear

author: CB
author_rank: Newbie
timestamp: May 26, 2019, 09:53:51 am
content: Hi!I've recently bought a Siglent SDS1204X-E, and have noticed that the power button glows on and off when the scope is powered down (but plugged into my PDU).Question: Is this a problem? Should I put the scope on switched power so that off is off?Thanks!

author: Rerouter
author_rank: Super Contributor
timestamp: May 26, 2019, 09:57:47 am
content: The scope when off is in a sleep mode with the USB and Ethernet disabled, power consumption should be less than 1W from memory, If some other factor is your concern, raise It and we can go from there.

author: Old Printer
author_rank: Frequent Contributor
timestamp: May 26, 2019, 03:59:08 pm
content: My new SDS 1104X-E is the same. Some energy conscious users are put off by it, but for me it is nothing to loose sleep over. I have not measured the current consumption but I would think it is minuscule.

author: nez
author_rank: Regular Contributor
timestamp: May 27, 2019, 10:55:11 am
content: Ha, ironically the glowing power button light irritates me at night since I have my scope in the corner of my bedroom next to my desk, and I'm very picky about lights while I'm trying to fall asleep. So I would lose sleep over it (to exaggerate) if I didn't cut the physical power.In my perfect world there would be an option to disable the sleep-mode pulsing light, but of course it's not a huge issue.

author: JPortici
author_rank: Super Contributor
timestamp: May 27, 2019, 11:47:18 am
content: It's a non-issue as you can use sockets with switches.I don't know if it is possible in the SDS1000X-E, but in other siglent equipment such as the SSA spectrum analyzers you have an option to switch on the instrument as soon as power is applied. I was told this is done to enable remote on-off for automated test equipment

author: tkamiya
author_rank: Super Contributor
timestamp: May 27, 2019, 04:14:31 pm
content: Mine is the same way. I find it annoying.

author: tautech
author_rank: Super Contributor
timestamp: May 27, 2019, 08:05:46 pm
content: Quote from: JPortici on May 27, 2019, 11:47:18 amYes, many of the modern Siglents have user selectable ON at the reconnection of power, X-E DSO's too.However they prefer soft OFF using the power button for a controlled shutdown.

author: Tsippaduida
author_rank: Contributor
timestamp: May 27, 2019, 09:10:03 pm
content: Siglent DSO's aren't very low power devices on standby. Remember, "you can fly to the bloody Pluto...". Don't know how power efficient other DSOs or MSOs are.https://youtu.be/E3B4OTV8f1o?t=1488I have one of these. Would like to see proper off-switch, not just this "high power soft off" crap. Well, I either use sockets with switches or just pull the plug.
Rigol DS1054Z successor ? - Page 1
Forum section: electronics / testgear

author: 0xFFF0
author_rank: Regular Contributor
timestamp: May 27, 2019, 08:20:38 am
content: Does anyone know if there is already a successor to the Rigol DS1054Z in the pipeline?

author: EEVblog
author_rank: Unknown
timestamp: May 27, 2019, 10:04:44 am
content: I haven't heard anything.Still sells really well, they won't be looking to replace any time soon I'm sure.

author: 0xFFF0
author_rank: Regular Contributor
timestamp: May 27, 2019, 08:19:51 pm
content: 5 years increment. It's time!2009: 10522014: 10542019: ?
looking for a good text on VNAs - Page 1
Forum section: electronics / testgear

author: worsthorse
author_rank: Super Contributor
timestamp: May 27, 2019, 06:04:22 pm
content: I've acquired a long-desired piece of gear, the SDR-kits WVNA 3, along with a Rosenberger SMA cal kit. My reach exceeds my grasp... I am flummoxed by it. I really need to do some basic reading/study/experimenting to learn how to use this gear properly.So.... anyone here know a good basic book or two I might buy (or borrow using inter-library loan) to guide me? I am old-fashioned and like POT (plain old textbooks). Plus I don't have the attention span (or patience) to wade through a zillion youtube videos or websites to find a gem or two.Thanks in advance!

author: DaJMasta
author_rank: Super Contributor
timestamp: May 27, 2019, 06:11:09 pm
content: I'd start with googling "keysight vna basics" and taking a look at the first few PDF links, it's a good starting point. There's a fair bit of intro information around online (and I think if you look through the RF forum you'll find some relevant recommendations) between information from vendors and information from hobbyists/hams.

author: egonotto
author_rank: Super Contributor
timestamp: May 27, 2019, 07:12:58 pm
content: Hi,https://www.amazon.de/Handbook-Microwave-Component-Measurements-Techniques/dp/1119979552https://www.springer.com/de/book/9783319447711https://onlinelibrary.wiley.com/doi/book/10.1002/9780470513217Rohde & Schwarz have too infos.Michael Hiebel_Vector Network Analyzer Calibration: The BasicsFundamentals of Vector Network Analysis.And a book from Rohde & Schwarz:https://www.amazon.de/Fundamentals-Vector-Network-Analysis-Michael/dp/3939837067have fun.Best regardsegonotto
Audio upconverter to see audio spectrum with an Agilent Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: xardomain
author_rank: Contributor
timestamp: April 30, 2019, 11:49:40 pm
content: Hello,I would like to find a way to see the audio spectrum using my spectrum analyzer (HP ESA1500L) and found this on Ebay:https://www.ebay.it/itm/Spectrum-Analyzer-Low-Frequency-Converter-BG7TBL-SA-LF-CONV-Spectrum-Analyzer-ts/183780250687?_trksid=p2485497.m4902.l9144this should work, provided I take into account the 50Ohm impedance input.Has Anyone has tried something similar and/or this specific product?TIAGiuseppe MarulloIW2JWW - JN45RQ

author: DaJMasta
author_rank: Super Contributor
timestamp: May 01, 2019, 12:43:55 am
content: It's doable, similar approaches are used for low frequency on some SDRs, and it's basically just mixing it with a carrier and then trying to keep the images to a minimum. That said, you'll probably get better results with a PC sound card and a spectrum display program, like the freeware Spectrum Lab.A lot of SAs will be usable below their rated frequency, though, see if you can just set your span to start at 0Hz and maybe there will be a good bit of usable area in the audio band even if it's not specified as being totally even or leveled. My R3477, rated to 9kHz, would give you a usable spectrum plot to about 200Hz, where the noise floor started spiking up so the dynamic range was really small.

author: xardomain
author_rank: Contributor
timestamp: May 26, 2019, 10:59:19 pm
content: Hello DaJMasta,I tried with my SA, but it seems it is not capable to go that low.I am uncomfortable with using a sound card, I always get the feeling it is not a real instrument, but I will give it a go.It happened to me that I already have a LF converter (HamItUp v1.3) that should go as low as 300Hz, so I could use it for a quick test with the SA. It is a pretty decent unit, with 125MHz TCXO and a 10MHz timebase input.I still need to adapt the impedance, it has 50Ohm but I found some schematic on the net for that.Giuseppe MarulloIW2JWW - JN45RQ

author: jpb
author_rank: Super Contributor
timestamp: May 27, 2019, 01:14:25 pm
content: You don't mention things like budget and performance requirements or how low the audio frequency goes (if it is below 10Hz then sound cards may start to tail off).To make a sound card more like a real instrument you could build this front end (the pcb is available on ebay):http://www.pmillett.com/ATEST.htmIf you have lots of cash then something like the Picoscope 4262 is very low noise and true 16 bits up to 5MHz - there is quite a lot of info on it on these forums, e.g. :https://www.eevblog.com/forum/projects/using-a-picoscope-4262-as-a-low-frequency-recording-spectrum-analyzer/
Marconi 2031 ‘can not set up link between processors’ - Page 1
Forum section: electronics / testgear

author: Hkphooy
author_rank: Newbie
timestamp: May 26, 2019, 06:55:24 pm
content: Hi,I’ve just brought a unit of eBay and it’s showing the error ‘ can not setup link between processors’. I’ve tried to find this error in the manual but nothings listed. Any ideals?

author: hendorog
author_rank: Super Contributor
timestamp: May 26, 2019, 09:33:52 pm
content: Does the front panel work ?There is a processor controlling the front panel operation which talks to the main cpu via a serial bus so maybe that is the link which it cannot setup.

author: Hkphooy
author_rank: Newbie
timestamp: May 26, 2019, 11:11:56 pm
content: Front panel appears to work ok but can’t reset screen from error message,

author: Hkphooy
author_rank: Newbie
timestamp: May 27, 2019, 07:19:24 am
content: Is it repairable?

author: hendorog
author_rank: Super Contributor
timestamp: May 27, 2019, 07:55:29 am
content: Maybe try on the marconi/if Yahoo group. There are some people there who fix these.
HP 4329A High Resistance meter teardown - Page 1
Forum section: electronics / testgear

author: kj7e
author_rank: Frequent Contributor
timestamp: May 23, 2019, 10:53:36 pm
content: I've been waiting for one of these to show up in good condition for a reasonable price. One popped up last week and I snagged it. Looks to be in good shape and fully functional. Best I can test (to 10GOhm) its well with in calibration.Link to service manual;https://doc.xdevs.com/doc/HP_Agilent_Keysight/HP%204329A%20Operation%20&%20Service.pdfLink to member pa4tim's page;http://www.pa4tim.nl/?p=2269

author: Tomorokoshi
author_rank: Super Contributor
timestamp: May 24, 2019, 02:37:50 am
content: With an oscilloscope, what does your Recorder output on the back look like? From the manual:"RECORDER OUTPUT: 0 to 100mV analog output proportional to meter deflection. Output impedance is 1kOhm."Is it DC or is there a lot of noise on it?

author: exe
author_rank: Unknown
timestamp: May 24, 2019, 10:10:03 am
content: Wow, what a beatiful piece of gear! I'd get one like this, but I'm afraid of being electrocuted by it.

author: kj7e
author_rank: Frequent Contributor
timestamp: May 26, 2019, 07:49:08 pm
content: Quote from: Tomorokoshi on May 24, 2019, 02:37:50 amSorry for the late response, I just checked and there is lots of noise on the Recorder Output. I suspect you found the same.

author: kj7e
author_rank: Frequent Contributor
timestamp: May 26, 2019, 08:27:57 pm
content: Picked up a paper manual for cheap and just did the performance verification tests. No need to touch it, works perfectly. I pulled the power supply board and checked the electrolytics, one is a bit low, 22uF measures 16uF but all others are good. About the highest resistance I can test right now is the 10GOhm input on my HP 3456A, which reads just over 10GOhm, the HiZ input on the Keysight 34465A reads about 8GOhm. No idea what I'm going to use this for yet.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: May 26, 2019, 09:23:36 pm
content: Quote from: kj7e on May 26, 2019, 07:49:08 pmThanks for checking it. Yes, mine has the noise. I just found my notes. It appears to have a 2.3 kHz component to it. It doesn't seem correlated to either 60 Hz power or to the 100 kHz conversion oscillator circuit.I was able to get fairly clean DC with a large electrolytic capacitor on the output terminals. The signal is basically the same that goes to the meter element. The mechanical momentum of it is able to damp out the noise.Anyway, the electrolytic capacitor is not really the best solution for various reasons, and I was getting too deep in it for what I needed at the time. Eventually I will try to find a more elegant solution.
I have an old multimeter. Looking for a manual. - Page 1
Forum section: electronics / testgear

author: LONERANGER
author_rank: Newbie
timestamp: May 25, 2019, 01:39:15 pm
content: I have an DI-LOG DL295 multimeter from 1990. But no user manual. Looking for manual from DI-LOG DL295 or UEI DL295. Thanks

author: trevatxtal
author_rank: Contributor
timestamp: May 25, 2019, 02:07:27 pm
content: Hello loneranger sorry I am unable to help with a manual, But I can say it is not that old I have seen the same or very similar in Automotive repair shops.Look on Ebay they might have one to compare not to purchase, looks Chinese origin.RegardsTrev

author: LONERANGER
author_rank: Newbie
timestamp: May 25, 2019, 03:18:35 pm
content: It's Korean. Di Log Test instruments DL295. Been looking for 2 years.Sent from my SM-N950W using Tapatalk

author: Arjunan M R
author_rank: Regular Contributor
timestamp: May 25, 2019, 03:32:16 pm
content: Found some information about your DMMhttps://www.dallasavionics.com/uei/uei.pdf

author: LONERANGER
author_rank: Newbie
timestamp: May 25, 2019, 05:49:46 pm
content: I have that. ThanksSent from my SM-N950W using Tapatalk

author: bob91343
author_rank: Super Contributor
timestamp: May 25, 2019, 10:35:07 pm
content: Most of its functions are very obvious. The only things somewhat obscure are the comparison record and memory functions.If I had one I would just experiment and see what it does.This thing pales in comparison with my GR 1658 Digibridge which has limit functions, bins for selection, and more. I played with it many times and it's just not user friendly. And I have the manual.

author: Arjunan M R
author_rank: Regular Contributor
timestamp: May 26, 2019, 02:45:39 am
content: Found some information about a dmm similar to yours.DL297T.https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjN1d6jhrfiAhXQ7HMBHa1ZC5wQFjAAegQIBBAC&url=https%3A%2F%2Fwww.cpsohio.com%2Fmanual_download.php%3Fmanufacturer%3DUNE%26manual%3DUNE0046&usg=AOvVaw1fBSweu86glBgomDY-3sDd

author: Arjunan M R
author_rank: Regular Contributor
timestamp: May 26, 2019, 02:49:17 am
content: It can measure temperature

author: Arjunan M R
author_rank: Regular Contributor
timestamp: May 26, 2019, 02:56:10 am
content: Check this outhttps://www.coleparmer.in/i/uei-heavy-duty-multimeters-3-digit-4000-count-multimeter-with-temperature/2683210

author: LONERANGER
author_rank: Newbie
timestamp: May 26, 2019, 09:36:28 am
content: Has no manual on that site.Sent from my SM-N950W using Tapatalk
MOVED: HP8656B: To calibrate or not to calibrate, that is the question-where in Sydney? - Page 1
Forum section: electronics / testgear

author: Brumby
author_rank: Unknown
timestamp: May 24, 2019, 10:08:23 am
content: This topic has been moved toMetrology.https://www.eevblog.com/forum/index.php?topic=188817.0
Tektronix DMM 4050 Signal Express Disk - Page 1
Forum section: electronics / testgear

author: Johnny10
author_rank: Frequent Contributor
timestamp: May 26, 2019, 01:58:34 pm
content: Does anyone have a copy of the Tek Signal Express disk for the DMM 4050?Wait looks like the disk gives 30 day trial and Signal Express on NI site gives 7 day.So that kinda raises the question of ... not much of a difference. I downloaded the Signal Express 2015 program will play with that.