hybridfree/eevblog-posts huggingface dataset:
ML4100 PM3632 pod question - Page 1
Forum section: electronics / testgear

author: guido
author_rank: Regular Contributor
timestamp: August 12, 2015, 10:43:21 pm
content: Does anyone have an 6502, 6800 or 6809 pod for an Arium ML4200 or Philips PM3632 logic analyser?I don'tBut the schematics and ROM dumps are availalbe now (EBAMAN) and i'm thinking of building my own pods.However, i think the schematic is not correct and two lines are crossed. Being the enable lines of the side connector buffer and the pod id buffer. According to the schematic:U3 ('F373) pin 1 is connected to U4 ('HC00) pin 11 andU6 ('LS244) pin 1 and 19 are connected to U4 pin 12.I think this should be crossed, by comparing with the schematics of the the other pods.Could anyone with one of these pods do a quick check please?If anyone has any pods for sale, i'm also interested

author: guido
author_rank: Regular Contributor
timestamp: October 13, 2015, 11:03:18 pm
content: I asked a similar question on a local forum and i got a reply from someone. Not with info, but i was offered a second LA. I took it as it came with a number of podsSo i've stopped building my own.It included a 6800 and two 6502 pods. I would like to convert one 6502 to a 6809 pod. It's the same pcb, just different parts and jumpers in places. Only problem is that the6809 disassembly ROMis not availableAnyone?The LA came with disas ROMs. I think these are newer revisions. I will upload them to EBAMAN when i look at the analyser itself. For now i'm working on the pods (one 6502 is heavily modified, the other one a bit in pieces). First testing tomorrow.By the way, i'm right about the schematic being incorrect!
Fluke 175 capacitance autohold - Page 1
Forum section: electronics / testgear

author: hhhh
author_rank: Contributor
timestamp: October 13, 2015, 08:10:00 am
content: 175 is my first fluke, so bare with me.I measured some caps just to test it out, and I noticed that the autohold does not work when measuring capacitance. It does work with voltage.Autohold activates just fine, but that's it. No measurements with autohold. The normal mode works fine.Can Anyone check if this is by design? I used a 2200uf electrolytic out of circuit.EDIT:I works, it just takes about 10 seconds to display the value. Using the regular mode the value is instant and stable, but I guess it's not somehow stable enough for the autohold.
ESI engineering bulletin no.24 (Calibration of a KV divider) - Page 1
Forum section: electronics / testgear

author: lowimpedance
author_rank: Super Contributor
timestamp: October 12, 2015, 11:21:41 pm
content: Seeing the recent ESI KV dekapot 'internal photo' post, prompted me to finally scan these OLD ESI egineering bulletins I had, for the reference of all you metrologists out there. (not sure if these allready exist somewhere else, a quick search gave no results as such)here they are ;

author: Vgkid
author_rank: Super Contributor
timestamp: October 12, 2015, 11:53:56 pm
content: Thanks for uploading those, I will download those to my computer later. Read them on my phone.

author: crispy_tofu
author_rank: Super Contributor
timestamp: October 13, 2015, 01:27:34 am
content: Although I probably won't know what it means, it's still great to have. Thank you!!
Terminating BNC T-Adaptor on a measurement unit - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: October 12, 2015, 02:05:36 pm
content: I have a BNC F-M-F T-adapter connected to a BNC-F to dual banana plug connector which itself is connected to a precision PS. I don't always need to feed the output of the PSU to two devices from the T-adapter and often have one of the female ends unconnected. Is there some sort of a shielded metal connector I can screw on to a female BNC connector to keep the noise level down. This screw on connector should not be a terminator (i.e., it show impose no load, just shield the female connector).

author: Fraser
author_rank: Super Contributor
timestamp: October 12, 2015, 02:15:58 pm
content: Just look for a metal BNC dust cap on eBay. They are pretty common.Just checked eBay and BNC dust cap will show you what you been suggest you go for the type without the centre pin as its not connected to anything anyway.Fraser

author: AF6LJ
author_rank: Unknown
timestamp: October 12, 2015, 02:16:58 pm
content: I am not so sure an unterminated BNC connector would be a source of additional noise in your measurement setup. Take a male BNC connector and solder a metal plug over the end that the cable would normally come out of. There is your shielded end cap, you don't need a center pin in the male connector.I doubt you would see any reduction in noise in your measurement set up.

author: SharpEars
author_rank: Unknown
timestamp: October 12, 2015, 02:44:13 pm
content: Quote from: Fraser on October 12, 2015, 02:15:58 pmI see this one, but am not sure if it introduces a 50 ohm load or not:http://www.ebay.com/itm/10pcs-Dust-cap-BNC-Female-Straight-Protective-Dust-cap-RF-connector-adapter-/160957072320?hash=item2579ca03c0

author: AF6LJ
author_rank: Unknown
timestamp: October 12, 2015, 02:57:33 pm
content: Here....http://www.digikey.com/product-search/en/connectors-interconnects/coaxial-connectors-rf-accessories/1442686About the ninth one down.

author: djQUAN
author_rank: Frequent Contributor
timestamp: October 12, 2015, 03:15:49 pm
content: Quote from: SharpEars on October 12, 2015, 02:44:13 pmProbably not as 50ohm terminators usually have a label on the end saying 50ohm.
Solartron LM1619/1620 DVM Service Manual - Page 1
Forum section: electronics / testgear

author: dexters_lab
author_rank: Unknown
timestamp: October 12, 2015, 05:39:43 am
content: I have an old Solartron Digital Voltmeter LM1619 here i would like the service manual (or even just the user guide) for if anyone knows where i might find some info on it?Dates from the early 1970s at a guess, it's a valve/nixie tube device
Good Metrix/BK multimeters on Ebay - Page 1
Forum section: electronics / testgear

author: Robomeds
author_rank: Frequent Contributor
timestamp: October 11, 2015, 07:29:46 pm
content: First, if this is an inappropriate post please delete it. I'm posting two ebay listing that I think might be of interest to the group. I have NO knowledge of the sellers nor vested interest in the sale of the meters. I just noticed these meters and thought I would point to the listings.Both of these are BK's 53x0 series meters which ere rebranded Metrix TTN meters. I did a tear down of my own a while back.https://www.eevblog.com/forum/testgear/metrix-mx56c-bk-precision-5390-multimeter-teardown/The 5370 is listed for about $60 after shipping. It has Fluke 87 like accuracy but a 50,000 count display and temp measuring. The 5390 is listed for around $90. It has 0.025% DCV accuracy but lacks the temp measurement.5370:http://www.ebay.com/itm/181893391334?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT5390:http://www.ebay.com/itm/281823598614?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AITFor what is likely to be $60 (well it would be for me) the 5370 would be REALLY tempting if I didn't already have too many meters. Anyway, hope some EEVBlogs get a deal.

author: Robomeds
author_rank: Frequent Contributor
timestamp: October 12, 2015, 02:18:11 am
content: The 5370 just sold for $50+$11 shipping (well my shipping quote was $11). I hope someone around here was the lucky winner. Heck of a nice meter for $60!
Site with equipment information, manuals, tricks....? - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: October 09, 2015, 02:30:33 pm
content: Does something already exist? A website with all sorts of Information like manuals, repair tips, tricks, hacks, firmware files and so on?If not I have some few 100GBs left on my own Server...just need to find a good domain name then (o;

author: AlfBaz
author_rank: Super Contributor
timestamp: October 09, 2015, 06:00:34 pm
content: Quote from: davorin on October 09, 2015, 02:30:33 pmhttp://www.ko4bb.com/getsimple/

author: Cubdriver
author_rank: Unknown
timestamp: October 09, 2015, 07:13:17 pm
content: For manuals for a lot of older test equipment, the BAMA site is an excellent resource:http://bama.edebris.com/manuals/-Pat

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: October 09, 2015, 09:52:56 pm
content: I have the most luck with KO4BB. It usually has the firmware backups and odd notes.These are some other links I have collected. All of them appear to be currently working.http://www.kennethkuhn.com/hpmuseum/scans/http://exodus.poly.edu/~kurt/manuals/manuals/http://bee.mif.pg.gda.pl/ciasteczkowypotwor/http://w140.com/sbcman/Technical%20Manuals-Main/http://service-manual.eu/manufacturers.php

author: miguelvp
author_rank: Super Contributor
timestamp: October 09, 2015, 11:34:19 pm
content: If any are missing from this sticky thread please add them:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/

author: tautech
author_rank: Super Contributor
timestamp: October 09, 2015, 11:43:11 pm
content: Quote from: miguelvp on October 09, 2015, 11:34:19 pm+1Most of the links above are already included within that thread and I often resort to them when Google does not do the job.

author: davorin
author_rank: Unknown
timestamp: October 11, 2015, 08:58:58 pm
content: Well...I've bought a domain name already....now have to find a good CSS template and wrap some PHP code around and do some PSQL stuff (o;Well...at least it would help me to keep all the documentation, software, tricks, tips and hacks at the same place ;-)Like in the good old days in Finland where I was super admin at edaboard.com (o;
HP/Agilent 34401A, possible to run it battery powered? - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: October 17, 2015, 10:36:40 pm
content: I was wondering, to get true power line isolation, it makes sense to power a DVM from battery power. Has anyone done any sort of mod the the 34401A to make it battery powered. I am not sure how the PLC (power line cycles) would work in this case, though.

author: VK5RC
author_rank: Unknown
timestamp: October 17, 2015, 10:55:04 pm
content: Won't this reduce accuracy considerably? I thought the idea of PLC was to reduce the deleterious effect of mains 'hum' everywhere. If you "isolate" the meter, it won't be able to synchronise with and then 'average out' the mains hum. (my dumb terms!!!!)I also thought they were truly floating dmms, the measuring inputs independent from mains.

author: SharpEars
author_rank: Unknown
timestamp: October 17, 2015, 11:20:27 pm
content: Quote from: VK5RC on October 17, 2015, 10:55:04 pmHmm, you have a good point and I hadn't though of that. Strange to think that a battery powered unit that is totally isolated from mains would have more noise than a mains powered unit.

author: VK5RC
author_rank: Unknown
timestamp: October 17, 2015, 11:57:30 pm
content: The way I think of it. it is not white noise, it is quite ordered i.e. 50 or 60 Hzso you can "allow" for it to some degree. Filtering or averaging over an integer number of PLC, phase coherent.
Anyone familiar with the Digitech HT-3110 precision voltage/current source? - Page 1
Forum section: electronics / testgear

author: slburris
author_rank: Frequent Contributor
timestamp: February 28, 2013, 10:05:27 pm
content: I have two of these HT-3110 units. I have no idea what kind of shapethey are in, although they look physically OK, just the usual stickers andmarker stuff from their previous life.I've been looking for a manual online with no luck. Heck, even a physicaloperation/service manual would be good.It looks like it takes the old style oval HP power cords that mate with thePH-163 connector, like this one from Skycraft:http://www.skycraftsurplus.com/cordpower1836ftovalhp.aspxExcept, I know there are two versions of these oval cords, and theHP versions have hot and neutral reversed from the normal ones.Luckily I have both versions of these cords, since they are nearlyimpossible to find these days. I just don't know which version theHT-3110 takes.So if anyone could throw some hints my way, point me at a manual,or tell me their war stories with this equipment, that would bevery helpful!Scott

author: Marko99
author_rank: Newbie
timestamp: October 10, 2015, 11:10:24 pm
content: Did you ever find a manual? There are several dozen adjustments for calibration. I'm lost....
uCurrent Gold range hack + Results + Glitches - Page 1
Forum section: electronics / testgear

author: EarthLord
author_rank: Contributor
timestamp: October 09, 2015, 05:25:54 pm
content: Hey everyone,Here's a small hack of uCurrent Gold for the purpose of measuring current of recent MCUs with radios. Thanks to our dear Dave 'Lee' Jones for this wonderful open source instrument.So I changed R1 resistor from 0.01 Ohm to 1 Ohm. (Sorry for the too much solder in the blob) You can see the 0.01 Ohm resistor stuck to one of the pins to the switch. Now the conversion should be almost 100 mV/mA. Also a USB cable is attached to the battery connector so that a USB battery bank can be used for power to get higher range for the measurement.Now for the actual use case. I've connected uCurrent on the high side to measure the power of a nrf51 chip on PCA10028 board when sending out periodic BLE advertisement packets. So in this case the current drawn varies from a couple of uA when sleeping to a maximum of 13-14 mA when both the radio and processor is ON. For this case the uCurrent should give less than a mV output when sleeping and less than the maximum range when fully powered up with this new mode of 100mV/mA.The uCurrent is powered by a battery bank. The nrf51 DK is powered by a laptop not connected to the charger. And the output of uCurrent is seen on a Hantek DSO5072P scope (1GSa/s, 70 MHz bandwidth).Here's the screenshot of the beautiful waveform of current consumed when sending out the advertisement packets in the three advertisement channels. The only blemish in the whole setup are these periodic glitches that you can see in the waveform. Any thoughts on why this could be happening?And any feedback on this hack? Cheers!

author: SeanB
author_rank: Super Contributor
timestamp: October 09, 2015, 05:54:56 pm
content: Glitches are probably the internal converter in the battery bank putting noise on the supply lines. Try using a 10R series resistor on the USB supply line and 100uF 10V capacitor across the ucurrent supply rails. Also change the resistor for the low battery/power led to 4k7, so you do not kill the LED and the battery detector. If you want better simply remove the USB and stack 2 CR2016 cells in the holder ( will fit and does work on a lot of these holders) to give a 6V supply rail with the only drawback being shorter battery life.

author: EarthLord
author_rank: Contributor
timestamp: October 10, 2015, 01:59:36 pm
content: Thanks for your suggestions. I'll see how the power bank supply rail is and add better decoupling for the uCurrent.Isn't the absolute maximum voltage of the maxim opamp used is 6V, this cutting it too close for using coin cells in series?
Can you post an .ARB file if you have a Rigol Signal Gen? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: October 09, 2015, 10:10:03 pm
content: I'd like to look at the format of what it creates when you make a waveform manually like the manual recommends. If someone could go in, set an amplitude, create an arb, maybe set it to 3 points and put 3 points in and then save it to file.arb and post it that would be cool. Thanks!
DS1074Z - Decode RS232 ASCII problem - Page 1
Forum section: electronics / testgear

author: matkar
author_rank: Regular Contributor
timestamp: October 10, 2015, 09:46:06 am
content: I've found a problem with the decoder. When decoding character "8" it actually displays "9" when in ASC mode. Other modes (HEX, BIN, DEC) return the correct value.I've tested on 38400, 8N1.I have the original firmware it came with the scope: 00.02.01.SP1Is this a known issue? Has it been resolved in newer firmware updates?

author: Karel
author_rank: Super Contributor
timestamp: October 10, 2015, 11:34:34 am
content: Quote from: matkar on October 10, 2015, 09:46:06 amNo problem here, running latest fw 00.04.03.SP1.

author: matkar
author_rank: Regular Contributor
timestamp: October 10, 2015, 09:12:13 pm
content: Thank you Karel.Obviously it's time for an update...

author: H.O
author_rank: Frequent Contributor
timestamp: October 11, 2015, 08:13:00 am
content: Have you tried all other characters and is it only '8' that's wrong?I'm thinking perhaps your actual baudrate doesn't match what the scope is set to so it misinterprets.I don't have a DS1054Z myself, just thinking out loud....

author: smithnerd
author_rank: Regular Contributor
timestamp: October 11, 2015, 12:00:30 pm
content: This bug was fixed in version: 00.04.02.03.00."4. RS232 decoder shows ‘9’ for ‘8’ input in ASCII format."(According to the firmwarerelease notes).
Mastech MS2010B / 32-800 Low Current Clamp Meter - Page 1
Forum section: electronics / testgear

author: ocw
author_rank: Regular Contributor
timestamp: October 10, 2015, 05:00:41 pm
content: Having found a Mastech MS2010B - 32-800 leakage current meter for $99.00 I decided to pick one up. It's more commonly available for $130 - $180. Besides leakage currents (the AC current difference between two wires) it can measure low single wire AC currents down to 10 uA resolution. Attached is a summary of my verification of its specifications. I compared it to the specifications measured on a UT210B.It would be nice if it measured DC currents as the UT210B does, but I'm sure that would raise its price. Its lowest AC currents range measures up to 40 mA with 0.01 mA resolution. It can measure up to 600 A and 600 VAC with a CAT III rating. Like most other leakage current ammeters, its clamp is a little bigger and heavier than normal. It had reasonable accuracy measuring low AC currents, although I found it a bit under its specified rating. At 500 mA and above its accuracy was very good. I stopped my measurements at 2 amps, expecting the higher currents to have similar accuracy. It has a low pass filter which can be activated to limit the effects of high frequency noise. I found that it was down about 10 dB at 950 Hz and 40 dB down just above 5 kHz.I can also measure the sampled frequency while it measures either current or voltage. Either a minimum 16 mA current or a 170 mV voltage needs to measured for a frequency to be shown. I was able to measure the frequency from 3 Hz up to 270 kHz with good accuracy, generally being one digit low. The actual frequency resolution seen didn't always match the value shown on its specification sheet.Its capacitance measuring abilities aren't the best. I didn't find it all that accurate and it only measures up to 100 uF.I can measure temperature and comes with a K thermocouple.It's nice to now have a way to measure leakage currents. However, if you don't have a need for a lower cost way of measuring that or other small currents, other meters are probably a better choice.
BBC Goerz - Page 1
Forum section: electronics / testgear

author: perisa
author_rank: Newbie
timestamp: October 08, 2015, 09:48:38 pm
content: Hi,to all members,maybe someone used BBC Goerz Metrawatt Revitester 100thankshttps://www.eevblog.com/forum/Smileys/default/BullshitDetector.gif
Iwatsu SS-7811P vs Hantek DSO5102P - Page 1
Forum section: electronics / testgear

author: bsbnewbie
author_rank: Newbie
timestamp: September 14, 2015, 12:01:22 pm
content: Hello,I am just starting in electronics and looking for an oscilloscope. I have got two options which are roughly in the same price.option 1 - new model Hantek DSO5102P. This is from aliexpress.option 2 - reconditioned unit Iwatsu SS-7811P from local company.Which one I should go for? Thanks!

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: September 14, 2015, 02:16:41 pm
content: Quote from: bsbnewbie on September 14, 2015, 12:01:22 pmDefinitely the Hantek. The Iwatsu is a >20yr old tripple channel analog scope with digital readouts, and while back in the days these were great scopes these days you'd be buying a boat anchor with very little capabilities and which (due to its age) is very likely close to the end of its service life. The Hantek is a modern 2 channel low-end scope but it has decent specs, comes with storage and some decent measurement capabilities, and makes a much better starter scope than the Iwatsu.

author: bsbnewbie
author_rank: Newbie
timestamp: October 09, 2015, 09:01:54 am
content: Thank you Wuerstchenhund!
HP 16702A slow remote X-Session with Ubuntu - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: October 05, 2015, 10:00:18 am
content: Has anyone experienced the same slow connection via remote X-Windows from a HP 16702A to a Ubuntu workstation?Seems Ubuntu doesn't support accelerated remote X-Windows sessions.Tried then with mocaXterm within Windows 8.1...and windows resize is much, much, much faster.....So if you work on a Windows machine, I would highly recommend mocaXterm free edition, faster and much easier to use than Xming or Xcsrv, both I never got it working (o;

author: gslick
author_rank: Frequent Contributor
timestamp: October 06, 2015, 02:58:35 am
content: Have you tried a VNC connection on the same systems for a speed comparison?I used VNC Viewer for Windows 5.2.3 the last time I wanted to remotely connect to a 16700 series logic analyzer. I didn't have any good X Window System server software handy at the time.

author: davorin
author_rank: Unknown
timestamp: October 06, 2015, 05:44:56 am
content: VNC didn't work at all for me....as I think you can't connect to it the normal but the 16702A has to connect to the workstation?

author: gslick
author_rank: Frequent Contributor
timestamp: October 08, 2015, 01:37:36 am
content: Did you try ending the current session and then starting a "Shared session (Web Remote Front Panel)" instead of an "Exclusive session (Console or RemoteX)" before trying a VNC connection?
High end USB test gears recommendation - Page 1
Forum section: electronics / testgear

author: blueskull
author_rank: Unknown
timestamp: October 08, 2015, 02:19:24 am
content: Hi folks,I'm here looking for a set of high end testing gears. I'm a power engineer dealing with 10+MHz next generation power modules (I do a lot of other things, but I design power converters for a living). I need something to:a. Align phases (measure delay in tens or a hundred ps resolution).b. Measure sub ns rising/falling edge.c. Do pre compliance EMI testing on devices I built.d. Measure voltage on shunt resistors, in a range of tens of millivolts.For the above 3 tasks, what tool do I need? For what I can see, a o'scope with ETS up to 20Gsps, a 4GHz+ spectrometer with antennas/LISN and a precision DVM?Since I am paying for my own tools, I own them, so I want to use them at work AND at home, therefore USB virtual equipments are VERY preferred. Hand held devices with a small LCD are also okay, but I still prefer to use USB since I can easily record, capture and automate my work flow.Are there any recommended model numbers? My budget is not very tight, but I don't want to blow my all money either. Let's say, $7000 for ALL 3 of them.Here is my (immature) shipping list:a. Picoscope PS6404C, I seem not to use AWG at all, so additional $1000 is pure waste.b. A cheap 4+GHz spectrometer, definitely NOT a RSA306 or any expensive ones.c. Crappy eBay EM antenna and any open source home built LISN.d. A DIY DVM. I don't care about safety ratings since it will only be measuring <20V including floating voltage. For higher voltage I have a Fluke 289.Any recommendations on a different scope, a spectrum analyzer model number, or a pre-built USB DVM?Thanks,Bo Gao

author: tggzzz
author_rank: Super Contributor
timestamp: October 08, 2015, 08:12:38 am
content: For the oscilloscope ETS will be sufficient, ignore the sample/s specification and concentrate on the analogue bandwidth. The Picoscope PS6404C is 500MHz which should have a risetime of 700ns, which will be degraded by a scope probe (if any). Whether that will be able to align phases to tens of ps will depend on the scope, the trigger source and the scope's triggering mechanism.Be aware that good scope probes are not cheap, nor are good 50ohm terminators/attenuators. If your signal source is not 50ohms, you will probably be able to use "low impedance Z0 probes".
How to connect air supply to weller station - Page 1
Forum section: electronics / testgear

author: seba
author_rank: Newbie
timestamp: October 07, 2015, 05:57:58 pm
content: I got a weller wdd161v second-hand. It has a desoldering iron, but apparently you need to connect an external air supply to the back of the unit.I've got 2 air compressors, but I do not recognize the type of connection that is on the back of the unit. Basically I do not know how to connect my air supply to the unit correctly.Does somebody know how to connect this or has pictures of the connection pieces?

author: Radio Tech
author_rank: Frequent Contributor
timestamp: October 07, 2015, 06:49:26 pm
content: Only google search was this post lol.Can you post a picture of the connection port?

author: Cubdriver
author_rank: Unknown
timestamp: October 07, 2015, 09:25:17 pm
content: I can't find anything on it either. What kind of connection port does it have - male, female, tapered thread?? Are there any other possible model numbers on it that might help identify it? And I'll second the request for a photo.-Pat

author: seba
author_rank: Newbie
timestamp: October 07, 2015, 09:44:15 pm
content: Okay, here's a picture.The left port has an indicator that it is for the air supply. No idea what the right port is supposed to be, but maybe it is also usable as air supply.

author: kingofkya
author_rank: Regular Contributor
timestamp: October 07, 2015, 10:02:31 pm
content: IT looks like those connector 3d printers use for pfte quick connect type.Google for "air fittings ptfe"

author: haveissues
author_rank: Contributor
timestamp: October 07, 2015, 10:16:25 pm
content: No idea what the fitting on the right is, but the left one just uses a semi rigid hose of the correct diameter to connect directly to it. Just push it in an done. To disconnect, press in the blue plastic ring while pushing the hose in and then pull out while still holding the ring.

author: haveissues
author_rank: Contributor
timestamp: October 07, 2015, 10:19:16 pm
content: I think they are similar to this:http://www.use-enco.com/CGI/INPDFF?PMPAGE=1047&PMCTLG=00

author: nanofrog
author_rank: Super Contributor
timestamp: October 07, 2015, 11:01:18 pm
content: Left port is aFesto Push-In Connector. The number molded into the blue plastic collar is the OD size of the semi-rigid tubing in millimeters (6mm in this case). Right port is the air exhaust.
non-original USB cables for multimeters - Page 1
Forum section: electronics / testgear

author: mmx_4
author_rank: Newbie
timestamp: October 06, 2015, 03:35:56 pm
content: Anyone know about cheap/non-original USB/rs-232 cables for Brymen multimeters ?May be, cheap cables for Uni-T can be modified and used for Brymen ?

author: Muttley Snickers
author_rank: Unknown
timestamp: October 06, 2015, 09:02:13 pm
content: I dont have a Brymen to test yet but do have a couple of Unitrends (UnitT), these links below may assist in your quest and there may also be other alternatives that I am not aware of.Muttleyhttps://www.eevblog.com/forum/testgear/brymen-ir-connection-protocol-anyone-sniffed-it-yet/http://sigrok.org/wiki/Supported_hardware#Multimeters
Fluke 45 with UNCAL fault (Error 7) - Page 1
Forum section: electronics / testgear

author: SimonPbr
author_rank: Newbie
timestamp: October 06, 2015, 01:16:05 pm
content: Hi everyone,I'm eyeballing a Fluke 45 that is in an alright condition besides that it shows "error 7" upon startup and "uncal" when running. Now I checked and the manual describes this as problems with reading calibration data from the eeprom. As it would be about 100 €, my question is, is it worth it, or is it even more expensive to calibrate and/or troubleshoot the device? I've been looking for a bench multimeter for quite some time and heard only good about the Fluke 45, that's why it caught my interest.I'm happy for any opinions!Simon

author: commongrounder
author_rank: Frequent Contributor
timestamp: October 06, 2015, 01:30:48 pm
content: Here in the USA, a good condition, working, Fluke 45 can be had for around $150.00-200.00 US. I don't know what the additional costs would be to import one to your country, but if I saw that particular unit here, I would pass on it. Sounds like the eeprom is corrupted, and calibration costs would be substantial once the original problem was repaired.

author: SimonPbr
author_rank: Newbie
timestamp: October 06, 2015, 02:46:39 pm
content: Thanks for the reply! Very much appreciated.. I will keep my eyes open for better options
Teardown of the ESI 585K multimeter? - Page 1
Forum section: electronics / testgear

author: GeekPriest
author_rank: Contributor
timestamp: October 06, 2015, 08:50:14 pm
content: My latest issue of Family Handyman is suggesting the ESI 585K multimeter as a good choice for household and automotive work. It's $88 at Amazon (http://www.amazon.com/ESI-585K-Deluxe-Automotive-DMM/dp/B000JFHMR0). For that price, compared to the appearance of the thing, I'm skeptical.Has anyone torn one down? Any idea of the real manufacturer?GP

author: MartinX
author_rank: Regular Contributor
timestamp: October 06, 2015, 09:30:09 pm
content: The case and the display and the knob looks like my old Mastech multimeter, the MY series looked just like that.
Array 3720A load failure? - Page 1
Forum section: electronics / testgear

author: MudMan
author_rank: Contributor
timestamp: October 04, 2015, 07:23:42 pm
content: I have a problem with my Array 3720A electronic load. When I measure, without anything connected to the inputs of the load, between the mains ground (i.e. shield of Trigger Input BNC-Connector) and minus input of the load, I measure a voltage of 8.9 volts AC with an offset of 10.2 volts DC. If I connect a power supply with a grounded minus, or only a wire between mains ground and minus input, a huge current (> 8 Amps) will flow and the mains fuse of the load will blow!I this a bug or an "normal" behavior of this load. The load will work normally if the inputs are not grounded.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: October 04, 2015, 11:23:07 pm
content: Have you tried contacting their customer service? I have had great results with Array customer service.Sent from my LG-ls990 using Tapatalk

author: MudMan
author_rank: Contributor
timestamp: October 05, 2015, 02:58:41 pm
content: Quote from: PedroDaGr8 on October 04, 2015, 11:23:07 pmDid you mean scott@array.sh?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: October 05, 2015, 11:41:42 pm
content: Quote from: MudMan on October 05, 2015, 02:58:41 pmI don't remember the exact email address but it was Scott Zhang who helped me out. He sent me some parts to repair my array PSU free-of-charge. Mind you, these were from abuse by a previous person, not the fault of Array. Someone had broken off the banana plugs and he sent some replacements to me.
Is it possible to test the 200mhz hantek hack via uart before modifying flash? - Page 1
Forum section: electronics / testgear

author: snoop911
author_rank: Newbie
timestamp: October 06, 2015, 01:35:40 am
content: I read Tinhead's awesome post,https://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg21170/#msg21170Since my Hantek DSO5102P is coming fresh off the factory production line, I'd like to minimize the risk of bricking it, by opening it and testing the 200mhz hack via the uart first, without touching the flash/Tools_P_models.zip.Has anyone tried testing the 200mhz change via uart only? Or is it something that only works if you do the flash folder name change ( /dst1102b to /dst1202b)Thanks!
Victor 86E & VC9807A+ multimeter - Page 1
Forum section: electronics / testgear

author: Arhammon
author_rank: Contributor
timestamp: October 05, 2015, 10:26:52 am
content: Hi! I have made some videos about my Victor multimeters. You can see what's inside.Unfortunately videos are in Russian, but electronics is international!Victor 86E:DCV, ohms measurement:https://youtu.be/Wdu3qMmQrz0?t=5m7sInternals:https://youtu.be/NVemYowSrPIOverview:- Not have high voltage protection, and place for it.- Small fuse- AVG AC+ isolated USB from box.Medium accuracy- Not have REL button from box.+ Temperature measurement.VC9807A+(9806 similar):DCV, ohms, cap measurement:https://youtu.be/mI7zogPAnE4?t=1m39sInternals:https://youtu.be/9fP02oy6dWY?t=1m2sOverview:- No high voltage protection, and place for it.- Only 1PTC and current range protection (small fuse)TRMS, but only 1kHz+ Excellent accuracy of my multimeter.Digital calibration.Manual range.- Not have REL button (may be modable, but I don’t find datasheet for main IC).

author: Wytnucls
author_rank: Super Contributor
timestamp: October 05, 2015, 01:22:27 pm
content: Spasibo.Can't say I understood much of it, but nice videos anyway.One of the best Victor meters (86E). Quality is improving, at last.Do you know what the open voltage is on diode measurement?Do vstre4i.PS: They also sell a new 4 1/2 bench meter that doesn't look too bad. No info on price yet:http://www.china-victor.com/english/en/product_data.aspx?ClassID=196&ID=384

author: Arhammon
author_rank: Contributor
timestamp: October 05, 2015, 04:18:23 pm
content: Diode measurement voltage is 3V for 86, 3,2V for 9807I saw price in Chinese site. Model VICTOR 8245(not A) cost about 200$http://www.china-victor.com/cn/Product_Data.aspx?ClassID=173&ID=299Victor’s English site gives not very actual information.
B7-50 multimeter from made in Russia in 1993 - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: October 04, 2015, 09:44:51 pm
content: I found thesephotoson Ebay. It is inspired by 80's Fluke design, like Fluke 8020A introduced in 1977.

author: Hydrawerk
author_rank: Super Contributor
timestamp: October 04, 2015, 09:47:18 pm
content: Now what is that glass tube part? Is it a crystal or a precise resistor?

author: JoeB83
author_rank: Regular Contributor
timestamp: October 04, 2015, 09:51:39 pm
content: Really interesting, thanks for sharing. I love Soviet-era (& early 90's Russian) products, they're interesting to me.As for the glass tube, maybe a fuse or something? It kinda looks like a neon bulb, too, but I don't know what it'd be doing in a multimeter.Thanks for sharing!

author: wraper
author_rank: Unknown
timestamp: October 04, 2015, 10:02:57 pm
content: Quote from: Hydrawerk on October 04, 2015, 09:47:18 pmLooks like crystal, there should be a rectangle die inside. BTW IC is a clone of ICL7106 which was made on Alfa factory (no longer exists) in Riga, few km away from me.

author: crispy_tofu
author_rank: Super Contributor
timestamp: October 04, 2015, 10:21:45 pm
content: Wow, thanks for sharing!Interesting to see multimeters like this.

author: Vgkid
author_rank: Super Contributor
timestamp: October 04, 2015, 10:51:37 pm
content: Thanks for the pixs. I believe the glass tube is a crystal. Several are floating around on ebay.
DS815 Usage Question - Page 1
Forum section: electronics / testgear

author: josephny
author_rank: Contributor
timestamp: October 04, 2015, 11:43:42 am
content: Hello,I'm considering getting a Rigol DS815 for repeater maintenance.I know it will allow me to tune filters/cavities, but I'm wondering if anyone knows how to use it to test receiver sensitivity?Will I be cussing about not being able to check for xyz to get the repeater working as well as possible?Thank you,Joseph

author: longview
author_rank: Contributor
timestamp: October 04, 2015, 05:12:28 pm
content: Currently the DSA815 has some frequency accuracy issues when using the tracking generator - a few kHz typically - just FIY. Depending on how narrow your filters are you might need to offset-tune them a bit.A spectrum analyzer with tracking isn't very useful for testing sensitivity, I've tried. The tracking generator is potentially useful as a signal generator but it can't be modulated in any meaningful way and the output level can only go down to -20 dBm.If you had a few high quality step attenuators it could sort of work, but with no modulation it's hard to judge real life sensitivity. There's no substitute for an old school RF signal generator.The HP 8656B can be had fairly cheaply compared to the DSA815, and many sellers offer warranties on them. I just got a Fluke 6060B a few days ago and it's pretty good too.They're not hugely portable though, so if you wanted to do field work then my best suggestion is a HT with a pile of attenuators (130 dB or so).
reed clamp meter - Page 1
Forum section: electronics / testgear

author: andre carignan
author_rank: Newbie
timestamp: October 04, 2015, 05:55:08 pm
content: hi i just bought a new reed r5030 clamp meter and i am quite impress with it, as anyone check the accuracy on that brand of meter until now the amp and ohm reading seem's to be quite accurate. I don't have a the best equipment to test them but comparing the readout with my fluke 321 the reading are consistently the same a tare down and testing of this meter would be interesting

author: retiredcaps
author_rank: Super Contributor
timestamp: October 04, 2015, 08:38:18 pm
content: Your Reed clamp meter is made by CEM Instruments. A variation or updated version of this modelhttp://www.cem-instruments.com/en/pro/pro-513.htmlhttp://www.cem-instruments.com/en/UploadFile/20110307175624114.gifIt will be interesting to see what the solder quality looks like on the inside. CEM Instruments has very poor soldering processes in their factories as evidenced by multimeter teardowns shown here. Maybe the clamp meter will be better?
RE: Programmable DC Electronic load - Page 1
Forum section: electronics / testgear

author: Jayy
author_rank: Contributor
timestamp: October 05, 2015, 05:25:01 am
content: Hi,I would like to buy Programmable DC Electronic load for R&D and general purpose electronics.I have attached datasheet. please take a look and tell me if this model is any good.it does not have CV and how important is that.Thanks and Regards,Jai.

author: Electro Fan
author_rank: Super Contributor
timestamp: October 05, 2015, 06:11:11 am
content: It looks pretty similar to the Atten and maybe the Array 3700 series Electronic Loads. You can search here on Atten, Array, and also Maynuo and BK Precision Electronic Loads. You'll see a fair amount of discussion; I think there are other users here with the Atten and Array versions. Here is a thread that might get you started:https://www.eevblog.com/forum/testgear/array-electronic-loads/msg378306/#msg378306

author: Jayy
author_rank: Contributor
timestamp: October 05, 2015, 06:16:20 am
content: Hi,Thanks for the reply.how important is CV (constant voltage) feature.Regards,Jai.

author: Electro Fan
author_rank: Super Contributor
timestamp: October 05, 2015, 06:20:23 am
content: I think constant voltage might be a pretty worthy feature but you'll get lots of guidance on that and more shortly....I just came across this - you might enjoy it:Definitely take a look at Maynuo too.Welcome to EEVblogPS, saw this in case it is of any help:https://www.eevblog.com/forum/beginners/dc-electronic-loads-cv-cc-cr-help-me-to-understand-better/msg310777/#msg310777
Current Accuracy Verification - Page 1
Forum section: electronics / testgear

author: ocw
author_rank: Regular Contributor
timestamp: October 03, 2015, 11:04:03 pm
content: While evaluating meters I'd prefer current measurement tests to at least also include the effects of the meter's shunt resistance. For myself, accuracy on the measurement of a current source occasionally is useful, but I more commonly measure currents where the series resistance provided by the meter's shunt resistance is important. If the effect of the meter's shunt resistance is not included with a review and only accurate current source readings are shown, the manufacturers have less reason to try and reduce their shunt resistance.Attached is my meter accuracy verification on two lower price meters: The Mastech MS8218 and the UT61E. I added the low price UT210 to show the low current measurement accuracy of a clamp sense current meter for comparison. It has its limitations, but is useful for some applications.As an example of how a current source reading can be meaningless, look at the UT61E's measurement of about a 0.25 amp current. Correcting for the added series resistance (equivalent to a current source measurement) it had +0.03% accuracy. However, the actual reading which the meter indicated was more than 33% low! What's the value of that current source accuracy? Yes, in this case the accuracy can be improved via a measurement in the A position rather than the mA position used for the reading (at the price of less resolution), but why is that even possible? Let's see those figures in a review!My current measurements were taken using an accurately measured voltage and mostly 0.01% accuracy resistors. I recently obtained a Vishay Y092610R0000T9L 10 ohm 8 watt 0.01% resistor to help take some higher current readings. It has four leads for the current wires to be connected at the extremes with separate terminals for voltage readings. That can help minimize any wire loss limiting accuracy. But, it's not a cheap part: currently $36.76 from Mouser.Some things on the attachment are not fully explained, but most should be understood.
HP 34401A malfunction - Page 1
Forum section: electronics / testgear

author: jmoreland79
author_rank: Regular Contributor
timestamp: September 30, 2015, 06:44:19 pm
content: I have an HP 34401A that has an issue measuring AC voltage. With voltage applied, the display freezes and does not display the actual voltage. Other measurements (DCV, resistance, continuity, etc.) seem to be read ok.I figure something is fried inside, but I'm wondering if it's something that's easily repairable or I should just send it out for repair. The unit was last calibrated in February 2015.

author: jitter
author_rank: Frequent Contributor
timestamp: September 30, 2015, 07:31:40 pm
content: Have you tried running the self tests?If not, press the shift-button and power it on, release the shift-button after a few seconds and the self tests should start.I wonder if that comes up with an errorr code.

author: jmoreland79
author_rank: Regular Contributor
timestamp: September 30, 2015, 08:47:33 pm
content: Thanks, I had not run those tests but I did and everything passed.Hmm, not sure what's going on with it.

author: bitseeker
author_rank: Super Contributor
timestamp: September 30, 2015, 09:57:21 pm
content: Does using the rear inputs work normally? Does the problem occur in manual ranging mode? Does it happen at all ranges while in manual mode?

author: sarepairman2
author_rank: Frequent Contributor
timestamp: October 01, 2015, 03:38:08 am
content: this thread title = nightmare situation

author: jmoreland79
author_rank: Regular Contributor
timestamp: October 01, 2015, 02:37:58 pm
content: The rear inputs give the same results.However, it seems the issue only appears when trying to take a high frequency (165V 110kHz). Measuring mains voltages (120-277, 60 HZ) seems to be fine.

author: bitseeker
author_rank: Super Contributor
timestamp: October 02, 2015, 12:01:51 am
content: That's odd. Should be OK up to 300kHz.

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: October 02, 2015, 12:54:08 am
content: If you have a signal generator, you can test if it is frequency dependent if you haven't tried it already.
Want to buy the DS1054Z - Page 1
Forum section: electronics / testgear

author: TestGeek
author_rank: Newbie
timestamp: October 01, 2015, 01:13:06 pm
content: Hello,Looking to buy the above scope, seen online that both Rigol UK and MCS Test Equipment both have it in stock, where is the best place to buy it from?Thanks

author: Daniel_Reyes
author_rank: Regular Contributor
timestamp: October 01, 2015, 01:27:03 pm
content: Just bought one last night from tequipment.net free shipping in u.s. and 6 percent discount to eevblog membersSent from my SM-G900P using Tapatalk

author: TestGeek
author_rank: Newbie
timestamp: October 01, 2015, 01:29:11 pm
content: Thanks Daniel,I'm based in the UK though and both the companies i mentioned offer free shipping. Just wondering if anyone has had any dealings with them before i buy

author: krivx
author_rank: Frequent Contributor
timestamp: October 01, 2015, 01:30:40 pm
content: I bought from Batterfly, it was cheapest in the EU at the time.

author: Howardlong
author_rank: Super Contributor
timestamp: October 01, 2015, 01:40:16 pm
content: I haven't dealt with MCS but FWIW I am UK based and have used both Rigol UK (aka Telonic) and Lambda Photonics, both good, however I would call first in any case to confirm stock before ordering online (ISTR you can save a few quid by ordering online).

author: BillyD
author_rank: Regular Contributor
timestamp: October 01, 2015, 01:53:04 pm
content: You may also want to consider Batronix, based in Germany.They're quite competitive and reliable.

author: 6581
author_rank: Unknown
timestamp: October 01, 2015, 03:05:45 pm
content: Quote from: BillyD on October 01, 2015, 01:53:04 pmVery quick delivery and free shipping (for over 200€ order I believe.) Recommended.

author: Fungus
author_rank: Super Contributor
timestamp: October 01, 2015, 03:22:06 pm
content: Quote from: BillyD on October 01, 2015, 01:53:04 pmI live in Spain. I got mine from Batronix.I've also bought stuff from Batterfly in Italy. Take your pick.

author: mauroh
author_rank: Frequent Contributor
timestamp: October 01, 2015, 03:32:09 pm
content: Batterly 327,95€Batronix 339,00€I bought if from BatterflyMauro

author: drws
author_rank: Unknown
timestamp: October 01, 2015, 04:51:12 pm
content: I've got a few bits from RigolUK, no complaints, good service.They (as I'm sure others might do) made sure it had the latest firmware installed and tested before shipping.Got some other Rigol kit from Lambda Photo which were ok when they arrived but their site indicated they were in stock whereas they weren't. They kept in touch and were nice enough to not charge postage because of the delay.

author: Mark
author_rank: Frequent Contributor
timestamp: October 01, 2015, 06:08:45 pm
content: I bought my two DS1054Z's from Batronix and a DSA815-TG from them as well, no problems and fast delivery. I've also dealt with Telonic UK this year and they were equally good, I will probably use them for future purchases.