[volt-nuts] (no subject)
I just had a friend buy this for me (I don't have an ebay account). I hope I didn't make a mistake. http://www.ebay.com/itm/Electronic-Development-Corporation-EDC-VS330-VOLTAGE-STANDARD-/161069656213?nma=truesi=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253Dorig_cvip=truert=nc_trksid=p2047675.l2557 Of course, once I have it, it's the chicken and egg problem. The best I have to check it against is an HP 3478A that was last calibrated an unknown number of years ago. It has a little round sticker over the CAL switch on the front, but no dated calibration label that I can see. It came from a repair facility that closed a few years ago. Actually, the reason I was tempted to buy the VS330 was because I think the 3478A is off a bit. A while back, I built a simple 5V reference with a MAX6350. The 3478A read high. I took the reference to work and the best Fluke handheld we have was dead on (I don't remember the model right now). I made the measurement again last night and the 3478A reads 5.0026 V, with the last digit fluctuating. Room temperature was 26 C. I guess obsessing about these things has brought me here to the Volt Nuts. I have been on Time Nuts for several years. Joe Gray W5JG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] Fwd: Old resistors
They can be useful to test power supplies, at least the lower value ones. This one looks fairly high value (small wire) so probably useless unless you have a museum. Didier KO4BB Joseph Gray jg...@zianet.com wrote: I know someone who has several of these old style resistors. Can anyone tell me anything about them? Are they of any use? https://dl.dropboxusercontent.com/u/19599147/Resistor%20-%20side.jpg https://dl.dropboxusercontent.com/u/19599147/Resistor%20-%20front.jpg Joe Gray W5JG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] What really gets calibrated?
I recently had it explained to me that calibration is really just checking a piece of gear against a known standard, to see if it meets the manufacturers specification. If it is outside specified values, then it gets adjusted, not calibrated. I can see that on the part of the calibration lab, it is easier and faster to simply check that a device meets spec and not have to spend time adjusting anything. It should also be less expensive for the customer. My question is, is just meeting spec good enough? If an instrument is capable of exceeding spec, shouldn't it be adjusted to the best standard available? In other words, if spec says 2 ppm, but it can be adjusted to 1 ppm, wouldn't you want to do that? Joe Gray W5JG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] (no subject)
Can you get a service/calibration manual for it? I just sent my HP3457A out for calibration. $150 Tom - Original Message - From: Joseph Gray jg...@zianet.com To: volt-nuts@febo.com Sent: Sunday, July 28, 2013 5:05 PM Subject: [volt-nuts] (no subject) I just had a friend buy this for me (I don't have an ebay account). I hope I didn't make a mistake. http://www.ebay.com/itm/Electronic-Development-Corporation-EDC-VS330-VOLTAGE-STANDARD-/161069656213?nma=truesi=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253Dorig_cvip=truert=nc_trksid=p2047675.l2557 Of course, once I have it, it's the chicken and egg problem. The best I have to check it against is an HP 3478A that was last calibrated an unknown number of years ago. It has a little round sticker over the CAL switch on the front, but no dated calibration label that I can see. It came from a repair facility that closed a few years ago. Actually, the reason I was tempted to buy the VS330 was because I think the 3478A is off a bit. A while back, I built a simple 5V reference with a MAX6350. The 3478A read high. I took the reference to work and the best Fluke handheld we have was dead on (I don't remember the model right now). I made the measurement again last night and the 3478A reads 5.0026 V, with the last digit fluctuating. Room temperature was 26 C. I guess obsessing about these things has brought me here to the Volt Nuts. I have been on Time Nuts for several years. Joe Gray W5JG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] EDC VS330 Voltage Standard
Same issue as with the time-nuts and the man with one watch versus more. No way to tell except to 'vote with the majority'. So, the answer is 'probably'. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, July 28, 2013 6:37 PM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] EDC VS330 Voltage Standard When I get the VS330, I think I'll first try setting it for 5 V and comparing the 3478A reading with what I got with the MAX6350. If I get about the same reading of 5.0026 V, is it safe to assume that the 3478A is in error? Joe Gray W5JG On Sun, Jul 28, 2013 at 5:02 PM, Joseph Gray jg...@zianet.com wrote: Thanks for the subject. Actually, I had intended to put that exact subject on it, but forgot and clicked send. I couldn't find even a partial manual for the VS330, but the 1030A partial manual looks like it would be very similar. Would you please send me the email contact at K-H that sent you the manual? Joe Gray W5JG On Sun, Jul 28, 2013 at 4:11 PM, J. L. Trantham jlt...@att.net wrote: Joe, Pardon my adding a 'subject' to the thread. If all you want is a 'house standard', you're probably 'in the ball park'. If you want to set up a home 'metrology lab' (careful, this 'metrology' stuff can be as addicting as the 'time' stuff), you should get something calibrated by an outside lab. I would send the highest resolution meter out for cal. I don't know if calibration services are available for the VS330. If the 3478A is it, I would vote to send the 3478A to Agilent for their 'Agilent' cal ($204.22 per their website) and see where you are. The meters I have sent to Agilent for their 'Agilent' cal, come back with 'as found' and 'as left' values and is very informative about the capabilities of the meters. The meters I have returned for a repeat 'Agilent' cal have all returned with their 'as found' values still in cal. Once you get the 3478A back, you will have a number of 'calibrated' measurement capabilities. Do you have a manual? I have an EDC CR103 voltage and current standard and was able to find a 'partial' manual on the web. It noted that a complete manual was available from Krohn-Hite and to contact them at (508) 508-1660 or sa...@krohn-hite.com to purchase a complete manual. When I emailed them about obtaining one, I received a complete .PDF manual by return email from one of their service engineers. Others have had a similar experience. When asked, Krohn-Hite asked that the manuals not be 'shared'. So, if you can't find one, you might try contacting them. Good luck. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, July 28, 2013 4:06 PM To: volt-nuts@febo.com Subject: [volt-nuts] (no subject) I just had a friend buy this for me (I don't have an ebay account). I hope I didn't make a mistake. http://www.ebay.com/itm/Electronic-Development-Corporation-EDC-VS330- VOLTAGE -STANDARD-/161069656213?nma=truesi=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253D orig_cv ip=truert=nc_trksid=p2047675.l2557http://www.ebay.com/itm/Electron ic-Development-Corporation-EDC-VS330-VOLTAGE-STANDARD-/161069656213?n ma=truesi=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253Dorig_cvip=truert=nc_trk sid=p2047675.l2557 Of course, once I have it, it's the chicken and egg problem. The best I have to check it against is an HP 3478A that was last calibrated an unknown number of years ago. It has a little round sticker over the CAL switch on the front, but no dated calibration label that I can see. It came from a repair facility that closed a few years ago. Actually, the reason I was tempted to buy the VS330 was because I think the 3478A is off a bit. A while back, I built a simple 5V reference with a MAX6350. The 3478A read high. I took the reference to work and the best Fluke handheld we have was dead on (I don't remember the model right now). I made the measurement again last night and the 3478A reads 5.0026 V, with the last digit fluctuating. Room temperature was 26 C. I guess obsessing about these things has brought me here to the Volt Nuts. I have been on Time Nuts for several years. Joe Gray W5JG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] Cal labs
I found that there are at least two cal labs in El Paso, which is reasonably close to me. One, Techmaster Electronics has pricing listed (I hate it when everyone says contact us for a quote). The other is MetroCal, which lists no information at all. Has anyone used either of these companies? What is your opinion? For a 3478A, Techmaster lists the following prices: ISO 9001 = $50 Z540 = $175 ISO 17025 = $275 Now, I realize that these are various standards. Without me having to read reams of standards documents, can someone tell me briefly what the difference is and which of these do I need as a hobbyist and potential volt nut? Also, they have a column heading of Level and for the 3478A, it lists level 4. What does this mean? They also list the EDC MV106, starting at $100. I'll have to contact them about the EDC VS330. Boy, just what I needed. Another hobby that costs money :-) Joe Gray W5JG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] (no subject)
On 07/28/2013 04:56 PM, Tom Miller wrote: Can you get a service/calibration manual for it? I just sent my HP3457A out for calibration. $150 Hi Tom, May I ask where you had this done? It seems like a reasonable charge. What documentation did they return with the unit? Thanks, (another 3457A owner (actually three)) -- Bob Smither, PhD Circuit Concepts, Inc. = Blessed is he who expects no gratitude, for he shall not be disappointed. -- W. C. Bennett = smit...@c-c-i.com http://www.C-C-I.Com 281-331-2744(office) -4616(fax) attachment: smither.vcf___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] (no subject)
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Re: [volt-nuts] (no subject)
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Re: [volt-nuts] (no subject)
Three empty messages! Cat sitting on keyboard? On Sun, Jul 28, 2013 at 7:31 PM, wb6bnq wb6...@cox.net wrote: ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] (no subject)
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Re: [volt-nuts] (no subject)
At least the subject is correct :) - Original Message - From: Orin Eman orin.e...@gmail.com To: Discussion of precise voltage measurement volt-nuts@febo.com Sent: Sunday, July 28, 2013 10:34 PM Subject: Re: [volt-nuts] (no subject) Three empty messages! Cat sitting on keyboard? On Sun, Jul 28, 2013 at 7:31 PM, wb6bnq wb6...@cox.net wrote: ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
