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Re: 3457A and other meter low resistance tips?
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You can never have too many meters. It's like your wife's shoes.
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However, you need to pick one of the litter to send to whomever for a formal calibration. I opt for sending them to their respective manufacturers. That's why I think you should send the 3457A to Agilent. You will get the 'before' and 'after' data that will either give you great confidence in the meter or shake your faith to the core, until you send it back to Agilent in a year for another round of 'before' and 'after' data. I have two HP 3458A's and two Solartron 7081's that have been to their respective manufacturers (HP and Ametek, twice for the Solartrons) for calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V, they are within about 15 uV of each other and quite close to 10.000000 VDC. Therefore, I conclude that the 731B is 'accurate' and the meters are calibrated. I don't think I can get any closer than that without building my own environmental facility and reference. Not likely as a hobby. However, I now have the 'tools' to do a good calibration of some HP 432A power meters and their calibrators plus a load of other items. Enjoy!!!!!! And I hope you get to see your family from time to time. :^) Joe -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Jeff Machesky Sent: Sunday, January 06, 2013 7:04 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance tips? Too funny. Well I've already got 5 meters of decent quality and I'm looking for more. It's also sad when I'm building up power supplies to get 1000v DC and 1000V AC at various frequencies to calibrate items like the DMM on my 2465BDM. I don't need 1000, buy hey I figured I may as well have overhead. Think those little gator clip wires from ebay are safe at 1000v, lol. I've already managed to kill 1000 piv rated diodes. I also partake in the crazy practice of joining my fixed 1000v supply with my 30 volt isolated lab supply to tweak to precise high voltages. Pretty stupid practice..but someones got to do it. The only saving grace is the current is at least limited to about 100ma..not that it would save me. I have the dilemma that if I get a calibrated voltage reference and it disagrees with the 3457A then I'll naturally have to do one of two things. Send it off to Agilent to get the meter calibrated, or self calibrate so the 3457A agrees with my reference. The ladder has the advantage of not having a reference around that disagrees with the meter. If I send it off to Agilent I'll always question who was right, did the tech do a sloppy job..etc..etc. Ohh and the ranges also have to exactly agree with each other or it's back for calibration. Surprisingly they do now. Insanity is doing the same thing over and over and expecting different results. Wonder how that plays in with calibration. Jeff On 1/6/2013 5:02 PM, Don Black wrote:
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