Re: [volt-nuts] Calibration Sources for Solartron 7081
I made it through the DC Cal steps this evening and I was reading about the Ohms calibration. What resistance standards are needed? 1 ohms and 1000 ohms? 4 wire or 2? Thanks, Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Jean-Louis Noel Sent: Friday, June 22, 2012 9:25 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Calibration Sources for Solartron 7081 Hi J. L. From: "J. L. Trantham" > However, AC promises to be a problem. I guess I will try using a > signal generator and an amplifier to see what output level and > stability I can achieve. You have to link the amplifier to your DC standard to have the stability needed. > But still, what frequency? 60 Hz? 1 kHz? The 'basic' calibration is usually performed at 400Hz. With check at higher frequencies (40KHz and 400KHz for the 7081) to know if it's still properly compensated. Bye, Jean-Louis ___ 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] Calibration Sources for Solartron 7081
Hi J. L. From: "J. L. Trantham" However, AC promises to be a problem. I guess I will try using a signal generator and an amplifier to see what output level and stability I can achieve. You have to link the amplifier to your DC standard to have the stability needed. But still, what frequency? 60 Hz? 1 kHz? The 'basic' calibration is usually performed at 400Hz. With check at higher frequencies (40KHz and 400KHz for the 7081) to know if it's still properly compensated. Bye, Jean-Louis ___ 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] Calibration Sources for Solartron 7081
Jean-Louis, My DC standards are a Fluke 731B and Fluke 335A DC Voltage Standards and an EDC CR103 DC Current and Voltage Standard. My resistance standards consist of a collection of Leeds and Northrup type standard resistors as well as a collection of General Radio Decade Resistance boxes that will get me up into the MegOhm range. However, AC promises to be a problem. I guess I will try using a signal generator and an amplifier to see what output level and stability I can achieve. But still, what frequency? 60 Hz? 1 kHz? Thanks, Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Jean-Louis Noel Sent: Friday, June 22, 2012 3:58 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Calibration Sources for Solartron 7081 Hi J. L. From: "J. L. Trantham" > What source could/should I use for the ACV and what frequency for the > ACV? I can come up with a power transformer and a variac for 60 Hz. The stability is not high enough to be useful! Have a look to http://www.on4jln.be/infos/getfile?file=515A-OM.pdf, it is the Fluke 515A, to learn how they dealt with that problem. If your 10V is good you will get better results too. And it needs to be very good to calibrate the 7081! Stability is more important than everything else and that is the problem. Have a good day. Bye, Jean-Louis ___ 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] Calibration Sources for Solartron 7081
Hi J. L. From: "J. L. Trantham" What source could/should I use for the ACV and what frequency for the ACV? I can come up with a power transformer and a variac for 60 Hz. The stability is not high enough to be useful! Have a look to http://www.on4jln.be/infos/getfile?file=515A-OM.pdf, it is the Fluke 515A, to learn how they dealt with that problem. If your 10V is good you will get better results too. And it needs to be very good to calibrate the 7081! Stability is more important than everything else and that is the problem. Have a good day. Bye, Jean-Louis ___ 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] Calibration Sources for Solartron 7081
I recently added another Solartron 7081 to my collection that seems to be working correctly, is stable and I have upgraded it to the latest firmware. However, it is clearly not accurate, at least on the 10 VDC scale, measuring my 10.000 000 standard at about 10.000 840 V while my other meters are +/- about 10 uV of 10.000 000 VDC. If I understand the calibration procedure correctly, I will need an input short, an input open, and 'standards' for each of the VDC, VAC, and Ohms ranges to perform a complete calibration procedure. This would appear to be a source for 0.1, 1, 10, 100, and 1000 VDC and VAC along with 0.1, 1, 10, 100, and 1000 kOhm and 10 and 1000 MOhm resistor standards. I can come up with the VDC standards and the resistance standards except the 1000 MOhm. I don't have 'standards' but I have references that are stable and calibrated meters (another 7081 and two 3458A's) that I can use to measure my references and then input their measurements into the DUT 7081 to perform the calibrations. My questions are: What source could/should I use for the ACV and what frequency for the ACV? I can come up with a power transformer and a variac for 60 Hz. I also have a selection of signal generators and synthesizers for amplitudes up to about +10 dBm at pretty much any frequency you prefer. What would be the lowest ACV that I could/should use for the 1000 VAC scale? What suggestions for the 1000 MOhm standard? What is the lowest value that I could/should use for the 1000 MOhm scale? My plan is to test each scale against my other meters and calibrate only the scales that are 'out of bounds'. Good idea or bad? Thanks in advance. Joe ___ 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.
