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| 7.5 digit bench DMMs comparison |
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| ebclr:
Do i also need a temperature and humidity controlled room in my home to do this high level hobby, perhaps some transfers standards, Sorry this isn't hobby this is NIST research department |
| tautech:
--- Quote from: TiN on September 26, 2016, 06:17:47 pm ---ebclr High resolution DAC/ADC testing, voltage references design and experimenting, ratiometric measurements (e.g. bridges, comparators). How these areas fill into home hobby? Well, that's a question outside of the choosing DMM here. It's often not resolution what justify such instruments, but their stability and accuracy. But that's only if 7.5/8.5 meter is tested and calibrated. Otherwise calibrated 6.5-digit meter in such cases often provide better accuracy than uncalibrated unknown 8.5-digit one. --- End quote --- Quite so. I hear Chinese whispers a 6.5 digit model is not too far from the marketplace. |
| HighVoltage:
--- Quote from: ebclr on September 26, 2016, 06:22:54 pm ---Do i also need a temperature and humidity controlled room in my home to do this high level hobby, perhaps some transfers standards, Sorry this isn't hobby this is NIST research department --- End quote --- Well, a 7 1/2 digit multimeter will give you some good resolution for temperature measurement. My new Keithley DMM7510 shows 4 digits after the decimal point. I had a very good Fluke probe sitting in a bottle of water that was at equilibrium with the room temperature for a few days already. The probe needed some hours to settle until only the last digit fluctuated. Then I took a LED flashlight from about 1 m away and pointed it at the PT100 sensor inside the water bottle And the last digit started to climb Pretty amazing to see this. Here is a first screen shot, just figured out to use HOME and ENTER simultaneous to get a screen shot to the USB stick. (Why can the Keysight 34470A not have this cool feature) |
| Dwaine:
--- Quote from: HighVoltage on September 26, 2016, 07:13:25 pm --- --- Quote from: ebclr on September 26, 2016, 06:22:54 pm ---Do i also need a temperature and humidity controlled room in my home to do this high level hobby, perhaps some transfers standards, Sorry this isn't hobby this is NIST research department --- End quote --- Well, a 7 1/2 digit multimeter will give you some good resolution for temperature measurement. My new Keithley DMM7510 shows 4 digits after the decimal point. I had a very good Fluke probe sitting in a bottle of water that was at equilibrium with the room temperature for a few days already. The probe needed some hours to settle until only the last digit fluctuated. Then I took a LED flashlight from about 1 m away and pointed it at the PT100 sensor inside the water bottle And the last digit started to climb Pretty amazing to see this. Here is a first screen shot, just figured out to use HOME and ENTER simultaneous to get a screen shot to the USB stick. (Why can the Keysight 34470A not have this cool feature) --- End quote --- Stop it.... I'm drooling..... Every hobby Lab should have a DMM7510..... |
| ebclr:
Based on the resolution of the temperate you are reading I assume you are using a quantum mechanics sensor otherwise all those digits except the first 2 is a lot on nonsense number |
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