I uploaded this to the xdevs ftp server, directory svgeesus:
Operator: Chris Lilley (svgeesus)
Date: 10 Nov 2018
DUT: US Cal Club 2 PX reference
Type 1b: Direct measurement, calibrated equipment (in 1 year spec or better)
DMM: Keysight 34465A, instrument ID 869657
Cal date: 28 Nov 2017
Cal type: Accredited 17025 with uncertainties
Cal temp: 23.0C
Cal humidity: 23.0% RH
Cal procedure: 34460-90901 Truevolt DMM service manual, July 2016 edition 3
Cal inst: Fluke 5725A amplifier, ID 06-0090, NIST 12678290, Cal date 03 Aug 2017
Cal inst: Fluke 5700A/EP03 calibrator, ID 21-0140, NIST 11901768, Cal date 01 Dec 2016
Cal inst: Agilent/HP 33250A function generator, ID 407410002, NIST 12901089, Cal date 13 Oct 2017
Cal front panel zero offset, short, 10V range: as left 0.00000, min -0.00002V max 0.00002V, uncertainty 5.8uV
Cal front panel +10V, 10V range: as left 9.99999V, min 9.99966V max 10.00034V, uncertainty 35uV
Measurement details: front panel, 100PLC, HiZ
PX2 mean: 7.0456366V
PX2 lowest: 7.04563V
PX2 highest: 7.04564V
PX2 samples: 562
PX2 sd: 1uV
PX2 corrected: 7.045643V
ambient: 22.0C 33% RH (arduino, free air) 22.5 (k-type, above ref)
power: 11.94688V from supplied voltage regulator, fed with 15.0V from Tenma 72-8335A linear bench PSU
Equipment:
- Keysight 34465A dmm, instrument ID 869657
- Tenma 72-8335A linear bench PSU
- DM6801A temperature meter, K-type probe
- Cal club Arduino temp/humidity sensor
- Ian Johnston PDVS2 voltage source
Vreg was fed with 15.0V from Tenma 72-8335A linear bench PSU.
Output measured on Keysight 34465A, front jacks, 100PLC
Time series plot from cold shows that the regulator reached a stable voltage fairly rapidly.
Once warmed up (100PLC, HiZ, front jacks, T=21.7C, RH=32%:
mean 11.94688
lowest 11.94665
highest 11.94721
sd 115uV
ambient 21.7C
Next measured the reference, from room temperature, powered by the vreg, 100PLC, HiZ, front jacks.
I'm now considering using my Ian Johnston PDVS2 set to 7.0456V in opposition to the PX ref and measuring the difference. Note that the PX ref is more stable and less noisy than the LM399 in both the PDVS2 and the 34465A.
Once it was stable, measured the stability for 30 minutes.