BoscoThat would be a good candidate for a display replacement. A Fluke 5442A Direct Volts Calibrator.
#fluke #voltnuts #hp3458a
Søren KjærsgaardIn January, I bought two 10V references, based on LM399. I was a bit skeptical on the design, following Marco Reps on YouTube does that to you 😂, but a teardown revealed quality components (Vishay precision resistors) and a decent circuitry and PCB layout.
I measured the standard deviation on the 10V output, using my 3458A, and I’ve done so monthly-ish ever since, leaving them powered all the time.
In March I added two more, unit 3 and 4.
Result so far: unit 1,2,3 are converging towards 1uV SDEV, unit 4 however (separate curve), started out sky-high, but it has now joined the ppm club 🤷🏼♂️😳
Someone mind telling me what’s going on? I mean, it’s wellknown that the noise drops over time, but why? What physical/chemical factors comes at play, causing this behavior?
#voltnuts #ppmgeek #electronicsengineering #testandmeasurement
I measured the standard deviation on the 10V output, using my 3458A, and I’ve done so monthly-ish ever since, leaving them powered all the time.
In March I added two more, unit 3 and 4.
Result so far: unit 1,2,3 are converging towards 1uV SDEV, unit 4 however (separate curve), started out sky-high, but it has now joined the ppm club 🤷🏼♂️😳
Someone mind telling me what’s going on? I mean, it’s wellknown that the noise drops over time, but why? What physical/chemical factors comes at play, causing this behavior?
#voltnuts #ppmgeek #electronicsengineering #testandmeasurement
It’s Friday, let’s play a game 🙂
Post something that's a flex to a niche group, that most folks won't understand.
I'll start.
#voltnuts
Evening relaxation with the HP Agilent Keysight DMM family starting with the HP 3458A and various voltage references. A few comparisons with the different multimeters. #voltnuts