Products > Test Equipment
Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)
joeqsmith:
Looking at the 1VDC signal from my standard over night (8-9 hours). You can tell when I enter the room.
I'll use my 33120A with no warmup to collect VAC next. 200mVPP 100KHz sine wave into a 50ohm terminator. Not a great setup but should give us some idea how it will behave once things warm up.
SilverSolder:
Is that using the 10V range, or 1V?
joeqsmith:
--- Quote from: SilverSolder on January 26, 2021, 02:30:17 pm ---Is that using the 10V range, or 1V?
--- End quote ---
We can also see from the data I collected, the step size is 1uV. From the manual, we can see it has a resolution of 1uV in the 1V range. So five counts of noise. Eyeballing it, maybe one count of drift over that time. Seems fairly stable and low noise for an almost a 40 year old meter.
I don't have any way to know absolute accuracy. I used my old HP34401A as a reference so these two meters are fairly close. My other old HP bench meter will throw up different numbers. The voltage standard will have an error as well. So don't read too much into the absolute numbers based on my home alignment.
guenthert:
--- Quote from: joeqsmith on January 26, 2021, 03:43:43 pm ---
--- Quote from: SilverSolder on January 26, 2021, 02:30:17 pm ---Is that using the 10V range, or 1V?
--- End quote ---
We can also see from the data I collected, the step size is 1uV. From the manual, we can see it has a resolution of 1uV in the 1V range. [..]
--- End quote ---
Doesn't the 8505/6 famously have a 7.5 digit 10V range? That would make 1uV resolution ambiguous.
SilverSolder:
You can get 1uV on both the 10V and 1V ranges.
It may perform slightly better on the 10V range? Worth a comparison. (Need to enable averaging to get to 7.5 digits on 10V)
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