[volt-nuts] HP-3458A Zero Reading

[Mike S]

On 7/27/2015 10:26 PM, Mike S wrote:
> On 7/27/2015 7:54 PM, Bill Gold wrote:
>> You will observe that the HP/Agilent/Keysight manual for the 3458A
>> does not give any "zero" stability specs, at least that I can find.
> 
> On DC 100 mV range, the standard model is spec'd for 14+3 ppm of range @
> 2 years from calibration, not considering temperature. That's 1.7 uV,
> from my reckoning. The OP's reading of 0.7 uV is well within that - it
> even beats the 90 day spec.

Doh. That 14+3 actually equates to ~=3 ppm ~= 0.3 uV (since reading is
essentially zero), but there's also temperature, which contributes >
0.115 / C.