Keysight U1281A/U1282A Service Guide 7
Environmental Conditions
The U1281A/U1282A is designed for indoor use and in an area with low 
condensation. The table below shows the general environmental requirements for 
this instrument.
Environmental condition Requirement
Temperature
Operating condition
– –20 °C to 55 °C, 0% to 80% RH (non-condensing)
Storage condition
– –40 °C to 70 °C, 0% to 80% RH (without batteries)
Humidity
Full accuracy up to 80% RH (relative humidity) for temperature up 
to 30 °C, decreasing linearly to 50% RH at 55 °C
Altitude Up to 3000 meters
Pollution degree 2