Keithley DMM6500 Quick Start Manual page 4

Power and envrionmental specifications
For indoor use only.
Power supply 50 Hz to 60 Hz and 400 Hz, the line
frequency voltage is automatically sensed at
power-up
Maximum VA 50 VA
Operating Maximum 2000 m (6562 ft) above sea level
altitude
Operating 0 °C to 50 °C, 80% relative humidity at 35 °C
temperature
Storage -40 °C to 70 °C
temperature
Pollution 2
degree