12 Keysight 34950A User’s Guide
Operating Considerations
See the Introduction to the Plug In Modules chapter of the 34980A Mainframe 
User’s Guide for detailed environmental operating conditions for the 34980A 
mainframe and its installed modules. That guidance sets maximum per channel 
current and power ratings at rated voltage for pollution degree 1 (dry) and 
pollution degree 2 (possible condensation) conditions, for the Digital I/O module.