NI 9852 Operating Instructions 18 ni.com
Safety
Maximum Voltage1
Connect only voltages that are within these limits.
Port-to-COM.....................................–27 to +40 VDC max,
Measurement Category I
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. This category is for
measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.
Caution Do not connect to signals or use for
measurements within Measurement Categories II, III,
orIV.
1 The maximum voltage that can be applied or output between any port or VSUP
terminal and a COM terminal without creating a safety hazard.