©
National Instruments Corp.
13
NI 9861 Operating Instructions
Physical Characteristics
Caution
If you need to clean your NI 9861, wipe it with
a dry towel. The product must be completely dry and free
from contaminants before you return it to service.
Weight............................................... Approx. 144 g (5.0 oz)
Safety
Maximum Voltage
1
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
1
The maximum voltage that can be applied or output between any port or V
SUP
terminal and a COM terminal without creating a safety hazard.