Caution Do not connect the NI 9421 with screw
terminal or NI 9421 with spring terminal to signals or
use for measurements within Measurement
Categories III or IV.
NI 9421 with DSUB Safety Voltages
Connect only voltages that are within the following limits:
...........................................................Channel-to-COM 30 V max
Isolation
...................................................Channel-to-channel None
Channel-to-earth ground
...........................................Continuous 60 VDC,
Measurement Category I
...........................................Withstand 1,000 Vrms, verified by a
5 s dielectric withstand test
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
NI 9421 Getting Started Guide | © National Instruments | 5
To Next Page
Loading...
Need help?
General
