Continuous
250 V RMS, Measurement Category II
Withstand
2,300 V RMS, verified by a 5 s dielectric withstand test
NI-9421 with DSUB Safety Voltages
Connect only voltages that are within the following limits:
Channel-to-COM
30 V maximum
Overvoltage protection
40 V maximum
Reverse-biased voltage
-30 V maximum
Isolation
Channel-to-channel
None
Channel-to-earth ground
Continuous
60 V DC, Measurement Category I
Withstand
1,000 V RMS, verified by a 5 s dielectric withstand test
Safety Guidelines for Hazardous Locations
The NI-9421 is suitable for use in hazardous locations; , and hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
NI-9421 in a potentially explosive environment. Not following these guidelines may
result in serious injury or death.
Caution
Do not disconnect I/O-side wires or connectors unless power has
been switched off or the area is known to be nonhazardous.
Caution
Do not remove modules unless power has been switched off or
the area is known to be nonhazardous.
© National Instruments
5
NI-9421 Getting Started