Measurement Computing DBK Part 2 - Manual (Page 82)

DBK48, pg. 2 967792 8B Isolated Signal Conditioning Module
Safety Concerns
WARNING
Shock Hazard! Voltages above 50 Vrms AC and voltages above 100 VDC are
considered hazardous. Safety precautions are required when 8B modules are used in
situations that require high-voltage isolation from the rest of the system. Failure to
practice electrical safety precautions could lead to injury or death.
DBK48 has a 250 VDC isolation specification. This is in a normal environment free of conductive
pollutants and condensation. The 250 VDC rating requires a proper earth ground connection to the chassis
and treatment of adjacent inputs as potentially hazardous.
Input cables must be rated for the isolation potential in use. Line voltage ratings are much lower than the
DC isolation values specified due to transients that occur on power lines. Never remove the cover unless all
inputs with potentially hazardous voltages are removed. The cover must be securely screwed on during
use.
Some things to remember:
• Properly tighten all chassis screws before system use.
• Never plug in or unplug potentially hazardous connections with power applied to any
connected equipment.
• Never attempt to change 8B modules or remove the cover plate while power is applied to
the DBK48. You could short out internally exposed circuits and cause personal injury or
equipment damage.
• Disconnect power, all equipment, and signal lines from the DBK48 prior to installing
8B modules.
Reference Note:
Refer to user manual that is associated with your primary Daq device.