Signal Connections Chapter 3
SCXI-1124 User Manual 3-2 © National Instruments Corporation
60 ºC for measuring 250 V. Prepare your signal wire by stripping the
insulation no more than 7 mm.
When connecting or disconnecting signal lines to the SCXI terminal block
screw terminals, make sure the lines are powered off. Potential differences
between the lines and the SCXI ground create a shock hazard while you
connect the lines.
When using this module with a terminal block, connect the signal wires to
the screw terminals by inserting the stripped end of the wire fully into the
terminals. Tighten the terminals to a torque of 5–7 in.-lb.
If high voltages (
≥
30 V
rms
and 42.4 V
peak
or 60 VDC) are present,
YOU
MUST CONNECT A SAFETY EARTH GROUND WIRE TO THE TERMINAL BLOCK
SAFETY GROUND SOLDER
LUG
. This complies with safety agency
requirements and protects against electric shock when the terminal block is
not connected to the chassis. To connect the safety earth when the terminal
block is not connected to the chassis. To connect the safety earth ground to
the safety ground solder lug, run an earth ground wire in the cable from the
signal source to the terminal block. National Instruments is
NOT
liable for
any damages or injuries resulting from inadequate safety earth ground
connections.
Do no loosen or re-orient the safety ground solder lug hardware on the
terminal block when connecting the safety ground wire. To do so reduces
the safety isolation between the high voltage and safety ground.
Clean devices and terminal blocks by brushing off light dust with a soft,
nonmetallic brush. Remove other contaminants with deionized water and a
stiff nonmetallic brush. The unit must be completely dry and free from
contaminants before returning to service.
Use only National Instruments hih-voltage TBX Series cable assemblies
with high-voltage TBX Series terminal blocks.
To comply with UL and CE requirements, use this module only with a
UL listed SCXI chassis.
