34921t terminal block – Agilent Technologies L4400 User Manual
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L4400 User’s Guide
4
L4421A 40-Channel Armature Multiplexer
34921T Terminal Block
This terminal block with screw- type connections is labeled with the
model number and the abbreviated module name.
All modules that connect to the analog bus are interlock
protected. This means that when an installed module is exposed
(no terminal block or cable is connected), the analog bus relays
are open and disconnected from the analog buses. See
for further information.
The 34921T is the only terminal block that provides an isothermal
block with temperature reference for thermocouple measurements.
The temperature sensor is located on the bottom side of the PC board
as shown below. Also shown are two holes that you can use for
connecting an external temperature reference
Temperature
Sensor
34921T (viewed from bottom side)
External
Reference
to the terminal block.
N O T E
C A U T I O N
When wiring the terminal block via cables to the mainframe,
make sure the cables are connected to the correct connector. The
cables provide communication and power to the temperature
sensor on the 34921T terminal block. If cabling is not correct, an
error may occur indicating that the L4421A module is not fully
operational.