20 Keysight 34921A-34925A Low Frequency Multiplexer Modules User’s Guide
Low Frequency Multiplexer Modules 34921A 40-Channel Armature Multiplexer with Low Thermal Offset
34921T Terminal Block
This terminal block with screw-type connections is labeled with the model
number and the abbreviated module name. In addition, space is available on the
label for you to write the slot number.
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 to the terminal block.
All modules that connect to the internal DMM 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 “Safety Interlock” on page 11 for further information.
Temperatur
e
34921T (viewed from bottom side)
External
Reference
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 34921A module is not fully operational.
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