VTI Instruments Corp.
286 EX10SC Signal Conditioning
CHANGING SIGNAL CONDITIONING MODULES
The EX10SC is designed to allow the customer to change the 8B modules if test requirements
change or when a module becomes non-functional. Before removing an 8B module, ensure that the
mainframe has been powered down and that the power cable has been removed from the unit. Proper
ESD precautions should be taken when changing a signal conditioning unit and removal should only
be performed by a qualified technician.
The following process can be used to remove an 8B module:
1) Remove all power from the EX10SC mainframe.
2) Using a #2 Phillips screwdriver, loosen the quarter-turn captive screws located at the top of the
EX10SC near the front of the chassis. These screws will remain attached to the lid once they
are loosened.
3) Next, find the 8B module that will be removed and, using the #2 Phillips screw driver, loosen
the screw until it is no longer secured in the PCB.
4) Remove the 8B module from the captive jacks on the PCB.
5) Next, insert the replacement 8B module onto the PCB, securing the module with the captive
Phillips screw on the module.
6) Close the lid of the EX10SC and tighten the quarter-turn captive screws.
This feature allows the user flexibility when using the EX10SC, as a variety of 8B modules can be
installed in the same mainframe and can also be mixed-and-matched after the unit has been fielded.
In addition to changing the 8B module, jumper and shunt resistor requirements must also be
considered. The location of the 8B module, the jumpers, and the shunt resistor sockets are shown in
Figure 9-6.
Jumper Settings
For most 8B modules, jumpers must be installed to connect the module to an on-board thermistor.
The thermistor is used for cold junction compensation on thermocouple modules, while is used for
temperature compensation on others. Table 9-3 shows which modules require connection of the JPx
jumper on the EX10SC PCB.
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