2-12 Agilent E5250A User’s Guide, Edition 9
Installation
Installing the E5250A
For example, if a mainframe installs four E5255As which the IVin1 cable is
connected to the SMU1 input connector and the IVin2 and IVin3 cables are not
connected, the E5250A configures a 32-output multiplexer that uses the SMU
INPUT 1 connector as the IV input.
To Mount Protective Resistors
To protect the device (DUT) from electrical damage, you can mount resistors
between the IV input and BIAS input of multiplexer. The following procedure
shows how to mount the resistors. See Figure 2-2 for the component locations.
When shipped from the factory, 0 Ω resistors are mounted, and bit 4 of all DIP
switches is set to OFF (0).
1. Cut the original resistors (0 Ω) off.
2. Loosen the screws from both sides of the resistor holder.
3. Put res i st ors in holder, and tighten screws. And confirm that the resistors are
held properly. Resistors should be mounted on each multiplexer block that you
will use (8 resistors/block).
4. Set bit 4 to ON (1) for the DIP switch of the related block. For example, if you
mount resistors for Block 1 and 2 multiplexers, set bit 4 to ON fo r DIP S W1 and
SW2.
To Select Protective Resistors
Be careful about the following when selecting protective resistors. Also, be careful
about the heating of the rear panel of mainframe or plug-in module, which may be
heated by resistors, even if you follow this warning.
• If only one E5255A is installed in the mainframe:
Total power consumption by resistors must be less than 16W.
• If multiple E5255As are installed in the mainframe:
Total power consumption by resistors must be less than 32W.
• Consider the current flows to resistor when DUT shorts, and make sure the
power consumption by resistor will be within specification of resistor. Do not
use resistors that have specifications inadequate for your applications, which
will result in resistors heating up, burning, or smoking.