Instrument Description 4-9
High-Voltage Power Supply
The high-voltage power supply provides a charge on the center rod of the
DMA. For single-polarity units, a single (negative) high-voltage module is
installed. For dual-polarity units, two high-voltage modules are installed
(one positive and one negative). Dual polarity units also include a high-
voltage relay PCB which facilitates switching between the two polarities.
DMA Lower Bracket
The DMA lower bracket is the spring-loaded mechanism used to attach a
DMA to the Classifier. Contacts in the bottom of the DMA lower bracket
make contact with the memory chip on the base of an upgraded DMA to
read the model number and DMA parameters. The DMA bracket is
backwards compatible such that a non-upgraded DMA can still be installed
onto the classifier, but will not have auto-detection capability. If your DMA
does not have this capability, you can purchase an upgrade kit 3081U or
3085U from TSI to take advantage of this feature and other improvements.
Communication Ports
The following communication ports are available on the instrument
back panel (Figure 4-6):
Connects to PC, switch, or LAN.
Using this connection, the classifier can either control or
be controlled by an external, third-party device (such as
an auto sampler).
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