9
Connection of the Attotech amplifier (option)
Warning
Make sure that your wall power socket delivers the voltage that has been pre-set for the driver
unit and that is indicated on the back of the rack (see picture below, #11).
Description of the driver unit
The front panel of the drive unit is divided vertically in two parts corresponding to inputs,
adjustment knob and monitoring devices grouped in the left part, and the high voltage unit located
on the right part.
1.
Main power switch
2.
Peak
voltage
indicator
3.
Control voltage select
4.
Voltage adjustment knob
5.
Low voltage to high voltage connect
6.
Low voltage monitor connector, high Z
7.
Control input connector, high Z
8.
Gate input connector, high Z
9.
High voltage offset (disabled)
10.
Control input (disabled)
11.
High voltage output
Electrical connections
A delay box with microsecond resolution triggered by the laser directly or a photo diode should be
used to feed the piezo drive unit through its gate input connector (#8). It should be a
positive
TTL. Recommended values for the opening gate are 120-500
μ
s.
The high voltage output (#11) is connected to the Lemo connector on the piezo valve. If you use
vacuum feedthroughs and extensions, make sure that the cables and connectors are specified for
500 V rms. The control input (#7) can be used to control the output voltage of the device with an
external DC voltage source, for instance a PC with a DAC card.