The AHVA250V2X40MA is an electronic module for
amplifying an analog input voltage into a high voltage output. Figure 1 shows its
physical photo. It comes with a high voltage DC-DC converter, which converts
the 24V input voltage into a 0 to 250V output voltage. The analog output
voltage can swing almost from 0 to 250V when it is powered by a 24V power
supply. There is three LEDs indicating if the amplifier works properly.