User`s guide

3-2
Figure 3-2
Block Diagram of the 1001-0302 Power Supply Board
Here is a brief description of these components:
• Fuses F1, F2, F3: Serves to protect both the user and the electronics in case of
a surge or overload condition. The fuses are also used to select the input
voltage range. See Table 2-1.
• Terminal Block: Entry point for the AC mains power. Three conductors are
necessary for the connection: AC line, AC line, and Earth Ground.
• Transformer: Converts the AC mains power to a lower voltage level that can
then be utilized by the regulator electronics. In addition, the transformer provides
isolation between the primary (high voltage) and the secondary (low voltage) for
user safety.
• Bridge Rectifier: Provides full-wave rectification of the AC power signal from the
transformer, which results in a pulsating DC waveform.
• Capacitors: Serves to ‘smooth-out’ the ripples from the pulsating DC power
signal coming from the bridge rectifier.
• Voltage Regulator: Converts the filtered DC power signal to a highly regulated
output voltage that varies relatively little regardless of the applied load.
• LED: Provides a simple indicator to the user that the power supply is operating.
Caution is advised however since failure of this light to illuminate does not
necessarily mean that the AC mains power is absent. It should always be
assumed that the AC mains power is present at the terminal block until