3.4.8.1 Mains Voltage Sense Input

Mains voltage is connected to the PL360MB board by two resistors, R118 and R130. Line voltage has a single-ended input referred to the neutral voltage (GND pin). This voltage is distributed to an ADC input through an 11-resistor (1%) divider with a ratio of 0.6057V : 1000V. An additional RC filter (R85/C113) limits the input bandwidth to approximately 16 kHz as shown in the following figure.

Figure 3-21. Mains Voltage Sense Input Schematic

Important: By default, R118 and R130 resistors are not populated, so mains voltage sense input is disabled.

Warning: Note that if performing metrology voltage, the board loses galvanic isolation, so convenient caution must be taken into account.