Tech Note 1156 Detail

Voltage-Current Sensor Theory of Operation

Affected Products:

PS-2115 PASPORT Voltage-Current Sensor

Problem/Symptom:
Voltage-Current Sensor Theory of Operation

PASCO Solution:

Theory of Operation

The voltage sensor measures the voltage drop across a precision voltage divider, which is proportional to, but smaller than the voltage at the inputs. The current sensor measures the voltage drop across a precision 0.5 Ohm resistor, which is proportional to the voltage according to voltage = resistance * current. Current and voltage measurements alternate rapidly and multiple measurements are averaged in order to obtain an accurate measurement of real power.

The voltages are then digitized via a 12-bit Analog-to-Digital converter to obtain a PASPort-compatible signal.

Creation Date: 09/26/2011
Last Modified:
Mod Summary: