18-12-2012, 04:35 PM
CURRENT SENSOR
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Introduction
The PASCO CI-6556 Current Sensor is designed to be
used with a PASCO computer interface to measure
currents of ±1.5 amperes.
The Current Sensor can be plugged directly into any
analog channel (A,B, or C) on the PASCO 700i Science
Workshopä interface or analog channel A on the 300i or
500i Science Workshop interface. This is because the
Current Sensor should only be connected to a non-ground
referenced, differential input.
Current passing through the two input connectors
develops a voltage across the 1.00 W, 2 W resistor in the
Current Sensor. The voltage developed at the resistor is
related to the current according to Ohm's Law:
V = I x R
(where V = voltage in volts, I = current in amps, and R =
resistance in ohms).
Since the Current Sensor utilizes a 1.00 W resistor, the
voltage seen across the resistor is equal to the current
flowing through the resistor. The computer interface
channels this voltage into Science Workshop, which
reports the value in amperes (A) of current.
Mounting on an Experimental Apparatus
Use the 1/4–20 threaded screw connector located on
the bottom of the sensor box to secure the Current Sensor
to an experimental apparatus (Figure 6). The alignment
hole fits over an alignment pin included on some PASCO
apparatuses.