Connecting The EasySense unit will detect that the Current Sensor is connected.
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1 s Arbor Scientific General (PC-3165) Range: ± 1A Resolution: 0.5mA Resistance/Impedance: 0R18 (0.18 Ohms) High Precision (PC-3166) Range: ± 100mA Resolution: 50µA Resistance/Impedance: 1R8 (1.8 Ohms) High (PC-3167) Range: ± 10A Resolution: 10mA Resistance/Impedance: 0R018 (0.018 Ohms) Introduction The Smart Q s are used to measure the current flowing in a circuit. This range of s can be used in both DC and low voltage AC circuits. The Smart Q s are equipped with a micro controller that greatly improves the sensor accuracy, precision and consistency. They are supplied calibrated and the stored calibration (in Amps) is automatically loaded when the is connected. Connecting The EasySense unit will detect that the is connected. 1. Hold the housing with the Smart Q label showing on the top. 2. Push one end of the sensor cable (supplied with the EasySense unit) into the socket on the sensor housing with the locating arrow on the cable facing upwards. 3. Connect the other end of the cable to the input socket on the EasySense unit (with the locating arrow facing upwards).
2 Practical Information The should be placed in series with the circuit component through which the current is to be measured. s in either direction can be measured. The s have a very low resistance so that they introduce as little resistance as possible to the circuit. Red lead + Battery Black Lead - Lamp CAUTION: Never connect a directly across a battery or power supply, without a resistance component to limit the current to within the range of the sensor. Failure to limit the current will cause permanent damage to the sensor. SAFETY! Never use high voltages or household AC. Investigations Ohm s Law Series & Parallel circuits Alternative power investigations e.g. solar cells Battery Life Capacitor Discharge Heat & Electric Induction in a coil Electrical Component Characteristics Voltage/ relationships
3 What Changes the in a circuit? Use either Product No PC-3165 Range: ± 1A or Product No PC-3167 Range: ±10A. In this investigation the current flowing in a circuit is measured when a different number of electrical cells are connected. 10ohm resistor Assemble the apparatus as shown with the connected to the EasySense unit. Open the Graph application from the Sensing Science Laboratory program. Select the New Recording Wizard and the method as Snapshot mode. With no cells (batteries) connected, click on START. Click on the graph area to snap the first reading. In the Table display, type 'No cells into the first row of the Comments column. Connect one cell into the circuit and take another reading. Type a 'One cell' comment for this sample. Repeat with two, three and four cells. For this example the data has been displayed with the Axis Limits altered to 0 600mA.
4 Alternative energy Electric Fan (WIND) DC Motor with propeller blade attached Wind Power Using Product No PC-3166 Range: ±100mA. Assemble the apparatus as shown with the connected to the EasySense unit. The electric fan is used to replicate the wind. Open the Graph application; select Real time, with Timespan of 1 or 2 minutes. Locate the electric fan so it will turn the blades of the propeller that are attached to the DC motor. Switch the fan on. Click on START. Try altering the speed of the fan to see its effect on the current in the circuit. Solar Cells This example shows the data collected from two linked 3- volt Solar cells that were placed on a window ledge. The cells were connected into a simple circuit and the current and voltage output from them was recorded during a day.
5 Start up of a Bulb Switch Using the - Product No PC-3167 Range: ±10A or Product No PC-3165 Range: ± 1A and a Light e.g. Product No PC Lamp Battery Light Level 1. Assemble the apparatus as shown with the and the Light connected to two of the inputs on EasySense. 2. Close the switch so the lamp lights. Select either Test mode in the software or press Meter on the EasySense Advanced unit and adjust the distance of the light level sensor from the light bulb (to ensure readings are within range). Open the switch. 3. The data needs to be collected in FAST mode. FAST mode can be selected from the Graph application in Sensing Science Laboratory software or Fast Log from the unit. In this example, 1000 samples were taken, with an inter-sample time of 1 millisecond. The Trigger used was set for when the current sensor rises above 0.05A with a 25% pretrigger. The data has been displayed with the Axis limits for the current sensor altered to 0 3 Amps. 4. START logging. Close the switch quickly to complete the circuit. Note: Beware of the effect of contact bounce. Warranty All sensors are warranted to be free from defects in materials and workmanship for a period of 12 months from purchase the date of purchase provided they have been used in accordance with any instructions, under normal laboratory conditions. This warranty does not apply if the sensor has been damaged by accident or misuse.
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