Product specifications

14 Instrumentation Laboratory Exercise
Laboratory Exercise #1 Test Report NAME:______________________________
Part 1:
Calculate the equivalent resistance of the two resistors in parallel: R = __________
Calculate the anticipated voltage across the resistors in parallel: V = __________
Measure the voltage between the ground and the two lower resistors: V = __________
Part 2:
Now set up the apparatus to measure the voltage drop across the upper resistor as well. Keep the previous measurement on
line, and add a measurement of the overall voltage (for example, ~5 V). The difference between these voltages is the drop
across the upper resistor.
Measure the voltage across the upper resistor: V = __________
i Display the voltage across the resistors in parallel, and the whole voltage divider (for example, approximately 5 V).
ii Make a program which can calculate the voltage drop across the upper resistor, and display that voltage as well.
iii Now calculate the current through the circuit using I = V/R, assuming the upper resistor is exactly 1 kΩ.
iv Measure and display the current. Also measure the current draw reported by the power supply.
I (power supply) = __________ I (calculated) = __________
Call the technician and have him verify your setup:
Technician Check
Questions
Was the voltage that you calculated in Part 1 the same as what you measured?
Why could it be different?