Lab Practical Practice (Phys2303)

1) Op Amp Question
A) Construct a gain of 10 inverting amplifier.

B) Drive the amplifier using the function generator so that the output of the amplifier is a 2 kHz 3Vpp sine wave.

C) Measure the actual gain of the amplifier at 2 kHz; and at DC.

How many measurements do you need to make? Outline how you would make the measurement?

What are the other types of Op Amp circuits we learned about? Draw their schematics.

2) High-Pass Filter
A) Construct a 2 kHz RC high-pass filter.

B) Measure the frequency of the 3 dB point using the function generator and the oscilloscope. How many measurements do you need to make? Outline how you would make the measurement?

At the 3 dB point, Vout/Vin = ?

Think of the RC filter as a frequency dependent voltage divider, at DC Vout/Vin = ?; at infinite frequency Vout/Vin = ?

3) Low-Pass Filter
A) Construct a 500 kHz RC high-pass filter.

B) Measure the frequency of the 3 dB point using the function generator and the oscilloscope. How many measurements do you need to make? Outline how you would make the measurement?

At the 3 dB point, Vout/Vin = ?

Think of the RC filter as a frequency dependent voltage divider, at DC Vout/Vin = ?; at
infinite frequency Vout/Vin = ?

4) DMM Measurements. Measure the voltage and short circuit current of the battery with the DMM. Knowing that the internal resistance of the DMM is 10M in voltage mode and negligible in ammeter mode, calculate the open circuit voltage of the battery. (Hint: You need to make two measurements, a voltage measurement and a current measurement.)

Define open circuit voltage. Is this what you measure using the DMM?

Define short circuit current. Is this what you measure using the DMM?

Draw a schematic for the voltage measurement.
Draw a schematic for the current measurement.

Can you also measure the internal resistance of the battery too?