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94
Example 2: Working out the Gain of the Amplifier in the
Metering Circuit
The purpose of this example is to work out the Gain of an Amplifier in a Metering
Circuit. First we use Oscilloscope to measure the amplitude of input signal and output
signal from the circuit, then to work out the Gain by using given formulas.
Step1
Go to both CH1 menu and CH2 menu and then their Probe menu to set attenuation
coefficient as 10X, turn the switch on the Probe to 10X as well.
Step 2
Connect the Probe through Channel 1 to the signal source the input signal in the
circuit. Connect the Probe 2 through Channel 2 to its signal source the output signal in
the circuit.
Step 3
Press AUTOSET button to let oscilloscope run through a pre-set function and apply
them to both signals coming into Channel1 and Channel 2.
Step 4
1. Press MEASURE to activate measurement function menu.
2. Press F1 next to Source to highlight Source.
3. Press F2 to set Source as CH1.
4. Press F3 to set Source as CH2.
5. Press F1 to highlight Type.
6. Press F2 to set Pk-Pk.
7. Press F3 to set Pk-Pk.
8. Get Pk-Pk readings of Channel 1 and Channel 2. (See Fig. 6-2).
9. Calculate the amplifier gain with the following formulas.
Gain = Output Signal / Input signal
Gain (db) = 20×log (gain)
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