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Page
108
October 2014
4.2
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.
►
Step2
:
Connect the Probe through Channel 1 to the signal source the input signal in the
circuit. And Probe 2 through Channel 2 to its signal source the output signal in
the circuit.
►
Step3
:
Press AUTOSET button to let oscilloscope run through a pre-set function and
apply them to both signals coming into Channel1 and Channel 2.
►
Step4
:
Press
MEASURE
to activate measurement function menu.
Press
F1
next to Source to highlight Source.
Press
F2
to set Source as
CH1
.
Press
F3
to set Source as
CH2
.
Press
F1
to highlight
Type
.
Press
F2
to set
Pk
-
Pk
.
Press
F3
to set
Pk
-
Pk
.
Get
Pk
-
Pk
readings of Channel 1 and Channel 2. (see Fig. 104).
Calculate the amplifier gain with the following formulas.
Gain = Output Signal / Input signal
Gain (db) = 20×log (gain)