Elenco 30MHz Dual Trace - Manual (Page 62)

59
APPLICATION
FREQUENCY RESPONSE MEASUREMENTS
(Refer to Fig.19)
A sweep generator and the X-Y mode of this oscilloscope may be used to measure
the audio or RF frequency response of an active or passive device up to 20 MHz,
such as an amplifier, band pass filter, coupling network, etc.
1. Connect the audio or RF output of the sweep generator to the input of the circuit
under test and the output of the test circuit to channel 2 (vertical axis) of the
oscilloscope. A demodulator probe will give a “text book” frequency response
display as shown in Fig.24, but a standard probe can be used which will result in
an envelope display.
2. Connect the sweep ramp voltage of the sweep generator to the channel 1 input of
the oscilloscope.
3. Set the X-Y switch to the X-Y position (engaged) and adjust the channel 1 and 2
controls for a suitable viewing size.
Fig.19 Frequency Response Measurement
4.08 MHz
3.58 MHz
3.08 MHz
90%±10%
VALLEY
15% MAX
TILT 10% MAX
4.50MHz
85%
+15%, -20%