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December 2015
10
Revision F
2. Connect the equipment as shown in Figure 4-1, then proceed as follows:
a)
Set the oscilloscope to DC, Time/cm to Ext. X, and gain to
l0mv/cm.
b)
Set the sweep generator to the video sweep mode with the start
frequency at 250 kHz and the sweep width to 150 MHz.
c)
Disconnect the 350L from the set-up and connect the
sweep/generator RF output directly to the 30 dB attenuator.
d)
Adjust the output level of the sweep/generator for full vertical
deflection on the oscilloscope face.
e)
Calibrate the scope face to show 3 dB in 1 dB steps by
attenuating the sweep/generator in 1 dB.
f)
Return sweep/generator output level to full deflection. Rotate the
step attenuator (CCW) so that the output is reduced by 50 dB.
g)
Reconnect the 350L into the test set-up of Figure 4-1.
h)
Place the 350L power switch to the "ON" position.
i)
Observe the gain versus frequency sweep on the oscilloscope.
The average gain should be greater 50 dB
The gain variation should be within the 3 dB as shown on the
oscilloscope.
4.4.2 Measurement of Harmonics
Figure 4-2.
1.) Equipment Required:
a)
Sweep/Signal Generator
30 dB Attenuator
Sweep Generator
RF Output
250 KHz
– 150 MHz
Spectrum
Analyzer
Power
Meter
30 dB
coupler
