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Ocotber 2008
12
Revision D
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 A300 into the test set-up of Figure 4-1.
h)
Place the A300 power switch to the "ON" position.
i)
Observe the gain versus frequency sweep on the oscilloscope.
•
The average gain should be greater 55 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
b)
Calorimetric Power Meter HP435B
30 dB Attenuator
Sweep Generator
RF Output
10 KHz – 35 MHz
Spectrum
Power Meter
30 dB
coupler