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August 2012
12
Revision E
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 A150 into the test set-up of Figure 4-1.
h)
Place the A150 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
b)
Calorimetric Power Meter HP435B
c)
Spectrum Analyzer.
d)
Attenuator (30dB)
e)
Coupler (30 dB)
2.)
Connect the Equipment as shown in Figure 4-2, then proceed as follows:
a)
Adjust the signal generator to a CW center frequency of 300 kHz, for an
indicated output of 125 watts on the power meter.
b)
Using the spectrum analyzer, check that the level of the carrier
30 dB
coupler