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February 2007
11
Revision B
attenuating the sweep/generator in 1 dB steps.
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 3100L into the test set-up of Figure 4-1.
h)
Place the 3100L 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 150 kHz, for an
indicated output of 100 watts on the power meter.
b)
Using the spectrum analyzer, check that the level of the carrier
harmonics is less than -25 dB with respect to the carrier while manually
scanning the frequency band of 150 KHz to 150 MHz. An indicated
power output of 100W should be maintained during this operation.
30 dB
coupler
30 dB Attenuator
Sweep Generator
RF Output
150 KHz – 120 MHz
Spectrum Analyzer
Power Meter
30 dB Attenuator
Sweep Generator
RF Output
150 KHz – 120 MHz
Sweep Generator
RF Output
150 KHz – 120 MHz
Spectrum Analyzer
Power Meter