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August 2012
13
Revision F
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 1140LA into the test set-up of Figure 4-1.
h)
Place the 1140LA 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
50 dB Attenuator
Sweep Generator
RF Output
10 KHz
– 2 MHz
Spectrum
Analyzer
Power Meter
30 dB
coupler
