Model
A5
-12 Operation & Service Manual
A5-12 Manual A5 21 January 2005
Page 9
4 Performance
Verification
4.1 Equipment
Required
a)
Spectrum analyser and tracking generator, 1 MHz to 100
MHz.
b)
Sine wave signal generator or function generator, 10 MHz
c)
RF Power meter
d)
Low pass filter, Mini-circuits BLP 10.7
e)
50
Ω
BNC load
In addition, if input and output load and source impedance’s are to be checked, a
network analyser will be required.
Verification of the phase noise levels can be extremely difficult, requiring a cross
correlation type of phase noise test set, with a noise floor below -150dBc at 1Hz
and -160dBc at 10 Hz offset.
4.2 Procedures
4.2.1
Frequency Response
Connect the tracking source to the input of the Model A5-12, and the spectrum
analyser to any output. Set the tracking generator output level to 10 dBm, and the
spectrum analyser to sweep between 1 MHz and 100 MHz. Adjust the A5-12 gain
control (VR1) to give an output level of 13 dBm at 10 MHz.
Measure the frequency response and verify against the specifications.
4.2.2
Harmonic Distortion
Connect the 10 MHz signal source to the Model A5-12 input using the low pass
filter to remove source harmonics to less than -60 dBc. Set the output level to +10
dBm. Connect the spectrum analyser to any output and adjust the A5-12 gain
control to give +13 dBm output. Use the spectrum analyser to measure the
harmonic distortion, and verify against the specifications. Repeat for other outputs
if desired. Take care that the spectrum analyser is not generating harmonics so as
to affect the measurement.
4.2.3
Output to Output Isolation
Set the tracking generator to +10dBm output level, and connect to any output of
the A5-12. Terminate the A5-12 input with a 5
0Ω
load. Connect the spectrum
analyser to any other output of the A5-12, and adjust for maximum sensitivity.