Wavetek 3000 Instruction Manual page 52

PERFORMANCE TESTS
METHOD
4- 12
4 .7 NON-HARMONICS TEST
4 . Increase the setting
of the Signal Generator FREQUENCY
selector in 1 MHz steps between 1 and 10 MHz while observing
the spectrum analyzer display .
The harmonics should be >26
dB below the fundamental . Record the maximum harmonic ob-
served in the
display in dB below the fundamental on line
17 of the PTR .
5 .
Set the Signal Generator OUTPUT step attenuator to 0 dBm,
and repeat steps 3 and 4 at the +3 dBm output level . Record
the maximum harmonic
observed in dB below the fundamental
on line 18 of the PTR .
6 . Set the Signal Generator
FREQUENCY selector to 10 MHz
and the OUTPUT step attenuator to +10 dBm .
7 .
Set the spectrum analyzer to measure
harmonic dis-
tortion of the Signal Generator for fundamental frequencies
between 10 and 520 MHz . Set the bandwidth to 300 kHz
and
the frequency span per division to 100 MHz .
8 .
Increase the setting of the Signal Generator FREQUENCY
selector in 10 MHz steps between 10 and 520 MHz while observ-
ing the spectrum analyzer display .
The harmonics should be
>30 dB below the fundamental .
Record the maximum harmonic
observed in the display in dB below the fundamental on line
19 of the PTR .
9 . Set the
Signal Generator OUTPUT step attenuator to 0
dBm and repeat steps 7 and 8 at
the +3 dBm output level .
Record the maximum harmonic observed in dB below the funda-
mental on line 20 of the PTR.
SPECIFICATION
Non-harmonics are shown in the following table :
A spectrum analyzer is used to
measure the level of non-
harmonics in the 1 to 520 MHz range at +13 dBm,/the maximum
specified output level of the Signal Generator .
Fundamental Range
(MHz)
Non-harmonic Range
PiHz
-
Non-harmonic level
dB below fundamental
1 to 3
1 to 3 >60
3 to 250 3 to 250
>65
3 to 350 3 to 350
>55
3 to 520 3 to 1000
>35
frequency span per division to 5 MHz, and the display to 10
dB/div .
Locate the zero reference at the left edge of the
graticule,
and adjust the fundamental amplitude to the log
reference line (0 dB) in the display .