ACCEPTANCE TESTING
5-1-A-3
(3)
Referring to Table 5-1-A-1, check that the oscillator frequencies can be selected
correctly and are within specification.
(4)
To monitor the second modulation oscillator, enter the following:
[FM2] [Select Source] [Select Internal] [Internal F1]
[LF] [Mod2 Source] [SIG GEN] [Source Freq:]
The frequencies of the second modulation may now be entered.
(5)
Repeat (3) above.
TABLE 5-1-A-1 MODULATION OSCILLATOR FREQUENCIES
Modulation oscillator frequencies
(Hz)
10.00
279,620.20
139,810.10
500,000.00
Modulation oscillator distortion
C0219
LF
OUTPUT
UUT
Audio Analyzer
INPUT
➤
Fig. 5-1-A-2 Modulation oscillator distortion test set-up
(1)
Connect the test equipment as shown in Fig. 5-1-A-2.
(2)
Set the UUT such that the first modulation oscillator may be tested (refer to
'Modulation oscillator frequencies' step (2) above).
(3)
Check that the distortion measured on the audio analyzer at the frequencies
indicated in Table 5-1-A-2 is less than 0.1%.
(4)
Set the UUT such that the second modulation oscillator may be tested (refer to
'Modulation oscillator frequencies' step (4) above).
(5)
Repeat (3) above.
TABLE 5-1-A-2 DISTORTION FREQUENCIES
Modulation oscillator frequencies
100 Hz
10 kHz
1 kHz
20 kHz
