ACCEPTANCE TESTING
6-A-5
C0219
LF
OUTPUT
UUT
Audio Analyzer
INPUT
➤
Fig. 6-A-4 LF output levels test set-up for 0.0005 V
Frequency response
(1) Connect the test equipment as shown in Fig. 6-A-2.
(2) Set the UUT to give an LF output of 1 V at 1 kHz on the first modulation oscillator (refer to
'Level accuracy' above).
(3) Reference this level on the audio analyzer using the dB relative function.
(4) Set the modulation oscillator to the frequencies given in Table 6-A-4 measuring the difference
from the reference in (3) above which should be less than 1 dB.
(5) Set the UUT to give an LF output of 1 V at 1 kHz on the second modulation oscillator (refer
to 'Level accuracy' above).
(6) Repeat (3) and (4) above.
Table 6-A-4 Test frequencies
Test frequencies
10 Hz
1 kHz ref
70 kHz
30 Hz
10 kHz
100 kHz
100 Hz
30 kHz
300 kHz