ACCEPTANCE TESTING
6-21
(11) Calculate the FM deviation using the following formula:
2
F2
-
F1
= Measured dev = FM1
(12) It will now be necessary to reconnect the test equipment as shown in Fig. 6-10, reset the
function generator to 1 kHz and measure the FM deviation on the modulation meter (FM2).
(13) Using the following formula, calculate the change in response which should be less than 1 dB:
20 log
10
FM2
FM1
(14) Transfer the function generator output to EXT MOD 2 INPUT on the UUT, select [FM2] and
repeat (3) to (13) above.
Table 6-15 External FM response frequencies
Modulating frequency (Hz)
0
100
1,000
50,000
200,000
30 300
10,000
100,000 300,000