TB 9-6625-2155-24
(e) Source level 1.4 V.
(f) LEVEL STEP 0.01V.
(5) Set measuring receiver to measure frequency modulation, with + PEAK
detector, no filters.
(6) Adjust the audio analyzer output level for a 100.0 kHz indication on the
TI meter.
(7) If the measuring receiver does not indicate within limits listed in table 18
perform b below.
Table 18. FM Meter Accuracy
Measuring receiver indication
(Hz)
Test description
Min
Max
100 kHz FM meter
85 k
115 k
(8) Press TI keys as listed in (a) and (b) below.
(a) FREQUENCY, 4.0, GHz.
(b) FM DEVIATION MHz OFF.
(9) Set audio analyzer as listed in (a) and (b) below.
(a) Source level 20 mV.
(b) LEVEL STEP 0.1mV.
(10) Press TI FM DEVIATION 10 button. Set the measuring receiver to measure
frequency modulation with +PEAK detector, no filters.
(11) Using the up and down arrow keys, adjust the audio analyzer output level for a
140.0 0.5 kHz FM deviation indication on the measuring receiver.
(12) Set the measuring receiver to FM Ratio mode.
(13) Set audio analyzer to frequencies listed in table 19 and verify that the
measuring receiver indication is within limits listed in table 19.
Table 19. External FM Frequency Response
Measuring receiver
Audio analyzer
indication
frequency
Test description
(Hz)
Min (dB)
Max (dB)
50
Hz
Response
50
-3
+3
120
Hz
Response
120
-3
+3
500
Hz
Response
500
-3
+3
1
kHz
Response
1000
-3
+3
5
kHz
Response
5000
-3
+3
10
kHz
Response
10000
-3
+3
50
kHz
Response
50000
-3
+3
(14) Set audio analyzer as listed in (a) and (c) below.
24
