ACCEPTANCE TESTING
7-24
AM scale shape
Test procedure
(1) Connect the test equipment as shown in Fig. 7-8.
(2) On the UUT set:
[CARR FREQ] 100 [MHz]
[RF LEVEL] 0 [dB]
[MENU] 20 [ENTER]
The UUT enters the Modulation Mode menu
Select AM int
[MOD] 1 [%]
[SOURCE ON/OFF] (to enable modulation source)
[MOD ON/OFF] (to enable modulation)
(3) On the modulation meter, select CAL, AM, 300 Hz ⇒ 3.4 kHz LF filter.
(4) Measure the AM accuracy at the depths shown in Table 7-33 checking that the results are
with
in specification.
External AM frequency response (ALC off, DC coupled)
Test procedure
100 Hz to 30 kHz
(1) Connect the test equipment as shown in Fig. 7-9.
(2) On the UUT set:
[CARR FREQ] 400 [MHz]
[RF LEVEL]
−4 [dB]
[MENU] 20 [ENTER]
The UUT enters the Modulation Mode menu
Select AM ext using [NEXT]
[MOD] 80 [%]
[MENU] 30 [ENTER]
The UUT enters the Modulation Source menu
Select Ext using [NEXT]
Select 2 to select DC coupling
[MOD]
[SOURCE ON/OFF] (to enable modulation source)
[MOD ON/OFF] (to enable modulation)
(3) Set the function generator to give 1 V RMS (+1 V peak for units with Option 10), 1 kHz sine
wave.
(4) On the modulation meter, select CAL, AM, 10 Hz ⇒ 300 kHz filter.
(5) On the modulation meter, check that the AM reading is between 76% and 84%, then set a
reference using the relative function.
(6) Record the absolute reading for use in the formula in (16).
(7) Set the function generator to each of the frequencies shown in
Table 7-34, checking that the
rel
ative readings on the modulation meter are within specification.
(8) Set the UUT RF level to +7 dBm and repeat (3) to (7) using Table 7-35.
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