ACCEPTANCE TESTING
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(4) Measure the AM accuracy and distortion at the frequencies shown in Table 7-38 checking
that the results are within specification.
(5) Set the UUT to [AM Depth] 80% and repeat (4).
(6) Set the UUT to [RF Level] 0 dBm and repeat (4) to (5) using Table 7-39.
(7
) Set the UUT to [RF Level] +6 dBm and repeat (4) to (5) using Table 7-40.
(8
) Set the UUT to [RF Level] +10 dBm and repeat (4) to (5) using Table 7-41.
(9
) Repeat (2) to (8) for source B and, if Option 1 is fitted, source C.
AM scale shape
Test procedure
(1) Connect the test equipment as shown in Fig. 7-9.
(2) On the UUT set source A to:
[Carrier Freq] 100 [MHz]
[RF Level] 0 [dB]
[AM] [AM Depth] 1 [%]
[AM ON/OFF]
(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 7-42, checking that the results are
with
in specification.
(5) Repeat (2) to (4) for source B and, if Option 1 is fitted, source C.
External AM frequency response (ALC off, DC coupled)
Test procedure
100 Hz to 30 kHz
(1) Connect the test equipment as shown in Fig. 7-10.
(2) On the UUT set source A to:
[Carrier Freq] 400 [MHz]
[RF Level] −4 [dB]
[AM] [AM Depth] 80 [%]
[AM ON/OFF]
[UTIL]
[Mod’n Mode]
Press [Down] until “AM external” can be selected
[Select Mode] [EXIT]
[SIG GEN]
[Select Coupling] [Ext DC Coupling] [EXIT]
(3) Set the function generator to give 1 V RMS, 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. Record the absolute reading for use in the formula in
(17).
(6) Set the function generator to each of the frequencies shown in Table 7-43, checking that the
rel
ative readings on the modulation meter are within specification.
(7) Set the UUT RF level to +6 dBm and repeat (3) to (6) using Table 7-44.
(8
) Repeat (2) to (7) for source B and, if Option 1 is fitted, source C.
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General