ACCEPTANCE TESTING
7-18
(2) On the UUT set:
[CARR FREQ] 10 [MHz]
[RF LEVEL] 0 [dB]
[MOD] 100 [kHz]
[SOURCE ON/OFF] (to enable modulation source)
[MOD ON/OFF] (to enable modulation)
(3) On the modulation meter, select CAL, FM, 50 Hz ⇒ 15 kHz filter.
(4) Measure the FM accuracy and distortion at the carrier frequencies shown in Table 7-22,
checking that the results are within specification.
FM scale shape
Test procedure
(1) Connect the test equipment as shown in Fig. 7-8.
(2) On the UUT set:
[CARR FREQ] 15 [MHz]
[RF LEVEL] 0 [dB]
[MOD] 100 [kHz]
[SOURCE ON/OFF] (to enable modulation source)
[MOD ON/OFF] (to enable modulation)
(3) On the modulation meter, select CAL, FM, 50 Hz ⇒ 15 kHz filter.
(4) Measure the FM accuracy at the deviations shown in Table 7-23, checking that the results are
with
in specification.
Carrier error
Test procedure
(1) Connect the test equipment as shown in Fig. 7-8.
(2) On the UUT set:
[CARR FREQ] 1200 [MHz]
[RF LEVEL] 0 [dB]
(3) On the modulation meter select CARRIER ERROR. The FREQUENCY display reads
0.00 kHz.
(4) On the UUT set:
[MOD] 100 [kHz]
[SOURCE ON/OFF] (to enable modulation source)
[MOD ON/OFF] (to enable modulation)
[MENU] 20 [ENTER]
The UUT enters the Modulation Mode menu
Select FM ext using [NEXT]
[MENU] 30 [ENTER]
The UUT enters the Modulation Source menu
Select Ext using [NEXT]
Select 2 to select DC coupling
[MENU] 23 [ENTER]
The UUT selects the DC FM Nulling control.
On the modulation meter, measure the carrier frequency error displayed in the
FREQUENCY window, checking that the result is within the specification shown in
Table 7-24.
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