ACCEPTANCE TESTING
6-22
Carrier frequency offset
Specification
In DC FM mode; less than
±
(1 Hz +0.1% of the set deviation)
Test equipment
Description Minimum
specification Example
Frequency counter
Up to 40 MHz.
ETP 535B or
Aeroflex 2440
Test procedures
(1) Connect the test equipment as shown in Fig. 6-3.
(2) Short circuit the EXT MOD 1 INPUT.
(3) Set the UUT to
[Carrier Freq.]
1.35 GHz
[RF Level]
0 dBm
[FM Devn.]
13.5 MHz, then
proceed as follows:
[Select Source] [Select External] [Ext1 AC Coupling]
[SIG GEN]
(4) Measure and record the carrier frequency on the counter.
(5) Set the UUT to DC coupled EXT MOD 1 INPUT as follows:
[Select Source] [Ext1 DC Coupling]
[DCFM Nulling]
[SIG GEN]
(6) Measure the change in carrier frequency (offset) which must be less than 13,501 Hz.
(7) Change the settings of the UUT as follows:
[Select Source] [Ext2 AC Coupling]
[SIG GEN]
(8) Short circuit the EXT MOD 2 INPUT.
(9) After a 10 second settling period, measure and record the carrier frequency on the counter.
(10) Set the UUT to DC coupled EXT MOD 2 INPUT as follows:
[Select Source] [Ext2 DC Coupling]
[DCFM Nulling]
[SIG GEN]
(11) Measure the change in carrier frequency (offset) which must be less than 13,501 Hz.