Operating instructions

ACCEPTANCE TESTING
5-8 46882-311D
Test equipment
Description Minimum specification Example
Spectrum
analyzer
400 kHz to 3 GHz noise floor better than −
127 dBm at 500 MHz
IFR 2383
50 Ω sealed load
2 turn 25 mm loop
Low-noise FM
demodulator
Residual FM to be less than 2 Hz up to 1 GHz IFR 2305 +
IFR 2041
C2584
UUT
BNC
SOCKET
Spectrum analyzer
Fig. 5-5 Carrier harmonics & spurious check
(1) Refer to Results table 5-6 on page 5-33. Connect the Spectrum analyzer to the BNC socket
on the UUT, as shown in Fig. 5-5.
(2) Set the UUT to [Rx TEST], RF IN/OUT [SELECT] BNC output, [RF Gen],
[LEVEL] 0 dBm, [FREQ] 0.4 MHz. All modulation and noise measurements should be
switched OFF.
(3) Tune the Spectrum analyzer to view the harmonics shown in the second harmonic and third
harmonic column of Results table 5-6, checking that they are within the above specification.
(4) Repeat steps (2) and (3) for the remaining frequencies shown in the table.
(5) Refer to Results table 5-7 on page 5-33. Set the UUT to [Rx TEST], RF IN/OUT [SELECT]
BNC output, [RF Gen], [LEVEL] 0 dBm, [ FREQ] 0.4 MHz.
(6) Use the Spectrum analyzer to check that any spurious signals are <
−
40 dBc. Repeat for
UUT carrier frequencies of 500 MHz and 1000 MHz. Repeat for a UUT carrier frequency of
650 MHz checking that any spurious signals are <
−
30 dBc.