PERFORMANCE TESTS
OUTPUT LEAKAGE TEST 4-11.
The output signal leakage is verified using a 1-inch diameter, two-turn loop. The
induced signal is measured with an RF Spectrum Analyzer and compared to a l-μV
reference established at each reference frequency. The two-turn loop must be 1 inch
away from any surface of the UUT.
REQUIREMENT:
Radiated emissions induce < 1 μV of the signal generator's output signal.
TEST EQUIPMENT:
0.1- to 1050-GHz amplifier
RF spectrum analyzer
Two-turn loop
Type-N termination
A screen room may be required, depending on the RF environment.
REMARKS:
If the UUT fails this test, a feed-through filter is probably broken or an improper
mechanical assembly (i.e., loose screws and/or damaged or misplaced gaskets) is
indicated.
PROCEDURE:
1. Connect the UUT RF OUTPUT to the wideband amplifier input, and connect the
wideband amplifier output to the RF spectrum analyzer input. Use well shielded
cables to avoid leakage that could affect the measurement.
2. Program the UUT to SPCL 909.
3. Program the UUT to -107 dBm.
4. Adjust the RF spectrum analyzer to display the UUT signal for a convenient
reference. Make this adjustment using a vertical scale of 10 dB/division, a
resolution bandwidth of 3 kHz, and a span/division of 5 kHz/division.
5. Disconnect the wideband amplifier from the UUT and terminate UUT OUTPUT
with the type-N termination.
6. Connect the two-turn loop to the wideband amplifier input.
7. Program the UUT to +13 dBm.
8. Verify that the leakage indicated by the RF spectrum analyzer is less than -107 dBm
(1 μV) by moving the two-turn loop over the UUT surface at a distance of 1 inch.
9. Repeat steps 3 through 8 at 14, 20, 40, 80, 160, 320, 550, 640, 700, 850, 950, and
1024 MHz.
4-14
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