PERFORMANCE TESTS
It is convenient to use the UUT RF ON/OFF control when zeroing the power meter.
PROCEDURE:
1. Program the UUT to SPCL 909, 10 MHz, and -67 dBm.
2. Calibrate, then connect the power meter with a low-level power sensor to the UUT
RF OUTPUT.
3. Zero the power meter.
4. With the power meter, measure the UUT output power (in dBm) and record the
measurement as the variable P.
5. Connect UUT RF OUTPUT through the 50-dB attenuator and the wideband
amplifier to the input of the RF spectrum analyzer. Use well shielded cables to
avoid leakage that could affect the measurement.
6. Adjust the RF spectrum analyzer to display the signal, using a resolution
bandwidth of 1 kHz and a vertical display of 1 dB/Div.
7. Adjust the reference level so that the response is at a convenient reference point on
the display (e.g., 2 dB below top scale). This signal response corresponds to a level
of (P-A) dBm, where A is the value of the 50-dB attenuator.
8. Program the UUT to a level of -117 dBm, remove the 50-dB attenuator, and note
the difference in the resulting response on the RF spectrum analyzer from the
previous response (P-A). The actual UUT output level is (P-A) plus this difference
and should agree with the programmed level to within the requirement.
9. Repeat steps 4 through 8 adding an additional 20-dB attenuator (total 70 dB) to the
UUT RF OUTPUT, and dial the signal generator level to -137 dBm. It may be
necessary to reduce spectrum analyzer resolution bandwidth.
10. Repeat steps 4 through 9 for frequencies of 14, 20, 40, 80, 160, 320, 550, 640, 700,
850, 950,
and
1024 MHz.
ALTERNATE-LEVEL ACCURACY TEST 4-9.
A measuring receiver is used to verify the UUT level accuracy at various amplitude and
frequency settings that test all level ranges of the UUT on all RF bands.
REQUIREMENTS:
Amplitude accuracy is:
<±1.5 dB from 0.5 to 1024 MHz from +13 to -117 dBm
<±3.0 dB from 0.5 to 1024 MHz from -117 to -137 dBm
TEST EQUIPMENT:
• Measuring receiver
• Sensor module
4-10
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