VXI 3002 - Manual (Page 91)

5-16
(8) Set the UUT to RF level +19 dBm and repeat (2) to (5) using Table 5-33.
AM scale shape
Test procedure
(1) Connect the test equipment as shown in Fig. 5-7.
(2) On the UUT set:
Carr Freq 100 MHz
RF Level 0 dBm
Mod Mode AM Internal
Source On
Mod On
AM1 Level 30%
(3) On the modulation meter, select CAL, AM, 300 Hz Þ 3.4 kHz LF filter.
(4) Measure the AM accuracy at the depths shown in Table 5-34 checking that the results are
within specification.
External AM frequency response (ALC off, DC coupled)
Test procedure
100 Hz to 30 kHz
(1) Connect the test equipment as shown in Fig. 5-8.
(2) On the UUT set:
Carr Freq 400 MHz
RF Level −4 dBm
Mod Mode AM External
AM1 Level 80%
Source On
Mod On
DC coupling
(3) Set the function generator to give 1 V RMS, 1 kHz sine wave.
(4) On the modulation meter select CAL, AM, 10 Hz Þ 300 kHz filter.
(5) On the modulation meter check that the AM reading is between 76% and 84%, then set a
reference using the relative function.
(6) Record the absolute reading for use in the formula in (16) below.
(7) Set the function generator to each of the frequencies shown in Table 5-35 checking that the
relative readings on the modulation meter are within specification.
(8) Set the UUT RF level to +7 dBm and repeat (3) to (7) using Table 5-36.
(9) Set the UUT RF level to +13 dBm and repeat (3) to (7) using Table 5-37.