Anritsu MG3641A Manual De Usuario
SECTION 7 PERFORMANCE TEST
7-10
7.3.5
AM modulation factor and AM distortion
(1) Test specifications
• Range
0 to 100 %
• Accuracy
with reference to
≥0.4 MHz, ≤ +7 dBm, AM ≤ 90 %,
Source=Int1 1 kHz, and in a 300 Hz to 3 kHz demodulation band:
± (5 % of set value +2 %)
± (5 % of set value +2 %)
• Distortion
with reference to
≥ 0.4 MHz, ≤ +7 dBm, Source=Int1 1 kHz:
< –40 dB (AM=30 %)
< –30 dB (AM=90 %)
(2) Measuring instrument for test
• Modulation analyzer
• Distortion meter
(3) Setup
Fig. 7-5. AM modulation factor and AM Distortion Test
(4) Test procedure
STEP
PROCEDURE
AM modulation factor
1.
Set the MG3641A/MG3642A output level to +7 dBm.
2.
Set the MG3641A/MG3642A frequency and modulation analyzer receive frequency to the
expected frequency.
expected frequency.
3.
Turn on the MG3641A/MG3642A AM, and set Source to Int1 1 kHz.
4.
Set the MG3641A/MG3642A AM modulation factor.
5.
Read the indicator of the modulation analyzer.
6.
Change the MG3641A/MG3642A AM modulation factor and repeat the measurement.
AM distortion
7.
Set the MG3641A/MG3642A AM modulation to 30 % and 90 %.
8.
Measure the demodulation output of the modulation analyzer with the distortion meter.
MG3641A/MG3642A
RF
IN
IN
AF
OUT
OUT
INPUT
Modulation analyzer
Distortion meter
Demodulation
signal
signal