ACCEPTANCE TESTING
5-1-15
INTERNAL AM DEPTH AND DISTORTION
SPECIFICATION
Range: 0 to 99% in 0.1% steps.
Accuracy: For carrier frequencies up to 1 GHz, ±4% of setting ±1% depth. Usable to
1.35 GHz (2030), 2.7 GHz (2031), 5.4 GHz (2032).
Envelope distortion: Less than 3% THD for AM depths up to 80% at 1 kHz modulation
frequency.
Less than 1% THD for AM depths up to 30% at 1 kHz modulation
frequency.
Phase mod on AM: Typically less than 0.1 rad at 30% depth on a 500 MHz carrier.
TEST EQUIPMENT
Description Minimum specification Example
Modulation meter 1.5 MHz to 1 GHz. IFR 2305
Accuracy: Better than 1.1%. + distortion option
TEST PROCEDURES
Fig. 5-1-9 Internal AM depth and distortion test set-up
(1) Connect the test equipment as shown in Fig. 5-1-9.
(2) Set the UUT to [RF Level] 0 dBm [Carrier Freq.] 1.5 MHz [AM] 30%.
(3) Measure the AM depth and the envelope distortion on the modulation meter using
the 50 Hz to 15 kHz filter setting at the frequencies shown in Table 5-1-10.
Check that the measured AM depth and distortion are within specification.
(4) Set the UUT to an AM depth of 80% and repeat (3) above.
(5) Set the UUT to [RF Level] +7 dBm (+4 dBm for instruments fitted with
Option 012) and repeat (3) and (4) above.
Table 5-1-10 AM depth and distortion frequencies
Carrier frequencies (MHz)
1.5 400
31.0 500
43.0 850
200.0 1000
C0332
RF
OUTPUT
UUT
Modulation Meter
RF
INPUT
➤
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