ACCEPTANCE TESTING
7-22
Phase modulation
Specification
Range:
0 to 10 radians
Resolution:
3 digits or 0.01 radians
Bandwidth (3 dB):
100 Hz to 10 kHz
Accuracy:
±
5% at 1 kHz modulation rate (excluding residual phase modulation)
Distortion:
Less than 3% at 10 radians at 1 kHz modulation rate
Test equipment
Description Minimum
specification Example
Modulation meter
Φ
M and FM accuracy
±
2% at 1 kHz modulation
frequency
IFR 2305 with
Distortion Option
Phase modulation
Test procedure
(1) Connect the test equipment as shown in
Fig. 7-8.
(2)
On the UUT set source A to:
[Carr
Freq]
10.5
[MHz]
[RF
Level]
0
[dB]
[
Φ
M] [
Φ
M Devn]
10
[rad]
[
Φ
M
ON/OFF]
(3)
On the modulation meter, select CAL,
Φ
M.
(4) Measure
the
Φ
M accuracy and distortion checking that the results are within the
specification shown in
Table 7-34.
(5)
Repeat (2) to (4) for source B.
