Operating instructions

ACCEPTANCE TESTING
5-11
Amplitude modulation
Specification
Carrier range:
400 kHz to 1.05 GHz
Resolution:
1%
Accuracy
±5% of setting ± 1 digit for modulation frequency 1 kHz, 50%
Test equipment
Description Minimum specification Example
Modulation meter RF I/P 500 kHz to 400 MHz AM Measurement
accuracy up to 85% depth:- ±1% of reading at 1 kHz
mod rate
IFR 2305
UUT
C2587
RF INPUT
BNC
OUTPUT
Modulation meter
Fig. 5-7 Internal AM accuracy checks
(1) Refer to Results table 5-9 on page 5-34. Connect the test equipment as shown in Fig. 5-7
(B
NC output socket on UUT).
(2) Set the UUT to [Rx TEST], RF IN/OUT [SELECT] BNC output, [RF Gen],
[LEVEL] 0 dBm, [FREQ] 1.5 MHz, [Mod Gen], [Gen 2], [FREQ] 1 kHz, [LEVEL] 50%.
(3) Set the Modulation meter to monitor AM in a 0.3 to 3.4 kHz bandwidth.
(4) Check the Modulation meter for a reading within ±7% of setting ± 1 digit.
(5) Repeat step 4, but with the UUT RF generator set to each of the remaining carrier
frequencies shown in the Results table 5-9 on page 5-34.