Agilent Technologies E4438C - Manual (Page 58)

Performance Tests
Internal AM Accuracy and Distortion
3-10
Internal AM Accuracy and Distortion
These automated tests verify the AM accuracy and distortion specifications.
For frequencies at or below 1300 MHz, accuracy is verified directly with a measuring receiver, and distortion
is verified by measuring the demodulated output from the measuring receiver with an audio analyzer. The
audio analyzer provides a more accurate verification with better resolution than using the measuring receiver
alone.
For frequencies above 1300 MHz, the RF output from the signal generator is mixed with the output from
another signal generator (local oscillator) to produce a suitable input frequency for the measuring receiver.
For a frequency of 4 GHz, verification is accomplished by covering two different frequency spans through the
use of two mixers.
Recommended Equipment
• Agilent 8902A measuring receiver
• Agilent 8903B audio analyzer with Options 010 and 051, or Options 011 and 050
• Use one of the following:
— for models with Option 501, 502, 503, 504 or Option UNJ, use an Agilent 8662A/8663A
high-performance RF signal generator
— for models with Option 506, use an Agilent E4426/E4437 signal generator
• MD/MDC-164 mixer (0.5 to 9 GHz)
• MD/MDC-174 mixer (1.0 to 2.8 GHz)
Equipment Setups
Figure 3-7 Accuracy and Distortion for AM
≤
1300 MHz Setup