Atec Agilent-8563E - Manual (Page 67)

Performance Tests ESG Family Signal Generators
8. Residual FM (ESG-A and ESG-D only)
4-18 Calibration Guide
8. Residual FM (ESG-A and ESG-D only)
This automated test verifies the residual frequency modulation (FM) specification. The
signal generator’s RF output signal is mixed with a signal from a low noise external LO.
The resultant IF signal is demodulated as it passes through the measuring receiver,
bypassing the measuring receiver’s internal mixer which is inherently more noisy. Then
the audio analyzer measures the demodulated audio signal for an RMS voltage. The
measurement is scaled and displayed as RMS mV, but read as residual FM in Hz.
Recommended Equipment
• HP/Agilent 8902A Measuring Receiver Option 010
• HP/Agilent 8903B Audio Analyzer Options 051, 010
• HP/Agilent 8663A Signal Generator
• MD/MDC-174 Mixer (1 to 2800 MHz)
• MD/MDC-164 Mixer (0.5 to 9 GHz)
Equipment Setups
Figure 4-16 Residual FM
≤
2500 MHz Test Setup