Internal AM Accuracy

The AM accuracy is verified directly with a measurement receiver. For frequencies > 1300 MHz, the RF output from the signal generator is mixed with the output from another signal generator (local oscillator) and downconverted to produce a suitable input frequency for the measuring receiver.

Instrument	Critical Specifications for This Test	Recommended Model
Measuring Receiver	AM Demodulated Distortion (<50% AM) ≤ 0.3%	8902A
Mixer Not used for ESGs with frequency range <2 GHz	RF/LO Freq. Range: 1 to 2800 MHz IF Frequency Range: 1.5 MHz RF 1 dB compression: +8 dBm RF/LO Freq. Range: 500 to 9000 MHz IF Frequency Range: 50 MHz	M/A-COM MDC-174 M/A-COM MDC-164
Local Oscillator Not used for ESGs with frequency range <2 GHz	Frequency Range: 500 to 2500 MHz Amplitude: 16 dBm	E8241A E8244A E8251A E8254A E8247C E8257C E8257D E8267C E8267D 8663A E8663B

Connections and Setup Procedures

All test equipment requires a 30 minute warm-up period to ensure accurate performance.

In the following test setup, direct cable and adapter connections are designated as solid lines. Changeable cable and adapter connections are designated as dashed lines.

Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this test, follow all instructions on the controller display.

Measuring Receiver Calibration Setup

AM Accuracy CW Frequency for <= 1300 MHz and Test Setup

AM Accuracy CW Frequency > 1300 MHz