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.

Required Test Equipment

Instrument	Critical Specifications for This Test	Recommended Model¹
Measuring Receiver	AM Demodulated Distortion (<50% AM) ≤ 0.3%	8902A
Mixer2	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-164
Local Oscillator2	Frequency Range: 500 to 2500 MHz Amplitude:16 dBm	E8267D

Instrument

Critical Specifications for This Test

Recommended Model¹

Measuring Receiver

AM Demodulated Distortion (<50% AM) ≤ 0.3%

8902A

Mixer2

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-164

Local Oscillator2

Frequency Range: 500 to 2500 MHz

Amplitude:16 dBm

E8267D

Refer to the main equipment list for alternate models.
Not used for ESGs with frequency range < 2 GHz.

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

AM Accuracy CW Frequency > 1300 MHz