Agilent Technologies E4438C - Manual (Page 75)

Performance Tests
Digital Modulation Level Accuracy
3- 27
Digital Modulation Level Accuracy
This automated test verifies the level accuracy of the signal generator’s I and Q modulation inputs. Two
arbitrary waveform generators provide the I and Q modulation inputs to the signal generator. A power meter
measures the RF output power with and without QPSK modulation applied to the signal generator. The
difference in power measurements is the level accuracy. The QPSK modulation is loaded into the two
arbitrary waveform generators from a data file in the Service Support Software. The vector signal analyzer
verifies the arbitrary waveform generator’s outputs are properly scaled and synchronized before the relative
power level accuracy is measured.
Recommended Equipment
• Agilent E4418B E-Series power meter
• Agilent E9304A E-Series power sensor
• Agilent E4438C ESG vector signal generator with Option 001 or 002,
or Agilent E4430B thru E4437B ESG-D Series signal generator with Option UN8
Equipment Setup
Figure 3-24 Digital Modulation Level Accuracy Setup