Agilent Technologies 8935 Series Especificações descarregar pdf (Página 230)

Chapter 8 229

Performance Tests

CDMA Analyzer Modulation Accuracy Performance Test 29

CDMA Analyzer Modulation Accuracy

Performance Test 29

The purpose of this test is to verify that the Test Set meets the

specification limits in PTR (Performance Test Record) Table 9-29,

“CDMA Analyzer Channel Power Level Accuracy Test 28 Record,” on

page 280. This test verifies the performance of the Test Set’s CDMA

analyzer. The CDMA analyzer is performing properly if the rho values

calculated as the results of the following procedure fall within the lower

and upper limits specified in Table 9-29 on page 280.

To determine rho, the signal from the Test Set’s CDMA generator is

compared with a known-calibrated vector signal analyzer. This is done

by setting the Test Set’s CDMA generator in forward channel (QPSK)

mode and then measuring modulation accuracy with the vector signal

analyzer. Since the vector signal analyzer cannot measure rho directly,

the EVM (Error Vector Magnitude) % rms is measured and rho is

calculated from the EVM data.

Setup

Figure 8-34 CDMA Analyzer Modulation Accuracy Test 29

Procedure

1. On the Test Set:

a. Press the

Preset key.

b. Press the

CDMA Gen key. The CDMA GENERATOR screen

appears, see Figure 8-35.

c. Set the RF Gen Freq to 881.52 MHz.

RF IN/OUT

Vector Signal Analyzer

INPUT

DUPLEX OUT

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