GE Vivid S5 N Service Manual page 397

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7-2-4-2-3 TR32 Tests

Beamformer Tests

Receive (RX) Tests

TR32 BF Digital Test

This is an internal test of the Beamformers. Each Beamformer generates an internal test

pattern (first on the TR32A board and then on the TR32B board). This test pattern is

generated through MLA0 and MLA1 to the RFI.

Therefore, in the first phase of the test, the Beamformer on the TR32A board generates a test

pattern signal (while TR32B generates pattern zero).

In the second phase of the test, the Beamformer on the TR32A board generates a test pattern

zero - while the BF on the TR32B board generates a test pattern signal.

Both the test patterns are summed and focused on the BF 32A and generated to the RFI

demodulator.

For test procedure instructions, see the

System BF Digital Test

In this test, both Beamformers are generating internal test patterns. The patterns from the

BF of the TR 32B board are summed and focused in the BF of the TR32A board. From here,

the pattern is generated through MLA0 and MLA1 to the RFI.

For test procedure instructions, see the

The ADC Test is used to check that 1st harmonic, 2nd harmonic, 3rd harmonic, and

background noise are within pre-defined limits.

In this test, a signal is generated from the RFI into the TR switches. For all 64 channels of the

system, each signal goes through the following: pre-amplification, filtering, analog-to-digital

conversion, and focusing. The test signal is at a frequency of 2 MHz.

For test procedure instructions, see the

The RX Test is performed with no probe connected. This is used to check that the signal

values at the input to the TR32 board are as expected.

When performing the RX Test, test signals are generated from the RFI, and the results are

expected to be of fairly high amplitudes with no distortion of the frequency.

For test procedure instructions, see the

Chapter 7 - Diagnostics/Troubleshooting

7-4-4-2-1 "TR32 BF Digital Test" on page

7-4-4-2-2 "System BF Digital Test" on page 7-50

7-4-4-2-3 "ADC Test" on page

7-4-4-3-1 "RX Test" on page

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