Tektronix Camcorder 1780-R Manual do Utilizador descarregar pdf (Página 128)

Measurements

4–16

1780R-Series Operator’s Manual

Noise Measurement

Enter Noise Measurement Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <NOISE> on the screen.

Exit Noise Measurement Mode

To exit Noise mode, push the MEASURE button again. All

instrument settings return to their previous state.

Noise Measurement Procedure

Input the signal to be measured to the 1780R-Series and display on

screen.

Noise can best be evaluated on a constant-luminance portion of the

signal, such as back and front porch, sync tip, or color bars’ white

bar.

Adjust the large knob so that the gap between the waveforms just

disappears. VAR GAIN is automatically set to maximum for lowest

internal noise; Waveform X5 Gain can be selected for better

accuracy with low noise.

Read the signal / noise ratio directly from the on-screen readout.

Measurements

4–16

1780R-Series Operator’s Manual

Noise Measurement

Enter Noise Measurement Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <NOISE> on the screen.

Exit Noise Measurement Mode

To exit Noise mode, push the MEASURE button again. All

instrument settings return to their previous state.

Noise Measurement Procedure

Input the signal to be measured to the 1780R-Series and display on

screen.

Noise can best be evaluated on a constant-luminance portion of the

signal, such as back and front porch, sync tip, or color bars’ white

bar.

Adjust the large knob so that the gap between the waveforms just

disappears. VAR GAIN is automatically set to maximum for lowest

internal noise; Waveform X5 Gain can be selected for better

accuracy with low noise.

Read the signal / noise ratio directly from the on-screen readout.

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