B&K Precision 4040A Manual de Instruções descarregar pdf (Página 16)

OPERATING INSTRUCTIONS

3. Place the EXT MODULATION switch in the released position.

4. Connect a suitable modulating signal to the VCG/MOD INPUT jack on

the front panel.

5. Adjust the modulation level as described previously.

FM OPERATION

The output of the Model 4040 can be frequency-modulated, either by the

internal 1 kHz internal signal or by an external signal applied to the front

panel VCG/MOD INPUT jack.

Internal

1. Set the carrier frequency using the main FREQUENCY controls and

RANGE switches.

2. Engage the MODULATION ON switch and release the MODU-

LATION FM/AM switch.

3. Engage the INT MODULATION switch.

4. The amount of deviation can be varied by rotating the %MODU-

LATION control.

External

1. Set the carrier frequency using the main FREQUENCY controls and

RANGE switches.

2. Engage the MODULATION ON switch and release the MODU-

LATION FM/AM switch.

3. Place the EXT MODULATION switch in the released position.

Figure 6. Examples of AM modulation

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B&K Precision 4040A Manual de Instruções Página 16