Wavetek 39A Spezifikationen PDF herunterladen (Seite 37)

User Manual 301/302

The query:

INSTrument:SELect?

Queries the active channel and returns 1 or 2.

The Control Panel from WaveWiz is shown in Figure 3-5

demonstrates high-level implementation of channel control.

Figure 3.5 Select active channel by clicking on Chan A or B

Enabling the Main

Outputs

301/302 waveforms are generated using data points that are

downloaded to a waveform memory. Using the sample clock

generator, the data is clocked to the digital to analog converter (DAC)

which, in turn, generates the waveform shape that was downloaded to

the arbitrary waveform memory.

The DAC itself can not be connected directly to the main output

because it does not have sufficient drive capabilities, nor does it have

the amplitude and offset control, which is required at the output

connector. To overcome this problem, a high-power output amplifier

circuit is installed directly after the DAC. The amplifier circuit includes

gain, offset, attenuation and stand-by control. The output amplifier is

the circuit that connects to the output connector.

The Model 301/302 also has low-level, auxiliary output connectors.

The low-level outputs are connected directly from the DAC through a

buffer amplifier. Amplitude from these connectors is fixed at 1 Vp-p

into 50Ω.

The auxiliary outputs are used in applications where signal purity and

high signal to noise ratio are crucial. The signal at the output of the

DAC circuit predominantly has these signal qualities. To minimize

damage that may be caused by external misuse of this output, the

signal from the DAC is buffered before it is applied to the low-level

output connector. Waveforms from the Main and Auxiliary outputs are

available at the same time.

For safety reasons, main output default setting is OFF. Disable or

enable the main output using the following command:

OUTPut {OFF | ON}

Configuring The Instrument

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Wavetek 39A Spezifikationen Seite 37