User Manual 3153
Using The Instrument 3-8
Enabling the Main
(High) Outputs
3153 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.
For safety reasons, main output default setting is OFF. Disable or
enable the main output using the following command:
OUTPut {OFF | ON}
When the main output state is programmed to ON, the output connector
is connected to the output amplifier through a 50
Ω
resistor and an LED
near the output connector illuminates. In the OFF position, the output
connector is disconnected from the output amplifier by means of a
mechanical relay.
CAUTION
Ensure that voltage is not applied to the main output
connector when the Model 3153 output state is
programmed to ON.
The query:
OUTPut?
queries the state of the main output and returns "0" (OFF) or "1" (ON).
Enabling the Low
Outputs
The Model 3153 has three high-level output connectors that have
amplitude and offset control. Channels 2 and 3 also have low-level
output connectors. The low-level outputs are connected directly from the
DAC through a buffer amplifier. Amplitude from these connectors is fixed
at 2Vpk-pk into 50
Ω
.
The low-level 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.
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