QA402 User Manual
6
QA40x Output Voltage Offsets, Click and Pops
The QA40x outputs may exhibited DC offsets up to +/- 2 mV or so. Additionally, operations such as sample rate
changes may generate momentary clicks or pops. If you are working on very high gain stages or driving a power
amp that is driving a speaker, be aware that these offsets, clicks and pops might impact your DUT.
QA40x Analyzer Features
The QA402 is our third-generation analyzer, and the QA403 is our fourth-generation analyzer. They build on
the QA401 by adding additional input and output handling in addition to a front-panel expansion port.
The QA402 and QA403 features:
• Stereo Differential Left + Right Inputs
• Stereo Differential Left + Right Outputs
• 24-bit ADC and DAC for QA402, and 32-bit ADC and DAC for QA403
• Fully Isolated from the PC
• 8 Input Gain Stages, from 0 dBV to +42 dBV full scale (the maximum input is +32 dBV)
• 4 Output Gain Stages, with a maximum output level of +8 dBV (single ended) or +14 dBV balanced.
We hope you enjoy your purchase. Our forum is a great place to learn more about how to use your new
analyzer, or you may contact us at support@QuantAsylum.com. We welcome all questions, no matter how
simple. Analyzers are complex products, and your questions help us improve our products.
Analyzer Front Panel
The front panel of the QA402 analyzer is shown below. The QA403 is similar.
From left to right, the following elements are described below:
LEDs
There are 3 LEDs that glow green when active.
Link LED: This indicates the QA402 is “talking” to the desktop application software.
Run LED: This indicates the QA402 is running an acquisition.
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