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QA40x User Manual
Revision 1.20
February 2022

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Table of Contents
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Summarization of Contents

Important Things to Know
Model Number
Clarifies terminology regarding QA40x hardware and software.
Ground Reference
Explains the two ground references and their implications for measurements.
BNC Input Voltages
Specifies voltage limits for BNC inputs and warns of damage.
BNC Output Voltages
Describes output characteristics and potential damage from shorting.
Analyzer Front Panel
LEDs
Describes the function of the Link and Run LEDs.
Electrical Characteristics of the Connectors
BNC Inputs
Details the input network's components, impedance, and DC blocking capacitor.
QA40x Basic Controls
Control Region Interaction
Explains scrolling and navigation within the control panel.
Add Measurement Dialog
Filtering Measurements
Explains how to use the filter to narrow down measurement options.
System Annunciator Descriptions
Data Path and Signal Quality
Explains annunciators related to ADC/DAC, input/output signals, and clipping.
Measurement and Acquisition Status
Covers annunciators for FFT size, FR settings, muting, and weighting.
Operational Modes and Settings
Describes annunciators indicating specific operating modes or settings like attenuator, pause, or mirroring.
Control Groups
Axis Settings Interaction
Details how to use up/down controls and context menus for axis settings.
Display Options
Explains how to toggle between time/frequency domains and input/output traces.
Axis Settings
dBV Options
Covers Y-axis units, external gain, and peak display format in dBV.
Acq (Acquisition) Settings
FFT Size and Averaging
Discusses the impact of FFT size and how to use averaging.
Weighting
User Weighting File
Describes the format and usage of custom weighting files.
Measurements
RMS Measurement Options
Details how to configure the frequency range for RMS calculations.
THD and THD+N Measurements
Fundamental Selection
Describes how to determine the primary frequency for THD+N analysis.
Generators
Generator Modes
Lists the four available generator modes: Sine, Multitone, White Noise, Expo Chirp.
Sine Generation
Dual Tone Sine
Explains the use of dual sine tones for IMD measurements.
Multitone
Multitone Settings
Details parameters like tones per octave and total RMS level.
Expo Chirp
Expo Chirp Windowing
Discusses windowing options for Expo Chirp to handle reflections.
Frequency Response Settings
Mask Settings
Explains how to load and use mask files for pass/fail testing.
Full Scale Input
Full Scale Input Controls
Details the input range selection and the active attenuator status.
Run/Stop
Sample Rate Selection
Discusses choosing sample rates and their impact on performance.
Idle Mode Behavior
Explains the idle mode function and output muting.
Front Panel I2S
Details testing I2S devices via the front panel connector.
Cursors
Cursor Controls
Details the functions of Center, Left, Right, and Peak buttons for cursor manipulation.
Soft Keys
Acquisition Control Soft Keys
Covers soft keys for starting/stopping acquisitions and single runs.
FFT Size Soft Keys
Details soft keys for adjusting FFT size.
Marker and Idle Soft Keys
Covers soft keys for marker deletion and enabling idle tone generation.
Navigation Soft Keys
Explains soft keys for scrolling the control panel.

Table of Contents