Audio Precision ATS-1 User Manual

THD+N (Total Harmonic Distortion plus Noise)
The THD+N function is selected by pressing the FUNCTION
THD+N/SINAD button. It is available in both analog and digital
analyzer modes.
The THD+N function uses a notch (bandreject) filter to eliminate the
fundamental frequency, and then measures the amplitude of signal
remaining. This measurement is known as Total Harmonic Distortion
plus Noise, or THD+N.
The THD+N reading is shown on the top left of the display. The top
left soft key selects the units for the measurement. In addition to the
usual relative and absolute amplitude units, % and dB are provided.
These units measure the amplitude of the filtered signal relative to the
amplitude of the unfiltered signal.
Figure 4-7. Main Panel in THD+N Function
FREQUENCY
COUNTER
NOTCH
FILTER
WEIGHTING
FILTERS
PRIMARY
READING
DETECTOR
BANDWIDTH
LIMITING
FILTERS
GENERATOR MONITORS
B
A
INPUT
RANGING
INPUT
TERMINATION
INPUT
TERMINATION
LCD DISPLAY
AVERAGING
SECONDARY
READING
DETECTOR
INTERNAL
JUMPER
INPUT
MONITOR
SPEAKER/
HEADPHONE
READING
MONITOR
CHANNEL A
CHANNEL B
Figure 4-8. Block Diagram of Analog THD+N Measurement
4 Functions
Function Descriptions THD+N (Total Harmonic Distortion plus Noise)
ATS-1 Dual Domain User's Manual 4-7

Audio Precision ATS-1 Specifications

General

Brand	Audio Precision
Model	ATS-1
Category	Test Equipment
Language	English