Audio Distortion Measurement; Measurement Procedure - Agilent Technologies PSA Series Manual

Audio Distortion Measurement

This procedure describes how to make a Audio Distortion measurement. In this
measurement example, a signal generator is the UUT and is adjusted to deliver a
test signal. Audio Distortion measurement is used to measure and display the
amount of audio distortion applied to the audio signal by performing the ratio of
harmonic and noise power against fundamental power. The measurable frequency
range is from 20 Hz to 250 kHz.
Make sure your input audio signal is under the allowed maximum safe input level
CAUTION
printed near the audio input connector.
You can make Audio Distortion measurements without a Power Meter since it is
NOTE
the PSA that measures the Audio Distortion.
Make sure the input and output impedance are matched. The PSA audio input has a
TIP
high impedance of 100 kΩ. The output impedance of your audio source may
impact the RMS level reading.

Measurement Procedure

Press the Restart key to optimize the measuring receiver configuration if you make
CAUTION
any changes to the UUT or to the measuring receiver settings after you make your
first measurement.
Step 1. Setup the system. See
Step 2. Make sure you have selected
Step 3. Adjust the signal generator to the desired settings for your test.
Step 4. Press
When the measurement is completed, the measurement result will display.
Step 5. To make an accurate measurement, select the appropriate Audio Range. See
on page
Chapter 3
Figure 3-23, "Audio Test Connection
Measuring Receiver
key. Wait for the measurement to be completed.
Audio Frequency
114.
Making Measurements
Audio Distortion Measurement
Diagram.".
mode in the key menu.
MODE
Step 6
115