Chapter 3 113
Making Measurements
Audio AC Level Measurement
Audio AC Level Measurement
This procedure describes how to make a Audio AC Level measurement. In this
measurement example, a signal generator is the UUT and is adjusted to deliver a
test signal. Audio AC Level measurement is used to measure and display the true
RMS level of an audio signal. The maximum measurable input level is 3 Vrms.
CAUTION Make sure your input audio signal is under the allowed maximum safe input level
printed near the audio input connector.
NOTE You can make Audio AC Level measurements without a Power Meter since it is
the PSA that measures the Audio AC Level.
TIP Make sure the input and output impedance are matched. The PSA audio input has a
high impedance of 100 kΩ. The output impedance of your audio source may
impact the RMS level reading.
Measurement Procedure
CAUTION Press the Restart key to optimize the measuring receiver configuration if you make
any changes to the UUT or to the measuring receiver settings after you make your
first measurement.
Step 1. Setup the system. See Figure 3-23, “Audio Test Connection Diagram.”.
Step 2. Make sure you have selected
Measuring Receiver mode in the MODE key menu.
Step 3. Adjust the signal generator to the desired settings for your test.
Step 4. Press
Audio AC Level key. Wait for the measurement to be completed.
When the measurement is completed, the measurement result will display.
Step 5. To adjust the measurement settings, press
Meas Setup, then:
1. To change the average number between
On and Off, press the Avg Number key.
When setting to
On, enter the number. The default average setting is Off and the
default number is 25 when switching to
On. When the input signal is changed
during the average period, wait until the averaging is done or the next
averaging period starts.
2. To change the average mode, toggle the
Avg Mode key between Exp and
Repeat. The default average mode is Repeat.
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