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70 Chapter 3
Overview of the Test Set’s Built-In Tools
Using the Voltmeter and Audio Frequency Counter
Using the Voltmeter and Audio Frequency Counter
The voltmeter can be used to measure ac and dc voltages. The input to
the voltmeter is determined by the AF Anl In field on the AF
ANALYZER screen.
To measure external voltages:
1. Select the AF ANALYZER screen.
2. Set the AF Anl In field to Audio In.
3. Set the Audio In Lo field to match the source you are measuring
(600 ohm impedance, floating output amplifier, ground referenced
voltage). See the "Audio In Lo" field on page 127 for more
information.
4. Connect the signal to be measured to the AUDIO IN connector(s).
The AUDIO IN HI connector can be used alone as long as the Audio
In Lo field is set to Gnd. The AUDIO IN LO connector must also be
used if the Audio In Lo field is set to 600 to Hi or Float.
The ac level is displayed. See Figure 3-4 .
5. Select the lower-right measurement display field. See Figure 3-4 .
• Select DC Level to display the dc level.
• Select AF Freq to display the audio frequency.
Figure 3-4 Measuring AC and DC Voltages
Set to
Audio In.
AC Level
Set to
DC Level or
AF Freq.
Set to match
source.
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