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If a special low-pass filter designed for measuring digital amplifiers is unavailable, the measurement must be
performed with a current probe and the input signal frequency must be 2kHz.
Figure 59 Differential output waveform of the Ext_in_IHF_out out loop measurement when speaker is connected.
Figure 60 Single-ended output waveform of the HP_in_Ext_out loop when microphone is connected.
RM-57/58
Nokia Customer Care
BB Troubleshooting and Manual Tuning Guide
Page 6–52
Company Confidential
Issue 1
Copyright ©2005 Nokia. All Rights Reserved.
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