Nokia RM-132 Service Manual & Parts Manual page 209

RM-132; RM-133
BB Troubleshooting and Manual Tuning Guide Nokia Customer Care
Measurement data
Figure 47 Single-ended output waveform of the Ext_in_HP_out measurement when earpiece is connected.
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 48 Differential output waveform of the Ext_in_IHF_out out loop measurement when speaker is connected.
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