User Guide

PAMS
Technical Documentation
NME–3
JBD–2 User Guide
Page 10
Issue 1 10/99
RU
HS
RS232
to PC
AIN
AOUT
MIC
SPK
RU
LINE
Switch–Matrix
HSEARP,HSEARN
HSMICP, HSMICN
HFMIC
P
SPKP,SPKN
Figure 5. Routed audio path in HF path
Test Setup
RU
JBD–2
HS
TDC–4
PC
OSCI
Signal
Generator
AIN
AOUT
CH1
CH2
Test Application
One of several measuring possibilities is to test the complete audio path
HFMIC–SPK with the help of a signal generator and an oscilloscope. The
RU must be switched into the internal audio loop between the HFMIC path
and the SPK path. The HFMIC signal has to be injected at AIN AC
coupled. Then measure the SPK signal at AOUT with an oscilloscope.
MicSpk
MicSpk tests the HF path from the RU with the original accessories.
The audio signals (HFMICP & SPKP/N) are routed via matrix to the
handsfree accessories.