Test Audio Loop-Back-Mc5725V / Mc5727V / Mc5728V / Mc8775V / Mc8785V / Mc8790V / Mc8791V / Mc8792V - Sierra Wireless MC5725 Hardware Integration Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
Note: This procedure describes
steps using the Keithley Audio
Analyzing DMM, 2016-P.
94
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Run ten or more good DUTs through this test proce‐
dure to obtain averaged C/N readings.
· The GPS receiver responds to signal levels from
‐130 dBm to ‐80 dBm.
· Measure C/N five times for each DUT to obtain an
average reading at ‐110 dB.
· Make sure the C/N is less than 15 dB when the signal
generator is off.
· Allow for
problems in the GPS receive path.
Test Audio Loop-back—MC5725V /
MC5727V / MC5728V / MC8775V /
MC8785V / MC8790V / MC8791V /
MC8792V
Note: This procedure segment is performed in Step
Suggested test plan procedure (page
The microphone and speaker audio paths for voice‐enable
modules can be tested by using an audio quantity that is suited
to identify known assembly issues, and applying limits to
detect any problems.
To test the audio paths:
1. Set up the audio analyzer to generate a constant tone:
Connect a BNC cable to the "Source Output" port at
a.
the rear panel.
Press the Source button on the front panel to set the
b.
generator to:
· Ampl = 0.20 V
· Impedance = 50
· Freq = 1.000 kHz
If using a Sierra Wireless Mini Card Dev Kit, connect
c.
the signals as follows:
Proprietary and Confidential
±
5 dB of C/N variation to identify any
84).
Ω
16 of the
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