CDB43131-GBK
DS1155V2DB1
33
5.5.4.5 Headphone Impedance Measurement
The plugin supports both DC and AC impedance measurement. For AC impedance measurement, it supports both
measurement at one frequency or measurement across entire audio band. Any jumpers on headers J28 and J29 should
be removed before starting impedance measurement.
5.5.4.5.1 Measuring DC Impedance
The following steps show how to measure DC impedance. A headphone should be connected to headphone jack J1 on
the CDB43131 board to do the measurement.
1. Set XTAL as MCLK source.
2. Power down headphone, if not already powered down.
3. Enable impedance interrupts by checking Enable Impedance Interrupts check box.
4. Enable impedance subsystem by checking Enable Impedance Subsystem check box.
5. If the ON Status LED turns green, then the impedance subsystem is enabled. Proceed to step 5. Else, the
impedance subsystem did not get enabled. Power cycle the board.
6. Click the Left Channel button to start DC impedance measurement for the left channel.
7. Once the impedance measurement is complete, the measured impedance will be displayed in ohms.
8. Click the Right Channel button if DC impedance measurement of the right channel is desired.
Figure 33 DC Impedance Measurement
Содержание CDB43131-GBK
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