GRAS 12BA, Instruction Manual, Page: 17 / 52

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4 | Accessing TEDS Data
4.1 Setting up for TEDS Data
Channel assignment and TEDS data acquisition requires either the
GRAS Mic Power Module App or Audio Precision’s APx500 mea-
surement software running on the connected PC. The GRAS Mic
Power Module App and the APx500 measurement software can
communicate with the microphone power module using a USB 2.0
interconnection through the module’s USB-C connector. See the
following sections of this document or the APx500 User’s Manual
and the embedded help within the APx500 software for informa-
tion about channel assignment and TEDS data.
When used with the GRAS Mic Power Module App or an APx
analyzer:
•
Microphone input channels are assigned and channel numbers
are displayed on the front panel LED displays above the
measurement microphone BNC input connectors.
• TEDS data can be read from TEDS-enabled microphones.
• Input channels for microphones can be accessed from Signal
Path Setup or through sequence steps in the APx500 software.
When multiple power modules are attached to a PC, the power
module with the lowest serial number will have channel 1 assigned
to the first channel and additional channels will be assigned incre-
mentally across all attached power modules, with the power mod-
ule with the highest serial number configured last. This process is
run when the APx500 software is launched or each time a com-
mand is entered in the Mic Power Module App.
NOTE: To maintain channel assignments when using APx500 software to
access TEDS data and set sensitivity levels, power modules should not be
added or removed from a test setup without closing and then relaunching
the APx500 software.