Omron V680-HAM42-DRT User Manual page 29

Section 3
Functions and Operation
Test Mode
During system installation or maintenance, the mode switch can be set to 7 (Test Mode) to read ID Tag
data when the power supply is turned ON. The communications results are display on the operation
indicators and the data/error code indicators.
Noise Measurement Mode
If communications with the ID Tags is unstable, set the mode switch to 8 (Noise Measurement Mode).
When the power supply is turned ON, the noise around the Antenna will be measured, and the data will
be shown on the indicators.
Refer to Noise Measurement in this section for information on measuring noise.
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RFID System
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User's Manual