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n To access hidden keypad, pull up display cover. Select POWER, Source, then: n To set reference, push Abs/Rel and hold Set Ref for 3 seconds (3 buzzer sounds). n To display reference, hold Abs/Rel, so Ref flashes. n To stop / start display update, push Hold. n If a test tone is detected, meter will display Hz. AUTOTEST OPERATION ¦ No user action is required for meter to enter Autotest mode. n Autotest: Push Autotest on source and wait a few seconds. n Can also push Autotest on meter for faster