Model M Manual : Appendix

 

 

Amplifiers And Filters Test

The amplifiers and filters are checked each time that the POWER switch is turned ON. The UPPER COLLARS filter is checked if the filter switch is in the UPPER COLLARS position. The LOWER COLLARS filter is checked if the filter switch is in the LOWER COLLARS position. Internally, an electrical pulse is applied to the input of the electronics so that the amplifiers, filters, microprocessor, battery, printhead and chart drive are tested. The test patterns displayed below are recorded if the battery and electronics are operating properly. The positions of the gain controls do not affect the recorded test patterns. The battery voltage is also displayed. Refer to Section 7 for information on proper battery voltage. The battery must be charged sufficiently to power the red LED light beside the power switch, the electronics and the chart drive motor. If the red LED does not light, the battery must be recharged or the 12-volt external power cord must be used before a proper test can be performed on the electronics system.

	UPPER COLLAR FILTER TEST LIQUID LEVEL FILTER TEST
	LOWER COLLAR FILTER TEST LIQUID LEVEL FILTER TEST