			V16 AC LINE VOLTAGE TEST


I. Low Line Regulation Test
	
	a) Load the system to maximum capacity (60-amps @ 5VDC)with the 
	appropriate load resistors.

	b) Connect the system under test to a variac.

	c) Connect a DVM to the AC input of the system and a second DVM to
	the +5VDC supply. Connect an oscilloscope to U15-7 on the Control 
	Logic PCB.

	d) Using the variac, decrease the AC voltage to the system until pin
	7 of U15 goes to a logic 1. Repeat this step 2 or 3 times until the 
	exact transition point is found. Note the AC voltage. It should be
	approximately 87 VAC.

	e) Decrease the AC voltage further and note when the +5VDC supply
  	goes out of regulation. It should be less than 82VAC.



II. Low Line Drop Out Test

	a) Repeat steps a and b from the previous test.
	
	b) Connect a DVM to the AC input of the system under test.
  	
	c) Turn power to the system on and adjust the variac to produce
	an AC voltage of 90 VAC.

 	d) Connect channel A of a scope to U15-7 on the Control Logic PCB.
	Connect channel B of the scope to the +5 VDC supply. Set the scope 
	to trigger on a rising edge of channel A. 

	e) Turn the variac power switch off and note the time for the +5 VDC
	supply to  decay to +4.75 VDC. This time should be greater than 15 mS.

 
