HP Car 3490A manual SectionIII Model3490A, Front and RearPanel

SectionIII Model3490A

1 .	Line Switch, push on/push off.			.'^".	.	. _ . 8 .	Guard terminal,
2 . Sample Rate Control. Maximum sample rate is selected in					i\ -	9 .	InPut terminals .
	clockwise position. Each counterclockwise step adds a					10 . Function Switch .
	known delay.
J . Manual Trigger Pushbutton in center of Sample Rate						11 . Thermal Adjust . SeeParagraph3 - 41 .
	control .					'
						2. Rear Panel input connector in parallel with front
4 .	Sample/Hold Switch (Option o4o/045). Selects Sample/						terminals . Included with Options 020 or 030 . See Figure
							2 - 7 .
	Hold mode .
5 .	Ratio Switch	(Option	0801. Selects internal	or external		13.	Line voltage selection switch. gee Figure 2-1.
	referen@.					14 . Remote Input connector J7 (Option 0201 . See Figure
6 .	Range Switch keys.						2-6.
						15 . Line fuse .
						16, AC power @nnector.
	The Range Switch keys are interlocking . That					17 . Data Output connector J6 (Option 0201 . See Figure 2 - 5 .
	is, when one range key is pressed, the Previ-
	ously selected key is released .Do not pull up					18 . General Purpose Inter{ace Bus connector J12 (Option
	on a range key, or mechanical damage will
							030) . See Figure 2 - 9 .
	result -
	a Signal or	External	Reference (Option	O80l input		19 . Trigger Input connector J1 l (Option 030 or 045) . See
	terminals .						F i g u r e s2 - l 0 a n d 2 ' 1 1 .

Figure 31. Front and RearPanel.

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