HP Car 3490A SectionIII, Model3490A, Figure 31. 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. SeeFigure
							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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