HP Car 3490A 3 9 H ; ; 5 E E i F, 10,000ko, SectionII, E F ! ! A, ä - j = ! 9 i l, E ; ? 3 5 fr i F 3 ä, 1 0 0 0 v , 1 0 0 0 k o L

Model34904 SectionII

REMOTEINPUTCONNECTORJ7

oPTtoN 022

F E

l o

r E = ä ; :

e t : u E 3 X : I - -

5 2H* F EI = 6 s i ä 2" - qd E ; ? 3 5 fr i F 3 ä3 9 H ; ; 5 E E i F = =

34904-B-296a

ä - j = ! 9 i l

ä E H ä E ä

t : L i t r				Mating Connector:
E F ! ! A				-hp-	Part No. 1251{O84
=	I	r
*-	q	<	c	Amphenol No. 57-3Ob00-37S
	.
	=	a
	*

LOGIC LEVELS

. lnput Lines: HIGH = + 3.9 V t 1.5 V, 100 pA rnax; or open circuit

LOW = + 0.3 V I 0.3 V, 2 mA rnax.; or contact closure to ground through < 300 A.

Output Lines: HIGH = + 39 V j i.S V, 400 pA nnx. LOW = + 0-3 V 1 0.3 V, 15 mA max.

H after signal name means HIGH is true.

L after signal name means LOW is true.

Outguard ground is isolated from inguard circuit common and chassis (power linel ground and may be floated up to

40 V above chassis.

INPUT SIGNALS

Remote Enable: Continuous LOW input level disables front panel Range, Function, and Sample/Hold controls and enables remote programming of these functions .

Range Programming:
Range	lnput	Logic	Levels	Test No.
	C	B	A
. 1 V , . 1 k s l	H	H	L	2
l V , 1 K O	H	L	H	3
1 0 v , 1 0 k o	H	L	L	4
1 0 0 v . 1 0 0 k o	L	H	H	5
1 0 0 0 v , 1 0 0 0 k o L		H	L	6
10,000ko	L	L	H	7

Autoränge: HIGH input level selects autorange and disables range programming. In Test Function. autorange selectsTest No. 1.

Function Programming:
Function			Input	Logic Levels
			B	A
D		C	L	L
'	r	l	L	H
A		C	H	L
Test			H	H

INPUT SIcNALS (Cont'd)

Sample/Hold Programming (Option O40):

Mode Delay

Track/HoldL H

Acquire/HoldL L

Program Execute: LOW input levelfor minimum of 5 ms initiates outguard-to-inguardtransfer of Range, Func_

tion, and Sample/Hold program information.

Hold: Continuous LOW input level disables autornltic sampling and permits external triggering.

External Encode (Trigger: When ,,Hold,, mode is serec_

ted, "0" input level for minimum of 24O ps initiates one readingcycle.

Sample/Hold Trigger (Option O4O): LOW input levet for

.*' minirpum of 30 ns triggers Sample/Hold circuits and Stretched Pulse Output circuit.

i L .

S/H AC Trigger (Option 040): Negativegoing edge of an input pulse at least 30 ns wide and having an amplitude from 2 V to 15 V triggersSample/Hold circuits and Stretched PulseOutput circuit.

OUTPUT SIGNALS

Program Flag: Changesfrom LOW to HGH at beginning of outguard-to-inguard information transfer. Return to LOW indicates transfer is complete.

Data Flag (Print Commandl: Changes from LOW to HIGH at beginning of measurement,and returns to LOW at completion of a reading cycle.

Stretched Pulse Output (Option 04Ol: Changes from Hf GH to LOW for a minimum ot 24O tts for each Sample/Hold Trigger or S/H AC Trigger input.

Figure2-6. RemoteInput Connestions,Option 022.

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