Analog Input (from gas panel and devices to VME)
				8-may-2001
	
The signals will be routed from the gas panel to the breakout boxes via 2-pin BNC-type connectors
(2 pins plus ground shield). At back of box, (+V side is...)
 				
	ADC #	name	function			min	typical	max	voltage range (V)** 
										(see note below)
ADIO #1-B							(psi)
pins (+ --> -)
32-33	1	gpt12	hydrogen bottle pressure	300	1500	2000	(0 --> 5)
34-35	2	gpt2	H2 fill pressure		0	10	20	(0 --> 5)	
36-37	3	gsp1	spare				
38-39	4	gpt3	pump outlet pressure		0	10	20	(0 --> 5)	
40-41	5	gpt9	pump differential press.	-3	0	3	(0 --> 5)	
42-43	6	gpt11	helium cell bottle press.	300	1500	2000	(0 --> 5)	
44-45	7	gpt4	helium cell supply		0	35	50	(0 --> 5)
46-47	8	gpt5	helium cell			0	10 	20	(0 --> 5)		

	ADC #	name	function			min	typical	max	voltage range (V)**
ADIO #2-B (pins are same as above)				(psi)
32-33	1	gpt8	cell-loop diff-press.		-3	0	3	(0 --> 5)	
34-35	2	gpt7	ballast tank pressure		0	10 	20	(0 --> 5)
36-37	3	gpt13	pump inlet pressure		0	10 	20	(0 --> 5)	
38-39	4	gsp2	spare						
40-41	5	gvc1	vacuum gauge 1	(TC1)		?
42-43	6	gvc2	vacuum gauge 2	(TC2)		?	
44-45	7	gvc3	vacuum gauge 3	(cold-cathode)	10^-10	10^-6   10^-2   (0 --> 9)  *** (Torr)	
46-47	8	gvc4	vacuum gauge 4	(convectron)	10^-4	10^-3   1000	(0 --> 8)  *** (Torr)

	ADC #	name	function			min	typical	max	voltage range (V)
ADIO #3  (pins same as above)
	1	ghpcur	HP heater V	(V)		0	20 A	25 A	(0 --> 10)
	2	ghpvol	HP heater I	(I)		0	20 V	40 V	(0 --> 10)
	3	gpcur	Pump I	0			?	
	4	gpvol	Pump V	0			?	
	5	gsp3	spare	
	6	gsp4	spare				
	7	gbcur	beam current	(uA)		0	40	50	(0 --> 5)
	8	gsp5	spare

	ADC #	name	function			min	typical	max	voltage range (V)
ADIO #4  (pins same as above)
	1+	gjt1	JT valve state 1		0%	50%     100%	(0 --> 5)		
	1-	gjt2	JT valve state 2		0%	50%     100%	(0 --> 5)		
	2+	gjt3	
	2-	gjt4	
	3	gsp6    spare
	4	gsp7    spare
	5	gpos1	target position			0	5	10	(0 -->10)
	6	gpos2
	7	gpos3
	8	gpos4


** All pressure transducers are 4-20 mA signals. The corresponding analog input channels
should have a 500 ohm resistor across the input and the gain setting should be +-10 V.

*** Vacuum gauges are nonlinear.
	a) Cold cathode:	(assume HPS 943 w/ 421 sensor from MKS)
				0-9 V DC covers full range or 1-9 V DC logarithmic
				log(P) = V - 11	     (log base 10)
				(typical V = 5-6 V)

	b) Convectron:		(assume Helix 375)
				0-7 VDC, 1 V per decade, or 1-8 V DC nonlinear