VTI Instruments EX1000A, User Manual

Page: 52 / 320

VTI Instruments Corp.
52 EX10xxA Preparation for Use
Voltage Connections
The EX1000A, EX1016A and EX1032A have 50-pin D-sub receptacles for the voltage input
channels. These channels are differential inputs and are mapped as pairs (see Table 2-3). The center
row of each 50-pin D-sub is connected to chassis GND. This allows for optimized shield termination
when using shielded pair wiring.
P1 Connector P2 Connector P3 Connector
Pin Signal Pin Signal Pin Signal
1 CJC0_RETURN 1 CJC4_RETURN 1 CJC8_RETURN
2 CH07-HI 2 CH23-HI 2 CH39-HI
3 CH07-LO 3 CH23-LO 3 CH39-LO
4 CH06-HI 4 CH22-HI 4 CH38-HI
5
CH06-LO
5
CH22-LO
5
CH38-LO
6 CH05-HI 6 CH21-HI 6 CH37-HI
7 CH05-LO 7 CH21-LO 7 CH37-LO
8 CH04-HI 8 CH20-HI 8 CH36-HI
9 CH04-LO 9 CH20-LO 9 CH36-LO
10
CH03-HI
10
CH19-HI
10
CH35-HI
11 CH03-LO 11 CH19-LO 11 CH35-LO
12
CH02-HI
12
CH18-HI
12
CH34-HI
13 CH02-LO 13 CH18-LO 13 CH34-LO
14 CH01-HI 14 CH17-HI 14 CH33-HI
15 CH01-LO 15 CH17-LO 15 CH33-LO
16 CH00-HI 16 CH16-HI 16 CH32-HI
17
CH00-LO
17
CH16-LO
17
CH32-LO
34 CJC0_INPUT 34 CJC4_INPUT 34 CJC8_INPUT
35 CH15-LO 35 CH31-LO 35 CH47-LO
36 CH15-HI 36 CH31-HI 36 CH47-HI
37 CH14-LO 37 CH30-LO 37 CH46-LO
38 CH14-HI 38 CH30-HI 38 CH46-HI
39 CH13-LO 39 CH29-LO 39 CH45-LO
40 CH13-HI 40 CH29-HI 40 CH45-HI
41 CH12-LO 41 CH28-LO 41 CH44-LO
42 CH12-HI 42 CH28-HI 42 CH44-HI
43 CH11-LO 43 CH27-LO 43 CH43-LO
44 CH11-HI 44 CH27-HI 44 CH43-HI
45
CH10-LO
45
CH26-LO
45
CH42-LO
46 CH10-HI 46 CH26-HI 46 CH42-HI
47 CH09-LO 47 CH25-LO 47 CH41-LO
48 CH09-HI 48 CH25-HI 48 CH41-HI
49 CH08-LO 49 CH24-LO 49 CH40-LO
50
CH08-HI
50
CH24-HI
50
CH40-HI
T
ABLE
2-3: V
OLTAGE
C
ONNECTOR
S
IGNAL
A
SSIGNMENTS
P i n 1
P i n 3 4
P i n 1 8
P i n 1 7
P i n 5 0
P i n 3 3
F
IGURE
2-12: V
OLTAGE
C
ONNECTOR
P
IN
L
OCATIONS
Pins 1 and 34 are used for connecting a remote thermistor to the internal signal conditioning circuits.
This is used when an external cold plate is being used for temperature measurement. The
recommended thermistor is U.S. Sensor P/N: PS103J2 or PS103J2-RoHS. This device is 10 kΩ at
25 °C with ±0.1 ºC initial accuracy and the 0 °C to 50 °C BETA is 3890. The thermistor path, within
the EX10xxA product, is single ended and designed to be connected to an electrically isolated
thermistor. The use of a grounded thermistor is not recommended.