USB-1208LS User's Guide Functional Details
20 CTR
19 GND
18 TRIG_IN
17 GND
16 CAL
15 GND
14 D/A OUT 1
13 D/A OUT 0
12 GND
11
10
9GND
8
CH3 IN LO
CH3 IN HI
CH2 IN LO
7CH2 IN HI
6GND
5CH1 IN LO
4CH1 IN HI
3GND
2CH0 IN LO
1CH0 IN HI
GND 40
GND 31
PC+5V 30
GND 29
Port A7 28
Port B7 39
Port B6 38
Port B5 37
Port B4 36
Port B3 35
Port B2 34
Port B1 33
Port B0 32
Port A6 27
Port A5 26
Port A4 25
Port A3 24
Port A2 23
Port A1 22
Port A0 21
4-channel differential mode pin out
20 CTR
19 GND
18 TRIG_IN
17 GND
16 CAL
15 GND
14 D/A OUT 1
13 D/A OUT 0
12 GND
11
10
9GND
8
CH7 IN
CH6 IN
CH5 IN
7 CH4 IN
6GND
5 CH3 IN
4 CH2 IN
3GND
2 CH1 IN
1 CH0 IN
GND 40
GND 31
PC+5V 30
GND 29
Port A7 28
Port B7 39
Port B6 38
Port B5 37
Port B4 36
Port B3 35
Port B2 34
Port B1 33
Port B0 32
Port A6 27
Port A5 26
Port A4 25
Port A3 24
Port A2 23
Port A1 22
Port A0 21
8-channel single-ended mode pin out
Analog input terminals (CH0 IN - CH7 IN)
You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 (CH0 IN
through CH7 IN). Refer to the pinout diagrams on page 3-4 for the location of these pins.
You can configure the analog input channels as eight single-ended channels or four differential channels. When
configured for differential mode, each analog input has 12-bit resolution. When configured for single-ended
mode, each analog input has 11-bit resolution, due to restrictions imposed by the A/D converter.
Single-ended configuration
When all of the analog input channels are configured for single-ended input mode, eight analog channels are
available. The input signal is referenced to signal ground (GND), and delivered through two wires:
! The wire carrying the signal to be measured connects to CH# IN.
! The second wire connects to GND.
The input range for single-ended mode is ±10V. No other ranges are supported in single-ended mode. Figure
3-3 illustrates a typical single-ended measurement connection.
3-4
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