Signal Connections; Analog Input - Measurement Computing USB-1608G-OEM User Manual

USB-1608G-OEM User's Guide
Pin Signal Name
1 CH0
2 CH8
3 AGND
4 CH1
5 CH9
6 AGND
7 CH2
8 CH10
9 AGND
10 CH3
11 CH11
12 AGND
13 NC
14 AGND
15 NC
16 AGND
17 NC
18 GND
19 DIO0
20 DIO1
21 DIO2
22 DIO3
23 DIO4
24 DIO5
25 DIO6
26 DIO7
27 GND
28 GND
Do not connect anything to pins labeled "NC".

Signal connections

Analog input

You can configure the analog inputs for SE or DIFF mode. The input voltage range is software selectable for
±10 V, ±5 V, ±2 V, or ±1 V.
With SE mode, connect up to 16 inputs to

Connect one wire to the signal you want to measure (

Connect one wire to the analog ground reference (
With DIFF mode, connect up to eight differential inputs to
two wires plus a ground reference:

Connect one wire to the high/positive signal (

Connect one wire to the low/negative signal (

Connect one wire to the analog ground reference (
Floating voltage source
When connecting DIFF voltage inputs to a "floating" voltage source, make sure the DIFF input channel has a
DC return path to ground. To create this path, connect a resistor from each low channel input to an AGND pin.
A value of approximately 100 kΩ can be used for most applications.
Leave unused input channels either floating or tied to an AGND terminal. Source impedances should be kept as
small as possible to avoid settling time and accuracy errors.
Single-ended mode pinout
Description
Channel 0
Channel 8
Analog ground
Channel 1
Channel 9
Analog ground
Channel 2
Channel 10
Analog ground
Channel 3
Channel 11
Analog ground
No connection
Analog ground
No connection
Analog ground
No connection
Digital ground
Digital input/output 0
Digital input/output 1
Digital input/output 2
Digital input/output 3
Digital input/output 4
Digital input/output 5
Digital input/output 6
Digital input/output 7
Digital ground
Chassis ground
to
CH0 CH15
CHxH
CHxL
Pin Signal Name
29 CH15
30 CH7
31 AGND
32 CH14
33 CH6
34 AGND
35 CH13
36 CH5
37 AGND
38 CH12
39 CH4
40 AGND
41 AGND
42 AGND
43 +5V
44 AGND
45 NC
46 GND
47 AICKI
48 AICKO
49 NC
50 NC
51 TRIG
52 GND
53 CTR1
54 CTR0
55 TMR
56 GND
. SE mode requires two wires:
).
CHx
).
AGND
to
CH0H/CH0L CH7H/CH7L
).
).
).
AGND
12
Functional Details
Description
Channel 15
Channel 7
Analog ground
Channel 14
Channel 6
Analog ground
Channel 13
Channel 5
Analog ground
Channel 12
Channel 4
Analog ground
Analog ground
Analog ground
+5V output
Analog ground
No connection
Digital ground
AI clock input
AI clock output
No connection
No connection
Trigger input
Digital ground
Counter 1
Counter 0
Timer output
Digital ground
. DIFF mode requires