Measurement Computing USB-201-OEM - Manual (Page 10)

USB-201-OEM User's Guide Functional Details
10
Connector W3
Header connector W3 provides connections for the analog inputs and the analog ground reference.
W3 pin descriptions
Pin Signal name Pin description Pin Signal name Pin description
1 CH0 Channel 0 2 AGND Analog ground
3 CH1 Channel 1 4 AGND Analog ground
5 CH2 Channel 2 6 AGND Analog ground
7 CH3 Channel 3 8 AGND Analog ground
9 CH4 Channel 4 10 AGND Analog ground
11 CH5 Channel 5 12 AGND Analog ground
13 CH6 Channel 6 14 AGND Analog ground
15 CH7 Channel 7 16 AGND Analog ground
Figure 4. Connector W3 pinout
Screw terminal connectors
Screw terminals J1 through J8 are unpopulated. When populated the screw terminals provide alternative
connections to the header connectors. Refer to the Specifications chapter for screw terminal pinouts.
USB connector
The USB connector provides +5 V power and communication. No external power supply is required.
LED indicators
The device has two LED indicators – Status and Activity.
 The
Status LED turns on when the device is detected and installed on the computer.
 The
Activity LED blinks when data is transferred, and is off otherwise.
Refer to Figure 2 on page 9 for the location of these LEDs.
Signal connections
Analog input
You can connect up to 8 single-ended inputs to screw terminals CH0 to CH7 . The input voltage range is ±10 V.
Single-ended mode requires two wires; connect one wire to the signal you want to measure ( CHx ), and connect
a second wire to the analog ground reference ( AGND ).
External pacer I/O
The USB-201-OEM provides one external clock input ( AICKI ) and one clock output ( AICKO ) for the analog
input pacer. You can connect an external clock signal to AICKI .
When using the internal clock, AICKO outputs the ADC sample clock.