Usb Connector; Activity Led; Status Led; Signal Connections - Measurement Computing USB-1208HS-2AO User Manual

USB-1208HS-2AO User's Guide

USB connector

The USB connector provides +5 V power and communication. No external power supply is required.

Activity LED

The Activity LED indicates the communication status of the USB-1208HS-2AO. It blinks when data is
transferred, and is off when the device is not communicating. This LED uses up to 10 mA of current and cannot
be disabled.

Status LED

The Status LED turns on when the device is detected and installed on the computer.

Signal connections

Analog input

You can connect up to eight analog input connections to the screw terminals labeled
Analog signals are referenced to analog ground (AGND).
Single-ended mode requires two wires:

The wire carrying the signal to be measured connects to AINx.

The second wire connects to AGND.
Differential mode requires two wires plus a ground reference:

The wire carrying the positive portion of the differential signal to be measured connects to AINx.

The wire carrying the negative portion of the differential signal to be measured connects to AIN(x+1).

The analog ground reference wire connects to AGND.
The terminal configurations for single-ended and differential modes are shown in the table below.
Channel # 8 single-ended channels configuration 0
Vin+
0 AIN0
1 AIN1
2 AIN2
3 AIN3
4 AIN4
5 AIN5
6 AIN6
7 AIN7
In single-ended mode, the input voltage ranges are ±10 V, ±5 V, ±2.5 V, 0 to 10 V. In differential mode, the
input voltage ranges are ±20 V, ±10 V, and ±5 V. The voltage level on each AINx input is limited to ±14 V
Vin–
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
11
through
AIN0
4 differential channels configuration
Vin+ Vin–
AIN0 AIN1
AIN2 AIN3
AIN4 AIN5
AIN6 AIN7
- -
- -
- -
- -
Functional Details
.
AIN7