Signal Connections; Analog Inputs - Measurement Computing USB-1208LS User Manual

USB-1208LS User's Guide
The single-ended mode pinout is shown in Figure 4.

Signal connections

Analog inputs

You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 (
through ).
CH7 IN
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 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:
Connect the wire carrying the signal to be measured to

Connect the second wire to

The input range for single-ended mode is ±10V.
To perform a single-ended measurement using differential channels, connect the signal to the "
input, and ground the associated "
Differential configuration
When configured for differential input mode, four analog channels are available. In differential mode, the input
signal is measured with respect to the low input, and delivered through three wires:
Connect the wire carrying the signal to be measured

Connect the wire carrying the reference signal to

Connect the third wire to

A low-noise precision programmable gain amplifier (PGA) is available on differential channels to provide gains
of up to 20 and a dynamic range of up to 12-bits. Differential mode input voltage ranges are ±20 V, ±10 V,
±5 V, ±4 V, ±2.5 V, ±2.0 V, 1.25 V, and ±1.0 V.
Figure 4. Single-ended mode pinout
.
GND
" input.
CH# IN LO
CH# IN LO
.
GND
10
.
CH# IN
.
to CH# IN HI
.
Functional Details
CH0 IN
"
CH# IN HI