Omega Engineering DAQ-12 user manual Channel Bipolar, Gain =

The D/A converter channels may also be operated in unipolar mode: 0 to +5 volts, or bipolar

mode: -5 to +5 volts. The output mode is selected using jumper J5 as shown in Figure 2-5. In addition, a gain selection jumper is provided to select an output gain of 1 or 2. When using an external voltage reference, this gain can be used to amplify the D/A output for small reference voltages.

WARNING: When the internal voltage reference is used,the D/A gain MUST be set to the

gain = 1 position.

5 6 7 8

J5

1 2 3 4

Channel 0 select

Channel 0 gain

Channel 1 gain

Channel 1 select

Figure 2-5. Jumper J5 Configuration

Table 2-3 lists configuration options for jumper J5.

	Channel 0	Channel 1
Bipolar	connect 1-5	connect 3-7
Unipolar	open 1-5	open 3-7
Gain = 1	connect 2-6	connect 4-8
Gain = 2	open 2-6	open 4-8

Table 2-3. D/A Converter Mode Selection Options

When configured for unipolar operation, the output voltage can be calculated from the equation:

Aout = Vref *

For bipolar operation, the equation becomes:

CODE

4096

* gain

Aout =

CODE

2048

- 1 * Vref * gain

DAQ-12 Users Manual 15