User manual

PCIE-1744 User Manual 28
Chapter 4 Operation
4.1 Analog Input Ranges and Gains
Each channel on the PCIE-1744 can measure bipolar analog input signals
ranging within ± 5 V FSR, and can be set up with different input ranges
respectively. The sampling rate can be up to 30 MS/s.
The PCIE-1744 also provides various gain levels that are programmable
on each channel. Table 4-1 lists the effective ranges supported by the
PCIE-1744 using these gains.
For each channel, choose the gain level that provides the most optimal
range that can accommodate the signal range you have to measure. For
detailed information, please refer to Appendix C.4, AI Range Control.
4.2 Analog Input Acquisition Modes
The PCIE-1744 can acquire data in single value, pacer, post-trigger,
delay-trigger, about-trigger and pre-trigger acquisition modes. These ana-
log input acquisition modes are described in more details below.
4.2.1 Single Value Acquisition Mode
The single value acquisition mode is the simplest way to acquire data.
Once the software issues a trigger command, the A/D converter will con-
vert one data, and return it immediately. You can check the A/D FIFO
status (Read BASE+10, 12) to make sure if the data is ready to be
received. For detailed information, please refer to Appendix C.8 FIFO
Control, Appendix C.9 FIFO Status, and Appendix C.10 FIFO for Pro-
grammable Flag.
Table 4.1: Gains and Analog Input Range
Gain Code 12510
Input Range ± 5 ± 2.5 ± 1 ±0.5