USB-231 Analog and Digital I/O User's Guide Document Revision 2 September 2014 © Copyright 2014

10 Chapter 3 Functional Details Analog input acquisition modes The USB-231 can acquire analog input data in two different modes – software paced and

USB-231 User's Guide Functional Details 11 External components The external components on the USB-231 are shown in Figure 3. 1 Screw terminal

USB-231 User's Guide Functional Details 12 Figure 4. USB-231 differential pinout

USB-231 User's Guide Functional Details 13 Figure 5. USB-231 single-ended pinout USB connector The Micro-USB connector provides +5 V power and

USB-231 User's Guide Functional Details 14 Signal connections Analog input You can connect up to eight single-ended inputs or up to four differe

USB-231 User's Guide Functional Details 15 Differential configuration When configured for differential input mode, the input signal is measured

USB-231 User's Guide Functional Details 16 Analog output Figure 8 shows the USB-231 analog output circuitry. Figure 8. USB-231 analog output ci

USB-231 User's Guide Functional Details 17 Figure 9. USB-231 analog output connection diagram Power-on state The AO circuitry exhibits a short

USB-231 User's Guide Functional Details 18 Digital I/O You can connect up to eight digital I/O lines to DIO0 through DIO7. GND is the ground-ref

USB-231 User's Guide Functional Details 19 Trigger input The TRIG terminal is an external digital trigger input. The trigger mode is software-se

2 HM USB-231.docx Your new Measurement Computing product comes with a fantastic extra — Management committed to your satisfaction! Thank you for ch

USB-231 User's Guide Functional Details 20 Figure 12. Connecting the +VO power source load The + 5 V power is always enabled and the voltage is

USB-231 User's Guide Functional Details 21 Mechanical drawings Figure 13. Circuit board (top) and housing dimensions

22 Chapter 4 Specifications All specifications are subject to change without notice. Typical for 25 °C unless otherwise specified. Specifications in

USB-231 User's Guide Specifications 23 Analog output Table 3. Analog output specifications Parameter Condition Specification Resolution 16

USB-231 User's Guide Specifications 24 Digital input Table 5. Digital input specifications Parameter Condition Specification Input voltage ran

USB-231 User's Guide Specifications 25 Memory Table 8 Memory specifications Parameter Specification Data FIFO 2,047 samples (4096 bytes) Non-v

USB-231 User's Guide Specifications 26 Environmental Table 12. Environmental specifications (Indoor use only) Parameter Specification Operating

USB-231 User's Guide Specifications 27 Screw terminal pinout Differential mode pinout Do not connect to terminal block pins labeled NC. Table 15

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3 Table of Contents Preface About this User's Guide ...

USB-231 User's Guide 4 Power requirements ...

5 Preface About this User's Guide What you will learn from this user's guide This user's guide describes the Measurement Computing USB

6 Chapter 1 Introducing the USB-231 The USB-231 is a high-speed data acquisition USB board supported under the Windows® operating system. The USB-231

USB-231 User's Guide Introducing the USB-231 7 Functional block diagram Device functions are illustrated in the block diagram shown here. Figur

8 Chapter 2 Installing the USB-231 What comes with your shipment? Verify that the following hardware components are included in the shipment: Hardwar

USB-231 User's Guide Installing the USB-231 9 2. Plug the smaller end of the Micro-USB cable into the device, and plug the larger connector int