National Instruments NI USB-6008 User Manual

Also see for NI USB-6008: USER GUIDE AND SPECIFICATIONS Quick guide User guide USER GUIDE AND SPECIFICATIONS USER GUIDE AND SPECIFICATIONS

Contents

National Instruments NI USB-6008 User Manual Manual pdf 24 page image

NI USB-6008/6009 User Guide and Specifications 24 ni.comI/O ProtectionTo protect the NI USB-6008/6009 against overvoltage, undervoltage, andovercurrent conditions, as well as ESD events, you should avoid these faultconditions by using the following guidelines:• If you configure a DIO line as an output, do not connect it to anyexternal signal source, ground signal, or power supply.• If you configure a DIO line as an output, understand the currentrequirements of the load connected to these signals. Do not exceedthe specified current output limits of the DAQ device.National Instruments has several signal conditioning solutions fordigital applications requiring high current drive.• If you configure a DIO line as an input, do not drive the line withvoltages outside of its normal operating range. The DIO lines havea smaller operating range than the AI signals.• Treat the DAQ device as you would treat any static sensitive device.Always properly ground yourself and the equipment when handlingthe DAQ device or connecting to it.Power-On StatesAt system startup and reset, the hardware sets all DIO lines tohigh-impedance inputs. The DAQ device does not drive the signalhigh or low. Each line has a weak pull-up resistor connected to it.Static DIOEach of the NI USB-6008/6009 DIO lines can be used as a static DI or DOline. You can use static DIO lines to monitor or control digital signals. Allsamples of static DI lines and updates of DO lines are software-timed.Event CounterYou can configure PFI 0 as a source for a gated invertor counter input edgecount task. In this mode, falling-edge events are counted using a 32-bitcounter. For more information about event timing requirements, refer to theSpecifications section.