Engineering Design NIDisk Guia do Utilizador

NIDisktm Direct-to-disk Recorder User Guide Version 3.03 February, 2007 Revised April, 2007 Engineering Design

NIDisk User Guide 4 NIDisk User Guide The NIDisk User Guide (this document) is installed as a PDF (Portable Document Format) file in the \docs directo

NIDisk User Guide 5 4. Acquisition Performing Acquisition To perform an acquisition, select I/O | Acquire on the NIDisk menu. NIDisk displays the Acq

NIDisk User Guide 6 Sample rate may be selected from the drop list of available sample rates in Hz or entered manually. Available sample rates vary w

NIDisk User Guide 7 Triggering allows the user to initiate acquisition manually by clicking OK [Manual] or by applying an external TTL signal [Externa

NIDisk User Guide 8 5. Playback Performing Playback To perform a playback, select I/O | Play on the NIDisk menu. NIDisk displays the Playback paramet

NIDisk User Guide 9 • SIGNAL files are played at their original voltage range, using a conversion factor stored in the SIGNAL file header. • Wave fi

NIDisk User Guide 10 6. Simultaneous Acquisition/Playback About Simultaneous Acquisition/Playback NIDisk can perform simultaneous acquisition and play

NIDisk User Guide 11 Acquisition/Playback Parameter Screen The Acquisition/Playback parameter screen allows the user to specify acquisition duration,

NIDisk User Guide 12 Acquisition/Playback Summary Screen After closing the acquisition/playback parameter screen, NIDisk displays a summary of the ac

NIDisk User Guide 13 During simultaneous acquisition/playback, only the acquisition progress screen is displayed. Elapsed Time Display The meter shows

This document is provided for the sole purpose of operating the NIDisk system. No part of this document may be reproduced, transmitted, or stored b

NIDisk User Guide 14 Here is the meter after recording with low headroom represented by a yellow bar: and here is the meter during an overload condi

NIDisk User Guide 15 the display. The total headroom value is reflected in both the numerical readout and bar display. 8. Acquisition and Playback Tr

NIDisk User Guide 16 4. Acquisition or playback will begin on receipt of the external trigger signal. Triggering an External System from NIDisk Outpu

NIDisk User Guide 17 9. Other Functions Alarm Sounds NIDisk can produce alarm sounds to alert the user to certain acquisition or playback conditions.

NIDisk User Guide 18 (to avoid specifying parameters on the setup screen) and for automation and interfacing with SIGNAL, as described below. Command

NIDisk User Guide 19 will acquire two channels for 60 seconds at 50 kHz sample rate per channel with a gain multiplier of 10, to a two-channel SIGNAL-

NIDisk User Guide 20 RA family commands) to determine when the I/O process has completed and whether it was successful. 11. Operating Hints and Troubl

NIDisk User Guide 21 1. If the I/O device is not present or is not named "Dev1", NIDisk issues the following message: If the device is not

NIDisk User Guide 22 4. If NIDisk has (or may have) terminated abnormally, it may be running as a "phantom" process and preventing other NI

NIDisk User Guide 23 Disk Fragmentation and Maximum Sample Rate On older hard disks, fragmentation can degrade the maximum sample rate. Disks can

LICENSE AGREEMENT THIS IS A LEGAL AGREEMENT BETWEEN ENGINEERING DESIGN AND THE BUYER. BY OPERATING THIS SOFTWARE, THE BUYER ACCEPTS THE TERMS OF T

NIDisk User Guide 24 select the Power Save Mode tab, and move the 4 slider controls associated with Processor Speed to Full, 4) click OK. Running the

NIDisk User Guide 25 Minimum sample rate 100 Hz Maximum sample rate 500 kHz Programmable gain 1, 2, 5, 10, 20, 50, 100 Impedance 100 G-o

NIDisk User Guide 26 the input signal is V(t) = A sin 2πft, then voltage change is dV/dt = 2πfA cos 2πft, whose maximum = 2πfA Volts/sec. So instanta

NIDisk User Guide 27 • SIGNAL can display the entire sound file (see below), which the researcher can use as a roadmap to extract specific sound even

NIDisk User Guide 28 spectrogram with typically 30-60 seconds of sound per screen. This allows the user to navigate through a long recording, spottin

NIDisk User Guide 29 The wide screen and high-resolution spectrogram of the RTS can be used to locate events in sparse data sets. For example, the

NIDisk User Guide 30 The RTS runs within SIGNAL, so sound segments can be transferred easily to SIGNAL buffers for immediate analysis, and measured so

Table of Contents 1. Overview... 1 2. Installation...

1. Overview NIDisktm provides direct-to-disk data acquisition and playback using analog I/O cards from National Instruments. Program capabilities in

NIDisk User Guide 2 • Read file segments into SIGNAL for precision display and measurement NIDisk does not require SIGNAL in order to operate - it

NIDisk User Guide 3 Install NI-DAQmx System Driver and Configure I/O Card NIDisk 3.0 requires NI-DAQmx 8.0 or later. Instructions for downloading and