The parameter " time window gap free " defines the length of individual sweeps in gap-free recordings. These sweeps are an artificial subdivision of the truly gap-free recording. It depends on the amplifier setting. This parameter is not really essential because the voltage is practically never used. It is only stored for each series and displayed on the screen. This value cannot be edited - it is shown for information. These can be read by another program and used for various purposes. Currently the format of the string is example :.
The Stimulation-Sequence Editor. This includes the mean value, the maximum value and the minimum value. These values are displayed in the "message-window".
For very fast stimulation or if you have overflow problems of the interface you turn off the online-analysis with this check-box. How to control the Rs and Cm calculation. Also the method of Rs and Cm calculation is explained there. To avoid errors in the interface comunication it is generally advisable to forbid multiple instances. For analysis-purposes, instead, it might be more useful to allow multiple instances.
Note that this flag works only if the executable is not renamed, i. Activation of this activates an automatic procedure to subtract the capacity based on pulses to a voltage where no ionic currents is expected to flow.
For this, the last segment of the pulse protocol is considered to be at such a voltage and the responses to voltage steps during the other segements is corrected according to the reponse to the last segment, assuming a linear in voltage capacity.
Normally, this should not be necessary, but if the computer tends to crash, or if you have experienced data loss, you may opt to check this flag. An internal "buffer" keeping at most one stimulation sequence can be used to copy stimulation sequences from one pool stored on a file to another or from a data file to a pool.
The latter command copies the pulse protocol from the currently selected tree item if this is an entry or a series into the internal buffer. The " Make train " button can be used to create a train like stimulation by copying the existing segments.
There is no limitation in the number of segments such that e. For each segment the class determines what voltages shall be assigned during the time of the segment. Remote control: reading a command batch file, 'macros', and triggering of macros by digital input. The name of the batch-file is chosen in the settings-dialog. It will be stored in the settings-file along with the other settings if the settings are saved on file.
The commands in these strings are treated identical as the ones saved in the batch file see below. If you have a National Instruments interface and if you have selected "Monitor digital input" in the "Define interface" dialog you can also trigger one or more of these 10 command macros by changing the status of a digital input line.
This will open the batch-file, and read and execute the commands. Add insulation or padding if necessary. Connect the wires to the screw terminals by stripping off 0. Reinstall the strain-relief bar if you removed it and tighten the strain-relief screws. Reinsert the shielding screws to ensure proper shielding. Table illustrates the available switch configurations and the affected signals for each switch setting.
Refer to Table to determine the switch setting that applies to your application, and then refer to the following sections for more information on specific types of signals. Direct feedthrough, with temperature sensor disabled and accessory power disabled.
Temperature sensor disabled, and accessory power enabled 2. Note: This configuration is the factory-default configuration. Switch Configurations and Affected Signals Continued. Single-ended temperature sensor, with accessory power enabled 2. Differential temperature sensor, with accessory power enabled 2. Refer to the device user manual at ni. This chapter describes the types of signal sources that you use when configuring the channels and making signal connections to the SCB, describes input modes, and discusses noise considerations to help you acquire accurate signals.
The following sections describe how to connect signal sources for single-ended or differential DIFF input mode. On most devices, you can software-configure the DAQ device channels for two types of single-ended connections—nonreferenced single-ended NRSE input mode and referenced single-ended RSE mode. RSE input mode is used for floating signal sources. In this case, the DAQ device provides the reference ground point for the external signal.
NRSE input mode is used for ground-referenced signal sources. In this case, the external signal supplies its own reference ground point, and the DAQ device should not supply one. Note Some devices might only support one of the possible input modes. The following sections discuss the use of single-ended and differential measurements and considerations for measuring both floating and ground-referenced signal sources. Figure summarizes the recommended input modes for both types of signal sources.
Refer to the Using Bias Resistors section for information on bias resistors. A floating signal source is a signal source that is not connected in any way to the building ground system, but has an isolated ground-reference point. Instruments or devices with isolated outputs are considered floating signal sources, and they have high-impedance paths to ground. Some examples of floating signal sources are outputs for thermocouples, transformers, battery-powered devices, optical isolators, and isolation amplifiers.
The ground reference of a floating source must be tied to the ground of the DAQ device to establish a local or onboard reference for the signal. Otherwise, the measured input signal varies as the source floats outside the common-mode input range. When measuring differential floating sources, you must configure the device for DIFF input mode.
You can install. In this mode, the negative input of the instrumentation amplifier on the DAQ device is tied to the analog ground. In the factory-default configuration,.
In this configuration, you should connect all signal. In such cases, to move these jumpers to and from the factory-default positions, you must solder and desolder on the SCB circuit card assembly. A grounded signal source is connected in some way to the building system ground; therefore, the signal source is already connected to a common ground point with respect to the DAQ device assuming that the host computer is plugged into the same power system.
Nonisolated outputs of instruments and devices that plug into the building power system fall into this category. The difference in ground potential between two instruments connected to the same building power system is typically between 1 and V, but the difference can be much greater if the power distribution circuits are improperly connected.
If a grounded signal source is incorrectly measured, this difference may appear as a measurement error. The connection instructions for grounded signal sources are designed to eliminate this ground potential difference from the measured signal. When you measure ground-referenced single-ended signals, the external signal supplies its own reference ground point, and the DAQ device should not supply one.
RSE input mode is not recommended for grounded signal sources. Welcome to ManualMachine. We have sent a verification link to to complete your registration. Log In Sign Up. Forgot password? Enter your email address and check your inbox. Please check your email for further instructions. Enter a new password. National Instruments. Worldwide Technical Support and Product Information ni. Warranty The SCB is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation.
Copyright Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written consent of National Instruments Corporation. Patents For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
About This Manual Conventions Contents Single-Ended Connection Considerations Contents Selecting a Resistor This icon denotes a note, which alerts you to important information. This icon denotes a caution, which advises you of precautions to take to avoid injury, data loss, or a system crash. When this symbol is marked on the device, refer to the Safety Information of Chapter 1, Introduction , for precautions to take.
Bold text also denotes parameter names. This font also denotes text that is a placeholder for a word or value that you must supply. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames and extensions, and code excerpts.
On the Slave nodes, a very similar scheduler operates. However, on the Slaves, no timer is used: instead, the Slave scheduler is driven by interrupts generated through the arrival of messages sent from the Master node1. Overall, the S-C architecture is simple and supports number of error-handling mechanisms that make it robust. The network communications follow a TDMA protocol, and the system behaviour is highly predictable.
The presence of significant jitter can have a detrimental impact on the performance of many distributed embedded systems. Similarly Jerri has discussed the serious impact of jitter on applications such as spectrum analysis and filtering.
In this paper, we begin by presenting some empirical data which demonstrates the level of jitter in shared-clock networks implemented as originally described by Pont We begin the paper by describing the methodology used to obtain the results presented here.
Experimental methodology The test platform used in the studies presented in this paper had two nodes: one Master and one Slave. Each node was based on a Phytec board Phytec, supporting an Infineon CC 8-bit microcontroller, with a 10 MHz crystal oscillator. In this case, boards were connected with a twisted-pair CAN link. The CAN baudrate was The scheduler tick interval was 6 ms. In the Slave, we scheduled between one and ten tasks in such a way that the impact of jitter would be maximized.
In all cases, the widths of the resulting pulses was measured using a National Instruments data acquisition card! In each study, consecutive pulse widths were measured to give the results presented in this paper.
When five identical bits e. The receiver controller follows the reverse protocol and removes the stuffed bit after the specified number of identical bits, thereby restoring the original data stream. The choice of data values in this trial needed to be made with care, because of the impact of bit stuffing.
If you do not have a supported release or the required base products, you can get started with a free trial , or you can purchase products.
After confirming you have the system requirements, proceed with either installation option listed below. Clicking the Get Support Package button provides the support package install file: [filename].
The primary difference between using the. Users without an Internet connection can install hardware support packages by following the download instructions.
Support Package Installer installs this support package and all required third-party software. See the hardware support package system requirements table for current and prior version, release, and platform availability.
Test and Measurement Data Acquisition. Select a Web Site.
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