Watchdog Timers

NetDAS will soon offer NetDAS Watchdog (WD), a timer option to enhance reliability. A WD timer is a circuit that monitors a signal which under normal operation changes state periodically, usually every few seconds. If this signal stops the WD cycles power to the entire system. This cold reboot is almost always is enough to clear the fault and restore normal system operation. Faults can be caused by static, memory overflow, an obscure program bug, a USB synch error, to name the most common.

In a properly designed system faults occur very rarely so the WD is often the only realistic solution. The WD signal is also available externally so other systems may also be rebooted.
NetDAS Watchdog can also be used standalone (without NetDAS).

What is an embedded system?

NetDAS is offered in three operating system versions: embedded Linux, Windows (NetDAS/Windows) and Ubuntu Linux (NetDAS Ubuntu Linux). Embedded systems run "headless" which means they usually do not have a display, keyboard or mouse. Embedded systems are often controlled over the LAN or Internet or with a laptop connected to an Ethernet port. For remote unattended systems NetDAS is the best choice. For systems in the lab a rack-mount system with its own display, keyboard and mouse is often more convenient.

No Data Charges

Cloud computing is a way companies charge customers to access their own data. DAQ Systems has no fees for the data our systems generate and users are free to analyze or process their own data or contract with DAQ Systems for this analysis. This analysis can be as simple as a few peak values or a detailed formal report. For example Poseidon users who operate under FERC regulations may need to provide FERC with graphical plots (seismograms), peak accelerations, spectral analysis or other processed data. DAQ Systems offers training in data analysis for users who want to provide FERC with quick results and basic analysis themselves. For users who prefer to have the analysis done by experts, we also offer certified data reports provided by recognized experts in this field.

Converting to physical units

How do you convert from electronic to physical units?

Data acquisition systems measure a voltage in counts but you want the physical unit. A physical unit is acceleration (m/sec/sec), pressure (Pa), velocity (m/sec), displacement (m) etc.

Example: You measure 209500 counts but what acceleration does this equal? Say your accelerometer has a sensitivity of 0,4 volts/g and your ADC a sensitivity of 838000 counts/volt, what is the acceleration?

In your college physics class you learned to convert units this way:

Acceleration = Counts_Measured X volts/count X g/volt
Acceleration is in g's as the counts and volts cancel each there out leaving you with g's.

Here is the calculation with actual numbers:

g = 209500 X 1/838000 X 1/0,4 = 0,625 g

New NetDAS now online

A NetDAS is now online and available for trying out the NetDAS Tools. These Tools include a graphical viewer, formatter (saves files in several formats to your PC), performance logger as well as other more advanced clients. The input is a triaxial Accel-70 which provides 65 - 70 dB acceleration
data up to 3.6g. The screen shot below shows the real time graphical display.

If you are interested in test-driving NetDAS with practically no effort or cost contact us for further details.

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