Selecting the right shake table for research, testing, and educational purposes requires careful consideration of design, performance, longevity, and overall user experience. Both QuakeLogic/TDG and Quanser offer bi-axial shake tables, there are key differences that make the QuakeLogic/TDG Portable Bi-Axial Shake Table (Servo Motor) the clear choice for clients seeking a superior, user-friendly, and high-performance solution.

Below, we outline the primary advantages that set our equipment (shown on the left) apart from Quanser’s (shown on the right).

1. Higher Operating Frequency and Larger Payload Capacity

QuakeLogic/TDG’s biaxial shake table operates at a maximum frequency of 20 Hz, which is double that of Quanser’s biaxial shake table II (10 Hz). This higher frequency allows for a wider range of testing scenarios, especially when high-frequency vibrations or accelerations are involved.

Additionally, our equipment offers a larger payload area of 500×500 mm and a maximum stroke of ±100 mm, enabling the testing of larger and heavier models. Quanser’s smaller payload area (460×460 mm) and smaller stroke (±76.2 mm) limit its capacity to accommodate similar testing scenarios.

QuakeLogic/TDG’s shake table has a capacity of 50 kg at 2g peak acceleration simultaneously in both the X and Y directions. In contrast, Quanser’s shake table can only achieve a maximum acceleration of 1.0g in the X direction and 2.5g in the Y direction with a significantly lower payload of 7.5 kg. This makes our shake table far superior in terms of handling larger payloads with higher and more balanced acceleration across both axes. In fact, at 7.5 kg payload our shake table can achieve more than 4 g acceleration in both the X and Y directions.

2. Software Integration: EasyTest Software vs. Third-Party MATLAB Solutions

One of our biaxial shake table’s greatest strengths is the inclusion of its proprietary EasyTest Software, which provides an intuitive, comprehensive interface for operating the shake table. EasyTest is fully integrated with the hardware, meaning there is no need for costly third-party software.

On the other hand, Quanser’s system requires the purchase of MATLAB/Simulink, along with toolboxes to operate the system. This dramatically increases the overall cost and complexity of using the system. QuakeLogic/TDG’s system is ready to use out of the box.

3. Durability and Dust Protection

Durability is another area where QuakeLogic/TDG’s system excels. Our Portable Bi-Axial Shake Table is equipped with dust covers that protect the internal components from environmental contaminants, extending the system’s operational life. These protective features ensure consistent performance over time, even in challenging environments.

By contrast, Quanser’s shake table has exposed components, including rails, making it more susceptible to dust, debris and falling objects during the testing. Over time, this exposure can degrade the system’s performance and shorten its lifespan, leading to higher maintenance costs and reduced reliability.

4. Remote Control and User-Friendly Operation

The QuakeLogic/TDG system is IP-based, allowing for remote control and monitoring—an essential feature for modern testing environments. This flexibility enables users to operate the system remotely, improving the efficiency and convenience of testing workflows.

Furthermore, QuakeLogic’s EasyTest Software ensures that users can quickly set up and conduct tests without needing specialized programming skills or additional training. Quanser’s reliance on MATLAB/Simulink, however, adds an extra layer of complexity and operational difficulty.

5. Aesthetic and Practical Design

QuakeLogic’s Portable Bi-Axial Shake Table boasts a compact, visually appealing design with a dust-protected structure, making it ideal for educational and research labs. In contrast, Quanser’s system, with its exposed components, is not only less visually appealing but also less practical in terms of maintenance and long-term durability. QuakeLogic’s polished and professional appearance reflects the advanced engineering inside, making it the better option for clients who value both form and function.

6. Comparing Technical Specifications

When comparing the technical specifications of QuakeLogic/TDG’s shake table with those of Quanser’s, the differences are striking:

Feature	Quanser Biaxial Shake Table II	QuakeLogic/TDG Portable Bi-Axial Shake Table
Dimensions	610 x 460 mm x 130 mm	800 x 800 x 225 mm
Total Weight	27.2 kg	78 kg
Top Stage Dimensions	460 x 460 mm	500 x 500 mm
Maximum Travel (Stroke)	±76.2 mm	±100 mm
Maximum Acceleration	2.5 g with 7.5 kg payload	±2 g with 50 kg payload ±1 g with 100 kg payload
Maximum Velocity	399 mm/s	1,000 mm/s
Operational Bandwidth (Frequency)	10 Hz	20 Hz

8. Conclusion: A Superior and Cost-Effective Solution

In comparing the QuakeLogic/TDG Portable Bi-Axial Shake Table with the Quanser Biaxial Shake Table II, QuakeLogic’s advantages are evident. With a specifically engineered bi-axial design, integrated EasyTest software, superior mechanical components, dust protection, and greater operational frequency and payload capacity, our system delivers a high-performance yet cost-effective solution.

Clients such as NOKIA-BELLS-LAB have praised the ease of setup and exceptional performance of our shake table. The EasyTest software stands out for its intuitive design, allowing users to focus on testing rather than on lengthy configurations or troubleshooting.

For anyone in need of a reliable, easy-to-use shake table that minimizes setup time and maximizes operational efficiency, QuakeLogic’s Portable Bi-Axial Shake Table is the ideal choice. Its seamless user experience and long-term reliability make it perfect for research institutions, universities, and industries dedicated to seismic and vibration analysis.

To learn about our biaxial shake table, please visit the product page HERE.

Reference:

Technical specifications for the Quanser Shake Table II were sourced from the official Quanser website.

When dealing with measurement systems—whether for seismic monitoring, environmental sensors, or industrial applications—it is essential to understand key technical specifications such as the dynamic range of both analog sensors and data loggers.

The dynamic range plays a critical role in determining the accuracy and sensitivity of your measurement system. In this blog post, we’ll explore what the dynamic range is, why it matters, and how it relates to both analog sensors and data loggers.

Additionally, we’ll cover the role of gain values in data loggers, and explain the significance of decibels (dB) and bit resolution, including 24-bit and 32-bit resolution, in improving data quality.

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What is the Dynamic Range of an Analog Sensor?

The dynamic range of an analog sensor refers to the ratio between the smallest and largest signals that the sensor can accurately measure. In other words, it represents how sensitive the sensor is to both weak and strong signals, without losing fidelity or generating too much noise. Dynamic range is typically expressed in decibels (dB) and is a critical specification, as it tells you how well the sensor can detect subtle variations in the physical parameter it is measuring—whether it’s vibration, temperature, pressure, or another input.

• Low-End Detection: The smallest signal detectable by the sensor, known as the noise floor.
• High-End Detection: The maximum signal the sensor can measure before it saturates.

Real-Life Example: Let’s consider a seismic accelerometer used to detect ground vibrations. Suppose the dynamic range of the sensor is 130 dB. This means the accelerometer can measure both very faint ground movements caused by small earthquakes, as well as strong ground shaking from large seismic events. A sensor with a low dynamic range would struggle with capturing weak signals and could easily become overwhelmed by strong vibrations, leading to data loss.

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Dynamic Range of a Data Logger

The dynamic range of a data logger refers to the range of input signals that the logger can record and store without distortion. The dynamic range in data loggers is crucial because it determines the extent of accurate data recording, across both very weak and very strong signals coming from the sensor. This is particularly important when the signal you are measuring fluctuates in intensity, such as during an earthquake or in a dynamic industrial environment

While sensors convert physical parameters into electrical signals, it is the data logger’s job to capture these signals and store them for later analysis. The dynamic range of the data logger determines how well it can handle the full spectrum of signal intensities coming from the sensor.

• Resolution: The resolution of a data logger is closely tied to its dynamic range. Resolution is typically measured in bits (e.g., 12-bit, 16-bit, 24-bit, 32-bit). The higher the resolution, the more detailed the logger’s recording capability, and the better it is at differentiating between small variations in the signal.

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Understanding Decibels (dB) in Dynamic Range

What is dB?
Decibels (dB) are a logarithmic unit used to express the dynamic range. Since dynamic range involves very large ratios (e.g., the ratio between the smallest detectable signal and the maximum signal), using a linear scale would be impractical. The decibel scale compresses this large range into a manageable number that is easier to interpret.

How Does dB Affect Data Quality?

• A higher dynamic range in dB means the system can handle a wider range of signals, from the weakest to the strongest, without distorting the data.
• For example, a seismic sensor with a dynamic range of 140 dB can capture both the faintest microtremors and the strongest ground shaking from an earthquake without losing data fidelity.
• If the dynamic range is too low, the system may either miss faint signals or distort strong signals, leading to compromised data quality.

Example: Consider two sensors, one with a dynamic range of 80 dB and another with 120 dB. If both are used to measure faint vibrations in a laboratory setting, the sensor with the lower dynamic range might fail to detect some of the subtler movements, while the sensor with 120 dB will capture the full range of vibrations without losing data.

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How Gain Affects the Dynamic Range in Data Loggers

Gain is a crucial setting in a data logger that amplifies the incoming signal from the sensor. By increasing the signal, gain allows the data logger to make better use of its dynamic range. However, if gain is set too high, it can push the signal beyond the logger’s maximum recording capacity, resulting in distortion or “clipping” of the data.

Conversely, if the gain is set too low, weak signals may not be amplified enough, making them indistinguishable from background noise. A well-calibrated gain setting ensures that the logger uses its entire dynamic range effectively.

Example: In a vibration monitoring system for machinery, if the incoming vibrations are too weak, increasing the gain will make those small signals more distinguishable to the data logger, allowing for more accurate diagnostics of potential machinery faults. On the other hand, if the gain is too high, strong vibrations could overwhelm the data logger, causing it to miss critical details about how the machinery is behaving.

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Understanding Bit Resolution and the Importance of 24-Bit and 32-Bit Resolutions

What is Bit Resolution?

Bit resolution refers to the ability of a data logger to measure variations in the input signal. It determines how finely the signal can be divided into discrete levels. The number of bits indicates how many levels the signal can be segmented into, with higher bit resolution offering more precision.

For example:

• A 12-bit data logger divides the signal into 2^12 (4096) discrete levels.
• A 24-bit data logger divides the signal into 2^24 (16,777,216) discrete levels.
• A 32-bit data logger divides the signal into 2^32 (4,294,967,296) discrete levels.

How Does Bit Resolution Impact Data Quality?

Higher bit resolution allows a data logger to capture finer details in a signal, leading to more accurate and precise data representation. A logger with higher bit resolution, such as 24-bit or 32-bit, is capable of distinguishing subtle variations in the input signal that lower-resolution loggers might overlook or misinterpret.

24-Bit Example:

In applications such as seismic data logging, where capturing even the smallest ground motions is essential, a 24-bit data logger is highly preferred. Its higher precision enables it to detect micro-level vibrations that a lower-resolution logger (such as 16-bit) might miss. For instance, a 16-bit logger might round off or fail to capture these small variations, resulting in a loss of crucial information, particularly when dealing with low-amplitude signals.

32-Bit Example:

A 32-bit data logger takes resolution even further, dividing the signal into billions of discrete levels. This becomes particularly useful in high-precision applications where extremely wide dynamic ranges are involved, such as in research laboratories, aerospace, or when recording large seismic events. During an earthquake, for example, a 32-bit logger ensures that even the smallest ground tremors are captured with the same accuracy as the highest-intensity movements. This wide dynamic range ensures no data is lost, even when dealing with both very weak and very strong signals simultaneously.

Conclusion: The Value of Higher Bit Resolutions

Both 24-bit and 32-bit resolutions significantly improve the precision and quality of data capture, especially in scenarios requiring detailed and high-dynamic-range signal recording. The higher the bit resolution, the more granular the data, making it easier to capture both subtle and high-amplitude signals accurately. In high-stakes applications like seismic monitoring or scientific research, utilizing a data logger with the appropriate bit resolution—such as 24-bit or 32-bit—ensures you obtain the most accurate and actionable data possible.gger can accurately capture both the small aftershocks and the intense main event, providing a comprehensive picture of the seismic activity.

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Real-Life Applications and Examples

1. Seismic Monitoring in Earthquake Zones
   In seismic monitoring systems, both the sensors and the data loggers need to have a wide dynamic range and high resolution. Earthquakes can generate both very small ground movements (microtremors) and extreme shaking during a large event. For example, high-quality seismic systems may use accelerometers with a dynamic range of up to 140 dB and data loggers with 24-bit resolution, ensuring they can capture a full range of ground motion accurately. The gain settings in the data logger would be adjusted based on the expected magnitude of the earthquakes.
2. Industrial Vibration Monitoring
   In an industrial setting, such as a manufacturing plant, monitoring machinery vibrations is key to predictive maintenance. Sensors might have a dynamic range of around 120 dB to detect both subtle vibrations caused by early-stage faults and stronger signals from fully developed mechanical issues. The data logger’s dynamic range would need to match or exceed this to ensure that no data is lost during high-intensity events. A 24-bit data logger would provide the fine precision needed to detect even the smallest anomalies in vibration patterns.
3. Environmental Monitoring in Remote Locations
   For environmental monitoring, where temperature, humidity, or air pressure needs to be tracked over time, the dynamic range of both the sensors and data loggers should be sufficient to handle extreme changes, particularly in remote areas with harsh climates. A 24-bit data logger can ensure that even minute changes in temperature or pressure are recorded with high precision, providing more reliable data for long-term studies.

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Conclusion

Understanding the dynamic range of both analog sensors and data loggers, as well as the impact of bit resolution (e.g., 24-bit), is crucial for designing accurate and reliable measurement systems. Whether you are monitoring seismic activity, industrial machinery, or environmental conditions, these specifications define the limits of what you can measure and record.

• Dynamic Range of Sensors: Defines the range of physical inputs (e.g., vibrations, temperature) the sensor can detect.
• Dynamic Range of Data Loggers: Determines the range of sensor outputs that can be accurately recorded and stored.
• dB and Resolution: Higher dB values and higher bit resolutions (e.g., 24-bit) mean better sensitivity and more precise data recording.
• Gain Settings: Allow fine-tuning of the system to optimize performance for the expected signal strength.

By selecting components with compatible dynamic ranges and optimizing gain and resolution settings, you can ensure high-quality, precise data collection across a variety of real-world applications.

For more information about optimizing your system’s dynamic range and choosing the right data logger and sensor, feel free to reach out to us at QuakeLogic. We specialize in advanced monitoring systems designed for reliability and accuracy across diverse fields.

About QuakeLogic

QuakeLogic is a leading provider of advanced seismic monitoring solutions, offering a range of products and services designed to enhance the accuracy and efficiency of testing, data acquisition, and analysis.

Contact Information:

• Email: sales@quakelogic.net
• Phone: +1-916-899-0391
• WhatsApp: +1-650-353-8627
• Website: www.quakelogic.net

For more information about our products and services, please visit our website or contact our sales team. We are here to help you with all your testing and monitoring needs.

Earthquakes are unpredictable, but your facility’s response doesn’t have to be. Implementing an Earthquake Early Warning System (EEWS) is essential for protecting your employees, infrastructure, and operations from seismic events. However, simply having the technology in place isn’t enough—having a clear, comprehensive policy ensures that everyone knows exactly how to respond when an earthquake occurs.

An Earthquake Early Warning System Policy provides critical guidelines for the operation, maintenance, and response protocols associated with advanced technologies like P-ALERT family sensors and PX-01 Cube wall-mount display and alarms. This policy outlines how the system functions, where it’s installed, who’s responsible for it, and—most importantly—how to react when an alert is triggered. Without a well-defined policy, even the best early warning systems can fail to deliver their full potential in safeguarding lives and assets.

Having a structured policy ensures:

• Clear responsibilities for personnel at every level
• Efficient use of warning time provided by earthquake alerts
• Consistent, rehearsed responses through regular drills and training
• Ongoing system maintenance and improvements based on real-world feedback

Below is a sample policy that you can use as a starting point to implement an earthquake early warning system using our technologies. It’s designed to keep your people safe and your facility prepared in the face of seismic events.

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Implementing an Earthquake Early Warning System: Sample Policy

When it comes to protecting your facility from the unpredictable nature of earthquakes, having an effective Earthquake Early Warning System (EEWS) can make all the difference. With the right technology, you can significantly reduce the risk of injuries, protect your infrastructure, and ensure operational continuity. Below is an example of a comprehensive policy that can be implemented using the P-ALERT earthquake detection sensor and PX-01 Cube wall-mount display and alarm technologies.

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Objective:

The primary goal of this policy is to establish a robust earthquake early warning system that leverages P-ALERT sensors and PX-01 Cube displays. The system aims to provide timely warnings that will allow personnel to take protective actions and reduce potential damage to critical assets.

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Scope:

This policy applies to all employees, contractors, and visitors on-site, addressing the installation, operation, and ongoing maintenance of the earthquake early warning system.

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System Overview:

1. P-ALERT System:
   The P-ALERT is an advanced P-wave detector designed to detect seismic activity at its earliest stages. It uses cutting-edge Pd technology and can identify the less-damaging P-waves before the more destructive S-waves hit. Once an event is detected, P-ALERT sends signals to the PX-01 Cube for immediate action.
2. PX-01 Cube:
   The PX-01 Cube is a smart wall-mounted alarm that can operate as a standalone device or as part of a central network. It displays earthquake warnings, countdowns for S-wave arrivals, and other critical information like tsunami alerts and aftershock warnings, providing a clear and actionable interface during emergencies.

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System Installation and Configuration:

1. Sensor Placement:

• Install P-ALERT devices at critical structural points to ensure complete coverage and reliable detection.
• High-occupancy areas and vital infrastructure should be prioritized during sensor deployment.

1. PX-01 Cube Location:

• PX-01 Cube units should be placed in highly visible locations such as control rooms, hallways, and entry points.
• Ensure that alarms and visual warnings are prominently displayed to all personnel.

2. Network and Power Redundancy:

• Connect the PX-01 Cube to a local network for real-time data flow between P-ALERT devices and the central warning system (if applicable).
• Equip the system with an Uninterruptible Power Supply (UPS) to maintain functionality during power outages triggered by seismic events.

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Alert System Functionality:

1. P-Wave and S-Wave Detection:
   The system provides a layered response:

• P-Wave Detected: The PX-01 Cube will display countdown information, giving employees vital seconds to prepare for the S-wave.
• S-Wave Alarm: The alarm will immediately activate once the S-wave is imminent, prompting personnel to take action.

2. Additional Display Capabilities:
The PX-01 Cube can also display essential information such as:

• Alerts from a USGS earthquake early warning system

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Procedures for Action During an Earthquake Alert:

1. Phase 1: P-Wave Alert (Pre-Earthquake Warning)

• The PX-01 Cube will sound an alarm and display countdown information.
• Employees should cease any hazardous activities, move away from unsafe areas, and follow pre-determined safety procedures.
• Designated staff should secure high-risk materials and equipment.

2. Phase 2: S-Wave Alarm (Shaking Imminent)

• The S-wave alarm signals immediate danger. Employees must take cover using the Drop, Cover, and Hold On protocol.
• Personnel outside buildings should move to safe, open spaces.

3. Phase 3: Post-Earthquake

• After the shaking stops, supervisors will assess the damage and determine whether an evacuation is necessary.
• Employees will gather at designated evacuation points for further instructions.

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Roles and Responsibilities:

1. Safety Committee:

• Oversee the system’s implementation and conduct regular policy reviews.
• Ensure all staff are trained and prepared for earthquakes through drills.
• Adjust policies based on feedback from post-event reviews.

1. System Administrators:

• Maintain and monitor the system’s functionality, ensuring that sensors and displays are always operational.
• Troubleshoot any connectivity issues between P-ALERT and the PX-01 Cube.

2. Employees:

• Participate in regular earthquake drills and training.
• Respond quickly and appropriately to alarms.
• Report any technical problems with the system.

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Maintenance and Testing:

1. Routine System Testing:

• Test the system monthly to confirm operational readiness.
• Perform annual inspections of all hardware and software.

2. Drills and Training:

• Conduct earthquake drills quarterly to ensure employees understand the system and know how to respond.
• Provide onboarding training for new employees.

3. Issue Reporting:

• Employees should report any malfunction or false alarms immediately.
• System administrators will maintain a log of issues and resolutions for continuous improvement.

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Continuous Improvement:

1. Post-Earthquake Review:
   After any significant seismic event, the safety committee will review the performance of the EEWS, evaluate employee responses, and identify areas for improvement.
2. Annual Policy Update:
   The policy will be reviewed annually or after any major earthquake to incorporate advancements in technology and updated best practices.

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Conclusion:

Implementing an earthquake early warning system using P-ALERT and PX-01 Cube technology provides a crucial layer of safety for your facility. By adhering to a well-defined policy, your organization can ensure the protection of both personnel and infrastructure while maintaining preparedness for seismic events.

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This example policy demonstrates how you can structure your own implementation for the P-ALERT and PX-01 Cube combination. Adapt it to your facility’s specific needs, and take advantage of the timely warnings these technologies provide to mitigate earthquake risks effectively.

Seeing is Believing – Contact us today to schedule a demonstration of our state-of-the-art earthquake early warning solutions.

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About QuakeLogic

QuakeLogic is a leading provider of advanced earthquake early warning systems, seismic monitoring solutions, offering a range of products and services designed to enhance the accuracy and efficiency of testing, data acquisition, and analysis.

Contact Information:

• Email: sales@quakelogic.net
• Phone: +1-916-899-0391
• WhatsApp: +1-650-353-8627
• Website: https://quakelogic.net/earthquake-early-warning-products

For more information about our products and services, please visit our website or contact our sales team. We are here to help you with all your testing and monitoring needs.